Carex meyeriana Kunth Extract Is a Novel Natural Drug against Candida albicans
by
and
Panpan Du
1, 
Bingyan Liu
1,
Xueting Wang
1,
Zhong Zheng
2,
Shu Liu
2,
Songlei Guan
1,* and
Zong Hou
2 1
School of Life Sciences, Jilin Agricultural University, Changchun 130118, China
2
Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2024, 25(13), 7288; https://doi.org/10.3390/ijms25137288
Submission received: 13 May 2024
/
Revised: 16 June 2024
/
Accepted: 26 June 2024
/
Published: 2 July 2024
(This article belongs to the Section Bioactives and Nutraceuticals)
Abstract
:As a widely distributed plant in Northeast China, Carex meyeriana Kunth (CMK) is generally considered to have antibacterial properties; however, there is a lack of scientific evidence for this. Therefore, we investigated the chemical composition of CMK extract and its effect against C. albicans. A total of 105 compounds were identified in the alcohol extracts of CMK by UPLC-Q-TOF-MS. Most were flavonoids, with Luteolin being the most represented. Among them, 19 compounds are found in the C. albicans lysates. After treatment with CMK ethanol extract, a significant reduction in the number of C. albicans colonies was observed in a vaginal douche solution from day 5 (p < 0.05). Furthermore, the CMK extract can reduce the number of C. albicans spores. The levels of IL-4, IL-6, IL-10, IL-1β, and TNF-α in vaginal tissues all exhibited a significant decrease (p < 0.05) compared to those in the model group as determined by ELISA. The results of HE staining showed that CMK extract can eliminate vaginal mucosa inflammation. CMK adjusts the vaginal mucosa cells by targeting twenty-six different metabolites and five specific metabolic pathways in order to effectively eliminate inflammation. Simultaneously, the CMK regulates twenty-three types of metabolites and six metabolic pathways against C. albicans infection. So, CMK strongly inhibits the growth of C. albicans and significantly reduces vaginal inflammation, making it a promising candidate for treating C. albicans infection.
1. Introduction
Candida albicans (C. albicans) is a normal part of the human body’s biome, and it is primarily located on the skin’s surface, in the mouth, and in the vagina. When the body’s immune system is compromised, C. albicans can become a pathogen, leading to infectious diseases [1]. C. albicans vaginitis accounts for 80–90% of fungal vaginitis infections in China [2]. Due to the overuse of antifungal drugs in China, there is a serious issue of fungal drug resistance [3,4,5]. Therefore, there is an urgent need to discover new antifungal drugs.
Carex meyeriana Kunth (CMK) is a species of sedge grass that is distributed in the regions of Amur, Buryat, Central China, Inner Mongolia, Irkutsk, Japan, Khabarovsk, North Korea, Manchuria, Mongolia, Primoye (Primorsky Krai), Western Siberia, and Yakutsk. The plant is triangular, hard, brown, and shiny. The leaves are thin and tough. Male flowers are terminal, cylindrical, and have lateral spikelets, and female flowers are spherical or ovoid; the fruit sac is equal to or slightly longer than the scales, oval or elliptic, and the nutlets are tightly wrapped in the fruit sac, obovate elliptic, and brown. The flowering and fruiting period is from June to July. The plant grows in warm, sunny and wet environments. It grows in wet meadow environments with perennial ponding, and its growing soil is mainly swamp soil. The mode of reproduction is seed reproduction.
The entire plant, CMK, is one of northeast China’s three treasures [6]. CMK is a natural plant with abundant resources and a high medicinal development value; it has been found to have effects such as eliminating mites, activating collateral circulation, and improving immunity. In recent years, its antibacterial and antifungal effects have garnered significant attention [7]. However, there is a lack of consistent conclusions regarding the antibacterial and antifungal mechanisms of CMK. The lack of in-depth studies of the mechanism may be attributed to an incomplete understanding of the chemical composition. The current studies mainly believe that flavonoids, alkaloids, fatty acids, and volatile oils are the most abundant components of CMK, and luteolin is the main component with pharmacological activity [7,8].
Therefore, in this study, the mechanism of CMK in preventing C. albicans vaginitis infections was analyzed through detailed chemical composition analysis, efficacy testing of fungi inhibition, metabolomics of rat vaginal mucosal tissue, microbial metabolomics and other methods. The findings of this study suggest that CMK may serve as a promising candidate to be an antifungal agent against C. albicans.
2. Results
2.1. Chemical Composition of Ethanol Extract from Carex meyeriana Kunth
CMK ethanol extract was used to identify a total of 105 compounds, including 33 flavonoids, 24 organic acid compounds, 14 phenylpropanoid compounds, 14 terpenoid compounds, and another 20 compounds. These findings will serve as the groundwork for future research on the therapeutic properties of the ethanolic extract of CMK. More importantly, a total of 19 original chemical components were found in C. albicans lyastes, primarily flavonoids. These components include neotigogenin acetate, luteolin, echinothiophene, trifolin, orientin, rutin, tracheloside, β-Hydroxyisovalerylshikonin, tiliroside, plantamajoside, sinensetin, isodemethylwedelolactone, tricin, isosilybin, wedelolactone, 9,16-Dioxyhydroxy-10,12,14 triene18 carbonic acid, and 6-gingerol Methyl lucidenate P. These components are most likely the potent chemicals in CMK that act against C. albicans. Please refer to Figure 1 and Figure 2 and Table 1, as well as Tables S8 and S9 in the Supplementary Materials, for more details.
2.2. The Inhibitory Effect of Carex meyeriana Kunth against C. albicans
The MIC of CMK is only 62.5 µg/mL (Figure 3). After 14 h, the inhibition rates significantly increase. Specifically, the inhibition percentage was 89.62% at the 24 h mark, and the highest percentage was 91.14% at the 26 h mark. This indicates that CMK strongly inhibited the growth and proliferation of C. albicans. Although MIC value is higher than that of fluconazole, as a natural plant component, it has a strong antifungal effect against C. albicans.
