Arachidonic acid metabolism in spinal cord injury.

A wide spectrum of conditions, including neuropathic pain, complex regional pain syndrome (CRPS), migraines, and fibromyalgia, are well-recognized contributors to chronic pain. CRPS is a chronic pain disorder characterized by spontaneous and evoked regional pain that is disproportionate to the expected path of pain after a similar trauma. This article explores the current understanding of CRPS pathophysiology, diagnosis, and treatment, while also examining future perspectives and emerging therapeutic strategies. CRPS manifests itself not only as pain, but also through motor and sensory alterations, including muscle atrophy, reduced mobility, edema, and changes in skin color in the affected region. The underlying pathophysiological mechanisms include musculoskeletal dysfunction, peripheral and central sensitization, autonomic dysregulation, sympathoafferent coupling, changes in the receptor population (e.g., up-regulation of the adrenergic receptor and decreased cutaneous nerve fibers), neuroplastic alterations, genetic predispositions, psychological factors, inflammation, and immune-mediated systemic and regional sympathetic disturbances. Autophagy is a genetically regulated process in eukaryotic cells that mediates the degradation of cytoplasmic proteins and dysfunctional organelles through the lysosomal pathway, thereby preserving cellular homeostasis. The interactions among neurons, microglia, and astrocytes are critically involved in the pathophysiology of migraine. Nevertheless, the therapeutic implications of modulating autophagy for the prevention and management of migraine have not been adequately investigated. Emerging evidence has highlighted hyperbaric oxygen therapy (HBOT) as a potential intervention influencing autophagy. Based on preliminary research, HBOT may regulate mitophagy and relieve pain by mediating Ca/calmodulin-dependent protein kinase kinase beta/AMP-activated protein kinase signaling pathway in the neuropatic pain model. This autophagy-related intervention has yielded notable clinical benefits, and further research into the potential applications of autophagy modulators in the context of migraine and neuropathic pain management.