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BDNF pro-peptide: physiological mechanisms and implications for depression.

Masami Kojima1,2, Konomi Matsui3,4, Toshiyuki Mizui3

  • 1Biomedical Research Institute (BMD), National Institute of Advanced Industrial Science and Technology (AIST), Osaka, 563-8577, Japan. m-kojima@aist.go.

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Summary

The brain-derived neurotrophic factor (BDNF) pro-peptide acts as a novel synaptic modulator, influencing long-term depression. Lower levels in cerebrospinal fluid are linked to major depressive disorder (MDD), especially in males.

Keywords:
BDNF pro-peptideLong-term depressionMajor depressive disorderProteolytic processingSynaptic modulator

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Psychiatry

Background:

  • Growth factors often require proteolytic cleavage for activation, but the roles of their pro-domains remain largely unknown.
  • Brain-derived neurotrophic factor (BDNF) is crucial for neuronal function, but its pro-domain's specific functions are emerging.
  • Pro-domains are generally considered inactive precursors, yet recent findings suggest active roles.

Purpose of the Study:

  • To investigate the novel synaptic functions of the BDNF pro-peptide.
  • To explore the regulatory mechanism between BDNF and its pro-peptide.
  • To determine the association of BDNF pro-peptide levels with major depressive disorder (MDD).

Main Methods:

  • Localization studies of BDNF pro-peptide at presynaptic termini.
  • Electrophysiological recordings in hippocampal slices to assess long-term depression (LTD) facilitation.
  • Analysis of BDNF pro-peptide levels in human cerebrospinal fluid (CSF) from MDD patients and controls.

Main Results:

  • The BDNF pro-peptide was found to localize at presynaptic sites and facilitate hippocampal LTD.
  • BDNF binding to its pro-peptide, a pH-dependent interaction, inhibits the pro-peptide's ability to facilitate LTD.
  • Significantly lower CSF BDNF pro-peptide levels were observed in MDD patients compared to controls, with males showing lower levels than females.

Conclusions:

  • The BDNF pro-peptide is a functional synaptic modulator with a distinct biological role.
  • The interaction between BDNF and its pro-peptide represents a novel regulatory mechanism for synaptic plasticity.
  • Reduced BDNF pro-peptide levels in CSF are associated with MDD, particularly in males, suggesting potential diagnostic or etiological relevance.