The effect of bradykinin on secretion of insulin, glucagon, and somatostatin from the perfused rat pancreas.
To evaluate the effect of bradykinin (BK) on rat islet alpha, beta, and delta cells, the rat pancreas was perfused in situ with BK (1 mumol/L) for 30 minutes via a cannula placed in the celiac artery. Insulin, glucagon, and somatostatin concentrations in the effluent were measured to determine the effect of BK on the secretion of these hormones. The BK concentration of the rat pancreas was also measured. Basal secretion of insulin, glucagon, and somatostatin in medium containing 6 mmol/L glucose was maintained at 6.5 +/- 0.5 ng/mL 124 +/- 8 pg/mL, and 511 +/- 22 pg/mL (n = 12), respectively. BK (1 mumol/L) induced a transient peak that was 3.7-fold of the baseline concentration within 3 minutes, followed by a sustained level that was approximately 50% higher than baseline. BK also transiently increased glucagon secretion with a peak that was 1.7-fold of the baseline concentration within 3 minutes, without a sustained secretion phase. BK caused a reduction in somatostatin secretion within 3 minutes to a level of 60% to 70% of the baseline concentration. The BK concentration of the rat pancreas was 3.42 +/- 1.45 micrograms/g protein (n = 5), which was approximately 3 mumol/L. We concluded that BK stimulated insulin secretion, transiently increased glucagon secretion, and decreased somatostatin secretion during the 30-minute perfusion of the rat pancreas.
Yang
C
C
Department of Veterinary Physiology and Pharmacology, Iowa State University, Ames 50011, USA.
Chao
J
J
Hsu
W H
WH
D000704:Analysis of Variance; D000818:Animals; D001920:Bradykinin / Q000494:pharmacology*; D005934:Glucagon / Q000378:metabolism*; D007328:Insulin / Q000378:metabolism*; D000078790:Insulin Secretion; D007515:Islets of Langerhans / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D007700:Kinetics; D008297:Male; D010477:Perfusion; D051381:Rats; D017207:Rats, Sprague-Dawley; D013004:Somatostatin / Q000378:metabolism*
D007328:Insulin; D013004:Somatostatin; D005934:Glucagon; D001920:Bradykinin