首页
登录
职称英语
Scientists say they have high hopes for a drug that could one day provide a n
Scientists say they have high hopes for a drug that could one day provide a n
游客
2024-06-01
12
管理
问题
Scientists say they have high hopes for a drug that could one day provide a new form of treatment for HIV-A1DS. A compound, which interferes with an elusive protein used by the HIV virus to infect human cells, has worked extremely well in monkeys. If the drug proves effective in human trials, scientists say, it could bolster (加强) the effectiveness of two existing AIDS drugs, particularly in fighting drug-resistant strains of the virus.
Researchers at the pharmaceutical (制药的) company Merck are very excited about an experimental drug, which has worked as well in monkeys infected with a primate version of the virus as any of the existing anti-AIDS drugs.
It works by blocking one of three proteins, or enzymes, the HIV virus uses to gain entrance into and infect human immune system cells.
Inhibitor drugs have been developed to block two of the proteins, to slow progression of the disease after infection. They have become standard therapy as a "cocktail" for people infected with HIV.
Those erzymes are reverse transcriptase (转录酶) and protease (蛋白酶). The first converts the virus’ genetic material into that of its host cells. The second chops up the resulting larger proteins into smaller pieces, producing smaller viral particles that infect new cells.
The third prong of cellular attack is a protein called integrase(整合酶), which experts say has been harder to block. Once HIV fools host cells by changing its genetic information so it can enter them, integrase acts like a cut and paste operation in a word processor, deleting an immune cell’s genetic material and replacing it with its own.
An integrase inhibitor would give doctors a third line of attack against HIV infection, according to virologist Daria Hazuda of the division of Virus and Cell Biology at Merck.
"This would offer a third class of anti-retroviral medications that can be combined with reverse transcriptase inhibitors and protease inhibitors. And since it is a new mechanism of action, these compounds are active against multi-drug resistant variants. So variants that are resistant to all current therapies have been selected in HIV-patients," she said.
Current anti-AIDS drugs eventually become resistant to therapy, or stop working, because the virus changes its shape.
While researchers are encouraged by the success with the compound’s effectiveness in monkey trials, developing a drug that is equally effective in humans can be difficult.
Steven Young is executive director of the Department of Medicinal Chemistry at Merck. He says, if scientists find a compound that is equally effective in people, the company would ask U.S. regulators to speed approval of the drug.
"Yeah, I really think that’s what we’re hoping for," he said. "I mean, we need to get data that show it has robust anti-viral effects in people. And if we’re able to get that data, I think we would petition for Past track status."
Dr. Young says an integrase inhibitor has the potential to prevent drug resistance.
"To ensure our best chances of preventing resistance, we would give this as part of a cocktail therapy," he added. "And I think it’s really our plan that we would test this with reverse transcriptase inhibitors and protease inhibitors, as well." [br] Why would anti-AIDS drugs stop working?
选项
答案
Because the virus changes its shape.
解析
根据题干中的关键问anti-AIDS drugs和stop working 定位到倒数第六段,可知现有的抗艾滋病药物最终就不会起作用了,因为病毒改变了形状,故可得答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3614924.html
相关试题推荐
Noiseentersourearsaspowerfulwavesofmechanicalenergy.Scientistsmea
Noiseentersourearsaspowerfulwavesofmechanicalenergy.Scientistsmea
______(即使计算是正确的),scientistscanneverbesurethattheyhaveincludedallvar
Themoretimescientistsspenddesigningcomputers,themoretheymarvelat
Themoretimescientistsspenddesigningcomputers,themoretheymarvelat
Themoretimescientistsspenddesigningcomputers,themoretheymarvelat
Thescientistshaveworkedout______.(一种可以大规模提高农业生产的方法)amethodbywhichthe
Scientistssaytheyhavehighhopesforadrugthatcouldonedayprovidean
Scientistssaytheyhavehighhopesforadrugthatcouldonedayprovidean
Americaisacountrythatnowsitsatopthecherishedmyththatworkprovide
随机试题
PassageTwo[br]WhydoesHECParischangeitsbusinessmodetocooperatewi
Art,saidPicasso,isaliethatmakesusrealizethetruth.Soisamap~We
Nodirectrelationshiphasbeenprovenbetweenhighcholesterollevelsandheart
根据生产任务和生产人员的劳动效率计算生产定员人数,主要适用于()岗位或工种。A
对选择IT服务外包可能给企业带来收益的描述中,不正确的是()。A.成本效益
下列关于询价制度的说法中,正确的有()。 Ⅰ.对在深交所中小企业板上市的公司,
形成旅游市场机制的动力之源是()。A.旅游目的地政府的行政干预 B.旅行社
患者心悸怔忡,头晕健忘,腹胀便溏,神疲乏力,面色萎黄,舌淡脉弱,其诊断是( )
下列哪一种情形不成立累犯? A.张某犯故意伤害罪被判处有期徒刑3年,缓.刑3
低钾血症的临床表现为A.腹胀、恶心、呕吐 B.肠麻痹 C.心律不齐 D.心
最新回复
(
0
)