NRF2与MRP2在原发性胆囊癌中的表达

目的 检测核因子E2 p45相关因子2(Nuclear factor-erythroid 2 p45-related factor 2,NRF2)与多药耐药相关蛋白2(multidrug resistance-associated protein 2,MRP2)在原发性胆囊癌组织中的表达,探讨其在胆囊癌发生、发展中的作用.方法 采用免疫组化SP法检测59例原发性胆囊癌组织中NRF2和MRP2的蛋白表达水平.结果 原发胆囊癌组织中NRF2和MRP2表达的强阳性率分别为76.3%和74.6%.随着转移程度、Nevin分级以及病理分级的增加,NRF2和MRP2的强阳性表达率增加,且差异具有统计学意义(P＜0.05);两者的强阳性表达与年龄、性别等临床特征无相关性;NRF2和MRP2表达之间具有相关性(r=0.589,P＜0.05).结论 NRF2和MRP2在原发性胆囊癌组织存在高表达且具有相关性,在胆囊癌的发生、发展中发挥作用.

Abstract：

Objective To detect the expressions of Nuclear factor-erythroid 2 p45-related factor 2 (NRF2) and multidrug resistance-associated protein 2 (MRP2), and investigate their significance in primary gallbladder carcinoma. Methods Immunohistochemistry SP assay and image analysis were used to detect the expressions of NRF2 and MRP2 protein in 59 patients with primary gallbladder carcinoma. Results A highly positive expression rates of NRF2 and MRP2 were found (76.3% and 74. 6%, respectively) in primary gallbladder carcinoma. The expressions of NRF2 and MRP2 had a significantly correlation with metastases, Nevin staging, and differentiation (P＜0.05), but there was no statistical association with sex and age. The expression of NRF2 had a positive correlation with MRP2 (r=0. 589,P＜0.05). Conclusion Both NRF2 and MRP2 were overexpressed in primary gallbladder carcinoma and they may play a role in the development of primary gallbladder carcinoma.     

ABCG2蛋白在肝癌中表达的临床意义

Objective To investigate the expression and clinical significance of ABCG2 protein in hepato-cellular carcinoma (HCC). Methods Specimens of HCC were collected at The First Aifiliated Hospital of Sun Yat-sen University from January 2005 to December 2006. The expression of ABCG2 protein in 165 samples of HCC tissue, 25 samples of normal liver tissue and 40 samples of cirrhotic liver tissue was detected using immunohisto-chemistry. The correlation between the expression of ABCG2 protein and clinicopathological characters was then analyzed. Enumeration data, survival rate and the difference between groups were analyzed with a chi-square test, the Kaplan-Meier method and Log-rank test, respectively. Results ABCG2 protein expression was weakly posi-tive in all normal and cirrhotic liver tissues. In HCC tissues, the expression of ABCG2 protein was strongly positive in 66 cases and weakly positive in 99 cases. The expression of ABCG2 protein was related to tumor diameter, tumor number, adjacent organ invasion and TNM stages (χ2 =8. 130, 14. 279, 4. 820, 21. 179, P <0. 05). Kaplan-Meier survival analysis revealed that patients with strongly positive ABCG2 protein had a significantly lower 3-year overall survival (24. 1%) compared with those with weakly positive ABCG2 protein (39. 4%) (χ2 = 15.716, P<0.05). Conclusions The expression level of ABCG2 protein is related to tumor invasiveness, TNM stage and prognosis. ABCG2 has the potential to become a new target for HCC treatment.     

ABCG2蛋白在肝癌中表达的临床意义

Objective To investigate the expression and clinical significance of ABCG2 protein in hepato-cellular carcinoma (HCC). Methods Specimens of HCC were collected at The First Aifiliated Hospital of Sun Yat-sen University from January 2005 to December 2006. The expression of ABCG2 protein in 165 samples of HCC tissue, 25 samples of normal liver tissue and 40 samples of cirrhotic liver tissue was detected using immunohisto-chemistry. The correlation between the expression of ABCG2 protein and clinicopathological characters was then analyzed. Enumeration data, survival rate and the difference between groups were analyzed with a chi-square test, the Kaplan-Meier method and Log-rank test, respectively. Results ABCG2 protein expression was weakly posi-tive in all normal and cirrhotic liver tissues. In HCC tissues, the expression of ABCG2 protein was strongly positive in 66 cases and weakly positive in 99 cases. The expression of ABCG2 protein was related to tumor diameter, tumor number, adjacent organ invasion and TNM stages (χ2 =8. 130, 14. 279, 4. 820, 21. 179, P <0. 05). Kaplan-Meier survival analysis revealed that patients with strongly positive ABCG2 protein had a significantly lower 3-year overall survival (24. 1%) compared with those with weakly positive ABCG2 protein (39. 4%) (χ2 = 15.716, P<0.05). Conclusions The expression level of ABCG2 protein is related to tumor invasiveness, TNM stage and prognosis. ABCG2 has the potential to become a new target for HCC treatment.     

