Dectin-1 (β-glucan receptor) (Dectin-1)

Dectin-1 is a type II transmembrane pattern recognition receptor primarily expressed on myeloid lineage cells such as macrophages, dendritic cells, neutrophils and some γδ T cells. It is encoded by the CLEC7A gene. Structurally classified within the C-type lectin family but lacking calcium dependence for ligand binding, it specifically recognizes polysaccharides known as β-(1→3)/(1→6)-glucans found in fungal cell walls and some bacteria. Upon binding its ligands—including particulate forms like zymosan—the cytoplasmic hemITAM motif initiates intracellular signaling through Syk kinase leading to activation of NF-kB transcription factors. This results in phagocytosis; production of reactive oxygen species; secretion of pro-inflammatory cytokines including interleukin 6 (IL-6), tumor necrosis factor alpha (TNF-α), interleukin 8 (IL-8) and interleukin 1 beta (IL-1β); antigen presentation; and trained immunity responses. The biological outcome depends on cell type context—with CR3 being more important on neutrophils—and co-engagement with other receptors like TLR2/TLR4 can modulate these effects. Therapeutically relevant roles include antifungal defense enhancement, anti-tumor activity, modulation of inflammation, potential treatment adjuncts for infection control, but also possible involvement in autoimmune pathologies if dysregulated.

Other names

β-glucan receptorCLEC7A (gene name)C-type lectin domain family 7 member A

Drugs or biologics that target this molecule act by binding to the carbohydrate recognition domain of Dectin-1, triggering downstream signaling via Syk kinase and CARD9/Bcl10/Malt1 pathways. This leads to activation of NF-κB, production of pro-inflammatory cytokines such as IL-6, IL-8, TNF-α and IL-1β, induction of phagocytosis and oxidative burst in myeloid cells. Co-stimulation with TLR2/TLR4 can modulate the immune response further.