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3,4-Methylenedioxymethamphetamine facilitates fear extinction learning.

M B Young1, R Andero1,2, K J Ressler1,2,3

  • 1Yerkes National Primate Research Center, Emory University, Atlanta, GA, USA.

Translational Psychiatry
|September 16, 2015
PubMed
Summary
This summary is machine-generated.

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3,4-methylenedioxymethamphetamine (MDMA) enhances fear extinction learning, a key process for treating post-traumatic stress disorder (PTSD). This effect is mediated by brain-derived neurotrophic factor (BDNF) signaling in the amygdala.

Area of Science:

  • Neuroscience
  • Psychopharmacology
  • Behavioral Science

Background:

  • 3,4-methylenedioxymethamphetamine (MDMA) shows promise for treating post-traumatic stress disorder (PTSD) when combined with psychotherapy.
  • Preclinical data are lacking to explain the mechanistic basis for MDMA's therapeutic effects on PTSD.
  • Fear extinction learning is crucial for exposure-based therapies and may be a target for MDMA.

Purpose of the Study:

  • To investigate whether MDMA enhances fear extinction learning.
  • To explore the neurobiological mechanisms underlying MDMA's effects on fear extinction.
  • To determine if MDMA could be a valuable adjunct therapy for PTSD and anxiety disorders.

Main Methods:

  • Mice underwent cued fear conditioning, followed by MDMA or vehicle administration before extinction training.

Related Experiment Videos

  • MDMA was administered systemically and directly into the basolateral amygdala (BLA).
  • Behavioral extinction, Fos, and brain-derived neurotrophic factor (Bdnf) mRNA levels were measured.

    • Main Results:

    • MDMA (7.8 mg/kg) significantly enhanced long-term fear extinction.
    • MDMA increased Fos expression in the amygdala and medial prefrontal cortex (mPFC).
    • MDMA increased amygdala Bdnf expression, and this enhancement was BLA-dependent and BDNF signaling-dependent.

    Conclusions:

    • MDMA enhances fear memory extinction via a BDNF-dependent mechanism.
    • MDMA's action involves the amygdala and medial prefrontal cortex.
    • MDMA may serve as an effective adjunct therapy for PTSD and related anxiety disorders.