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PMID |
Sentence |
1 |
3050530
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We now report that human pancreatic amylin and rat CGRP-1 are potent inhibitors of both basal and insulin-stimulated rates of glycogen synthesis in stripped rat soleus muscle in vitro.
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2 |
2227123
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Moreover, although intravenous injection of CGRP (5.67 nmol/kg) elicited a significant increase in plasma epinephrine and norepinephrine concentrations, concomitant administration of epinephrine and norepinephrine, inducing a more prominent rise in plasma catecholamines than those induced by CGRP, affected neither plasma glucose nor insulin levels.
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3 |
2227123
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Finally, plasma insulin levels obtained by simulating CGRP-induced changes in plasma glucose or glucose plus catecholamine levels by infusion of glucose or glucose plus catecholamines were not different from those induced by CGRP injection.
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4 |
2227123
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These results suggest that CGRP has a hyperglycemic action that is not mediated by sympathetic outflow in conscious rats, and inhibition of insulin secretion, if any, does not play a major role in this hyperglycemic action of CGRP.
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5 |
2227135
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During hyperinsulinemic glucose-clamp studies, intravenous infusion of calcitonin gene-related peptide (CGRP) in rats antagonized the ability of insulin to stimulate peripheral glucose disposal by 52% (196 +/- 7.2 vs. 105 +/- 10.5 mumol.kg-1.min-1, P less than 0.05) and to inhibit hepatic glucose output by 54% (P less than 0.01).
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6 |
2227135
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CGRP also inhibited the in vitro effects of insulin to stimulate hexose uptake in cultured BC3H1 myocytes at all insulin concentrations studied.
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7 |
1966731
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Calcitonin gene-related peptide (CGRP) is an intrapancreatic neuropeptide that is known to inhibit glucose-stimulated insulin secretion in rats.
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8 |
1966731
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It was found that insulin secretion stimulated by glucose (8.3 mM) was inhibited by 77% by CGRP at 10(-6) M (p less than 0.001) and by 48% by the peptide at 10(-7) M (p less than 0.05).
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9 |
1999269
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Like CGRP, IAPP antagonizes the action of insulin mainly at the level of muscle glycogen synthesis, but the levels required for this effect seem to be considerably higher than reported circulating levels.
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10 |
1541236
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Rat calcitonin gene-related peptide (CGRP), which has sequence homology with IAPP and has been reported to inhibit insulin action, was also administered.
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11 |
1541236
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Therefore, IAPP directly reduced only the insulin-mediated GU in the skeletal muscle, and this effect of IAPP occurred at the same dose as that of CGRP.
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12 |
1541237
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Intravenous injection of rat CGRP caused a significant increase in plasma glucose concentration with a simultaneous increase in plasma insulin levels, whereas neither IAPP-NH2 nor IAPP-COOH had any effect.
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13 |
1541237
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Moreover, intravenous infusion of CGRP decreased tolerance to intragastric administration of glucose (O-GTT) without altering plasma insulin levels, but again IAPPs had no effect.
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14 |
1637089
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IAPP was subsequently shown, like CGRP, to inhibit the release of insulin pharmacologically.
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15 |
11181905
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In addition, SB-(+)-273779 antagonized CGRP-mediated 1) stimulation of intracellular Ca(2+) in recombinant CGRP receptors in HEK-293 cells, 2) inhibition of insulin-stimulated [(14)C]deoxyglucose uptake in L6 cells, 3) vasodilation in rat pulmonary artery, and 4) decrease in blood pressure in anesthetized rats.
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16 |
21277869
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Inhibition of transient receptor potential vanilloid 1 (TRPV1) suppresses calcitonin gene-related peptide (CGRP) secretion in pancreatic nerve fiber cells, thereby stimulating insulin secretion.
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