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. 2000 Oct 26;83(10):1394–1400. doi: 10.1054/bjoc.2000.1457

Expression of peroxisome proliferator-activated receptor (PPAR)γ in gastric cancer and inhibitory effects of PPARγ agonists

H Sato 1, S Ishihara 1, K Kawashima 1, N Moriyama 1, H Suetsugu 1, H Kazumori 1, T Okuyama 1, M A K Rumi 1, R Fukuda 1, N Nagasue 2, Y Kinoshita 1
PMCID: PMC2408786  PMID: 11044367

Abstract

Peroxisome proliferator-activated receptor (PPAR) γ is expressed in human colon cancer, prostate cancer and breast cancer cells, and PPARγ activation induces growth inhibition in these cells. PPARγ expression in human gastric cancer cells, however, has not been fully investigated. We report the PPARγ expression in human gastric cancer, and the effect of PPARγ ligands on proliferation of gastric carcinoma cell lines. Immunohistochemistry was used to demonstrate the presence of PPARγ protein in surgically resected specimens from well differentiated, moderately differentiated and poorly differentiated adenocarcinoma. We used reverse transcription-polymerase chain reaction and Northern and Western blot analyses to demonstrate PPARγ expression in four human gastric cancer cell lines. PPARγ agonists (troglitazone and 15-deoxy-Δ12,14-prostaglandin J2) showed dose-dependent inhibitory effects on the proliferation of the gastric cancer cells, and their effect was augmented by the simultaneous addition of 9-cis retinoic acid, a ligand of RXRα. Flow cytometry demonstrated G1 cell cycle arrest and a significant increase of annexin V-positive cells after treatment with troglitazone. These results suggest that induction of apoptosis together with G1 cell cycle arrest may be one of the mechanisms of the antiproliferative effect of PPARγ activation in human gastric cancer cells. © 2000 Cancer ResearchCampaign

Keywords: PPARγ, gastric cancer, growth inhibition, apoptosis

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Selected References

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