Decreased IGF-I bioavailability after ethanol abuse in alcoholics: partial restitution after short-term abstinence.

Abstract:

:IGF-I stimulates protein synthesis, lowers blood glucose, and affects cell differentiation. The main production site of IGF-I is the liver. One of its binding proteins, IGFBP-1, is also produced by the liver. It is well known that ethanol affects the function of the human liver. Long-term alcohol abuse may therefore not only cause considerable IGF-I and IGFBP-1 production changes, but also changes in IGF-I bioavailability, which at least in part is determined by the IGF-I/IGFBP-1 ratio. Not much is known about how the bioavailability of IGF-I is changed in alcohol abusers. Therefore, the objective of this investigation was to study that matter, and to elucidate how abstinence affects IGF-I bioavailability in man. Three study groups were formed: group N including normal non-addicted subjects, group E ethanol abusers without gross liver insufficiency, and group C alcohol abusers with liver cirrhosis and ascites. Serum concentrations of insulin, GH, IGF-1, and IGFBP-1 were determined in the morning in all participants, and the IGF-I/IGFBP-1 ratios were calculated. These values were compared in the three study groups. In group E comparison was also made between values recorded in the ethanol intoxicated and in the detoxicated states. Patients in group C had low IGF-I levels, high IGFBP-1 levels, and low IGF-I bioavailability as reflected by the IGF-I/IGFBP-1 ratios, which were several-fold reduced compared with subjects in group N (0.6+/-0.2 vs 10.2+/-2.3; p<0.001). Patients in group E had also a low IGF-I/IGFBP-1 ratio in the acute ethanol intoxicated state, which increased after detoxication (from 1.5+/-0.4 to 5.6+/-1.2; p<0.01). It is concluded that alcohol abuse lowers the hepatic production of IGF-I and increases the production of IGFBP-1. This results in a reduced IGF-I bioavailability. However, in patients with not yet clinically apparent liver damage the IGF-I bioavailability increases if the alcohol abuse is stopped. These findings could reflect an important, physiological adaptation, since hypoglycemia may be induced if the blood glucose-lowering power of IGF-I remains strong at a time of ethanol-induced inhibition of the hepatic gluconeogenesis. Chronic alcohol abuse, causing liver cirrhosis, also leads to markedly reduced IGF-I bioavailability, which appears to become permanent, since it prevails more than one week after stopping the alcohol abuse.

journal_name

J Endocrinol Invest

authors

Röjdmark S,Brismar K

doi

10.1007/BF03343879

keywords:

subject

Has Abstract

pub_date

2001-07-01 00:00:00

pages

476-82

issue

7

eissn

0391-4097

issn

1720-8386

journal_volume

24

pub_type

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