Figure 4 and Figure 5 illustrate colonies derived from rat vaginal lavage fluid. After 5 days, the number of vaginal colonies in the FCZ group, the high-dose group, and the low-dose group significantly decreased compared to those in the model group (p < 0.0001). No colonies formed in the control group.
The epithelial cell layer in the model group exhibited thickening, with localized shedding or the absence of epithelial cells. The epithelial layer test PAS+, and circular small granular spores are dispersed within the epithelial layer. However, no PAS+ spores were detected in either the FCZ group or the high-dose group, although two rats in the low-dose group displayed spores. Edematous changes in subepithelial tissues were observed in the FCZ group; however, there were no significant edematous changes in the subepithelial stroma in the high-dose group. Tissue inflammation was significantly reduced in both the low-dose and high-dose groups compare to the model group (Figure 6).
2.3. The Anti-Inflammatory of Carex meyeriana Kunth
2.3.1. The Levels of Inflammatory Mediators Are Decrease
The levels of IL-4, IL-6, IL-10, IL-1β, and TNF-α in the vaginal tissue of the model group were significantly higher than those in the control group (p < 0.05). These results indicate that these inflammatory mediators are associated with C. albicans infection. However, after treatment with CMK (regardless a high or low dose) or FCZ, the levels of IL-4, IL-6, IL-10, IL-1β, and TNF-α decreased significantly (p < 0.05). Furthermore, the levels of TNF-α, IL-6, IL-4, and IL-10 in the vaginal tissues were found to be similar between the high-dose and FCZ groups (Figure 7), providing further evidence that the anti-inflammatory effect of CMK extract closely resembles that of FCZ, which is commonly use in clinical practice.
2.3.2. Eliminating Inflammation of Vaginal Mucosa Tissue
We observed that the vaginal mucosa tissue of the healthy control group of rats exhibited even HE staining, with smooth mucosa, distinct tissue layers, neatly arranged epithelial cells, and no infiltration of inflammatory cells. In contrast, the vaginal mucosa epithelium of the model group showed excessive proliferation and abnormal keratinization of epithelial cells, as shown by the HE staining. Additionally, significant mucosa edema was present in the subepithelial stroma, accompanied by the infiltration of inflammatory cells such as neutrophils and lymphocytes. Furthermore, a large amount of capillary dilation and congestion was evident in the vaginal tissue.
However, in the treatment groups, the vaginal mucosa tissues of rats displayed signs of repair or healing. The numbers of infiltrate inflammatory cells in the subepithelial interstitium were reduced and mucosa edema in this area was effectively ameliorated. The vaginal mucosal tissue layer was restored (Figure 8). Following the elimination of vaginal inflammation, the weight of the rats gradually recovered (Supplementary Materials Figure S1).
2.3.3. Metabolites and Metabolic Pathways for Anti-Inflammatory in Vaginal Tissue
- (1)
- Prediction of potential targets in non-targeted metabolomics of vaginal tissue
Significant differences were observed in the metabolic profiles between groups (Supplementary Materials Figure S2). To identify potential targets, OPLS-DA in positive and negative ion scanning modes was established and S-plots were generated (Supplementary Materials Figure S3). A total of 26 endogenous metabolites were identified through the multivariate analysis. Following vaginal lavage, six of the metabolites illustrated a significant upregulation, while fourteen metabolites exhibited a significant downregulation (Table 2).
- (2)
- Non-targeted metabolic pathways in vaginal tissue
There are twenty-six metabolites that are potentially targeted by CMK in vaginal tissue, which disrupts eight metabolic pathways and thus inhibits inflammation. The metabolic network is illustrated in Figure 9, indicating that these metabolites mainly belong to several metabolic pathways such as glyoxylate and dicarboxylic acid metabolism, the citric acid cycle (TCA cycle), ether lipid metabolism, sphingolipid metabolism, or steroid hormone biosynthesis. CMK may interfere with 26 metabolites, thereby suppressing the mucosal inflammation.
2.4. Metabolites and Metabolic Pathway of Carex meyeriana Kunth against C. albicans
2.4.1. Prediction of Potential Targets in Non-Target Metabolomics of C. albicans
Significant differences were observed in the metabolic profiles between groups (Supplementary Materials Figure S4). OPLS-DA was established in the positive and negative ion scanning modes and S-plots were generated (Supplementary Materials Figure S5). A total of 23 endogenous metabolites were identified through multivariate analysis. Following drug treatment, nine metabolites showed a significant upregulation, while fourteen metabolites exhibited a significant downregulation (Table 3).
2.4.2. Non-Target Metabolic Pathways in C. albicans
Twenty-three metabolites are potentially targeted by CMK in C. albicans, and it was found that six metabolic pathways were disrupted and regulated. A metabolic network was constructed, as depicted in Figure 10, indicating that the potential metabolites mainly belong to several metabolic pathways such as purine metabolism, thiol metabolism, cysteine and methionine metabolism, arginine and proline metabolism, etc. CMK interferes with the purine and amino acid metabolism of C. albicans, affects nucleic acid and protein synthesis, and leads to its death.
3. Discussion
C. albicans vaginitis is a predominant female genital tract infection closely associated with various gynecological complications in women of reproductive age, accounting for 80% to 90% of all cases of vaginitis. Symptoms include increased vaginal discharge, swelling of the external genitalia, itching, and a burning sensation, significantly impacting women’s health and quality of life. At present, there are many kinds of drugs used for the treatment of Candida albicans infectious vaginitis, mainly including itraconazole, fluconazole, nystatin, clotrimazole, or miconazole, etc. [9,10,11]. However, due to the escalating issues of drug resistance and abuse, there is an urgent need to explore new antifungal medications [12,13]. Thus, extensive experiments have been conducted by scientists in this regard. Zida et al. identified 142 natural products with potential activity against C. albicans; most were derived from plants native to Asia and the United States. Additionally, 16 of these natural products had their antifungal activity confirmed through in vivo experimentation [14]. Gao et al. also discovered that quercetin, a dietary flavonoid, exhibited promising antifungal activity against C. albicans by inhibiting fungal adherence and biofilm formation [15]. These findings suggest that numerous natural products have promising clinical value in the treatment of vaginal candidiasis.
