Regulation of insulin-like growth factor-I and of insulin-like growth factor binding protein-1, -3 and -4 in cocultures of rat hepatocytes and Kupffer cells by interleukin-6.

Abstract:

BACKGROUND/AIMS:Catabolism is associated with decreased serum concentrations of insulin-like growth factor (IGF)-I and insulin-like growth factor binding protein (IGFBP)-3 associated with elevated IGFBP-3 protease activity and increased concentrations of IGFBP-1 and -4. The effects of the acute phase mediators interleukin (IL)-6, IL-1beta and tumor necrosis factor alpha (TNFalpha) on the biosynthesis of IGF-I and IGFBPs were studied in primary rat liver cells. METHODS:mRNA levels of IGF-I and of IGFBPs were analyzed by Northern blotting, secretion of IGFBPs by [(125)I]IGF-I ligand blotting. Proteolytic activity was measured using iodinated recombinant IGFBP-3 as the substrate. RESULTS:In hepatocytes, Kupffer cells (KC) and cocultures of hepatocytes with KC, IL-6 reduced IGF-I biosynthesis dose-dependently. IL-6 stimulated mRNA expression and protein secretion of IGFBP-1 and -4 in hepatocytes and that of IGFBP-3 in KC, respectively. In cocultures, biosynthesis of IGFBP-1, -3 and -4 was increased dose-dependently by IL-6, while the effects of IL-1beta or TNFalpha were less prominent. At neutral pH, proteolytic activity against IGFBP-3 was not detected in media of cocultures treated with IL-6. CONCLUSIONS:The alterations of IGF-I, IGFBP-1 and -4 observed in catabolism correlate with the effects of IL-6 on the biosynthesis of these components in primary rat liver cells, while a neutral IGFBP-3 protease was not detectable.

journal_name

J Hepatol

journal_title

Journal of hepatology

authors

Lelbach A,Scharf JG,Ramadori G

doi

10.1016/s0168-8278(01)00170-2

subject

Has Abstract

pub_date

2001-11-01 00:00:00

pages

558-67

issue

5

eissn

0168-8278

issn

1600-0641

pii

S0168827801001702

journal_volume

35

pub_type

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