Effect of ropivacaine hydrochloride and its dextroisomer(R)-ropivacaine hydrochloride on hERG currents using manual patch clamp method in HEK293 cells that stably overexpress hERG channel
Objective To compare the effect of ropivacaine hydrochloride and(R)-ropivacaine hydrochloride on the human-ether-a-go-go-related gene(hERG)current in HEK293 cells that stably overexpress hERG potassium channels.Methods Manul patch clamp techniques were employed to investigate the effects of ropivacaine hydrochloride and(R)-ropivacaine hydrochloride on Iherg-tail in the HEK293 cell line that stably overexpresses hERG potassium channels.Results The inhibition rate of ropivacaine hydrochloride on hERG was(6.12±0.30)%,(13.04±1.20)%,(19.21±0.33)%,(35.56±0.66)%and(65.37±4.17)%at the doses of 0.37,1.11,3.33,10.00 and 30.00 μmol·L-1.The half-maximal inhibitory concentration(IC50)of ropivacaine hydrochloride on hERG was 19.482 μmol·L-1(n=15).The inhibition rate of(R)-ropivacaine hydrochloride on hERG was(4.13±3.43)%,(7.34±5.60)%,(9.49±2.75)%,(16.60±0.87)%and(31.36±1.45)%at the doses of 30.00,10.00,1.11 and 0.37 μmol·L-1.The half-maximal inhibitory concentration(IC50)of(R)-ropivacaine hydrochloride on hERG exceeded 30 μmol·L-1(n=15).The inhibition rate of dofetilide on hERG was(7.81±2.77)%,(19.67±1.88)%,(57.16±4.39)%,(89.71±3.55)%and(99.66±0.89)%at the doses of 0.001 85,0.005 56,0.016 67,0.050 00 and 0.150 00 μmol·L-1.The half-maximal inhibitory concentration(IC50)of dofetilide on hERG was 0.015 μmol·L-1(n=15).Conclusion Compared with dofetilide,ropivacaine hydrochloride has weak inhibitory effect on the hERG channel and(R)-ropivacaine hydrochloride has no obvious inhibitory effect on the hERG channel.