Neutralizing Antibodies are the New Hope for Developing Potent HIV/AIDS Vaccines

by Julia Samuel on  July 14, 2015 at 3:21 PM AIDS/HIV News
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Newer solutions have been introduced on how to develop effective HIV/AIDS vaccines based on the actions of neutralizing antibodies in fighting against several subtypes of HIV-1.
Neutralizing Antibodies are the New Hope for Developing Potent HIV/AIDS Vaccines
Neutralizing Antibodies are the New Hope for Developing Potent HIV/AIDS Vaccines

The major problem of HIV/AIDS vaccines designed is the uncertainty as to whether or not it can protect people against diverse human immunodeficiency virus-1 (HIV-1) subtypes. Despite the number of different immunogens that has been tested in animals and humans there remains no answer still regarding what specific HIV-1 subtypes does this vaccine target.

Recent studies reveal that neutralizing antibodies (Nabs) may help scientists develop an effective vaccine for HIV/AIDS.

Researchers examined neutralizing antibody responses elicited by sequential infections of different HIV-1 subtypes - also known as superinfection (SI). They examined whether this could lead to a more potent Nabs response necessary to design stronger HIV/AIDS vaccines.

Julie Overbaugh, from the Fred Hutchinson Cancer Research Center in Seattle, USA, and her team examined SI Nab responses from a cohort of 21 superinfected women and found out that 20 of them developed a broad and more potent Nab response after superinfection.

"Learning how to elicit a potent, cross-reactive neutralizing antibody response capable of protecting against globally diverse HIV-1 subtypes is critical to the development of an HIV-1 vaccine," said Overbaugh and her team.

"Our study helps to inform vaccine design by highlighting the prospect of eliciting broad and diverse HIV-specific Nab responses through sequential exposure to different HIV antigens," the authors added.

In another study, researchers ascertained the efficacy of possible HIV/AIDS vaccines through exploring the capacity of Nabs to neutralize and block cell-to-cell transmission of HIV-1.

Possible combinations of a number of Nabs were tested each for efficacy assessment in both preventing free virus infection and blocking HIV-1 cell-to-cell transmission.

Alexandra Trkola from the University of Zurich, Switzerland and her team designed an assay that will test the potency of Nabs (in different combinations) in between HIV-1 free infection and HIV-1 cell-to-cell transmission. There they found that the efficacy of Nabs really varies depending on which type of transmission and entry process does HIV-1 undergo, and that there is a need of powerful combinations of Nabs in order to effectively prevent transmission.

"When selecting broadly neutralizing antibodies (Nabs) for clinical application, potency and breadth against free viruses are vital, but additional features may be needed to ensure in vivo efficacy," said Trkola.

These two findings provide workable suggestions on what to consider in effectively designing potent HIV/AIDS vaccines that can target all diverse subtypes of HIV-1.

Source: Medindia

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