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Adenovirus-mediated P311 inhibits TGF-β1-induced epithelial-mesenchymal transition in NRK-52E cells via TGF-β1-Smad-ILK pathway.

Abstract
P311, a highly conserved 8-kDa intracellular protein, has been indicated as an important factor in myofibroblast transformation and in the progression of fibrosis. In the present study, we constructed a recombinant adenovirus vector of p311 (called Ad-P311) and transferred it into rat renal proximal tubular epithelial cells (NRK-52E) to explore the effect of P311 on epithelial-mesenchymal transition (EMT) of NRK-52E cells induced by TGF-β1 and to elucidate its underlying mechanism against EMT. After successfully construction of Ad-P311 and transfer into NRK-52E cells, the proliferation and growth of P311-expressing cells was detected by MTT assay. TGF-β1 was used to induce NRK-52E cells and Western blot analysis was used to examine the EMT markers (E-cadherin and α-smooth muscle actin (α-SMA)), signal transducers (p-Smad2/3 and Smad7). Integrin Linked Kinase (ILK) as a key intracellular mediator that controls TGF-β1-induced-EMT was also assayed by Western blot analysis. The results showed that P311 transfection could significantly inhibit the proliferation and growth of TGF-β1 induced NRK-52E cells. The results also showed that TGF-β1 could induce EMT in NRK-52E cells through Smad-ILK signaling pathway with an increase in α-SMA, pSmad2/3 and ILK expression, and a decrease in E-cadherin and Smad7 expression. However, P311 efficiently blocked Smad-ILK pathway activation and attenuated all these EMT changes induced by TGF-β1. These findings suggest that P311 might be involved in the pathogenesis of renal fibrosis by inhibiting the EMT process via TGF-β1-Smad-ILK pathway. P311 might be a novel target for the control of renal fibrosis and the progression of CKD.
AuthorsFanghua Qi, Pingping Cai, Xiang Liu, Min Peng, Guomin Si
JournalBioscience trends (Biosci Trends) Vol. 9 Issue 5 Pg. 299-306 (Oct 2015) ISSN: 1881-7823 [Electronic] Japan
PMID26559022 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Nerve Tissue Proteins
  • Nrep protein, rat
  • Smad Proteins
  • Tgfb1 protein, rat
  • Transforming Growth Factor beta1
  • integrin-linked kinase
  • Protein Serine-Threonine Kinases
Topics
  • Adenoviridae
  • Animals
  • Epithelial-Mesenchymal Transition
  • Genetic Vectors
  • HEK293 Cells
  • Humans
  • Nephrosclerosis (etiology, metabolism)
  • Nerve Tissue Proteins (genetics, metabolism)
  • Protein Serine-Threonine Kinases (metabolism)
  • Rats
  • Smad Proteins (metabolism)
  • Transforming Growth Factor beta1 (metabolism)

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