Infecção murina por Leishmania (Viannia) braziliensis: modelo em camundongos deficientes em interferon gama, fagócito oxidase ou óxido nítrico sintase induzida
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2015-08-05
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Universidade Federal de Goiás
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Leishmaniasis are zoonoses present in several countries, being Leishmania (Viannia) braziliensis the main parasite that causes localized cutaneous (LCL) and / or mucous leishmaniasis (LM) in Brazil. It is not clear yet which factors favor the development of the mucosal form of the disease. The aim of this study was to evaluate the profile of experimental leishmaniasis in wild type mice and mice lacking the IFN, inos or gp91phox genes, after infection with L. (V.) braziliensis amastigotes isolated from patients with LCL or LM. Mice were inoculated with different amount of amastigote parasites in the foot paw and lesion development was measured weekly. Histopathological analyses were performed in hematoxilin eosin stained slides. The number of parasites present in the infected foot paw, lymph node and spleen during infection was estimated by the limiting dilution assay. It was observed that IFNγ or Phox KO mice infected with amastigotes isolated from LCL patients develop lesion earlier than mice infected with amastigotes from LM patients. iNOS KO mice infected with 1000 amastigotes isolated from LM patients developed greater lesion and more severe inflammation than mice infected with parasites from LCL at the 5th week. The IFNγ, iNOS and gp91phox mice had similar parasite number in the infected foot paw after infection with LM or LCL parasites .The parasite burden in lymph node and spleen was higher after infection with parasites from LM than LCL patients. The low ability of human macrophages to produce sufficient amount of NO can favor survive of LM parasites. Additionally, the increased ability of LM parasite to disseminate will facilitate migration to mucosal tissue to promote the mucosal disease.
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GOMES, Clayson Moura. Infecção murina por Leishmania (Viannia) braziliensis: modelo em camundongos deficientes em interferon gama, fagócito oxidase ou óxido nítrico sintase induzida. 2015. 105 f. Tese (Mestrado em Medicina Tropical e Saúde Publica) - Universidade Federal de Goiás, Goiânia, 2015.