Chromium-Induced Glucose Uptake, Superoxide Anion Production, and Phagocytosis in Cultured Pulmonary Alveolar Macrophages of Weanling Pigs
作者:Der-Nan Lee、Houng-Ta Yen、Tian-Fuh Shen、Bao-Ji Chen
DOI:10.1385/bter:77:1:53
日期:——
The dose-dependent effects of chromium chloride(CrCl3) and chromium picolinate (CrPic) were evaluated for their glucose uptake, superoxide anion (O-2(-)) production, activity of glucose-6-phosphate dehydrogenase, and phagocytosis of incubated pulmonary alveolar macrophages in medium containing no or 5 x 10(-8)M insulin. Glucose uptake was found to increase in cells treated with 20 mug/L CrCl3. Incubation with 20 mug/L of CrPic enhanced glucose uptake and O-2(-) production in an insulin-dependent manner. However, the inclusion of CrPic to 100 mug/L in the medium absent of insulin also increased O-2(-) production. The activity of glucose-6-phosphate dehydrogenase was not affected by either the addition of Cr or insulin. The phagocytosis of Escherichia coli by macrophages was enhanced significantly (p < 0.05) in medium containing 10-100 g/L CrCl3 or 20-100 mug/L CrPic in the presence of insulin. These results suggest that the addition of 10-20 mug/L CrCl3 enhances directly the cellular activity of macrophages, whereas the effect of CrPic requires the cooperative action of insulin in enhancing their glucose uptake and phagocytosis.