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Clin Rheumatol. 2018 Nov;37(11):2933-2938. doi: 10.1007/s10067-018-4217-9. Epub 2018 Jul 21.

Study of cannabinoid receptor 2 Q63R gene polymorphism in Lebanese patients with rheumatoid arthritis.

Author information

1
Department of Biological Sciences, Faculty of Science, Beirut Arab University, Debbieh, Lebanon.
2
Department of Biological Sciences, Faculty of Science, Beirut Arab University, Debbieh, Lebanon. G.khawaja@bau.edu.lb.

Abstract

The cannabinoid (CB) receptor 2, primarily expressed in immune cells, was shown to play important immune-regulatory functions. In particular, the CB2-R63 functional variant has been shown to alter the ability of the CB2 receptor to exert its inhibitory function on T lymphocytes. The aim of this study was to investigate the association between a common dinucleotide polymorphism, Q63R, in the cannabinoid receptor 2 gene (CNR2) and rheumatoid arthritis (RA) in the Lebanese population. One hundred five unrelated Lebanese RA patients and one hundred five controls from different Lebanese governorates were recruited in this study. Genomic DNA was extracted, polymerase chain reaction was performed, and CNR2 was genotyped in a blinded fashion. The χ2 test was used to determine the differences in genotypes and allele frequencies. CNR2 genotyping showed significantly higher frequencies of the CB2-R63 variant (allele frequencies, P < 0.00001; genotype distribution, P < 0.00001) in RA patients when compared with healthy controls. Moreover, RR carriers had more than 10-fold risk for developing RA (OR = 10.8444, 95% CI = 5.0950-23.0818; P < 0.0001), and QR carriers had more than 3-fold risk (OR = 3.8667, 95% CI = 1.7886-8.3591; P = 0.0006) as compared with QQ carriers. Our preliminary results suggest a role of CB2-Q63R gene polymorphism in the etiology of RA, thus supporting its potential use as a pharmacological target for selective agonists in clinical practice.

KEYWORDS:

CB2-Q63R gene polymorphism; Cannabinoid receptor 2; Rheumatoid arthritis

PMID:
30032418
DOI:
10.1007/s10067-018-4217-9

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