Nascimento Manuela S L, Albuquerque Talyta D R, Do-Valle-Matta Maria A, Caldas Ivo S, Diniz Lívia F, Talvani André, Bahia Maria T, Andrade Cléber M, Galvão Lúcia M C, Câmara Antônia C J, Guedes Paulo M M
Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brazil.
Vet Immunol Immunopathol. 2013 Jun 15;153(3-4):202-8. doi: 10.1016/j.vetimm.2013.02.015. Epub 2013 Mar 5.
Dogs 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. infantum-infected 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.
狗是利什曼原虫寄生虫的主要宿主。婴儿利什曼原虫感染在这些动物中诱导的免疫反应尚未完全阐明,很少有研究调查趋化因子和趋化因子受体的表达水平与犬内脏利什曼病(CVL)犬的临床状况之间的关系。本研究的目的是将自然感染婴儿利什曼原虫的犬(来自巴西北里奥格兰德州莫索罗市农村地区)的临床状况与通过实时PCR测定的肝脏和脾脏中趋化因子(ccl1、ccl2、ccl3、ccl4、ccl5、ccl17、ccl20、ccl24、ccl26、cxcl9、cxcl10)和趋化因子受体(cxcr3、ccr3、ccr4、ccr5、ccr6、ccr8)的表达水平相关联。对21只犬进行临床评估并分为无症状(n = 11)或有症状(n = 10)。脾肿大、体重减轻和爪甲肥厚是最明显的症状。在肝脏中,有症状动物的ccl1、ccl17、ccl26、ccr3、ccr4、ccr5、ccr6和ccr8的mRNA表达水平低于无症状动物。与未感染动物相比,有症状的犬几乎所有分析分子的表达水平都较低。此外,高临床评分与ccr5和ccr6表达呈负相关,与cxcl10表达呈正相关。我们得出结论,趋化因子和趋化因子受体表达的受损导致白细胞迁移不足并阻碍免疫反应,从而导致疾病的发展。
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