Baehner R L, Gilman N, Karnovsky M L
J Clin Invest. 1970 Apr;49(4):692-700. doi: 10.1172/JCI106281.
A comparison has been made of the metabolic shifts in human and guinea pig leukocytes when they phagocytize. Respiration of guinea pig polymorphonuclear leukocytes (PMN) and the increment during phagocytosis were each about 2(1/2)-fold that of human PMN. This was also true of the direct oxidation of glucose-6-P (hexose monophosphate shunt). Enzymes potentially responsible for these phenomena have been compared in each species. Cyanide-insensitive NADH oxidase and NADPH oxidase were measured and only the formed exhibited adequate activity to account for the respiratory stimulus durintg phagocytosis. The hydrogen peroxide formed by this enzyme stimulates the hexose monophosphate shunt by oxidizing glutathione which upon reduction by an NADPH-linked glutathione reductase provides NADP to drive the hexose monophosphate shunt. Other linkages between respiratory stimulation and that of the hexose monophosphate shunt also pertain in the guinea pig.
对人类和豚鼠白细胞吞噬时的代谢变化进行了比较。豚鼠多形核白细胞(PMN)的呼吸作用以及吞噬过程中的增加量分别约为人类PMN的2.5倍。葡萄糖-6-P的直接氧化(磷酸己糖旁路)也是如此。对每个物种中可能导致这些现象的酶进行了比较。测量了对氰化物不敏感的NADH氧化酶和NADPH氧化酶,只有后者表现出足够的活性来解释吞噬过程中的呼吸刺激。该酶产生的过氧化氢通过氧化谷胱甘肽来刺激磷酸己糖旁路,而谷胱甘肽在由与NADPH相关的谷胱甘肽还原酶还原后提供NADP以驱动磷酸己糖旁路。呼吸刺激与磷酸己糖旁路之间的其他联系在豚鼠中也存在。