内皮素受体B在黑素瘤中的表达及内皮素3对黑素瘤细胞A375的体外促生长效应

目的 研究内皮素受体B（ETR－B）在人恶性黑素瘤中的表达及内皮素3对黑素瘤细胞A375的体外促生长效应。方法 采用免疫组化SP法检测ETR－B在黑素瘤组织中的表达，用RT-PCR法检测ETR－B基因在人恶性黑素瘤细胞A375和SK－mel－1中的表达，用MTT比色法检测不同浓度内皮素3对黑素瘤细胞A375的体外促增殖活性。结果 ETR-B在41例恶性黑素瘤和23例色素痣中的阳性率分别为78.05%和8.69%，两组间差异有统计学意义，P < 0.05。15例原位和26例Ⅰ ~ Ⅳ期恶性黑素瘤ETR-B阳性表达率分别为53.33%和92.31%，两组比较，P < 0.05。13例转移性恶性黑素瘤（Ⅲ ~ Ⅳ期）中ETR-B阳性表达率100%，28例未转移者（0 ~ Ⅱ期）的阳性表达率为67.86%，两组比较，P < 0.05。ETR－B基因在人恶性黑素瘤细胞A375和SK－mel－1中均有表达；内皮素3对黑素瘤细胞A375在体外具有很强的促增殖作用，且促增殖能力呈内皮素3浓度依赖性。结论 内皮素3/ETR－B在促黑素瘤细胞生长中有重要作用     

内皮素对黑素瘤A375细胞转化生长因子-β1及磷酸化Smad 3蛋白表达的调节

目的 探讨内皮索家族(ET)对恶性黑素瘤(MM)A375细胞转化生长因子betal(TGF-β1)表达的差异性调节及对TGF-β信号通路蛋白smad 3磷酸化水平的影响.方法 ELISA、RT-PCR技术测定不同浓度ET-1、ET-3(0、0.1、1、10、100 nmol/L)及其与内皮索受体阻断剂BQ123、BQ788联合干预下MM细胞TGF-β1在蛋白质和mRNA水平的表达.Western印迹法检测联合干预下A375细胞Smad 3蛋白磷酸化的表达.结果 ET-1对A375细胞(105细胞)TGF-β1蛋白表达的影响呈浓度依赖性上调,100 nmol/L浓度下达1289.38±89.42 ng/L(P<0.05);ET-3的作用与此相反,100 nmol/L浓度下表达仅为85.09±9.37 ng/L(P<0.05).BQ123明显阻断ET-1上调TGF-β1的效应(P<0.05),BQ788对此差异无统计学意义(P＞0.05);联合干预下,在TGF-β1 mRNA水平也表现出相同的趋势.Western印迹法检测磷酸化smad 3蛋白(P-smad 3)表达显示,ET-1显著上调P-Smad 3的表达(P<0.05),BQ123干预下其表达水平接近对照组(P＞0.05),BQ788不能阻断其对P-Smad 3表达的上调(P＞0.05);ET-3则明显抑制P-Smad 3的表达(P<0.05).结论 ET-1可诱导MM A375细胞TGF-β1的高表达,ET-3有相反的作用.ET受体-A介导ET-1诱导的TGF-β通路信号蛋白Smad 3的磷酸化.     

内皮素对黑素瘤A375细胞转化生长因子-β1及磷酸化Smad 3蛋白表达的调节

Objective To investigate the effects ofendothelin-1 (ET-1) and endothelin-3 (ET-3) on the expression of transformation growth factor-beta 1 (TGF-β1) and phosphorylation of Smad 3 in malignant melanoma cell line, A375. Methods Cultured A375 cells were classified into 5 groups, i.e. control group (no stimulation), ET-1 group (stimulated with ET-1), ET-1+BQ123 group (treated with ET-1 and BQ123),ET-1 + BQ788 group (treated with ET-1 and BQ788), ET-3 group (stimulated with ET-3), to receive different stimulation. The working concentrations were 0, 0.1, 1, 10, 100 nmol/L for ET-1 and ET-3, 10 μmol/L for BQ123 and BQ788. After another 12- and 24-hour culture, ELISA, RT-PCR and Western blot were used to detect the expression of TGF-β1 protein and mRNA as well as phosphorylated Smad 3 (P-Smad 3). Results The expression of TGF-β1 in A375 cells was up-regulated by ET-1, but down-regulated by ET-3, and both of the effects were in a concentration-dependent manner. Under the stimulation with ET-1 and ET-3 of 100 nmol/L, the level of TGF-β1 reached 1289.38 ± 89.42 ng/L per 105 cells and 85.09 ± 9.37 ng/L per 105 cells, respectively, significantly different from that in unstimulated cells (both P < 0.05). BQ123 signifi-cantly blocked the up-regnlatory effect of ET-1 on the expression TGF-β1 protein(P < 0.05), but BQ788 had no significant influence on the effect, so was the case with TGF-β1 mRNA. Western blot revealed that ET-1significantly elevated the expression of P-Smad 3 in A375 cells (P <0.05), and the elevation was significantly inhibited by BQ123, but not by BQ788. The expression of P-Smad 3 was statistically decreased by ET-3 in A375 cells (P <0.05). Conclusions The expression of TGF-β1 could be enhanced by ET-1, but suppressed by ET-3. It is likely that endothelin receptor A mediates the phosphorylation of Smad 3 induced by ET-1.     

