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La Porte

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Sunday Apr 18, 2010

Apr 18, 2010
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Delta-9 tetrahydrocannabinol (THC) inhibits lytic replication of gamma oncogenic herpesviruses in vitro

Maria M Medveczky , Tracy A Sherwood , Thomas W Klein , Herman Friedman and Peter G Medveczky

BMC Medicine 2004, 2:34 doi:10.1186/1741-7015-2-34

Published 15 September 2004

Abstract (provisional)


The major psychoactive cannabinoid compound of marijuana delta-9 tetrahydrocannabinol (THC) has been shown to modulate immune responses and lymphocyte function. After primary infection the viral DNA genome of gamma herpesviruses persists in nuclei of lymphoid cells in a latent episomal circular form. In response to extracellular signals, the latent virus can be activated, which leads to production of infectious virus progeny. Therefore, we evaluated potential effects of THC on gamma herpesvirus replication.

Methods
Tissue cultures infected with various gamma herpesviruses were cultured in the presence of increasing concentrations of THC and the amount of viral DNA or infectious virus yield was compared to those of control cultures. The effect of THC on Kaposi's Sarcoma Associated Herpesvirus (KSHV) and Epstein-Barr virus (EBV) replication was measured by the Gardella method and replication of herpesvirus saimiri (HVS) of monkeys, murine gamma herpesvirus 68 (MHV 68), and herpes simplex type 1 (HSV-1) was measured by yield reduction assays. Inhibition of the immediate early ORF 50 gene promoter activity was measured by the dual luciferase method.
Results
Data presented in this work show that micro molar concentrations of THC inhibit KSHV and EBV reactivation in virus infected/immortalized B cells. THC also strongly inhibits lytic replication of MHV 68 and HVS in vitro. Importantly, concentrations of THC that inhibit virus replication of gamma herpesviruses had no effect on cell growth or HSV-1 replication indicating selectivity. THC was shown to selectively inhibit the immediate early ORF 50 gene promoter of KSHV and MHV 68.

Conclusions
THC specifically targets viral and/or cellular mechanisms required for replication and possibly shared by these gamma herpesviruses, and the endocannabinoid system is possibly involved in regulating gamma herpesvirus latency and lytic replication. The immediate early gene ORF 50 promoter activity was specifically inhibited by THC. These studies may also provide the foundation for the development of antiviral strategies utilizing non-psychoactive derivatives of THC.


Reference Address: http://hempevolution.org/study/gamma_herpes_virus.htm
violentpatriot:
happy 4/20! skull
Apr 19, 2010

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