TIMP-1对肝癌细胞BEL-7402的增殖抑制

构建含人组织金属蛋白酶抑制TIMP1基因的表达载体，以磷酸钙沉淀法转染人肝癌细胞系^1BEL－7402，研究过表达TIMP1对肝癌细胞生长的影响，本研究首先从正常流产胎儿组织中提取总RNA，通过RT－PCR扩增获得TIMP1基因，并克隆到pcDNA6表达载体中，经酶切鉴定，序列测定结果正确后，转染入肝癌细胞系BEL－7402，采用MTT（四甲偶氮唑盐微量酶反应比色法）、细胞生长曲线等方法，经数据统计分析发现：TIMP1过表达能够抑制肝癌细胞BEL－7402的增殖。     

168例甲状腺癌病理活检回顾性分析

为总结甲状腺癌病理活检诊断体会，回顾性统计分析168例甲状腺癌病理活检材料，结果显示，患者男：女为1：3，女性明显多于男性．乳头状腺癌居首位(66．26％)，其次为滤泡癌(23．93％)，髓样癌占第三位(5．52％)，未分化癌最少见(4．29％)．通过对甲状腺癌各分型原诊断重新评价，认为对甲状腺癌存在过度诊断，亦存在误诊和漏诊．     

High frequency of p53 intronic point mutations in laryngeal squamous cell carcinoma

Intronic point mutations are rare and totally unknown for human laryngeal squamous cell carcinoma (LSCC). To explore the relationship of p53 gene intronic mutation to the development of human LSCC, DNA was extracted from both tumor tissues and matched normal tissues of 55 patients with LSCC in northeast of China. Polymerase chain reaction amplification-single strand conformational polymorphism (PCR-SSCP) combined with silver staining and DNA direct sequencing were used to detect mutations in exons 7～8 (p53E7 and p53E8) and introns 7～8 (p53I7 and p53I8) of p53 gene. The p53E7 mutation was detected in 17 out of 55 patients, and the p53I7 mutation in 21 patients. No mutation was found at p53E8 or p53I8 site. The difference between tumor group and paired normal group on the rates of both p53E7 and p53I7 mutations was statistically significant. The rate of p53I7 mutations in tumor tissue was higher than that of normal tissue, and so was that of p53E7. Sequence analysis revealed that most p53I7 mutations were at the nucleotides in the branch point sequence or the polypyrimidine tract in the 3′-splice acceptor site of the intron 7. The high incidence of p53 gene intronic mutation in LSCC indicates that genetic changes within the noncoding region of the p53 gene may serve as an alternative mechanism of activating the pathogenesis of human laryngeal squamous cell carcinoma. Mutations in the noncoding region of this gene should be further studied.     

抗人肝癌单克隆抗体JHⅢ的制备及其生物学特性

用肝癌细胞株ＢＥＬ－７４０２脾内直接免疫ＢＡＬＢ／Ｃ小鼠，取其脾细胞与小鼠骨髓瘤细胞ＳＰ２／０融合，获得一株分泌肝癌单抗的杂交瘤细胞株ＪＨⅢ，其染色体众数为９０－１１０，单抗ＪＨⅢ系ＩｇＧ２ｂ亚类。杂交瘤细胞培养上清和腹水的效价分别为１：１０＾２～１０＾３和１：１０＾６以上。ＡＢＣ法证实它对肝癌组织有较好的相关性。ＩＦＡ法也证明它对肝癌细胞ＢＥＬ－７４０２有强的阳性反应，而对其他肿瘤细胞株和肿瘤组     

人体胃癌DNA转化细胞诱发裸鼠肿瘤的研究

从人体胃癌组织及胃腺癌细胞株SGC7901中分别提取DNA,用来转化NIH3T3小鼠细胞。第二轮转化细胞接种裸鼠体内后产生了肿瘤。就致瘤能力和诱发癌基因的表达水平而言,来源于胃腺癌细胞株DNA的转化细胞均低于来源于胃癌组织DNA的转化细胞及其诱发的肿瘤。人体胃癌细胞在裸鼠体内长成的肿瘤细胞,染色体数目减少,转化细胞引起的肿瘤,染色体数目无明显变化。     

