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      [The effects of glucose fluctuation on resistin].

      Zhonghua nei ke za zhi

      metabolism, Blood Glucose, analysis, Cell Line, Tumor, Culture Media, Diabetes Mellitus, Type 2, Female, Glucose, Adult, Glucose Intolerance, Glucose Tolerance Test, Humans, Hyperglycemia, Male, Middle Aged, Resistin

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          To explore the effect of glucose fluctuation on resistin. The phorbol-12-myristate-13-acetate(PMA)-activated and differentiated U937 cells were exposed to experimental condition for 3 days, three groups of cells were formed, each one receiving the following fresh medium every 6 hours, respectively: (1) continuous 11.1 mmol/L glucose concentration medium (Con group), (2) continuous 22.2 mmol/L glucose concentration medium (CHG group), (3) alternating 11.1 mmol/L glucose concentration and 22.2 mmol/L glucose concentration medium every 6 hours (IHG group). The supernatants of cell median at the last 6 hours were collected to test resistin concentration. Besides, 92 subjects were selected and classified into three groups according to the results of oral glucose tolerance test: normal glucose tolerance group (NGT group, n=30), impaired glucose tolerance patients (IGT group, n=31) and newly diagnosed type 2 diabetes patients (T2DM group, n=31). Blood glucose and serum resistin levels were measured at 0 h and 1 h during oral glucose tolerance test (OGTT) to compare the glucose fluctuation (ΔGlu1-0) and the change of serum resistin level (ΔlnRes1-0) among the three groups. Resistin concentration in the Con, CHG and IHG group was (73.62±5.07) ng/L, (97.78±7.00) ng/L and (212.49±28.81) ng/L respectively and in IHG group it was higher as compared with the other two groups (P<0.05). ΔGlu1-0 in NGT, IGT and T2DM group was (2.31±2.30) mmol/L, (5.70±2.08) mmol/L and (8.41±2.63) mmol/L respectively; ΔGlu1-0 increased gradually in all the three groups (P<0.05). Serum resistin level from 0 h to 1 h in the NGT group was 6.41 (1.52-15.76) µg/L to 6.96 (1.52-22.70) µg/L, in the IGT group 5.47 (1.49-24.09) µg/L to 9.12 (1.27-21.94) µg/L and in the T2DM group 5.77 (1.11-30.10) µg/L to 9.27(1.02-48.15) µg/L. In the IGT and T2DM group serum resistin level increased from 0 h to 1 h (P<0.05), but no difference was observed in the NGT group (P>0.05). ΔlnRes1-0 in these 3 groups was (0.05±0.05) µg/L, (0.25±0.04) µg/L and (0.37±0.03) µg/L respectively and the change in the T2DM group was significant as compared with that in the NGT group, ΔlnRes1-0 was positively correlated with ΔGlu1-0 (r=0.23, P=0.02). Glucose fluctuation induced monocyte/macrophage to secrete resistin, greater the glucose fluctuation, greater the change of amplitude of serum resistin.

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