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. 1986 Jul;376:359–375. doi: 10.1113/jphysiol.1986.sp016158

Dopamine, noradrenaline and isoprenaline: secretory and electrophysiological effects in vitro on mouse pancreas.

Z Berger, R Laugier
PMCID: PMC1182803  PMID: 2432233

Abstract

The amylase release from mouse pancreatic fragments was studied after dopamine (DA), and alpha- or beta-sympathomimetic agonist application. The electrical parameters of the acinar cell membrane were also monitored. Both DA (from 5 X 10(-6) to 10(-4) M) and beta-stimulants (isoprenaline from 5 X 10(-6) to 5 X 10(-5) M; noradrenaline from 3 X 10(-4) to 10(-3) M) evoked an increase in amylase release, while noradrenaline in alpha-receptor stimulating doses failed to have any effect. The stimulatory effect of DA was blocked by ganglion blockers (Arfonad 10(-5) M; pentamethonium 3 X 10(-5) M) in a competitive manner and a dual antagonism was observed with atropine (10(-7) M, 10(-9) M). An alpha-receptor antagonist (phentolamine 10(-5) M) and a beta-receptor antagonist (propranolol 10(-5) M) had no influence on the dopamine response. Moreover, the DA-induced stimulation was dependent on the presence of extracellular calcium. Perfusion with 10(-4) and 10(-3) M-DA or local application (from 77 micrograms to 4.3 mg), resulted in marked membrane depolarization with diminution of the input resistance. This effect was blocked by atropine (10(-5) M) and pentamethonium (10(-4) M), but not by propranolol (10(-5) M) or phentolamine (10(-5) M). The isoprenaline- (IP) and noradrenaline- (NA) induced increase in amylase release was competitively blocked by propranolol (10(-5) M) but not by phentolamine (10(-5) M). Atropine caused a dose-dependent (10(-7) M, 10(-6) M) decrease in the maximal response (non-competitive antagonism), while the ganglion blocker pentamethonium (10(-4) M) was without effect. NA caused membrane depolarization accompanied by a decrease in the input resistance after local application (from 77 micrograms to 1.6 mg). This effect persisted in the presence of 10(-5) M-phentolamine but was abolished by 10(-5) M-propranolol. IP perfusion (10(-4) and 10(-3) M) or local application (0.3 M; from 32 to 130 micrograms) caused the same electrical changes as those induced by NA and DA. The effect of IP persisted in the presence of 10(-5) M-phentolamine, 10(-4) M-pentamethonium and 10(-4) M-domperidone, but was abolished by propranolol (10(-5) M) and tetrodotoxin (5 X 10(-6) M) and markedly diminished by atropine (10(-5) M).(ABSTRACT TRUNCATED AT 400 WORDS)

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Selected References

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