118a>g and Ivs2+691g>c Polymorphisms of Oprm1 Gene Have No Influence on Cold-pain Sensitivity Among Healthy Opioid-naive Malay Males
Year: 2016
Type: article
Study design: Observational Study
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
Institutions: Universiti Sains Malaysia, Sultan Zainal Abidin University
Language: English
Subfield: Physiology (medical)
Field: Medicine
Domain: Health Sciences
Open Access status: diamond
OpenAlex ID: W2398959385