New Advancements in the Field of Leishmaniasis

A special issue of Microorganisms (ISSN 2076-2607). This special issue belongs to the section "Parasitology".

Deadline for manuscript submissions: closed (30 April 2024) | Viewed by 2222

Special Issue Editors


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Guest Editor
Vector Biology Section, Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, The National Institutes of Health, Rockville, MD, USA
Interests: vector-pathogen-host interactions and their implications for human disease
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Guest Editor
Département de Pathologie et Microbiologie, Faculté de Médecine Vétérinaire, Université de Montréal, Saint-Hyacinthe, QC, Canada
Interests: asymptomatic infection, and monitoring treatment; drug resistance

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Guest Editor
Vector Molecular Biology Section, Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, The National Institutes of Health, Rockville, MD, USA
Interests: vector-host-pathogen interactions focused on anthroponotic visceral leishmaniasis; preclinical animal models of sand fly-initiated VL to investigate the host immune response following transmission of Leishmania by bite, and how these events govern disease pathogenesis

Special Issue Information

Dear Colleagues,

Today, an estimated 700,000 to 1 million new cases of Leishmaniasis still occur annually, with a consequent significant disease burden. More than 100 years after the identification of the etiologic agent, protozoan Leishmania parasites (around 20 species associated with human disease to date), the chemotherapy agents available in the clinic settings are limited and “outdated”, and there is still no vaccine approved for human use. This is due to socio-geographic reasons—Leishmaniasis is a Neglected Tropical Disease, disproportionally affecting low-income populations—but not only. We still do not understand completely the determinants of parasite transmission and disease, probably due to the epidemiological complexity recognized in the context of Vector-Borne diseases. There is, consequently, the need, not only to better understand the individual parasite-vector, vector-host, and host-parasite interfaces in Leishmaniasis, but also to integrate them—looking at them as a whole.

In line with this, the aim of this Special Issue is to compile studies that describe new advances in the field of Leishmaniasis, either focusing individually on the Leishmania-sand fly or Leishmania-host interfaces (in line with the scope of Microorganisms), or on the integration of the vector-host-pathogen triad. Original research articles and reviews are welcome.

Overall, topics include, but are not limited to:

  • Determinants of vector competence;
  • The development of Leishmania parasites in the sandfly midgut;
  • The characteristics of the infectious inoculum at the time of transmission;
  • Parasite tissue tropism in the host;
  • Determinants of infection in asymptomatic versus disease conditions;
  • Developments in in vitro and animal models of Leishmaniasis;
  • New anti-Leishmania drug targets;

We look forward to receiving your contributions.

Dr. Pedro Cecílio
Dr. Ana Victoria Ibarra-Meneses
Dr. Eva Iniguez
Guest Editors

Manuscript Submission Information

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Keywords

  • Leishmaniasis
  • Leishmania
  • sand flies
  • parasite development
  • parasite transmission
  • parasite tropism
  • asymptomatic infection
  • determinants of infection/pathogenicity

Published Papers (2 papers)

