Neuroinflammation, Stress-Related Suicidal Ideation, and Negative Mood in Depression
Sarah Herzog1,2, Elizabeth A Bartlett1,2, Francesca Zanderigo1,2
1Molecular Imaging and Neuropathology Area, New York State Psychiatric Institute, New York.
JAMA Psychiatry
|November 6, 2024
Summary
Translocator protein 18k Da (TSPO) binding, a marker of neuroinflammation, may indicate vulnerability to stress-induced suicidal ideation in depression. Further research is needed to confirm this link and explore neuroinflammation-targeted treatments.
Area of Science:
- Neuroscience
- Psychiatry
- Medical Imaging
Background:
- Translocator protein 18k Da (TSPO) binding is a potential marker for neuroinflammation, often observed in depressed and suicidal populations.
- The role of neuroinflammation in moderating the relationship between daily stress and suicidal ideation remains unclear.
Purpose of the Study:
- To investigate the association between TSPO binding in individuals with depression and their experiences of stress-related suicidal ideation, negative affect, and history of suicidal behavior.
- To correlate TSPO binding with clinician-rated suicidal ideation severity.
Main Methods:
- Positron emission tomography (PET) imaging with 11C-ER176 was used to measure TSPO binding in 53 adults with major depressive disorder.
- Suicidal ideation was assessed using the Beck Scale for Suicidal Ideation (BSS) and ecological momentary assessment (EMA).
- A subset of 21 participants completed EMA for 7 days, reporting daily on suicidal ideation, negative affect, and stressors.
Main Results:
- TSPO binding showed a trend-level association with clinician-rated suicidal ideation severity (P=.09) and did not differ by suicide attempt history (P=.11).
- Exploratory analyses revealed that the presence of suicidal ideation was associated with higher TSPO binding (P=.045).
- In the EMA subset, higher TSPO binding correlated with increased suicidal ideation (P=.03) and negative affect (P<.001) during periods with stressors.
Conclusions:
- TSPO binding in depression may signify a vulnerability to stress-induced increases in suicidal ideation and negative affect.
- Further research is required to establish causality and explore neuroinflammation-targeted interventions for enhancing stress resilience in depression.
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