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. 1993 Jun 1;292(Pt 2):401–408. doi: 10.1042/bj2920401

Potentiation by cholera toxin of bradykinin-induced inositol phosphate production in the osteoblast-like cell line MC3T3-E1.

Y Banno 1, T Sakai 1, T Kumada 1, Y Nozawa 1
PMCID: PMC1134223  PMID: 8389133

Abstract

Cells of the osteoblastic cell line MC3T3-E1 were shown to contain at least three phosphatidylinositol-specific phospholipase C (PI-PLC) isoenzymes (PLC-beta, PLC-gamma and PLC-delta) by Western blotting analysis with various anti-PLC antibodies. Stimulation of inositol phosphate production in MC3T3-E1 cells by bradykinin (BK) occurred via a GTP-binding protein. Inositol phosphate formation on stimulation by BK was not affected by pretreatment with pertussis toxin, whereas it was potentiated by cholera toxin pretreatment. Elevation of cellular cyclic AMP levels by brief pretreatment with dibutyryl cyclic AMP or forskolin failed to enhance the BK-mediated generation of inositol phosphates, but long-term preincubation with these agents partially mimicked the action of the cholera toxin. Cholera toxin also caused an increase in BK receptor number. Cycloheximide, a protein biosynthesis inhibitor, prevented the potentiating actions of the cholera toxin and the cyclic AMP-elevating agents on BK-induced inositol phosphate production, and also inhibited the increase in BK receptor number. The specific binding of [3H]BK to the whole MC3T3-E1 cells in the presence or absence of cholera toxin was completely inhibited by the B2 BK receptor antagonist D-Arg[Hyp3,Thi5,8,D-Phe7]BK, but not by the B1 BK receptor agonist des-Arg9-BK. These data suggest that the activation of PI-PLC induced by cholera toxin in BK-stimulated MC3T3-E1 cells was caused by an enhancement of the synthesis of BK receptor protein(s), at least part of which was mediated by a sustained increase in the intracellular level of cyclic AMP.

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Selected References

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