Objective: To explore the pathophysiological mechanism of the changes in gap junctionalintercellular communication (GJIC) in the myocardial cells after burns. Methods: After the myocardial cellswere cultured and injur...Objective: To explore the pathophysiological mechanism of the changes in gap junctionalintercellular communication (GJIC) in the myocardial cells after burns. Methods: After the myocardial cellswere cultured and injured with hypoxia and burn serum, the GJIC in the cells was detected with scrapeloading and dye transfer. Meanwhile, the viability, cytosolic free Ca2+ concentration and Ca2+ influx of themyocardial cells were determined. Results: The cytosolic free Ca2+ concentration and the cellulartransmembrane Ca2+ influx were significantly increased but the viability of the cells markedly decreased afterthe injury. The LY fluorescence reached 4 rows of cells from the scrape line in the normal myocardial cells.The GJIC was blocked at the first hour after hypoxia or hypoxia and burn serum injury. The LY fluorescencewas limited to the primary loads cells at the sixth hour after hypoxia and the third hour after hypoxia andburn serum injury. Conclusion: The function of GJIC in the myocardial cells is to maintain high ordersynchronous contraction of the myocardium. After burns, the runaway calcium homeostasis and impairmentof GJIC function would be accused to be the pathological basis for myocardial heterogeneous behavior.展开更多
Our previous study has proven that tea polyphenol has a role in lung neoplasms. The present communication was to investage the anti-proliferation effect of tea polyphenol on the PG cells, which was a high metastatic h...Our previous study has proven that tea polyphenol has a role in lung neoplasms. The present communication was to investage the anti-proliferation effect of tea polyphenol on the PG cells, which was a high metastatic human lung carcinoma cell line, by 3-(4,5)-dimethylthiahiazo(-z-y1)-3,5-diphenytetrazoliumromide (MTT) cell viability assay, and to study the change of intracellular calcium concentration, connexin43 (Cx43) expression, gap junctional intercellular communication (GJIC) and cell cycle distribution after the tea polyphenol treatment by laser scanning confocal microscopy and flow cytometry. The results showed that 1) tea polyphenol could kill the PG cells in a dose-depent manner via inhibiting the PG cell proliferation and blocking the PG cell cycle progression staying in G0/G1 phase and not transfering in S and G2/M phases to reduce the PG cell proliferation index;2) the increases of intracellular calcium concentration, GJIC and Cx43 expression were related with the tea polyphenol doses. The data suggested that tea polyphenol could inhibit the growth of PG cells, which mechanism was associated with the up-regulation of GJIC.展开更多
Rhabdomyosarcoma (RD) cells express low levels of the gap junction protein connexin 43 (Cx43), and its mRNA, and display very weak gap junctional intercellular communication (GJIC) as detected by Cx43 immunofluorescen...Rhabdomyosarcoma (RD) cells express low levels of the gap junction protein connexin 43 (Cx43), and its mRNA, and display very weak gap junctional intercellular communication (GJIC) as detected by Cx43 immunofluorescence, slot-blot and dye-transfer methods. These cells grow rapidly and show aberrant and incomplete myogenic differentiation. To investigate the role of gap junctions in these cells, the expression of Cx43 with relation to cell growth and myogenic differentiation in RD single-cell subclones-RDL3 and RDL6 is studied. The subclone RDL3 grows slowly and displays better myogenic differentiation. The expression of Cx43, its mRNA and the GJIC in RDL3 is comparable to that in normal myoblasts. Another subclone RDL6 which grows rapidly, but is poorly differentiated, expresses very low levels of Cx43 and its mRNA, and very weak GJIC. By using the calcium phosphate precipitate transfection technique, a full-length cDNA-encoding Cx43 and a pSV2neo have been introduced into the RDL6 cells. Several展开更多
【目的】探讨丹参酮ⅡA(TanshinoneⅡA)对人胎脐静脉上皮细胞(HUVEC)缝隙连接细胞通讯(GJIC)的影响及其机制。【方法】采用四甲基偶氮唑盐(MTT)法检测丹参酮ⅡA对HUVEC细胞生长的影响,荧光显微镜观察及流式细胞仪荧光示踪法分析GJIC功...【目的】探讨丹参酮ⅡA(TanshinoneⅡA)对人胎脐静脉上皮细胞(HUVEC)缝隙连接细胞通讯(GJIC)的影响及其机制。【方法】采用四甲基偶氮唑盐(MTT)法检测丹参酮ⅡA对HUVEC细胞生长的影响,荧光显微镜观察及流式细胞仪荧光示踪法分析GJIC功能变化,并与阳性对照药全反式维甲酸(ATRA)比较,采用荧光实时定量PCR(q RT-PCR)法分析Cx37、Cx40 m RNA的表达。【结果】丹参酮ⅡA作用HUVEC 24、48 h的半数致死量(IC50)分别为15、8.5μmol/L,32、64μmol/L丹参酮ⅡA作用HUVEC 48 h有明显细胞毒性,抑制率大于70%;选用0、4、8、16、32μmol/L丹参酮ⅡA作用HUVEC48 h,流式细胞仪检测结果显示:各组接受绿色荧光Calcein-AM的细胞数量与总细胞数比值明显升高,其中8、16、32μmol/L组可显著提高GJIC功能(P<0.01)。q RT-PCR分析结果显示:与空白对照组比较,8、16、32μmol/L丹参酮ⅡA组可显著提高Cx37、Cx40 m RNA表达(P<0.05或P<0.01),并有一定的浓度依赖关系。【结论】丹参酮ⅡA能够提高Cx37、Cx40 m RNA表达,这可能是丹参酮ⅡA增强上皮细胞GJIC功能的机制之一。展开更多
