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2016 ; 13
(1
): 136
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Pathways and gene networks mediating the regulatory effects of cannabidiol, a
nonpsychoactive cannabinoid, in autoimmune T cells
#MMPMID27256343
Kozela E
; Juknat A
; Gao F
; Kaushansky N
; Coppola G
; Vogel Z
J Neuroinflammation
2016[Jun]; 13
(1
): 136
PMID27256343
show ga
BACKGROUND: Our previous studies showed that the non-psychoactive cannabinoid,
cannabidiol (CBD), ameliorates the clinical symptoms in mouse myelin
oligodendrocyte glycoprotein (MOG)35-55-induced experimental autoimmune
encephalomyelitis model of multiple sclerosis (MS) as well as decreases the
memory MOG35-55-specific T cell (TMOG) proliferation and cytokine secretion
including IL-17, a key autoimmune factor. The mechanisms of these activities are
currently poorly understood. METHODS: Herein, using microarray-based gene
expression profiling, we describe gene networks and intracellular pathways
involved in CBD-induced suppression of these activated memory TMOG cells.
Encephalitogenic TMOG cells were stimulated with MOG35-55 in the presence of
spleen-derived antigen presenting cells (APC) with or without CBD. mRNA of
purified TMOG was then subjected to Illumina microarray analysis followed by
ingenuity pathway analysis (IPA), weighted gene co-expression network analysis
(WGCNA) and gene ontology (GO) elucidation of gene interactions. Results were
validated using qPCR and ELISA assays. RESULTS: Gene profiling showed that the
CBD treatment suppresses the transcription of a large number of proinflammatory
genes in activated TMOG. These include cytokines (Xcl1, Il3, Il12a, Il1b),
cytokine receptors (Cxcr1, Ifngr1), transcription factors (Ier3, Atf3, Nr4a3,
Crem), and TNF superfamily signaling molecules (Tnfsf11, Tnfsf14, Tnfrsf9,
Tnfrsf18). "IL-17 differentiation" and "IL-6 and IL-10-signaling" were identified
among the top processes affected by CBD. CBD increases a number of IFN-dependent
transcripts (Rgs16, Mx2, Rsad2, Irf4, Ifit2, Ephx1, Ets2) known to execute
anti-proliferative activities in T cells. Interestingly, certain MOG35-55
up-regulated transcripts were maintained at high levels in the presence of CBD,
including transcription factors (Egr2, Egr1, Tbx21), cytokines (Csf2, Tnf, Ifng),
and chemokines (Ccl3, Ccl4, Cxcl10) suggesting that CBD may promote exhaustion of
memory TMOG cells. In addition, CBD enhanced the transcription of T cell
co-inhibitory molecules (Btla, Lag3, Trat1, and CD69) known to interfere with
T/APC interactions. Furthermore, CBD enhanced the transcription of oxidative
stress modulators with potent anti-inflammatory activity that are controlled by
Nfe2l2/Nrf2 (Mt1, Mt2a, Slc30a1, Hmox1). CONCLUSIONS: Microarray-based gene
expression profiling demonstrated that CBD exerts its immunoregulatory effects in
activated memory TMOG cells via (a) suppressing proinflammatory Th17-related
transcription, (b) by promoting T cell exhaustion/tolerance, (c) enhancing
IFN-dependent anti-proliferative program, (d) hampering antigen presentation, and
(d) inducing antioxidant milieu resolving inflammation. These findings put
forward mechanism by which CBD exerts its anti-inflammatory effects as well as
explain the beneficial role of CBD in pathological memory T cells and in
autoimmune diseases.