Inflammatory signaling and macrophage polarization pathways

Inflammatory signaling and macrophage polarization pathways represent the complex regulatory networks that govern the functional plasticity of macrophages in response to microenvironmental cues. Macrophages typically polarize into two broad phenotypes: the M1 (classically activated) state, which is pro-inflammatory and microbicidal, and the M2 (alternatively activated) state, which is involved in anti-inflammatory responses and tissue repair [1][2]. These transitions are mediated by key signaling cascades, including the NF-κB, MAPK, and JAK-STAT pathways, which integrate signals from Toll-like receptors (TLRs) and cytokine receptors [3][4]. Dysregulation of these pathways is a hallmark of various pathologies, including chronic inflammatory diseases, atherosclerosis, and cancer, where tumor-associated macrophages (TAMs) often adopt an M2-like phenotype to promote immune evasion [5]. Therapeutic strategies aim to modulate these pathways using biologics or small molecules to either suppress excessive M1-mediated inflammation or re-polarize M2-like TAMs toward an anti-tumor M1 phenotype [6].

Other names

Macrophage M1/M2 polarizationMacrophage activation pathwaysInflammatory signaling cascadesMonocyte-macrophage differentiation

Modulation of macrophage phenotypes through the inhibition or activation of specific signaling nodes such as NF-κB, JAK-STAT, and MAPK pathways to shift the balance from pro-inflammatory (M1) to anti-inflammatory (M2) states.