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Neurotrophins and depression.

C A Altar1

  • 1Mayland Research Laboratories, Otsuka America Pharmaceutical, Rockville 20850, USA.

Trends in Pharmacological Sciences
|April 2, 1999
PubMed
Summary

Brain-derived neurotrophic factor (BDNF) and neurotrophin-3 (NT-3) promote neuron growth and function, potentially offering new antidepressant strategies. Existing depression treatments may work by increasing these neurotrophins, suggesting future drugs could target neurotrophin production.

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Area of Science:

  • Neuroscience
  • Molecular Psychiatry
  • Neurobiology

Background:

  • Neurotrophic factors like BDNF and NT-3 are crucial for neuronal health.
  • Depression is linked to environmental stressors that decrease BDNF mRNA.
  • Existing antidepressants modulate neurotransmitter systems and BDNF levels.

Purpose of the Study:

  • To explore the role of neurotrophic factors in neuronal function and antidepressant effects.
  • To investigate the mechanism by which antidepressants influence BDNF mRNA.
  • To propose neurotrophin-stimulating drugs as a novel antidepressant therapy.

Main Methods:

  • Administration of exogenous BDNF and NT-3 to adult rats.
  • Evaluation of antidepressant effects using learned helplessness paradigms.
  • Analysis of BDNF mRNA levels following environmental stress and antidepressant treatment.

Main Results:

  • Exogenous BDNF/NT-3 enhanced 5-HT neuron function, sprouting, and regrowth.
  • BDNF infusion into the dorsal raphe nucleus showed antidepressant effects.
  • Stress decreased BDNF mRNA, while antidepressants increased it via specific receptor subtypes.

Conclusions:

  • Existing antidepressant treatments may exert effects by increasing endogenous BDNF/NT-3 levels.
  • Increased neurotrophins promote monoamine neuron growth and function.
  • Targeting neurotrophin production offers a promising avenue for developing new antidepressants.

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