从含麦迪霉素生物合成基因的初级克隆pCN6C5中,发现并分离了麦迪霉素4″酰化酶基因,与质粒载体p1J680相连,获得重组质粒p66B,在螺旋霉素产生菌中得到表达,其主要产物为4″异戊酰螺旋霉素。以p66B DNA BamHI-BamHI 2.3kb插入片段为探针,...从含麦迪霉素生物合成基因的初级克隆pCN6C5中,发现并分离了麦迪霉素4″酰化酶基因,与质粒载体p1J680相连,获得重组质粒p66B,在螺旋霉素产生菌中得到表达,其主要产物为4″异戊酰螺旋霉素。以p66B DNA BamHI-BamHI 2.3kb插入片段为探针,从麦迪霉素产生菌基因文库中获得了另一阳性克隆pCN10F5,Southern分子杂交确定pCN10F5 BamHI-BamHI 8.0kb为同源片段。以pWHM3及pIJ680为载体,获得重组质粒pWF5及p6F5,分子大小分别为15.2kb及13.3kb。通过DNA转化,并经分子杂交实验证明,获得含重组质粒的螺旋霉素产生菌克隆菌株。其主要产物经分离、纯化后,分析其理化性质和光谱数据,鉴定为丙酰螺旋霉素Ⅲ和Ⅱ。研究还表明,麦迪霉素基因文库中只有pCN10F5 DNA与碳霉素产生菌的4″异戊酰化酶基因同源,提示pCN6C5克隆携带的麦迪霉素4″酰化酶基因与pCN10F5的4″丙酰化酶基因及碳霉素4″异戊酰化酶基因有一定的区别。展开更多
Lymphomas enconlpass a group of malignancies that originate in the lymph nodes or other lymphoid tissues. Epigenetic modification, especially by histone deacetylase （HDACs）, plays a key role during the occurrence an...Lymphomas enconlpass a group of malignancies that originate in the lymph nodes or other lymphoid tissues. Epigenetic modification, especially by histone deacetylase （HDACs）, plays a key role during the occurrence and development of lymphomas. Consequently, HDAC inhibitors （HDACIs）, a class of gene expression-modulating drugs, have emerged as promising mechanism-based agents for the treatment of lymphomas. This review presents the rationale of HDAC inhibition, describes the epigenetic-based mechanisms of action of HDACIs, discusses their clinical efficiency, and summarizes the current and future developments in this field.展开更多
Objective： To investigate the anti-proliferative effect of histone deacetylases-1 （HDAC-1） knockdown in Hela cells. Methods： The HDAC-1 protein was knockdowned using siRNA. The expression of HDAC-1 was detected by...Objective： To investigate the anti-proliferative effect of histone deacetylases-1 （HDAC-1） knockdown in Hela cells. Methods： The HDAC-1 protein was knockdowned using siRNA. The expression of HDAC-1 was detected by Western blotting. Apoptosis was assessed by flow cytometry. The inhibition of cell growth was assesses by MTT assay. Results： HDAC-1 siRNA knockdowned the expression of HDAC-1 protein. HDAC siRNA inhibited the proliferation of Hela cells. HDAC- 1 siRNA induced apoptosis. Conclusion： HDAC-1 siRNA may inhibit the growth of Hela cells by inducing apoptosis.展开更多
The lysyl oxidase （LOX） family encodes the copper-dependent amine oxidases that play a key role in determining the tensile strength and structural integrity of connective tissues by catalyzing the crosslinking of el...The lysyl oxidase （LOX） family encodes the copper-dependent amine oxidases that play a key role in determining the tensile strength and structural integrity of connective tissues by catalyzing the crosslinking of elastin or collagen. Estrogen may upregulate the expression of LOXand lysyl oxidase-like 1 （LOXL1） in the vagina. The objec- tive of this study was to determine the effect of estrogen on the expression of all LOX family genes in the urogenital tissues of accelerated ovarian aging mice and human Ishikawa cells. Mice and Ishikawa cells treated with estradiol （E2） showed increased expression of LOXfamily genes and transforming growth factor IB1 （TGF-β1）. Ishikawa cells treated with TGF-β1 also showed increased expression of LOXfamily genes. The Ishikawa cells were then treated with either E2 plus the TGF-β receptor （TGFBR） inhibitor SB431542 or E2 alone. The expression of LOXfamily genes induced by E2 was reduced in the Ishikawa cells treated with TGFBR inhibitor. Our results showed that E2 increased the ex- prassion of the LOXfamily genes, and suggest that this induction may be mediated by the TGF-β signal pathway. E2 may play a role in regulating the expression of LOXfamily genes.展开更多
文摘Lymphomas enconlpass a group of malignancies that originate in the lymph nodes or other lymphoid tissues. Epigenetic modification, especially by histone deacetylase （HDACs）, plays a key role during the occurrence and development of lymphomas. Consequently, HDAC inhibitors （HDACIs）, a class of gene expression-modulating drugs, have emerged as promising mechanism-based agents for the treatment of lymphomas. This review presents the rationale of HDAC inhibition, describes the epigenetic-based mechanisms of action of HDACIs, discusses their clinical efficiency, and summarizes the current and future developments in this field.
文摘Objective： To investigate the anti-proliferative effect of histone deacetylases-1 （HDAC-1） knockdown in Hela cells. Methods： The HDAC-1 protein was knockdowned using siRNA. The expression of HDAC-1 was detected by Western blotting. Apoptosis was assessed by flow cytometry. The inhibition of cell growth was assesses by MTT assay. Results： HDAC-1 siRNA knockdowned the expression of HDAC-1 protein. HDAC siRNA inhibited the proliferation of Hela cells. HDAC- 1 siRNA induced apoptosis. Conclusion： HDAC-1 siRNA may inhibit the growth of Hela cells by inducing apoptosis.
基金supported by the National Basic Research Program(973)of China(No.2010CB945002)the Shandong Provincial Natural Science Foundation of China(No.ZR2013CQ041)the Independent Innovation Foundation of Shandong University(No.IIFSDU 2013GN011),China
文摘The lysyl oxidase （LOX） family encodes the copper-dependent amine oxidases that play a key role in determining the tensile strength and structural integrity of connective tissues by catalyzing the crosslinking of elastin or collagen. Estrogen may upregulate the expression of LOXand lysyl oxidase-like 1 （LOXL1） in the vagina. The objec- tive of this study was to determine the effect of estrogen on the expression of all LOX family genes in the urogenital tissues of accelerated ovarian aging mice and human Ishikawa cells. Mice and Ishikawa cells treated with estradiol （E2） showed increased expression of LOXfamily genes and transforming growth factor IB1 （TGF-β1）. Ishikawa cells treated with TGF-β1 also showed increased expression of LOXfamily genes. The Ishikawa cells were then treated with either E2 plus the TGF-β receptor （TGFBR） inhibitor SB431542 or E2 alone. The expression of LOXfamily genes induced by E2 was reduced in the Ishikawa cells treated with TGFBR inhibitor. Our results showed that E2 increased the ex- prassion of the LOXfamily genes, and suggest that this induction may be mediated by the TGF-β signal pathway. E2 may play a role in regulating the expression of LOXfamily genes.
