过氧化物酶体增殖物激活受体β反义寡脱氧核苷酸促进肿瘤坏死因子α介导的HaCaT细胞凋亡的实验研究

目的观察过氧化物酶体增殖物激活受体(PPAR)β反义寡脱氧核苷酸(asODN)在肿瘤坏死因子(TNF)α介导的HaCa了细胞凋亡中的作用。方法常规复苏HaCaT细胞,随机分为正常对照组(不行转染)、对照组(单纯用脂质体处理)、错义寡脱氧核苷酸(scrODN)组(转染PPARβscrODN)、asODN组(转染PPARβasODN)、TNF-α组(受TNF-α刺激)、scrODN TNF-αC组(同scrODN组处理后受TNF-α(刺激)、asODN TNF-α组(同asODN组处理后受TNF-αC刺激),PPARβscrODN或asODN均为4μmol／L,TNF-α为10μg／L。采用逆转录聚合酶链反应和蛋白质印迹法观察PPARβmRNA及其蛋白质的表达水平;采用hoechst33258荧光染色,观察细胞的形态学改变并计算凋亡核百分率;采用噻唑蓝法测定存活细胞数;采用半胱氨酸天冬氨酸蛋白酶(caspases)比色测定试剂盒检测caspase-3的活化情况。结果正常对照组、对照组、scrODN组PPARβmRNA及其蛋白质的表达水平相近;asODN组则明显下降。正常对照组、scrODN组及asODN组凋亡核百分率低下,存活细胞数较多,caspase-3活性也处于低水平。TNF-α组、scrOON TNF-α组凋亡核百分率分别为(33．1±2．7)％、(32．9±3．0)％,存活细胞数较少,caspase-3活性较高;asODN TNF-α组凋亡核百分率增至(58．8±4.6)％,且存活细胞数、caspase-3活性分别明显低于和高于前2组(P<0．05)。结论PPARβasODN能促进TNF-α介导的HaCaT细胞凋亡。

Study on the antisense oligonucleotide against peroxisome proliferator-activated receptors promoting TNF-α mediated apoptosis of HaCat cells

OBJECTIVE: To investigate the influence of antisense phosphorothioate oligonucleotides on peroxisome proliferator-activated receptors (PPARbeta) in the TNF-alpha mediated apoptosis of HaCat cells. METHODS: HaCat cells were resuscitated and randomly divided into normal control (without transfection), sham (merely with liposome transfection), scrODN (with transfection of 4 micromol/L PPARbeta scrODN), asODN (with transfection of 4 micromol/L PPARbeta asODN), TNF-alpha with transfection of 10 micromol/L TNF-alpha), scrODN + TNF-alpha with 10 micromol/L TNF-alpha stimulation after transfection of 4 micromol/L PPARbeta scrODN), asODN + TNF-alpha with 10 micromol/L TNF-alpha stimulation after transfection of 4 micromol/L PPARbeta asODN) groups. The mRNA and protein levels of PPARbeta were determined with RT-PCR and Western blotting, respectivly. The changes in cell morphology were observed with Hoechst 33258 fluorescent staining to quantitate apoptotic rate of nuclei. The effect of PPARbeta asODN on HaCat cell viability was assayed with MTT method. Activation of caspase-3 was evaluated with caspase colorimetric analysis kit. RESULTS: The mRNA and protein expression of PPARbeta in normal control, sham, scrODN groups were similar, but it decreased obviously in asODN group. The nuclear apoptotic rate in normal control, scrODN and asODN groups were rather low, and the caspase-3 activity in these groups was also low. After 24 hours of culture, the nuclear apoptotic rate in TNF-alpha and scrODN + TNF-alpha groups were (33.1 +/- 2.7)% and (32.9 +/- 3.0)%, respectively, while that in asODN + TNF-alpha group was obviously increased (58.8 +/- 4.6)%, with the caspase-3 activity significantly higher, but the number of live cells markedly lower than that in the former 2 groups (P < 0.05). CONCLUSION: PPARbeta expression can promote the apoptosis of HaCat cells mediated by TNF-alpha.