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Biomedical subjects

J Rivier

Publications and source records attributed to J Rivier.

At least 379 records · Page 21Linked to original sources
PubMed1977

Somatostatin: analogs with selected biological activities.

[D-Cys14]-Somatostatin is the first analog of somatostatin found to be more potent in inhibiting glucagon and growth hormone secretion that it is in inhibiting insulin secretion. [D-Trp8]-Somatostatin is eight to ten times more potent than somatostatin in inhibiting insulin, glucagon, and growth hormone secretion. [D-Trp8, D-Cys14]-Somatostatin is more potent than [D-Cys14]-Somatostatin, but retains its relative selectivity in being a more potent inhibitor of the secretion of glucagon and growth hormone than of insulin.

Animals↗
PubMed1977

Bombesin:potent effects on thermoregulation in the rat.

Several vasoactive peptides administered intracisternally have been assessed for the effect of lowering the core temperature of rats exposed to cold. Peptides structurally related to neurotensin lower core temperature while those related to substance P do not. The tetradecapeptide bombesin, orginally isolated from the extracts of the skin of the frog Bombina bombina, is 10(4) times more potent than neurotensin in lowering core temperature, with a minimal effective dose less than or equal to 1 nanogram per 200 grams of body weight. Thus bombesin is one of the most potent peptides reported to affect the central nervous system.

Amino Acid Sequence↗
PubMed1976

Biological activity of somatostatin and somatostatin analogs on inhibtion of arginine-induced insulin and glucagon release in the rat.

Somatostatin and dihydrosomatostatin (H2somatostatin) are equipotent in inhibiting insulin and glucagon release induced by arginine in the rat. The ID50 of H2somatostatin on insulin and glucagon secretion induced by arginine are 14 +/- 6 and 6 +/- 10 mug/100 g BW respectively, similar to the ID50 of H2somatostatin (18 +/- 10 mug/100 g BW) on inhibition of insulin release induced by glucose. Thyrotropin releasing factor, luteinizing hormone releasing factor, alpha-MSH, and the N-terminus decapeptide of the beta-chain of porcine hemoglobin did not alter the secretion of insulin and glucagon induced by arginine. With the exception of [Ala2[-somatostatin and [Ala5]-somatostatin, alanine substituted analogs of somatostatin were less potent than somatostatin. [D-Trp8]-somatostatin is 6-8 times as potent as somatostatin in inhibiting insulin and glucagon release induced by arginine. The relative potencies of these analogs to inhibit the secretion of the pancreatic hormones are in good agreement with our previously reported values based on the inhibition of GH secretion in vitro.

Animals↗