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Elevated plasma nitrate levels in depressive states.

E Suzuki1, G Yagi, T Nakaki

  • 1Department of Neuropsychiatry, Keio University School of Medicine, 35 Shinanomachi, Shinjuku Ward, Tokyo 160-8582, Japan. e-suzuki@med.keio.ac.jp

Journal of Affective Disorders
|March 14, 2001
PubMed
Summary
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This study found elevated nitric oxide (NO) production in depressed patients compared to controls. These findings suggest a link between increased NO and the pathophysiology of depression.

Area of Science:

  • Neuroscience
  • Biochemistry

Background:

  • Nitric oxide (NO) synthase inhibitors exhibit preclinical antidepressant properties.
  • Evidence suggests NO involvement in depression pathogenesis.

Purpose of the Study:

  • To investigate if nitric oxide (NO) production is elevated in patients diagnosed with depression.

Main Methods:

  • Plasma nitrate levels, a marker for NO production, were quantified using high-performance liquid chromatography.
  • Measurements were taken from 17 depressed patients, 6 patients with anxiety disorders, and 12 healthy controls.

Main Results:

  • Depressed patients exhibited significantly higher plasma nitrate concentrations compared to both anxiety patients (P<0.05) and healthy controls (P<0.01).

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Conclusions:

  • This research indicates that nitric oxide (NO) production is increased in individuals experiencing depression.
  • The precise origin of elevated NO in major depressive episodes requires further investigation.