PTEN、BCL-2和C-erbB-2蛋白在子宫内膜癌的表达及临床意义

目的探讨检测PTEN、BCL-2和C-erbB-2蛋白在子宫内膜癌中表达的临床意义。方法采用免疫组化S-P法,分别检测20例正常子宫内膜组织、20例子宫内膜癌前病变、50例术后子宫内膜癌组织标本中PTEN、BCL-2和C-erbB-2蛋白的表达情况。结果 (1)子宫内膜癌组织与子宫内膜癌前病变、正常子宫内膜组织比较,PTEN、BCL-2蛋白阳性表达率明显降低,差异有显著性,C-erbB-2蛋白阳性表达率明显增加,差异有显著性。(2)PTEN蛋白与BCL-2蛋白的表达与组织学分级及临床分期均有关,且随着组织学分级和临床分期的升高,PTEN蛋白及BCL-2蛋白的阳性表达均显著降低;与有无淋巴结转移均无关。(3)C-erbB-2蛋白的表达与临床分期有关,随着临床分期的增加,C-erbB-2蛋白的阳性表达显著升高;与组织学分级及淋巴结转移无显著相关。(4)在子宫内膜癌中,PTEN与BCL-2蛋白的表达呈正相关,而PTEN与C-erbB-2蛋白的表达呈负相关,BCL-2与C-erbB-2蛋白的表达呈负相关。结论 PTEN、BCL-2蛋白失表达和C-erbB-2蛋白过表达在子宫内膜癌的发生、发展中发挥着一定的作用,三者的联合检测可能有助于子宫内膜癌的早期诊断、预后评估。

PTEN和Bcl-2基因在骨肉瘤组织中的表达及意义

目的:探讨PTEN,B cl-2基因在骨肉瘤组织中表达的意义和和临床价值。方法:用SP免疫组化方法检测PTEN和B cl-2在62例骨肉瘤及20例骨软骨瘤表达情况结果PTEN的阳性表达率在骨肉瘤中为58.1%(36/62),在骨软骨瘤中为85%(17/20),两者差异显著(P<0.05);B cl-2的阳性表达率在骨肉瘤中为51.6%(32/62),在骨软骨瘤中为20%(4/20),两者差异显著(P<0.05)。PTEN的低表达与分化程度无关与肺转移有关,B cl-2的高表达与分化程度有关。术后生存5年以上者的PTEN蛋白阳性率(66.7%)较生存时间不超过5年者(28.1%)高(P<0.05)。骨肉瘤组织中B cl-2与PTEN基因的表达未见显著性相关(P>0.05)。结论:骨肉瘤中存在PTEN呈低表达而B cl-2高表达,PTEN低表达和B cl-2高表达于骨肉瘤侵袭、转移有关。

PTEN、bcl-2及bax基因在非小细胞肺癌中的表达及意义

①目的 探讨非小细胞肺癌PTEN、Bcl 2及Bax蛋白表达与临床病理特征的关系。②方法 采用SABC免疫组化法检测 4 3例非小细胞肺癌及 2 0例癌旁肺组织石蜡包埋标本PTEN、Bcl 2及Bax蛋白表达。③结果 肺癌PTEN、Bax表达阳性率显著低于癌旁肺组织 ,而Bcl 2蛋白表达显著高于癌旁肺组织 (χ2 =4 .74～ 1 3.6 1 ,P <0 .0 5、0 .0 1 )。PTEN蛋白表达与分化程度、有无淋巴结转移和预后有关 (χ2 =5 .31～ 8.5 0 ,P <0 .0 5、0 .0 1 ) ;Bcl 2蛋白表达与分期有关 (χ2 =5 .31 ,P <0 .0 5 ) ;Bax蛋白表达与分化程度和预后有关 (χ2 =5 .32、4 .86 ,P <0 .0 5 )。肺癌Bcl 2与Bax蛋白表达呈负相关 (χ2 =7.2 0 ,P <0 .0 1 ) ,PTEN与Bax、Bcl 2之间未见明显相关性 (χ2 =1 .1 7、1 .4 2 ,P >0 .0 5 )。④结论 肺癌组织中PTEN、Bax蛋白的低表达和Bcl 2蛋白的高表达在肺癌发生中可能起重要作用。对 3种蛋白进行联合检测 ,更有利于肺癌的早期诊断和判断肺癌的分化程度、临床分期、淋巴结是否转移及病人的预后。

