Metabolism of Rabbit Skin Collagen. Differences in the Apparent Turnover Rates of Type-I- and Type-III-collagen Precursors Determined by Constant Intravenous Infusion of Labelled Amino Acids

Overview

Journal Biochem J

Specialty Biochemistry

Date 1979 Jul 1

PMID 486162

Citations 11

Authors

S P Robins

Affiliations

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Abstract

Growing rabbits were infused for up to 10 h with labelled proline, tyrosine and leucine to achieve plateau conditions within body free pools, for [3H]proline infusion, blood free-proline specific radioactivity remained constant after about 1 h. For individual animals, type-I- and type-III-collagen precursors were isolated by precipitation with (NH4)2SO4 and DEAE-cellulose chromatography. Experiments where 3H- and 14C-labelled proline and tyrosine were infused concurrently for different periods of time showed that type I procollagen reached plateau specific radioactivity within 3 h and 90% of the plateau value after 2 h infusion, corresponding to a calculated apparent t 1/2 of less than 26 min. Plateau values for type I procollagen were taken as precursor amino acid pool specific radioactivities. The type-III-collagen-precursor fractions consistently showed lower rates of label incorporation and, by assuming that both type I and type III collagens are synthesized from the same amino acid pools, kinetic analysis revealed an apparent t 1/2 for the isolated type-III-collagen precursors of 3.9 h. For proline, there were large variations between animals in the ratio between the precursor pool for collagen synthesis and the skin homogenate free pool (0.31 +/- 0.13, mean +/- S.D.), so that collagen-synthesis rates based solely on total tissue free-pool values for proline are subject to large and inconsistent errors.

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