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- W2040289008 abstract "We previously reported that pertussis toxin-sensitive GTP-binding protein is involved in prostaglandin F2 alpha (PGF2 alpha)-induced phosphoinositide (PI) hydrolysis in osteoblast-like MC3T3-E1 cells [Miwa et al. (1990): Biochem Biophys Res Commun 171:1229-1235]. In the present study, we investigated the mechanism of PGF2 alpha-induced Ca2+ influx in MC3T3-E1 cells. PGF2 alpha-induced formation of total inositol phosphates (IPs) was markedly reduced by the depletion of extracellular Ca2+ with EGTA. On the other hand, the depletion of extracellular Ca2+ had little effect on PGF2 alpha-induced inositol 1,4,5-trisphosphate formation. PGF2 alpha stimulated 45Ca2+ influx dose dependently, attaining a maximum effect at 10 nM. Dose of PGF2 alpha above 10 nM caused less than maximal stimulation. Genistein, an inhibitor of protein tyrosine kinase, which by itself had little effect on 45Ca2+ influx, significantly suppressed the PGF2 alpha-induced 45Ca2+ influx in a dose-dependent manner in the range between 1 micrograms/ml and 0.1 mg/ml. Sodium orthovanadate, an inhibitor of protein tyrosine phosphatases, enhanced the PGF2 alpha-induced 45Ca2+ influx. Genistein also suppressed the PGF2 alpha-induced total IPs formation dose dependently in the range between 1 micrograms/ml and 0.1 mg/ml. However, it had little effect on the PGF2 alpha-induced inositol 1,4,5-trisphosphate formation. The pretreatment with pertussis toxin had little effect on the PGF2 alpha-induced 45Ca2+ influx. These results strongly suggest that PGF2 alpha stimulates Ca2+ mobilization from extracellular space and PI hydrolysis via independent pathways in osteoblast-like cells, and the PGF2 alpha-induced Ca2+ influx is regulated by protein tyrosine kinase, resulting in the promotion of PI hydrolysis." @default.
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- W2040289008 date "1994-04-01" @default.
- W2040289008 modified "2023-09-26" @default.
- W2040289008 title "Effect of prostaglandin F2α on Ca2+ influx in osteoblast-like cells: Function of tyrosine kinase" @default.
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- W2040289008 doi "https://doi.org/10.1002/jcb.240540416" @default.
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