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Clinical Chemistry 32: 1328-1331, 1986;
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Clinical Chemistry, Vol 32, 1328-1331, Copyright © 1986 by American Association for Clinical Chemistry

Nonenzymatic glycation of human platelet membrane proteins in vitro and in vivo

T Sampietro, S Lenzi, P Cecchetti, O Giampietro, L Cruschelli and R Navalesi

Human platelet membrane proteins (PMP), incubated in vitro in the presence of various concentrations of glucose, undergo nonenzymatic glycation, as evidenced by incorporation of [3-3H]glucose radioactivity into the acid-precipitable fraction. The time course of the reaction is linear for the first hours, and the rate of glycation depends on the glucose concentration in the medium: at a glucose concentration of 80 mmol/L, up to 60 nmol of glucose is bound per milligram of PMP. The ketoaminic nature of the glucose/protein linkages was demonstrated by the finding of 5-hydroxymethylfurfuraldehyde by liquid-chromatographic analysis of acid hydrolysates of PMP. We analyzed PMP from 13 subjects with type I poorly controlled diabetes and from 10 nondiabetics. Nonenzymatic glycation, evaluated as nanomoles of the aldehyde per milligram of protein, was much greater in diabetic patients than in nondiabetics: 1.58 +/- 0.70 vs 0.37 +/- 0.18 (mean +/- SD).


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Copyright © 1986 by the American Association for Clinical Chemistry.