2020年
新規CMOSイオンイメージセンサによる海馬「細胞外」Ca2+イメージング
日本薬理学会年会要旨集
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- 巻
- 93
- 号
- 0
- 開始ページ
- 1
- 終了ページ
- P-126
- 記述言語
- 日本語
- 掲載種別
- DOI
- 10.1254/jpssuppl.93.0_1-P-126
- 出版者・発行元
- 公益社団法人 日本薬理学会
<p>Intracellular calcium ion (Ca2+i) is one of the most important cation that controls several cellular functions, and thus there were already huge number of literature about Ca2+i imaging in various cells. Although it is believed that Ca2+i increase is accompanied by extracellular Ca2+(Ca2+o) decrease, the kinetics of Ca2+o decrease remain unknown because of the limited imaging options. To overcome this limitation, we developed a Ca2+ image sensor (CIS) that is highly selective to Ca2+ but not to other cations within wide dynamic range (from 100 mM to 100 mM). We used CIS for the imaging of Ca2+o in acute hippocampal slices. Stimulation with glutamate (Glu) decreased Ca2+o to around 200 nM within 3 s, which returned to the baseline level (2 mM) with slow kinetics (5 min). Glu stimulates both neurons and glial cells to evoke Ca2+i elevation, thereby reducing Ca2+o. Thus, we tested NMDA to selectively stimulate NMDA receptor in neurons. NMDA mimicked Glu-evoked Ca2+o decrease. Interestingly, Ca2+o decrease was initiated at hippocampal CA1-2, before spreading along the pyramidal layers. Glutamate- and NMDA-evoked Ca2+o decreases were inhibited by a NMDA receptor antagonist D-APV, suggesting involvement of neuronal NMDA receptors in decrease in Ca2+o. So far, many scientists neglected Ca2+o, but the CIS would tell us its importance for understanding brain functions.</p>
- リンク情報
- ID情報
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- DOI : 10.1254/jpssuppl.93.0_1-P-126
- CiNii Articles ID : 130007811280