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Acute glucose overload potentiates nitric oxide production in lipopolysaccharide‐stimulated macrophages: The role of purinergic receptor activation
Author(s) -
Chen YuJen,
Hsu KaiWen,
Chen YunLiang
Publication year - 2006
Publication title -
cell biology international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.932
H-Index - 77
eISSN - 1095-8355
pISSN - 1065-6995
DOI - 10.1016/j.cellbi.2006.06.003
Subject(s) - purinergic receptor , apyrase , nitric oxide , lipopolysaccharide , chemistry , nitric oxide synthase , adenosine triphosphate , biochemistry , receptor , biology , endocrinology , organic chemistry
Abstract The positive effects of high glucose on the cellular productivity of nitric oxide (NO), and the mechanisms of the enhancement, were investigated. Macrophages were shifted from normal‐glucose medium (5.5 mM) to high‐glucose medium (25 mM) and immediately treated with lipopolysaccharide (LPS). Inducible nitric oxide synthase (iNOS) expression was expressed significantly more quickly, and NO production also increased. High‐glucose conditions reduced cell viability at 48 h. Pretreatment with oxidized adenosine triphosphate (o‐ATP), the selective purinergic receptor antagonist, strongly reduced LPS‐induced iNOS expression, NO production and cell death in cells exposed to high levels of glucose. Apyrase, an ATP‐hydrolyzing enzyme, also reduced the effects of high‐glucose content. High‐glucose content promoted the LPS‐induced release of endogenous ATP from RAW 264.7 cells, as measured by luciferin—luciferase assay. In summary, the results revealed that purinergic receptor is important in responding to LPS challenge, increasing LPS‐induced NO production and cell death under high‐glucose conditions, and promoting the release of ATP from macrophages in high‐glucose medium.