HIV protein breaks biological clock | Science News



Support credible science journalism.

Subscribe to Science News today.


HIV protein breaks biological clock

10:15am, November 24, 2003

From New Orleans, at a meeting of the Society for Neuroscience

Among the many troubles HIV causes, is apparently a disruption of a person's daily, or circadian, rhythms. "Sleep seems to be a persistent problem" in HIV-infected people, notes John P. Clark of the University of Minnesota at Minneapolis–St. Paul.

The AIDS virus typically infects immune cells, so it hasn't been clear how it might alter the body's biological clock, which is controlled by a brain region called the suprachiasmatic nucleus (SCN). HIV, however, can infect brain cells within as little as a few weeks after a person has contracted the virus.

Clark and his colleagues exposed living slices of SCN tissue from rodents to an HIV protein called Tat and found that the protein altered the slices' circadian rhythm of electrical activity. Researchers used to think that Tat turned on only viral genes needed for HIV to replicate, but they now suspect that the protein is a toxin and may have

This article is available only to subscribing members. Join the Society today or Log in.

Get Science News headlines by e-mail.

More from this issue of Science News

From the Nature Index Paid Content