Evaluation of mesenchymal cells and dapsone for the treatment of dermonecrotic wounds caused by Loxosceles laeta venom in rabbits

Autor: Guilherme de Caro Martins, Maira Souza Oliveira Barreto, Ana Flávia Machado Botelho, Conrado Gamba, Clara Guerra Duarte, Benito Soto-Blanco, Adriane Pimenta Costa-Val Bicalho, Geovanni Cassali, Alfredo Miranda de Goes, Carlos Delfin Chávez Olórtegui, Marília Martins Melo
Jazyk: English<br />Portuguese
Rok vydání: 2022
Předmět:
Zdroj: Ciência Animal Brasileira, Vol 23 (2022)
Druh dokumentu: article
ISSN: 1518-2797
1809-6891
Popis: This study aimed to evaluate the efficacy of mesenchymal stem cells (MSC), alone or associated with dapsone (DAP), in treating dermonecrotic wounds caused by Loxosceles laeta venom. Twenty-five male rabbits were distributed into five groups. Negative control received ultrapure water (C-), whilst all other groups were injected with 20 μg of L. laeta venom. After 4 hours, each group received one of the following treatments: PBS (C+), DAP, MSC, and DAP+MSC. Animals were evaluated daily and photographic records made for analysis of wound area. Twelve days after, animals were euthanized and skin samples removed for histological analysis. We observed that DAP showed the best percentage of wound contraction at day 3. In the treatments using MSCs, a negative value of wound contraction was observed for the isolated MSCs, as well as a lower contraction value for the association of the MSC + DAP when compared to PBS, probably, by the increase in initial inflammation after the application of stem cells, due to the fact that MSCs secrete a broad spectrum of bioactive molecules such as cytokines and growth factors that favor regeneration. Histologically, it was observed that animals of C+ showed extensive areas of necrosis, ulcers, neutrophilic infiltrate, and mineralization. Collagen deposition showed increase in MSC+DAP treatment, however vascularization remained unchanged. This is the first report using MSC and MSC+DAP as a treatment for cutaneous loxoscelism and more studies are needed to determine its use as an alternative therapy for dermonecrotic lesions caused by Loxosceles spider. Key words: loxoscelism; MSC; stem cells; spider venom; wound repair.
Databáze: Directory of Open Access Journals
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