As a widely available plant with abundant resources and affordable prices, CMK is recognized as one of the “three treasures” in northeast China, alongside ginseng and deer antlers. It possesses a high application value and has been traditionally utilized to make insoles, pillows, mattresses, and other daily necessities for centuries. In ancient times, CMK was commonly used for insoles to provide warmth and prevent various fungal foot diseases when placed inside shoes [16]. However, due to limited research reports, the development of CMK products has been hindered, resulting in an underutilization of its medicinal benefits.
Su Ting utilized CMK extracts in the treatment of oral diseases caused by C. albicans, and the oral cavity recovered well. Only 94 chemical compounds were identified in Su Ting’s study. However, we identified 105 chemical compounds, due to the use of higher resolution scanning instruments and identification software, and most of which were different from those of Su Ting et al. [7]. The method used in this research has a higher sensitivity, resulting in more comprehensive and credible results. Therefore, these data provide a more comprehensive database of compounds for the medicinal development of CMK. Out of the 105 compounds identified, each ingredient exhibited pharmacological activity, indicating that CMK has a wide range of medicinal applications. In addition, the 19 compounds in the lysates may be the natural ingredients against C. albicans.
We observed that CMK inhibited the growth and proliferation of C. albicans by interfering with twenty-three metabolites and six types of metabolic pathways, including purine metabolism, sulfur metabolism, cysteine and methionine metabolism, and arginine and proline metabolism. These pathways are closely associated with nucleic acid and protein synthesis, directly interfering with the growth and reproduction of C. albicans. It is possible that CMK inhibits the growth of C. albicans by interfering with these key metabolic pathways. All these metabolites are potential regulatory targets for CMK inhibition of C. albicans.
We also performed a non-targeted metabolomics analysis on rat vaginal tissue and identified 26 metabolites. We identified five types of metabolic pathways closely related to vaginitis: glyoxylate and dicarboxylic acid metabolism; the citric acid cycle (TCA cycle); ether lipid metabolism; sphingolipid metabolism; and steroid hormone biosynthesis. Both sphingolipid metabolism and ether lipid metabolism are crucial for lipid metabolism, which is closely related to inflammation. Lipids can exert anti-inflammatory actions by interfering with inflammatory responses and inflammatory mediators. When our bodies are invaded by fungi, lipids will move to the location of the lesions, mobilizing the immune system to resist it [17,18].
All metabolites in this study were potential targets of CMK as fungicides. N-acetylsphingosine has been identified in this study, playing a key role as an intermediate in sphingolipid metabolism. The phosphorylation product of sphingosine, known as sphinganine-1-phosphate (S1P), is closely associated with various inflammatory diseases and cytokines [19,20,21]. S1P and its receptors actively participate in regulating the body’s inflammatory responses [22,23,24]. In the ether lipid metabolism pathway, dihydroxyacetone phosphate Ester is converted into 1-alkyl-glycerone-3-phosphate using alkyl dihydroxyacetone phosphate synthase, thereby exerting immunomodulatory, anti-inflammatory, and antifungal. 5-androstenediol, a steroid hormone, can stimulate the immune system and bone marrow leukocytes to resist the pathogenic microorganisms [25].
The tricarboxylic acid (TCA) cycle and the metabolism of glyoxylate and dicarboxylic acid play a crucial role in energy metabolism. The TCA cycle, also known as the citric acid cycle, is a fundamental metabolic pathway in aerobic organisms. Glyoxylate and dicarboxylic acid metabolism are essential steps allowing fatty acids to enter the TCA cycle. We have discovered that the CMK extract can upregulate the TCA cycle, as well as interfere with glyoxalic acid and dicarboxylic acid metabolism. The regulation of the TCA cycle process is primarily achieved by changing the levels of citric acid and cis-aconitic acid. Citrate is a TCA cycle metabolite that accumulates in activated immune cells. Mitochondrial citrate is converted into isocitrate via cis-aconitate by the enzyme aconitase of the TCA cycle. These two metabolites can increase the anti-inflammatory response of immune cells [26]. Palsson-McDermott EM et al. demonstrated that TCA cycle metabolism in anti-inflammatory immune cells is significantly upregulated in inflammatory tissues, such as CD8+T cells and M2 macrophages [27].
4. Materials
The reagents, equipments, and animals are shown in the Supplementary Materials, specifically Tables S1–S3.
5. Methodology
5.1. Extraction of Carex meyeriana Kunth
The CMK powder (90 g) was refluxed three times with 70% ethanol, for 1 h each time. The filtrate was then combined, concentrated, and diluted with deionized water. The minimal inhibitory concentration (MIC) was determined using the broth microdilution method. The inhibition rate of CMK against C. albicans was calculated as follows:
Inhibition rate (Y) = [1 − (Aexperimental group − Ablank)/(Acontrol − Ablank)] × 100%.
5.2. Identification of Ingredients in Carex meyeriana Kunth Extracts
The total chemical components of the CMK ethanol extracts and the chemical constituents in the C. albicans lysates (the lysis method for C. albicans can be found in Supplementary Materials 1.3, Tables S4 and S5) were analyzed using ultra-performance liquid chromatography–quadrupole tandem time-of-flight mass spectrometry (UPLC-Q-TOF-MSE). The chromatographic and mass spectrometry conditions are also detailed in Supplementary Materials 1.4 and 1.5. Data were collected using MassLynx V4.1 software, matched with a database derived from the UNIFI data platform (a chemical database developed by the WatersTM instrument workstation, USA). Compounds with an error of less than 5 ppm were selected for standard comparison, secondary ion mass spectrometry fragment information verification, and documentation, and were then combined with the mass spectrometry fragmentation patterns to infer the chemical composition and source. Three traditional Chinese medicine standards of Tricin, Luteolin, and Myricetin were used for verification of flavonoids. (The linearity of the standards was very good, R2 > 0.999, Supplementary Materials Figures S6–S8.)
