We previously demonstrated that activation of v-ABL protein tyrosine kinase resulted in suppression of apoptosis following interleukin-3 removal using an interleukin-3-dependent haemopoietic cell line transfected with a temperature-sensitive mutant of the v-abl oncoprotein (IC.DP). Cellular signalling events associated with the activation of v-ABL included increased levels of sn-1,2-diacylglycerol, an activator of protein kinase C. Calphostin C, a PKC inhibitor, restored apoptosis to interleukin-3-deprived IC.DP cells expressing active v-ABL. However, chronic exposure to the phorbol ester, 12-O-tetradecanoyl phorbol 13-acetate to downregulate protein kinase C did not attenuate the survival of IC.DP cells expressing active v-ABL. Translocation of a classical protein kinase C isozyme(s) to the nuclear fraction was observed 6 hours after activation of v-ABL, when nuclear protein kinase C activity was increased approximately 2-fold. The protein kinase C isozyme responsible, which was only partially downregulated by 12-O-tetradecanoyl phorbol 13-acetate, was identified as protein kinase C β(II). This translocation of protein kinase C β(II) to the nucleus was inhibited by calphostin C. Taken together, these results suggest that nuclear translocation and activation of PKCβ(II) may play a role in v-ABL-mediated suppression of apoptosis.
|Number of pages||8|
|Journal||Journal of Cell Science|
|Publication status||Published - 1 Jul 1995|
Evans, C. A., Lord, J. M., Owen-Lynch, P. J., Johnson, G., Dive, C., & Whetton, A. D. (1995). Suppression of apoptosis by v-ABL protein tyrosine kinase is associated with nuclear translocation and activation of protein kinase C in an interleukin-3-dependent haemopoietic cell line. Journal of Cell Science, 108(7), 2591-2598.