Direct effects of glucagon on protein and amino acid metabolism in the isolated perfused rat liver. Interactions with insulin and dexamethasone in net synthesis of albumin and acute-phase proteins.

Abstract:

:The isolated rat liver perfused for 12 hours at pH 7.10 with a suspension of bovine erythrocytes in Krebs-Ringer bicarbonate buffer containing 3 per cent bovine serum albumin has been used as a test system to study effects of glucagon and of dexamethasone in the presence and absence of insulin on net biosynthesis of rat serum albumin, fibrinogen, alpah1-acid glycoprotein, alpha2-(acute phase) globulin, and haptoglobin. Quantitative measurement of perfusate glucose, amino acid nitrogen, and urea affords a basis for determining net glucose and nitrogen balance in the perfusion system. Although the dose of dexamethasone (total 1.0 mug.) used was insufficient to induce synthesis of alpha2-acute phase globulin, net syntheses of albumin, fibrogen, alpha1-acid glycoprotein, and haptoglobin were increased. Glucagon given with dexamethasone depressed albumin and haptoglobin synthesis markedly, but not that of fibrinogen and alpha1-acid glycoprotein. Glucagon with dexamethasone markedly enhanced ureogenesis and glycogenolysis and elicited an exaggerated negative nitrogen balance. The unfavorable effects of glucagon on albumin and haptoglobin synthesis and on nitrogen balance were reversed by giving insulin simultaneously. It is emphasized that insulin is essential for positive nitrogen balance.

journal_name

Diabetes

journal_title

Diabetes

authors

Miller LL

subject

Has Abstract

pub_date

1976-01-01 00:00:00

pages

865-71

issue

2 SUPPL

eissn

0012-1797

issn

1939-327X

journal_volume

25

pub_type

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