AIM:This study was designed to compare the levels of v5 and v6 splice variants of CD44 evaluated using EITSA test in the serum of patients with colorectal cancer in different stages of progression of the disease estim...AIM:This study was designed to compare the levels of v5 and v6 splice variants of CD44 evaluated using EITSA test in the serum of patients with colorectal cancer in different stages of progression of the disease estimated in pT stage according to WHO score,histopathological grade of malignancy and some clinicopathological features. METHODS:The serum obtained from 114 persons with colorectal adenocarcinomas was examined using ELISA method,pT stage and grade of malignancy of the tumour were examined in formalin fixed and paraffin embedded materials obtained during operation. RESULTS:Only the level of CD44 v5 in the serum of patients before operation with G2 pT4 tumour was lower than that in other probes and the difference was statistically significant. We did not find any other correlations between the level of v5 and v6 CD44 variants and other evaluated parameters. CONCLUSION:The level of CD44 v5 and v6 estimated by ELISA test in the serum can not be used as a prognostic factor in colorectal cancer.展开更多
AIM:To investigate the role of osteopontin(OPN) and its splice variants in the proliferation of hepatocellular carcinoma(HCC).METHODS:The expression of OPN variants in HCC cell lines as well as HCC tissue samples and ...AIM:To investigate the role of osteopontin(OPN) and its splice variants in the proliferation of hepatocellular carcinoma(HCC).METHODS:The expression of OPN variants in HCC cell lines as well as HCC tissue samples and nontumour tissue was studied using polymerase chain reaction.OPN variant cDNAs were cloned into a mammalian expression vector allowing both transient expression and the production of stable OPN expressing cell lines.OPN expression was studied in these cells using Western blotting,immunofluoresnce and enzyme linked immunosorbent assay.A CD44 blocking antibody and siRNA targeting of CD44 were used to examine the role of this receptor in the OPN stimulated cell growth observed in culture.Huh-7 cells stably expressing either OPN-A,-B or-C were injected subcutaneously into the flanks of nude mice to observe in vivo tumour growth.Expression of OPN mRNA and protein in these tumours was examined using reverse transcriptionpolymerase chain reaction and immunohistochemistry.RESULTS:OPN is expressed in HCC in 3 forms,the full length OPN-A and 2 splice variants OPN-B and-C.OPN variant expression was noted in HCC tissue as well as cognate surrounding cirrhotic liver tissue.Expression of these OPN variants in the HCC derived cell line Huh-7 resulted in secretion of OPN into the culture medium.Transfer of OPN conditioned media to na ve Huh-7 and HepG2 cells resulted in significant cell growth suggesting that all OPN variants can modulate cell proliferation in a paracrine manner.Furthermore the OPN mediated increase in cellular proliferation was dependent on CD44 as only CD44 positive cell lines responded to OPN conditioned media while siRNA knockdown of CD44 blocked the proliferative effect.OPN expression also increased the proliferation of Huh-7 cells in a subcutaneous nude mouse tumour model,with Huh-7 cells expressing OPN-A showing the greatest proliferative effect.CONCLUSION:This study demonstrates that OPN plays a significant role in the proliferation of HCC through interaction with the cell surface receptor CD44.Modulation of this interaction could represent a novel strategy for the control of HCC.展开更多
目的探讨CD109在基底细胞样乳腺癌(basal-like breast cancer,BLBC)中的表达及意义。方法采用免疫组织化学(S-P法)检测86例基底细胞样乳腺癌和90例浸润性乳腺癌中CD109的表达情况。结果 CD109在基底细胞样乳腺癌和浸润性乳腺癌中的阳性...目的探讨CD109在基底细胞样乳腺癌(basal-like breast cancer,BLBC)中的表达及意义。方法采用免疫组织化学(S-P法)检测86例基底细胞样乳腺癌和90例浸润性乳腺癌中CD109的表达情况。结果 CD109在基底细胞样乳腺癌和浸润性乳腺癌中的阳性表达率分别为61.6%、8.9%,两组差异具有统计学意义(P<0.01);CD109在基底细胞样乳腺癌中的高表达与患者年龄、肿瘤大小、肿瘤的组织学分级和淋巴结累及情况均无关。CD109表达阳性乳腺癌中组织学Ⅲ级比例明显高于阴性组,Spearman等级相关分析显示CD109表达与肿瘤组织学分级呈正相关(r=0.365,P<0.01)。结论 CD109是基底细胞样乳腺癌新的特异性标志物,CD109的表达可能与肿瘤的侵袭性有关;鉴于CD109是一种细胞表面蛋白,其有可能成为治疗乳腺癌的一个潜在分子靶点。展开更多
文摘AIM:This study was designed to compare the levels of v5 and v6 splice variants of CD44 evaluated using EITSA test in the serum of patients with colorectal cancer in different stages of progression of the disease estimated in pT stage according to WHO score,histopathological grade of malignancy and some clinicopathological features. METHODS:The serum obtained from 114 persons with colorectal adenocarcinomas was examined using ELISA method,pT stage and grade of malignancy of the tumour were examined in formalin fixed and paraffin embedded materials obtained during operation. RESULTS:Only the level of CD44 v5 in the serum of patients before operation with G2 pT4 tumour was lower than that in other probes and the difference was statistically significant. We did not find any other correlations between the level of v5 and v6 CD44 variants and other evaluated parameters. CONCLUSION:The level of CD44 v5 and v6 estimated by ELISA test in the serum can not be used as a prognostic factor in colorectal cancer.
