The Korean Journal of Physiology and Pharmacology

The Korean Society of Pharmacology (대한약리학회)
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Effects of Serotonin on the Induction of Long-term Depression in the Rat Visual Cortex

  • Jang, Hyun-Jong (Department of Physiology, College of Medicine, The Catholic University of Korea) ;
  • Cho, Kwang-Hyun (Department of Physiology, College of Medicine, The Catholic University of Korea) ;
  • Park, Sung-Won (Department of Physiology, College of Medicine, The Catholic University of Korea) ;
  • Kim, Myung-Jun (Department of Physiology, College of Medicine, The Catholic University of Korea) ;
  • Yoon, Shin-Hee (Department of Physiology, College of Medicine, The Catholic University of Korea) ;
  • Rhie, Duck-Joo (Department of Physiology, College of Medicine, The Catholic University of Korea)
  • Received : 2010.09.30
  • Accepted : 2010.10.18
  • Published : 2010.10.31
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Abstract

Long-term potentiation (LTP) and long-term depression (LTD) have both been studied as mechanisms of ocular dominance plasticity in the rat visual cortex. In a previous study, we suggested that a developmental increase in serotonin [5-hydroxytryptamine (5-HT)] might be involved in the decline of LTP, since 5-HT inhibited its induction. In the present study, to further understand the role of 5-HT in a developmental decrease in plasticity, we investigated the effect of 5-HT on the induction of LTD in the pathway from layer 4 to layer 2/3. LTD was inhibited by 5-HT ($10{\mu}M$) in 5-week-old rats. The inhibitory effect was mediated by activation of 5-$HT_2$ receptors. Since 5-HT also regulates the development of visual cortical circuits, we also investigated the role of 5-HT on the development of inhibition. The development of inhibition was retarded by chronic (2 weeks) depletion of endogenous 5-HT in 5-week-old rats, in which LTD was reinstated. These results suggest that 5-HT regulates the induction of LTD directly via activation of 5-$HT_2$ receptors and indirectly by regulating cortical development. Thus, the present study provides significant insight into the roles of 5-HT on the development of visual cortical circuits and on the age-dependent decline of long-term synaptic plasticity.

Keywords

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