Expression of inducible nitric oxide synthase in macrophages inversely correlates with parasitism of lymphoid tissues in dogs with visceral leishmaniasis

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dc.contributor.authorSanches, Francoise P.
dc.contributor.authorTomokane, Thaise Y.
dc.contributor.authorDa Matta, Vania L. R.
dc.contributor.authorMarcondes, Mary [UNESP]
dc.contributor.authorCorbett, Carlos E. P.
dc.contributor.authorLaurenti, Marcia D.
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2015-03-18T15:55:52Z
dc.date.available2015-03-18T15:55:52Z
dc.date.issued2014-09-07
dc.description.abstractBackground: There are only a few studies reporting the role of nitric oxide metabolites for controlling macrophage intracellular parasitism, and these are controversial. Therefore, the present study aimed to evaluate the expression of inducible nitric oxide synthase (iNOS) in the lymph nodes and spleen of dogs affected by visceral leishmaniasis through immunohistochemistry and to determine its correlation with tissue parasite burden and serum interferon (IFN)-gamma levels. Twenty-eight dogs were selected and assigned to one of two groups, symptomatic (n = 18) and asymptomatic (n = 10), according to clinical status and laboratory evaluation. A negative control group (n = 6) from a non-endemic region for visceral leishmaniasis was included as well.Results: Parasite density (amastigotes/mm(2)) was similar between clinical groups in the lymph nodes (P = 0.2401) and spleen (P = 0.8869). The density of iNOS(+) cells was higher in infected dogs compared to controls (P < 0.05), without a significant difference in lymph node (P = 0.3257) and spleen (P = 0.5940) densities between symptomatic and asymptomatic dogs. A positive correlation was found between the number of iNOS(+) cells in lymph nodes and interferon-gamma levels (r = 0.3776; P = 0.0303), and there was a negative correlation between parasites and iNOS+ cell densities both in lymph nodes (r = -0.5341; P = 0.0034) and spleen (r = -0.4669; P = 0.0329).Conclusion: The negative correlation observed between tissue parasitism and the expression of iNOS may be a reflection of NO acting on the control of parasites.en
dc.description.affiliationUniv Sao Paulo, Fac Med, Dept Patol, Lab Patol Molestias Infecciosas, BR-01246903 Sao Paulo, Brazil
dc.description.affiliationUniv Estadual Paulista, Fac Med Vet, Dept Clin Cirurgia & Reprod Anim, Aracatuba, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Fac Med Vet, Dept Clin Cirurgia & Reprod Anim, Aracatuba, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipLIM50 HC-FMUSP
dc.description.sponsorshipIdFAPESP: 04/07965-2
dc.description.sponsorshipIdFAPESP: 12/50285-9
dc.format.extent7
dc.identifierhttp://dx.doi.org/10.1186/s13028-014-0057-z
dc.identifier.citationActa Veterinaria Scandinavica. London: Biomed Central Ltd, v. 56, 7 p., 2014.
dc.identifier.doi10.1186/s13028-014-0057-z
dc.identifier.fileWOS000342023100001.pdf
dc.identifier.issn0044-605X
dc.identifier.lattes1817946671090010
dc.identifier.urihttp://hdl.handle.net/11449/117337
dc.identifier.wosWOS:000342023100001
dc.language.isoeng
dc.publisherBiomed Central Ltd
dc.relation.ispartofActa Veterinaria Scandinavica
dc.relation.ispartofjcr1.497
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectVisceral leishmaniasisen
dc.subjectCanineen
dc.subjectNitric oxideen
dc.subjectImmunohistochemistryen
dc.subjectInfection controlen
dc.titleExpression of inducible nitric oxide synthase in macrophages inversely correlates with parasitism of lymphoid tissues in dogs with visceral leishmaniasisen
dc.typeArtigo
dcterms.rightsHolderBiomed Central Ltd
unesp.author.lattes1817946671090010
unesp.author.orcid0000-0001-6931-4479[4]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Medicina Veterinária, Araçatubapt
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Artigos - Clínica, Cirurgia e Reprodução Animal - FMVA