Next Article in Journal
Anti-Citrullinated Protein Antibody Titers Are Independently Modulated by Both Disease Activity and Conventional or Biologic Anti-Rheumatic Drugs
Previous Article in Journal
Repeatability and Reproducibility of Retinal Fractal Dimension Measured with Swept-Source Optical Coherence Tomography Angiography in Healthy Eyes: A Proof-of-Concept Study
Previous Article in Special Issue
Genotype Triad for HOTAIR rs10783618, LINC-ROR rs1942347, and MALAT1 rs3200401 as Molecular Markers in Systemic Lupus Erythematous
 
 
Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
Journals
Diagnostics
Volume 12
Issue 7
10.3390/diagnostics12071772
diagnostics-logo
Submit to this Journal Review for this Journal Propose a Special Issue
► Article Menu

Article Menu

share Share announcement Help format_quote Cite question_answer Discuss in SciProfiles
first_page
settings
Order Article Reprints
Font Type:
Arial Georgia Verdana
Font Size:
Aa Aa Aa
Line Spacing:
Column Width:
Background:
Review

Autoimmune Connective Tissue Diseases-Related Pruritus: Proper Diagnosis and Possible Mechanisms

by
Lai-San Wong
1 and
Yu-Ta Yen
2,3,*
1
Department of Dermatology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung 83301, Taiwan
2
Department of Dermatology, Fooying University Hospital, Pentong 928, Taiwan
3
Institute of Biomedical Sciences, National Sun Yat-Sen University, Kaohsiung 80420, Taiwan
*
Author to whom correspondence should be addressed.
Diagnostics 2022, 12(7), 1772; https://doi.org/10.3390/diagnostics12071772
Submission received: 13 June 2022 / Revised: 5 July 2022 / Accepted: 20 July 2022 / Published: 21 July 2022
(This article belongs to the Special Issue Advances in the Diagnosis and Management of Rheumatic Diseases)
Browse Figure
Review Reports Versions Notes

Abstract

:
Pruritus is a well-known bothersome symptom among skin disorders, especially inflammatory skin disorders. Lately, a high prevalence of pruritus in patients with autoimmune connective tissue diseases (ACTDs) has been revealed. Patients with ACTDs may suffer from varying degrees of pruritus, which affect their quality of life. However, it is rarely recognized both by patients and physicians. Meanwhile, pruritus is not only a symptom but is also related to the disease severity of some ACTDs. The pathophysiology of ACTD related pruritus is ambiguous. This review summarizes the features and possible mechanisms of ACTD-related pruritus, which might lead to proper diagnosis and treatment.

1. Introduction

Pruritus is a bothersome and common symptom in dermatology. The mechanisms of pruritus are complicated and it emerge from numerous systemic disorders, including dermatologic, neurologic, systemic, psychiatric, and a combination of the above systems. Great advances have been made recently in research into the mechanisms of pruritus and its pathophysiology in inflammatory disorders such as atopic dermatitis and psoriasis [1,2]. However, pruritus in autoimmune connective tissue diseases (ACTDs) is easily neglected and under-recognized by both patients and physicians due to relatively obscure skin changes and unspecific itch patterns. As a matter of fact, pruritus is not rare in patients with ACTDs and 57% of patients with ACTDs complained of pruritus in the initial visit [3]. Importantly, pruritus is sometimes severe and impairs quality of life and mental health [4,5]. In this review, we summarize the prevalence, possible mechanisms (Figure 1), features, and potential treatments in ACTD-related pruritus. This might lead to a proper diagnosis in ACTD patients presenting with pruritus and provide an early diagnosis in certain types of ACTD.

2. Dermatomyositis (DM)

2.1. Prevalence and Characteristics of Pruritus

DM is an uncommon autoimmune disease involving both the skin and muscle [6]. It is one of the most well-recognized ACTDs presenting with pruritus [7]. The prevalence of pruritus in patients with DM was variable, from more than 50% to higher than 90%, among different studies [8,9,10,11]. The degree of pruritus in patients with DM is often severe and one study of 191 patients demonstrated that more than half of the patients with DM experienced moderate to severe pruritus defined by visual analogue scale (VAS) scores of 3.6–10 [11], which is consistent with previous studies [8,9]. There was no difference in VAS scores between classic DM and clinically amyopathic DM [11]. It has also been found that the degree of pruritus was correlated with the severity of skin disease activities (cutaneous dermatitis area and severity index (CDASI)) and quality of life [9,11]. Importantly, pruritus is the most common initial symptom among the manifestations of DM [10] and it has been reported that DM shows a significantly higher pruritus score than in patients with cutaneous lupus erythematosus (CLE) (VAS scores in DM: 3.8 versus CLE: 2.0) [9]. Therefore, it was suggested that intense pruritus might distinguish clinically similar DM from CLE [9,10].

2.2. Mechanisms and Treatments

The pathophysiology of pruritus in DM is unknown. Interleukin (IL)-31, a crucial T-helper-2 (Th2) cytokine participating in the pathogenesis of a variety of pruritic skin disorders [12,13], has been reported to be involved in DM-related pruritus [11]. Enhanced expression of IL-31 and IL-31 receptor A in itchy lesional DM skin compared to nonlesional skin and healthy control skin was revealed [11]. Meanwhile, the level of IL-31 mRNA in lesional skin was correlated with the VAS scores [11]. A reduction of intraepidermal nerve fibers (IENF) without changes in the pepti-dergic nerve fibers was reported in a DM patient who presented with recalcitrant pruritus on the skin of the scalp [14], indicating the possible involvement of small-fiber neuropathy in the pathophysiology of DM-related pruritus. Small-fiber neuropathy caused by damage to the peripheral nervous system of myelinated Aδ-fibers and unmyelinated C-fibers [15] is one of the conditions causing neuropathic itch, which occurs due to injury of neurons of the peripheral or central nervous system [16]. Neuropathic itch has been demonstrated to play a role in a range of itchy disorders [17] and DM-associated sensory neuropathy [18], suggesting that peripheral nerve damage in the inflammatory course of DM may contribute to the mechanism of DM-related pruritus. However, further large studies are required into the association of small-fiber neuropathy and DM-related pruritus.
Accordingly, targeting IL-31 is a potential therapy for DM-related pruritus. Nemolizumab, an IL-31 receptor A inhibitor, has shown promising effects in atopic dermatitis with pruritus in a phase 3 clinical trial [19]. BMS-98116, a humanized IL-31 antibody, and vixarelimab (KPL-716) targeting the OSMR β chain of IL-31 receptor might also be efficacious treatments. Lenabasum (JBT-101, anabasum), a selective cannabinoid receptor type 2 agonist, downregulated the expression of IL-31 from CpG stimulated peripheral blood mononuclear cells in an in vitro study, suggesting a possible role in treatment of DM-related pruritus [11]. Recently, a phase 2 study showed lenabasum improved skin symptoms with a reduction in the scores of CDASI [20]. Though the degree of pruritus was not evaluated in that trial, treatment with lenabasum might be efficacious for DM-related pruritus. A phase 3 trial assessing the efficacy and safety of lenabasum for the treatment of DM is ongoing (NCT03813160). Treatments targeting reduction of the inflammatory process is reasonable in DM-related pruritus. Tacrolimus, a calcineurin inhibitor, has been shown to be effective for the management of pruritus in patients with DM [10]. A patient with recalcitrant cutaneous DM and severe scalp pruritus was responsive to apremilast, an inhibitor of phosphodiesterase 4 specific for cyclic adenosine monophosphate [21]. More clinical trials are necessary for evaluation of the specific roles of the inflammatory components.

