Even with antiretroviral therapy, HIV still lingers in the body, preventing complete cure. Now, new research published in PLOS Pathogens, revealed a possible answer to why HIV persists in the body: a lack of a certain protein in HIV patients’ killer T cells. The discovery also explained why people with HIV have less risk of developing multiple sclerosis (MS).
Because this protein, CD73 is responsible for migration and cell movement into the tissue, the lack of the protein compromises the ability of killer T cells to find and eliminate HIV-infected cells, explained immunologist Shokrollah Elahi, lead researcher of the study.
“This mechanism explains one potential reason for why HIV stays in human tissues forever,” he said, adding that the research also shows the complexity of HIV infection.
“This provides us the opportunity to come up with potential new treatments that would help killer T cells migrate better to gain access to the infected cells in different tissues.”
After spending three years identifying the role of CD73, Elahi turned his focus to understanding potential causes for the drastic reduction. He found it is partly due to the chronic inflammation that is common among people living with HIV.
“Following extensive studies, we discovered that chronic inflammation results in increased levels of a type of RNA found in cells and in blood, called microRNAs,” he explained. “These are very small types of RNA that can bind to messenger RNAs to block them from making CD73 protein. We found this was causing the CD73 gene to be suppressed.”
This discovery also helps explain why people with HIV have a lower risk of developing MS, Elahi noted.
“Our findings suggest that reduced or eliminated CD73 can be beneficial in HIV-infected individuals to protect them against MS. Therefore, targeting CD73 could be a novel potential therapeutic marker for MS patients.”
Elahi said the research could next look into seeing how to turn on the CD73 gene in patients with HIV and off in those with MS.
Source: University of Alberta
