Macrophage cellular phenotype

Macrophage cellular phenotype refers to the diverse functional states that macrophages adopt in response to microenvironmental cues, a process known as polarization (PMID: 25870903). Traditionally categorized into the classically activated M1 (pro-inflammatory/anti-tumor) and alternatively activated M2 (anti-inflammatory/pro-tumor) phenotypes, these cells play critical roles in orchestrating immune responses and maintaining tissue homeostasis (PMID: 30541260). In many diseases, such as cancer, macrophages are often subverted into a pro-tumoral M2-like state, which promotes angiogenesis and suppresses T-cell activity (PMID: 28263170). Therapeutic strategies aim to reprogram or repolarize these cells to restore their anti-tumor or anti-inflammatory functions using agents like CSF1R inhibitors or TLR agonists (PMID: 31092192). Because this entry describes a complex cellular state rather than a single protein or receptor, it is classified as a phenotypic target rather than a canonical molecular target (PMID: 24561250).

Other names

Macrophage polarizationM1/M2 activationMacrophage functional stateTumor-associated macrophage (TAM) phenotype

Modulation of macrophage polarization from a pro-tumoral or anti-inflammatory state (M2) to a pro-inflammatory or anti-tumoral state (M1), or vice versa, through signaling pathway inhibition or activation.