反义TR和p21双基因共表达对人主动脉平滑肌细胞增殖与凋亡的作用

目的观察携带反义凝血酶受体(ATR)或/和p21的单、双基因重组腺病毒伴随病毒(rAAV)载体对人主动脉平滑肌细胞(ASMC)增殖与凋亡的影响。方法以携带ATR或/和p21的单、双基因rAAV感染人ASMC。半定量RT-PCR检测各基因的整合与表达;MTT法测定感染不同时间点的细胞存活率;流式细胞术检测细胞周期与凋亡细胞数目的变化;吖啶橙/溴化乙锭(AO/EB)染色检测凋亡细胞的比率。结果单、双基因在ASMC中均获得整合,且双基因发生了共表达;病毒感染4d时,ATR组、p21组和AP双基因组的细胞存活率与对照组相比分别降低了16.7%、21.6%和29.4%;三组的G0/G1期细胞数分别为(61.8±2.9)%、(82.5±4.0)%和(80.4±6.1)%;凋亡细胞数为(4.8±0.5)%、(5.7±0.1)%和(9.2±0.9)%;AO/EB染色显示的凋亡细胞比率分别为:对照组(1.5±0.8)%、ATR组(7.2±3.3)%、p21组(10.7±5.6)%、AP组(18.3±2.7)%。结论(1)双基因共表达对抑制细胞增殖和诱导凋亡的作用均较单基因具有较强的生物学效应。(2)为再狭窄的基因治疗提示了更优化的途径。

p21^(WAF1/CIP1) Gene DNA Sequence Change and Their Relationship with the Phenotype of Human Osteosarcoma

Objective: To investigate the p21WAF1 /CIP1gene DNA sequence change and their relationship with the phenotype of human osteosarcoma. Methods: p21WAF1 /CIP1gene DNA of 36 osteosarcoma spec- imens was examined by using polymerase chain reaction-single strand conformation polymorphism (PCR- SSCP) method. The PCR products were sequenced directly. Results: In p21WAF1 /CIP1 gene exon3 of 36 cases of human osteosarcoma, the change of C→T in the p21WAF1 /CIP1gene CDNA sequence of position 609th occurred in 17 cases with the incidence being 44.4%. In 10 normal blood samples, DNA sequence analysis showed the change of C→T in the p21WAF1 /CIP1gene CDNA sequence of position 609th occurred in 8 cases with the incidence being 80%. Conclusion: The novel location of p21WAF1 /CIP1gene polymorphism of osteosarcoma, but not mutation was de?ned, and this location might provide the meaningful reference for the further research of p21WAF1/CIP1 gene.p2lWAF1/CIP1基因DNA序列分析及其与骨肉瘤表型的关系

上颌窦恶性肿瘤p21及nm23基因表达与复发转移的关系

目的探讨p21及nm23基因蛋白表达与上颌窦恶性肿瘤复发转移的关系。方法采用免疫组化S-P法对37例上颌窦恶性肿瘤组织的p21及nm23基因蛋白表达进行检测。所有患者均随访5年以上。结果上颌窦恶性肿瘤p21和nm23-H_1阳性表达均明显低于上颌窦良性肿瘤组织的表达,上颌窦恶性肿瘤中复发或转移组的p21及nm23-H_1阳性表达均明显低于无复发或转移者的表达,二者之间的差异有显著性。结论 p21基因与上颌窦恶性肿瘤浸润及复发转移有关,而nm23基因与复发转移有关。

胃癌组织p21基因表达及基因改变的研究

目的研究胃癌组织P21蛋白表达和p21基因改变的意义．方法32例胃癌石蜡标本，其中乳头状腺癌6例，管状腺癌9例，粘液腺癌8例，低分化腺癌7例，未分化癌2例，存在淋巴结转移的标本23例，32例癌旁正常胃粘膜组织作对照．应用ABC免疫组化方法检测P21蛋白表达，单链构象多态性分析（SSCP）检测p21基因改变．参照文献确定p21蛋白表达的阳性标准及SSCCP检测p21基因异常标准，并对结果进行统计学分析．结果胃癌组织P21蛋白表达阳性率56．3％（18／32），其中管状腺癌77．8％（7／9），乳头状腺癌83．3％（5／6），粘液腺癌37．5％（3／8），低分化腺癌42．9％（3／7），未分化癌0％（0／2），存在淋巴结转移组为43．5％（10／23），无淋巴结转移组为88．9％（8／9），癌旁组织为90．6％（29／32）．P21蛋白表达阳性率胃癌组织较癌旁组织明显降低（P＜0．05），与胃癌伴淋巴结转移呈负相关（P＜0．05），不同病理类型间未见差异显著（P＞0．05）．PCR－SSCR分析18．8％（6／32）胃癌组织存在p21基因改变．结论p21基因以异常表达及基因改变的方式参与胃癌发生、发展．

Inhibitory effect of tumor suppressor p33^(ING1b) and its synergy with p53 gene in hepatocellular carcinoma

