The identification of novel biomarkers for early prostate cancer diagnosis is highly important because early detection and treatment are critical for the medical management of patients. Disruption in the continuity of...The identification of novel biomarkers for early prostate cancer diagnosis is highly important because early detection and treatment are critical for the medical management of patients. Disruption in the continuity of both the basal cell layer and basement membrane is essential for the progression of high-grade prostatic intraepithelial neoplasia （HGPIN） to invasive adenocarcinoma in human prostate. The molecules involved in the conversion to an invasive phenotype are the subject of intense scrutiny. We have previously reported that matrix metalloproteinase-26 （MMP-26） promotes the invasion of human prostate cancer cells via the cleavage of basement membrane proteins and by activating the zymogen form of MMP-9. Furthermore, we have found that tissue inhibitor of metalloproteinases-4 （TIMP-4） is the most potent endogenous inhibitor of MMP-26. Here we demonstrate higher （p〈0.0001） MMP-26 and TIMP-4 expression in HGPIN and cancer, compared to non-neoplastic acini. Their expression levels are highest in HGPIN, but decline in invasive cancer （p〈0.001 for each） in the same tissues. Immunohistochemical staining of serial prostate cancer tissue sections suggests colocalization of MMP-26 and TIMP-4. The present study indicates that MMP-26 and TIMP-4 may play an integral role during the conversion of HGPIN to invasive cancer and may also serve as markers for early prostate cancer diagnosis.展开更多
目的:通过免疫共沉淀与质谱分析技术从宫颈癌HeLa细胞中获取与S期激酶相关蛋白2(S-phase kinase-associated protein 2,SKP2)结合的蛋白质群体并预测其生物功能。方法:以免疫共沉淀与Western blotting技术建立SKP2免疫共沉淀体系,以SDS-...目的:通过免疫共沉淀与质谱分析技术从宫颈癌HeLa细胞中获取与S期激酶相关蛋白2(S-phase kinase-associated protein 2,SKP2)结合的蛋白质群体并预测其生物功能。方法:以免疫共沉淀与Western blotting技术建立SKP2免疫共沉淀体系,以SDS-PAGE和银染技术获得SKP2结合蛋白的特异条带,通过质谱分析技术获得可能与SKP2结合的蛋白群体,应用生物信息学技术对筛选得到的蛋白进行GO分析与KEGG分析。结果:HeLa细胞内存在一定水平的SKP2蛋白表达,可进行免疫共沉淀反应;成功建立了SKP2免疫共沉淀体系,并获得SKP2结合蛋白样品;针对差异的凝胶条带进行质谱分析,共鉴定出SKP2结合蛋白563个;设定筛选条件后,获得可信度较高的SKP2蛋白270个,进行GO分析与KEGG分析后初步预测了结合蛋白参与的细胞功能和信号通路。结论:从宫颈癌HeLa细胞中成功筛选获取SKP2结合蛋白,为后续筛选靶标结合蛋白和寻找细胞靶向药物奠定了基础。展开更多
文摘The identification of novel biomarkers for early prostate cancer diagnosis is highly important because early detection and treatment are critical for the medical management of patients. Disruption in the continuity of both the basal cell layer and basement membrane is essential for the progression of high-grade prostatic intraepithelial neoplasia （HGPIN） to invasive adenocarcinoma in human prostate. The molecules involved in the conversion to an invasive phenotype are the subject of intense scrutiny. We have previously reported that matrix metalloproteinase-26 （MMP-26） promotes the invasion of human prostate cancer cells via the cleavage of basement membrane proteins and by activating the zymogen form of MMP-9. Furthermore, we have found that tissue inhibitor of metalloproteinases-4 （TIMP-4） is the most potent endogenous inhibitor of MMP-26. Here we demonstrate higher （p〈0.0001） MMP-26 and TIMP-4 expression in HGPIN and cancer, compared to non-neoplastic acini. Their expression levels are highest in HGPIN, but decline in invasive cancer （p〈0.001 for each） in the same tissues. Immunohistochemical staining of serial prostate cancer tissue sections suggests colocalization of MMP-26 and TIMP-4. The present study indicates that MMP-26 and TIMP-4 may play an integral role during the conversion of HGPIN to invasive cancer and may also serve as markers for early prostate cancer diagnosis.
文摘目的:通过免疫共沉淀与质谱分析技术从宫颈癌HeLa细胞中获取与S期激酶相关蛋白2(S-phase kinase-associated protein 2,SKP2)结合的蛋白质群体并预测其生物功能。方法:以免疫共沉淀与Western blotting技术建立SKP2免疫共沉淀体系,以SDS-PAGE和银染技术获得SKP2结合蛋白的特异条带,通过质谱分析技术获得可能与SKP2结合的蛋白群体,应用生物信息学技术对筛选得到的蛋白进行GO分析与KEGG分析。结果:HeLa细胞内存在一定水平的SKP2蛋白表达,可进行免疫共沉淀反应;成功建立了SKP2免疫共沉淀体系,并获得SKP2结合蛋白样品;针对差异的凝胶条带进行质谱分析,共鉴定出SKP2结合蛋白563个;设定筛选条件后,获得可信度较高的SKP2蛋白270个,进行GO分析与KEGG分析后初步预测了结合蛋白参与的细胞功能和信号通路。结论:从宫颈癌HeLa细胞中成功筛选获取SKP2结合蛋白,为后续筛选靶标结合蛋白和寻找细胞靶向药物奠定了基础。