5.3. Vaginitis Rats Were Infected with C. albicans
Rats with C. albicans vaginitis were used based on the standard procedure method described in refs. [28,29,30].
- (1)
- Pretreatment: After 1 week of adaption, 0.5 mL/100 g estradiol benzoate for veterinary purposes was injected subcutaneously into each rat daily for 2 days. After 6 days, the drug-induced rat estrus model was successfully established, and then the rats were injected every 2 days until the end of the experiment.
- (2)
- Intravaginal inoculation: One day after successfully establishing a drug-induced estrus model in rats, 1.5 × 108 CFU/mL of C. albicans suspension was spread over the vagina mucosa at a dose of 200 μL for each rat. The control group was given an equal amount of sterile water. The procedure was repeated daily for 4 days. The evaluation criteria for a successful infection of C. albicans included visible congestion, edema, and increased secretion of the vulva and vaginal mucosa to the naked eye, as well as fungi (+) in the vaginal secretions.
- (3)
- Drug treatment: All rats were randomly divided into five groups: model group (vaginitis due to C. albicans), control group (2 mL of 0.9% sodium chloride solution), fluconazole (FCZ) group (the C. albicans vaginitis rats were treated with 13.5 mg/kg fluconazole), a high-dose group (the C. albicans vaginitis rats were treated with 8 g/kg of CMK extract), and a low-dose group (the C. albicans vaginitis rats were treated with 2 g/kg of CMK extract), with eight rats in each group. Medication was applied to the vaginal area. Drug treatment continued for 14 consecutive days.
5.4. Numbers of C. albicans Colonies
WE used 0.9% sodium chloride solution to repeatedly rinse the vaginas of rats, and a total of 1 mL of vaginal lavage solution was collected from the day before and 2, 5, 8, 11, and 14 days after medication. The collected samples were centrifuged at 6000 r/min for 10 min; then, the supernatant was diluted. Subsequently, 100 μL of the diluted solution was inoculated into LB culture medium and incubated at 37 °C for 24 h. The resulting colonies (CFU/mL) were then counted.
5.5. Inflammatory Mediators in the Vaginal Tissue
The levels of IL-4, IL-6, IL-10, IL-1β, and TNF-α from vaginal tissue were measured using double antibody sandwich ELISA after continuous administration of the treatment for 14 days.
5.6. Vaginal Histopathological Staining
HE and PAS staining were performed to investigate the effect of CMK on rats’ vaginal tissues after its continuous administration for 14 days.
5.7. Metabolomics Analysis
The samples (the collection method for which is shown in the Supplementary Materials 1.6 and 1.7) included the vaginal pathological tissues of rats and C. albicans (103 CFU/mL). UPLC-Q-TOF-MS was utilized for detection (the conditions can be found in the Supplementary Materials 1.8, Tables S6 and S7). The raw data were analyzed using progenesis QI software v3.0. Subsequently, EZinfo2.0 software was employed for multivariate statistical analysis. Principal component analysis (PCA) and orthogonal partial least-squares differentiation analysis (OPLS-DA) were used to analyze the changes in the metabolic profiles of each group and to screen for potential biomarkers. Compounds with VIP > 1 and p < 0.05 were identified as differential metabolites. Then, the information about the metabolites was matched with the information in the HMDB database (http://www.hmdb.ca/, accessed on 4 February 2024). Finally, identification and enrichment analysis of the metabolic pathways was conducted using the KEGG (http://www.kegg.com, accessed on 4 February 2024) and MetaboAnalyst 5.0 (http://www.metaboanalyst.ca, accessed on 4 February 2024) databases.
5.8. Statistical Analysis
All data were analyzed using GraphPad Prism 7, and significant differences between groups were analyzed using t-tests and LSD methods.
6. Conclusions
Our experimental results demonstrate that CMK not only exhibits strong anti-C. albicans properties but also exhibits an anti-inflammatory effect by regulating multiple metabolic targets and metabolic pathways, showing promising clinical application prospects. In conclusion, as a widely distributed plant in northeast China, CMK has the potential to effectively treat vaginitis caused by C. albicans.
Supplementary Materials
The following supporting information can be downloaded at: https://www.mdpi.com/article/10.3390/ijms25137288/s1.
Author Contributions
Conceptualization, S.G. and Z.H.; methodology, P.D.; software, P.D. and B.L.; validation, B.L. and P.D.; data curation, X.W. and Z.Z.; writing—original draft preparation, P.D.; writing—review and editing, S.G.; visualization, X.W.; supervision, S.L.; project administration, S.G. and Z.H.; funding acquisition, S.G. All authors have read and agreed to the published version of the manuscript.
Funding
Science and Technology Research Project of the Education Department of Jilin, China (NO. JJKH20240471KJ). National College Students Innovation and Entrepreneurship Project.
Institutional Review Board Statement
This experiment was approved by the Animal Research Ethics Committee of Changchun, Institute of Applied Chemistry Chinese Academy of Sciences (20230169). The method and purpose of this animal experiment complied with ethical standards and international practices, and complied with relevant regulations, ethical welfare principles for experimental animals, and the rules and regulations of the animal laboratory during the animal experiment. Attention was paid to animal welfare and ethical issues in animal experiments during the experiment.
Data Availability Statement
The authors declare that the data supporting the findings of this study are available within the paper and its Addition file. Should any raw data files be needed in another format they are available from the corresponding author upon reasonable request.
Conflicts of Interest
The authors state that they have no conflicts of interest.
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Figure 1.
Total ion flow diagrams of the CMK ethanol extract. (A) Positive ion mode; (B) Negative ion mode.
Figure 1.
Total ion flow diagrams of the CMK ethanol extract. (A) Positive ion mode; (B) Negative ion mode.
Figure 2.
Total ion flow diagram of the C. albicans lysis solution. (A) Positive ion mode; (B) Negative ion mode.
Figure 2.
