Objective: To investigate the cytotoxic effects and the potential mechanisms of crebanine N-oxide in SGC-7901 gastric adenocarcinoma cells. Methods: The cytotoxicity of crebanine N-oxide was evaluated by 3-(4,5-dimeth...Objective: To investigate the cytotoxic effects and the potential mechanisms of crebanine N-oxide in SGC-7901 gastric adenocarcinoma cells. Methods: The cytotoxicity of crebanine N-oxide was evaluated by 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide assay and cellular morphology was observed under a microscope. Cell apoptosis was determined by flow cytometry using propidium iodide staining. The expression levels of apoptotic-related proteins, cleaved caspase-3, cytochrome C, p53 and Bax, and autophagyrelated proteins p62, beclin1 and LC3 were detected by Western blotting assays. Results: Crebanine N-oxide treatment significantly inhibited the proliferation of SGC-7901 cells in a dose-dependent and timedependent manner via induction of G2-phase cell cycle arrest, apoptosis, and autophagy in SGC-7901 cells.Conclusions: Crebanine N-oxide could inhibit the growth of gastric cancer cells by promoting apoptosis and autophagy and could be used as a potential agent for treating gastric cancer.展开更多
AIM: To study the effects of crebanine on voltage-gated Na+ channels in cardiac tissues. METHODS: Single ventricular myocytes were enzymatically dissociated from adult guinea-pig heart. Voltage-dependent Na+ current w...AIM: To study the effects of crebanine on voltage-gated Na+ channels in cardiac tissues. METHODS: Single ventricular myocytes were enzymatically dissociated from adult guinea-pig heart. Voltage-dependent Na+ current was recorded using the whole cell voltage-clamp technique. RESULTS: Crebanine reversibly inhibited Na+ current with an IC50 value of 0.283 mmol?L-1(95% confidence range: 0.248-0.318 mmol?L-1). Crebanine at 0.262 mmol?L-1 caused a negative shift(about 12 mV) in the voltage-dependence of steady-state inactivation of Na+ current, and retarded its recovery from inactivation, but did not affect its activation curve. CONCLUSION: In addition to blocking other voltage-gated ion channels, crebanine blocked Na+ channels in guinea-pig ventricular myocytes. Crebanine acted as an inactivation stabilizer of Na+ channels in cardiac tissues.展开更多
基金supported by the National Natural Science Foundation of China(NO.81760628).
文摘Objective: To investigate the cytotoxic effects and the potential mechanisms of crebanine N-oxide in SGC-7901 gastric adenocarcinoma cells. Methods: The cytotoxicity of crebanine N-oxide was evaluated by 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide assay and cellular morphology was observed under a microscope. Cell apoptosis was determined by flow cytometry using propidium iodide staining. The expression levels of apoptotic-related proteins, cleaved caspase-3, cytochrome C, p53 and Bax, and autophagyrelated proteins p62, beclin1 and LC3 were detected by Western blotting assays. Results: Crebanine N-oxide treatment significantly inhibited the proliferation of SGC-7901 cells in a dose-dependent and timedependent manner via induction of G2-phase cell cycle arrest, apoptosis, and autophagy in SGC-7901 cells.Conclusions: Crebanine N-oxide could inhibit the growth of gastric cancer cells by promoting apoptosis and autophagy and could be used as a potential agent for treating gastric cancer.
基金supported by the Natural Science Foundation of Yunnan Province(No.2002C0006Z)National Natural Science Foundation of China(No.81060371)
文摘AIM: To study the effects of crebanine on voltage-gated Na+ channels in cardiac tissues. METHODS: Single ventricular myocytes were enzymatically dissociated from adult guinea-pig heart. Voltage-dependent Na+ current was recorded using the whole cell voltage-clamp technique. RESULTS: Crebanine reversibly inhibited Na+ current with an IC50 value of 0.283 mmol?L-1(95% confidence range: 0.248-0.318 mmol?L-1). Crebanine at 0.262 mmol?L-1 caused a negative shift(about 12 mV) in the voltage-dependence of steady-state inactivation of Na+ current, and retarded its recovery from inactivation, but did not affect its activation curve. CONCLUSION: In addition to blocking other voltage-gated ion channels, crebanine blocked Na+ channels in guinea-pig ventricular myocytes. Crebanine acted as an inactivation stabilizer of Na+ channels in cardiac tissues.