Macrophage Migration Inhibitory Factor in Immune Regulation

Macrophage Migration Inhibitory Factor (MIF) is a multifunctional cytokine first characterised by its ability to restrain macrophage motility but now recognised as a central regulator of both innate and adaptive immunity. It counteracts the anti-inflammatory actions of glucocorticoids, sustains mitogen-activated protein kinase and phosphoinositide-3-kinase signalling, and controls cell survival pathways. MIF engages cell surface receptors, notably CD74 often in complex with CD44, to initiate downstream cascades that promote cytokine production and cell activation. Intracellularly, its tautomerase active site contributes to non-enzymatic roles such as regulation of inflammasome assembly and modulation of autophagic processes. Through these mechanisms MIF influences host defence, inflammation resolution, tissue repair and, in chronic settings, contributes to pathologies ranging from sepsis and autoimmune disorders to tumour immune evasion. Understanding its dualistic roles offers avenues for targeted therapies that fine-tune immune responses while minimising collateral tissue damage.

Research from Nature Portfolio

Recent investigations have revealed that MIF is indispensable for activation of the NLRP3 inflammasome, a cytosolic complex responsible for maturation of interleukin-1 family cytokines. Mechanistically, MIF directly interacts with both NLRP3 and the intermediate filament protein vimentin, facilitating their association and enabling efficient inflammasome assembly without altering cytokine gene transcription. Inhibition of MIF disrupts this scaffolding function, attenuating release of IL-1β and IL-18 and thereby demonstrating that MIF operates as a non-redundant regulator of early innate inflammatory responses. This work has established a new paradigm in which a classical cytokine can act intracellularly to orchestrate multiprotein sensing platforms and suggests that targeting MIF-mediated inflammasome activation may ameliorate excessive inflammation in sepsis and autoinflammatory syndromes.

Macrophage Migration Inhibitory Factor in Immune Regulation publication trend

The graph below shows the total number of articles in macrophage migration inhibitory factor in immune regulation across all publications each year (not limited to Nature Index journals).

Technical terms

Macrophage Migration Inhibitory Factor (MIF): A pleiotropic cytokine that modulates immune cell activation, counter-regulates glucocorticoids, and supports inflammatory signalling.

CD74 receptor: A cell surface protein that binds MIF and, in association with CD44, initiates intracellular signalling cascades.

NLRP3 inflammasome: A multiprotein cytosolic complex that activates caspase-1, leading to maturation and secretion of IL-1β and IL-18.

Mitophagy: The selective autophagic clearance of damaged mitochondria, mediated by the PINK1-Parkin pathway, essential for cellular homeostasis under stress.

Microglia polarisation (M1/M2): Functional states of brain-resident macrophages, where M1 denotes a pro-inflammatory, cytotoxic profile and M2 an anti-inflammatory, repair-oriented phenotype.

References

1. Macrophage migration inhibitory factor is required for NLRP3 inflammasome activation. Nature Communications (2018).
2. Blocking the MIF-CD74 axis augments radiotherapy efficacy for brain metastasis in NSCLC via synergistically promoting microglia M1 polarization. Journal of Experimental & Clinical Cancer Research (2024).
3. Macrophage migration inhibitory factor (MIF) suppresses mitophagy through disturbing the protein interaction of PINK1-Parkin in sepsis-associated acute kidney injury. Cell Death & Disease (2024).
4. MIF contribution to progressive brain diseases. Journal of Neuroinflammation (2024).
5. Sustained Mitogen-activated Protein Kinase (MAPK) and Cytoplasmic Phospholipase A2 Activation by Macrophage Migration Inhibitory Factor (MIF) REGULATORY ROLE IN CELL PROLIFERATION AND GLUCOCORTICOID ACTION*. Journal of Biological Chemistry (1999).
6. Macrophage Migration Inhibitory Factor Induces B Cell Survival by Activation of a CD74-CD44 Receptor Complex*. Journal of Biological Chemistry (2007).
7. Role of MIF Cytokine/CD74 Receptor Pathway in Protecting Against Injury and Promoting Repair. Frontiers in Immunology (2020).