• Jun Aoki, Masakazu Hayashida, Megumi Tagami, Makoto Nagashima, Ken-ichi Fukuda, Daisuke Nishizawa, Yasukazu Ogai, Shinya Kasai, Kazutaka Ikeda, and Kazuhiko Iwahashi.
• Laboratory of Neurophysiology, Graduate School of Environmental Health Sciences, Azabu University, Kanagawa, Japan.
• Neurosci. Lett. 2010 Jul 19;479(1):40-3.

AbstractAlthough the serotonin (5-hydroxytryptamine (5-HT)) 2A receptor has been reported to be associated with pain, no relationship has been found between single nucleotide polymorphisms in the 5-HT2A receptor gene and analgesic requirements. To clarify the mechanism of individual differences in analgesic requirements, we investigated the relationship between the 5-HT2A 102T/C gene polymorphism and analgesic requirements in 135 patients who underwent major open abdominal surgery and were managed with continuous epidural analgesia with opioids after surgery. Genotyping was performed using polymerase chain reaction-restriction fragment length polymorphism. We found that the 102T/C polymorphism had significant main effects with regard to analgesic requirements. In addition, significant interaction effects were found between the 102T/C polymorphism and sex in terms of analgesic requirements. Among female subjects, patients with the T/T genotype of the 102T/C polymorphism had more analgesic requirements than those with the other genotypes. This finding suggests that the linkage disequilibrium block, which includes the 102T/C polymorphism of the 5-HT2A receptor gene, is involved in individual differences in analgesic requirements in women.Copyright 2010 Elsevier Ireland Ltd. All rights reserved.

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