AIM: To investigate the inhibitory effect of tumor suppressor p33ING1b and its synergy with p53 gene in hepatocellular carcinoma (HCC).METHODS: Recombinant sense and antisense p33ING1b plasmids were transfected into hepatoma cell line HepG2 with lipofectamine. Apoptosis, G0/G1 arrest, cell growth rate and cloning efficiency in soft agar of HepG2 were analyzed after transfection. In three hepatoma cell lineswith different endogenous p53 gene expressions, the synergistic effect of p33ING1b with p53 was analyzed by flow cytometry and luciferase assay was performed to detect the activation of p53 downstream gene p21WAF1/CIP1. In addition, the expression and mutation rates of p33ING1b in HCC tissues were measured by immunohistochemistry and polymerase chain reaction-single strand conformation polymorphism (PCR-SSCP).RESULTS: Overexpression of p33ING1b inhibited cell growth of HepG2, induced more apoptosis and protected cells from growth in soft agar. Combined transfer of p33ING1b and p53 gene promoted hepatoma cell apoptosis, G0/G1 arrest and elevated expression of p21WAF1/CIP1. Immunostaining results showed co-localized P33ING1b with P53 protein in HCC tissues and there was a significant relation between protein expression rates of these two genes (P＜0.01).Among 28 HCC samples, p33ING1b presented a low gene mutation rate (7.1%).CONCLUSION: p33ING1b collaborates with p53 in cell growth inhibition, cell cycle arrest and apoptosis in HCC. Loss or inactivation of p33ING1b normal function may be an important mechanism for the development of HCC retaining wildtype p53.

组蛋白去乙酰化酶抑制剂Apicidin/SAHA体外抑制人卵巢浆液性囊腺癌细胞的实验研究

目的:卵巢恶性肿瘤是妇科三大恶性肿瘤之一,其死亡率居妇科恶性肿瘤第一位。目前手术是治疗卵巢恶性肿瘤的主要方法,且术后常辅以紫杉醇和铂类为主的化疗,但化疗常常由于肿瘤细胞发生耐药而导致化疗失败。因此对于卵巢癌的治疗迫切需要寻找新的突破。方法:是对体外培养人卵巢浆液性囊腺癌上皮细胞,取对数生长期细胞接种于96孔细胞培养板上,每组设6个复孔。采用全定量PCR方法检测p21基因mRNA含量的表达。结果:体外实验证实组蛋白去乙酰化酶抑制剂(HDACIs)能够诱导肿瘤细胞周期阻滞于G0/G1期和/或G2/M期,从而抑制肿瘤细胞的增殖率,具有很强的临床应用价值。结论:本次实验探讨不同浓度下的组蛋白去乙酰化酶抑制剂Apicidin、SAHA在人卵巢浆液性囊腺癌细胞系的作用和机制,为巢浆液性癌的治疗提供新的思路。

Exogenous acid fibroblast growth factor inhibits ischemia-reperfusion-induced damage in intestinal epithelium via regulating P53 and P21WAF-1 expression

AIM： To detect the effect of acid fibroblast growth factor （aFGF） on P53 and P21WAF-1 expression in rat intestine after ischemia-reperfusion （I-R） injury in order to explore the protective mechanisms of aFGF. METHODS： Hale rats were randomly divided into four groups, namely intestinal ischemia-reperfusion group （R）, aFGF treatment group （A）, intestinal ischemia group （I）, and sham-operated control group （C）. In group I, the animals were killed after 45 min of superior mesenteric artery （SHA） occlusion. In groups R and A, the rats sustained for 45 min of SHA occlusion and were treated with normal saline （0.15 mL） and aFGF （20 μg/kg, 0.15 mL）, then sustained at various times for up to 48 h after reperfusion. In group C, SHA was separated, but without occlusion. Apoptosis in intestinal villi was determined with terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick-end labeling technique （TUNEL）. Intestinal tissue samples were taken not only for RT- PCR to detect P53 and P21WAF-1 gene expression, but also for immunohistochemical analysis to detect P53 and P21WAF-1 protein expression and distribution. RESULTS： In histopathological study, ameliorated intestinal structures were observed at 2, 6, and 12 h after reperfusion in A group compared to R group. The apoptotic rates were （41.17±3.49）%, （42.83±5.23）%, and （53.33±6.92）% at 2, 6, and 12 h after reperfusion, respectively in A group, which were apparently lower than those in R group at their matched time points （50.67±6.95）%, （54.17±7.86）%, and （64.33±6.47）%, respectively, （P〈0.05））. The protein contents of P53 and P21WAF-1 were both significantly decreased in A group compared to R group （P〈0.05） at 2-12 h after reperfusion, while the mRNA levels of P53 and P21VVAF-1 in A group were obviously lower than those in R group at 6-12 h after reperfusion （P〈0.05）. CONCLUSION： P53 and P21WAF-1 protein accumulations are associated with intestinal barrier injury induced by I-R insult, while intravenous aFGF can alleviate apoptosis of rat intestinal cells by inhibiting P53 and P21WAF-1 protein expression.