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Stress and mental health issues can decrease tear secretion, contributing to dry eye disease (DED). Brain-derived neurotrophic factor (BDNF) plays a key role in tear production and stress resilience in DED.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Stress Physiology

Background:

  • Dry eye disease (DED) is a growing public health concern with reported links to mental disorders.
  • Stressors are hypothesized to impair tear secretion, impacting DED pathogenesis.
  • Understanding the mechanisms of stress-induced DED is crucial for developing effective interventions.

Purpose of the Study:

  • To investigate the relationship between stress loading and decreased tear secretion.
  • To establish and utilize a stress-induced DED mouse model to explore underlying mechanisms.
  • To determine the role of brain-derived neurotrophic factor (BDNF) in regulating tear secretion under stress.

Main Methods:

  • Establishment of a stress-induced dry eye disease mouse model.
  • Administration of enriched environment (EE) as an intervention.
  • Assessment of brain-derived neurotrophic factor (BDNF) expression levels.
  • Evaluation of tear secretion in wild-type and Bdnf gene knockdown mice under various conditions.

Main Results:

  • Stress loading led to decreased tear secretion and reduced BDNF expression.
  • Enriched environment (EE) intervention effectively prevented and alleviated stress-induced decreased tear secretion.
  • Bdnf knockdown mice exhibited reduced basal tear secretion and impaired stress tolerance, even with EE.
  • BDNF expression was found to correlate with tear secretion regulation and DED pathology.

Conclusions:

  • Stress significantly impacts tear secretion, potentially contributing to dry eye disease.
  • Brain-derived neurotrophic factor (BDNF) is a critical regulator of basal tear secretion and stress resilience.
  • Targeting BDNF pathways may offer therapeutic potential for managing stress-related dry eye disease.