Journal of Investigative Dermatology (1979) 73, 80–83; doi:10.1111/1523-1747.ep12532769
Aging of Collagen
J Peter Bentley
Department of Biochemistry, University of Oregon Health Sciences Center, Portland, Oregon, U.S.A.
Top of pageAbstract
Current knowledge of the structure and the mechanism of formation of the covalent cross-links that fuse individual collagen molecules into a stable fiber is reviewed. Some of the mechanical properties of dermal connective tissue and the way in which these change with age can be correlated with the types of cross-link present in the tissue.
Cross-links are routinely detected by treatment of a tissue sample with tritium-labeled borohydride and subsequent isolation and quantification of the cross-linked compound, which has been rendered radioactive by reaction with this reducing compound. After maturity, the number of detectable cross-links decreases even though the mechanical stability of the tissue increases. This anomaly is examined in the light of recent data suggesting that cross-links may be oxidized in vivo and thus become undetectable since they can no longer react with borohydride.
Top of pageReferences
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