3. Cutaneous Lupus Erythematosus (CLE)

3.1. Prevelance and Characteristics of Pruritus

Pruritus in patients with CLE was considered to be insignificant, especially compared with DM [9]. However, recent studies had inconsistent results. One study of 42 patients reported median pruritus VAS scores were 6 and 4 in patients with specific and non-specific CLE skin lesions, respectively. Though the degree of pruritus was no different between groups of CLE, LE nonspecific lesions, or a combination of both, a correlation between pruritus and CLE disease area and severity index (CLASI) scores was found in the group of specific CLE skin lesions. That study also demonstrated that pain, but not pruritus, was correlated to quality of life [22]. Another multicenter multinational cross-sectional study of 567 patients, which included CLE specific skin lesions, showed that 75% of patients experienced pruritus. Most of the patients (62.1%) with CLE had mild itching (numerical rating scale (NRS) score 1–3). Subjects with acute CLE were most frequently reported to have itch, followed by chronic CLE and subacute CLE. Among the subtypes of chronic CLE, hypertrophic CLE had the highest pruritus intensity (NRS 5.3 ± 3 points) while LE profundus had the lowest pruritus intensity (NRS 1.9 ± 2.7 points). Inconsistent with the aforementioned study, a correlation was revealed between the intensity of pruritus and the severity of skin lesions [23]. Recently, Samotij et al., revealed that 76.8% (116/153) of patients with CLE experienced pruritus and more than half had moderate or severe pruritus (NRS above 4 points). Importantly, they showed that pruritus was not only correlated to skin activities but also systemic LE (SLE) activities [24]. Samotij et al., also found that the most commonly affected itching area was the scalp, followed by the face (excluding the ears and nose) and the arms. The majority of patients experienced pruritus on a daily basis, associated with a burning and tickling sensation [24]. Accordingly, pruritus might have more prominent impacts on patients with CLE than thought. It is necessary to pursue further investigation into the degree of pruritus and the association of pruritus with SLE activities.

3.2. Mechanisms and Treatments

The pathogenesis of LE is largely unknown. Small fiber damage and decreased IENF density (IENFD) were found in patients with SLE [25]. Neuropathic itch as an initial presentation in a patient with lupus transverse myelitis has been reported [26]. This indicates that neuropathic itch might participate in the pathogenesis of CLE-related pruritus. Other itch mediators such as IL-6, IL-33, and IL-31 may be involved in the mechanism of CLE-related pruritus. IL-6 was related to the pruritus transduction in prurigo nodularis [27] and calcium phosphate-induced pruritus [28]. Increased expression of IL-6 in the skin of patients with SLE was found [25]. On the other hand, IL-6 can activate IL4+ CD4+ T cells [29], which may indirectly activate downstream itch pathways. Lately, polymorphism of IL-31 [30] and IL-33 [31] was shown to be associated with the risk of SLE. In addition, enhanced serum level of IL-31 in patients with SLE has been reported [32]. IL-33 and IL-31 are pivotal pruritogens in atopic dermatitis, the prototype of inflammatory skin disorder [33]. It is worth specifying the role of these cytokines in the pathogenesis of CLE-related pruritus.
Since little is known about the mechanisms of pruritus in CLE, treatment is mainly based on immunosuppression for LE. Diminishing the inflammation by topical corticosteroid, calcineurin inhibitors, or systemic administration of methotrexate and azathioprine may be considered for CLE-related pruritus. Hydroxychloroquine, one of the mainstay treatments for LE, might induce pruritus [34]. Hydroxychloroquine-induced pruritus is less common and less severe than chloroquine, which induced itch by binding to the Mas-related G protein-coupled receptor (Mrgpr A3/Mrgpr X1) in the periphery and via gastrin-related peptide in the central nervous system [35]. Therefore, it should be taken note of when itching is present in LE patients treated with hydroxychloroquine.

4. Systemic Sclerosis (SSc)

4.1. Prevalence and Charateristics of Pruritus

SSc is a rare and complex ACTD, which targets connective tissue-producing cells, vascular structures, and the immune system [36]. Skin signs are the earliest and relatively most easily approached manifestations [37]. Itching has been reported as the ninth most frequently experienced and the 31st impacted symptom among 69 symptoms evaluated in a Canadian survey of 856 patients with SSc [38]. It showed that the onset of pruritus was more likely 1.0 to 1.9 years from disease onset [39]. The prevalence of pruritus in patients with SSc varies ranging from more than 40% [40,41], 56.7% [42] and more than 60% [38,43,44] in different studies. This suggests pruritus is a notable feature in patients with SSc. In a questionnaire study of 61 patients, the intensity of pruritus in average was 4.4 ±1.8 with a maximum of 7.1 ± 1.9 measured by VAS scores, indicating the high severity of pruritus in patients with SSc [43]. A substantially stable and persistent itch pattern accompanied by numbness, pain, and burning sensation was described [41,43]. The most commonly affected area was the head and followed by the back and dorsal hands [43]. However, Stull et al., reported that the back was the most common itchy location followed by the arms and scalp [42]. A high impact of pruritus on quality of life with worse mental and physical function, fatigue, and greater disability was found in patients with SSc compared to patients without pruritus [40,45]. In addition to gastrointestinal system involvement and pain, SSc patients with pruritus were significantly associated with sleep disturbance [46]. Intriguingly, Racine et al., showed that the effect of pain severity on sleep and physical function diminished as itch severity increased in patients with SSc [45]. This illustrates the possible interaction between pain and itch pathways [47]. Furthermore, a correlation between pruritus and systemic involvement was reported. A post hoc analysis revealed that SSc patients with pruritus had more skin involvement, gastrointestinal symptoms, worse breathing problems, worse Raynaud’s symptoms, and more severe finger ulcers in a cross-sectional multicenter study of 400 patients [39]. A study of 959 patients from the Canadian Scleroderma Research Group Registry showed that the presence of pruritus was associated with greater skin involvement (p = 0.017) and there was a correlation of pruritus between skin severity activities and gastrointestinal system involvement in patients with SSc [41]. However, a cross-sectional survey of 60 patients showed no significant association between pruritus and systemic manifestations of SSc, including interstitial lung disease, pulmonary hypertension, renal involvement, gastrointestinal involvement, or joint pain [42]. More investigations are necessary into the association between pruritus and systemic involvement of SSc.

