: Medical researchers from Rush University Medical Center, Temple University School of Medicine and the University Of Texas Medical Branch have found that astrocytes, a type of brain cell can harbor HIV and then spread the virus to immune cells that traffic them out of the brain and into other organs.
It was observed that HIV moved from the brain via this route even when the virus was suppressed by combination antiretroviral therapy (cART), a standard treatment for HIV.
The research findings were published in the journal: PLOS Pathogens https://journals.plos.org/plospathogens/article?id=10.1371/journal.ppat.1008381
The study was funded by the National Institutes of Health.
Dr Jeymohan Joseph, Ph.D., Chief of the HIV Neuropathogenesis, Genetics, and Therapeutics Branch at NIH’s National Institute of Mental Health, which co-funded the study told Thailand Medical News, “This study demonstrates the critical role of the brain as a reservoir of HIV that is capable of re-infecting the peripheral organs with the virus “The findings suggest that in order to eradicate HIV from the body, cure strategies must address the role of the central nervous system.”
Typically, HIV attacks the immune system by infecting CD4 positive (CD4+) T cells, a type of white blood cell that is vital to fighting off infection. Without treatment, HIV can destroy CD4+ T cells, reducing the body’s ability to mount an immune response eventually resulting in AIDS.
So far, cART, which effectively suppresses HIV infections, has helped many people with HIV live longer, healthier lives. But some studies have shown that many patients receiving antiretroviral drugs also show signs of HIV-associated neurocognitive disorders, such as thinking and memory problems. Researchers know that HIV enters the brain within eight days of infection, but less is known about whether HIV-infected brain cells can release virus that can migrate from the brain back into the body to infect other tissues.
The human brain contains billions of astrocytes, which perform a variety of tasks, from supporting communication between brain cells to maintaining the blood-brain barrier.
In order to understand whether HIV can move from the brain to peripheral organs, Lena Al-Harthi, Ph.D., and her research team at Rush University Medical Center transplanted HIV-infected or noninfected human astrocytes into the brains of immunodeficient mice.
The medical researchers found that the transplanted HIV-infected astrocytes were able to spread the virus to CD4+ T cells in the brain. These CD4+ T cells then migrated out of the brain and into the rest of the body, spreading the infection to peripheral organs such as the spleen and lymph nodes. They also found that HIV egress from the brain occurred, albeit at lower levels, when animals were given cART. When cART treatment was interrupted, HIV DNA/RNA became detectable in the spleen, indicating a rebound of the viral infection.
Dr Al-Harthi said, “Our study demonstrates that HIV in the brain is not trapped in the brain as it can and does move ba
ck into peripheral organs through leukocyte trafficking. It also shed light on the role of astrocytes in supporting HIV replication in the brain even under cART therapy.”
This new research findings has significant implications for HIV cure strategies, as such strategies need to be able to effectively target and eliminate reservoirs of HIV replication and reinfection.
Dr May Wong, Ph.D., program director for the NeuroAIDS and Infectious Diseases in the Neuroenvironment at the NIH’s National Institute of Neurological Disorders and Stroke, which co-funded the study commented, “HIV remains a major global public health concern, affecting 30 to 40 million people across the globe. To help patients, we need to fully understand how HIV affects the brain and other tissue-based reservoirs. Though additional studies that replicate these findings are needed, this study brings us another step closer towards that understanding.”
The researchers hope that more HIV specialists would be alerted to the findings of this new study.
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