目的通过分析氧化应激损伤的凋亡HEI-OC1细胞各信号转导及转录激活子(signal transducers and activators of transcription,STATs)的表达,探讨酪氨酸激酶-信号转导及转录激活子(janus kinase-signal transducers and activators of tra...目的通过分析氧化应激损伤的凋亡HEI-OC1细胞各信号转导及转录激活子(signal transducers and activators of transcription,STATs)的表达,探讨酪氨酸激酶-信号转导及转录激活子(janus kinase-signal transducers and activators of transcription,JAK-STATs)信号通路在毛细胞凋亡中的生物学作用。方法采用不同浓度(0、20、40、60 μM)叔丁基过氧化氢(tert-butyl hydroperoxide,t-BHP)染毒构建HEI-OC1细胞株凋亡模型(0μM浓度为对照组),Annexin V-FITC/PI法检测20、40、60 μM浓度t-BHP染毒组细胞凋亡水平,实时荧光定量PCR检测STATs mRNA表达水平。结果对照组及20、40、60 μM t-BHP染毒组的细胞凋亡率分别为3.9%、7.4%、32.0%、91.2%;与对照组相比,各浓度T-BHP染毒组STAT1mRNA、STAT3mRNA、STAT5mRNA、STAT6 mRNA的表达水平均显著性下降(分别为F=5 534.302,P<0.01;F=146.038,P<0.01;F=685.929,P<0.01;F=516.11,P<0.01),各浓度t-BHP染毒组间差异无统计学意义(P>0.05);与对照组相比各浓度t-BHP染毒组STAT2mRNA的表达水平均有显著变化(F=1 259.148,P<0.01),20 μM染毒组STAT2 mRNA的表达水平明显下降(P<0.01),但40、60 μM染毒组均明显升高(P<0.01);STAT4 mRNA在HEI-OC1细胞株中未见表达。结论 JAK-STAT2信号通路具有促进毛细胞氧化应急损伤凋亡的生物学作用,JAK-STAT1/STAT3/STAT5/STAT6信号通路有抑制毛细胞氧化应急损伤凋亡的生物学作用。展开更多
Cisplatin(CDDP)-induced ototoxicity is one of the common adverse effects of cisplatin chemotherapy.Thus far,effective approaches for attenuating hearing loss are unavailable in clinical practice.Mitochondrial biogenes...Cisplatin(CDDP)-induced ototoxicity is one of the common adverse effects of cisplatin chemotherapy.Thus far,effective approaches for attenuating hearing loss are unavailable in clinical practice.Mitochondrial biogenesis acts as a master element of mitochondrial health and is necessary for mitochondrial quality control.The current study examined whether mitochondrial biogenesis is involved in CDDP-induced ototoxicity.Herein,we showed that CDDP damaged mitochondrial function and caused death of House Ear Institute-Organ of Corti 1(HEI-OC1)cells by impairing mitochondrial biogenesis.Moreover,overexpression of peroxisome proliferatoractivated receptor-g coactivator-1a,a key factor in mitochondrial biogenesis,promoted mitochondrial biogenesis in HEI-OC1 cells and protected them against CDDP-induced cytotoxicity.These findings suggest that mitochondrial biogenesis is involved in the pathology of CDDP cytotoxicity of HEI-OC1 cells,and activation of peroxisome proliferator-activated receptor-g coactivator-1a can be considered a potential therapeutic strategy to attenuate CDDP-mediated ototoxicity.展开更多
基金supported by the Project funded by China Postdoctoral Science Foundation(No.2018M640863 to JP)the National Natural Science Foundation of China(No.81771018,81570935,81570916,and 81873699 to HX and YZ)+1 种基金the Guangdong Natural Science Foundation of China(No.2015A030313084 and 2017A030313585 to HX)Yixian Research Launch Project of China(No.YXQH201807 to HX).
文摘Cisplatin(CDDP)-induced ototoxicity is one of the common adverse effects of cisplatin chemotherapy.Thus far,effective approaches for attenuating hearing loss are unavailable in clinical practice.Mitochondrial biogenesis acts as a master element of mitochondrial health and is necessary for mitochondrial quality control.The current study examined whether mitochondrial biogenesis is involved in CDDP-induced ototoxicity.Herein,we showed that CDDP damaged mitochondrial function and caused death of House Ear Institute-Organ of Corti 1(HEI-OC1)cells by impairing mitochondrial biogenesis.Moreover,overexpression of peroxisome proliferatoractivated receptor-g coactivator-1a,a key factor in mitochondrial biogenesis,promoted mitochondrial biogenesis in HEI-OC1 cells and protected them against CDDP-induced cytotoxicity.These findings suggest that mitochondrial biogenesis is involved in the pathology of CDDP cytotoxicity of HEI-OC1 cells,and activation of peroxisome proliferator-activated receptor-g coactivator-1a can be considered a potential therapeutic strategy to attenuate CDDP-mediated ototoxicity.
