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INHIBITION OF PHOSPHOLIPASE D AND SUPEROXIDE GENERATION BY GLUCOSE IN DIABETIC NEUTROPHILS

机译:葡萄糖对糖尿病中性粒细胞磷脂酶D的抑制和过氧化物的产生

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Diabetics are prone to infection, in part, due to neutrophil dysfunction and impaired superoxide generation. The mechanism of Impaired superoxide generation in diabetes remains unknown. We report herein that neutrophils from poorly controlled diabetics have impaired ability to generate superoxide in response to N-formyl-Met-Leu-Phe (FMLP) but not to 4 beta-phorbol 12-myristate 13-acetate (PMA). Phosphatidic acid, a phospholipase D (PLD)-mediated product of membrane phosphatidylcholine is decreased in response to FMLP. The impaired superoxide generation and activation of phospholipase D are readily reversible once the diabetic neutrophils are incubated in normal glucose concentration. These data show that decreased superoxide generation by neutrophils in insulin-dependent diabetics is, in part activation of phospholipase D and is solely due to high glucose concentrations. [References: 21]
机译:糖尿病患者易于感染,部分原因是中性粒细胞功能障碍和超氧化物生成受损。糖尿病中超氧化物生成受损的机制尚不清楚。我们在这里报告说,来自控制不佳的糖尿病患者的中性粒细胞损害了产生超氧化物的能力,以响应N-甲酰基-Met-Leu-Phe(FMLP),而不是响应4β-佛波醇12-肉豆蔻酸酯13-乙酸酯(PMA)。响应于FMLP,膜磷脂酰胆碱的磷脂酶D(PLD)介导的产物磷脂酸降低。一旦在正常葡萄糖浓度下培养糖尿病中性粒细胞,受损的超氧化物的产生和磷脂酶D的活化就很容易被逆转。这些数据表明,在胰岛素依赖型糖尿病患者中,嗜中性粒细胞产生的超氧化物减少的部分原因是磷脂酶D的活化,这完全是由于高葡萄糖浓度引起的。 [参考:21]

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