Background: Voltage-gated sodium channel 1.5(Nav1.5) potentially promotes the migratory and invasive behaviors of colon cancer cells. Hitherto, the prognostic significance of Nav1.5 expression remains undetermined. Th...Background: Voltage-gated sodium channel 1.5(Nav1.5) potentially promotes the migratory and invasive behaviors of colon cancer cells. Hitherto, the prognostic significance of Nav1.5 expression remains undetermined. The present study aimed to explore the associations of Nav1.5 expression with clinical outcomes and estrogen receptor-β(ER-β)expression in non-metastatic colon cancer patients receiving radical resection.Methods: A total of 269 consecutive patients with pathologically confirmed stages Ⅰ-Ⅲ colon cancer who underwent radical resection were selected. Nav1.5 and ER-β expression was detected by using immunohistochemistry(IHC)on tissue microarray constructed from paraffin-embedded specimens. IHC score was determined according to the percentage and intensity of positively stained cells. Statistical analysis was performed with the X-tile method, k coefficient, Chi square test or Fisher's exact test, logistic regression, log-rank test, and Cox proportional hazards models.Results: We found that Nav1.5 was commonly expressed in tumor tissues with higher mean IHC score as compared with matched tumor-adjacent normal tissues(5.1 ± 3.5 vs. 3.5 ± 2.7, P < 0.001).The high expression of Nav1.5 in colon cancer tissues was associated with high preoperative carcinoembryonic antigen level [odds ratio(OR) = 2.980;95% confidential interval(CI)1.163-7.632; P = 0.023] and high ER-β expression(OR = 2.808; 95% CI 1.243-6.343;p = 0.00 3). Log-rank test results showed that high Nav1.5 expression contributed to a low 5-year disease-free survival(DFS) rate in colon cancer patients(77.2% vs. 92.1%, P = 0.048), especially in patients with high ER-β expression tumor(76.2% vs. 91.3%, P = 0.032). Analysis with Cox proportional hazards model demonstrated that high Nav1.5 expression[hazard ratio(HR) = 2.738; 95% CI 1.100-6.819;P = 0.030] and lymph node metastasis(HR = 2.633; 95% CI 1.632-4.248; P < 0.001) were prognostic factors for unfavorable DFS in colon cancer patients.Conclusions: High expression of Nav1.5 was associated with high expression of ER-β and indicated unfavorable oncologic prognosis in patients with non-metastatic colon cancer.展开更多
Voltage-gated sodium channels （VGSCs） are known to be involved in the initiation and progression of many malignancies, and the different subtypes of VGSCs play important roles in the metastasis cascade of many tumor...Voltage-gated sodium channels （VGSCs） are known to be involved in the initiation and progression of many malignancies, and the different subtypes of VGSCs play important roles in the metastasis cascade of many tumors. This study investigated the functional expression of Nav1.5 and its effect on invasion behavior of human breast cancer cell line MDA-MB-231. The mRNA and protein expression of Nav1.5 was detected by real time PCR, Western Blot and immunofluorescence. The effects of Nav1.5 on cell proliferation, migration and invasion were respectively assessed by MTT and Transwell. The effects of Nav1.5 on the secretion of matrix metalloproteases （MMPs） by MDA-MB-231 were analyzed by RT-PCR. The over-expressed Nav 1.5 was present on the membrane of MDA-MB-231 cells. The invasion ability in vitro and the MMP-9 mRNA expression were respectively decreased to （47.82±0.53）% and （43.97±0.64）% （P〈0.05） respectively in MDA-MB-23 t cells treated with VGSCs specific inhibitor tetrodotoxin （TTX） by blocking Navl.5 activity. It was concluded that Navl.5 functional expression potentiated the invasive behavior of human breast cancer cell line MDA-MB-231 by increasing the secretion of MMP-9.展开更多
