Papers

International journal
Oct, 2023

Ethnicity-dependent effect of rs1799971 polymorphism on OPRM1 expression in the postmortem brain and responsiveness to antipsychotics.

Journal of psychiatric research
  • Kazusa Miyahara
  • ,
  • Mizuki Hino
  • ,
  • Risa Shishido
  • ,
  • Ryuta Izumi
  • ,
  • Atsuko Nagaoka
  • ,
  • Hideki Hayashi
  • ,
  • Akiyoshi Kakita
  • ,
  • Hirooki Yabe
  • ,
  • Hiroaki Tomita
  • ,
  • Yasuto Kunii

Volume
166
Number
First page
10
Last page
16
Language
English
Publishing type
Research paper (scientific journal)
DOI
10.1016/j.jpsychires.2023.08.007

Schizophrenia is associated with aberration of inhibitory neurons. Although the mu-opioid receptor (MOR) is an essential modulator of inhibitory neurons, the effect of rs1799971 polymorphism in the MOR gene on risk of schizophrenia is controversial. Moreover, the disturbance of opioids systems in patients with schizophrenia has not been fully examined. We firstly conducted preliminary meta-analyses integrating Asian and European populations separately over 12,000 subjects to assess the effect of rs1799971 on risk of schizophrenia. Based on the above result, we also investigated the effect on the expression levels of MOR mRNA in the prefrontal cortex (PFC) and caudate nucleus of 41 postmortem brains. In addition, we determined whether these levels were related to antemortem schizophrenia symptoms and pharmacotherapeutic effects. The rs1799971 G-allele reduced the risk of schizophrenia in Asian populations (OR: 0.56, 95%CI: 0.32-0.98, p = 0.042) but increased it in European populations (OR: 1.66, 95%CI: 1.08-2.56, p = 0.022). It decreased MOR mRNA levels in PFC in the Japanese population (p = 0.031). Increased MOR mRNA level in PFC correlated with higher total score of antemortem schizophrenia symptoms (p = 0.017). Furthermore, the pharmacotherapeutic effect of first-generation antipsychotics was higher for genotype AA than AG/GG of rs1799971 (p = 0.036). The rs1799971 affects risk of schizophrenia and MOR mRNA expression and the effect varies according to ethnicity. Overexpression of MOR might induce severe schizophrenia symptoms. Therefore, MOR modulation may be the key clue for treating antipsychotics-resistant schizophrenia, and genotyping rs1799971 may provide a better pharmacotherapeutic strategy.

Link information
DOI
https://doi.org/10.1016/j.jpsychires.2023.08.007
PubMed
https://www.ncbi.nlm.nih.gov/pubmed/37659266
ID information
  • DOI : 10.1016/j.jpsychires.2023.08.007
  • Pubmed ID : 37659266

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