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Lessons learned from nitric oxide synthase knockout animals.

P L Huang1

  • 1Cardiovascular Research Center and Cardiology Division, Massachusetts General Hospital, Boston, USA.

Seminars in Perinatology
|March 10, 2000
PubMed
Summary
This summary is machine-generated.

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Gene targeted mice lacking neuronal and endothelial nitric oxide synthase (NOS) reveal crucial roles for nitric oxide (NO). Neuronal NOS deficiency protects against stroke, while endothelial NOS absence impairs vascular function and cardiac responses.

Area of Science:

  • Physiology
  • Molecular Biology
  • Cardiovascular Research

Background:

  • Nitric oxide (NO) is synthesized by three main nitric oxide synthase (NOS) isoforms.
  • The specific physiological roles of NO, particularly from neuronal NOS (nNOS) and endothelial NOS (eNOS), are complex and not fully elucidated.
  • Gene-targeted knockout mice offer a valuable tool to investigate the in vivo functions of specific NOS isoforms.

Purpose of the Study:

  • To investigate the physiological roles of neuronal nitric oxide synthase (nNOS) and endothelial nitric oxide synthase (eNOS) using gene-targeted knockout mice.
  • To determine the contribution of nNOS to cerebral ischemia and stroke.
  • To elucidate the function of eNOS in vascular regulation, cardiac function, and response to vascular injury.

Main Methods:

Related Experiment Videos

  • Generation and analysis of gene-targeted mice lacking either nNOS or eNOS.
  • Assessment of cerebrovascular responses to global and focal cerebral ischemia.
  • Evaluation of blood pressure, endothelium-dependent relaxation, cardiac function, and neointimal proliferation following vascular injury.

Main Results:

  • Mice lacking nNOS exhibited resistance to both global and focal cerebral ischemia, indicating a role for nNOS in stroke-induced cellular toxicity.
  • Mice lacking eNOS displayed increased susceptibility to stroke, hypertension, and loss of endothelium-dependent relaxing factor activity.
  • eNOS knockout mice showed impaired cardiac function, including blunted responses to beta-adrenergic agonists and altered diastolic relaxation.
  • Absence of eNOS led to increased neointimal proliferation in response to vascular injury, suggesting a role in suppressing smooth muscle cell proliferation.

Conclusions:

  • Neuronal NO plays a detrimental role in the pathophysiology of cerebral ischemia and stroke.
  • Endothelial NO is critical for vascular protective effects, maintaining normal blood pressure, and regulating cardiac function.
  • NO produced by eNOS physiologically suppresses vascular smooth muscle cell proliferation, highlighting its importance in preventing vascular remodeling.