Function of Ca2+ in phosphatidylcholine-hydrolyzing phospholipase D activation in osteoblast-like cells

Haruhiko Tokuda, A. Suzuki, Y. Watanabe-Tomita, J. Shinoda, Y. Imamura, Y. Oiso, A. Igata, O. Kozawa

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3 Citations (Scopus)


We investigated the function of Ca2+ in the activation of phosphatidylcholine (PC)-hydrolyzing phospholipase D (PLD) in osteoblast-like MC3T3-E1 cells. Fetal calf serum (FCS) stimulated the formation of choline in a dose-dependent manner in the range between 0.6% and 10%. The effect of a combination of FCS and 12-O-tetradecanoylphorbol-13-acetate, a protein kinase C (PKC) activator, on the formation of choline was additive. Staurosporine, an inhibitor of protein kinases, enhanced the formation of choline induced by FCS, BAPTA/AM, a chelator of intracellular Ca2+, inhibited the formation of choline induced by FCS. The depletion of extracellular Ca2+ by EGTA markedly reduced the FCS-induced formation of choline, SK and F 96365, an inhibitor of receptor-operated Ca2+ entry, significantly inhibited the choline formation induced by FCS. On the other hand, nifedipine, an inhibitor of L-type voltage-dependent Ca2+ channels, had little effect on the choline formation, TMB-8, an inhibitor of Ca2+ mobilization from intracellular Ca2+ store, significantly inhibited FCS-induced choline formation, These results strongly suggest that Ca2+ mobilization, through both the influx via receptor-operated Ca2+ channel and the release from intracellular Ca2+ store, plays an important role in the activation of PLD in osteoblast-like cells.

Original languageEnglish
Pages (from-to)347-352
Number of pages6
Issue number4
Publication statusPublished - 10-1996
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Endocrinology, Diabetes and Metabolism
  • Physiology
  • Histology


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