ABSTRACT
Objective To observe the effect of cholecystokinin-octopeptide(CCK-8) on oxidative stress and cell proliferation in mice islet β cells (NIT-1 cells) injured by high concentration free fat acids .Methods In vitro cultured NIT-1 cells were divided into 3 groups ,they were control group ,FFAs group (add 0 .25 mmol/mL of oleinic acid + 0 .25 mmol/mL of palmic acid) and CCK-8 group (add FFAs and 1 × 10 - 8 mmol/L of CCK-8 simultaneously) .Cell morphologies were observed ;NIT-1 cells proliferations were detected by M TT method ,and apoptosis rates were measured by flow cytometry ;The levels of T-AOC ,GSH-Px ,CAT ,SOD and MDA in supernatant were also measured .Results There were less cell debris in CCK-8 group than FFAs group(all P< 0 .01) ;the OD570 value of CCK-8 group was significant higher than FFAs group(P< 0 .01) ,and the 72 h CCK-8 group was higher than 48 h CCK-8 group(P< 0 .01) .Compared with FFAs group ,the levels of CAT ,T-AOC ,SOD and GSH-Px in CCK-8 group were in-creased and the concentration of MDA was decreased obviously(P< 0 .05) ,the levels of CAT ,SOD in 72 h CCK-8 group were high-er than 48 h CCK-8 group ,MDA was lower than 48 h CCK-8 group(P< 0 .05) .Conclusion CCK-8 could protect islet β cells injury from FFAs through anti-oxidative stress mechanism and promote NIT-1 cells proliferation .