4.2. Mechanisms and Treatments

The pathophysiology of SSc is unclear. Stull et al., reported that there was no association with pruritus and the presence of autoantibodies including anti-nuclear antibodies, anti-double-stranded DNA antibodies, anti-topoisomerase I antibodies, anti-centromere antibodies (ACA), anti-RNA polymerase III antibodies, and anti-U3 RNP [42]. However, Gourier et al., demonstrated that the ACA-positive subgroup had pruritus predominantly in the non-sclerotic areas (82.4%), a longer duration of SSs disease and pruritus, and a higher proportion of patients had preexisted pruritus before the appearance of SSc (17.6% vs. 0%) compared to the ACA-negative subgroup [44]. This indicates a possible immunological component in the mechanism of pruritus in SSc. Rituximab, an anti-CD20 monoclonal antibody, showed improvement in pruritus in 6 out of 8 patients with SSc [48]. In that study, IL-6, IL-15, IL-23, and IL-17 were abnormally increased in three patients and these cytokines were reduced after Rituximab treatment [48]. Further studies are required into the possible role of these cytokines in the pathophysiology of SSc-related pruritus.
There is currently no specified therapy for pruritus in patients with SSc. Since pruritus is significantly associated with xerosis in patients with SSc [42], it is essential to have an emollient as a general principle in daily practice. The British Society for Rheumatology and British Health Professionals in Rheumatology guidelines recommend lanolin-based moisturizer and antihistamine for itch management in patients with SSc [49]. Opioid signaling plays a part in itch perception by modulation of neuronal sensation [50]. Three patients with SSc showed improvement in pruritus and gastrointestinal symptoms with low-dose naltrexone, a mu-opioid receptor antagonist [51]. This indicates the possible involvement of the opioid system in SSc-related pruritus. Enhanced IL-6/JAK/STAT signaling and tofacitinib, a JAK1/3 inhibitor, gene signature were found in skin and lung biopsies from patients with SSc [52]. Meanwhile, tofacitinib improved both the skin and lung fibrosis in a bleomycin-induced scleroderma mouse model [52]. Lately, a pivotal role of the JAK pathway for itch transduction has been revealed [2]. JAK/STAT signaling is responsible for part of the downstream effect of pruritogenic cytokines such as IL-4 and IL-31 [13,53]. Meanwhile, disruption of JAK1 signaling in sensory neurons reduced chronic itch in mice [54]. Ju et al., reported that a significant reduction in itch scores of 3.34 (±3.34) in non-atopic dermatitis chronic itch with 2% topical tofacitinib [55]. The above evidence suggests JAK inhibitors might be a promising treatment for both systemic symptoms and pruritus of SSc.

5. Morphea

5.1. Prevalance and Characteristics of Pruritus

Morphea, also known as localized scleroderma, is an inflammatory autoimmune disorder characterized by skin and soft tissue sclerosis [56]. Scarce information is available about the prevalence and pattern of pruritus in morphea. Though pruritus was not specifically evaluated, a study of 101 patients showed itch or pain, noted in 46% of patients with morphea [5]. Another study revealed that more than half of patients with morphea (21 of 40, 52.5%) had skin pain, itchiness, tightness, or burning sensations in the affected area and the subjective symptoms were more obvious over the high activity localized lesions [57]. A cross-sectional survey study of 322 patients with morphea showed that itch VAS scores were 3.96 ± 3.17 and 3.42 ± 2.17 in adults and children, respectively [4]. The severity of pruritus in morphea is less intense compared to the other ACTDs mentioned above, but pruritus is one of the most commonly reported symptoms along with pain, numbness, and tingling [5]. Das et al., demonstrated that itching and pain but not fatigue affect the quality of life, along with numbness and tightness, in patients with morphea [4]. Consistent with the above study, Lis-Święty et al., also showed subjective symptoms including itching, pain, tightness, and burning sensation significantly impair health-related quality of life [58]. Additionally, Krof et al., illustrated that itch, pain, and fatigue also impacted on psychological functioning and itch was related to depressed mood in patients with morphea [59]. Generalized morphea had the highest psychological distress compared with linear and plaque types [59]. Moreover, Das et al., revealed a significant correlation between pruritus and lesion activity [4].

5.2. Mechanisms and Treatments

There are limited studies on the pathophysiology of pruritus in morphea. Therefore treatment mainly targets anti-inflammation for morphea itself. Phototherapy is one of the most well-studied therapies in treatment of morphea [60]. A case series revealed initial response for itching measured by VAS scores with narrowband ultraviolet B (UVB) at 5 to 9 sessions in different types of morphea [61]. However, only medium-dose UVA1 demonstrated significantly improved itching compared with low-dose UVA1 and narrowband UVB phototherapy in a randomized control study [62]. The anti-pruritic effect of phototherapy is complicated. UV-light might modulate the cutaneous sensory nervous system for pruriception directly or function on skin immune cells indirectly, which further reduces the release of pruritogenic mediators [63]. For the possible role of inflammatory components in the pathogenesis of morphea-related pruritus, less itchiness was reported with abatacept, an inhibitor of T cell activation, in a patient with morphea profunda [64].

