修回日期: 2004-03-25
接受日期: 2004-04-05
在线出版日期: 2004-08-15
目的: 探讨TGIF(TG interacting factor)蛋白在食管癌中的表达水平及其临床病理意义.
方法: 应用免疫组织化学SP法, 对32例食管癌的活检和手术切除标本进行抗人TGIF抗体免疫组织化学染色, 检测癌组织和癌旁组织TGIF的表达, 并分析TGIF的表达与食管癌临床病理特征之间的关系.
结果: TGIF在食管黏膜鳞状上皮和食管癌组织中阳性率分别为60.0%和71.2%, 但后者以中度-强阳性为主. TGIF蛋白在食管癌组织中的表达水平明显高于正常食管黏膜鳞状上皮(P = 0.036), 但与性别、肿瘤的分化、浸润深度及淋巴结的转移无关.
结论: TGIF通过抑制TGF-β和视黄醛促进食管癌的发生与发展.
引文著录: 胡忠良, 文继舫, 郑晖, 傅春燕. 食管癌组织TGIF表达的意义. 世界华人消化杂志 2004; 12(8): 1766-1768
Revised: March 25, 2004
Accepted: April 5, 2004
Published online: August 15, 2004
AIM: To investigate the expression level of TG interacting factor (TGIF) in esophageal carcinomas, and the correlation between TGIF and clinicopathological features of esophageal carcinoma.
METHODS: A total of 32 specimens of esophageal carcinoma were investigated by immunohistochemical staining with a polyclonal antibody against TGIF. The expression of TGIF in esophageal carcinoma was detected and the relationship between the expression of TGIF and clinico-pathological features of esophageal carcinoma was analyzed.
RESULTS: The positive rates of TGIF in normal esophageal squamous epithelium and esophageal carcinoma were 60% and 71.2%, respectively, but the latter had stronger intensity staining. The expression level of TGIF in esophageal carcinoma was higher than that in normal esophageal squamous epithelium (P = 0.036), but had no correlation with gender, depth of invasion, tumor grade and lymph node metastasis.
CONCLUSION: TGIF is a possible oncogene, and it may promote the progression of esophageal carcinomas via inhibiting both the TGF-β and retinoid signaling pathways.
- Citation: Hu ZL, Wen JF, Zhen H, Fu CY. Expression of TGIF in esophageal carcinoma and its clinicopathological features. Shijie Huaren Xiaohua Zazhi 2004; 12(8): 1766-1768
- URL: https://www.wjgnet.com/1009-3079/full/v12/i8/1766.htm
- DOI: https://dx.doi.org/10.11569/wcjd.v12.i8.1766
食管癌是一种严重威胁我国人民生命健康的常见肿瘤, 但其确切的发病机制尚不清楚[1-4]. 许多肿瘤的发生与TGF-β相关, 多数肿瘤丧失了TGF-β介导的生长抑制作用[5]. TGIF(TG-interacting factor, TGIF)能通过多种方式抑制TGF-β信号通路[6-9]. MAPK通路可磷酸化TGIF使其半衰期延长, 从而引起TGIF蛋白浓度升高[7]. TGIF功能的增强可能抑制TGF-β对细胞的负性调节作用. 为探讨TGIF在肿瘤发生中的作用, 我们应用免疫组织化学方法, 分析TGIF蛋白在食管癌中的表达水平及其临床病理意义.
中南大学湘雅医院病理科2000-2001年食管癌石蜡包埋组织32例. 男29例, 女4例, 年龄37-75岁(平均59±9岁); 高分化12例, 中分化13例, 低分化7例. 所有标本经40 g/L甲醛固定, 常规石蜡包埋, 临床资料和病理诊断准确无误. 并分别选用20例食管癌的远断端(距肿块边缘均在5 cm以上)作为对照组. 全部蜡块均切成4 μm厚, 60 ℃干烤4 h, 进行免疫组织化学染色. 多克隆性抗TGIF抗体(羊)sc-9826为Santa Cruz Biotechnology, Inc. 产品, 工作浓度为1: 100; SP-Streptavidin Peroxidase kit购自北京中山生物技术有限公司.
辣根过氧化酶标记的SP 法. 即: 石蜡切片常规脱蜡至水, 30 mL/L 过氧化氢-甲醇封闭5 min, PBS(pH7.2)漂洗后置EDTA中, 微波炉抗原修复10 min, PBS 漂洗后依次滴加一抗37 ℃ 30 min并 4 ℃过夜, 二抗37 ℃ 30 min, 辣根酶标记的链霉卵白素工作液30 min 及显色底物, 于显微镜监视下显色, 自来水充分冲洗终止反应, 苏木素复染, 脱水, 透明, 封片(以PBS 代替一抗为阴性对照). TGIF阳性表达以细胞质或细胞核出现明显的棕黄色颗粒为准. 免疫组织化学染色阳性细胞分4级: 无棕黄色颗粒(-); 轻度棕黄色颗粒(+); 中度棕黄色颗粒(++); 重度棕黄色颗粒(+++).
统计学处理 等级资料的秩和检验(Krukal Wallis'of Nemenyis'), 检验水准: α = 0.05.
TGIF蛋白的表达主要定位于胞质, 多位于核周, 部分为核阳性. 他在部分食管黏膜鳞状上皮中表达(图1), 阳性率60%, 但多为轻度阳性. 食管癌组织TGIF蛋白的阳性率为71.2%, 阳性程度以中度-强阳性为主. 统计学分析表明TGIF蛋白在食管癌组织中的表达水平明显高于正常食管黏膜鳞状上皮(图1)(P = 0.036), 但与性别、肿瘤的分化、浸润深度及淋巴结的转移无关(表1)(P>0.05).
TGIF基因定位于18p11, 属于同型结构域TALE家族. 他参与多种生物的发育过程, TGIF的基因突变致功能失活后, 能引起人前脑无裂畸形[10]. TGIF表达缺失型雄性果蝇尽管外观正常, 但丧失了生殖能力[11-12]. 此外, TGIF可抑制TGF-β和视黄醛等细胞信号通路, 而TGF-β和视黄醛能抑制上皮细胞生长, 诱导细胞的分化和凋亡. TGIF在肿瘤发生中的作用尚不明确, Voorter et al[13]通过比较基因组杂交发现在膀胱移行细胞癌中18p11存在基因扩增, 人类TGIF蛋白的过表达能使酵母细胞通过G1期细胞周期阻滞点[14], Luo et al[15]发现在卵巢癌患者的血清中存在针对TGIF的抗体. 我们的研究结果表明TGIF蛋白在食管癌组织中有过表达, Nakakuki et al[16]发现在食管癌细胞系中有TGIF基因的扩增, TGIF有可能通过抑制TGF-β和视黄醛这两条信号通路而促进食管癌的发生与发展, TGIF在食管癌中可能起癌基因的作用. 但TGIF的表达与性别、肿瘤的分化、浸润深度及淋巴结的转移无关.
TGIF为核蛋白, 但我们的研究却表明阳性信号主要定位于胞质, 散在分布于胞核, 这可能是由于TGIF蛋白的合成必须在胞质中进行, 胞质中积聚大量TGIF前体蛋白的缘故. 总之, TGIF在肿瘤发生中的作用有待进一步的研究.
编辑: N/A
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