Activation of protein kinase C by 1-beta-D-arabinofuranosylcytosine conjugates of phospholipid.

Kee Ho Lee, Yu Jin Jung, Chung Il Hong, Myung Haing Cho, Dong Hoon Bai, Sang Hoon Kim, Kang Yell Choi, Ju Hyun Yu, Chang Min Kim

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Abstract

1-beta-D-arabinofuranosylcytosine (ara-C) conjugates of phospholipid were shown to be highly antineoplastic against various tumor cells. In this study, we report that these conjugates are potent activators of protein kinase C (PKC, EC) in vitro. Although required Ca2+, PKC activation by the conjugates occurred even in the absence of phospholipid and diacylglycerol. Among the conjugates, 1-beta-D-arabino-furanosylcytosine 5'-diphosphate-rac-1-O-octadecyl-2-O-palmitoylglycerol [(ara-CDP-DL-PBA); ara-C conjugate of ether phospholipid], was employed to investigate its mode of activation, since ether phospholipid has been reported to be a regulator of the PKC. When PKC was activated by ara-CDP-DL-PBA, diacylglycerol enhanced its activity with 3-fold reduction of an apparent Ka value for ara-CDP-DL-PBA and no change in the Vmax. During the PKC activation by phosphatidylserine, ara-CDP-DL-PBA exhibited a synergistic effect on the activation. Studies on the relationship between the structures of ara-CDP-DL-PBA and their effects on PKC activity showed that phosphate group of ether lipid was important for its activation of PKC, and that conjugation of ara-C and ether lipid further enhanced the enzyme activity. These results suggest that the ara-C conjugate of phospholipid activates PKC in a co-operative manner with diacylglycerol and/or phosphatidylserine, however, the exact mechanism of the antineoplastic effect of ara-CDP-DL-PBA through PKC activation still remains speculative.

Original languageEnglish
Pages (from-to)193-199
Number of pages7
JournalInternational journal of oncology
Volume24
Issue number1
Publication statusPublished - 2004 Jan

All Science Journal Classification (ASJC) codes

  • Oncology
  • Cancer Research

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    Lee, K. H., Jung, Y. J., Hong, C. I., Cho, M. H., Bai, D. H., Kim, S. H., Choi, K. Y., Yu, J. H., & Kim, C. M. (2004). Activation of protein kinase C by 1-beta-D-arabinofuranosylcytosine conjugates of phospholipid. International journal of oncology, 24(1), 193-199.