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Related Experiment Videos

Reduced serotonin type 1A receptor binding in panic disorder.

Alexander Neumeister1, Earle Bain, Allison C Nugent

  • 1National Institutes of Health, National Institute of Mental Health, Mood and Anxiety Disorders Program, Bethesda, Maryland 20892-2670, USA. neumeisa@intra.nimh.nih.gov

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|January 23, 2004
PubMed
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This study investigated serotonin type-1A receptor (5-HT(1A)R) binding in panic disorder (PD) patients. Lower receptor availability was observed in PD patients, suggesting a role for 5-HT(1A)Rs in the disorder.

Area of Science:

  • Neuroscience
  • Psychiatry
  • Radiology

Background:

  • Animal models suggest serotonin type-1A receptor (5-HT(1A)R) dysfunction in chronic anxiety.
  • The relevance of these models for human panic disorder (PD) remains unclear.
  • In vivo assessment of central 5-HT(1A)R binding is crucial for understanding PD pathophysiology.

Purpose of the Study:

  • To investigate the in vivo binding of central serotonin type-1A receptors (5-HT(1A)R) in unmedicated patients with panic disorder (PD).
  • To determine if 5-HT(1A)R availability differs between PD patients and healthy controls.
  • To explore the impact of comorbid depression on 5-HT(1A)R binding in PD.

Main Methods:

  • Utilized positron emission tomography (PET) with the selective 5-HT(1A)R radioligand [18F]trans-4-fluoro-N-2-[4-(2-methoxyphenyl)piperazin-1-yl]ethyl]-N-(2-pyridyl)cyclohexanecarboxamide (FCWAY).

Related Experiment Videos

  • Studied 16 unmedicated symptomatic outpatients with PD (7 with comorbid depression) and 15 matched healthy controls.
  • Acquired 120-minute PET scans and MRI for anatomical reference and partial volume correction, analyzing [18F]-FCWAY volume of distribution (DV) and delivery rate (K1).

    • Main Results:

    • PD patients exhibited significantly lower [18F]-FCWAY volume of distribution (DV) in the anterior cingulate, posterior cingulate, and raphe regions compared to healthy controls.
    • No significant difference in DV was found between PD patients with and without comorbid depression.
    • Both PD patient groups showed significantly lower DV than healthy controls, indicating reduced 5-HT(1A)R availability.

    Conclusions:

    • Provides the first in vivo evidence for the involvement of serotonin type-1A receptors (5-HT(1A)R) in the pathophysiology of panic disorder (PD).
    • Reduced central 5-HT(1A)R availability is a potential neurobiological marker for PD.
    • Comorbid depression does not appear to significantly alter 5-HT(1A)R availability in PD patients.