Total ion flow diagram of the C. albicans lysis solution. (A) Positive ion mode; (B) Negative ion mode.
Figure 3.
The growth inhibition effect of CMK on C. albicans. MIC of CMK is 62.5 µg/mL. MIC of fluconazole is 15.5 µg/mL.
Figure 3.
The growth inhibition effect of CMK on C. albicans. MIC of CMK is 62.5 µg/mL. MIC of fluconazole is 15.5 µg/mL.
Figure 4.
The C. albicans colonies. Rat vaginal lavage solution coated on LB solid medium. (A) Control group. (B) Model group; (C) FCZ group; (D) high-dose group; (E) low-dose group. After 5 days, the number of colonies of the FCZ group and high dose groups significantly decreased.
Figure 4.
The C. albicans colonies. Rat vaginal lavage solution coated on LB solid medium. (A) Control group. (B) Model group; (C) FCZ group; (D) high-dose group; (E) low-dose group. After 5 days, the number of colonies of the FCZ group and high dose groups significantly decreased.
Figure 5.
The number of Candida albicans colonies in vaginal flushing fluid. Compared to the model group, the difference is statistically significant (**** p < 0.0001).
Figure 5.
The number of Candida albicans colonies in vaginal flushing fluid. Compared to the model group, the difference is statistically significant (**** p < 0.0001).
Figure 6.
The pathological sections of vaginal tissue of the rats are stain with PAS (×200). In model group, black arrows indicate spores present in the vaginal tissues. However, there is no significant infiltration of C. albicans spores observe in the vaginal tissues of rats treat with fluconazole or high-dose CMK. Only two rats in the low-dose group show a small amount of spore infiltration in their vaginal tissues, as indicate by PAS staining.
Figure 6.
The pathological sections of vaginal tissue of the rats are stain with PAS (×200). In model group, black arrows indicate spores present in the vaginal tissues. However, there is no significant infiltration of C. albicans spores observe in the vaginal tissues of rats treat with fluconazole or high-dose CMK. Only two rats in the low-dose group show a small amount of spore infiltration in their vaginal tissues, as indicate by PAS staining.
Figure 7.
Levels of IL-4, IL-6, IL-10, IL-1β, and TNF-α in vaginal tissues of vaginitis model rats. Comparison with the control group, # p < 0.05; comparison with the model group, * p < 0.05.
Figure 7.
Levels of IL-4, IL-6, IL-10, IL-1β, and TNF-α in vaginal tissues of vaginitis model rats. Comparison with the control group, # p < 0.05; comparison with the model group, * p < 0.05.
Figure 8.
Pathological section of vaginal tissue of rats. Biopsies were stained with HE, ×200. The control group’s mucosa is made up of smooth, distinct tissue layers, without inflammatory cell infiltration, and the cells are arranged neatly. The model group’s vaginal tissues show severe edema, cell deformation, telangiectasia, and inflammatory cell infiltration in the submucosa. The vaginal mucosal tissue edema of rats in the FCZ group, high-dose group, and low-dose group was significantly reduced, inflammatory cell infiltration was significantly reduced, and the vascular dilation and congestion disappeared.
Figure 8.
Pathological section of vaginal tissue of rats. Biopsies were stained with HE, ×200. The control group’s mucosa is made up of smooth, distinct tissue layers, without inflammatory cell infiltration, and the cells are arranged neatly. The model group’s vaginal tissues show severe edema, cell deformation, telangiectasia, and inflammatory cell infiltration in the submucosa. The vaginal mucosal tissue edema of rats in the FCZ group, high-dose group, and low-dose group was significantly reduced, inflammatory cell infiltration was significantly reduced, and the vascular dilation and congestion disappeared.
Figure 9.
The metabolic networks of major metabolites in vaginal tissue. In the bubble chart, the redder and the larger the bubble size, the more significant the changes in potential biomarkers of metabolic pathways such as ether lipids metabolism, TCA cycle, sphingolipid metabolism, glyoxylate and dicarboxylate metabolism, and steroid hormone biosynthesis. Based on the bubble map, the metabolic network of the aforementioned five metabolic pathways has been delineated. Glyoxylate and dicarboxylate metabolism of Glyoxylic acid to L-Malic acid and Glyceric acid, respectively; L-Malic acid metabolism of cis-Aconitic acid, and the further metabolism of cis-Aconitic acid to citric acid. Citric acid metabolizes 2-Oxoglutarate, and 2-Oxoglutarate can be metabolized to L-Malic acid through the TCA cycle to provide energy for the body. Glyceric acid is metabolized to Glyceric acid, Glyceric acid is further metabolized to D-Glyceraldehyde, D-Glyceraldehyde is metabolized to Glycerophosphoric acid, and Glycerophosphoric acid is metabolized to LysoPA, which is further metabolized to PEs, which are metabolized to Arachidonic acid and 1-Acyl-glycerone-3-phosphate, respectively. PCs can be metabolized to Arachidonic acid and LysoPA, respectively. 1-Acyl-glycerone-3-phosphate in Ether lipid metabolism can be metabolized to Dihydroxyacetone Phosphate Acyl Ester. Dihydroxyacetone Phosphate Acyl Ester is further metabolized to O-Alkylglycerone phosphate. Finally, O-Alkylglycerone phosphate was metabolized to Glycerophosphocholine. Sphingolipid is metabolized to Sphingosine 1-phosphate which is further metabolized to N-Acylsphingosine, and N-Acylsphingosine metabolizes to Galactosylceramide sulfate, thus maintaining a normal physiological state. Cholesterol is metabolized by the steroid hormone biosynthesis to Dehydroepinandrosterone, and Dehydroepinandrosterone can be further metabolized to 5-Androstenediol; 5-Androstenediol is finally metabolized to Androst-4-ene-3,17-dione and 2-Hydroxyestradiol-17β, which resist the invasion of pathogenic microorganisms. These metabolic pathways directly affect the energy metabolism process of vaginal mucosa or mucosal immune cells.
Figure 9.