6. Sjögren Syndrome (SS)

6.1. Prevalence and Characteristics of Pruritus

SS is an autoimmune disease characterized by dysfunction of salivary and lacrimal glands. It can be defined as primary SS when it occurs alone or secondary SS if systemic autoimmune diseases accompany [65]. Extra-glandular involvement is common, especially dermatological involvement. An Italian retrospective study of 93 patients showed that pruritus was found in 41.6% and 38.3% of primary and secondary SS, respectively [66]. In that study, pruritus was the second most frequent cutaneous manifestation following xerosis, which was more frequently noted in primary SS than secondary SS (56.4% versus 25.8%) [66]. Another study of 19 patients showed that 53% of patients with primary SS experienced pruritus and the mean duration of pruritus was 74.4 months. The intensity of pruritus was 7.7 ± 1.7 measured by VAS scores and the severity of pruritus had a significant correlation with quality of life. The most affected location was the shins, followed by the back and forearms [67]. Furthermore, xerosis was the most common aggravating factor for pruritus in primary SS and 90% of pruritic patients also suffered from xerosis while only 44% did in the non-itchy group [67], indicating the influence of xerosis on itchy sensation.

6.2. Mechanisms and Treatments

The mechanisms of pruritus in SS remain elusive and might be multifactorial. Xerosis, the most common symptom in SS, might contribute to or at least aggravate pruritus in SS. Nevertheless, the pathogenesis of xerosis in SS is controversial. It is suggested that xerosis in SS was caused by dysfunction of sweat glands by lymphocytes-mediated injury [68], but Bernacchi et al., reported that there was no sweat glands impairment, but there were biochemical alterations of the epidermis with increased epidermal proliferation and perturbation of epidermal differentiation in patients with SS [69]. Further investigations of the possible mechanisms of xerosis and the relationship between xerosis and pruritus in SS are necessary. Peripheral nervous system involvement with sensory neuropathy in SS is common [65,70]. Small-fiber neuropathy has been demonstrated in primary SS and higher neuropathic symptom burden compared to other well-known small-fiber neuropathy etiologies, hereditary transthyretin amyloidosis and idiopathic small-fiber neuropathy [71]. Therefore neuropathic itch may be involved in pruritus of patients with SS [17]. Due to the unclear pathogenesis of pruritus in SS, specialized pruritus therapy is sparse. Moisturizer as general skin care, to avoid xerosis and additional scratching, is required. For the possible role of neuropathic itch in the pathogenesis of SS, neuro-modulating agents, such as gabapentin and pregabalin might be considered [72].
Of note, a meta-analysis of 14 studies reported an increased risk of malignancies, non-Hodgkin lymphoma, and thyroid cancer in patients with primary SS [73]. Another large cohort study of 1300 patients revealed B cell lymphoma is the most frequently associated cancer with primary SS [74]. Paraneoplastic pruritus, especially lymphoma and leukemia, is one of the important etiologies of idiopathic generalized pruritus [75]. Although pruritus is less common in non-Hodgkin lymphoma than in Hodgkin lymphoma, 15% of patients with non-Hodgkin lymphoma experienced generalized itching [76]. A detailed survey of occult neoplasia, especially hematological malignancies, is required when unexplainable pruritus occurs in patients with stable disease activity of SS.

7. Conclusions

Pruritus is a frequent presentation in ACTDs and physicians should pay attention to this prominent symptom. Comprehensive medical history and physical examination are essential to disclose the characteristic signs and symptoms of pruritus in patients with ACTDs. A good understanding of the features and pattern of pruritus in ACTDs may avoid delayed diagnosis and misleading diagnosis of inflammatory or allergic diseases. Pruritus in some types of ACTDs not only affects quality of life but is also associated with skin disease activities, such as DM and CLE. Current evidence provides more insights into the possible pathophysiology and therapies in various types of ACTDs (Table 1), but there is still a knowledge gap regarding a more specific molecular pathway in ACTDs-related pruritus. Extensive studies into the different features of pruritus in various subtypes of each ACTD are also important. As the mechanisms of ACTD-related pruritus are generally unknown, specialized treatment is insufficient. More investigations are warranted to develop advance targeting therapies for this distressing symptom in ACTDs.

Author Contributions

Conceptualization, Y.-T.Y. and L.-S.W.; writing—original draft preparation, L.-S.W.; writing—review and editing, Y.-T.Y. and L.-S.W. All authors have read and agreed to the published version of the manuscript.

Funding

This research was funded by grants from the Chang Gung Medical Research Program (CMRPG8L0831) of Taiwan.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Acknowledgments

We acknowledge the grant support from the Chang Gung Medical Research Program (CMRPG8L0831).

Conflicts of Interest

The authors declare no conflict of interest.

