118A>G AND IVS2+691G>C POLYMORPHISMS OF OPRM1 GENE HAVE NO INFLUENCE ON COLD-PAIN SENSITIVITY AMONG HEALTHY OPIOID-NAIVE MALAY MALES
Journal Title: International Journal of Pharmacy and Pharmaceutical Sciences - Year 2016, Vol 8, Issue 7
Abstract
Objective: Common polymorphisms of the mu-type opioid receptor (OPRM1) including 118A>G and IVS2+691G>C may affect experimental pain responses in healthy subjects, and the effect could be ethnic-dependent. The aim of this study was to investigate the influence of these OPRM1 polymorphisms on cold-pressor pain responses among healthy opioid-naive Malay males. Methods: Pain-threshold, pain-tolerance, and pain-intensity in response to the cold pressor test (CPT) were measured in healthy opioid-naive Malay males. DNA was extracted from the collected venous blood before PCR-genotyping. Repeated measure analysis of variance (RM-ANOVA) was used to compare CPT responses and OPRM1 polymorphisms (118A>G and IVS2+691G>C) according to their genotypes and allelic additive models, genotype dominant and recessive models, haplotypes, and diplotypes.Results: A total of 152 participants were recruited. Both 118A>G and IVS2+691G>C polymorphisms were not associated with cold-pressor pain-threshold, pain-tolerance and pain-intensity despite using genotypes and allelic additive models and genotype dominant and recessive models (all p>0.05). Likewise, there were no significant associations between haplotypes and diplotypes for the 118A>G and IVS2+691G>C polymorphisms and the three cold-pain responses (all p>0.05). Conclusion: The common OPRM1 polymorphisms (i.e., 118A>G and IVS2+691G>C), are not associated with cold-pressor pain responses in healthy opioid-naive Malay males. However, this may be unique for this particular ethnicity. Other polymorphisms may be more relevant for this population, and this should be further investigated.Keywords: Cold pressor test (CPT), Mu-type opioid receptor (OPRM1), Opioid receptor, mu 1 gene (OPRM1), Pain-threshold, Pain-tolerance, Pain-intensity, Opioid-naive, Male, Malays
Authors and Affiliations
Zalina Zahari, Lee Chee Siong, Lee Yeong Yeh, Muslih Abdulkarim Ibrahim, Nurfadhlina Musa, Md Azhar Mohd Yasin, Tan Soo Choon, Nasir Mohamad, Rusli Ismail
Keywords
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