文摘Objective: To explore the pathophysiological mechanism of the changes in gap junctionalintercellular communication (GJIC) in the myocardial cells after burns. Methods: After the myocardial cellswere cultured and injured with hypoxia and burn serum, the GJIC in the cells was detected with scrapeloading and dye transfer. Meanwhile, the viability, cytosolic free Ca2+ concentration and Ca2+ influx of themyocardial cells were determined. Results: The cytosolic free Ca2+ concentration and the cellulartransmembrane Ca2+ influx were significantly increased but the viability of the cells markedly decreased afterthe injury. The LY fluorescence reached 4 rows of cells from the scrape line in the normal myocardial cells.The GJIC was blocked at the first hour after hypoxia or hypoxia and burn serum injury. The LY fluorescencewas limited to the primary loads cells at the sixth hour after hypoxia and the third hour after hypoxia andburn serum injury. Conclusion: The function of GJIC in the myocardial cells is to maintain high ordersynchronous contraction of the myocardium. After burns, the runaway calcium homeostasis and impairmentof GJIC function would be accused to be the pathological basis for myocardial heterogeneous behavior.
文摘Our previous study has proven that tea polyphenol has a role in lung neoplasms. The present communication was to investage the anti-proliferation effect of tea polyphenol on the PG cells, which was a high metastatic human lung carcinoma cell line, by 3-(4,5)-dimethylthiahiazo(-z-y1)-3,5-diphenytetrazoliumromide (MTT) cell viability assay, and to study the change of intracellular calcium concentration, connexin43 (Cx43) expression, gap junctional intercellular communication (GJIC) and cell cycle distribution after the tea polyphenol treatment by laser scanning confocal microscopy and flow cytometry. The results showed that 1) tea polyphenol could kill the PG cells in a dose-depent manner via inhibiting the PG cell proliferation and blocking the PG cell cycle progression staying in G0/G1 phase and not transfering in S and G2/M phases to reduce the PG cell proliferation index;2) the increases of intracellular calcium concentration, GJIC and Cx43 expression were related with the tea polyphenol doses. The data suggested that tea polyphenol could inhibit the growth of PG cells, which mechanism was associated with the up-regulation of GJIC.
基金Project supported by the National Natural Science Foundation of China and the exchange program between China and Canada.
文摘Rhabdomyosarcoma (RD) cells express low levels of the gap junction protein connexin 43 (Cx43), and its mRNA, and display very weak gap junctional intercellular communication (GJIC) as detected by Cx43 immunofluorescence, slot-blot and dye-transfer methods. These cells grow rapidly and show aberrant and incomplete myogenic differentiation. To investigate the role of gap junctions in these cells, the expression of Cx43 with relation to cell growth and myogenic differentiation in RD single-cell subclones-RDL3 and RDL6 is studied. The subclone RDL3 grows slowly and displays better myogenic differentiation. The expression of Cx43, its mRNA and the GJIC in RDL3 is comparable to that in normal myoblasts. Another subclone RDL6 which grows rapidly, but is poorly differentiated, expresses very low levels of Cx43 and its mRNA, and very weak GJIC. By using the calcium phosphate precipitate transfection technique, a full-length cDNA-encoding Cx43 and a pSV2neo have been introduced into the RDL6 cells. Several
文摘【目的】探讨丹参酮ⅡA(TanshinoneⅡA)对人胎脐静脉上皮细胞(HUVEC)缝隙连接细胞通讯(GJIC)的影响及其机制。【方法】采用四甲基偶氮唑盐(MTT)法检测丹参酮ⅡA对HUVEC细胞生长的影响,荧光显微镜观察及流式细胞仪荧光示踪法分析GJIC功能变化,并与阳性对照药全反式维甲酸(ATRA)比较,采用荧光实时定量PCR(q RT-PCR)法分析Cx37、Cx40 m RNA的表达。【结果】丹参酮ⅡA作用HUVEC 24、48 h的半数致死量(IC50)分别为15、8.5μmol/L,32、64μmol/L丹参酮ⅡA作用HUVEC 48 h有明显细胞毒性,抑制率大于70%;选用0、4、8、16、32μmol/L丹参酮ⅡA作用HUVEC48 h,流式细胞仪检测结果显示:各组接受绿色荧光Calcein-AM的细胞数量与总细胞数比值明显升高,其中8、16、32μmol/L组可显著提高GJIC功能(P<0.01)。q RT-PCR分析结果显示:与空白对照组比较,8、16、32μmol/L丹参酮ⅡA组可显著提高Cx37、Cx40 m RNA表达(P<0.05或P<0.01),并有一定的浓度依赖关系。【结论】丹参酮ⅡA能够提高Cx37、Cx40 m RNA表达,这可能是丹参酮ⅡA增强上皮细胞GJIC功能的机制之一。
