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. 1995 May 23;92(11):4793–4797. doi: 10.1073/pnas.92.11.4793

Biological response to phorbol ester determined by alternative G1 pathways.

T S Huang 1, J Duyster 1, J Y Wang 1
PMCID: PMC41793  PMID: 7761402

Abstract

A plethora of extracellular signals is known to induce a common set of immediate early genes. The immediate early response, therefore, must not be sufficient to determine the biological outcome. An example of this is found with the phorbol ester 12-O-tetradecanoylphorbol 13-acetate (TPA). A potent activator of protein kinase C, TPA can either stimulate or inhibit cell proliferation, depending on the cell type. This cell context-dependent response to TPA is observed with two subclones of NIH 3T3 cells, the P- and the N-3T3 clones. TPA is a mitogen for the P-3T3 but an antimitogen for the N-3T3 cells. The immediate early pathway is activated by TPA in both cell types, indicating that this pathway alone does not activate DNA synthesis. The delayed induction of cyclin D1 expression by TPA is observed only in the P-3T3 cells, correlating with mitogenesis. N-Acetylcysteine does not affect the immediate early pathway but can inhibit the TPA-mediated induction of cyclin D1 and DNA synthesis. In the N-3T3 cells, TPA causes an inhibition of the cyclin E-associated kinase at the G1/S transition, correlating with growth inhibition. The growth-inhibitory activity of TPA is not affected by N-acetylcysteine. Thus, the two TPA-regulated G1 pathways can be distinguished by their sensitivity to N-acetylcysteine. These results demonstrate that TPA can activate alternative G1 pathways. Moreover, the selection of the alternative G1 pathways is determined by the cell context, which, in turn, dictates the biological response to TPA.

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