Role of taurine in osmoregulation in brain cells: Mechanisms and functional implications
Amino Acids, ISSN: 0939-4451, Vol: 12, Issue: 3-4, Page: 281-292
1997
- 79Citations
- 16Captures
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Review Description
All cells including neurons and glial cells are able to keep their volume within a very limited range. The volume regulatory mechanism involves changes in the concentration of osmolytes of which taurine appears to be of particular importance in brain cells. Swelling in brain cells may occur as a result of depolarization or small fluctuations in osmolarity. In isolated brain cells these conditions will always lead to a release of taurine, the time course of which is superimposable on that of the volume regulatory decrease which follows the initial cell swelling. The mechanism responsible for taurine release associated with swelling has not been fully elucidated but a large body of evidence seems to exclude participation of the taurine high affinity carrier. Using a number of inhibitors of anion exchangers it has been demonstrated that both volume regulation and taurine release in brain cells are inhibited by these drugs, implicating an anion channel in the process. It has been a controversial issue as to whether or not taurine release is Ca dependent. Recent evidence appears to suggest that the release process is not associated with Ca or Ca channels. It is, however, quite possible that the swelling process may involve the Ca calmodulin system or other second messengers. Taurine also contributes to volume regulation after shrinkage of brain cells, in this case by increasing its intracellular concentration. This change is accomplished by an upregulation of the Na/taurine cotransporter, together with reduced passive fluxes and increased endogenous synthesis.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0030824778&origin=inward; http://dx.doi.org/10.1007/bf01373008; http://link.springer.com/10.1007/BF01373008; http://link.springer.com/content/pdf/10.1007/BF01373008; http://link.springer.com/content/pdf/10.1007/BF01373008.pdf; http://link.springer.com/article/10.1007/BF01373008/fulltext.html; http://www.springerlink.com/index/10.1007/BF01373008; http://www.springerlink.com/index/pdf/10.1007/BF01373008; https://dx.doi.org/10.1007/bf01373008; https://link.springer.com/article/10.1007/BF01373008
Springer Science and Business Media LLC
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