文摘AIM:To investigate the role of osteopontin(OPN) and its splice variants in the proliferation of hepatocellular carcinoma(HCC).METHODS:The expression of OPN variants in HCC cell lines as well as HCC tissue samples and nontumour tissue was studied using polymerase chain reaction.OPN variant cDNAs were cloned into a mammalian expression vector allowing both transient expression and the production of stable OPN expressing cell lines.OPN expression was studied in these cells using Western blotting,immunofluoresnce and enzyme linked immunosorbent assay.A CD44 blocking antibody and siRNA targeting of CD44 were used to examine the role of this receptor in the OPN stimulated cell growth observed in culture.Huh-7 cells stably expressing either OPN-A,-B or-C were injected subcutaneously into the flanks of nude mice to observe in vivo tumour growth.Expression of OPN mRNA and protein in these tumours was examined using reverse transcriptionpolymerase chain reaction and immunohistochemistry.RESULTS:OPN is expressed in HCC in 3 forms,the full length OPN-A and 2 splice variants OPN-B and-C.OPN variant expression was noted in HCC tissue as well as cognate surrounding cirrhotic liver tissue.Expression of these OPN variants in the HCC derived cell line Huh-7 resulted in secretion of OPN into the culture medium.Transfer of OPN conditioned media to na ve Huh-7 and HepG2 cells resulted in significant cell growth suggesting that all OPN variants can modulate cell proliferation in a paracrine manner.Furthermore the OPN mediated increase in cellular proliferation was dependent on CD44 as only CD44 positive cell lines responded to OPN conditioned media while siRNA knockdown of CD44 blocked the proliferative effect.OPN expression also increased the proliferation of Huh-7 cells in a subcutaneous nude mouse tumour model,with Huh-7 cells expressing OPN-A showing the greatest proliferative effect.CONCLUSION:This study demonstrates that OPN plays a significant role in the proliferation of HCC through interaction with the cell surface receptor CD44.Modulation of this interaction could represent a novel strategy for the control of HCC.
文摘目的探讨CD109在基底细胞样乳腺癌(basal-like breast cancer,BLBC)中的表达及意义。方法采用免疫组织化学(S-P法)检测86例基底细胞样乳腺癌和90例浸润性乳腺癌中CD109的表达情况。结果 CD109在基底细胞样乳腺癌和浸润性乳腺癌中的阳性表达率分别为61.6%、8.9%,两组差异具有统计学意义(P<0.01);CD109在基底细胞样乳腺癌中的高表达与患者年龄、肿瘤大小、肿瘤的组织学分级和淋巴结累及情况均无关。CD109表达阳性乳腺癌中组织学Ⅲ级比例明显高于阴性组,Spearman等级相关分析显示CD109表达与肿瘤组织学分级呈正相关(r=0.365,P<0.01)。结论 CD109是基底细胞样乳腺癌新的特异性标志物,CD109的表达可能与肿瘤的侵袭性有关;鉴于CD109是一种细胞表面蛋白,其有可能成为治疗乳腺癌的一个潜在分子靶点。