Involvement of NMDAR2A tyrosine phosphorylation in depression-related behaviour.
Major depressive and bipolar disorders are serious illnesses that affect millions of people. Growing evidence implicates glutamate signalling in depression, though the molecular mechanism by which glutamate signalling regulates depression-related behaviour remains unknown. In this study, we provide evidence suggesting that tyrosine phosphorylation of the NMDA receptor, an ionotropic glutamate receptor, contributes to depression-related behaviour. The NR2A subunit of the NMDA receptor is tyrosine-phosphorylated, with Tyr 1325 as its one of the major phosphorylation site. We have generated mice expressing mutant NR2A with a Tyr-1325-Phe mutation to prevent the phosphorylation of this site in vivo. The homozygous knock-in mice show antidepressant-like behaviour in the tail suspension test and in the forced swim test. In the striatum of the knock-in mice, DARPP-32 phosphorylation at Thr 34, which is important for the regulation of depression-related behaviour, is increased. We also show that the Tyr 1325 phosphorylation site is required for Src-induced potentiation of the NMDA receptor channel in the striatum. These data argue that Tyr 1325 phosphorylation regulates NMDA receptor channel properties and the NMDA receptor-mediated downstream signalling to modulate depression-related behaviour.
Taniguchi
Sachiko
S
Division of Oncology, Institute of Medical Science, University of Tokyo, Minato-ku, Tokyo, Japan.
Nakazawa
Takanobu
T
Tanimura
Asami
A
Kiyama
Yuji
Y
Tezuka
Tohru
T
Watabe
Ayako M
AM
Katayama
Norikazu
N
Yokoyama
Kazumasa
K
Inoue
Takeshi
T
Izumi-Nakaseko
Hiroko
H
Kakuta
Shigeru
S
Sudo
Katsuko
K
Iwakura
Yoichiro
Y
Umemori
Hisashi
H
Inoue
Takafumi
T
Murphy
Niall P
NP
Hashimoto
Kouichi
K
Kano
Masanobu
M
Manabe
Toshiya
T
Yamamoto
Tadashi
T
D000818:Animals; D002460:Cell Line; D003863:Depression / Q000235:genetics / Q000378:metabolism* / Q000503:physiopathology* / Q000523:psychology; D004195:Disease Models, Animal; D015536:Down-Regulation / Q000235:genetics; D055879:Gene Knock-In Techniques; D006801:Humans; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D010649:Phenylalanine / Q000235:genetics; D010766:Phosphorylation / Q000235:genetics; D016194:Receptors, N-Methyl-D-Aspartate / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D015398:Signal Transduction / Q000235:genetics; D014443:Tyrosine / Q000235:genetics / Q000502:physiology*
D010649:Phenylalanine; D016194:Receptors, N-Methyl-D-Aspartate; D014443:Tyrosine