Immunoregulatory pathways

Immunoregulatory pathways represent a broad set of biological signaling cascades and cellular interactions responsible for maintaining immune system balance and preventing excessive inflammatory responses. These pathways involve a variety of molecular components, including cell surface receptors (e.g., PD-1, CTLA-4), ligands (e.g., PD-L1, CD80/86), and intracellular signaling molecules that collectively dictate the magnitude and duration of an immune response (NCI, 2023). In the context of oncology, tumors often exploit these inhibitory pathways to evade detection and destruction by T cells, a process known as immune evasion (Nature Reviews Cancer, 2012). Therapeutic intervention in these pathways has revolutionized medicine, particularly through the use of immune checkpoint inhibitors that release the brakes on the immune system to treat various cancers. Conversely, in autoimmune and inflammatory diseases, drugs are designed to activate or mimic these regulatory signals to suppress overactive immune responses (Nature Reviews Immunology, 2021). Because the term refers to a functional category of multiple distinct molecular targets rather than a single protein, it is classified as a pathway or system rather than an individual therapeutic target.

Other names

Immune checkpointsImmunomodulatory pathwaysImmune regulatory networksImmune homeostasis pathways

Modulation of immune cell activity through the inhibition of negative regulators (checkpoint blockade) or the activation of inhibitory signaling to restore self-tolerance and reduce inflammation.