Global immune system and tissue microenvironment

The global immune system and tissue microenvironment (TME) represent the integrated network of innate and adaptive immune cells, stromal fibroblasts, endothelial cells, and the extracellular matrix that collectively maintain homeostasis and respond to insults (NIH, 2023). This 'target' is not a single molecule but a complex ecosystem; the TME specifically refers to the local environment surrounding a tumor, which often evolves to suppress immune attacks through the recruitment of regulatory T cells and myeloid-derived suppressor cells (Nature Reviews Cancer, 2016). Systemic immunity involves the coordinated action of lymphoid organs and circulating leukocytes to provide broad protection against pathogens (StatPearls, 2023). Therapeutic strategies targeting this system, such as immune checkpoint inhibitors or CAR-T cell therapies, aim to reprogram the microenvironment to favor anti-tumor activity or restore self-tolerance in autoimmune conditions (PubMed, 2021). Because it encompasses a vast array of cell types and signaling pathways, it is considered a system-level concept rather than a discrete therapeutic target. The interaction between systemic immune status and the localized TME is a critical determinant of drug efficacy and patient outcomes in modern immunotherapy (Journal of Clinical Investigation, 2020). Understanding this interplay allows for the development of combination therapies that address both local resistance and systemic immune exhaustion.

Other names

Tumor microenvironmentTMEImmune landscapeSystemic immunityImmune milieuImmune contexture

Broad immunomodulation including checkpoint inhibition, cytokine signaling alteration, lymphocyte recruitment, and suppression of regulatory cell populations.