World journal of gastroenterology · 2004
Electrophysiological effects of anthopleurin-Q on rat hepatocytes.
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Zhou Hong-Yi, Wang Fang, Zhang Ke-Qiang, Cheng Lan, Zhou Ji, Fu Li-Ying, Yao Wei-Xing
Аннотация
AIM: To study the effects of AP-Q on CCl(4)-induced acute liver injury, delayed outward potassium current (I(K)), inward rectifier potassium current (I(K1)) and calcium release-activated calcium current (I(CRAC)) in isolated rat hepatocytes.
METHODS: A single dose of CCl(4) (10 microg/mL, ip) was injected to induce acute liver injury in rats. Serum aminotransferase activities were determined. Whole cell patch-clamp techniques were used to investigate the effects of AP-Q on delayed outward potassium current (I(K)), inward rectifier potassium current (I(K1)) and calcium release-activated calcium current (I(CRAC)).
RESULTS: AP-Q (3.5 and 7 microg/kg) pretreatment significantly reduced ALT and AST activities. AP-Q 0.1-100 nM produced a concentration-dependent increase of I(K) with EC(50) value of 5.55+/-1.8 nM (n=6). AP-Q 30 nM shifted the I-V curve of I(K) leftward and upward. CCl(4) 4 mM decreased I(K) current 28.6+/-6.5% at 140 mV. After exposure to CCl(4) for 5 min, AP-Q 30 nM attenuated the decrease of I(K) induced by CCl(4) close to normal amplitude. AP-Q 0.01-100 nM had no significant effect on either inward or outward components of I(K1) at any membrane potential examined. AP-Q 0.1-100 nM had no significant influence on the peak amplitude of I(CRAC), either, and did not affect the shape of its current voltage curve.
CONCLUSION: AP-Q has a protective effect on CCl(4)-induced liver injury, probably through selectively increased I(K) in hepatocytes.
METHODS: A single dose of CCl(4) (10 microg/mL, ip) was injected to induce acute liver injury in rats. Serum aminotransferase activities were determined. Whole cell patch-clamp techniques were used to investigate the effects of AP-Q on delayed outward potassium current (I(K)), inward rectifier potassium current (I(K1)) and calcium release-activated calcium current (I(CRAC)).
RESULTS: AP-Q (3.5 and 7 microg/kg) pretreatment significantly reduced ALT and AST activities. AP-Q 0.1-100 nM produced a concentration-dependent increase of I(K) with EC(50) value of 5.55+/-1.8 nM (n=6). AP-Q 30 nM shifted the I-V curve of I(K) leftward and upward. CCl(4) 4 mM decreased I(K) current 28.6+/-6.5% at 140 mV. After exposure to CCl(4) for 5 min, AP-Q 30 nM attenuated the decrease of I(K) induced by CCl(4) close to normal amplitude. AP-Q 0.01-100 nM had no significant effect on either inward or outward components of I(K1) at any membrane potential examined. AP-Q 0.1-100 nM had no significant influence on the peak amplitude of I(CRAC), either, and did not affect the shape of its current voltage curve.
CONCLUSION: AP-Q has a protective effect on CCl(4)-induced liver injury, probably through selectively increased I(K) in hepatocytes.
Предметные рубрики MeSH
Alanine TransaminaseAnimalsAspartate AminotransferasesCalciumCalcium ChannelsCarbon TetrachlorideChemical and Drug Induced Liver InjuryFemaleHepatocytesIntercellular Signaling Peptides and ProteinsLiver DiseasesMaleMembrane PotentialsMiceMice, Inbred StrainsPatch-Clamp TechniquesPeptidesPotassiumPotassium Channels, Inwardly RectifyingRatsRats, Wistar