内皮素对黑素瘤A375细胞转化生长因子-β1及磷酸化Smad 3蛋白表达的调节

Objective To investigate the effects ofendothelin-1 (ET-1) and endothelin-3 (ET-3) on the expression of transformation growth factor-beta 1 (TGF-β1) and phosphorylation of Smad 3 in malignant melanoma cell line, A375. Methods Cultured A375 cells were classified into 5 groups, i.e. control group (no stimulation), ET-1 group (stimulated with ET-1), ET-1+BQ123 group (treated with ET-1 and BQ123),ET-1 + BQ788 group (treated with ET-1 and BQ788), ET-3 group (stimulated with ET-3), to receive different stimulation. The working concentrations were 0, 0.1, 1, 10, 100 nmol/L for ET-1 and ET-3, 10 μmol/L for BQ123 and BQ788. After another 12- and 24-hour culture, ELISA, RT-PCR and Western blot were used to detect the expression of TGF-β1 protein and mRNA as well as phosphorylated Smad 3 (P-Smad 3). Results The expression of TGF-β1 in A375 cells was up-regulated by ET-1, but down-regulated by ET-3, and both of the effects were in a concentration-dependent manner. Under the stimulation with ET-1 and ET-3 of 100 nmol/L, the level of TGF-β1 reached 1289.38 ± 89.42 ng/L per 105 cells and 85.09 ± 9.37 ng/L per 105 cells, respectively, significantly different from that in unstimulated cells (both P < 0.05). BQ123 signifi-cantly blocked the up-regnlatory effect of ET-1 on the expression TGF-β1 protein(P < 0.05), but BQ788 had no significant influence on the effect, so was the case with TGF-β1 mRNA. Western blot revealed that ET-1significantly elevated the expression of P-Smad 3 in A375 cells (P <0.05), and the elevation was significantly inhibited by BQ123, but not by BQ788. The expression of P-Smad 3 was statistically decreased by ET-3 in A375 cells (P <0.05). Conclusions The expression of TGF-β1 could be enhanced by ET-1, but suppressed by ET-3. It is likely that endothelin receptor A mediates the phosphorylation of Smad 3 induced by ET-1.     

内皮素对黑素瘤A375细胞转化生长因子-β1及磷酸化Smad 3蛋白表达的调节

Objective To investigate the effects ofendothelin-1 (ET-1) and endothelin-3 (ET-3) on the expression of transformation growth factor-beta 1 (TGF-β1) and phosphorylation of Smad 3 in malignant melanoma cell line, A375. Methods Cultured A375 cells were classified into 5 groups, i.e. control group (no stimulation), ET-1 group (stimulated with ET-1), ET-1+BQ123 group (treated with ET-1 and BQ123),ET-1 + BQ788 group (treated with ET-1 and BQ788), ET-3 group (stimulated with ET-3), to receive different stimulation. The working concentrations were 0, 0.1, 1, 10, 100 nmol/L for ET-1 and ET-3, 10 μmol/L for BQ123 and BQ788. After another 12- and 24-hour culture, ELISA, RT-PCR and Western blot were used to detect the expression of TGF-β1 protein and mRNA as well as phosphorylated Smad 3 (P-Smad 3). Results The expression of TGF-β1 in A375 cells was up-regulated by ET-1, but down-regulated by ET-3, and both of the effects were in a concentration-dependent manner. Under the stimulation with ET-1 and ET-3 of 100 nmol/L, the level of TGF-β1 reached 1289.38 ± 89.42 ng/L per 105 cells and 85.09 ± 9.37 ng/L per 105 cells, respectively, significantly different from that in unstimulated cells (both P < 0.05). BQ123 signifi-cantly blocked the up-regnlatory effect of ET-1 on the expression TGF-β1 protein(P < 0.05), but BQ788 had no significant influence on the effect, so was the case with TGF-β1 mRNA. Western blot revealed that ET-1significantly elevated the expression of P-Smad 3 in A375 cells (P <0.05), and the elevation was significantly inhibited by BQ123, but not by BQ788. The expression of P-Smad 3 was statistically decreased by ET-3 in A375 cells (P <0.05). Conclusions The expression of TGF-β1 could be enhanced by ET-1, but suppressed by ET-3. It is likely that endothelin receptor A mediates the phosphorylation of Smad 3 induced by ET-1.     

