Gamma-aminobutyric acid: Difference between revisions
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{{Image|GABA synthesis degradation DEVolk.jpg|right|450px|Synthesis and degradation of GABA.}} | {{Image|GABA synthesis degradation DEVolk.jpg|right|450px|Synthesis and degradation of GABA.}} | ||
'''Gamma aminobutyric acid''' (GABA) or <math>\gamma</math>-aminobutyrate, is | '''Gamma aminobutyric acid''' (GABA) or <math>\gamma</math>-aminobutyrate, is the major inhibitory [[neurotransmitter]] in the [[central nervous system]].<ref name="isbn0-07-145153-6">{{cite book |author=Katzung, Bertram G. |title=Basic and clinical pharmacology |publisher=McGraw-Hill Medical Publishing Division |location=New York |year=2006 |pages= |isbn=0-07-145153-6 |oclc= |doi=}}</ref> GABA is produced from the [[amino acid]] glutamate through the action of the enzyme [[glutamate decarboxylase]], and is inactivated by degradation to [[succinate]] in a two step mechanism involving the enzymes [[GABA-glutamate transaminase]] and [[succinate semialdehyde dehydrogenase]]. | ||
==Role in clinical pharmacology== | ==Role in clinical pharmacology== | ||
===Gamma-aminobutyric acid (GABA) agonists=== | ===Gamma-aminobutyric acid (GABA) agonists=== | ||
Drugs that increase the effect of GABA are called GABAergic. | |||
Many sedatives work by increasing receptiveness of GABA<sub>A</sub> receptors. | Many sedatives work by increasing receptiveness of GABA<sub>A</sub> receptors. | ||
Revision as of 22:31, 14 September 2009
Gamma aminobutyric acid (GABA) or -aminobutyrate, is the major inhibitory neurotransmitter in the central nervous system.[1] GABA is produced from the amino acid glutamate through the action of the enzyme glutamate decarboxylase, and is inactivated by degradation to succinate in a two step mechanism involving the enzymes GABA-glutamate transaminase and succinate semialdehyde dehydrogenase.
Role in clinical pharmacology
Gamma-aminobutyric acid (GABA) agonists
Drugs that increase the effect of GABA are called GABAergic.
Many sedatives work by increasing receptiveness of GABAA receptors.
Barbituates
Barbituates are GABAergic by increasing receptiveness of the GABAA receptors. Barbituates do this by increasing the duration of openings of channels in the cell membrane.[1]
- Phenobarbital
Benzodiazepines
Benzodiazepines are also GABAergic by increasing receptiveness of the GABAA receptors. However, benzodiazepines do this by increasing the frequency of openings of channels in the cell membrane.[1]
Benzodiazepine receptors are BZ1 and BZ2.
Non-selective agonists
BZ1 selective agonists
References
- ↑ 1.0 1.1 1.2 Katzung, Bertram G. (2006). Basic and clinical pharmacology. New York: McGraw-Hill Medical Publishing Division. ISBN 0-07-145153-6.