目的:观察异长春花苷内酰胺大剂量注射给药对麻醉Beagle犬心血管系统的影响,并考察其体外对离子通道的抑制作用。方法:采用生理记录仪观察异长春花苷内酰胺静脉注射前后不同时间点Beagle犬收缩压(Sys),舒张压(Dia),平均动脉压(MBP),心率...目的:观察异长春花苷内酰胺大剂量注射给药对麻醉Beagle犬心血管系统的影响,并考察其体外对离子通道的抑制作用。方法:采用生理记录仪观察异长春花苷内酰胺静脉注射前后不同时间点Beagle犬收缩压(Sys),舒张压(Dia),平均动脉压(MBP),心率(HR),心电图PR间期、QRS间期、QT间期、QTcb间期、QTcv间期等指标的变化;应用全细胞膜片钳技术考察不同浓度异长春花苷内酰胺对CHOhERG细胞上hERG钾离子通道和HEK-293-Nav1.5细胞上Nav1.5钠离子通道的抑制作用。结果:与空白对照组相比,异长春花苷内酰胺60、18 mg·kg-1剂量组、溶媒对照组(含吐温-80)于给药后15 min Sys、Dia、MBP、HR明显降低(P<0.05),给药结束后各项指标可见恢复。与溶媒对照组相比,各给药剂量组在各观测时间点无显著性差异。与空白对照组及自身给药前相比,60、18、6 mg·kg-1剂量组、溶媒对照组于给药后15 min QT、QTcb、QTcv间期明显延长(P<0.05),给药结束后可见一定程度的恢复。与溶媒对照组相比,各给药剂量组QT、QTcb和QTcv间期在各观测时间点无显著性差异。异长春花苷内酰胺对hERG钾离子通道和Nav1.5离子通道抑制作用较弱,IC50为560.8μmol·L-1及>900μmol·L-1,远远大于阳性对照药。结论:异长春花苷内酰胺大剂量单次静脉注射对Beagle犬可能有一定的降低血压、减慢心率及延长QT间期的作用,停药后可恢复。其中血压降低、心率减慢与溶媒中所含吐温-80有关。体外对hERG钾离子通道和Nav1.5离子通道无明显影响,提示异长春花苷内酰胺对动物QT间期的影响可能为其它作用机制所致。展开更多
基金supported by a grant from the Sun Yat-sen University Clinical Research 5010 Program(Grant No.2015024)a grant of Guangzhou Science and Technology Plan Projects(Health Medical Collaborative Innovation Program of Guangzhou)(Grant No.201400000001-4)a grant of National Natural Science Foundation of China(Grant No.81772595)
文摘Background: Voltage-gated sodium channel 1.5(Nav1.5) potentially promotes the migratory and invasive behaviors of colon cancer cells. Hitherto, the prognostic significance of Nav1.5 expression remains undetermined. The present study aimed to explore the associations of Nav1.5 expression with clinical outcomes and estrogen receptor-β(ER-β)expression in non-metastatic colon cancer patients receiving radical resection.Methods: A total of 269 consecutive patients with pathologically confirmed stages Ⅰ-Ⅲ colon cancer who underwent radical resection were selected. Nav1.5 and ER-β expression was detected by using immunohistochemistry(IHC)on tissue microarray constructed from paraffin-embedded specimens. IHC score was determined according to the percentage and intensity of positively stained cells. Statistical analysis was performed with the X-tile method, k coefficient, Chi square test or Fisher's exact test, logistic regression, log-rank test, and Cox proportional hazards models.Results: We found that Nav1.5 was commonly expressed in tumor tissues with higher mean IHC score as compared with matched tumor-adjacent normal tissues(5.1 ± 3.5 vs. 3.5 ± 2.7, P < 0.001).The high expression of Nav1.5 in colon cancer tissues was associated with high preoperative carcinoembryonic antigen level [odds ratio(OR) = 2.980;95% confidential interval(CI)1.163-7.632; P = 0.023] and high ER-β expression(OR = 2.808; 95% CI 1.243-6.343;p = 0.00 3). Log-rank test results showed that high Nav1.5 expression contributed to a low 5-year disease-free survival(DFS) rate in colon cancer patients(77.2% vs. 92.1%, P = 0.048), especially in patients with high ER-β expression tumor(76.2% vs. 91.3%, P = 0.032). Analysis with Cox proportional hazards model demonstrated that high Nav1.5 expression[hazard ratio(HR) = 2.738; 95% CI 1.100-6.819;P = 0.030] and lymph node metastasis(HR = 2.633; 95% CI 1.632-4.248; P < 0.001) were prognostic factors for unfavorable DFS in colon cancer patients.Conclusions: High expression of Nav1.5 was associated with high expression of ER-β and indicated unfavorable oncologic prognosis in patients with non-metastatic colon cancer.
