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Original Article The Relationship between Apolipoprotein E Phenotypes, Serum Lipid Metabolism, and Oxidative Stress in Korean Type 2 Diabetic Patients.
Soo Bong Choi, Sun Min Park
Diabetes & Metabolism Journal 1999;23(2):182-192
Published online: January 1, 2001
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1Department of Internal Medicine, College of Medicine, KonKuk University, Chung Ju, ChungBuk, Korea.
2Department of Food & Nutrition, College of Natural Science, Hoseo University, ChungNam, Korea.

The cause of type 2 diabetes mellitus (DM) is not known, but one of the causes may be the reduction of insulin secretion through the fibrosis formed with amyloid deposits in pancreatic beta cells. Amyloidogenesis in hippocampus is a characteristic feature in Alzheimers disease. Possession of the Apolipoprotein (Apo) E 4 allele (E4/2, FA/3 or E4/4) is a risk factor for the development of Alzheimers disease. However, it is controversial that Apo E polymophsim is associated with the etiopathology of type 2 DM. Both Alzheimers disease and type 2 DM has increased oxidative stress, which may be related to the formation of fibrosis. The purpose of this study was to investigate the distribution of Apo E phenotypes in type 2 diabetic subjects and healthy subjects, and to determine whether Apo E phenotypes influenced serum lipid profiles and glutathione peroxidase and superoxide dismutase activities of red blood cells in type 2 DM and healthy subjects. METHODS: Overnight fasting blood was collected from 84 type 2 diabetic patients and 85 healthy subjects. Apo E phenotypes was determined by the isoelectrofocusing method. Serum lipid profiles and supetoxide dismutase and glutathione peroxidase activ'ities of red blood cells (RBC) were measured. RESULTS: The frequency of Apo E 4 in the type 2 DM was higher than that in the control group (p<0,05). The serum total cholesterol and triglyceride levels of the type 2 DM were overall higher than in healthy subjects. Serum lipid profiles were not affected by Apo E phenotypes in healthy subjects. However, semm total cholesterol levels of type 2 diab diabetic patients with Apo E3/3 were signifcantly lower than those with Apo FA/3 (p<0.05), but serum HDL, cholesterol levels had an opposite tendency. Serum triglyceride levels of type 2 diabetic patients with Apo E3/2 were higher than those with Apo E4/3 (p<0.05), RBC superoxide dismutase and gluta,thione peroxidase activities in type 2 diabetic patients tended to be lower than those in the control group. These enzyme activities of type 2 diabetic patieints with Apo E3 were lowest among the Apo E phenotype groups (p<0.05). CONCLUSION: This result suggests that type 2 diabctic patients had more Apo E 4 allele than in healthy people. Antioxidant enzyme activities decrqased in type 2 diabetic patients with Apo E 4 allele. Serum lipid profiles of type 2 diabetic patients with Apo E 4 allele was an increased risk factor for cardiovascular disease.

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    The Relationship between Apolipoprotein E Phenotypes, Serum Lipid Metabolism, and Oxidative Stress in Korean Type 2 Diabetic Patients.
    Korean Diabetes J. 1999;23(2):182-192.   Published online January 1, 2001
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