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Research

20 pages, 13915 KiB  
Article
Canine Visceral Leishmaniasis: A Histological and Immunohistochemical Study of Fibropoiesis in Chronic Interstitial Pneumonitis
by Frederico C. Gonçalves, Ramon de Alencar Pereira, Adriano Francisco Alves, Aldair Pinto Woyames Junio, Ricardo T. Fujiwara, David M. Mosser, Helida Monteiro Andrade, Geovanni D. Cassali, Enio Ferreira and Wagner Luiz Tafuri
Microorganisms 2024, 12(5), 941; https://doi.org/10.3390/microorganisms12050941 - 7 May 2024
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Abstract
We studied some fibrotic aspects of chronic interstitial pneumonitis in the lungs of dogs infected with Leishmania infantum. The lungs of eleven naturally infected dogs, twelve experimentally infected with two distinct strains of L. infantum (BH401 and BH46), and six uninfected (controls) [...] Read more.
We studied some fibrotic aspects of chronic interstitial pneumonitis in the lungs of dogs infected with Leishmania infantum. The lungs of eleven naturally infected dogs, twelve experimentally infected with two distinct strains of L. infantum (BH401 and BH46), and six uninfected (controls) dogs, were analyzed by histological, parasitological, and immunohistochemical studies. Conventional histology (HE), collagen deposition (Gomori’s silver staining for reticulin collagen fibers), and immunohistochemistry for myofibroblast characterization were carried out based on the cellular expression of alpha-smooth muscle actin, vimentin, cytokeratin, E-cadherin, snail antigen homologue 1 (SNAI1) (Snail), and the cytokine expression of transforming growth factor-beta (TGF-β). Parasitological screening was carried out using conventional polymerase chain reaction (PCR) and the immunohistochemical reaction of streptavidin–peroxidase for visualizing Leishmania amastigotes. Dogs naturally infected with L. infantum and experimentally infected with L. infantum BH401 strains showed intense interstitial pneumonitis characterized by thickening of the alveolar septa as a consequence of an intense diffuse and focal (plaques) chronic exudate of mononuclear cells associated with fibrogenesis. The expression of alpha-actin, vimentin, and TGF-β was higher in the lung interstitium of all infected dogs than in the other two groups (BH46 strain and controls). Moreover, in both the naturally and experimentally infected dog (BH401 strain) groups, the expression of Snail was moderate to intense in contrast to the other groups. Based on these immunohistochemical results, we concluded that mesenchymal cells are active in promoting changes in the extracellular matrix in the lungs of dogs naturally and experimentally infected with L. infantum, but it depends on the virulence of the parasite. Full article
(This article belongs to the Special Issue New Advancements in the Field of Leishmaniasis)
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13 pages, 2630 KiB  
Article
Experimental Susceptibility of Nyssomyia antunesi and Lutzomyia longipalpis (Psychodidae: Phlebotominae) to Leishmania (Viannia) lainsoni and L. (V.) lindenbergi (Trypanosomatidae: Leishmaniinae)
by Yetsenia del Valle Sánchez Uzcátegui, Fernando Tobias Silveira, Thais Gouvea de Morais, Rodrigo Ribeiro Furtado, Thiago Vasconcelos dos Santos and Marinete Marins Póvoa
Microorganisms 2024, 12(4), 809; https://doi.org/10.3390/microorganisms12040809 - 17 Apr 2024
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Abstract
The present work assessed the experimental susceptibility of Nyssomyia antunesi and Lutzomyia longipalpis to Leishmania (Viannia) lainsoni and L. (V.) lindenbergi. A L. (Leishmania) chagasiLu. longipalpis combination was used as a susceptible control. Wild-caught [...] Read more.
The present work assessed the experimental susceptibility of Nyssomyia antunesi and Lutzomyia longipalpis to Leishmania (Viannia) lainsoni and L. (V.) lindenbergi. A L. (Leishmania) chagasiLu. longipalpis combination was used as a susceptible control. Wild-caught Ny. antunesi and laboratory-bred Lu. longipalpis were membrane-fed on blood with a 5 × 106/mL log-phase promastigote culture suspension and dissected on days 2 and 8 post-blood meal (pbm) for analysis focused on the assessment of parasitoses, as well as placement and promastigote morphotyping. Survival curves were constructed. In all combinations, promastigotes were observed on day 8 pbm. For both Leishmania species, in Lu. longipalpis, the presence of parasites was observed up to the stomodeal valve, while in Ny. antunesi, the presence of parasites was observed up to the cardia. There were no significant differences in parasitosis between L. (V.) lainsoni and L. (V.) lindenbergi in either Ny. antunesi or Lu. longipalpis. Six morphological promastigote forms were distinguished in Giemsa-stained gut smears. The survival curves of all combinations decreased and were affected differently by several Lu. longipalpis–parasite combinations, as well with Lu. longipalpis–uninfected blood. These findings stress Lu. longipalpis as experimentally susceptible to Leishmania spp. and suggest the putative susceptibility of Ny. antunesi to L. (V.) lainsoni and L. (V.) lindenbergi. Full article
(This article belongs to the Special Issue New Advancements in the Field of Leishmaniasis)
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