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Depressive Disorders: Etiology01:27

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Related Experiment Video

Updated: May 15, 2025

Animal Models of Depression - Chronic Despair Model CDM
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Correlation between persistent changes in ciliary dynamics in the FrA and depressive-like behavior.

Rintaro Takahashi1, Akie Hamamoto1, Yumiko Saito1

  • 1Graduate School of Integrated Sciences for Life, Hiroshima University, Hiroshima, 739-8521, Japan.

Biochemical and Biophysical Research Communications
|April 9, 2025
PubMed
Summary

Neuronal primary cilia regulate stress-induced depression. Chronic stress alters cilia in the frontal cortex, leading to persistent depressive behaviors, suggesting a novel therapeutic target for treatment-resistant depression.

Keywords:
DepressionMelanin-concentrating hormonePrimary ciliaStress

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Behavioral Science

Background:

  • Long-term stress is a significant risk factor for depressive disorders.
  • Current monoamine-based depression treatments are not always effective.
  • Neuronal primary cilia's role in stress response and depression is largely unexplored.

Purpose of the Study:

  • To investigate the role of neuronal primary cilia in the frontal association cortex (FrA) in stress-induced depressive-like behavior.
  • To explore the impact of short-term versus long-term stress on ciliary dynamics and behavior.
  • To identify potential molecular mechanisms, such as MCH-MCHR1 signaling, involved in stress-induced ciliary changes.

Main Methods:

  • Utilized a mouse model to induce short-term (3 days) and long-term (3 weeks) restraint stress.
  • Assessed changes in primary cilia length and prevalence in the FrA using microscopy.
  • Evaluated depressive-like behaviors and recovery over different periods (2 weeks, 10 weeks).
  • Investigated the expression and role of melanin-concentrating hormone receptor 1 (MCHR1) and melanin-concentrating hormone (MCH) in FrA brain slices.

Main Results:

  • Short-term stress transiently reduced FrA cilia length and prevalence, with recovery after 2 weeks and no lasting depressive behavior.
  • Long-term stress induced persistent shortening and reduced prevalence of FrA cilia, correlating with sustained depressive-like behavior.
  • Ciliary structure and depressive behaviors eventually normalized after a 10-week recovery period following long-term stress.
  • Melanin-concentrating hormone (MCH) signaling via MCHR1 was identified as a mediator of stress-induced ciliary changes.

Conclusions:

  • Neuronal primary cilia dynamics in the FrA are critical determinants of behavioral outcomes following stress.
  • Persistent alterations in ciliary structure, potentially mediated by MCH-MCHR1 signaling, may underlie chronic depressive disorders.
  • The non-synaptic signaling of primary cilia presents a promising novel therapeutic target for depression, particularly treatment-resistant forms.