References

  1. Kahremany, S.; Hofmann, L.; Gruzman, A.; Cohen, G. Advances in understanding the initial steps of pruritoceptive itch: How the itch hits the switch. Int. J. Mol. Sci. 2020, 21, 4883. [Google Scholar] [CrossRef] [PubMed]
  2. Fowler, E.; Yosipovitch, G. A new generation of treatments for itch. Acta Derm. Venereol. 2020, 100, 37–45. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  3. Argobi, Y.; Smith, G.P. Characterizing pruritus in autoimmune connective tissue diseases. J. Drugs. Dermatol. 2019, 18, 995–998. [Google Scholar]
  4. Das, S.; Bernstein, I.; Jacobe, H. Correlates of self-reported quality of life in adults and children with morphea. J. Am. Acad. Dermatol. 2014, 70, 904–910. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  5. Bali, G.; Kárpáti, S.; Sárdy, M.; Brodszky, V.; Hidvégi, B.; Rencz, F. Association between quality of life and clinical characteristics in patients with morphea. Qual. Life Res. 2018, 27, 2525–2532. [Google Scholar] [CrossRef] [PubMed]
  6. DeWane, M.E.; Waldman, R.; Lu, J. Dermatomyositis: Clinical features and pathogenesis. J. Am. Acad. Dermatol. 2020, 82, 267–281. [Google Scholar] [CrossRef] [PubMed]
  7. Kim, H.J. Pruritus in autoimmune connective tissue diseases. Ann. Transl. Med. 2021, 9, 441. [Google Scholar] [CrossRef]
  8. Shirani, Z.; Kucenic, M.; Carroll, C.; Fleischer, A., Jr.; Feldman, S.; Yosipovitch, G.; Jorizzo, J. Pruritus in adult dermatomyositis. Clin. Exp. Dermatol. 2004, 29, 273–276. [Google Scholar] [CrossRef]
  9. Goreshi, R.; Chock, M.; Foering, K.; Feng, R.; Okawa, J.; Rose, M.; Fiorentino, D.; Werth, V. Quality of life in dermatomyositis. J. Am. Acad. Dermatol. 2011, 65, 1107–1116. [Google Scholar] [CrossRef] [Green Version]
  10. Yosipovitch, G.; Tan, A.; LoSicco, K.; Manabat, C.G.; Kannagra, A.; Carroll, C.; Chan, Y.H.; Ng, P.; Jorizzo, J. A comparative study of clinical characteristics, work-up, treatment, and association to malignancy in dermatomyositis between two tertiary skin centers in the USA and singapore. Int. J. Dermatol. 2013, 52, 813–819. [Google Scholar] [CrossRef]
  11. Kim, H.J.; Zeidi, M.; Bonciani, D.; Pena, S.M.; Tiao, J.; Sahu, S.; Werth, V.P. Itch in dermatomyositis: The role of increased skin interleukin-31. Br. J. Dermatol. 2018, 179, 669–678. [Google Scholar] [CrossRef] [PubMed]
  12. Kabashima, K.; Irie, H. Interleukin-31 as a clinical target for pruritus treatment. Front. Med. 2021, 8, 638325. [Google Scholar] [CrossRef] [PubMed]
  13. Datsi, A.; Steinhoff, M.; Ahmad, F.; Alam, M.; Buddenkotte, J. Interleukin-31: The “itchy” cytokine in inflammation and therapy. Allergy 2021, 76, 2982–2997. [Google Scholar] [CrossRef] [PubMed]
  14. Hurliman, E.; Groth, D.; Wendelschafer-Crabb, G.; Kennedy, W.; Kavand, S.; Ericson, M.; Hordinsky, M. Small-fibre neuropathy in a patient with dermatomyositis and severe scalp pruritus. Br. J. Dermatol. 2016, 176, 209–211. [Google Scholar] [CrossRef] [Green Version]
  15. Raasing, L.R.M.; Vogels, O.J.M.; Veltkamp, M.; van Swol, C.F.P.; Grutters, J.C. Current view of diagnosing small fiber neuropathy. J. Neuromuscul. Dis. 2021, 8, 185–207. [Google Scholar] [CrossRef]
  16. Ständer, S.; Weisshaar, E.; Mettang, T.; Szepietowski, J.C.; Carstens, E.; Ikoma, A.; Bergasa, N.V.; Gieler, U.; Misery, L.; Wallengren, J.; et al. Clinical classification of itch: A position paper of the international forum for the study of itch. Acta Derm. Venereol. 2007, 87, 291–294. [Google Scholar] [CrossRef] [Green Version]
  17. Pereira, M.P.; Wiegmann, H.; Agelopoulos, K.; Ständer, S. Neuropathic itch: Routes to clinical diagnosis. Front. Med. 2021, 8, 641746. [Google Scholar] [CrossRef]
  18. Nguyen, T.P.; Bangert, C.; Biliciler, S.; Athar, P.; Sheikh, K. Dermatomyositis-associated sensory neuropathy: A unifying pathogenic hypothesis. J. Clin. Neuromuscul. Dis. 2014, 16, 7–11. [Google Scholar] [CrossRef]
  19. Kabashima, K.; Matsumura, T.; Komazaki, H.; Kawashima, M. Trial of nemolizumab and topical agents for atopic dermatitis with pruritus. N. Engl. J. Med. 2020, 383, 141–150. [Google Scholar] [CrossRef]
  20. Werth, V.P.; Hejazi, E.; Pena, S.M.; Haber, J.; Zeidi, M.; Reddy, N.; Okawa, J.; Feng, R.; Bashir, M.M.; Gebre, K.; et al. Safety and efficacy of lenabasum, a cannabinoid receptor type 2 agonist, in dermatomyositis patients with refractory skin disease a randomized clinical trial. J. Investig. Dermatol. 2022; online ahead of print. [Google Scholar] [CrossRef]
  21. Charlton, D.; Moghadam-Kia, S.; Smith, K.; Aggarwal, R.; English, J.R.; Oddis, C. Refractory cutaneous dermatomyositis with severe scalp pruritus responsive to apremilast. J. Clin. Rheumatol. 2021, 27, S561–S562. [Google Scholar] [CrossRef]
  22. Méndez-Flores, S.; Orozco-Topete, R.; Bermúdez-Bermejo, P.; Hernández-Molina, G. Pain and pruritus in cutaneous lupus: Their association with dermatologic quality of life and disease activity. Clin. Exp. Rheumatol. 2013, 31, 940–942. [Google Scholar] [PubMed]
  23. Samotij, D.; Szczęch, J.; Kushner, C.J.; Mowla, M.R.; Dańczak-Pazdrowska, A.; Antiga, E.; Chasset, F.; Furukawa, F.; Hasegawa, M.; Hashizume, H.; et al. Prevalence of pruritus in cutaneous lupus erythematosus: Brief report of a multicenter, multinational cross-sectional study. BioMed Res. Int. 2018, 2018, 1–5. [Google Scholar] [CrossRef] [Green Version]