A new blood supply for human primary gallbladder carcinomas:vasculogenic mimicry,and its correlation with VEGF and significance

Objective To explore if vasculogenic mimicry (VM) exists in human primary gallbladder carcinomas and evaluate the correlation between the VM and expression of vascular epithelial growth factor (VEGF) in gallbladder carcinomas and its significance. MethodsSeventy-four carcinomas, 10 adenomas and 10 chronic inflammatory lesions of the gallbladder underwent operation and confirmed histopathologically were studied. Clinical-pathological data and survival of each patient with gallbladder carcinoma were recorded and followed-up. VM in human gallbladder carcinomas was observed under light microscope by HE staining, CD31 and PAS staining; the expression of VEGF proteins in each paraffin section of each patient in vivo was determined by Envision method of immunohistochemistry; the correlation among the VM, VEGF expression and their clinical significance in the patients with gallbladder carcinomas were analyzed and compared by Kaplan-Meier actuarial survival curves and Cox multiple factors. Results①13.5% (10/74) of human gallbladder carcinomas were found to contain VM, namely intratumoral, tumor cell-lined extracellular matrix (ECM)-rich, PAS-positive and vasculogenic-like network patterns. VM was associated with histological type (χ2=10.241,P=0.017), hepatic metastasis (χ2=4.238,P=0.042) and poor overall survival (χ2=5.722 1,P=0.016). ②Expression of VEGF was increased significantly in carcinomas with or without VM than adenomas and inflammatory lesions of the gallbladder (P0.000 1) in vivo; VEGF expression in the gallbladder carcinomas without VM was increased significantly than that with VM (P=0.018 2). ③There is positive correlation between expression of VEGF and the gallbladder carcinomas without VM in the cases of Nevin stage (P=0.003 5), invasion depth (P=0.005 9), liver metastases (P=0.037 3) and lymph node metastases (P=0.000 1), the same correlation was only observed between expression of VEGF and the gallbladder carcinomas with VM in the cases of liver metastases (P=0.032 3). When being compared the non-VM gallbladder carcinomas with the VM gallbladder carcinomas, expression of VEGF in the same conditions of Nevin stage (S3～S5, P=0.049 0) was higher significantly in the gallbladder carcinomas without VM than those with VM. ④The non-VM group underwent operation with positive expression of VEGF had longer 5-year survival than the VM group (P=0.007 2), furthermore, the non-VM group underwent operation with negative expression of VEGF had longer 5-year survival than the positive expression group (P=0.031). Also, VM, as invasive depth, lymph node metastasis, hepatic metastasis and operational method, is an independent, risk prognostic factor for patients with gallbladder carcinoma by Cox multiple factor analysis. ConclusionsVM, as a new blood supply for the growth of gallbladder carcinomas, is found to exist in the patients with gallbladder carcinomas. Increased expression of VEGF and its negative correlation with VM were observed in the gallbladder carcinomas. It is showed that VM is an independent risk prognostic factor in patients with gallbladder carcinoma, and VEGF is an important clinical marker for evaluation of Nevin stage, invasion depth, lymph node or liver metastases and prognosis in patients with gallbladder carcinoma; VM and VEGF are especially of important markers for estimating of prognosis in the gallbladder carcinoma patients.     