红花多糖对荷瘤鼠Ang-2、PTEN蛋白表达的影响

目的:研究红花多糖(SPS)对荷瘤鼠的移植瘤组织中Ang-2、PTEN蛋白表达的影响及意义。方法:选择昆明种小鼠80只制备荷瘤小鼠,随机分为4组,每组20只。对照组:模型组;实验组:环磷酰胺药物组、红花多糖+环磷酰胺药物联合组、受试药物红花多糖组。用药方法:(1)模型对照组给荷瘤鼠灌服生理盐水;(2)环磷酰胺药物组灌服环磷酰胺;(3)红花多糖+环磷酰胺药物联合组灌服环磷酰胺和红花多糖;(4)红花多糖组:红花多糖灌服荷瘤鼠。给药10天后停药,取肿瘤组织,称取湿重,计算抑瘤率。然后用S-P免疫组织化学法测定对照组、实验组荷瘤鼠移植瘤组织中Ang-2、PTEN蛋白的表达情况。结果:荷瘤鼠灌服生理盐水的模型对照组移植瘤组织中Ang-2的免疫组化阳性表达率显著高于各实验组(P<0.05),而PTEN蛋白的阳性表达率显著低于各实验组(P<0.01)。红花多糖、环磷酰胺联合用药组的抑瘤率最高,其次为环磷酰组、红花多糖组。结论:红花多糖具有抑制肿瘤组织生长的作用,可降低肿瘤组织中Ang-2的表达,从而增强PTEN蛋白的表达。

PTEN、HER-2/neu和PKB在胆管癌组织中的表达及其意义

目的:观察PTEN、HER-2/neu和PKB在胆管癌组织中的表达,并探讨其与胆管癌发生、发展的关系及其意义.方法:应用免疫组织化学SP法检测80例胆管癌组织和24例正常胆管组织(取自其他良性疾病行胆管切除者)中PTEN、HER-2/neu和PKB的表达.结果:胆管癌组织中PTEN表达显著低于正常胆管组织(40.00%vs79.17%,χ2=11.33,P=0.001),HER-2/neu的表达显著高于正常胆管组织(73.75%vs33.33%,χ2=13.16,P=0.000),PKB的表达显著高于正常胆管组织(80.00%vs54.17%,χ2=6.41,P=0.01).PTEN和HER-2/neu蛋白表达呈明显负相关(r=-0.456,P=0.000);PTEN与PKB蛋白表达呈明显负相关(r=-0.355,P=0.001);HER-2/neu与PKB蛋白表达呈明显正相关(r=0.374,P=0.001).结论:PTEN表达的缺失和HER-2/neu过表达可能导致细胞增殖失控,与胆管癌的发生、发展密切相关,二者均与PKB呈相关性,提示二者均可能通过PI3K-PKB信号转导参与胆管癌的发生发展.

THE EXPRESSION AND CLINICAL VALUE OF APOPTOSIS CONTROL GENE Bcl-2 AND Bax IN BREAST CANCER

Objective: To study the expression and clinical value of apoptosis control gene bcl-2 and bax in breast cancer. Methods: Protein bax and bcl-2 in 41 breast cancers obtained from operations in our hospital in 1996 were detected using ABC immunohistochemical stain assay and compared with 10 cases with normal breast tissues. Results: The positive rate of bax in normal breast tissue was 90% and in breast cancer was 59%, with a significant statistical difference between them (P<0.05), but there was no statistical difference in bcl-2 protein expression. Among the 41 breast cancer, the group with lymph node metastasis (21 cases) had obviously low bax expression (43%) and high bcl-2 expression (76%), showing significant difference to the group without lymph node metastasis (P<0.05). Conclusion: The antiapoptosis function of bcl-2 was stronger than bax in breast cancer. Protein bax and bcl-2 assay may be useful in understanding the biological behaviors of breast cancer.

THE OVEREXPRESSION OF APOPTOSIS-RELATED GENES OF P_53 AND BCL-2 IN CERVICAL CARCINOMA

Objective To investigate the significance of overexpression of p5s and bcl-2 protein in carcinogene- sis of cervix. Methods 10 cases of cervical intraepithelial neoplasis(CIN) and 57 cases of invasive cancer were in- vestigated with immunohistochemistry technique. Results The overexpresion or P53 protein ir CIN and cervical can- cer was significantly higher than that or control, respectively (P<0.01). But there was no significant difference be- tween CIN and cervical cancer(P>0.05). The immunoreactivity of bcl-2 in CIN was much more higher than that of control (P<0.05). The positive rate and immunoreactivity of bcl-2 in cervical carcinoma were both remarkably high- er than those of control (P<0.0l),but there was no significant difference between CIN and cervical carcinoma (P> 0.05). It was also found that there was a remarkably positive correlation between the overexpression of bcl-2 and P53 (P<0.01). Conclusion Because of the loss of wtP53 function,the expression of bcl-2 can not be down-reguated, which is associated with the pathogenesis and development of cervical carcinoma.