内皮素对黑素瘤A375细胞转化生长因子-β1及磷酸化Smad 3蛋白表达的调节

Objective To investigate the effects ofendothelin-1 (ET-1) and endothelin-3 (ET-3) on the expression of transformation growth factor-beta 1 (TGF-β1) and phosphorylation of Smad 3 in malignant melanoma cell line, A375. Methods Cultured A375 cells were classified into 5 groups, i.e. control group (no stimulation), ET-1 group (stimulated with ET-1), ET-1+BQ123 group (treated with ET-1 and BQ123),ET-1 + BQ788 group (treated with ET-1 and BQ788), ET-3 group (stimulated with ET-3), to receive different stimulation. The working concentrations were 0, 0.1, 1, 10, 100 nmol/L for ET-1 and ET-3, 10 μmol/L for BQ123 and BQ788. After another 12- and 24-hour culture, ELISA, RT-PCR and Western blot were used to detect the expression of TGF-β1 protein and mRNA as well as phosphorylated Smad 3 (P-Smad 3). Results The expression of TGF-β1 in A375 cells was up-regulated by ET-1, but down-regulated by ET-3, and both of the effects were in a concentration-dependent manner. Under the stimulation with ET-1 and ET-3 of 100 nmol/L, the level of TGF-β1 reached 1289.38 ± 89.42 ng/L per 105 cells and 85.09 ± 9.37 ng/L per 105 cells, respectively, significantly different from that in unstimulated cells (both P < 0.05). BQ123 signifi-cantly blocked the up-regnlatory effect of ET-1 on the expression TGF-β1 protein(P < 0.05), but BQ788 had no significant influence on the effect, so was the case with TGF-β1 mRNA. Western blot revealed that ET-1significantly elevated the expression of P-Smad 3 in A375 cells (P <0.05), and the elevation was significantly inhibited by BQ123, but not by BQ788. The expression of P-Smad 3 was statistically decreased by ET-3 in A375 cells (P <0.05). Conclusions The expression of TGF-β1 could be enhanced by ET-1, but suppressed by ET-3. It is likely that endothelin receptor A mediates the phosphorylation of Smad 3 induced by ET-1.     

内皮素对黑素瘤A375细胞转化生长因子-β1及磷酸化Smad 3蛋白表达的调节

Objective To investigate the effects ofendothelin-1 (ET-1) and endothelin-3 (ET-3) on the expression of transformation growth factor-beta 1 (TGF-β1) and phosphorylation of Smad 3 in malignant melanoma cell line, A375. Methods Cultured A375 cells were classified into 5 groups, i.e. control group (no stimulation), ET-1 group (stimulated with ET-1), ET-1+BQ123 group (treated with ET-1 and BQ123),ET-1 + BQ788 group (treated with ET-1 and BQ788), ET-3 group (stimulated with ET-3), to receive different stimulation. The working concentrations were 0, 0.1, 1, 10, 100 nmol/L for ET-1 and ET-3, 10 μmol/L for BQ123 and BQ788. After another 12- and 24-hour culture, ELISA, RT-PCR and Western blot were used to detect the expression of TGF-β1 protein and mRNA as well as phosphorylated Smad 3 (P-Smad 3). Results The expression of TGF-β1 in A375 cells was up-regulated by ET-1, but down-regulated by ET-3, and both of the effects were in a concentration-dependent manner. Under the stimulation with ET-1 and ET-3 of 100 nmol/L, the level of TGF-β1 reached 1289.38 ± 89.42 ng/L per 105 cells and 85.09 ± 9.37 ng/L per 105 cells, respectively, significantly different from that in unstimulated cells (both P < 0.05). BQ123 signifi-cantly blocked the up-regnlatory effect of ET-1 on the expression TGF-β1 protein(P < 0.05), but BQ788 had no significant influence on the effect, so was the case with TGF-β1 mRNA. Western blot revealed that ET-1significantly elevated the expression of P-Smad 3 in A375 cells (P <0.05), and the elevation was significantly inhibited by BQ123, but not by BQ788. The expression of P-Smad 3 was statistically decreased by ET-3 in A375 cells (P <0.05). Conclusions The expression of TGF-β1 could be enhanced by ET-1, but suppressed by ET-3. It is likely that endothelin receptor A mediates the phosphorylation of Smad 3 induced by ET-1.     

