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- W2016037514 abstract "The effect of hyperglycemia upon susceptibility to bacterial infection in diabetes mellitus is incompletely elucidated. The present experiments assessed the effect of hyperglycemia upon neutrophil-mediated phagocytosis of type III group B Streptococcus (GBS). Type III GBS was chosen for study because the incidence of invasive GBS disease is substantially increased in type 2 diabetic compared with nondiabetic subjects. The hypothesis tested was that severe hyperglycemia would alter neutrophil metabolism by diverting NADPH from superoxide production into the aldose reductase-dependent polyol pathway that converts glucose into sorbitol and thus would impair opsonophagocytosis (OP) of type III GBS. Neutrophils from 10 adults with type 2 diabetes had no intrinsic phagocytic defect under baseline glycemic conditions. After equilibration in 60 or 120 mM glucose or in 60 mM choline chloride, OP activity was reduced significantly (P < or = 0.03). Neutrophil superoxide production correlated with glucose concentration and also was significantly reduced during hyperglycemia (P < 0.05). Addition of III GBS capsular polysaccharide-specific IgG in a sufficient concentration supported efficient OP, even during hyperglycemia. Alrestatin, an aldose reductase inhibitor, increased superoxide production and significantly improved OP of type III GBS (P = 0.03). Thus, diversion of NADPH into the polyol pathway is one mechanism by which OP of GBS III is impaired during hyperglycemia, and this effect is mitigated when levels of capsular polysaccharide-specific IgG are sufficient." @default.
- W2016037514 created "2016-06-24" @default.
- W2016037514 creator A5058759858 @default.
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- W2016037514 date "2001-07-01" @default.
- W2016037514 modified "2023-10-13" @default.
- W2016037514 title "Impairment of Type III Group B Streptococcus-Stimulated Superoxide Production and Opsonophagocytosis by Neutrophils in Diabetes" @default.
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- W2016037514 doi "https://doi.org/10.1006/mgme.2001.3185" @default.
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