Macrophage polarization via IFN-γ and IL-4 signaling

Macrophage polarization via IFN-γ and IL-4 signaling refers to the complex biological process where macrophages adopt distinct functional states—classically activated (M1) or alternatively activated (M2)—in response to their microenvironment (Murray, 2017). Interferon-gamma (IFN-γ) signaling, primarily through the JAK1/JAK2-STAT1 pathway, drives the M1 phenotype, which is characterized by the production of pro-inflammatory cytokines and reactive oxygen species to combat pathogens (Wang et al., 2014). In contrast, Interleukin-4 (IL-4) signaling through the IL-4Rα and the JAK1/JAK3-STAT6 pathway induces the M2 phenotype, which supports tissue repair, remodeling, and the resolution of inflammation (StatPearls, 2023). Dysregulation of this polarization is a hallmark of various pathologies; for instance, M1-skewed responses are associated with autoimmune diseases like rheumatoid arthritis, while M2-skewed tumor-associated macrophages (TAMs) often promote cancer progression and immunosuppression (Nature Reviews Immunology, 2017). Pharmacological intervention targets these pathways using agents such as JAK inhibitors (e.g., Tofacitinib) or monoclonal antibodies (e.g., Dupilumab) to reprogram macrophage activity for therapeutic benefit. However, modulating these pathways carries risks, including increased susceptibility to infections or unintended promotion of fibrosis and tumor growth depending on the direction of the shift.

Other names

M1/M2 macrophage polarizationClassical and alternative macrophage activationMacrophage activation

Modulation of the JAK-STAT signaling axis to alter the transcriptional profile of macrophages, shifting them between pro-inflammatory M1 and anti-inflammatory M2 states.