内皮素对黑素瘤A375细胞转化生长因子-β1及磷酸化Smad 3蛋白表达的调节

Objective To investigate the effects ofendothelin-1 (ET-1) and endothelin-3 (ET-3) on the expression of transformation growth factor-beta 1 (TGF-β1) and phosphorylation of Smad 3 in malignant melanoma cell line, A375. Methods Cultured A375 cells were classified into 5 groups, i.e. control group (no stimulation), ET-1 group (stimulated with ET-1), ET-1+BQ123 group (treated with ET-1 and BQ123),ET-1 + BQ788 group (treated with ET-1 and BQ788), ET-3 group (stimulated with ET-3), to receive different stimulation. The working concentrations were 0, 0.1, 1, 10, 100 nmol/L for ET-1 and ET-3, 10 μmol/L for BQ123 and BQ788. After another 12- and 24-hour culture, ELISA, RT-PCR and Western blot were used to detect the expression of TGF-β1 protein and mRNA as well as phosphorylated Smad 3 (P-Smad 3). Results The expression of TGF-β1 in A375 cells was up-regulated by ET-1, but down-regulated by ET-3, and both of the effects were in a concentration-dependent manner. Under the stimulation with ET-1 and ET-3 of 100 nmol/L, the level of TGF-β1 reached 1289.38 ± 89.42 ng/L per 105 cells and 85.09 ± 9.37 ng/L per 105 cells, respectively, significantly different from that in unstimulated cells (both P < 0.05). BQ123 signifi-cantly blocked the up-regnlatory effect of ET-1 on the expression TGF-β1 protein(P < 0.05), but BQ788 had no significant influence on the effect, so was the case with TGF-β1 mRNA. Western blot revealed that ET-1significantly elevated the expression of P-Smad 3 in A375 cells (P <0.05), and the elevation was significantly inhibited by BQ123, but not by BQ788. The expression of P-Smad 3 was statistically decreased by ET-3 in A375 cells (P <0.05). Conclusions The expression of TGF-β1 could be enhanced by ET-1, but suppressed by ET-3. It is likely that endothelin receptor A mediates the phosphorylation of Smad 3 induced by ET-1.     

内皮素对黑素瘤A375细胞转化生长因子-β1及磷酸化Smad 3蛋白表达的调节

Objective To investigate the effects ofendothelin-1 (ET-1) and endothelin-3 (ET-3) on the expression of transformation growth factor-beta 1 (TGF-β1) and phosphorylation of Smad 3 in malignant melanoma cell line, A375. Methods Cultured A375 cells were classified into 5 groups, i.e. control group (no stimulation), ET-1 group (stimulated with ET-1), ET-1+BQ123 group (treated with ET-1 and BQ123),ET-1 + BQ788 group (treated with ET-1 and BQ788), ET-3 group (stimulated with ET-3), to receive different stimulation. The working concentrations were 0, 0.1, 1, 10, 100 nmol/L for ET-1 and ET-3, 10 μmol/L for BQ123 and BQ788. After another 12- and 24-hour culture, ELISA, RT-PCR and Western blot were used to detect the expression of TGF-β1 protein and mRNA as well as phosphorylated Smad 3 (P-Smad 3). Results The expression of TGF-β1 in A375 cells was up-regulated by ET-1, but down-regulated by ET-3, and both of the effects were in a concentration-dependent manner. Under the stimulation with ET-1 and ET-3 of 100 nmol/L, the level of TGF-β1 reached 1289.38 ± 89.42 ng/L per 105 cells and 85.09 ± 9.37 ng/L per 105 cells, respectively, significantly different from that in unstimulated cells (both P < 0.05). BQ123 signifi-cantly blocked the up-regnlatory effect of ET-1 on the expression TGF-β1 protein(P < 0.05), but BQ788 had no significant influence on the effect, so was the case with TGF-β1 mRNA. Western blot revealed that ET-1significantly elevated the expression of P-Smad 3 in A375 cells (P <0.05), and the elevation was significantly inhibited by BQ123, but not by BQ788. The expression of P-Smad 3 was statistically decreased by ET-3 in A375 cells (P <0.05). Conclusions The expression of TGF-β1 could be enhanced by ET-1, but suppressed by ET-3. It is likely that endothelin receptor A mediates the phosphorylation of Smad 3 induced by ET-1.     

