A Novel Effect of Bifemelane, a Nootropic Drug, on Intracellular Ca2+ Levels in Rat Cerebral Astrocytes
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- Yoshida Yoshitoku
- School of Life Science, Tokyo University of Pharmacy and Life Science, Japan
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- Nakane Akira
- School of Life Science, Tokyo University of Pharmacy and Life Science, Japan
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- Morita Mitsuhiro
- School of Life Science, Tokyo University of Pharmacy and Life Science, Japan
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- Kudo Yoshihisa
- School of Life Science, Tokyo University of Pharmacy and Life Science, Japan
Bibliographic Information
- Other Title
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- A Novel Effect of Bifemelane, a Nootropic Drug, on Intracellular Ca〔2+〕 Levels in Rat Cerebral Astrocytes
- Novel Effect of Bifemelane a Nootropic Drug on Intracellular Ca 2 Levels in Rat Cerebral Astrocytes
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Abstract
We investigated the effects of bifemelane, a nootropic drug, on the intracellular calcium concentration ([Ca2+]i) in rat cerebral astrocytes using a Ca2+ imaging device. At concentrations of 10 – 30 μM, bifemelane induced a slow onset and small increase in the [Ca2+]i, while at higher concentrations (100 – 300 μM), it induced a rapid transient increase in the [Ca2+]i during administration and a second large increase was seen during drug washout. The first peak was observed in Ca2+-free medium, but its onset was significantly delayed, and no second peak was seen. Neither of these effects was seen in cells treated with thapsigargin, a specific inhibitor of endoplasmic reticulum Ca2+-ATPase, in Ca2+-free medium. When thapsigargin-treated astrocytes were returned to normal medium containing Ca2+ (1.8 mM), the [Ca2+]i increased significantly, and this effect was reversely inhibited by bifemelane. We conclude that bifemelane causes the first peak by stimulating release from intracellular Ca2+ stores and the second by capacitive entry through store–operated Ca2+ channels. Although the detail mechanisms of action of the drug are still unknown, bifemelane will be provided as a pharmacological tool for basic studies on astrocytes.<br>
Journal
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- Journal of Pharmacological Sciences
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Journal of Pharmacological Sciences 100 (2), 126-132, 2006
The Japanese Pharmacological Society
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Details 詳細情報について
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- CRID
- 1390001205177571840
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- NII Article ID
- 10018240701
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- NII Book ID
- AA11806667
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- ISSN
- 13478648
- 13478613
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- NDL BIB ID
- 7821831
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed