Monday, June 27

They identify a second untreated HIV patient whose body appears to have rid itself of the virus


The patient had no evidence of intact HIV genomes in more than 1.5 billion blood and tissue cells analyzed

A researcher studies HIV.
A researcher studies HIV.
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The doctor Xu Yu, member of the Ragon Institute, from Massachusetts General Hospital, in the United States, and his team have identified a second person with VIH untreated that seemed to have overcome the virus, according to published in the journal ‘Annals of Internal Medicine’. The patient showed no evidence of intact HIV genomes in more than 1.5 billion blood and tissue cells analyzed, suggesting that the virus had been cleared from the patient’s body.

Xu Yu studies how HIV stores copies of its genome in human cells, causing lifelong infection, and in 2020, he identified a first untreated HIV patient who appeared to have cleared the virus.

During infection, HIV places copies of its genome in the DNA of cells, creating what is known as a reservorio viral. In this state, the virus effectively hides itself from anti-HIV drugs and the body’s immune response. In most people, new viral particles are constantly being produced from this reservoir. The antiretroviral therapy (ART) it can prevent new viruses from being produced, but cannot remove the reservoir, so daily treatment is necessary to suppress the virus.

Some people, known as elite controllers, have immune systems capable of suppressing HIV without the need for medication. Although they still have viral reservoirs that can produce more HIV virus, a type of immune cell called clula T Killer keeps the virus suppressed without the need for medication.

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Dr. Xu Yu, a member of the Ragon Institute at MGH, MIT, and Harvard, has studied the HIV reservoirs of elite controllers. His research group identified a patient who did not have any intact HIV viral sequences in her genome, indicating that your immune system may have cleared the HIV reservoir, what scientists call a sterilizing cure.

Yu’s team sequenced billions of cells from this patient, known as the San Francisco Patient, looking for any HIV sequences that could be used to create a new virus, and found none. This extraordinary finding, the first known incidence of a sterilizing cure without a stem cell transplant, was published in ‘Nature’ in 2020.

Yu’s group is now reporting a second untreated HIV-infected patient, known as the Hope Patient, which, like the San Francisco Patient, does not have intact HIV genomes found in more than 1.19 billion blood cells and 500 million sequenced tissue cells.

“These findings, especially with the identification of a second case, indicate that there may be a course of action for a sterilizing cure for people who are not able to do it themselves,” says Yu, who is also a research physician at the Hospital General de Massachusetts.

It further explains that these findings may suggest a specific killer T cell response common to both patients that drives this response, with the possibility that other people with HIV have also achieved a sterilizing cure. If researchers can understand the immune mechanisms underlying this response, they could develop treatments that teach other people’s immune systems to mimic these responses in cases of HIV infection.

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Yu explains that they are now studying the possibility of inducing this type of immunity in people on antiretroviral therapy through vaccination, with the aim of educating their immune systems to be able to control the virus without antiretroviral therapy.

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