RRC ID 42190
Author Azuma Y, Watanabe K, Date M, Daito M, Ohura K.
Title Induction of proliferation by 15-deoxy-delta12,14-prostaglandin J2 and the precursors in monocytic leukemia U937.
Journal Pharmacology
Abstract Peroxisome proliferator-activated receptor gamma (PPARgamma) is expressed in several human tumors including gastric, lung, colon, prostate and breast. However, the role of PPARgamma signals in leukemia is still unclear. The aim of this study is to evaluate the ability of 15-deoxy-Delta12,14-prostaglandin J2 (15dPGJ2), that is a ligand for PPARgamma, on proliferation of human leukemia cell line U937. 15dPGJ2 at 5 micromol/l stimulated the proliferation. In contrast, 15dPGJ2 at concentrations of >10 micromol/l inhibited the proliferation through the induction of apoptosis. PGD2, PGJ2 and Delta12-PGJ2 (DeltaPGJ2), those are precursors of 15dPGJ2, had similarly proliferative effects, whereas they showed antiproliferative effects at high concentrations. FACScan analysis revealed that PGD2 at 5 micromol/l, PGJ2 at 1 micromol/l, DeltaPGJ2 at 1 micromol/l and 15dPGJ2 at 5 micromol/l, all accelerated cell cycle progression. Immunoblotting analysis revealed that PGD2 at 5 micromol/l and 15dPGJ2 at 5 micromol/l inhibited the expression of phospho-p38, phospho-MKK3/MKK6 and phospho-ATF-2, and the expression of Cdk inhibitors including p18, p27. In contrast, PGJ2 at 1 micromol/l and DeltaPGJ2 at 1 micromol/l did not affect the expression of them. These results suggest that 15dPGJ2 and PGD2 may, through inactivation of the p38 MAPK pathway, inhibit the expression of Cdk inhibitors, leading to acceleration of proliferation.
Volume 71(4)
Pages 181-91
Published 2004-8-1
DOI 10.1159/000078084
PII 78084
PMID 15240994
MeSH Apoptosis Cell Division / drug effects Cells, Cultured Cyclin-Dependent Kinases / metabolism Dose-Response Relationship, Drug Humans Leukemia, Monocytic, Acute / pathology* Ligands Mitogen-Activated Protein Kinases / antagonists & inhibitors Prostaglandin D2 / analogs & derivatives Prostaglandin D2 / pharmacology* Receptors, Cytoplasmic and Nuclear / agonists* Transcription Factors / agonists* U937 Cells p38 Mitogen-Activated Protein Kinases
IF 1.615
Times Cited 7
Human and Animal Cells