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Genetic analysis of NOS isoforms using nNOS and eNOS knockout animals
1Cardiovascular Research Center and Cardiology Division, Massachusetts General Hospital, Boston 02114, USA.
Progress in Brain Research
|February 5, 1999
Summary
Genetic knockout mice reveal distinct roles for nitric oxide synthase (NOS) isoforms in brain function. This approach clarifies the specific functions of neuronal NOS (nNOS) and endothelial NOS (eNOS) in physiological processes.
Area of Science:
- Neuroscience
- Molecular Biology
- Physiology
Background:
- Nitric oxide synthase (NOS) isoforms are expressed in the brain, but their specific roles are unclear due to complex expression patterns.
- Pharmacological studies are limited by overlapping effects and difficulties in isolating isoform-specific functions.
Observation:
- A genetic approach using knockout mice for neuronal NOS (nNOS) and endothelial NOS (eNOS) was employed to circumvent limitations of pharmacological agents.
- This strategy allows for the study of individual NOS isoforms within intact animal models, providing insights into their physiological roles.
Findings:
- Knockout mice for nNOS and eNOS, including double knockouts, have been generated.
- These models have elucidated the roles of NO in regulating cerebral blood flow, response to ischemia, neurotransmitter release, and synaptic plasticity.
Implications:
- Understanding individual NOS isoform functions is crucial for deciphering complex neurological processes.
- These findings pave the way for further research into developmental roles of NO and compensatory mechanisms in the brain.