The metabolic networks of major metabolites in vaginal tissue. In the bubble chart, the redder and the larger the bubble size, the more significant the changes in potential biomarkers of metabolic pathways such as ether lipids metabolism, TCA cycle, sphingolipid metabolism, glyoxylate and dicarboxylate metabolism, and steroid hormone biosynthesis. Based on the bubble map, the metabolic network of the aforementioned five metabolic pathways has been delineated. Glyoxylate and dicarboxylate metabolism of Glyoxylic acid to L-Malic acid and Glyceric acid, respectively; L-Malic acid metabolism of cis-Aconitic acid, and the further metabolism of cis-Aconitic acid to citric acid. Citric acid metabolizes 2-Oxoglutarate, and 2-Oxoglutarate can be metabolized to L-Malic acid through the TCA cycle to provide energy for the body. Glyceric acid is metabolized to Glyceric acid, Glyceric acid is further metabolized to D-Glyceraldehyde, D-Glyceraldehyde is metabolized to Glycerophosphoric acid, and Glycerophosphoric acid is metabolized to LysoPA, which is further metabolized to PEs, which are metabolized to Arachidonic acid and 1-Acyl-glycerone-3-phosphate, respectively. PCs can be metabolized to Arachidonic acid and LysoPA, respectively. 1-Acyl-glycerone-3-phosphate in Ether lipid metabolism can be metabolized to Dihydroxyacetone Phosphate Acyl Ester. Dihydroxyacetone Phosphate Acyl Ester is further metabolized to O-Alkylglycerone phosphate. Finally, O-Alkylglycerone phosphate was metabolized to Glycerophosphocholine. Sphingolipid is metabolized to Sphingosine 1-phosphate which is further metabolized to N-Acylsphingosine, and N-Acylsphingosine metabolizes to Galactosylceramide sulfate, thus maintaining a normal physiological state. Cholesterol is metabolized by the steroid hormone biosynthesis to Dehydroepinandrosterone, and Dehydroepinandrosterone can be further metabolized to 5-Androstenediol; 5-Androstenediol is finally metabolized to Androst-4-ene-3,17-dione and 2-Hydroxyestradiol-17β, which resist the invasion of pathogenic microorganisms. These metabolic pathways directly affect the energy metabolism process of vaginal mucosa or mucosal immune cells.
Figure 10.
The metabolic networks of major metabolites of C. albicans. In the bubble chart, the redder the bubble and the larger the bubble size, the more significant changes in potential biomarkers of metabolic pathways such as purine metabolism, sulfur metabolism, cysteine and methionine metabolism, arginine and proline metabolism. Based on the bubble map, the metabolic network of the aforementioned five metabolic pathways has been delineated. In sulfur metabolism, sulfate is metabolized by thiosulfate and S-sulfanylglutathione. Sulfate is further metabolized to adenosine phosphosulfate, which eventually converts to 3′-phosphoadenylyl sulfate. Meanwhile, S-sulfanylglutathione is metabolized to methanethiol, which in turn is further metabolized to L-methionine. L-methionine then undergoes further metabolism to L-cysteine, followed by conversion to S-adenosyl-L-methioine. This compound is subsequently metabolized to S-adenosylmethioninamine, finally leading to the production of 3-S-methylthiopropionate and spermidine. Spermidine itself goes through a metabolic process that results in its conversion into spermine. Eventually, this leads to involvement in glutathione metabolism, pantothenate and CoA biosynthesis, as well as β-alanine metabolism. These processes directly regulate the growth and reproduction of C. albicans. In purine metabolism, aminoimidazole ribotide derives from glycineamide ribotide and 5′-phosphoribosy1-4-carboxy-5-aminoimidazole. The latter can be converted into aminoimidazole ribotide or 5′-phosphoribosy1-5-formamido-4-imidazolecarboxamide. The latter compound then undergoes further metabolism into inosinic acid before being converted into xanthylic acid as part of xanthylic acid metabolism for xanthosine. The above metabolic pathways directly interfered with the nucleic acid and protein synthesis of C. albicans.
Figure 10.
The metabolic networks of major metabolites of C. albicans. In the bubble chart, the redder the bubble and the larger the bubble size, the more significant changes in potential biomarkers of metabolic pathways such as purine metabolism, sulfur metabolism, cysteine and methionine metabolism, arginine and proline metabolism. Based on the bubble map, the metabolic network of the aforementioned five metabolic pathways has been delineated. In sulfur metabolism, sulfate is metabolized by thiosulfate and S-sulfanylglutathione. Sulfate is further metabolized to adenosine phosphosulfate, which eventually converts to 3′-phosphoadenylyl sulfate. Meanwhile, S-sulfanylglutathione is metabolized to methanethiol, which in turn is further metabolized to L-methionine. L-methionine then undergoes further metabolism to L-cysteine, followed by conversion to S-adenosyl-L-methioine. This compound is subsequently metabolized to S-adenosylmethioninamine, finally leading to the production of 3-S-methylthiopropionate and spermidine. Spermidine itself goes through a metabolic process that results in its conversion into spermine. Eventually, this leads to involvement in glutathione metabolism, pantothenate and CoA biosynthesis, as well as β-alanine metabolism. These processes directly regulate the growth and reproduction of C. albicans. In purine metabolism, aminoimidazole ribotide derives from glycineamide ribotide and 5′-phosphoribosy1-4-carboxy-5-aminoimidazole. The latter can be converted into aminoimidazole ribotide or 5′-phosphoribosy1-5-formamido-4-imidazolecarboxamide. The latter compound then undergoes further metabolism into inosinic acid before being converted into xanthylic acid as part of xanthylic acid metabolism for xanthosine. The above metabolic pathways directly interfered with the nucleic acid and protein synthesis of C. albicans.
Table 1.
