Molecular Mechanisms of Inflammation and Their Role in the Development of Chronic Diseases: A Narrative Review

Abstract

Inflammation is a fundamental and protective biological response, yet when it becomes chronic and unresolved it emerges as a central driver in the pathogenesis of many of the most burdensome human diseases. The molecular machinery governing the inflammatory response, when persistently activated, contributes to progressive tissue injury and organ dysfunction. This narrative review comprehensively examines the molecular mechanisms of inflammation and clarifies how these mechanisms participate in the development of chronic diseases. The cellular sensing of danger through pattern recognition receptors, the activation of the nuclear factor-κB (NF-κB) signalling pathway, the assembly of the NLRP3 inflammasome, and the resulting production of pro-inflammatory cytokines and lipid mediators are described in an integrated manner. The distinction between self-limiting acute inflammation and persistent low-grade chronic inflammation is emphasized, since the failure of resolution is now recognized as a key pathological event. The review further details how these molecular processes converge on the pathogenesis of atherosclerosis and cardiovascular disease, type 2 diabetes and metabolic dysfunction, cancer, neurodegenerative disorders, and autoimmune conditions. The role of specialized pro-resolving mediators and the therapeutic opportunities arising from targeting inflammatory pathways are also considered. By synthesizing current mechanistic understanding with its clinical consequences, this review provides both a conceptual framework and a practical reference for researchers and clinicians. In sum, the work positions chronic inflammation as a unifying mechanism across diverse diseases and underscores the value of resolution-based and pathway-specific strategies for prevention and treatment.