Abstract：
:Studying the behavioral phenotypes of transgenic and gene knockout mice is a powerful means to better understand the pathophysiology of neuropsychiatric disorders and ultimately improve their treatment. This paper provides an overview of the methods and findings of studies that have tested for anxiety-related behavioral phenotypes in gene mutant mice. In the context of improving the side effect burden of benzodiazepines, gene targeting has been valuable for dissociating the functional roles (i.e., anxiolytic, sedative, amnestic) of individual GABA(A) receptor subunits. Supporting the link between abnormalities in CRH function and anxiety, CRH overexpressing transgenic mice and CRH-R2 receptor knockout mutants have displayed significantly increased anxiety-like behavior, while CRH-R1 receptor knockout mice have shown an anxiolytic-like phenotype. Consistent with an important role for the serotonergic system in anxiety, 5-HT1(A) receptor deficient mice have consistently exhibited heightened anxiety-like behavior, while the evidence from 5-HT1(B) and 5-HT2(C) deficient mice remains somewhat equivocal. Mutant mice lacking either of the monoamine degrading enzymes, MAOA or COMT, have shown a number of behavioral and neurological effects, including alterations in anxiety-like behavior. With enhanced spatial and temporal control over gene mutations, in combination with an improved battery of behavioral tests, gene mutant mice will provide an increasingly valuable tool for understanding the neural substrates of anxiety.
journal_name
Neurosci Biobehav Revjournal_title
Neuroscience and biobehavioral reviewsauthors
Holmes Adoi
10.1016/s0149-7634(01)00012-4subject
Has Abstractpub_date
2001-05-01 00:00:00pages
261-73issue
3eissn
0149-7634issn
1873-7528pii
S0149-7634(01)00012-4journal_volume
25pub_type
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