The chemical components derived from C. albicans lysates.
| NO. | Components | tR/min | Formula | Calculated Mass (m/z) | Found Mass (m/z) | Error (ppm) | Adducts | Fragment (m/z) |
|---|---|---|---|---|---|---|---|---|
| 1 | Neotigogenin acetate | 7.90 | C12H46O4 | 459.3504 | 458.3396 | 3.5 | +H | 217.1353 |
| 2 | Luteolin | 10.99 | C15H10O6 | 287.0571 | 286.0477 | 2.1 | +H | 117.1326 |
| 3 | Aschantin | 18.94 | C22H24O7 | 401.1601 | 400.1522 | 0.6 | +H | 383.1541, 401.1440 |
| 4 | Echinothiophene | 18.99 | C23H26O10S | 495.1292 | 494.1247 | −2.8 | +H | 475.1083, 493.1315 |
| 5 | Trifolin | 6.98 | C21H20O11 | 447.0937 | 448.1006 | 0.4 | −H | 284.0319 |
| 6 | Orientin | 7.02 | C21H20O11 | 447.0945 | 448.1006 | 1.3 | −H | 285.0397, 297.0378, 299.0555, 327.0535, 357.2607 |
| 7 | Rutin | 7.47 | C27H30O16 | 609.1482 | 610.1534 | 2.1 | −H | 300.1355 |
| 8 | Tracheloside | 8.29 | C27H34O12 | 549.1974 | 550.2050 | −0.4 | −H | 550.2015 |
| 9 | β-Hydroxyisovalerylshikonin | 9.64 | C21H24O7 | 433.1512 | 388.1522 | 0.8 | +HCOO | 225.0732, 252.1370, 338.2455 |
| 10 | Tiliroside | 11.12 | C30H26O13 | 593.1322 | 594.1373 | 2.2 | −H | 255.0274, 284.0324, 285.0409 |
| 11 | Plantamajoside | 11.06 | C29H36O16 | 685.1979 | 640.2003 | −0.7 | +HCOO | 477.1230 |
| 12 | Sinensetin | 12.54 | C20H20O7 | 371.1139 | 372.1201 | 0.3 | −H | 328.0594 |
| 13 | Isodemethylwedelolactone | 14.25 | C15H8O7 | 299.0206 | 300.0270 | 0.9 | −H | 271.0264, 227.0337, 199.0376, 201.0170, 283.0131, 187.0002, 183.0425 |
| 14 | Tricin | 14.93 | C17H14O7 | 329.0673 | 330.0740 | 0.6 | −H | 329.0673, 314.0434, 271.0248, 227.0340, 185.0205, 161.0198 |
| 15 | Isosilybin | 15.17 | C26H24O10 | 495.1297 | 496.1370 | 0.0 | −H | 477.3274 |
| 16 | Wedelolactone | 17.92 | C16H10O7 | 313.036 | 314.0427 | 0.7 | −H | 299.0204 |
| 17 | 9,16-Dioxyhydroxy-10,12,14-triene-18 carbonic acid | 18.47 | C18H30O4 | 309.2059 | 310.2144 | −1.2 | −H | 211.0763 |
| 18 | 6-Gingerol | 20.16 | C17H26O4 | 293.1785 | 294.1831 | 2.6 | −H | 293.1780 |
| 19 | Methyl lucidenate P | 23.92 | C30H44O8 | 531.3007 | 532.3036 | 4.4 | −H | 531.3003 |
Table 2.
Metabolites identified in vaginal tissue.
| Mode | NO. | tR (min) | Formula | Measured Mass (m/z) | Proposed Identity | CON/MOD | HD/MOD | LD/MOD |
|---|---|---|---|---|---|---|---|---|
| ESI+ | 1 | 0.67 | C6H6O4 | 165.0110 | Sumiki’s acid | ↓ **** | ↓ *** | ↓ * |
| 2 | 0.78 | C8H7NO3 | 166.0426 | 4-Pyridoxolactone | ↓ *** | ↓ ** | ↓ | |
| 3 | 3.52 | C19H39NO3 | 330.3102 | Palmitoyl Serinol | ↓ ** | ↓ * | ↓ ** | |
| 4 | 3.55 | C21H30O2 | 337.2057 | 7-Dehydropregnenolone | ↓ * | ↓ *** | ↓ * | |
| 5 | 3.58 | C21H41NO3 | 356.3294 | Pristanoylglycine | ↑ | ↑ ** | ↑ | |
| 6 | 3.60 | C19H30O2 | 313.2026 | 5-Androstenediol | ↑ ** | ↑ | ↓ | |
| 7 | 3.72 | C4H7O7P | 199.0095 | Dihydroxyacetone Phosphate Acyl Ester | ↓ **** | ↓ | ↑ | |
| 8 | 4.46 | C19H26O2 | 286.4085 | Androst-4-ene-3,17-dione | ↑ | ↑ * | ↑ | |
| 9 | 4.80 | C20H32O6 | 368.2258 | 6,15-Diketo,13,14-dihydro-PGF1a | ↑ | ↓ **** | ↓ | |
| 10 | 6.79 | C26H43NO6 | 466.3181 | Glycocholic acid | ↑ ** | ↓ *** | ↓ * | |
| 11 | 7.36 | C19H32O | 299.2216 | 5a-Androstan-3b-ol | ↑ | ↑ * | ↑ | |
| 12 | 7.39 | C20H34O5 | 354.2460 | Prostaglandin F2a | ↑ **** | ↑ **** | ↑ *** | |
| 13 | 14.24 | C36H71NO3 | 566.5704 | N-Acylsphingosine | ↑ *** | ↑ | ↓ | |
| ESI− | 14 | 0.65 | C3H6O4 | 142.9751 | Glyceric acid | ↑ | ↑ * | ↑ |
| 15 | 0.72 | C6H8O7 | 191.0194 | Citric acid | ↑ ** | ↑ * | ↑ | |
| 16 | 1.30 | C2H2O3 | 72.9931 | Glyoxylic acid | ↓ | ↓ * | ↓ | |
| 17 | 2.82 | C8H16N2O3 | 187.1090 | N6-Acetyl-L-lysine | ↓ | ↓ * | ↓ | |
| 18 | 2.88 | C22H32O3 | 343.2351 | 19(20)-EpDPE | ↓ * | ↓ ** | ↓ | |
| 19 | 2.99 | C22H30O5 | 373.2152 | 11β,20-Dihydroxy-3-oxopregn-4-en-21-oic acid | ↓ | ↓ *** | ↓ | |
| 20 | 3.23 | C22H32O2 | 327.2387 | Docosahexaenoic acid | ↑ ** | ↑ | ↓ | |
| 21 | 3.41 | C6H6O6 | 173.0022 | cis-Aconitic acid | ↓ | ↓ * | ↓ * | |
| 22 | 3.67 | C25H34O8 | 461.2159 | 6-Dehydrotestosterone glucuronide | ↑ | ↑ **** | ↓ | |
| 23 | 3.72 | C19H38O2 | 343.2713 | Nonadecanoic acid | ↓ ** | ↓ *** | ↓ | |
| 24 | 4.13 | C21H34O4 | 349.2259 | 5a-Tetrahydrocorticosterone | ↓ * | ↓ | ↓ * | |
| 25 | 4.49 | C24H38O5 | 405.2675 | 7-Ketodeoxycholic acid | ↓ *** | ↓ *** | ↓ | |
| 26 | 6.08 | C18H35NO3 | 312.2468 | Palmitoylglycine | ↓ | ↓ ** | ↓ |
Note: Compared to the control group, * denotes a statistically significant increase or decrease in metabolites. The greater the number of *, the larger the statistical difference observed. ↓: down; ↑: up.
