Vitamin D deficiency contributes to vascular damage in sustained ischemic acute kidney injury

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Arquivos
art_BRAGANCA_Vitamin_D_deficiency_contributes_to_vascular_damage_in_2016.PDF (5.37 MB)
Citações na Scopus
39
Tipo de produção
article
Data de publicação
2016
DOI
Scopus
Web of Science
PubMed
Título da Revista
ISSN da Revista
Título do Volume
Editora
WILEY-BLACKWELL
Autores
MEHROTRA, Purvi
BASILE, David P.
Citação
PHYSIOLOGICAL REPORTS, v.4, n.13, article ID e12829, 13p, 2016
Projetos de Pesquisa
Unidades Organizacionais
Fascículo
Resumo
Reductions in renal microvasculature density and increased lymphocyte activity may play critical roles in the progression of chronic kidney disease (CKD) following acute kidney injury (AKI) induced by ischemia/reperfusion injury (IRI). Vitamin D deficiency is associated with tubulointerstitial damage and fibrosis progression following IRI-AKI. We evaluated the effect of vitamin D deficiency in sustained IRI-AKI, hypothesizing that such deficiency contributes to the early reduction in renal capillary density or alters the lymphocyte response to IRI. Wistar rats were fed vitamin D-free or standard diets for 35days. On day 28, rats were randomized into four groups: control, vitamin D deficient (VDD), bilateral IRI, and VDD+IRI. Indices of renal injury and recovery were evaluated for up to 7days following the surgical procedures. VDD rats showed reduced capillary density (by cablin staining), even in the absence of renal I/R. In comparison with VDD and IRI rats, VDD+IRI rats manifested a significant exacerbation of capillary rarefaction as well as higher urinary volume, kidney weight/body weight ratio, tissue injury scores, fibroblast-specific protein-1, and alpha-smooth muscle actin. VDD+IRI rats also had higher numbers of infiltrating activated CD4(+) and CD8(+) cells staining for interferon gamma and interleukin-17, with a significant elevation in the Th17/T-regulatory cell ratio. These data suggest that vitamin D deficiency impairs renal repair responses to I/R injury, exacerbates changes in renal capillary density, as well as promoting fibrosis and inflammation, which may contribute to the transition from AKI to CKD.
Palavras-chave
Acute kidney injury, CD4(+) lymphocytes, CD8(+) lymphocytes, cytokines, ischemia reperfusion injury, renal microvascular density, T-reg cells, vitamin D deficiency
URI
https://observatorio.fm.usp.br/handle/OPI/16080
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Coleções
Artigos e Materiais de Revistas Científicas - FM/MCM
Artigos e Materiais de Revistas Científicas - LIM/12
Artigos e Materiais de Revistas Científicas - ODS/03