内皮素对黑素瘤A375细胞转化生长因子-β1及磷酸化Smad 3蛋白表达的调节

Objective To investigate the effects ofendothelin-1 (ET-1) and endothelin-3 (ET-3) on the expression of transformation growth factor-beta 1 (TGF-β1) and phosphorylation of Smad 3 in malignant melanoma cell line, A375. Methods Cultured A375 cells were classified into 5 groups, i.e. control group (no stimulation), ET-1 group (stimulated with ET-1), ET-1+BQ123 group (treated with ET-1 and BQ123),ET-1 + BQ788 group (treated with ET-1 and BQ788), ET-3 group (stimulated with ET-3), to receive different stimulation. The working concentrations were 0, 0.1, 1, 10, 100 nmol/L for ET-1 and ET-3, 10 μmol/L for BQ123 and BQ788. After another 12- and 24-hour culture, ELISA, RT-PCR and Western blot were used to detect the expression of TGF-β1 protein and mRNA as well as phosphorylated Smad 3 (P-Smad 3). Results The expression of TGF-β1 in A375 cells was up-regulated by ET-1, but down-regulated by ET-3, and both of the effects were in a concentration-dependent manner. Under the stimulation with ET-1 and ET-3 of 100 nmol/L, the level of TGF-β1 reached 1289.38 ± 89.42 ng/L per 105 cells and 85.09 ± 9.37 ng/L per 105 cells, respectively, significantly different from that in unstimulated cells (both P < 0.05). BQ123 signifi-cantly blocked the up-regnlatory effect of ET-1 on the expression TGF-β1 protein(P < 0.05), but BQ788 had no significant influence on the effect, so was the case with TGF-β1 mRNA. Western blot revealed that ET-1significantly elevated the expression of P-Smad 3 in A375 cells (P <0.05), and the elevation was significantly inhibited by BQ123, but not by BQ788. The expression of P-Smad 3 was statistically decreased by ET-3 in A375 cells (P <0.05). Conclusions The expression of TGF-β1 could be enhanced by ET-1, but suppressed by ET-3. It is likely that endothelin receptor A mediates the phosphorylation of Smad 3 induced by ET-1.     

内皮素对黑素瘤A375细胞转化生长因子-β1及磷酸化Smad 3蛋白表达的调节

Objective To investigate the effects ofendothelin-1 (ET-1) and endothelin-3 (ET-3) on the expression of transformation growth factor-beta 1 (TGF-β1) and phosphorylation of Smad 3 in malignant melanoma cell line, A375. Methods Cultured A375 cells were classified into 5 groups, i.e. control group (no stimulation), ET-1 group (stimulated with ET-1), ET-1+BQ123 group (treated with ET-1 and BQ123),ET-1 + BQ788 group (treated with ET-1 and BQ788), ET-3 group (stimulated with ET-3), to receive different stimulation. The working concentrations were 0, 0.1, 1, 10, 100 nmol/L for ET-1 and ET-3, 10 μmol/L for BQ123 and BQ788. After another 12- and 24-hour culture, ELISA, RT-PCR and Western blot were used to detect the expression of TGF-β1 protein and mRNA as well as phosphorylated Smad 3 (P-Smad 3). Results The expression of TGF-β1 in A375 cells was up-regulated by ET-1, but down-regulated by ET-3, and both of the effects were in a concentration-dependent manner. Under the stimulation with ET-1 and ET-3 of 100 nmol/L, the level of TGF-β1 reached 1289.38 ± 89.42 ng/L per 105 cells and 85.09 ± 9.37 ng/L per 105 cells, respectively, significantly different from that in unstimulated cells (both P < 0.05). BQ123 signifi-cantly blocked the up-regnlatory effect of ET-1 on the expression TGF-β1 protein(P < 0.05), but BQ788 had no significant influence on the effect, so was the case with TGF-β1 mRNA. Western blot revealed that ET-1significantly elevated the expression of P-Smad 3 in A375 cells (P <0.05), and the elevation was significantly inhibited by BQ123, but not by BQ788. The expression of P-Smad 3 was statistically decreased by ET-3 in A375 cells (P <0.05). Conclusions The expression of TGF-β1 could be enhanced by ET-1, but suppressed by ET-3. It is likely that endothelin receptor A mediates the phosphorylation of Smad 3 induced by ET-1.     

