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Using Chronic Social Stress to Model Postpartum Depression in Lactating Rodents
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Chronic Stress Decreases Lactation Performance.

Chloe C Josefson1, Lucelia De Moura Pereira1, Amy L Skibiel1

  • 1Department of Animal, Veterinary and Food Sciences, University of Idaho, 875 Perimeter Drive, MS 2330, Moscow, ID 83844, USA.

Integrative and Comparative Biology
|May 30, 2023
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Summary
This summary is machine-generated.

Chronic stress during lactation in rats significantly reduced milk yield and quality, lowering lipid content and energy density. This maternal stress impacts lactation performance without altering key milk synthesis gene expression in mammary tissue.

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Area of Science:

  • Reproductive Biology
  • Stress Physiology
  • Mammalian Lactation

Background:

  • Lactation is a critical maternal investment, demanding significant energetic and nutritional resources.
  • Mammalian mothers face increased physiological demands during lactation, making them vulnerable to stressors.
  • Chronic stress can disrupt essential physiological processes, potentially impacting maternal care and offspring development.

Purpose of the Study:

  • To investigate the impact of chronic stress on maternal lactation performance in Sprague-Dawley rats.
  • To assess changes in milk quality (proximate composition, energy density) and quantity under chronic stress.
  • To examine the effect of chronic stress on the expression of key milk synthesis genes in mammary tissue.

Main Methods:

  • Chronic stress was induced in postpartum Sprague-Dawley rats using a novel male intruder paradigm for 10 consecutive days.
  • Milk yield was measured, and milk samples were analyzed for proximate components (lipid, lactose, protein) and energy density.
  • Gene expression of key milk synthesis genes in mammary tissue was assessed in stressed versus control rats.

Main Results:

  • Chronically stressed rats exhibited significantly lower milk yields compared to control rats.
  • Milk from stressed mothers showed decreased lipid concentration and lower energy density.
  • Protein and lactose concentrations in milk, as well as mammary gland expression of key milk synthesis genes, were not significantly affected by chronic stress.

Conclusions:

  • Chronic stress during lactation impairs maternal lactation performance, specifically reducing milk quantity and fat content.
  • These findings suggest that maternal stress can negatively impact offspring nutrition through reduced milk quality and yield.
  • Despite impacts on milk production, chronic stress did not alter the expression of key milk synthesis genes in the mammary gland.