Beta-glucan pattern recognition receptor (β-glucan PRR) (β-glucan PRR)

Beta-glucan pattern recognition receptors (PRRs) are a specialized class of immune receptors, with Dectin-1 (CLEC7A) being the most prominent member, that specifically recognize and bind to β-glucans found in fungal and bacterial cell walls (UniProt: Q9BXN2). These receptors are primarily expressed on myeloid cells, including macrophages, dendritic cells, and neutrophils, where they play a critical role in the innate immune system's ability to detect pathogens (PubMed: 16751776). Upon ligand binding, these receptors initiate signaling cascades involving the Syk kinase and CARD9 adapter protein, resulting in phagocytosis, respiratory burst, and the secretion of cytokines like IL-6 and IL-23 (PubMed: 19536192). In the context of disease, they are vital for defense against fungal infections and have been explored as targets for cancer immunotherapy to "re-educate" the immune system to attack tumor cells (PubMed: 21978437). Therapeutic strategies often involve using β-glucan polymers as agonists to enhance immune surveillance or modulate inflammatory responses in conditions like inflammatory bowel disease (PubMed: 28515777). These receptors also cooperate with other PRRs, such as Toll-like receptors, to fine-tune the immune response (PubMed: 12501250).

Other names

Beta-glucan receptorDectin-1C-type lectin domain family 7 member ACLEC7AComplement receptor 3CR3CD11b/CD18Lactosylceramide receptorScavenger receptor

Agonistic binding to the receptor (primarily Dectin-1) triggers intracellular signaling via the Syk-CARD9 pathway, leading to the activation of NF-κB and the production of pro-inflammatory cytokines and reactive oxygen species to enhance host defense or anti-tumor immunity (PubMed: 19536192, PubMed: 21978437).