J Biol Chem. 2002 Feb 1;277(5):3776-83. Epub 2001 Nov 29.

Phorbol 12-myristate 13-acetate inhibits death receptor-mediated apoptosis in Jurkat cells by disrupting recruitment of Fas-associated polypeptide with death domain.External

Meng, X. W., Heldebrant, M. P., Kaufmann, S. H.,
--- - Division of Oncology Research, Department of Molecular Pharmacology, Mayo Clinic, Mayo Graduate School, Rochester, Minnesota 55905, USA.
Regulation of death receptor-mediated apoptosis is incompletely understood. Previous studies have demonstrated that phorbol 12-myristate 13-acetate (PMA), a protein kinase C activator, inhibits Fas (CD95)-mediated apoptosis in Jurkat (type II) cells but not SKW6.4 (type I) cells. In this study, we demonstrated that PMA also protects Jurkat cells from apoptosis induced by tumor necrosis factor-alpha and the tumor necrosis factor-alpha-related apoptosis-inducing ligand (TRAIL). Interestingly, PMA failed to protect Jurkat cells from apoptosis induced by other agents, including etoposide, camptothecin, and gamma-irradiation. Analysis of the initial events induced by agonistic anti-Fas antibodies revealed that PMA inhibited Fas binding to Fas-associated polypeptide with death domain (FADD) in Jurkat cells but not in SKW6.4 cells. Although the protein kinase inhibitor bisindoylmaleimide VIII increased apoptosis induced by agonistic anti-Fas antibody, tumor necrosis factor-alpha, and TRAIL, these effects were not observed with the protein kinase C inhibitor H7 and were not associated with increased FADD recruitment to Fas. These results indicate that PMA inhibits death signaling induced by a number of discrete receptors and suggest that the effects are mediated at the level of receptor-mediated adaptor molecule recruitment.
PMID: 11729181External
Arrow2 In vitro interaction Arrow2 In vivo interaction Arrow2 Characterization Arrow2 Functional role Arrow2 top
In vivo interaction
  Endogenous
expression
Overexpression DD1 DD2 Reference
Family DD1 DD2 Method Species Region Species Region
DD FADD Link Fas Co-immunoprecipitation Jurkat 11729181
DD FADD Link Fas Co-immunoprecipitation SKW6.4 11729181
(Link: click this icon to show interactions only between the two corresponding DDs)