合并前列腺炎的前列腺增生组织中COX-2、VEGF的表达

Objectives To study the expressions of Vascular endothelial growth factor ( VEGF) and cyclooxygenase-2 in benign prostatic hyperplasia combined with Prostatitis,analyze their correlation and to investigate the effect and molecular mechanism of prostatitis on BPH.Methods 60 specimens were obtained from patients undergoing transurethral prostatic resection(TURP).The paraffin section of the specimens were stained with hematoxylin and eosin,and observed under light microscope to examine the inflammation pathological changes.Depending on whether the benign prostatic hyperplasia combined with prostatitis,those specimens were divided into group of simple benign prostatic hyperplasia ( A group) and group of benign prostatic hyperplasia combined with prostatitis ( B group),using inununohistochemistry and Real-time fluorescence quantitative PCR ( RT-PCR) to detect the expressions of COX-2 and VEGF in prostate tissues.Results (1) immunohistochemical staining: COX-2 and VEGF expressed in the A group and B group,but in the B group of tissues were significantly higher than A group of tissues( p <0.05); COX-2 and VEGF expression in the B group of organizations had a positive correlation ( R = 0.92,p <0.05) (2) COX-2 mRNA in the A group,the relative ratio; 0.141 ± 0.019,in the B group,the relative ratio: 0.161 ± 0.013;VEGF mRNA in the A group relative ratio: 0.2S4 ± 0.015,in the B group,the relative ratio; 0.341 ± 0.012,The expressions of COX-2mRNA and VEGF mRNA in the B group were significantly higher than the expressions of A group ( p <0.05) .Conclusions The inflammatory factor COX-2 and proliferative factor VEGF in the tissues of benign prostatic hyperplasia combined with prostatitis are significantly increased and the expression levels of both positive correlation,COX-2 by the way of up-regulating VEGF expression may be involved in the development process of benign prostatic hyperplasia.     

合并前列腺炎的前列腺增生组织中COX-2、VEGF的表达

Objectives To study the expressions of Vascular endothelial growth factor ( VEGF) and cyclooxygenase-2 in benign prostatic hyperplasia combined with Prostatitis,analyze their correlation and to investigate the effect and molecular mechanism of prostatitis on BPH.Methods 60 specimens were obtained from patients undergoing transurethral prostatic resection(TURP).The paraffin section of the specimens were stained with hematoxylin and eosin,and observed under light microscope to examine the inflammation pathological changes.Depending on whether the benign prostatic hyperplasia combined with prostatitis,those specimens were divided into group of simple benign prostatic hyperplasia ( A group) and group of benign prostatic hyperplasia combined with prostatitis ( B group),using inununohistochemistry and Real-time fluorescence quantitative PCR ( RT-PCR) to detect the expressions of COX-2 and VEGF in prostate tissues.Results (1) immunohistochemical staining: COX-2 and VEGF expressed in the A group and B group,but in the B group of tissues were significantly higher than A group of tissues( p <0.05); COX-2 and VEGF expression in the B group of organizations had a positive correlation ( R = 0.92,p <0.05) (2) COX-2 mRNA in the A group,the relative ratio; 0.141 ± 0.019,in the B group,the relative ratio: 0.161 ± 0.013;VEGF mRNA in the A group relative ratio: 0.2S4 ± 0.015,in the B group,the relative ratio; 0.341 ± 0.012,The expressions of COX-2mRNA and VEGF mRNA in the B group were significantly higher than the expressions of A group ( p <0.05) .Conclusions The inflammatory factor COX-2 and proliferative factor VEGF in the tissues of benign prostatic hyperplasia combined with prostatitis are significantly increased and the expression levels of both positive correlation,COX-2 by the way of up-regulating VEGF expression may be involved in the development process of benign prostatic hyperplasia.     

胰腺癌中磷酸酶和张力蛋白同源物基因及B7-H1蛋白的表达及其临床意义

Objective To investigate the probable correlation between the expressions of phosphatase and tensin homologue deleted on chromosometen (PTEN) and B7-H1 protein in pancreatic carcinoma and the biological behavior characteristics of tumors. Methods Forty-three patients were recruited who had undergone surgical resection for pancreatic carcinoma between 2002 and 2009. The PTEN and B7-H1 protein expressions in the tissue specimens of these 43 patients and 5 non-pancreatic carcinoma people' s pancreatic tissue specimens were evaluated by immunohistochemistry ELPS technique, and the clinical and pathological features of these specimens and the follow-up information were analyzed. Results PTEN expressions were significantly lower in pancreatic carcinoma tissues than in non-pancreatic carcinoma people' s pancreatic tissues but B7-H1 expressions were significantly higher ( P ＜ 0. 01 ). The expression of PTEN was negatively correlated to that of B7-H1 (r = -0.414 ,P ＜0. 01). PTEN and B7-H1 expressions correlated with the pathological grade and tumor-node-metastasis ( TNM ) stage, peripancreatic invasion, regional lymph node involvement,respectively (P＜0. 05). B7-H1 expressions also significantly correlated with the ages (P＜0. 01). Furthermore, PTEN and B7-H1 expressions showed significant prognostic effects (P＜0.01) and there are correlations existed between combined PTEN/B7-H1 expression and prognostic effects (P ＜0. 05). Conclusion The expression of PTEN and B7-H1 may be significantly correlated to the carcinogenesis,development and prognosis of pancreatic carcinoma.     

