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Journal of Neuroinflammation

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Open Access 01-12-2015 | Research

Cannabidiol, a non-psychoactive cannabinoid, leads to EGR2-dependent anergy in activated encephalitogenic T cells

Authors: Ewa Kozela, Ana Juknat, Nathali Kaushansky, Avraham Ben-Nun, Giovanni Coppola, Zvi Vogel

Published in: Journal of Neuroinflammation | Issue 1/2015

Abstract

Background

Cannabidiol (CBD), the main non-psychoactive cannabinoid, has been previously shown by us to ameliorate clinical symptoms and to decrease inflammation in myelin oligodendrocyte glycoprotein (MOG)35-55-induced mouse experimental autoimmune encephalomyelitis model of multiple sclerosis as well as to decrease MOG35-55-induced T cell proliferation and IL-17 secretion. However, the mechanisms of CBD anti-inflammatory activities are unclear.

Methods

Here we analyzed the effects of CBD on splenocytes (source of accessory T cells and antigen presenting cells (APC)) co-cultured with MOG35-55-specific T cells (T_MOG) and stimulated with MOG35-55. Using flow cytometry, we evaluated the expression of surface activation markers and inhibitory molecules on T cells and B cells. T_MOG cells were purified using CD4 positive microbead selection and submitted for quantitative PCR and microarray of mRNA transcript analyzes. Cell signaling studies in purified T_MOG were carried out using immunoblotting.

Results

We found that CBD leads to upregulation of CD69 and lymphocyte-activation gene 3 (LAG3) regulatory molecules on CD4⁺CD25⁻ accessory T cells. This subtype of CD4⁺CD25⁻CD69⁺LAG3⁺ T cells has been recognized as induced regulatory phenotype promoting anergy in activated T cells. Indeed, we observed that CBD treatment results in upregulation of EGR2 (a key T cell anergy inducer) mRNA transcription in stimulated T_MOG cells. This was accompanied by elevated levels of anergy promoting genes such as IL-10 (anti-inflammatory cytokine), STAT5 (regulatory factor), and LAG3 mRNAs, as well as of several enhancers of cell cycle arrest (such as Nfatc1, Casp4, Cdkn1a, and Icos). Moreover, CBD exposure leads to a decrease in STAT3 and to an increase in STAT5 phosphorylation in T_MOG cells, positive and negative regulators of Th17 activity, respectively. In parallel, we observed decreased levels of major histocompatibility complex class II (MHCII), CD25, and CD69 on CD19⁺ B cells following CBD treatment, showing diminished antigen presenting capabilities of B cells and reduction in their pro-inflammatory functions.

Conclusions

Our data suggests that CBD exerts its immunoregulatory effects via induction of CD4⁺CD25⁻CD69⁺LAG3⁺ cells in MOG35-55-activated APC/T_MOG co-cultures. This is accompanied by EGR2-dependent anergy of stimulated T_MOG cells as well as a switch in their intracellular STAT3/STAT5 activation balance leading to the previously observed decrease in Th17 activity.

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Title: Cannabidiol, a non-psychoactive cannabinoid, leads to EGR2-dependent anergy in activated encephalitogenic T cells
Authors: Ewa Kozela
Ana Juknat
Nathali Kaushansky
Avraham Ben-Nun
Giovanni Coppola
Zvi Vogel
Publication date: 01-12-2015
Publisher: BioMed Central
Published in: Journal of Neuroinflammation / Issue 1/2015
Electronic ISSN: 1742-2094
DOI: https://doi.org/10.1186/s12974-015-0273-0

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Cannabidiol, a non-psychoactive cannabinoid, leads to EGR2-dependent anergy in activated encephalitogenic T cells

Abstract

Background

Methods

Results

Conclusions

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Abstract

Background

Methods

Results

Conclusions

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