The significant correlations observed between GABA and neuroinflammatory biomarkers (MMP-2, MMP-9, and NLRP3) in the Past PTSD (>5 y) group, alongside markedly reduced GABA levels in both PTSD groups compared to controls, indicate a dynamic relationship between heightened neuroinflammation and GABAergic impairment (Section 2.3, Figure 4; Section 2.1, Table 1). This evidence concerns the gene MMP2 and post-traumatic stress disorder.