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. 1987 Jun 15;244(3):647–653. doi: 10.1042/bj2440647

Homologous desensitization of substance-P-induced inositol polyphosphate formation in rat parotid acinar cells.

H Sugiya 1, K A Tennes 1, J W Putney Jr 1
PMCID: PMC1148045  PMID: 2451500

Abstract

Maximal concentrations of substance P and methacholine induced a rapid increase in [3H]inositol trisphosphate ([3H]IP3) formation. After about 1 min, the [3H]IP3 in the substance-P-treated cells ceased to increase further, whereas in the methacholine-treated cells [3H]IP3 continued to increase. Addition of methacholine to the substance-P-treated cells caused a rapid increase in [3H]IP3, whereas a second addition of a 10-fold excess of substance P had no effect. Pretreatment of cells with substance P, followed by removal of the substance P by washing, resulted in a decreased response to a second application of substance P. A similar protocol involving pretreatment with methacholine had no effect on subsequent responsiveness to substance P. Analysis of [3H]substance P binding to substance-P-treated cells indicated that the number of receptors for substance P was decreased, but the affinity of the receptors for substance P was unaffected. After substance P pretreatment, a prolonged incubation (2 h) restored responsiveness of the cells to substance P, measured as [3H]IP3 formation, and restored the number of binding sites to control values. These findings indicate that, in the rat parotid gland, substance P induces a homologous desensitization of its receptor, which involves a slowly reversible down-regulation or sequestration of substance-P-binding sites.

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Selected References

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