Macrophage chemotaxis

Macrophage chemotaxis is the physiological process of directed macrophage or monocyte movement toward a chemical gradient, a mechanism essential for mounting an effective innate immune response (PubMed: 28414285). This migration is typically orchestrated by the interaction of chemokines, such as monocyte chemoattractant protein-1 (MCP-1/CCL2), with their corresponding receptors, primarily C-C chemokine receptor type 2 (CCR2) (NCBI: NBK507855). In various disease states, particularly solid tumors, this process is hijacked to recruit tumor-associated macrophages (TAMs), which facilitate an immunosuppressive microenvironment, promote angiogenesis, and drive metastasis (Nature: s41416-019-0482-3). While 'Macrophage chemotaxis' describes a complex cellular behavior rather than a single molecular target, therapeutic intervention focuses on specific proteins within this pathway. Drugs like Pexidartinib (a CSF1R inhibitor) and experimental CCR2 antagonists like CCX140 seek to halt this recruitment to treat chronic inflammatory conditions and enhance the efficacy of cancer therapies (DrugBank: DB11641). Because macrophages are critical for pathogen clearance and tissue repair, pharmacological inhibition of their chemotaxis carries inherent risks such as increased susceptibility to infection and delayed wound healing.

Other names

Monocyte chemotaxisMacrophage migrationMonocyte recruitmentDirected macrophage migration

Modulation of macrophage recruitment via the pharmacological inhibition of chemotactic signaling axes, most notably the CCL2-CCR2 and CSF1-CSF1R pathways.