BA11 FKBP5 expression levels correlate with dendritic spine density in postmortem PTSD and controls

Area of Science:

• Neuroscience
• Genetics
• Psychiatry

Background:

• Genetic variants in FKBP5 are associated with post-traumatic stress disorder (PTSD) and stress-related disorders.
• Neuronal morphology, specifically dendritic spine density, is altered in PTSD.

Purpose of the Study:

• To investigate the relationship between FKBP5 gene expression and dendritic spine densities in the medial orbitofrontal cortex (BA11) in individuals with PTSD.
• To explore the potential role of FKBP5 in the cellular mechanisms underlying PTSD-related brain changes.

Main Methods:

• Golgi staining was used to measure mushroom, stubby, thin, and filopodial spine densities in the medial orbitofrontal cortex (BA11) of individuals with PTSD and controls.
• FKBP5 mRNA levels were quantified and correlated with spine densities using statistical analyses (ANCOVA, Spearman correlation).

Main Results:

• PTSD cases exhibited a significant increase in stubby spine density and a trend towards reduced mushroom spine density.
• FKBP5 mRNA levels were marginally elevated in PTSD cases and showed significant correlations with spine densities, inversely with mushroom and overall density, and directly with stubby density.

Conclusions:

• FKBP5 may be involved in a cellular pathway that modulates neuronal spine density.
• This FKBP5-associated pathway appears to be dysregulated in individuals with PTSD, contributing to observed structural brain changes.