PMID: 6162453Jun 15, 1980Paper

The ATP4- receptor of rat mast cells

The Biochemical Journal
S Cockcroft, B D Gomperts

Abstract

The concentration-dependence on exogenous ATP of activation and inhibition of mast-cell histamine secretion, phosphatidylinositol labelling and leakage of metabolites shows that all these functions are regulated by the free acid ATP4-. Maximal histamine secretion and phosphatidylinositol labelling occur with ATP4- at approx. 2 microM, but higher concentrations, which cause inhibition of secretion and phosphatidylinositol labelling, are required to maximize leakage of 32P-labelled metabolites. Both enhancement and inhibition of phosphatidylinositol labelling (due to low and high concentrations of ATP4- respectively) are rapid in onset; histamine secretion is characterized by a delay, especially at low concentrations of ATP4- (approx. 1 microM). Phosphatidylinositol labelling and histamine secretion are dependent on extracellular Ca2+. Metabolite leakage due to the presence of exogenous ATP4- is slow and does not require Ca2+. Of 18 analogues of ATP that were tested, only four were agonists for secretion, and only these four permitted leakage of 32P-labelled metabolites. It is argued that activation and inhibition of histamine secretion, phosphatidylinositol labelling and metabolite leakage are all initiated by ATP4- acting at th...Continue Reading

Citations

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