Panic comorbidity with bipolar disorder: what is the manic-panic connection?

Area of Science:

• Neuroscience
• Psychiatry
• Behavioral Science

Background:

• Bipolar disorder and panic disorder frequently co-occur.
• Both disorders involve episodic dysregulation of affect.
• A shared pathophysiological mechanism may involve amygdala-dependent emotional conditioning deficits.

Purpose of the Study:

• To propose a speculative model linking molecular, cellular, and behavioral aspects of bipolar and panic disorders.
• To explore the role of amygdala-mediated plasticity in emotional conditioning.

Main Methods:

• Review of existing literature on the neurobiology of bipolar and panic disorders.
• Examination of the amygdala's role in neuronal genesis, synaptic remodeling, and plasticity.
• Analysis of molecular factors (serotonin, norepinephrine, BDNF, CRF) involved in emotional conditioning.

Main Results:

• The amygdala and related structures show abnormalities in both disorders.
• Molecular pathways modulating plasticity are implicated in threat and reward conditioning.
• Panic attacks resemble acute fear but lack a relevant threat, while bipolar disorder involves abnormal reward-seeking behavior.

Conclusions:

• A model of amygdala-mediated plasticity deficits offers a framework for understanding these disorders.
• Behavioral interventions may be crucial for bipolar patients with partial medication response.