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Caspase-3 activation as a key factor for HBx-transformed cell death
Kim, A.,Kwon, O. S.,Kim, S. O.,He, L.,Bae, E. Y.,Lee, M. S.,Jeong, S. J.,Shim, J. H.,Yoon, D. Y.,Kim, C. H.,Moon, A.,Kim, K. E.,Ahn, J. S.,Kim, B. Y. Blackwell Publishing Ltd 2008 Cell proliferation Vol.41 No.5
<P>Abstract. </P><P><I>Objectives</I>: Nuclear factor-kappa B (NF-&kgr;B) activation has been associated with the tumorigenic growth of hepatitis B virus X protein (HBx)-transformed cells. This study was aimed to find a key target for treatment of HBx-mediated cancers. <I>Materials and methods</I>: NF-&kgr;B activation, endoplasmic reticulum-stress (ER-stress), caspase-3 activation, and cell proliferation were evaluated after Chang/HBx cells permanently expressing HBx viral protein were treated with inhibitors of NF-&kgr;B, proteasome and DNA topoisomerase. <I>Results</I>: Inhibition of NF-&kgr;B transcriptional activity by transient transfection with mutant plasmids encoding Akt1 and glycogen synthase kinase-3&bgr; (GSK-3&bgr;), or by treatment with chemical inhibitors, wortmannin and LY294002, showed little effect on the survival of Chang/HBx cells. Furthermore, I&kgr;Bα (S32/36A) mutant plasmid or other NF-&kgr;B inhibitors, 1-pyrrolidinecarbonidithioic acid and sulphasalazine, were also shown to have little effect on the cell proliferation. By contrast, proteasome inhibitor-1 (Pro1) and MG132 enhanced the HBx-induced ER-stress response and the subsequent activation of caspase-12, -9 and -3 and reduced cell proliferation. Camptothecin (CPT), however, triggered activation of caspase-3 without induction of caspase-12, and reduced cell proliferation. In addition, CPT-induced cell death was reversed by pre-treatment with z-DEVD, a caspase-3-specific inhibitor. <I>Conclusions</I>: Detailed exploitation of the regulators of caspase-3 activation could open the gate for finding an efficient target for development of anticancer therapeutics against HBx-transformed hepatocellular carcinoma.</P>
Kim, E-K,Seo, H-S,Chae, M-J,Jeon, I-S,Song, B-Y,Park, Y-J,Ahn, H M,Yun, C-O,Kang, C-Y Macmillan Publishers Limited 2014 Gene therapy Vol.21 No.1
For successful clinical tumor immunotherapy outcomes, strong immune responses against tumor antigens must be generated. Cell-based vaccines compromise one strategy with which to induce appropriate strong immune responses. Previously, we established a natural killer T-cell (NKT) ligand-loaded, adenoviral vector-transduced B-cell-based anticancer cellular vaccine. To enhance tumor antigen delivery to B cells, we established a modified adenoviral vector (Ad-k35) that encoded a truncated form of the breast cancer antigen Her2/neu (Ad-k35HM) in which fiber structure was substituted with adenovirus serotype 35. We observed increased tumor antigen expression with Ad-k35HM in both human and murine B cells. In addition, an Ad-k35HM-transduced B-cell vaccine elicited strong antigen-specific cellular and humoral immune responses that were further enhanced with the additional loading of soluble NKT ligand KBC009. An Ad-k35HM-transduced, KBC009-loaded B-cell vaccine efficiently suppressed the in vivo growth of established tumors in a mouse model. Moreover, the vaccine elicited human leukocyte antigen (HLA)-A2 epitope-specific cytotoxic T-cell responses in B6.Cg (CB)-Tg (HLA-A/H2-D) 2Enge/Jat mice. These findings indicated that the Ad-k35 could be appropriate for the preclinical and clinical development of B-cell-based anticancer immunotherapies.
Ahn, C.I.,Koo, H.M.,Jo, J.M.,Roh, H.S.,Lee, J.B.,Lee, Y.J.,Jang, E.J.,Bae, J.W. Elsevier BV 2016 Applied Catalysis B Vol. No.
<P>The metal oxide pillared ordered-mesoporous Co3O4 was investigated to design a stable and superior catalyst for CO hydrogenation into linear hydrocarbons through Fischer Tropsch Synthesis (FTS) reaction. Enhanced structural stability was observed in ordered-mesoporous Co3O4 even under hydrogen-excess conditions after modification with a metal oxide pillar of Al2O3. The mesoporous Co3O4 was synthesized using a hard template of highly ordered three dimensional mesoporous KIT-6. A small number of metal oxide pillars such as Al2O3, Mn2O4, and SiO2 with 5 wt% were subsequently added to the orderedmesoporous Co3O4 through the incipient wetness impregnation method. The Al2O3-modifed mesoporous Co3O4 catalyst demonstrated superior CO conversion with a stable activity in CO hydrogenation reaction. The enhanced catalytic stability seems to be attributable to the lower mobility of the Al2O3 pillar which formed stronger interactions with the mesoporous Co3O4 inner surfaces. The Al2O3 modification can effectively stabilize ordered-mesoporous structures of Co3O4 by acting as an ordered mesoporous channel reactor and enhancing the transport rate of hydrocarbons formed during FTS reaction. (C) 2015 Elsevier B.V. All rights reserved.</P>
조사료의 급여수준이 한우 거세우의 성장 및 육질에 미치는 영향
안병홍,안동원,류재숙,강효봉,정정수 한국동물자원과학회 2000 한국축산학회지 Vol.42 No.5
Fifteen Hanwoo steers aged about 6 months and weighing about 180kg were randomly allotted into one of three levels(40-11%, 45-13% and 50-15%) of roughage from growing period to investigate the effects of levels of roughage on body gain, carcass grade, blood components and economic analysis of Hanwoo steers. These levels of roughage were manipulated at an interval of 50kg body weight untill body weight reached about 600kg. Steers fed 40-11% or 45-13% roughage did not differ in daily body gain but steers fed 50-15% roughage were significantly(p$lt;0.05) lower in daily body gain than steers fed 40-11% or 45-13% roughage. However, the ribeye area, marbling score, backfat thickness, beef color and fat color were not affected by the levels of roughage. Beef grade tended to improve with increasing levels of roughage in the ration. Blood components such as triglyceride and cholesterol were not affected by the levels of roughage. Steers offered 45-13% roughage during the growing period were the most profitable in economical analysis. Therefore, according to this study it can be concluded that feeding 45-13% roughage from the growing period to finishing period is desirable for Hanwoo steers which will be fattened untill they reach 600kg body weight.