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:ok An extract from a plant used in traditional Chinese medicine may help protect the genes of immune system cells and, as a result, enhance their ability to fight HIV, according to a new study announced by the University of California Los Angeles (UCLA) and published in The Journal of Immunology.
加州大学洛杉机分校科学家发表在The Journal of Immunology(2006年影响因子为7.412)上的文章报道称,一种中药的提取物可能对免疫细胞基因具有保护作用,从而会增强其抵抗HIV的能力。
When cells reproduce, their DNA gets capped at the ends by long repeated strands of genes called telomeres. Telomeres protect the genes, much like the plastic tips on the ends of shoelaces. Unfortunately, telomeres get shorter every time a cell reproduces, which ultimately causes the cells to become “exhausted” and to stop functioning properly. This occurs naturally as a person ages, but more rapidly in the HIV-fighting CD4 and CD8 cells of people with HIV.
在细胞的复制过程中,DNA在末端以重复序列的方式给自己戴上一顶“帽子”,也即是端粒。端粒可以保护基因,这种情况恰恰像鞋带末端的塑料帽。不幸的是,细胞每分裂一次,端粒就会缩短一些,最终耗竭而导致细胞完全失去功能。随着人体的衰老,这样的现象是自然出现的,但是在人体对HIV抗战细胞CD4和CD8身上却来的更快一些。
One of the lead researchers in telomeres and HIV, Rita Effros, PhD, and her colleague Steven Russell Fauce, PhD, of the department of pathology at UCLA, had experimented with gene therapy as a way to keep telomeres from shortening. But ultimately the researchers turned to what could potentially be a much less expensive method: an extract from the medicinal plant astragalus.
一位在端粒和HIV方面的首席研究员Rita Effros博士和他的同事加州大学洛杉机分校病理学系的Steven Russell Fauce博士曾对延缓端粒缩短的基因治疗开展过研究,但研究人员最终转向一种可能更为节省花费的方法,那就是药用植物-----黄芪。
According to Effros and Fauce, the extract, TAT2, keeps an enzyme called telomerase turned on. CD4s and CD8s can naturally produce telomerase, which helps keep telomeres from shortening, but only for so long. After a cell has divided too many times, the telomerase gene turns off.
根据他们的研究,黄芪的提取物TAT2,可以保持端粒酶为开启状态。CD4和CD8细胞可自然产生端粒酶,而阻滞端粒的缩短,但时间比较短,在细胞分裂很多次后,端粒酶的基因即被关闭。
In test tube experiments, Effros and Fauce exposed CD4 and CD8 cells collected from HIV-positive patients to TAT2. Not only did the substance slow the shortening of the cells’ telomeres, but it also increased the cells’ production of proteins known to inhibit HIV replication.
体外试验中,Effros和Fauce将自HIV阳性病人收集的CD4和CD8细胞暴露于TAT2中,发现TAT2不但可以延缓细胞端粒的缩短,而且可以增加具有抑制HIV复制作用的蛋白产生。
While studies of TAT2 have not yet been conducted in people, the authors believe the strategy “could be useful in treating HIV disease, as well as immunodeficiency and increased susceptibility to other viral infections associated with chronic diseases or aging.”
虽然关于TAT2的人体试验尚未开展,但是作者相信这种策略“对免疫缺陷以及HIV疾病的治疗是有益的,同时可以增强因慢性病、老化相关的对其他病毒的易感性”
全文:
加州大学洛杉机分校科学家发表在The Journal of Immunology(2006年影响因子为7.412)上的文章报道称,一种中药的提取物可能对免疫细胞基因具有保护作用,从而会增强其抵抗HIV的能力。
在细胞的复制过程中,DNA在末端以重复序列的方式给自己戴上一顶“帽子”,也即是端粒。端粒可以保护基因,这种情况恰恰像鞋带末端的塑料帽。不幸的是,细胞每分裂一次,端粒就会缩短一些,最终耗竭而导致细胞完全失去功能。随着人体的衰老,这样的现象是自然出现的,但是在人体对HIV抗战细胞CD4和CD8身上却来的更快一些。
一位在端粒和HIV方面的首席研究员Rita Effros博士和他的同事加州大学洛杉机分校病理学系的Steven Russell Fauce博士曾对延缓端粒缩短的基因治疗开展过研究,但研究人员最终转向一种可能更为节省花费的方法,那就是药用植物-----黄芪。
根据他们的研究,黄芪的提取物TAT2,可以保持端粒酶为开启状态。CD4和CD8细胞可自然产生端粒酶,而阻滞端粒的缩短,但时间比较短,在细胞分裂很多次后,端粒酶的基因即被关闭。
体外试验中,Effros和Fauce将自HIV阳性病人收集的CD4和CD8细胞暴露于TAT2中,发现TAT2不但可以延缓细胞端粒的缩短,而且可以增加具有抑制HIV复制作用的蛋白产生。
虽然关于TAT2的人体试验尚未开展,但是作者相信这种策略“对免疫缺陷以及HIV疾病的治疗是有益的,同时可以增强因慢性病、老化相关的对其他病毒的易感性” |