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. 1999 Aug 1;341(Pt 3):697–704. doi: 10.1042/0264-6021:3410697

Regulation of cerebellar Ins(1,4,5)P3 receptor by interaction between Ins(1,4,5)P3 and Ca2+.

J F Coquil 1, L Picard 1, J P Mauger 1
PMCID: PMC1220408  PMID: 10417334

Abstract

We have characterized in detail the Ca(2+)-dependent inhibition of [(3)H]Ins(1,4,5)P(3) ([(3)H]InsP(3)) binding to sheep cerebellar microsomes, over a short duration (3 s), with the use of a perfusion protocol. This procedure prevented artifacts previously identified in studies of this Ca(2+) effect. In a cytosol-like medium at pH 7.1 and 20 degrees C, a maximal inhibition of approx. 50% was measured. Both inhibition and its reversal were complete within 3 s. Ca(2+) decreased the affinity of the receptor for InsP(3) by approx. 50% (K(d) 146+/-24 nM at pCa 9 and 321+/-56 nM at pCa 5.3), without changing the total number of binding sites. Conversely, increasing the [(3)H]InsP(3) concentration from 30 to 400 nM tripled the IC(50) for Ca(2+) and decreased the maximal inhibition by 63%. This is similar to a partial competitive inhibition between InsP(3) binding and inhibitory Ca(2+) binding and is consistent with InsP(3) and Ca(2+) converting InsP(3) receptor into two different states with different affinities for these ligands. Mn(2+) and Sr(2+) also inhibited [(3)H]InsP(3) binding but were respectively only 1/10 and 1/200 as effective as Ca(2+). No inhibition was observed with Ba(2+). This selectivity is the same as that previously reported for the inhibitory Ca(2+) site of InsP(3)-induced Ca(2+) flux, suggesting that the same site is used by Ca(2+) to convert cerebellar InsP(3) receptor to a low-affinity state and to inhibit its channel activity. Our results also suggest a mechanism by which InsP(3) counteracts this Ca(2+)-dependent inhibition.

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Selected References

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