Title : Flavanones structure-related inhibition on TPA-induced tumor promotion through suppression of extracellular signal-regulated protein kinases: involvement of prostaglandin E2 in anti-promotive process.

Pub. Date : 2002 Oct

PMID : 12209884






5 Functional Relationships(s)
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1 TPA-induced mitogen activated protein kinases (MAPK) phosphorylation, ornithine decarboxylase (ODC), c-Jun, and cyclooxygenase 2 (COX-2) protein expressions in a time-dependent manner, and the maximal inductive time point is at 1 h for MAPK phosphorylation and 6 h for others. Tetradecanoylphorbol Acetate jun proto-oncogene Mus musculus
2 Flavanone, 2"-OH flavanone, 4"-OH flavanone, 6-OH flavanone showed the dose-dependent inhibition on TPA-stimulated MAPK phosphorylation, COX-2, ODC, c-Jun protein expressions. Tetradecanoylphorbol Acetate jun proto-oncogene Mus musculus
3 And, PD98059, a specific inhibitor of ERKs, inhibited TPA-induced MAPK phosphorylation, accompanied by decreasing COX-2, c-Jun, and ODC protein expression, and showed dose-dependent inhibition on TPA-induced proliferation in cells. Tetradecanoylphorbol Acetate jun proto-oncogene Mus musculus
4 These results demonstrated that PGE(2) is an important mediator in TPA-induced proliferation, and MAPK phosphorylation was located at the upstream of COX-2, c-Jun, and ODC gene expressions in TPA-induced responses. Tetradecanoylphorbol Acetate jun proto-oncogene Mus musculus
5 Furthermore, flavanone, 2"-OH flavanone, 4"-OH flavanone, 6-OH flavanone (100 microM) suppressed TPA-induced colony formation associated with blocking MAPK phosphorylation, ODC, c-Jun, and COX-2 proteins expression. Tetradecanoylphorbol Acetate jun proto-oncogene Mus musculus