胰腺癌中磷酸酶和张力蛋白同源物基因及B7-H1蛋白的表达及其临床意义

Objective To investigate the probable correlation between the expressions of phosphatase and tensin homologue deleted on chromosometen (PTEN) and B7-H1 protein in pancreatic carcinoma and the biological behavior characteristics of tumors. Methods Forty-three patients were recruited who had undergone surgical resection for pancreatic carcinoma between 2002 and 2009. The PTEN and B7-H1 protein expressions in the tissue specimens of these 43 patients and 5 non-pancreatic carcinoma people' s pancreatic tissue specimens were evaluated by immunohistochemistry ELPS technique, and the clinical and pathological features of these specimens and the follow-up information were analyzed. Results PTEN expressions were significantly lower in pancreatic carcinoma tissues than in non-pancreatic carcinoma people' s pancreatic tissues but B7-H1 expressions were significantly higher ( P ＜ 0. 01 ). The expression of PTEN was negatively correlated to that of B7-H1 (r = -0.414 ,P ＜0. 01). PTEN and B7-H1 expressions correlated with the pathological grade and tumor-node-metastasis ( TNM ) stage, peripancreatic invasion, regional lymph node involvement,respectively (P＜0. 05). B7-H1 expressions also significantly correlated with the ages (P＜0. 01). Furthermore, PTEN and B7-H1 expressions showed significant prognostic effects (P＜0.01) and there are correlations existed between combined PTEN/B7-H1 expression and prognostic effects (P ＜0. 05). Conclusion The expression of PTEN and B7-H1 may be significantly correlated to the carcinogenesis,development and prognosis of pancreatic carcinoma.     

P2Y2 receptors and GRK2 are involved in oscillatory fluid flow induced ERK1/2 responses in chondrocytes

Mechanical loading is an important factor regulating cartilage metabolism maintained by chondrocytes. However, some of its underlying mechanisms remain poorly understood. In this study, we employed a chondrogenic cell line ATDC5 to investigate roles of P2Y₂ and GRK2 in chondrocyte mechanotransduction. We first confirmed the expression of chondrocyte markers in differentiated ATDC5 cells. We then exposed both differentiated and undifferentiated ATDC5 cells to oscillatory fluid flow, and found that differentiated ATDC5 cells responded to oscillatory fluid flow by increasing COX‐2 and aggrecan expressions. More importantly, fluid flow induced ERK1/2 response in differentiated cells was increased more than 10 times compared to those in undifferentiated cells. Furthermore, we found that P2Y₂ mRNA and protein levels in differentiated ATDC5 cells were significantly higher than those in undifferentiated cells. In contrast, GRK2 protein levels in differentiated cells were significantly lower than those in undifferentiated cells. Finally, overexpressions of P2Y₂ and GRK2 in differentiated ATDC5 cells result in a 34% increase and a 21% decrease of the ERK1/2 phosphorylation, respectively, in response to oscillatory fluid flow, suggesting important roles of P2Y₂ and GRK2 in chondrocyte mechanotransduction. © 2010 Orthopaedic Research Society Published by Wiley Periodicals, Inc. J Orthop Res 29:828–833     

SIRT2 Regulates LPS-Induced Renal Tubular CXCL2 and CCL2 Expression

Sirtuin 2 (SIRT2), a NAD⁺-dependent histone deacetylase, is involved in carcinogenesis and genomic instability and modulates proinflammatory immune responses. However, its role in renal inflammatory injury has not been demonstrated. In this study, we explored the expression patterns of CXCL2 and CCL2 in kidney tissue from Sirt2^−/− and Sirt2^+/+ mice and in mouse proximal tubular epithelial (MPT) cells. CXCL2 and CCL2 were significantly downregulated at both the mRNA and the protein levels in kidneys of LPS-treated Sirt2^−/− mice compared with those of LPS-treated Sirt2^+/+ mice. Furthermore, SIRT2 deficiency ameliorated LPS-induced infiltration of neutrophils and macrophages, acute tubular injury, and decrease of renal function. Supporting these observations, CXCL2 and CCL2 expression levels were lower in MPT cells treated with SIRT2-siRNA than in cells treated with control-siRNA, and adenovirus-mediated overexpression of SIRT2 in MPT cells significantly increased the LPS-induced expression of CXCL2 and CCL2 at the mRNA and protein levels. In addition, SIRT2 interacted with mitogen-activated protein kinase (MAPK) phosphatase-1 (MKP-1), and SIRT2-knockdown increased the acetylation of MKP-1 and suppressed the phosphorylation of p38 MAPK and c-Jun N-terminal kinase in LPS-treated MPT cells. SIRT2 also regulated p65 binding to the promoters of CXCL2 and CCL2. Taken together, these findings indicate that SIRT2 is associated with expression of renal CXCL2 and CCL2 and that regulation of SIRT2 might be an important therapeutic target for renal inflammatory injury.     