内皮素对黑素瘤A375细胞转化生长因子-β1及磷酸化Smad 3蛋白表达的调节

Objective To investigate the effects ofendothelin-1 (ET-1) and endothelin-3 (ET-3) on the expression of transformation growth factor-beta 1 (TGF-β1) and phosphorylation of Smad 3 in malignant melanoma cell line, A375. Methods Cultured A375 cells were classified into 5 groups, i.e. control group (no stimulation), ET-1 group (stimulated with ET-1), ET-1+BQ123 group (treated with ET-1 and BQ123),ET-1 + BQ788 group (treated with ET-1 and BQ788), ET-3 group (stimulated with ET-3), to receive different stimulation. The working concentrations were 0, 0.1, 1, 10, 100 nmol/L for ET-1 and ET-3, 10 μmol/L for BQ123 and BQ788. After another 12- and 24-hour culture, ELISA, RT-PCR and Western blot were used to detect the expression of TGF-β1 protein and mRNA as well as phosphorylated Smad 3 (P-Smad 3). Results The expression of TGF-β1 in A375 cells was up-regulated by ET-1, but down-regulated by ET-3, and both of the effects were in a concentration-dependent manner. Under the stimulation with ET-1 and ET-3 of 100 nmol/L, the level of TGF-β1 reached 1289.38 ± 89.42 ng/L per 105 cells and 85.09 ± 9.37 ng/L per 105 cells, respectively, significantly different from that in unstimulated cells (both P < 0.05). BQ123 signifi-cantly blocked the up-regnlatory effect of ET-1 on the expression TGF-β1 protein(P < 0.05), but BQ788 had no significant influence on the effect, so was the case with TGF-β1 mRNA. Western blot revealed that ET-1significantly elevated the expression of P-Smad 3 in A375 cells (P <0.05), and the elevation was significantly inhibited by BQ123, but not by BQ788. The expression of P-Smad 3 was statistically decreased by ET-3 in A375 cells (P <0.05). Conclusions The expression of TGF-β1 could be enhanced by ET-1, but suppressed by ET-3. It is likely that endothelin receptor A mediates the phosphorylation of Smad 3 induced by ET-1.     

内皮素3上调黑素瘤细胞株A375表达骨桥蛋白的研究

目的 探讨内皮素受体(ETR)-B拮抗剂BQ788和磷脂酰肌醇-3激酶(PI3K)抑制剂LY294002对黑素瘤细胞株A375骨桥蛋白基因的表达。方法 对照组在人A375细胞培养体系中加入100 nmol/L内皮素3,试验组除加入100nmol/L内皮素3外,分别加入1μmol/L BQ788和20μmol/L、50μmol/L LY294002,采用RT-PCR和蛋白质印迹方法检测骨桥蛋白的mRNA和蛋白表达。结果 ETR-B拮抗剂BQ788和PI3K抑制剂LY294002均能显著减少人恶性黑素瘤细胞株A375中骨桥蛋白mRNA和蛋白的表达,与对照组比较,差异均有统计学意义(P<0.05)。高浓度较低浓度LY294002对骨桥蛋白表达的抑制作用更明显(P<0.05)。结论 内皮素3/ETR-B能通过激活PI3K信号通路上调骨桥蛋白的表达。     

A375细胞外信号调节激酶通路与核因子κB通路的交互作用初探

【摘要】 目的 探讨黑素瘤细胞A375细胞外信号调节激酶（ERK）通路与核因子κB（NF-κB）信号转导通路的交互作用。 方法 将培养的A375细胞分为对照组、选择性ERK信号通路抑制剂U0126（10 μmol/L、5 μmol/L）处理组和选择性NF-κB通路抑制剂BMS-345541（10 μmol/L、5 μmol/L）处理组,分别提取蛋白质和mRNA,用Western 印迹、RT-PCR观察U0126抑制ERK通路后,NF-κB P65、p-IκBα蛋白及NF-κB P65 mRNA的表达,观察BMS-345541抑制NF-κB通路后ERK1/2 、p-ERK1/2蛋白及ERK1 mRNA的表达。 结果 应用10 μmol/L、5 μmol/L U0126抑制ERK通路后,胞核NF-κB P65蛋白表达（分别为0.60 ± 0.04、0.56 ± 0.06）均较对照组（1.54 ± 0.15）减少（P < 0.01）,其表达量与药物浓度无显著相关性（P > 0.01）;p-IκBα蛋白的表达（0.90 ± 0.05、0.70 ± 0.02）均较对照组（0.61 ± 0.03）增加（P < 0.01）,两药物浓度组之间的表达量差异有统计学意义（P < 0.01）;NF-κB P65 mRNA的表达（0.79 ± 0.05,0.75 ± 0.04）均较对照组（0.86 ± 0.05）减少（P < 0.01）。应用10 μmol/L BMS-345541抑制NF-κB通路后,ERK1/2、p-ERK1/2蛋白及ERK1 mRNA的表达（0.73 ± 0.07、0.75 ± 0.09、1.51 ± 0.02）较对照组减少（P < 0.01）,BMS-345541浓度为5 μmol/L时,ERK1/2、p-ERK1/2蛋白和ERK1 mRNA的表达（0.94 ± 0.11、0.99 ± 0.04、1.62 ± 0.03）较对照组的差异无统计学意义（均P > 0.05）。 结论 NF-κB通路和ERK通路在黑素瘤A375细胞中存在交互作用。     

