Abstract
Approximately 25 % of HIV patients use marijuana for its putative therapeutic benefit; however, it is unknown how cannabinoids affect the immune status of HIV patients. Previously, a surrogate in vitro mouse model was established, which induced CD8+ T cell proliferation and gp120-specific IFNγ production. ∆9-Tetrahydrocannabinol (THC), the predominant psychoactive compound in marijuana, suppressed or enhanced the responses depending on the magnitude of cellular activation. The purpose of the current study was to investigate whether THC produced similar effects in vivo and therefore a mouse model to induce HIVgp120-specific immune responses was established. A gp120-expressing plasmid, pVRCgp120, or a vector plasmid, pVRC2000, was injected intramuscularly into mice, which were also dosed with THC orally. The gp120-specific IFNγ and IL-2 responses were detected when splenocytes were restimulated with gp120-derived peptide 81 (IIGDIRQAHCNISRA), which was identified as being immunodominant. Various cellular populations were activated in response to pVRCgp120 stimulation followed by peptide restimulation, as evidenced by increased expression levels of activation markers (e.g., CD69, CD80, and major histocompatibility complex II [MHC II]). The IFNγ response and cellular activation were enhanced by THC in C57Bl/6 wild type (WT) mice but suppressed or not affected by THC in cannabinoid receptor 1 (CB1) and 2 (CB2) knockout (CB1 −/−CB2 −/−) mice. Furthermore, CB1 −/−CB2 −/− mice exhibited augmented IFNγ production when compared to WT mice in the absence of THC. Collectively, our findings demonstrate that under certain conditions, THC enhances HIV antigen-specific immune responses, which occurs through CB1/CB2-dependent and -independent mechanisms.
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Abbreviations
- AC:
-
Adenylyl cyclase
- AP-1:
-
Activator protein-1
- APC:
-
Antigen presenting cell
- BCS:
-
Bovine calf serum
- cAMP:
-
Cyclic adenosine 3′,5′-monophosphate
- CB1 :
-
Cannabinoid receptor 1
- CB2 :
-
Cannabinoid receptor 2
- CB1 −/−CB2 −/− :
-
CB1 and CB2 null
- CO:
-
Corn oil
- CTL:
-
Cytotoxic T lymphocytes
- DC:
-
Dendritic cell
- DMSO:
-
Dimethyl sulfoxide
- FcRs:
-
Fragment cystallizable receptors
- GPCR:
-
G protein-coupled receptor
- i.m.:
-
Intramuscular
- KV :
-
Voltage-gated potassium channels
- MCP-1:
-
Monocyte chemotactic protein-1
- MFI:
-
Mean fluorescence intensity
- NA:
-
Naïve
- NFAT:
-
Nuclear factor of activated T cells
- NF-κB:
-
Nuclear factor kappa-light-chain-enhancer of activated B cells
- NT:
-
No treatment
- PBS:
-
Phosphate buffered saline
- SIV:
-
Simian immunodeficiency virus
- THC:
-
Δ9-tetrahydrocannabinol
- TRP:
-
Transient receptor potential
- VH:
-
Vehicle
- WT:
-
Wild type
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Acknowledgments
The authors thank Jose Suarez and Natalia Kovalova for technical support during the study, and Kimberly Hambleton for assistance with submission of the manuscript.
Funding
This study was funded by National Institutes of Health (grant number DA007908).
Conflict of Interests
The authors declare that they have no conflict of interest.
Authorship Contributions
• W Chen, BLF Kaplan, and NE Kaminski participated in research design
• W Chen and RB Crawford conducted experiments
• W Chen performed data analysis
• W Chen wrote the paper
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Chen, W., Crawford, R.B., Kaplan, B.L.F. et al. Modulation of HIVGP120 Antigen-Specific Immune Responses In Vivo by Δ9-Tetrahydrocannabinol. J Neuroimmune Pharmacol 10, 344–355 (2015). https://doi.org/10.1007/s11481-015-9597-x
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DOI: https://doi.org/10.1007/s11481-015-9597-x