23 COX-2和 HER-2在结直肠癌中的表达及其意义

为研究COX 2和HER 2在结直肠癌中的表达及其临床意义以及两者的相互关系，笔者采用免疫组化法检测123例结直肠腺癌及其中的25例淋巴结转移灶组织、12例远癌肠黏膜组织、15例结直肠腺瘤性息肉组织COX 2和HER 2的表达情况。结果示，COX 2在远癌组织、腺瘤性息肉、腺癌中的高表达率分别为0%，33.3％，81.3％，三者差异有统计学意义（P<0.001）;腺癌中COX 2的高表达与Dukes分期、淋巴结转移和浸润层次有关;HER 2的高表达在腺癌（67.5％）与腺瘤性息肉（80.0%）之间差异无统计学意义，但均高于远癌肠黏膜（33.3%）（P<0.05）;HER 2的胞膜高表达与浸润层次有关;在淋巴结转移灶中COX 2和HER 2具有相关性(χ2=3.949，P<0.05，c=0.3693）。提示 COX 2在正常组织、腺瘤性息肉及腺癌中的表达逐步上调;COX 2可能是结直肠癌发生的早期事件;COX 2的高表达及HER 2胞膜的高表达均与肿瘤侵袭性增高有关。     

环氧合酶-2及血管生成素-2在大肠癌中的表达及临床意义

目的 研究环氧合酶-2（cyclooxygenase-2，Cox-2）及血管生成素-2（angiopoietin-2，Ang-2）在大肠癌组织、癌旁组织及正常大肠组织中的表达及其与大肠癌临床病理特征之间的关系。方法 采用免疫组化SP法检测45例大肠癌组织、45例癌旁组织及15例正常大肠组织中Cox-2和Ang2的表达情况。结果 大肠癌组织中的Cox-2和Ang-2的表达阳性率（80.0％，66.7％）均分别高于癌旁组织（35．6％，11．1％）及正常大肠组织（0，0），P均〈0.01。在大肠癌组织中Cox-2和Ang-2蛋白表达与淋巴结转移及Dukes分期有关（P〈0．05），且二者的表达具有相关性（P〈0．01）。结论 Cox-2和Ang-2在大肠癌发生、发展中起重要作用，二者在表达上密切相关。     

膀胱移行细胞癌中Dab2／DOC-2与GRB2表达的相关性及临床意义

目的探讨Dab2、GRB2在膀胱移行细胞癌中表达的临床意义及其相关性。方法应用免疫组织化学方法检测Dab2、GRB2在64例膀胱移行细胞癌中的表达,采用卡方检验分析两者表达与膀胱移行细胞癌临床病理学特征之间的关系。结果膀胱移行细胞癌中Dab2和GRB2阳性表达率分别是43．8％和81．3％,表达呈负相关（r=-0．383,P=0．002）。Dab2表达水平与肿瘤病理学分期有关,GRB2表达与肿瘤的病理学分级有关。结论Dab2、GRB2蛋白表达可作为判断膀胱移行细胞癌生物学行为的重要指标。     

