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Indoxyl sulfate-induced epithelial-to-mesenchymal transition and apoptosis of renal tubular cells as novel mechanisms of progression of renal disease

Title
Indoxyl sulfate-induced epithelial-to-mesenchymal transition and apoptosis of renal tubular cells as novel mechanisms of progression of renal disease
Authors
Kim S.H.Yu M.-A.Ryu E.S.Jang Y.-H.Kang D.-H.
Ewha Authors
강덕희유은선유민아
SCOPUS Author ID
강덕희scopus; 유은선scopus; 유민아scopus
Issue Date
2012
Journal Title
Laboratory Investigation
ISSN
0023-6837JCR Link
Citation
vol. 92, no. 4, pp. 488 - 498
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Indoxyl sulfate (IS), one of the uremic toxins, is regarded to have a substantial role in the progression of chronic kidney disease (CKD). Epithelial-to-mesenchymal transition (EMT) and apoptosis of renal tubular cells are known to be the critical mechanisms of the development and aggravation of CKD. We investigated the effect of IS on EMT and apoptosis in renal proximal tubular cells, NRK-52E cells. IS significantly inhibited cell proliferation and induced cell migration with a morphological transition from cuboidal epithelial cells to spindle-shaped scattered fibroblast-like cells. IS downregulated the expressions of zonula occluden-1 and E-cadherin, whereas upregulated α-SMA expression at 48 h, which was blocked by a pretreatment of the organic anion transporter, probenecid. IS also induced apoptosis of NRK cells from a concentration of 25 μg/ml with an activation of ERK1/2 and p38 MAP kinase (MAPK). Pretreatment of ERK1/2 or p38 MAPK inhibitors, PD98059 or SB203580, resulted in no significant effect on IS-induced EMT, whereas it ameliorated IS-induced apoptosis of NRK cells. These findings suggested phenotypic transition and apoptosis as potential mechanisms of IS-induced renal damage and the differential role of MAPK activation in IS-induced EMT and apoptosis of renal tubular cells. © 2012 USCAP, Inc All rights reserved.
DOI
10.1038/labinvest.2011.194
Appears in Collections:
의과대학 > 의학과 > Journal papers
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