High concentrations of glucose reduce the oxidative metabolism of dog neutrophils in vitro

BMC Veterinary Research

Research Article

Luis G Narciso¹  Valéria MF Lima¹  Breno FM de Almeida¹  Priscila P Pereira¹  Paulo C Ciarlini¹  Anelise M Bosco¹ 

[1] Department of Clinical, Surgery and Animal Reproduction, College of Veterinary Medicine of Araçatuba, São Paulo State University, Araçatuba,, SP, Brazil;

关键词: Superoxide;    Respiratory burst;    Programmed cell death;    Leukocyte dysfunction;    Hyperglycemia;   

DOI  :  10.1186/1746-6148-9-24

 received in 2012-08-03, accepted in 2013-02-01,  发布年份 2013

来源: Springer

【 摘 要 】

BackgroundDogs are commonly affected by hyperglycemic conditions. Hyperglycemia compromises the immune response and favors bacterial infections; however, reports on the effects of glucose on neutrophil oxidative metabolism and apoptosis are conflicting in humans and rare in dogs. Considering the many complex factors that affect neutrophil oxidative metabolism in vivo, we investigated in vitro the specific effect of high concentrations of glucose on superoxide production and apoptosis rate in neutrophils from healthy dogs.ResultsThe capacity of the neutrophils to reduce tetrazolium nitroblue decreased significantly in the higher concentration of glucose (15.13 ± 9.73% (8 mmol/L) versus 8.93 ± 5.71% (16 mmol/L)). However, there were no changes in tetrazolium nitroblue reduction at different glucose concentrations when the neutrophils were first activated with phorbol myristate acetate. High concentrations of glucose did not affect the viability and apoptosis rate of canine neutrophils either with or without prior camptothecin stimulation. This study provides the first evidence that high concentrations of glucose inhibit the oxidative metabolism of canine neutrophils in vitro in a manner similar to that which occurs in humans, and that the decrease in superoxide production did not increase the apoptosis rate.ConclusionsA high concentration of glucose reduces the oxidative metabolism of canine neutrophils in vitro. It is likely that glucose at high concentrations rapidly affects membrane receptors responsible for the activation of NADPH oxidase in neutrophils; therefore, the nonspecific immune response can be compromised in dogs with acute and chronic hyperglycemic conditions.

【 授权许可】

CC BY   
© Bosco et al.; licensee BioMed Central Ltd. 2013