Prostaglandins and CGRP release from cardiac sensory nerves

Naunyn-Schmiedeberg's Archives of Pharmacology
A Franco-Cereceda

Abstract

(1) The possible influence of prostaglandins (PG) E1 and I2 as well as ischaemia, ouabain and bradykinin on the outflow of calcitonin gene-related peptide (CGRP)- and neuropeptide Y (NPY)-like immunoreactivity (LI) from the guinea-pig heart was studied in vitro. (2) Exposure to PGE1 (10(-5) M), but not PGI2 (10(-5) M), induced an increased outflow, suggesting release of CGRP-LI. PGE1 simultaneously increased the contractile force and heart rate while no effects were observed on perfusate volume or outflow of NPY-LI. PGI2 had no effect on contractile parameters or coronary flow. In separate experiments on capsaicin-pretreated animals, the stimulatory effects of PGE1 on heart rate and contractile force remained unchanged while no increased CGRP-LI outflow was detectable. (3) Ouabain, bradykinin and reperfusion after total stop-flow ischaemia was associated with an indomethacin-resistant increase in perfusate levels of CGRP-LI but not of NPY-LI. While ouabain markedly increased the contractile force, exposure to bradykinin or ischaemia did not induce any clear-cut changes in contractile force or heart rate. (4) Capsaicin-exposure evoked a markedly increased outflow of CGRP-LI but not of NPY-LI in combination with an increase in he...Continue Reading

Citations

Dec 25, 2010·Naunyn-Schmiedeberg's Archives of Pharmacology·Petra HartmannAndrea Szabó
Jan 5, 2002·European Journal of Pharmacology·H NawaY Kurosaki
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