In this study, we assessed serum levels of MMP-2, MMP-9, the NLRP3 inflammasome, and GABA in a male population divided into three groups: individuals with Past PTSD resolved within the last 5 years (Past PTSD ≤ 5 y), those with PTSD resolved over 5 years ago (Past PTSD > 5 y), and a control group with no history of PTSD (No PTSD). This evidence concerns the gene MMP9 and post-traumatic stress disorder.