  24. Samotij, D.; Szczęch, J.; Antiga, E.; Bonciani, D.; Caproni, M.; Chasset, F.; Dańczak-Pazdrowska, A.; Furukawa, F.; Hasegawa, M.; Hashizume, H.; et al. Clinical characteristics of itch in cutaneous lupus erythematosus: A prospective, multicenter, multinational, cross-sectional study. Lupus 2021, 30, 1385–1393. [Google Scholar] [CrossRef]
  25. Tekatas, A.; Tekatas, D.D.; Solmaz, V.; Karaca, T.; Pamuk, O.N. Small fiber neuropathy and related factors in patients with systemic lupus erythematosus; the results of cutaneous silent period and skin biopsy. Adv. Rheumatol. 2020, 60, 31. [Google Scholar] [CrossRef]
  26. González Sánchez, M.; Llorente Ayuso, L.; Ruiz Morales, J.; Martínez Salio, A. Neuropathic pruritus as the presenting symptom of lupus transverse myelitis. J. Neurol. Sci. 2016, 368, 138–139. [Google Scholar] [CrossRef] [PubMed]
  27. Konda, D.; Chandrashekar, L.; Rajappa, M.; Kattimani, S.; Thappa, D.M.; Ananthanarayanan, P.H. Serotonin and interleukin-6: Association with pruritus severity, sleep quality and depression severity in prurigo nodularis. Asian J. Psychiatry 2015, 17, 24–28. [Google Scholar] [CrossRef] [PubMed]
  28. Keshari, S.; Sipayung, A.D.; Hsieh, C.C.; Su, L.J.; Chiang, Y.R.; Chang, H.C.; Yang, W.C.; Chuang, T.H.; Chen, C.L.; Huang, C.M. IL-6/p-BTK/p-ERK signaling mediates calcium phosphate-induced pruritus. FASEB J. 2019, 33, 12036–12046. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  29. Rincón, M.; Anguita, J.; Nakamura, T.; Fikrig, E.; Flavell, R.A. Interleukin (IL)-6 directs the differentiation of IL-4-producing CD4+ T cells. J. Exp. Med. 1997, 185, 461–469. [Google Scholar] [CrossRef] [Green Version]
  30. Huang, H.-T.; Chen, J.-M.; Guo, J.; Lan, Y.; Wei, Y.-S. The association of interleukin-31 polymorphisms with interleukin-31 serum levels and risk of systemic lupus erythematosus. Rheumatol. Int. 2016, 36, 799–805. [Google Scholar] [CrossRef]
  31. Guo, J.; Xiang, Y.; Peng, Y.-F.; Huang, H.-T.; Lan, Y.; Wei, Y.-S. The association of novel IL-33 polymorphisms with sIL-33 and risk of systemic lupus erythematosus. Mol. Immunol. 2016, 77, 1–7. [Google Scholar] [CrossRef] [PubMed]
  32. Zhang, M.; Xu, W.D.; Zhu, Y.; Wen, P.F.; Leng, R.X.; Pan, H.F.; Ye, D.Q. Serum levels of cytokines in systemic lupus erythematosus. Z. Fur Rheumatol. 2013, 73, 277–280. [Google Scholar] [CrossRef] [PubMed]
  33. Wong, L.-S.; Yen, Y.-T.; Lee, C.-H. The implications of pruritogens in the pathogenesis of atopic dermatitis. Int. J. Mol. Sci. 2021, 22, 7227. [Google Scholar] [CrossRef] [PubMed]
  34. Holme, S.A.; Holmes, S.C. Hydroxychloroquine-induced pruritus. Acta Derm. Venereol. 1999, 79, 333. [Google Scholar] [PubMed] [Green Version]
  35. Ajayi, A.A.L. Itching, chloroquine, and malaria: A review of recent molecular and neuroscience advances and their contribution to mechanistic understanding and therapeutics of chronic non-histaminergic pruritus. Int. J. Dermatol. 2018, 58, 880–891. [Google Scholar] [CrossRef] [PubMed]
  36. Pattanaik, D.; Brown, M.; Postlethwaite, B.C.; Postlethwaite, A.E. Pathogenesis of systemic sclerosis. Front. Immunol. 2015, 6, 272. [Google Scholar] [CrossRef] [Green Version]
  37. Pearson, D.R.; Werth, V.P.; Pappas-Taffer, L. Systemic sclerosis: Current concepts of skin and systemic manifestations. Clin. Dermatol. 2018, 36, 459–474. [Google Scholar] [CrossRef]
  38. Bassel, M.; Hudson, M.; Taillefer, S.S.; Schieir, O.; Baron, M.; Thombs, B.D. Frequency and impact of symptoms experienced by patients with systemic sclerosis: Results from a canadian national survey. Rheumatology 2010, 50, 762–767. [Google Scholar] [CrossRef] [Green Version]
  39. Razykov, I.; Thombs, B.D.; Hudson, M.; Bassel, M.; Baron, M. Prevalence and clinical correlates of pruritus in patients with systemic sclerosis. Arthritis Rheumatol. 2009, 61, 1765–1770. [Google Scholar] [CrossRef]
  40. El-Baalbaki, G.; Razykov, I.; Hudson, M.; Bassel, M.; Baron, M.; Thombs, B.D. Association of pruritus with quality of life and disability in systemic sclerosis. Arthritis Care Res. 2010, 62, 1489–1495. [Google Scholar] [CrossRef]
  41. Razykov, I.; Levis, B.; Hudson, M.; Baron, M.; Thombs, B.D. Prevalence and clinical correlates of pruritus in patients with systemic sclerosis: An updated analysis of 959 patients. Rheumatology 2013, 52, 2056–2061. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  42. Stull, C.; Weaver, L.; Valdes-Rodriguez, R.; Naramala, S.; Lavery, M.; Chan, Y.; Mendoza, F.; Yosipovitch, G. Characteristics of chronic itch in systemic sclerosis: A cross-sectional survey. Acta Derm. Venereol. 2018, 98, 793–794. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  43. Théréné, C.; Brenaut, E.; Sonbol, H.; Pasquier, E.; Saraux, A.; Devauchelle, V.; Le Moigne, E.; Misery, L.; Abasq-Thomas, C. Itch and systemic sclerosis: Frequency, clinical characteristics and consequences. Br. J. Dermatol. 2017, 176, 1392–1393. [Google Scholar] [CrossRef] [PubMed]
  44. Gourier, G.; Théréné, C.; Mazeas, M.; Abasq-Thomas, C.; Brenaut, E.; Huet, F.; Sonbol, H.; Campillo, E.; Lemerle, J.; Pasquier, E.; et al. Clinical characteristics of pruritus in systemic sclerosis vary according to the autoimmune subtype. Acta Derm. Venereol. 2018, 98, 735–741. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  45. Racine, M.; Hudson, M.; Baron, M.; Nielson, W.R.; Pope, J.; Markland, J.; Robinson, D.; Jones, N.; Khalidi, N.; Docherty, P.; et al. The impact of pain and itch on functioning and health-related quality of life in systemic sclerosis: An exploratory study. J. Pain Symptom Manag. 2016, 52, 43–53. [Google Scholar] [CrossRef] [Green Version]
