Synergism between androgens and protein kinase-C on androgen-regulated gene expression

Autor: de Ruiter, P.E., Teuwen, R., Trapman, J., Dijkema, R, Brinkmann, A.O.
Zdroj: Molecular and Cellular Endocrinology; April 1995, Vol. 110 Issue: 1-2 pR1-R6, 6p
Abstrakt: Androgen (R1881) induced transcriptional activity of the human androgen receptor, stably expressed in CHO cells, can be stimulated an extra 2-fold by the addition of the protein kinase C activator, 4β-phorbol 12-myristate 13-acetate (PMA). This extra stimulation is not observed when the protein kinase A activator bromoadenosine 3′:5′-cyclic monophosphate (8-BrcAMP) is used. The transcriptional activity was measured using a reporter plasmid containing the MMTV-promoter, coupled to the luciferase gene. The effect of PMA on R1881-induced transcription was not due to a higher expression level of the androgen receptor. Also, no extra phosphorylation of the androgen receptor could be measured after incubation with PMA. When GRE-tk-LUC and PSA-LUC reporters were used, the synergistic effect of PMA could not be observed. The findings on the composite MMTV-LTR promoter can be explained by either a direct synergistic interaction between occupied AP-1 like responsive elements and the androgen receptor or via an unknown transcription factor activated by the PKC pathway and interacting with the androgen receptor.
Databáze: Supplemental Index
Externí odkaz: