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AIDS virus can hide in bone marrow

Associated Press / March 8, 2010

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WASHINGTON - The virus that causes AIDS can hide in the bone marrow, avoiding drugs and later awakening to cause illness, according to new research that could point the way toward better treatments for the disease.

Finding that hide-out is a first step, but years of research lie ahead.

Dr. Kathleen Collins of the University of Michigan and her colleagues report in this week’s edition of the journal Nature Medicine that the HIV virus can infect long-lived bone marrow cells that eventually convert into blood cells.

The virus is dormant in the bone marrow cells, she said, but when those develop into blood cells, it can be reactivated and cause renewed infection. The virus kills the new blood cells and then moves on to infect other cells.

“If we’re ever going to be able to find a way to get rid of the cells, the first step is to understand’’ where a latent infection can continue, Collins said.

In recent years, drugs have reduced AIDS deaths sharply, but patients need to keep taking the medicines for life or the infection comes back, she said. That’s an indication that some of the disease remains hidden away to flare up once the therapy is stopped.

One hide-out was found earlier in blood cells called macrophages, and another was discovered in memory T-cells. But those couldn’t account for all the HIV virus still circulating, Collins said.

Eliminating these sources of infection would allow AIDS patients to stop taking drugs after their infection is over. That is critical in countries where the treatment is hard to afford and deliver.

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