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. 1998 Aug 17;17(16):4695–4703. doi: 10.1093/emboj/17.16.4695

Receptor-oriented intercellular calcium waves evoked by vasopressin in rat hepatocytes.

T Tordjmann 1, B Berthon 1, E Jacquemin 1, C Clair 1, N Stelly 1, G Guillon 1, M Claret 1, L Combettes 1
PMCID: PMC1170798  PMID: 9707428

Abstract

Agonist-induced intracellular calcium signals may propagate as intercellular Ca2+ waves in multicellular systems as well as in intact organs. The mechanisms initiating intercellular Ca2+ waves in one cell and determining their direction are unknown. We investigated these mechanisms directly on fura2-loaded multicellular systems of rat hepatocytes and on cell populations issued from peripheral (periportal) and central (perivenous) parts of the hepatic lobule. There was a gradient in vasopressin sensitivity along connected cells as demonstrated by low vasopressin concentration challenge. Interestingly, the intercellular sensitivity gradient was abolished either when D-myo-inositol 1,4, 5-trisphosphate (InsP3) receptor was directly stimulated after flash photolysis of caged InsP3 or when G proteins were directly stimulated with AlF4-. The gradient in vasopressin sensitivity in multiplets was correlated with a heterogeneity of vasopressin sensitivity in the hepatic lobule. There were more vasopressin-binding sites, vasopressin-induced InsP3 production and V1a vasopressin receptor mRNAs in perivenous than in periportal cells. Therefore, we propose that hormone receptor density determines the cellular sensitivity gradient from the peripheral to the central zones of the liver cell plate, thus the starting cell and the direction of intercellular Ca2+ waves, leading to directional activation of Ca2+-dependent processes.

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Selected References

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