Differential modulation of PPARalpha and gamma target gene expression in the liver and kidney of rats treated with aspirin.
Aspirin modified peroxisomal enzymatic activities both in the liver and renal cortex of rats, producing typical effects of peroxisomal proliferators (PPs). Although similar increments in beta-oxidation system and catalase activities were observed in both organs, induction of mRNA-Cyp4a10 and mRNA-FAT/CD36, target genes for peroxisome proliferator-activated receptors alpha (PPARalpha) and gamma (PPARgamma), respectively, was only present in the liver. There was no effect on liver mRNA-PPARalpha, while mRNA-PPARgamma was down-regulated, probably as a result of enzymatic inhibition of cyclooxygenases (COXs) by aspirin which has been shown to decrease the levels of PGJ2 and its metabolites, known as strong endogenous ligands for PPARgamma. Typical PP alterations in cell replication and apoptosis were not found during aspirin treatment or after withdrawal, suggesting that peroxisome proliferation occurs without inducing cell cycle alterations. Probably, the synergic action of both PPARalpha and PPARgamma receptors might reduce the impact on cell proliferation and apoptosis.
Fidaleo
Marco
M
Department of Cellular and Developmental Biology, University of Rome La Sapienza, P.le Aldo Moro 5, 00185 Rome, Italy. marco.fidaleo@uniroma1.it
Berardi
Emanuele
E
Sartori
Claudia
C
D000818:Animals; D001241:Aspirin / Q000494:pharmacology*; D051545:Cyclooxygenase 1 / Q000378:metabolism; D051546:Cyclooxygenase 2 / Q000378:metabolism; D015870:Gene Expression / Q000187:drug effects*; D007672:Kidney Cortex / Q000187:drug effects* / Q000201:enzymology / Q000378:metabolism; D008099:Liver / Q000187:drug effects* / Q000201:enzymology / Q000378:metabolism; D008297:Male; D047493:PPAR alpha / Q000819:agonists / Q000235:genetics*; D047495:PPAR gamma / Q000819:agonists / Q000235:genetics*; D020025:Peroxisome Proliferators / Q000494:pharmacology*; D051381:Rats; D017208:Rats, Wistar; D013997:Time Factors
D047493:PPAR alpha; D047495:PPAR gamma; D020025:Peroxisome Proliferators; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; C489691:Ptgs2 protein, rat; D001241:Aspirin