  46. Milette, K.; Hudson, M.; Korner, A.; Baron, M.; Thombs, B.D. Sleep disturbances in systemic sclerosis: Evidence for the role of gastrointestinal symptoms, pain and pruritus. Rheumatology 2013, 52, 1715–1720. [Google Scholar] [CrossRef] [Green Version]
  47. Anzelc, M.; Burkhart, C.G. Pain and pruritus: A study of their similarities and differences. Int. J. Dermatol. 2019, 59, 159–164. [Google Scholar] [CrossRef]
  48. Giuggioli, D.; Lumetti, F.; Colaci, M.; Fallahi, P.; Antonelli, A.; Ferri, C. Rituximab in the treatment of patients with systemic sclerosis. Our experience and review of the literature. Autoimmun. Rev. 2015, 14, 1072–1078. [Google Scholar] [CrossRef]
  49. Denton, C.P.; Hughes, M.; Gak, N.; Vila, J.; Buch, M.H.; Chakravarty, K.; Fligelstone, K.; Gompels, L.L.; Griffiths, B.; Herrick, A.L.; et al. BSR and BHPR guideline for the treatment of systemic sclerosis. Rheumatology 2016, 55, 1906–1910. [Google Scholar] [CrossRef] [Green Version]
  50. Nguyen, E.; Lim, G.; Ross, S.E. Evaluation of therapies for peripheral and neuraxial opioid-induced pruritus based on molecular and cellular discoveries. Anesthesiology 2021, 135, 350–365. [Google Scholar] [CrossRef]
  51. Frech, T.; Novak, K.; Revelo, M.P.; Murtaugh, M.; Markewitz, B.; Hatton, N.; Scholand, M.B.; Frech, E.; Markewitz, D.; Sawitzke, A.D. Low-dose naltrexone for pruritus in systemic sclerosis. Int. J. Rheumatol. 2011, 2011, 1–5. [Google Scholar] [CrossRef] [PubMed]
  52. Wang, W.; Bhattacharyya, S.; Marangoni, R.G.; Carns, M.; Dennis-Aren, K.; Yeldandi, A.; Wei, J.; Varga, J. The JAK/STAT pathway is activated in systemic sclerosis and is effectively targeted by tofacitinib. J. Scleroderma Relat. Disord 2019, 5, 40–50. [Google Scholar] [CrossRef] [PubMed]
  53. Junttila, I.S. Tuning the cytokine responses: An update on interleukin (IL)-4 and IL-13 receptor complexes. Front. Immunol. 2018, 9, 888. [Google Scholar] [CrossRef] [PubMed]
  54. Oetjen, L.K.; Mack, M.R.; Feng, J.; Whelan, T.M.; Niu, H.; Guo, C.J.; Chen, S.; Trier, A.M.; Xu, A.Z.; Tripathi, S.V.; et al. Sensory neurons co-opt classical immune signaling pathways to mediate chronic itch. Cell 2017, 171, 217–228.e213. [Google Scholar] [CrossRef] [Green Version]
  55. Ju, T.; Labib, A.; Vander Does, A.; Yosipovitch, G. Topical janus kinase-signal transducers and activators of transcription inhibitor tofacitinib is effective in reducing nonatopic dermatitis chronic itch: A case series. J. Am. Acad. Dermatol. 2022, 87, 400–403, online ahead of print. [Google Scholar] [CrossRef]
  56. Abbas, L.; Joseph, A.; Kunzler, E.; Jacobe, H.T. Morphea: Progress to date and the road ahead. Ann. Transl. Med. 2021, 9, 437. [Google Scholar] [CrossRef]
  57. Lis-Święty, A.; Skrzypek-Salamon, A.; Ranosz-Janicka, I.; Brzezińska-Wcisło, L. Associations between disease activity/severity and damage and health-related quality of life in adult patients with localized scleroderma—A comparison of loscat and visual analogue scales. J. Clin. Med. 2020, 9, 756. [Google Scholar] [CrossRef] [Green Version]
  58. Lis-Święty, A.; Skrzypek-Salamon, A.; Ranosz-Janicka, I.; Brzezińska-Wcisło, L. Health-related quality of life and its influencing factors in adult patients with localized scleroderma—A cross-sectional study. Health Qual. Life Outcomes 2020, 18, 1–10. [Google Scholar] [CrossRef]
  59. Kroft, E.B.M.; Jong, E.M.G.J.d.; Evers, A.W.M. Psychological distress in patients with morphea and eosinophilic fasciitis. Arch. Dermatol. 2009, 145, 1017–1022. [Google Scholar] [CrossRef] [Green Version]
  60. Narbutt, J.; Hołdrowicz, A.; Lesiak, A. Morphea—Selected local treatment methods and their effectiveness. Reumatologia 2017, 55, 305–313. [Google Scholar] [CrossRef] [Green Version]
  61. Frez, M.L.F.; Eusebio-Alpapara, K.M.V.; Pastorfide, G.C.; Castillo, R.L.; Tioleco, G.S. Treatment of morphea with narrowband ultraviolet b: A case series. J. Phil. Dermatol. Soc. 2019, 11, 36–50. [Google Scholar]
  62. Kreuter, A.; Hyun, J.; Stücker, M.; Sommer, A.; Altmeyer, P.; Gambichler, T. A randomized controlled study of low-dose UVA1, medium-dose UVA1, and narrowband UVB phototherapy in the treatment of localized scleroderma. J. Am. Acad. Dermatol. 2006, 54, 440–447. [Google Scholar] [CrossRef] [PubMed]
  63. Legat, F.J. The antipruritic effect of phototherapy. Front. Med. 2018, 5, 333. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  64. Stausbøl-Grøn, B.; Olesen, A.; Deleuran, B.; Deleuran, M. Abatacept is a promising treatment for patients with disseminated morphea profunda: Presentation of two cases. Acta Derm. Venereol. 2011, 91, 686–688. [Google Scholar] [CrossRef] [Green Version]
  65. Negrini, S.; Emmi, G.; Greco, M.; Borro, M.; Sardanelli, F.; Murdaca, G.; Indiveri, F.; Puppo, F. Sjögren’s syndrome: A systemic autoimmune disease. Clin. Exp. Med. 2021, 22, 9–25. [Google Scholar] [CrossRef]
  66. Bernacchi, E.; Amato, L.; Parodi, A.; Cottoni, F.; Rubegni, P.; Pitá, O.D.; Papini, M.; Rebora, A.; Bombardieri, S.; Fabbri, P. Sjögren’s syndrome: A retrospective review of the cutaneous features of 93 patients by the italian group of immunodermatology. Clin. Exp. Rheumatol. 2004, 22, 55–62. [Google Scholar]
  67. Valdes-Rodriguez, R.; Rowe, B.; Lee, H.; Moldovan, T.; Chan, Y.; Blum, M.; Yosipovitch, G. Chronic pruritus in primary sjögren’s syndrome: Characteristics and effect on quality of life. Acta Derm. Venereol. 2017, 97, 385–386. [Google Scholar] [CrossRef] [Green Version]