Table 3.
Metabolites of C. albicans identified.
| Mode | NO. | tR (min) | Formula | Measured Mass (m/z) | Proposed Identity | CMK/CON |
|---|---|---|---|---|---|---|
| ESI+ | 1 | 0.43 | C21H28O5 | 361.1924 | Aldosterone | ↓ ** |
| 2 | 0.56 | C14H23N6O3S | 378.1431 | S-Adenosylmethioninamine | ↑ * | |
| 3 | 0.97 | C3H7NO2S | 121.1586 | L-Cysteine | ↓ * | |
| 4 | 1.16 | C13H22N4O8S2 | 449.0710 | Cysteineglutathione disulfide | ↓ **** | |
| 5 | 1.68 | C19H28O3 | 327.2012 | 16-Oxoandrostenediol | ↓ ** | |
| 6 | 2.60 | C24H40O7S | 472.2553 | Chenodeoxycholic acid 3-sulfate | ↑ *** | |
| 7 | 4.01 | C19H30O3 | 329.2136 | 5-Androstenetriol | ↓ **** | |
| 8 | 5.53 | C22H45NO | 340.3487 | Docosanamide | ↓ * | |
| 9 | 7.35 | H2O3S2 | 114.1445 | Thiosulfate | ↑ ** | |
| 10 | 8.28 | C10H14N5O10PS | 450.0111 | Adenosine phosphosulfate | ↑ * | |
| 11 | 8.90 | C7H14N2O4S | 223.0655 | Allocystathionine | ↓ *** | |
| 12 | 9.69 | C7H15N2O8P | 286.0493 | Glycineamide ribotide | ↓ **** | |
| 13 | 10.13 | C26H45NO6S | 499.3147 | Taurochenodesoxycholic acid | ↓ *** | |
| 14 | 12.20 | C17H33NO4 | 316.2619 | Decanoylcarnitine | ↓ *** | |
| 15 | 12.40 | C8H17NOS2 | 230.0593 | Dihydrolipoamide | ↓ * | |
| ESI− | 16 | 0.95 | C14H11Cl2NO3 | 356.0077 | 4′-Hydroxydiclofenac | ↑ * |
| 17 | 6.52 | C26H32O14 | 613.1773 | Phloretin xylosyl-galactoside | ↑ **** | |
| 18 | 11.33 | C10H12N4O6 | 329.0666 | Xanthosine | ↑ **** | |
| 19 | 12.54 | C24H38O4 | 390.2764 | 9′-Carboxy-alpha-chromanol | ↓ * | |
| 20 | 12.65 | C11H14O4 | 209.0820 | 3,4-Dihydroxyphenylvaleric acid | ↓ **** | |
| 21 | 12.94 | C10H13N4O8P | 348.2062 | Inosinic acid | ↑ ** | |
| 22 | 13.48 | C15H22O2 | 279.1617 | Valerenic acid | ↓ **** | |
| 23 | 13.99 | C7H12N2O6 | 265.0702 | L-β-aspartyl-L-serine | ↑ ** |
Note: Compared to the control group, * denotes a statistically significant increase or decrease in metabolites. The greater the number of *, the larger the statistical difference observed. ↓: down; ↑: up.
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MDPI and ACS Style
Du, P.; Liu, B.; Wang, X.; Zheng, Z.; Liu, S.; Guan, S.; Hou, Z. Carex meyeriana Kunth Extract Is a Novel Natural Drug against Candida albicans. Int. J. Mol. Sci. 2024, 25, 7288. https://doi.org/10.3390/ijms25137288
AMA Style
Du P, Liu B, Wang X, Zheng Z, Liu S, Guan S, Hou Z. Carex meyeriana Kunth Extract Is a Novel Natural Drug against Candida albicans. International Journal of Molecular Sciences. 2024; 25(13):7288. https://doi.org/10.3390/ijms25137288
Chicago/Turabian StyleDu, Panpan, Bingyan Liu, Xueting Wang, Zhong Zheng, Shu Liu, Songlei Guan, and Zong Hou. 2024. "Carex meyeriana Kunth Extract Is a Novel Natural Drug against Candida albicans" International Journal of Molecular Sciences 25, no. 13: 7288. https://doi.org/10.3390/ijms25137288
APA StyleDu, P., Liu, B., Wang, X., Zheng, Z., Liu, S., Guan, S., & Hou, Z. (2024). Carex meyeriana Kunth Extract Is a Novel Natural Drug against Candida albicans. International Journal of Molecular Sciences, 25(13), 7288. https://doi.org/10.3390/ijms25137288
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