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How New HIV Experimental Vaccines Could Help Eliminate The Virus

How New HIV Experimental Vaccines Could Help Eliminate The Virus

HIV and AIDS

A new experimental vaccine regimen, tailor made to fit of the structure of a vulnerable region on HIV, generated antibodies in mice, guinea pigs and monkeys, and it neutralized dozens of HIV strains. The findings will lead to human clinical trials for a vaccine capable of neutralizing a large fraction of common HIV strains.

The findings were published on June 4th in the journal Nature Medicine, and it was led by investigators from the National Institute of Allergy and Infectious Diseases, which falls under the National Institutes of Health.

Chief of the Structural Biology Section at the NIAID Vaccine Research Center Peter D. Kwong, Ph.D and John R. Mascola, M.D., center director, spearheaded the study. The study has been called “elegant” by research leaders.

“NIH scientists have used their detailed knowledge of the structure of HIV to find an unusual site of vulnerability on the virus and design a novel and potentially powerful vaccine,” said NIAID Director Anthony S. Fauci, M.D. “This elegant study is a potentially important step forward in the ongoing quest to develop a safe and effective HIV vaccine.”

The vaccine is epitope-based. An epitope is the specific site of an antigen to which an antibody binds. This vaccine is based on the site of a broad number of HIV strains that antibodies can bind to. This epitope was identified only two years ago.

First, scientists have to identify powerful antibodies that might have a chance at neutralizing HIV, then, they try to elicit those antibodies with a vaccine. The other approach is to conduct human trials in order to gather solid empirical data. A preliminary human trial of the team’s new vaccine regimen is anticipated to begin in the second half of 2019.

Investigators engineered many immunogens, or proteins designed to activate an immune response, to create the vaccine, using the known structure of the fusion peptide. The winning immunogen consisted of eight amino acids of the fusion peptide bonded to a carrier that generated a strong immune response. They also paired this immunogen with a replica of the HIV spike.

Investigators then tested different combinations of injections of the protein plus an HIV spike in mice and analyzed the antibodies that the vaccine regimens generated. The antibodies, as planned, attached to the HIV fusion peptide and neutralized up to 31 percent of viruses from a panel of 208 HIV strains from all around the world.

For the next step investigators moved onto guinea pigs and monkeys, and it also generated antibodies, providing more evidence that it could work on multiple species. Once they are able to determine a version safe enough for human trials, they can move forward and carefully test it on volunteers.

Other broadly neutralizing HIV vaccine candidates are currently being observed in a clinical setting such as HVTN 702 and Imbokodo clinical trials.

Now, investigators are looking at ways to improve the vaccine candidate by making it more potent and provide more consistent results. It’s one of the latest approaches in their attempt to develop a broadly neutralizing vaccine fit for the public that works on multiple strains of HIV.

While this is still ongoing, a recent study published in Nature  shows that the human body makes its own antivirals and the possibility of harnessing that ability could impact HIV treatment and prevention.

A release states, “It’s been known for years that humans and other mammals possess an antiviral gene called RSAD2 that prevents a remarkable range of viruses from multiplying. Now, researchers at Albert Einstein College of Medicine, part of Montefiore, have discovered the secret to the gene’s success: The enzyme it codes for generates a compound that stops viruses from replicating. The newly discovered compound offers a novel approach for attacking many disease-causing viruses.”

Could this possibly be a new-era to the elimination of this deadly virus? Africa can only hope to be a participant in this ground breaking findings as more than two-thirds of its population are living with the virus.

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