内皮抑制素对黑素瘤A375细胞侵袭能力的影响

目的探讨内皮抑制素对体外培养的黑素瘤A375细胞核因子κB(NF-κB)和基质金属蛋白酶-9(MMP9)表达的影响。方法 CCK-8法检测内皮抑制素对A375细胞增殖的抑制作用;Transwell小室试验检测内皮抑制素对A375细胞侵袭能力的影响;逆转录聚合酶链反应(RT-PCR)和Western-blot法分别检测内皮抑制素对A375细胞NF-κB,MMP9 mRNA和二者蛋白表达的影响。结果内皮抑制素对A375细胞增殖抑制作用呈时间-浓度依赖性;20μg/mL内皮抑制素作用A375细胞72h后:细胞穿膜数(21.5±7.3)低于对照组(56.8±6.2);胞内NF-κB,MMP9 mRNA以及二者蛋白表达水平均有明显下降,与对照组相比的差异均有统计学意义(P均<0.05)。结论内皮抑制素可下调NF-κB和MMP9的表达,从而抑制黑素瘤浸润和转移。这为内皮抑制素临床治疗皮肤黑素瘤提供了部分理论依据。     

麦冬皂苷B通过抑制PI3K/Akt/mTOR通路诱导人黑色素瘤A375细胞凋亡

目的探讨麦冬皂苷B对人黑色素瘤(Melanoma)A375细胞增殖,凋亡和细胞周期的影响以及相关机制。方法麦冬皂苷B处理A375细胞后,采用CCK-8法检测细胞活力;流式细胞仪检测A375细胞周期变化及细胞凋亡水平;Hoechst33258荧光染色法观察细胞凋亡形态;免疫印迹法检测麦冬皂苷B对A375细胞PI3K,p-PI3K,AKT,p-AKT蛋白以及通路下游凋亡相关蛋白Bcl-2,Bax,Cleaved-caspase3表达的影响。结果麦冬皂苷B能抑制A375细胞增殖活力及PI3K/Akt/mTOR通路的活化;麦冬皂苷B促进了A375细胞内Bax和Cleaved-caspase 3的表达,抑制Bcl-2表达,诱导人黑色素瘤细胞发生凋亡;麦冬皂苷B阻滞了A375细胞细胞周期,G0/G1期细胞比例明显升高;PI3K/Akt/mTOR通路活化剂IGF-1处理A375细胞后抑制了麦冬皂苷B的上述作用。结论麦冬皂苷B能抑制A375细胞的增殖,诱导细胞发生凋亡,阻滞细胞周期于G0/G1期。     

Nutlin-3对人A375黑素瘤细胞生物学行为的影响及可能机制

目的 观察顺式咪唑啉衍生物nutlin-3对人A375黑素瘤细胞生物学行为的影响,研究其机制。 方法 将A375细胞分为实验组和对照组,实验组细胞接受2.5、5、10 μmol/L nutlin-3处理,对照组细胞采用二甲基亚砜处理。分别于作用24、48、72 h后,噻唑蓝（MTT）法检测细胞增殖情况;Western印迹检测p53蛋白表达的改变;流式细胞仪检测细胞周期分布以及细胞凋亡;Transwell法检测迁移性变化。采用重复测量的方差分析进行统计学检验。 结果 2.5、5、10 μmol/L nutlin-3处理A375细胞24、48、72 h后,MTT法显示不同时间点间的增殖抑制率差异有统计学意义（F = 67.43,P < 0.01）,不同浓度间的抑制率差异有统计学意义（F = 135.58,P < 0.01）,浓度越高抑制率越高;时间和浓度之间有交互作用（F = 26.95,P < 0.01）。Western印迹 、流式细胞仪、Transwell法检测显示,不同时间点之间A375细胞的p53表达、G2期细胞百分率、凋亡率、迁移抑制率差异均有统计学意义（F值分别为1255.00、831.38、809.45、1100.00,均P < 0.01）,除p53外,时间越长各项指标值越高;不同浓度间各项指标值差异均有统计学意义（F值分别为9196.00、267.99、723.83、1667.00,均P < 0.01）,浓度越高各项指标值越高;时间与浓度之间交互作用有统计学意义（F值分别为826.79、21.602、44.48、313.09,均P < 0.01）。 结论 nutlin-3可能通过p53蛋白积累途径抑制人A375细胞的增殖和迁移,促进细胞周期停滞和细胞凋亡。     

