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Temple scientists weaken HIV infection in immune cells using synthetic agents
Date:5/1/2013

(Philadelphia, PA) HIV, the virus that causes AIDS, is notorious for hiding within certain types of cells, where it reproduces at a slowed rate and eventually gives rise to chronic inflammation, despite drug therapy. But researchers at Temple University School of Medicine's Department of Pathology and Laboratory Medicine and Center for Substance Abuse Research (CSAR) recently discovered that synthetic anti-inflammatory substances distantly related to the active ingredient of marijuana may be able to take the punch out of HIV while inside one of its major hideouts immune cells known as macrophages.

The breakthrough comes at a crucial time in the HIV/AIDS pandemic. "Powerful antiretroviral drug cocktails have allowed many HIV patients to live longer," explained Servio H. Ramirez, PhD, Assistant Professor of Pathology and Laboratory Medicine at Temple University School of Medicine (TUSM), and first author on the study. But living longer with HIV means extended exposure to low levels of HIV replication and associated inflammation. In the central nervous system (CNS), this inflammatory process is thought to be the underlying cause of HIV-associated neurocognitive disorder (HAND), a spectrum of conditions that is on the rise again after more than a decade of decline following the advent of antiretroviral therapy.

To better understand the connection between inflammation and neurocognitive conditions linked to long-term exposure to HIV, Ramirez and colleagues looked specifically at the CB2 receptor, a protein located on the surface of macrophages. CB2 is a binding site for substances called cannabinoids, the primary active compounds of cannabis (marijuana), and it may play a role in blocking inflammation in the CNS. Unlike its counterpart, the CB1 receptor, which is found primarily on neurons in the brain, CB2 does not mediate the psychoactive effects for which cannabis is popularly known.

Ramirez explained that there has
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Contact: Jeremy Walter
Jeremy.Walter@tuhs.temple.edu
215-707-7882
Temple University Health System
Source:Eurekalert

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