Nascimento, Manuela Sales LimaAlbuquerque, Talyta Delfino Rolim deMatta, Maria Adelaide do ValleCaldas, Ivo SantanaDiniz, Lívia de FigueiredoSilva, André Talvani Pedrosa daBahia, Maria TerezinhaAndrade, Cléber Mesquita deGalvão, Lúcia Maria da CunhaCâmara, Antônia Cláudia Jácome daGuedes, Paulo Marcos da Matta2015-01-212015-01-212013NASCIMENTO, M. S. L. et al. Naturally Leishmania infantum-infected dogs display an overall impairment of chemokine and chemokine receptor expression during visceral leishmaniasis. Veterinary Immunology and Immunopathology, v. 153, p. 202-208, 2013. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0165242713000871>. Acesso em: 08 nov. 2014.0165-2427http://www.repositorio.ufop.br/handle/123456789/4303Dogs are the primary reservoir for Leishmania parasites. The immune response induced by Leishmania infantum infection in these animals has not been completely elucidated, and few studies have investigated the relationship between the expression levels of chemokines and chemokine receptors and the clinical status of dogs with canine visceral leishmaniasis (CVL). The aim of this study was to correlate the clinical status of naturally L. infantuminfected dogs (from rural areas of Mossoró city, State of Rio Grande do Norte, Brazil) with the expression levels of chemokines (ccl1, ccl2, ccl3, ccl4, ccl5, ccl17, ccl20, ccl24, ccl26, cxcl9, cxcl10) and chemokine receptors (cxcr3, ccr3, ccr4, ccr5, ccr6, ccr8) in the liver and spleen determined using real-time PCR. Twenty-one dogs were clinically evaluated and classified as asymptomatic (n = 11) or symptomatic (n = 10). Splenomegaly, weight loss and onychogryphosis were the most pronounced symptoms. In the liver, the mRNA expression levels of ccl1, ccl17, ccl26, ccr3, ccr4, ccr5, ccr6, and ccr8 were lower in symptomatic animals than in asymptomatic animals. Compared with uninfected animals, symptomatic dogs had lower expression levels of almost all molecules analyzed. Moreover, high clinical scores were negatively correlated with ccr5 and ccr6 expression and positively correlated with cxcl10 expression. We conclude that the impairment of the expression of chemokines and chemokine receptors results in deficient leukocyte migration and hampers the immune response, leading to the development of disease.en-USChemokinesChemokine receptorsPathogenesisClinical manifestationsDogArtigo publicado em periodicoO periódico Veterinary Immunology and Immunopathology concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3517810769762.https://doi.org/10.1016/j.vetimm.2013.02.015