Inhibitory action of antidepressants on mouse betaine/GABA transporter (BGT1) heterologously expressed in cell cultures

Gerile, Chiharu Sogawa, Kazumi Ohyama, Takashi Masuko, Tadashi Kusama, Katsuya Morita, Norio Sogawa, Shigeo Kitayama

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Betaine/γ-aminobutyric acid (GABA) transporter (BGT1, SLC6A12) is a member of the Na +- and Cl -dependent neurotransmitter transporter gene family with a homology to the GABA transporters (GATs), GAT1 (SLC6A1), GAT2 (SLC6A13) and GAT3 (SLC6A11) (HUGO nomenclature). Since antidepressants have been reported to inhibit GABA uptake, we examined those effects on mouse BGT1 (mBGT1) in comparison with other mouse GAT (mGAT) subtypes in the heterologously expressed cell cultures. All antidepressants tested here inhibited the [ 3H]GABA uptake through mBGT1 and mGATs in a rank order of potency with mBGT1 > mGAT1-3. Kinetic analyses for maprotilline, mianserine and trimipramine revealed that they inhibited mBGT1 and mGAT1 noncompetitively, except that mianserine competitively inhibited mBGT1. These results provided a clue to investigate the structure-function relationship of mBGT1 using antidepressants as a tool, leading to the identification of potential candidates for selective and specific inhibitors of mBGT1.

Original languageEnglish
Pages (from-to)2578-2589
Number of pages12
JournalInternational Journal of Molecular Sciences
Issue number3
Publication statusPublished - Mar 2012



  • Antidepressant
  • Betaine
  • GABA
  • Transporter
  • Uptake inhibitor

ASJC Scopus subject areas

  • Computer Science Applications
  • Molecular Biology
  • Catalysis
  • Inorganic Chemistry
  • Spectroscopy
  • Organic Chemistry
  • Physical and Theoretical Chemistry
  • Medicine(all)

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