Involvement of endogenous prostaglandin E2 in tubular epithelial regeneration through inhibition of apoptosis and epithelial-mesenchymal transition in cisplatin-induced rat renal lesions.

Abstract:

:In the kidney, prostaglandin (PG) E2 is the main PG, playing important roles in maintaining homeostasis or development of pathological settings. Roles of PGE2 in renal lesions remain to be clarified. The expression patterns of PGE2 synthesis enzymes such as cyclooxygenase (COX)-1, COX-2 and microsomal PGE synthase (mPGES)-1, and PGE2 receptors (EP2 and EP4) were examined in cisplatin-induced rat renal failure. The immunoexpressions for COX-1, mPGES-1 and EP4 receptor were increased exclusively in the affected renal tubules, but those of COX-2 and EP2 receptor were not detected; increased expression of COX-1 was confirmed at mRNA level. Using rat renal epithelial cell line (NRK-52E), the effects of PGE2 on cell proliferation were investigated. The addition of PGE2 or 11-deoxy-PGE1 (EP4 receptor agonist) to NRK-52E increased the cell number, indicating the effects of PGE2 via EP4 receptor. Furthermore, 11-deoxy-PGE1-treated NRK-52E cells underwent the G0/G1 arrest and decreased apoptosis. NRK-52E treated with transforming growth factor (TGF)-beta1, an inducer of epithelial-mesenchymal transition (EMT), in the presence of 11-deoxy-PGE1 decreased the mRNA expression of alpha-smooth muscle actin (a marker of myofibroblasts). Collectively, the present study shows that COX-1 plays more important roles than dose COX-2 in cisplatin-induced rat renal failure; the product, PGE2, may regulate renal epithelial regeneration via EP4 receptor through inhibition of apoptosis and EMT.

journal_name

Histol Histopathol

authors

Yamamoto E,Izawa T,Juniantito V,Kuwamura M,Sugiura K,Takeuchi T,Yamate J

doi

10.14670/HH-25.995

subject

Has Abstract

pub_date

2010-08-01 00:00:00

pages

995-1007

issue

8

eissn

0213-3911

issn

1699-5848

journal_volume

25

pub_type

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