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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1984 Jan;81(2):583–587. doi: 10.1073/pnas.81.2.583

Accelerated age-related browning of human collagen in diabetes mellitus.

V M Monnier, R R Kohn, A Cerami
PMCID: PMC344723  PMID: 6582514

Abstract

The nonenzymatic glycosylation reaction that is accelerated in diabetes is the first step of the Maillard or nonenzymatic browning reaction that occurs in stored food. The glucose-protein adduct rearranges and dehydrates to form brown and fluorescent pigments, which can act as crosslinks, resulting in decreased protein solubility and altered mechanical properties. Evidence suggesting that this process occurs in vivo has been found in lens crystallins. The observation that nonenzymatic glycosylation and insolubility increases in collagen with age and diabetes led us to investigate the possible browning of human collagen. Insoluble human dura mater collagen was digested with collagenase. Absorbance at 350 nm and fluorescence at 440 nm (excitation at 370 nm) of the solubilized material was measured. A linear increase in the amounts of yellow and fluorescent material was observed with age. Samples obtained at autopsy from three type I diabetics and a young type II diabetic showed increased fluorescence and had absorbance values that corresponded to the amount of chromophore found in nondiabetics twice their age (P less than 0.025). The collagen adducts from aged and diabetic individuals had absorption and fluorescence spectra identical to those of collagen samples that underwent nonenzymatic browning with glucose in vitro. The structure of these collagen adducts is unknown. However, their likely occurrence throughout the body could explain the correlation between arterial stiffening, decreased joint mobility, and the severity of microvascular complications in type I diabetics.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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