应用PCR－SSCP银染技术检测消化系统肿瘤的P53基因突变

应用ＰＣＲ－ＳＳＣＰ银染技术，初步研究了肝细胞癌、胃癌和大肠癌中Ｐ５３基因的第６和第７外显子的分子结构改变。对来自癌组织ＤＮＡ和正常组织ＤＮＡ的ＰＣＲ－ＳＳＣＰ电泳带迁移作对比分析，发现３０例肝癌病人中，６例肝癌样品电泳带迁移异常；２６例胃癌病人中，４例胃癌样品电泳带迁移异常；２９例大肠癌病人中，６例大肠癌样品电泳带迁移异常。依据ＤＮＡ单链构象与分子电泳迁移的关系，研究结果表明：该三组病人中，Ｐ５３基因第６、７外显子的突变率分别为２０．０％，１５．４％和２５．０％。同时，也间接提示了Ｐ５３基因突变可能是肝细胞癌、胃癌和大肠癌中一种较多见的分子结构改变。     

犬猫乳腺癌的病理学观察

7例犬猫乳腺肿瘤被分别诊断为乳腺硬化性腺癌、髓样癌、乳头状腺癌、管状腺癌,并对犬猫乳腺肿瘤、乳腺癌的发生、预防、形态及诊断进行了讨论.     

Inhibition of PKB/Akt activity involved in apigenininduced apoptosis in human gastric carcinoma cells

Apigenin is a flavonoid widely distributed in fruits and vegetables. It possesses growth inhibitory properties against numerous cancer cell lines. However,the molecular mechanism(s) by which api-genin elicits its effects have not been fully elucidated. Here we studied whether apigenin inhibits growth and induces apoptosis in human gastric carcinoma cells. We showed that the flavonoid inhibited growth of the cells and caused apoptosis,as evidenced by DNA Ladder,cleavage of pro-caspase-3 in a time-dependent manner. Induction of apoptosis was dependent on inhibition of the PKB/Akt activity. We found that while apigenin had no effect on the expression of Akt and Bad,it inhibited specific phosphorylation of the two proteins that are associated with pro-survival mechanisms. We propose that this important flavonoid induces apoptosis in gastric cancer cells by inhibiting Akt activity. Since Akt is often activated in cancers,our findings may have clinical implications.     

壮药“国虾薄”（绞股蓝）碱水解产物对A549细胞的抑制活性

本文比较了绞股蓝（Gynostemma pentaphyllum）碱水解前后的正丁醇提取物对肺癌A549细胞的抑制活性.方法：绞股蓝叶用12倍量的80％乙醇超声提取3h,正丁醇萃取,90 ℃碱水解反应6h,利用HPLC分析方法,分析了绞股蓝碱水解前后的正丁醇提取物中色谱峰的变化,并对它们进行肺癌A549细胞的抑制活性检测.结果发现碱水解使绞股蓝中的成分有转化,而且绞股蓝的碱水解产物对肺癌A549细胞的抑制活性显著增强.从而证实,碱水解可使绞股蓝成分发生转化,并且增强了对肺癌A549细胞的抑制活性,为绞股蓝有效成分的转化提供实验依据.     

甲状腺乳头状癌中央区食道旁淋巴结清扫的临床意义

目的探讨中央区淋巴结清扫在甲状腺乳头状癌治疗中的临床意义.方法选取128例甲状腺乳头状癌行同侧中央区淋巴结清扫的患者作为观察对象,按照手术方式将其分为健康观察组(65例,行单侧或双侧甲状腺腺叶+峡部切除+中央区淋巴结清扫术)与对照组(63例,行单侧或双侧甲状腺腺叶+峡部切除术),随访2 a,对比两组患者的中央区食道旁淋巴结转移、外侧区淋巴结转移、复发及并发症情况.结果 1)随访期间,两组均未出现死亡病例;观察组随访期内发生中央区淋巴结转移5例,转移率为7.69%;颈侧区淋巴结转移3例,转移率为4.62%;对照组随访期内发生中央区淋巴结转移11例,转移率为17.46%;颈侧区淋巴结转移7例,转移率为11.11%;对照组明显高于观察组,两组比较具有统计学意义(P0.05).2)观察组术后并发症发生率为13.85%,对照组术后并发症发生率为15.38%,两组之间比较无统计学意义(P0.05).结论甲状腺乳头状癌的中央区淋巴结转移率较高,行中央区食道旁淋巴结清扫治疗术后复发率与并发症发生均较低,值得在临床中推广应用.