An HIV/AIDS vaccine¹ candidate developed by researchers at Oregon Health & Science University appears to have the ability to completely clear an AIDS-causing virus from the body. The promising² vaccine candidate is being developed at OHSU's Vaccine and Gene³ Therapy Institute. It is being tested through the use of a non-human primate⁴ form of HIV, called simian⁵（猴子，类人猿） immunodeficiency virus, or SIV, which causes AIDS in monkeys. Following further development, it is hoped an HIV-form of the vaccine candidate can soon be tested in humans. These research results were published online today by the journal Nature. The results will also appear in a future print version of the publication.

 

"To date, HIV infection has only been cured in a very small number of highly-publicized but unusual clinical cases in which HIV-infected individuals were treated with anti-viral medicines very early after the onset⁶ of infection or received a stem cell transplant to combat cancer," said Louis Picker, M.D., associate director of the OHSU Vaccine and Gene Therapy Institute. "This latest research suggests that certain immune responses elicited⁷ by a new vaccine may also have the ability to completely remove HIV from the body."

 

The Picker lab's approach involves the use of cytomegalovirus（巨细胞病毒）, or CMV, a common virus already carried by a large percentage of the population. In short, the researchers discovered that pairing CMV with SIV had a unique effect. They found that a modified version of CMV engineered to express SIV proteins generates and indefinitely maintains so-called "effector memory" T-cells that are capable of searching out and destroying SIV-infected cells.

 

T-cells are a key component⁸ of the body's immune system, which fights off disease, but T-cells elicited by conventional vaccines⁹ of SIV itself are not able to eliminate the virus. The SIV-specific T-cells elicited by the modified CMV were different. About 50 percent of monkeys given highly pathogenic SIV after being vaccinated¹⁰ with this vaccine became infected with SIV but over time eliminated all trace of SIV from the body. In effect, the hunters of the body were provided with a much better targeting system and better weapons to help them find and destroy an elusive¹¹ enemy.

 

"Through this method we were able to teach the monkey's body to better 'prepare its defenses' to combat the disease," explained Picker. "Our vaccine mobilized a T-cell response that was able to overtake the SIV invaders¹² in 50 percent of the cases treated. Moreover, in those cases with a positive response, our testing suggests SIV was banished¹³ from the host. We are hopeful that pairing our modified CMV vector with HIV will lead to a similar result in humans."

 

The Picker lab is now investigating the possible reasons why only a subset of the animals treated had a positive response in hopes that the effectiveness of the vaccine candidate can be further boosted.

 

This research was funded by several grants from the National Institutes of Health, funding from the International AIDS Vaccine Initiative and a CAVD grant from the Bill & Melinda Gates Foundation.

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