Advertisement
Advertisement


News

NIH Scientists Identify Potent Antibody That Neutralizes Nearly All HIV Strains

November 15, 2016

"The discovery and characterization of this antibody with exceptional breadth and potency against HIV provides an important new lead for the development of strategies to preven and treat HIV infection." -- NIAID Director Anthony S. Fauci, M.D.

Scientists from the National Institutes of Health have identified an antibody from an HIV-infected person that potently neutralized 98 percent of HIV isolates tested, including 16 of 20 strains resistant to other antibodies of the same class. The remarkable breadth and potency of this antibody, named N6, make it an attractive candidate for further development to potentially treat or prevent HIV infection, say the researchers.

The scientists, led by Mark Connors, M.D., of NIH's National Institute of Allergy and Infectious Diseases (NIAID), also tracked the evolution of N6 over time to understand how it developed the ability to potently neutralize nearly all HIV strains. This information will help inform the design of vaccines to elicit such broadly neutralizing antibodies.

Identifying broadly neutralizing antibodies against HIV has been difficult because the virus rapidly changes its surface proteins to evade recognition by the immune system. In 2010, scientists at NIAID's Vaccine Research Center (VRC) discovered an antibody called VRC01 that can stop up to 90 percent of HIV strains from infecting human cells. Like VRC01, N6 blocks infection by binding to a part of the HIV envelope called the CD4 binding site, preventing the virus from attaching itself to immune cells.

Findings from the current study showed that N6 evolved a unique mode of binding that depends less on a variable area of the HIV envelope known as the V5 region and focuses more on conserved regions, which change relatively little among HIV strains. This allows N6 to tolerate changes in the HIV envelope, including the attachment of sugars in the V5 region, a major mechanism by which HIV develops resistance to other VRC01-class antibodies.

The new findings suggest that N6 could pose advantages over VRC01, which currently is being assessed as intravenous infusions in clinical trials to see if it can safely prevent HIV infection in humans. Due to its potency, N6 may offer stronger and more durable prevention and treatment benefits, and researchers may be able to administer it subcutaneously (into the fat under the skin) rather than intravenously. In addition, its ability to neutralize nearly all HIV strains would be advantageous for both prevention and treatment strategies.


Article

J Huang, BH Kang, E Ishida, T Zhou et al. Identification of a CD4-binding site antibody to HIV that evolved near-pan neutralization breadth. Immunity DOI: 10.1016/j.immuni.2016.10.027 (2016).


Related Stories

Antibody VRC01 Safe, Only Modest Effect in Controlling HIV Without Antiretroviral Therapy
This Week in HIV Research: Antibody Being Tested for HIV Prevention, and Differing Results on HCV Treatment in Coinfection
New Treatment Signals Hope for Long-Term HIV Suppression



This article was provided by National Institute of Allergy and Infectious Diseases. Visit NIAID's website to find out more about their activities and publications.
 

No comments have been made.
 

Add Your Comment:
(Please note: Your name and comment will be public, and may even show up in
Internet search results. Be careful when providing personal information! Before
adding your comment, please read TheBody.com's Comment Policy.)

Your Name:


Your Location:

(ex: San Francisco, CA)

Your Comment:

Characters remaining:

Advertisement

The content on this page is free of advertiser influence and was produced by our editorial team. See our content and advertising policies.