PGE2和IL-2/IL-2R 在胃癌患者手术前后的动态变化和相互关系

目的　探讨胃癌患者外周血中白细胞介素２ （ＩＬ２）、白细胞介素２ 受体（ｓＩＬ２Ｒ） 水平及ＣＤ２５ 表达三者手术前后的动态变化情况和相互关系,以及前列腺素Ｅ２（ＰＧＥ２） 与ＩＬ２／ＩＬ２Ｒ系统的关系。方法　分别采用ＥＬＩＳＡ法、１２５ＩＲＩＡ法及免疫荧光法对５０ 例胃癌患者手术前后外周血中ＩＬ２、ｓＩＬ２Ｒ、ＰＧＥ２ 水平及ＣＤ２５ 表达进行检测。结果　胃癌患者手术前后外周血中ＩＬ２ 水平及ＣＤ２５ 表达均低于对照组,而ｓＩＬ２Ｒ与ＰＧＥ２ 水平均高于对照组;切除肿瘤后ＩＬ２ 水平及ＣＤ２５ 表达较术前升高,而ｓＩＬ２Ｒ及ＰＧＥ２ 水平较术前下降;６ 例术后发生肿瘤转移或复发的患者中,再次出现ＩＬ２ 水平及ＣＤ２５ 表达下降,而ｓＩＬ２Ｒ及ＰＧＥ２ 水平上升,胃癌患者术前ＩＬ２ 水平与术前ＰＧＥ２ 水平呈显著负相关,术前ｓＩＬ２Ｒ水平与ＩＬ２ 水平亦呈显著负相关。结论　ＰＧＥ２ 与ｓＩＬ２Ｒ 参与了胃癌患者术前存在的免疫抑制过程。非甾体抗炎药（ＮＳＡＩＤ）与外源性ＩＬ２ 联合应用以预防胃癌转移或复发理论上具有可行性。     

HCCR-2反义核酸对肝癌HepG2细胞的作用

目的 研究反义HCCR-2真核表达载体对肝癌HepG2细胞增殖及凋亡的影响.方法 构建反义HCCR-2真核表达载体(反义载体组),转染肝癌HepG2细胞,G418筛选阳性克隆,同样方法获得空载体pIRES2-EGFP稳定表达的细胞株(空载体组),取肝癌HepG2细胞为对照(肝癌HepG2组),用MTT法、流式细胞仪、透射电镜观察反义HCCR-2转染前后肝癌HepG2细胞生长曲线、细胞周期、细胞凋亡及细胞形态的变化.采用单因素方差分析和χ2检验比较各组差异.结果 反义载体组、空载体组、肝癌HepG2组HCCR-2 mRNA表达水平分别为0.39±0.04、0.62±0.06、0.72±0.03,3组比较差异有统计学意义(F=43.701,P<0.05);细胞凋亡率分别为13.30%、2.51%、2.07%,反义载体组与空载体组、肝癌HepG2组比较,差异有统计学意义(χ2=6.793,8.721,P<0.05);反义载体组细胞生长减慢,阻滞于G0/G1期.结论 HCCR-2反义核酸真核表达载体能抑制HCCR-2 mRNA的表达,促进细胞凋亡,HCCR-2蛋白可能参与肝癌细胞的周期调控,并与细胞的生长增殖有关.     

异丙酚麻醉下PaCO2对SjvO2影响的年龄差异

目的研究异氟醚和异丙酚维持神经外科手术中低碳酸和高碳酸血症对颈静脉球血氧饱和度(SjvO     

MMP-2和TIMP-2在大肠癌组织中的表达及其意义

目的探讨基质金属蛋白酶-2(MMP-2)和组织基质金属蛋白抑制剂-2(TIMP-2)在大肠癌组织中的表达及其意义。方法应用免疫组织化学SP法对60例大肠癌组织MMP-2和TIMP-2表达情况进行检测。结果MMP-2和TIMP-2在大肠癌组织中表达的阳性率分别为64.3%和30.3%。MMP-2的表达与大肠癌的病理分期和淋巴转移呈正相关(P<0.05),而TIMP-2的表达与其呈负相关,MMP-2和TIMP-2的表达呈负相关(P<0.05)。结论MMP-2和TIMP-2的表达与大肠癌的病理分期和淋巴转移密切相关,可作为判断大肠癌生物学行为的参考指标。     

重组合异种骨移植对IL－2生成影响的研究

采用重组合异种骨（ＲＢＸ）移植建立ＢＡＬＢ／Ｃ小鼠股后肌袋模型，以研究对Ｔ淋巴细胞分泌ＩＬ－２的功能变化及对细胞免疫的影响，结果显示：（１）ＲＢＸ移植后２天ＩＬ－２升高是由于手术创伤刺激所致的应激反应；（２）术后７～１４天ＲＢＸ、ｂＢＭＰ对ＩＬ－２产生有显著的抑制作用，２８～４２天回升：（３）对Ｔ淋巴细胞功能的抑制作用主要是ＢＭＰ所致，经处理的牛板质骨粒不具免疫源性。提示：ＲＢＸ移植无明显免疫排异反应，ＢＭＰ能抑制Ｔ细胞的活化增殖，使细胞因子分泌减少，因而降低厂细胞免疫水平，ＢＭＰ可能属于一种新的兔疫调节因子。实验结果对ＲＢＸ移植既能成骨又不发生明显的免疫排异的机理是一种有意义的探讨。