PTEN和C-erbB-2蛋白在子宫内膜癌的表达及临床意义

目的探讨PTEN和C-erbB-2蛋白在子宫内膜癌中表达的临床意义。方法采用免疫组化S-P法,分别在20例正常子宫内膜组织、20例子宫内膜不典型增生过长,50例术后子宫内膜癌组织标本中检测PTEN和C-erbB-2蛋白的表达情况。结果 (1)子宫内膜癌组织与子宫内膜不典型增生过长、正常子宫内膜组织比较,PTEN蛋白阳性率明显降低,有显著性差异。C-erbB-2蛋白阳性率明显增加,有显著性差异。(2)PTEN蛋白的表达与组织学分级、临床分级及临床分期都有关,而且随着组织学分级和临床分期的升高,PTEN的阳性表达出现显著降低,和有无淋巴结转移无关。(3)C-erbB-2蛋白的表达与临床分期有关,随着临床分期的增加,C-erbB-2蛋白的阳性表达显著升高,与组织学分级及淋巴结转移无显著相关。(4)在子宫内膜癌中PTEN与C-erbB-2蛋白的表达呈负相关。结论 PTEN蛋白失表达和C-erbB-2蛋白过表达在子宫内膜癌的发生、发展中发挥着一定的作用,两者的联合检测可能有助于子宫内膜癌的早期诊断,为预后评估提供帮助。

Alanyl-glutamine dipeptide inhibits hepatic ischemiareperfusion injury in rats

AIM： To investigate the protective effect and mechanism of alanyl-glutamine dipeptide （Ala-GIn） against hepatic ischemia-reperfusion injury in rats. METHODS： Rats were divided into group C as normal control Group （/7=16） and group G as alanyl-glutamine pretreatment 07=16）. Rats were intravenously infused with 0.9% saline solution in group C and Ala-GIn -enriched （2% glutamine） 0.9% saline solution in group G via central venous catheter for three days. Then all rats underwent hepatic warm ischemia for 30 min followed by different periods of reperfusion. Changes in biochemical parameters, the content of glutathione （GSH） and the activity of superoxide dismutase （SOD） in liver tissue, Bcl-2 and Bax protein expression and morphological changes of liver tissue were compared between both groups. RESULTS： One hour after reperfusion, the levels of liver enzymes in group G were significantly lower than those in group C （P〈0.05）. Twenty-four hours after reperfusion, the levels of liver enzymes in both groups were markedly recovered and the levels of liver enzyme in group G were also significantly lower than those in group C （P〈0.01）. One and 24 h after reperfusion, GSH content in group G was significantly higher than that in group C （P 〈0.05）. There was no statistical difference in activities of SOD between the two groups. One and 24 h after reperfusion, the positive expression rate of Bcl-2 protein was higher in group G than in group C （P〈0.05） and the positive expression rate of Bax protein was lower in group G than in group C （P〈0.05）. Histological and ultrastructural changes of liver tissue were inhibited in group C compared to group G. CONCLUSION： Our results suggest that Ala-GIn pretreatment provides the rat liver with significant tolerance to warm ischemia-reperfusion injury, which may be mediated partially by enhancing GSH content and regulating the expression of Bcl-2 and Bax proteins in the liver tissue.

Effect of compound Guizhu capsule on phosphate and tension homology deleted on chromsome ten and murine double mimute 2 gene expression in lung cancer of mice

OBJECTIVE: To observe the inhibitory effect of the Chinese herbal compound Guizhu capsule(CGZC)on lung cancer and explore the possible mechanism underlying its actions by evaluating its effects on the expression of phosphate and tension homology deleted on chromsome ten(PTEN) and murine double mimute 2(MDM2) in lung cancer model mice.METHODS: A mouse model of transplanted lung cancer was established by subcutaneous inoculation of cancer cells into the axillae of mice. Twenty-four hours later, the mice were weighed and randomly divided into the model control group, cisplatin group(DDP group), and high, moderate and low dosage CGZC groups, with ten mice in each group. The control mice received an equal volume of distilled water. DDP was intraperitoneally injected at 1 mg/kg in the DDP group, once a day for 3days. CGZC diluted with distilled water was admin-istered at 20 g/kg(10 times the clinical adult dosage) in the high-dose group, 10 g/kg(5 times the clinical adult dosage) in the moderate-dose group and 5 g/kg(2.5 times the clinical adult dosage) in the low-dose group once a day for 10 days. On the11 th day, the mice were weighed and killed. The tumor tissues were weighed and the tumor inhibition rate was calculated. PTEN and MDM2 protein expression were detected by immunohistochemical analysis of tumor tissues.RESULTS: The CGZC high-and moderate-dose groups showed a significant inhibitory effect on tumor growth(P < 0.05); there was no significant difference between the high dose group and the DDP group(P > 0.05). The CGZC high-dose group also showed enhanced expression of PTEN protein(P <0.01) and decreased expression of MDM2 protein(P < 0.01) in lung cancer cells of the mice. There was no significant difference between the high dose group and the DDP group.CONCLUSION: CGZC has a significant inhibitory effect on transplanted lung cancer in mice. The mechanism may involve reducing expression of PTEN and decreasing the expression of MDM2 in the lung cancer tissues of the mice.