The beta-glucan receptor, dectin-1, is predominantly expressed on the surface of cells of the monocyte/macrophage and neutrophil lineages.
We recently identified dectin-1 (betaGR) as a major beta-glucan receptor on leukocytes and demonstrated that it played a significant role in the non-opsonic recognition of soluble and particulate beta-glucans. Using a novel mAb (2A11) raised against betaGR, we show here that the receptor is not dendritic cell-restricted as first reported, but is broadly expressed, with highest surface expression on populations of myeloid cells (monocyte/macrophage (Mphi) and neutrophil lineages). Dendritic cells and a subpopulation of T cells also expressed the betaGR, but at lower levels. Alveolar Mphi, like inflammatory Mphi, exhibited the highest surface expression of betaGR, indicative of a role for this receptor in immune surveillance. In contrast, resident peritoneal Mphi expressed much lower levels of betaGR on the cell surface. Characterization of the nonopsonic recognition of zymosan by resident peritoneal Mphi suggested the existence of an additional beta-glucan-independent mechanism of zymosan binding that was not observed on elicited or bone marrow-derived Mphi. Although this recognition could be inhibited by mannan, we were able to exclude involvement of the Mphi mannose receptor and complement receptor 3 in this process. These observations imply the existence of an additional mannan-dependent receptor involved in the recognition of zymosan by resident peritoneal Mphi.
Taylor
Philip R
PR
Sir William Dunn School of Pathology, Oxford University, Oxford, United Kingdom.
Brown
Gordon D
GD
Reid
Delyth M
DM
Willment
Janet A
JA
Martinez-Pomares
Luisa
L
Gordon
Siamon
S
Wong
Simon Y C
SY
D016475:3T3 Cells; D000818:Animals; D001202:Ascitic Fluid / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D001854:Bone Marrow Cells / Q000276:immunology / Q000378:metabolism; D002460:Cell Line; D019070:Cell Lineage / Q000235:genetics / Q000276:immunology; D002462:Cell Membrane / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D005936:Glucans / Q000378:metabolism; D037181:Lectins, C-Type; D007941:Leukemia P388; D016676:Macrophages, Alveolar / Q000276:immunology / Q000378:metabolism; D017737:Macrophages, Peritoneal / Q000276:immunology / Q000378:metabolism; D008565:Membrane Proteins / Q000096:biosynthesis* / Q000097:blood / Q000235:genetics; D051379:Mice; D008810:Mice, Inbred C57BL; D009000:Monocytes / Q000276:immunology / Q000378:metabolism; D022423:Myeloid Cells / Q000276:immunology* / Q000378:metabolism*; D009419:Nerve Tissue Proteins / Q000096:biosynthesis* / Q000097:blood / Q000235:genetics; D009504:Neutrophils / Q000276:immunology / Q000378:metabolism; D009895:Opsonin Proteins / Q000378:metabolism; D009928:Organ Specificity / Q000235:genetics / Q000276:immunology; D012333:RNA, Messenger / Q000096:biosynthesis; D011971:Receptors, Immunologic / Q000096:biosynthesis* / Q000097:blood / Q000235:genetics; D013154:Spleen / Q000166:cytology / Q000276:immunology / Q000378:metabolism; D015054:Zymosan / Q000378:metabolism; D047071:beta-Glucans; D000099181:Dectin-1
D005936:Glucans; D037181:Lectins, C-Type; D008565:Membrane Proteins; D009419:Nerve Tissue Proteins; D009895:Opsonin Proteins; D012333:RNA, Messenger; D011971:Receptors, Immunologic; D015054:Zymosan; D047071:beta-Glucans; D000099181:Dectin-1; C045268:beta-glucan receptor; C033363:beta-1,3-glucan