Title : Peroxisome proliferator-activated receptor-beta/delta inhibits epidermal cell proliferation by down-regulation of kinase activity.

Pub. Date : 2005 Mar 11

PMID : 15632134






6 Functional Relationships(s)
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1 Intracellular phosphorylation analysis showed that phosphorylated PKCalpha and other kinases were lower in wild-type mouse skin treated with 12-O-tetradecanoylphorbol-13-acetate (TPA) as compared with PPARbeta-null mouse skin. Tetradecanoylphorbol Acetate peroxisome proliferator activator receptor delta Mus musculus
2 Intracellular phosphorylation analysis showed that phosphorylated PKCalpha and other kinases were lower in wild-type mouse skin treated with 12-O-tetradecanoylphorbol-13-acetate (TPA) as compared with PPARbeta-null mouse skin. Tetradecanoylphorbol Acetate peroxisome proliferator activator receptor delta Mus musculus
3 Lower ubiquitination of PKCalpha was found in TPA-treated PPARbeta-null skin as compared with wild-type, and inhibition of ubiquitin-dependent proteasome degradation prevented TPA-induced down-regulation of PKCalpha. Tetradecanoylphorbol Acetate peroxisome proliferator activator receptor delta Mus musculus
4 Lower ubiquitination of PKCalpha was found in TPA-treated PPARbeta-null skin as compared with wild-type, and inhibition of ubiquitin-dependent proteasome degradation prevented TPA-induced down-regulation of PKCalpha. Tetradecanoylphorbol Acetate peroxisome proliferator activator receptor delta Mus musculus
5 The activity of PKCalpha and downstream signaling kinases is enhanced, and expression of cyclooxygenase-2 (COX-2) is significantly greater, in PPARbeta-null mouse skin in response to TPA compared with wild-type mouse skin. Tetradecanoylphorbol Acetate peroxisome proliferator activator receptor delta Mus musculus
6 Inhibition of PKCalpha or COX-2 reduced cell proliferation in TPA-treated PPARbeta-null keratinocytes in a dose-dependent manner, whereas it only slightly influenced cell proliferation in wild-type keratinocytes. Tetradecanoylphorbol Acetate peroxisome proliferator activator receptor delta Mus musculus