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. 1987 Nov 15;248(1):209–215. doi: 10.1042/bj2480209

Different effects of phorbol ester on angiotensin II- and stable GTP analogue-induced activation of polyphosphoinositide phosphodiesterase in membranes isolated from rat renal mesangial cells.

J Pfeilschifter 1, C Bauer 1
PMCID: PMC1148520  PMID: 2829820

Abstract

Pretreatment with pertussis toxin inhibits angiotensin II-induced activation of polyphosphoinositide phosphodiesterase in rat renal mesangial cells [Pfeilschifter & Bauer (1986) Biochem. J. 236, 289-294]. Furthermore, activation of protein kinase C by the phorbol ester 12-O-tetradecanoylphorbol 13-acetate (TPA) and by 1-oleoyl-2-acetylglycerol (OAG) abolishes angiotensin II-induced formation of inositol trisphosphate (IP3) in mesangial cells [Pfeilschifter (1986) FEBS Lett. 203, 262-266]. Using membrane preparations of [3H]inositol-labelled mesangial cells we tried to obtain further insight as to the step at which protein kinase C might interfere with the signal transduction mechanism in mesangial cells. Angiotensin II (100 nM) stimulates IP3 formation from membrane preparations of [3H]inositol-labelled mesangial cells with a half-maximal potency of 1.1 nM. The angiotensin II-induced formation of IP3 is enhanced by GTP. This effect of angiotensin II is completely blocked by the competitive antagonist [Sar1,Ala8]angiotensin II. Guanosine 5'-[gamma-thio]triphosphate (GTP gamma S) and guanosine 5'-[beta gamma-imido]triphosphate (Gpp[NH]p), non-hydrolysable analogues of GTP, stimulate IP3 production in the absence of angiotensin II with Kd values of 0.19 microM and 2.4 microM, respectively. Angiotensin II augments the increase in IP3 formation induced by GTP gamma S. However, when mesangial cells were pretreated with TPA there was a dose-dependent inhibition of the synergistic action of angiotensin II on GTP gamma S-induced IP3 production. Comparable results are obtained with OAG, while the non-tumour-promoting phorbol ester 4 alpha-phorbol 12,13-didecanoate is without effect. These results suggest that activation of protein kinase C in mesangial cells does not impair phosphoinositide hydrolysis by stable GTP analogues but somehow seems to interfere with the stimulatory interaction of the occupied angiotensin II receptor with the transducing G-protein.

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Selected References

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