PMID: 8586002May 1, 1995Paper

Plasma oxidizability in subjects with normal glucose tolerance, impaired glucose tolerance, and NIDDM

Diabetes Care
S M HaffnerI Jialal

Abstract

Several lines of evidence support an atherogenic role for oxidized low-density lipoprotein (LDL). Studies on LDL oxidation in diabetes to date have examined LDL isolated from plasma, but have failed to evaluate the other pro- and antioxidant factors present in vivo, the balance of which could be crucial in determining the susceptibility of LDL to lipid peroxidation. We examined the oxidizability of plasma from Mexican-Americans in the San Antonio Heart Study. The oxidizability of plasma in 75 subjects with normal glucose tolerance (NGT), impaired glucose tolerance (IGT), and non-insulin-dependent diabetes mellitus (NIDDM) was studied after co-incubation with a free radical initiator, 2,2'-azobis-2-amidinopropane hydrochloride (AAPH). Lipid peroxide (LPO) levels were measured by a modified fluorimetric assay. Baseline LPO levels (mumol/l; means +/- SE) were similar in the three glucose tolerance categories (NGT, 1.99 +/- 0.07; IGT, 1.88 +/- 0.07; NIDDM, 1.97 +/- 0.07; P = 0.521). However, after incubation with AAPH (NGT, 4.30 +/- 0.20; IGT, 4.45 +/- 0.20; NIDDM, 5.35 +/- 0.20; P = 0.003), the diabetic plasma had significantly greater amounts of LPOs compared with the other two groups. There was no significant difference in LPOs ...Continue Reading

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