文摘Voltage-gated sodium channels （VGSCs） are known to be involved in the initiation and progression of many malignancies, and the different subtypes of VGSCs play important roles in the metastasis cascade of many tumors. This study investigated the functional expression of Nav1.5 and its effect on invasion behavior of human breast cancer cell line MDA-MB-231. The mRNA and protein expression of Nav1.5 was detected by real time PCR, Western Blot and immunofluorescence. The effects of Nav1.5 on cell proliferation, migration and invasion were respectively assessed by MTT and Transwell. The effects of Nav1.5 on the secretion of matrix metalloproteases （MMPs） by MDA-MB-231 were analyzed by RT-PCR. The over-expressed Nav 1.5 was present on the membrane of MDA-MB-231 cells. The invasion ability in vitro and the MMP-9 mRNA expression were respectively decreased to （47.82±0.53）% and （43.97±0.64）% （P〈0.05） respectively in MDA-MB-23 t cells treated with VGSCs specific inhibitor tetrodotoxin （TTX） by blocking Navl.5 activity. It was concluded that Navl.5 functional expression potentiated the invasive behavior of human breast cancer cell line MDA-MB-231 by increasing the secretion of MMP-9.
文摘目的:观察异长春花苷内酰胺大剂量注射给药对麻醉Beagle犬心血管系统的影响,并考察其体外对离子通道的抑制作用。方法:采用生理记录仪观察异长春花苷内酰胺静脉注射前后不同时间点Beagle犬收缩压(Sys),舒张压(Dia),平均动脉压(MBP),心率(HR),心电图PR间期、QRS间期、QT间期、QTcb间期、QTcv间期等指标的变化;应用全细胞膜片钳技术考察不同浓度异长春花苷内酰胺对CHOhERG细胞上hERG钾离子通道和HEK-293-Nav1.5细胞上Nav1.5钠离子通道的抑制作用。结果:与空白对照组相比,异长春花苷内酰胺60、18 mg·kg-1剂量组、溶媒对照组(含吐温-80)于给药后15 min Sys、Dia、MBP、HR明显降低(P<0.05),给药结束后各项指标可见恢复。与溶媒对照组相比,各给药剂量组在各观测时间点无显著性差异。与空白对照组及自身给药前相比,60、18、6 mg·kg-1剂量组、溶媒对照组于给药后15 min QT、QTcb、QTcv间期明显延长(P<0.05),给药结束后可见一定程度的恢复。与溶媒对照组相比,各给药剂量组QT、QTcb和QTcv间期在各观测时间点无显著性差异。异长春花苷内酰胺对hERG钾离子通道和Nav1.5离子通道抑制作用较弱,IC50为560.8μmol·L-1及>900μmol·L-1,远远大于阳性对照药。结论:异长春花苷内酰胺大剂量单次静脉注射对Beagle犬可能有一定的降低血压、减慢心率及延长QT间期的作用,停药后可恢复。其中血压降低、心率减慢与溶媒中所含吐温-80有关。体外对hERG钾离子通道和Nav1.5离子通道无明显影响,提示异长春花苷内酰胺对动物QT间期的影响可能为其它作用机制所致。
