Iron–inflammation framework proposed to explain PTSD treatment non-response

A commentary in The British Journal of Psychiatry proposes an iron–inflammation framework for understanding why some patients with post-traumatic stress disorder (PTSD) do not respond to trauma-focused cognitive–behavioural therapy (TF-CBT). The authors link previously identified treatment-predictive prefrontal–limbic circuitry to potentially modifiable biological processes. The article presents no new patient cohort or treatment outcomes.

The authors cite an approximately 40% non-response rate to evidence-based PTSD care and a meta-analysis of 114 studies reporting limited success with TF-CBT augmentation. Their proposed mechanism involves a reinforcing cycle in which excess iron promotes oxidative stress and microglial activation, while inflammation promotes further iron accumulation. Animal studies associate chronic stress with iron accumulation in the hippocampus and prefrontal cortex; the authors hypothesise that these processes could impair plasticity supporting fear extinction learning.

Quantitative susceptibility mapping and proton magnetic resonance spectroscopy are proposed as complementary methods for investigating brain iron and glial metabolites associated with inflammation. Such measurements might eventually support biological stratification for adjunctive treatment trials. However, much of the supporting evidence comes from animal models or peripheral biomarkers, and the framework has not established a causal mechanism of human PTSD treatment resistance. It does not provide a validated imaging-based treatment-selection strategy or evidence supporting routine iron-targeted or anti-inflammatory adjuncts.