Anti-diabetic drug, metformin, and the p38 inhibitor (SB203580) reduces internal organs oxidative stress in non-obese type 2 diabetic rats

Diabetic complications caused by hyperglycemia and oxidative stress, which can activate p38 mitogen-activatedprotein kinase (p38 MAPK), and aggravate complications via the enhancement of reactive oxygen species (ROS)generation. Recently, metformin or p38 MAPK inhibitors could reduce ROS production in particularly proteincarbonylation, in diabetic vessel. However, the combinatorial effect of metformin and SB203580 on internal organoxidative stress in non-obese (lean) type 2 diabetes mellitus (T2DM) is still uncleared. In this study, Goto-Kakizakirats were divided into four groups, including control diabetic group, metformin-treated group, p38 MAPK inhibitor(SB203580)-treated group, and combination between metformin and p38 MAPK inhibitor (SB203580). Internal organprotein from kidney, pancreas, liver, and brain was determined for protein carbonyl (PC) content by spectrophotometric2, 4-Dinitrophenylhydrazine assay. There was an increase in PC content levels in the serum and internal organs ofT2DM. Metformin ameliorated PC content in serum and internal organs. However, SB203580 could only reduce thePC content in the liver. The combination of metformin and SB203580 could synergistically reduce the PC contentlevels in serum but not the internal organs. In summary, metformin provided the greatest potential for reducingoxidative stress, while SB203580 or combined metformin with SB203580 could not reduce oxidative stress in theinternal organs of non-obese type 2 diabetic rats.

Effects of p38 MAPK Inhibitor on Acute Renal Failure / 中国医师杂志

Objective To observe the change of renal function and cell apoptosis after injecting SB203580 before and after reperfusion, and investigate the protective role of p38 MAPK inhibitor SB203580 for ischemic/reperfused kidney in rats. Methods p38 MAPK inhibitor SB203580 was injected by tail vein into rats with ischemic kidney before and after reperfusion. The plasma levels of creatine and BUN were measured at various time points. The apoptotic rate in the renal tissue at various time points was determined using TUNEL. Results Administering SB203580 before reperfusion could decrease renal cell apoptotic rate, and renal function damage. Administering SB203580 after reperfusion had not obvious effect on the renal function and cell apoptosis. Conclusion Administering p38 MAPK inhibitor before reperfusion can attenuate post-ischemic renal fuction damage and cell apoptosis.