Abstract
Previously, CD8+ T cells were found to be a sensitive target for suppression by Δ9-tetrahydrocannabinol (Δ9-THC) in a murine model of influenza infection. To study the effect of Δ9-THC on CD8+ cytotoxic T lymphocytes (CTL), an allogeneic model of MHC I mismatch was used to elicit CTL. In addition, to determine the requirement for the cannabinoid receptors 1 (CB1) and 2 (CB2) in Δ9-THC-mediated CTL response modulation, mice null for both receptors were used (CB1 −/−CB2 −/−). Δ9-THC suppressed CTL function independent of CB1 and CB2 as evidenced by reduction of 51Cr release by CTL generated from CB1 −/−CB2 −/− mice. Furthermore, viability in CD4+ and CD8+ cells was reduced in a concentration-dependent manner with Δ9-THC, independent of CB1 and CB2, but no effect of Δ9-THC on proliferation was observed, suggesting that Δ9-THC decreases the number of T cells initially activated. Δ9-THC increased expression of the activation markers, CD69 in CD8+ cells and CD25 in CD4+ cells in a concentration-dependent manner in cells derived from WT and CB1 −/−CB2 −/− mice. Furthermore, Δ9-THC synergized with the calcium ionophore, ionomycin, to increase CD69 expression on both CD4+ and CD8+ cells. In addition, without stimulation, Δ9-THC increased CD69 expression in CD8+ cells from CB1 −/−CB2 −/− and WT mice. Overall, these results suggest that CB1 and CB2 are dispensable for Δ9-THC-mediated suppression and that perturbation of Ca2+ signals during T cell activation plays an important role in the mechanism by which Δ9-THC suppresses CTL function.
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Acknowledgements
The authors would like to thank Mr. Robert Crawford for excellent technical assistance with flow cytometer and Mrs. Kimberly Hambleton for assistance with submission of the manuscript.
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Support: NIH Grants RO1DA12740 and RO1DA07908
Δ9-tetrahydrocannabinol was provided by NIDA
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Karmaus, P.W.F., Chen, W., Kaplan, B.L.F. et al. Δ9-Tetrahydrocannabinol Suppresses Cytotoxic T Lymphocyte Function Independent of CB1 and CB2, Disrupting Early Activation Events. J Neuroimmune Pharmacol 7, 843–855 (2012). https://doi.org/10.1007/s11481-011-9293-4
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DOI: https://doi.org/10.1007/s11481-011-9293-4