  68. Katayama, I.; Yokozeki, H.; Nishioka, K. Impaired sweating as an exocrine manifestation in sjögren’s syndrome. Br. J. Dermatol. 1995, 133, 716–720. [Google Scholar] [CrossRef]
  69. Bernacchi, E.; Bianchi, B.; Amato, L.; Tavoni, A.; Giorgini, S.; Bombardieri, S.; Fabbri, P. Xerosis in primary sjögren syndrome: Immunohistochemical and functional investigations. J. Dermatol. Sci. 2005, 39, 53–55. [Google Scholar] [CrossRef]
  70. Parisis, D.; Chivasso, C.; Perret, J.; Soyfoo, M.S.; Delporte, C. Current state of knowledge on primary sjögren’s syndrome, an autoimmune exocrinopathy. J. Clin. Med. 2020, 9, 2299. [Google Scholar] [CrossRef]
  71. Descamps, E.; Henry, J.; Labeyrie, C.; Adams, D.; Ghaidaa, A.N.; Vandendries, C.; Adam, C.; Aiello, D.; Mariette, X.; Seror, R. Small fiber neuropathy in sjögren syndrome: Comparison with other small fiber neuropathies. Muscle Nerve 2019, 61, 515–520. [Google Scholar] [CrossRef] [PubMed]
  72. Rosen, J.D.; Fostini, A.C.; Yosipovitch, G. Diagnosis and management of neuropathic itch. Dermatol. Clin. 2018, 36, 213–224. [Google Scholar] [CrossRef] [PubMed]
  73. Liang, Y.; Yang, Z.; Qin, B.; Zhong, R. Primary sjögren’s syndrome and malignancy risk: A systematic review and meta-analysis. Ann. Rheum. Dis. 2014, 73, 1151–1156. [Google Scholar] [CrossRef] [PubMed]
  74. Brito-Zerón, P.; Kostov, B.; Fraile, G.; Caravia-Durán, D.; Maure, B.; Rascón, F.-J.; Zamora, M.; Casanovas, A.; Lopez-Dupla, M.; Ripoll, M.; et al. Characterization and risk estimate of cancer in patients with primary sjögren syndrome. J. Hematol. Oncol. 2017, 10, 90. [Google Scholar] [CrossRef] [Green Version]
  75. Yosipovitch, G. Chronic pruritus: A paraneoplastic sign. Dermatol. Ther. 2010, 23, 590–596. [Google Scholar] [CrossRef] [Green Version]
  76. Kumar, S.; Kuruvilla, M.; Pai, G.; Dinesh, M. Cutaneous manifestations of non-Hodgkin’s lymphoma. Indian J. Dermatol. Venereol. Leprol. 2003, 69, 12–15. [Google Scholar]
Diagnostics 12 01772 g001 550
Figure 1. The possible mechanisms of ACTD-related pruritus. Inflammatory cytokines, such as IL-33 and IL-31, released from keratinocytes and immune cells transduce the itch sensation directly. Meanwhile, other inflammatory cytokines might participate in pruritus transduction through activation of the JAK/STAT pathway. Small-fiber neuropathy and opioid signaling also modulate the perception of pruriception. Therapies targeting the above mediators might reduce the intensity of itch in patient with ACTDs.
Figure 1. The possible mechanisms of ACTD-related pruritus. Inflammatory cytokines, such as IL-33 and IL-31, released from keratinocytes and immune cells transduce the itch sensation directly. Meanwhile, other inflammatory cytokines might participate in pruritus transduction through activation of the JAK/STAT pathway. Small-fiber neuropathy and opioid signaling also modulate the perception of pruriception. Therapies targeting the above mediators might reduce the intensity of itch in patient with ACTDs.
Diagnostics 12 01772 g001
Table
Table 1. Summary of studies of possible mechanisms for ACTD-related pruritus and potential targeted treatments.
Table 1. Summary of studies of possible mechanisms for ACTD-related pruritus and potential targeted treatments.
Proposed MechanismsPotential Targeted Treatments
Dermatomyositis
IL-31 [11]Nemolizumab, BMS-98116, vixarelimab, lenabasum
Small-fiber neuropathy [14]Neuro-modulating agents (e.g., gabapentin, pregabalin)
Inflammatory componentsTacrolimus [10], apremilast [21]
Cutaneous lupus erythematosus
Small-fiber neuropathy [25]Neuro-modulating agents (e.g., gabapentin, pregabalin)
Neuropathic itch [26]Neuro-modulating agents (e.g., gabapentin, pregabalin)
IL-6 [25], IL-33 [30], IL-31 [31]Topical corticosteroid, calcineurin inhibitor, methotrexate, azathioprine
Systemic sclerosis
Xerosis [42]Emollient [49]
IL-6, IL-15, IL-23, IL-17 [48]Rituximab [48]
Opioid signalingNaltrexone [51]
JAK/STAT signaling [52]JAK inhibitor (e.g., tofacitinib) [52]
Morphea
Inflammatory componentsPhototherapy [61,62], abatacept [64]
Sjögren syndrome
Xerosis [67]Emollient
Small-fiber neuropathy [71]Neuro-modulating agents (e.g., gabapentin, pregabalin)
The proposed mechanisms of different ACTDs and the possible therapies were summarized. IL, interleukin; JAK/STAT, Janus kinase/signal transducer and activator of transcription. The data above were retrieved before 30 June 2022.
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Share and Cite

MDPI and ACS Style

Wong, L.-S.; Yen, Y.-T. Autoimmune Connective Tissue Diseases-Related Pruritus: Proper Diagnosis and Possible Mechanisms. Diagnostics 2022, 12, 1772. https://doi.org/10.3390/diagnostics12071772

AMA Style

Wong L-S, Yen Y-T. Autoimmune Connective Tissue Diseases-Related Pruritus: Proper Diagnosis and Possible Mechanisms. Diagnostics. 2022; 12(7):1772. https://doi.org/10.3390/diagnostics12071772

Chicago/Turabian Style

Wong, Lai-San, and Yu-Ta Yen. 2022. "Autoimmune Connective Tissue Diseases-Related Pruritus: Proper Diagnosis and Possible Mechanisms" Diagnostics 12, no. 7: 1772. https://doi.org/10.3390/diagnostics12071772

APA Style

Wong, L.-S., & Yen, Y.-T. (2022). Autoimmune Connective Tissue Diseases-Related Pruritus: Proper Diagnosis and Possible Mechanisms. Diagnostics, 12(7), 1772. https://doi.org/10.3390/diagnostics12071772

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

Article Metrics

Back to TopTop