Interindividual differences in placental expression of the SLC22A2 (OCT2) gene: Relationship to epigenetic variations in the 5'-upstream regulatory region

Jumpei Saito, Takeshi Hirota, Naomi Kikunaga, Kenji Otsubo, Ichiro Ieiri

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Organic cation transporters (OCTs) mediate the transport of organic cations and some drugs (e.g., metformin and cimetidine). OCT1, OCT2, and OCT3 are located in the imprinting cluster of the insulin-like growth factor 2 receptor. It has been reported that OCT1 and OCT3 show a biallelic expression, whereas OCT2 undergoes maternal imprinting in the human placenta; however, a loss of the imprinting of OCT2 has recently been reported in some placental samples. This study investigated whether epigenetic mechanisms are involved in interindividual differences in the placental expression of OCT2. Because OCT2 mRNA levels were higher in biallelic samples than that in monoallelic samples, we compared the DNA methylation and chromatin modifications in the promoter regions. There was no remarkable difference in DNA methylation between the mono allelic samples and biallelic samples. In contrast, histone H3 acetylation (H3Ac) was increased in the biallelic samples. A significant negative correlation was observed between the trimethylation of lysine-9 on histone H3 (H3K9me3) and the OCT2 mRNA levels. Our results suggest that H3Ac plays a role in the allelic expression of OCT2. In addition, H3K9me3 in the OCT2 promoter may explain the interindividual differences in placental OCT2 mRNA levels.

Original languageEnglish
Pages (from-to)3875-3883
Number of pages9
JournalJournal of Pharmaceutical Sciences
Volume100
Issue number9
DOIs
Publication statusPublished - Sep 2011

All Science Journal Classification (ASJC) codes

  • Pharmaceutical Science

Fingerprint Dive into the research topics of 'Interindividual differences in placental expression of the SLC22A2 (OCT2) gene: Relationship to epigenetic variations in the 5'-upstream regulatory region'. Together they form a unique fingerprint.

  • Cite this