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Scientists reactivate immune cells exhausted by chronic HIV

Date:
June 4, 2011
Source:
NIH/National Institute of Allergy and Infectious Diseases
Summary:
Scientists have demonstrated why certain immune cells chronically exposed to HIV shut down, and how they can be reactivated.

Scientists at the National Institute of Allergy and Infectious Diseases (NIAID), part of the National Institutes of Health, have demonstrated why certain immune cells chronically exposed to HIV shut down, and how they can be reactivated.

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Healthy B cells have a balanced mix of surface proteins that the immune system can use, like the gas pedal and brake of a car, either to activate the cell or to damp down its activity. However, in people with long-term HIV infection who have not begun antiretroviral therapy, their B cells -- responsible for producing anti-HIV antibodies -- display a surplus of inhibitory receptors, the surface proteins used to apply the brakes on a B cell. Scientists from the NIAID Laboratory of Immunoregulation led by Lela Kardava, Ph.D., Susan Moir, Ph.D., and Anthony S. Fauci, M.D., NIAID Director and Chief of the laboratory, wanted to know if this phenomenon can help explain why B cells become "exhausted" and essentially shut down in people who are HIV-infected but treatment-naive.

To test their hypothesis, the scientists used molecules called small interfering RNAs (siRNAs), which acted at the genetic level to prevent exhausted B cells from replenishing inhibitory receptors. After treatment with siRNAs, the exhausted cells responded more normally to conditions that typically would spur a B cell into action, such as the presence of a virus, demonstrating that the excess of inhibitory receptors may explain why exhausted B cells are so unresponsive.

Because B cells generally are difficult to manipulate, the new siRNA-based approach may hold promise for scientists seeking to develop therapies to improve the human antibody response against HIV and other pathogens by altering the expression of specific B-cell genes.

The research is published in the Journal of Clinical Investigation.


Story Source:

The above story is based on materials provided by NIH/National Institute of Allergy and Infectious Diseases. Note: Materials may be edited for content and length.


Journal Reference:

  1. Lela Kardava, Susan Moir, Wei Wang, Jason Ho, Clarisa M. Buckner, Jacqueline G. Posada, Marie A. O’Shea, Gregg Roby, Jenny Chen, Hae Won Sohn, Tae-Wook Chun, Susan K. Pierce, Anthony S. Fauci. Attenuation of HIV-associated human B cell exhaustion by siRNA downregulation of inhibitory receptors. Journal of Clinical Investigation, 2011; DOI: 10.1172/JCI45685

Cite This Page:

NIH/National Institute of Allergy and Infectious Diseases. "Scientists reactivate immune cells exhausted by chronic HIV." ScienceDaily. ScienceDaily, 4 June 2011. <www.sciencedaily.com/releases/2011/06/110603121840.htm>.
NIH/National Institute of Allergy and Infectious Diseases. (2011, June 4). Scientists reactivate immune cells exhausted by chronic HIV. ScienceDaily. Retrieved November 26, 2014 from www.sciencedaily.com/releases/2011/06/110603121840.htm
NIH/National Institute of Allergy and Infectious Diseases. "Scientists reactivate immune cells exhausted by chronic HIV." ScienceDaily. www.sciencedaily.com/releases/2011/06/110603121840.htm (accessed November 26, 2014).

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