- Effect of Aminoguanidine on Lipid Peroxidation in Streptozotocin-induced Diabetic Rats.
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Kwon Yeop Lee, Sung Hee Ihm, Hyung Joon Yoo, Sung Woo Park, Ja Hei Ihm
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Korean Diabetes J. 1997;21(4):372-380. Published online January 1, 2001
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 Abstract
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- BACKGROUND
Diabetes mellitus is postulated to be associated with increased lipid peroxidation which may contribute to vascular complications. One potential mechanism of the increased lipid peroxidation in diabetes is lipid-linked advanced glycosylation and oxidation. Aminoguanidine(AMGN), the prototype inhibitor of advanced glycosylation end-product formation, has been recently shown to prevent oxidative moditication of LDL in vitro at moderate concentration. It is unknown whether AMGN might act as an anti-oxidant against lipid peroxidation under hyperglycemia in vivo. METHODS: To investigate the in vivo effect of AMGN on lipid peroxidation in diabetes, we administered AMGN(1 g/L in drinking water) or vitamin E (400mg/day, 5 days/week) to streptozotocin(STZ)-induced diabetic rats for 9 weeks and measured plasma lipid hydroperoxides by ferrous oxidation with xylenol orange II method and RBC membrane malon-dialdehyde(MDA) by thiobarbituric acid method. RESULTS: Plasma lipid hydroperoxide level was higher in STZ-induced diabetic rats than in control rats(7.53+/-2.03 vs.5.62+/-0.44*pmol/L). RBC membrane MDA was also higher in STZ-induced diabetic rats than in control rats(2.67+/-0.46 vs. 1.81+/-0.19* nmol/mL). Plasma lipid hydroperoxide level was lower in AMGN-treated(6.23+/-0.59*umol/L) and vitamin E-treated(5.29+/-0.27*umol/L) diabetic rats than in untreated diabetic rats. RBC membrane MDA was also lower in AMGN-treated(1.93+/-0.12""'nmol/ mL) diabetic rats than in untreated diabetic rats. There was no significant difference in plasma glucose, triglyceride levels among diabetic groups(Mean +/-S.D; *, P<0.05 vs. untreated STZ-induced diabetic rats; n=8-14/group). CONCLUSION: Although the mechanisms of action of AMGN on lipid peroxidation in vivo should be studied further, these results suggest that AMGN might have an additional beneficial effect as an antioxidant against lipid peroxidation in prevention trial for diabetic vascular complications.
- Prognostic Factors in the Elderly Diabetic Hyperosmolar Non-ketotic Coma.
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Min Sook Park, Hyung Joon Yoo, Sun Hwa Jung, Kwon Yeop Lee, Cheol Soo Park, Cheol Hong Kim, Hyun Gyu Kim, Jae Myeog Yoo, Du Man Kim, Sung Hee Ihm, Moon Gi Choi, Sung Woo Park
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Korean Diabetes J. 1997;21(2):194-199. Published online January 1, 2001
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Abstract
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- OBJECTIVES
: The diabetic hyperosmolar non-ketotic coma represents an acute complication of diabetes affecting mostly elderly persons with non-insulin dependent diabetes rnellitus. It is characterized by marked hyperglycemia, hyperosmolarity, severe dehydration, occasional neurologic signs, obtunded sensorium, and absence of ketonemia or acidosis. Most investigators have evaluated the relationship of predisposing conditions with HNKC, to evaluate outcome of the elderly HNKC we studied the prognostic factors in the elderly HNKC. Patients and METHODS: We retrospectively studied 43 patients with HNKC admitted to Hospital of Hallym University during an 6-year period, 1990 through 1995. All medical records of elderly patients (65 years old or more) discharged with the diagnosis of HNKC, were reviewed. To be included as a case, patients had to have a serum glucose level greater than 500mg/dL, measured plasma osmolarity greater than 320mOsm/L, pH greater than 7.30 and disoriented sensorium. 1nformation that was gathered age, glucose, blood urea nitrigen, creatinine, Na+, K+, HCO3-, anion gap, plasma osmolarity, urine osmolarity and whether the patients was discharged alive or died in the hospital. Data were analyzed by one-factor ANOVA and significance of difference between proportions was calculated by Newman-Keuls test. RESULTS: Survivors of 43 elderly HNKC were 22 patients and non-survivors were 21 patients. Mortality was 49%. Analysis revealed that the plasma osmolarity was significantly higher among those who non-survivors (376 +/- 10.8versus 331 +/- 5.0mOsm/L, p 0.01). Non-survivors also had significantly higher serum creatinine level than survivors (2.1+/-0.41versus 1.6 +/- 0.18mg/dL, p = 0.024) Conelusion: These results suggest that the prognostic factors of elderly HNKC were plasma osrnolarity and serum creatinine level.
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