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. 1996 Oct;119(3):583–589. doi: 10.1111/j.1476-5381.1996.tb15712.x

Changes in superoxide dismutase mRNA expression by streptozotocin-induced diabetes.

K Kamata 1, T Kobayashi 1
PMCID: PMC1915697  PMID: 8894182

Abstract

1. Experiments were designed to investigate the involvement of superoxide anions in the attenuated endothelium-dependent relaxation of the rat aorta from streptozotocin (STZ)-induced diabetic rats. 2. The endothelium-dependent relaxation responses to acetylcholine (ACh, 10(-7) M) in helical strips of the aorta precontracted with noradrenaline (NA, 5 x 10(-3) approximately 3 x 10(-7) M) were significantly decreased in STZ-induced diabetic rats. The recovery phase of the relaxation after single administration of ACh in the STZ-induced diabetic rats was more rapid than those in control vessels. 3. Preincubation of aortic strips with superoxide dismutase (SOD, 60 u ml-1) normalized the recovery phase of the relaxation of diabetic aorta after single administration of ACh, whereas catalase (150 u ml-1) or indomethacin (10(-5) M) had no effects on the relaxation. 4. SOD (180 u ml-1) caused relaxation in NA precontracted aortic strips and the degree of the SOD-induced relaxation was significantly greater in diabetic aorta as compared with age-matched control vessels. 5. When the changes in mRNA expressions of Mn-SOD or Cu-Zn-SOD were observed, Mn-SOD mRNA expression was markedly decreased, and Cu-Zn-SOD was slightly decreased in diabetic aorta. 6. These results suggest that the rapid destruction of NO by superoxide anions may occur in the STZ-induced diabetic rats, and this may be due to a decrease in mRNA expression of Mn-SOD or Cu-Zn-SOD.

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Selected References

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