姜黄素对THP-1细胞Toll样受体4信号传导通路中相关因子mRNA水平的影响

目的 研究姜黄素对人单核细胞株THP-1 Toll样受体4(TLR4)信号传导通路中相关因子mRNA水平的影响.方法 用不同浓度姜黄素(50、25、12.5 mg/L)预处理THP-1细胞12 h,0.043 mg/L地塞米松处理组作为阳性对照,继而用1 mg/L脂多糖(LPS)刺激诱导细胞4 h,以不做处理的THP-1作为阴性对照,仅用1 mg/L LPS刺激的THP-1作为LPS刺激组.提取细胞总RNA,用RT-PCR方法检测TLR4信号传导通路中TNF受体相关因子(TRAF)6、IL-1受体相关激酶(IRAK1)、核因子κB(NF-κB)mRNA的表达情况.结果 未经处理的THP-1细胞经LPS刺激4 h,可以显著提高TRAF6、IRAK1、NFκB mRNA的表达,与阴性对照组比较,t值分别为38.69、39.13、23.99(P<0.01). 50、25 mg/L姜黄素可以明显抑制THP-1细胞经LPS诱导后TRAF6、IRAK1、NF-κB mRNA的表达(P值均<0.01),抑制率均在50%以上.结论 一定浓度的姜黄素可以抑制LPS诱导后THP-1细胞TRAF6、IRAK1、NF-κB mRNA的表达,表明姜黄素对TLR4信号传导通路中相关因子mRNA水平有调节作用.     

A20蛋白水平影响狼疮模型小鼠TLR2、4-p38MAPK/NF-kB信号通路的初步研究

目的探讨PBMC中高水平的A20(TNFAIP3)蛋白能否抑制TLR2、4-p38MAPK/NF-κB信号通路并缓解SLE小鼠的炎症反应。方法观察MRL/lpr小鼠瑞香素(Daphnetin)处理组一般情况和生存期,检测其尿蛋白含量;检测血清中BUN、anti-dsDNA IgG、IL-6和TNF-α水平;检测PBMC裂解液中A20、TLR2、TLR4、pNFκB-p65及pp38MAPK水平。以上所有指标均与MRL/lpr小鼠未处理组、阴性对照组BALB/c雌性小鼠进行比较。结果随着Daphnetin处理组小鼠PBMC裂解液中A20蛋白水平显著升高(P <0.01),小鼠尿蛋白及血清BUN减少(P <0.001,P <0.001),其生存期(存活率)虽低于阴性对照健康鼠,但明显优于未处理组狼疮鼠(66.7%<88.9%<100%);血清中anti-dsDNA IgG、IL-6和TNF-α水平明显下降(P <0.01,P <0.01,P<0.001);PBMC裂解液中TLR2、TLR4、pNFκB-p65、pp38MAPK水平均有明显下降...     

miR-519d-3p通过调控Toll样受体4/核因子-κB信号通路对前列腺癌细胞的影响机制研究

目的 探讨通过微小RNA-519d-3p(miR-519d-3p)调控Toll样受体4/核因子-κB(TLR4/NF-κB)信号通路对前列腺癌细胞的机制研究。方法 于2021年6月购买前列腺癌细胞株PC3,培养至对数时期,随机分为对照组、下调miR-519d-3p组、上调miR-519d-3p组。采用聚合酶链反应检测miR-519d-3p表达情况,对比干预24h、48h、72h细胞增殖、细胞迁移、侵袭率;检测细胞TLR4/NF-κB信号通路蛋白表达状况。结果 与对照组相比,下调miR-519d-3p组细胞增殖率、细胞侵袭数、迁移数、miR-519d-3p表达量、B淋巴细胞瘤-2基因/Bcl-2相关X基因(Bcl-2/Bax)、TLR4/β-actin、NF-κB/β-actin蛋白表达量上升,细胞凋亡率下降(P<0.05);与下调miR-519d-3p组相比,上调miR-519d-3p组细胞增殖率、细胞侵袭数、迁移数、miR-519d-3p表达量、Bcl-2/Bax、TLR4/β-actin、NF-κB/β-actin蛋白表达量降低,细胞凋亡率升高(P<0.05)。结论 上调miR-519d-3p可抑制前列腺癌细胞的增殖、迁移、侵袭,其作用机制可能与TLR4/NF-κB信号通路相关。