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. 1995 Jan 15;305(Pt 2):385–390. doi: 10.1042/bj3050385

Non-enzymic glycation of fibrous collagen: reaction products of glucose and ribose.

A J Bailey 1, T J Sims 1, N C Avery 1, E P Halligan 1
PMCID: PMC1136373  PMID: 7832750

Abstract

Non-enzymic glycation of collagen involves a series of complex reactions ultimately leading to the formation of intermolecular cross-links resulting in changes in its physical properties. During analysis for the fluorescent cross-link pentosidine we identified the presence of an additional component (Cmpd K) in both glucose and ribose incubations. Cmpd K was formed more quickly than pentosidine in glucose incubations and more slowly than pentosidine in ribose incubations. Cmpd K represented 45% of the total fluorescence compared with 15% for pentosidine in glucose incubations and 25% of the total fluorescence compared with 30% for pentosidine in the ribose incubations. Cmpd K is not an artefact of in vitro incubations, as it was shown to be present in dermal tissue from diabetic patients. Subsequent high-resolution h.p.l.c. analysis of glucose-incubated collagen revealed Cmpd K comprise two components (K1 and K2). Further, a similar analysis of Cmpd K from the ribose incubations revealed two different components (K3 and K4). These differences indicate alternative mechanisms for the reactions of glucose and ribose with collagen. The amounts of these fluorescent components and the pentosidine cross-link determined for both glucose and ribose glycation were found to be far too low (about one pentosidine molecules per 200 collagen molecules after 6 months incubation with glucose) to account for the extensive cross-linking responsible for the changes in physical properties, suggesting that a further additional series of cross-links are formed. We have analysed the non-fluorescent high-molecular-mass components and identified a new component that increases with time of in vitro incubation and is present in the skin of diabetic patients. This component is present in sufficient quantities (estimated at one cross-link per two collagen molecules) to account for the changes in physical properties occurring in vitro.

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Selected References

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