细胞受到外界刺激导致DNA损伤时,DNA修复蛋白被激活并发挥功能,受损DNA得到修复。近年来研究表明,转录因子特异性蛋白1(specificity protein 1,Sp1)在DNA损伤修复中起重要作用,是参与调控DNA损伤应答与修复的重要蛋白之一。Sp1在多种肿...细胞受到外界刺激导致DNA损伤时,DNA修复蛋白被激活并发挥功能,受损DNA得到修复。近年来研究表明,转录因子特异性蛋白1(specificity protein 1,Sp1)在DNA损伤修复中起重要作用,是参与调控DNA损伤应答与修复的重要蛋白之一。Sp1在多种肿瘤中高表达,通过调节细胞增殖、迁移和侵袭促进肿瘤的发生和发展,不利于肿瘤治疗。本文首先介绍Sp1特有的结构及其生理功能,由此引入Sp1通过转录依赖方式调控DNA损伤应答,其次介绍Sp1通过非转录依赖方式参与DSB修复,以及Sp1在肿瘤治疗中的研究进展,最后展望研究Sp1的意义及可能具有的应用前景。展开更多
In this paper, we deal with the problem of optimal control of a deterministic model of hepatitis C virus （HCV）. In the first part of our analysis, a mathematical modeling of HCV dynamics which can be controlled by a...In this paper, we deal with the problem of optimal control of a deterministic model of hepatitis C virus （HCV）. In the first part of our analysis, a mathematical modeling of HCV dynamics which can be controlled by antiretroviral therapy as fixed controls has been presented and analyzed which incorporates two mechanisms： infection by free virions and the direct cell-to-cell transmission. Basic reproduction number is calculated and the existence and stability of equilibria are investigated. In the second part, the optimal control problem representing drug treatment strategies of the model is explored considering control parameters as time-dependent in order to minimize not only the population of infected cells but also the associated costs. At the end of the paper, the impact of combination of the strategies in the control of HCV and their effectiveness are compared by numerical simulation.展开更多
文摘细胞受到外界刺激导致DNA损伤时,DNA修复蛋白被激活并发挥功能,受损DNA得到修复。近年来研究表明,转录因子特异性蛋白1(specificity protein 1,Sp1)在DNA损伤修复中起重要作用,是参与调控DNA损伤应答与修复的重要蛋白之一。Sp1在多种肿瘤中高表达,通过调节细胞增殖、迁移和侵袭促进肿瘤的发生和发展,不利于肿瘤治疗。本文首先介绍Sp1特有的结构及其生理功能,由此引入Sp1通过转录依赖方式调控DNA损伤应答,其次介绍Sp1通过非转录依赖方式参与DSB修复,以及Sp1在肿瘤治疗中的研究进展,最后展望研究Sp1的意义及可能具有的应用前景。
文摘In this paper, we deal with the problem of optimal control of a deterministic model of hepatitis C virus （HCV）. In the first part of our analysis, a mathematical modeling of HCV dynamics which can be controlled by antiretroviral therapy as fixed controls has been presented and analyzed which incorporates two mechanisms： infection by free virions and the direct cell-to-cell transmission. Basic reproduction number is calculated and the existence and stability of equilibria are investigated. In the second part, the optimal control problem representing drug treatment strategies of the model is explored considering control parameters as time-dependent in order to minimize not only the population of infected cells but also the associated costs. At the end of the paper, the impact of combination of the strategies in the control of HCV and their effectiveness are compared by numerical simulation.
