Inhibitory Action of Antidepressants on Mouse Betaine/GABA Transporter (BGT1) Heterologously Expressed in Cell Cultures

International Journal of Molecular Sciences

rib-type="author">Gerile12  Chiharu Sogawa²  Kazumi Ohyama¹  Takashi Masuko⁴  Tadashi Kusama⁴  Katsuya Morita³  Norio Sogawa² 

[1] RI Research Center, Okayama University Dental School, Okayama 700-8525, Japan; E-Mail:;Department of Dental Pharmacology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8525, Japan; E-Mails:;Department of Dental Pharmacology, Hiroshima University Graduate School of Biomedical Sciences, Hiroshima 734-8553, Japan; E-Mail:;Laboratory of Physiology and Anatomy, College of Pharmacy, Nihon University, Funabashi 274-8555, Japan; E-Mails:

关键词: betaine;    GABA;    transporter;    antidepressant;    uptake inhibitor;   

DOI  :  10.3390/ijms13032578

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2012 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.