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Ouabain Reverts CUS-Induced Disruption of the HPA Axis and Avoids Long-Term Spatial Memory Deficits.

Jacqueline Alves Leite1,2, Ana Maria Orellana1, Diana Zukas Andreotti1

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Summary

Ouabain (OUA) treatment reversed chronic stress effects by reducing HPA axis hyperactivity and neuroinflammation. This cardiotonic steroid also improved spatial memory deficits in rats.

Keywords:
CUScorticosteroneextinction fear memorylong-term memoryouabain

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Area of Science:

  • Neuroscience
  • Endocrinology
  • Psychiatry

Background:

  • Ouabain (OUA), a cardiotonic steroid, is an endogenous substance in human plasma linked to stress responses.
  • Chronic stress exacerbates psychiatric disorders like depression and anxiety.
  • The HPA axis and neuroinflammation are key pathways in stress-related disorders.

Purpose of the Study:

  • To investigate the effects of intermittent Ouabain (OUA) administration on the central nervous system (CNS) during chronic unpredictable stress (CUS) in rats.
  • To determine if OUA can modulate HPA axis activity and neuroinflammation induced by CUS.
  • To assess OUA's impact on CUS-induced spatial memory deficits.

Main Methods:

  • Rats were subjected to a chronic unpredictable stress (CUS) protocol.
  • Intermittent administration of Ouabain (OUA) at 1.8 μg/kg was given during the CUS protocol.
  • Measurements included HPA axis hormones (glucocorticoids), CRH-CRHR1 expression, iNOS activity, antioxidant enzyme expression, and spatial memory tests.

Main Results:

  • Intermittent OUA treatment reversed CUS-induced HPA axis hyperactivity.
  • OUA reduced glucocorticoids levels and CRH-CRHR1 expression.
  • OUA decreased neuroinflammation by reducing iNOS activity without affecting antioxidant enzymes, and it reverted CUS-induced spatial memory deficits.

Conclusions:

  • Ouabain (OUA) effectively modulates the HPA axis and reduces neuroinflammation in a rat model of chronic stress.
  • Intermittent OUA administration can reverse stress-induced hyperactivity and spatial memory impairments.
  • OUA shows potential as a therapeutic agent for stress-related psychiatric disorders.