Diabetes, Vol 41, Issue 10 1286-1292, Copyright © 1992 by American Diabetes Association

ARTICLES

Pentosidine formation in skin correlates with severity of complications in individuals with long-standing IDDM

DR Sell, A Lapolla, P Odetti, J Fogarty and VM Monnier
Institute of Pathology, Case Western Reserve University, Cleveland, Ohio 44106.

Pentosidine is an advanced glycosylation end product and protein cross-link that results from the reaction of pentoses with proteins. Recent data indicate that long-term glycation of proteins with glucose also leads to pentosidine formation through sugar fragmentation. In this study, the relationship between the severity of diabetic complications and pentosidine formation was investigated in collagen from skin-punch biopsies from 25 nondiabetic control subjects and 41 IDDM patients with diabetes duration greater than 17 yr. Pentosidine was significantly elevated in all IDDM patients versus control subjects (P less than 0.0001). It correlated strongly with age (P less than 0.0001) and weakly with duration (P less than 0.082). Age-adjusted pentosidine levels were highest in grade 2 (severe) versus grade 1 and 0 complication in all four parameters tested (retinopathy, proteinuria, arterial stiffness, and joint stiffness). Significant differences were found for retinopathy (P less than 0.014) and joint stiffness (P less than 0.041). The highest degree of association was with the cumulative grade of individual complication (P less than 0.005), determined by summing indexes of all four parameters. Pentosidine also was significantly elevated in the serum of IDDM patients compared with control subjects (P less than 0.0001), but levels were not significantly correlated with age, diabetes duration, complication, or skin collagen pentosidine (P greater than 0.05). A high correlation between pentosidine levels and long-wave collagen-linked fluorescence also was observed, suggesting that pentosidine is a generalized marker of accelerated tissue modification by the advanced glycosylation/Maillard reaction, which is enhanced in IDDM patients with severe complications.
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