IL-4 down-regulates anaphylatoxin receptors in monocytes and dendritic cells and impairs anaphylatoxin-induced migration in vivo.
Anaphylatoxins mobilize leukocytes to the sites of inflammation. In the present study we investigated the impact of GM-CSF, IL-4, and IFN-gamma on anaphylatoxin receptor expression in monocytes and dendritic cells (DC). IL-4 was identified as the strongest down-regulator of the receptors for C5a and C3a in monocytes and monocyte-derived DC (MoDC). To study the impact of IL-4 on anaphylatoxin-induced chemotaxis, an in vivo migration model was established. For this purpose, human monocytes and MoDC were injected i.v. into SCID mice that at the same time received anaphylatoxins into the peritoneal cavity. A peritoneal influx of human monocytes could be demonstrated by 4 h after injections of C5a and C3a. In line with receptor down-regulation, IL-4 treatment inhibited in vivo mobilization of human monocytes and MoDC in response to C5a and C3a. In addition to its effects on human cells, IL-4 reduced C5a receptors in murine bone marrow-derived DC and impaired recruitment of labeled bone marrow-derived DC in syngeneic BALB/c mice to i.p. injected C5a. Overall, these data suggest that inhibition of a rapid anaphylatoxin-induced mobilization of monocytes and DC to inflamed tissues represents an important anti-inflammatory activity of the Th2 cytokine IL-4.
Soruri
Afsaneh
A
Department of Immunology, Georg August University Gottingen, Gottingen, Germany.
Kiafard
Ziba
Z
Dettmer
Claudia
C
Riggert
Joachim
J
Köhl
Jörg
J
Zwirner
Jörg
J
D000707:Anaphylaxis / Q000276:immunology / Q000473:pathology; D000818:Animals; D015703:Antigens, CD / Q000096:biosynthesis* / Q000378:metabolism; D001854:Bone Marrow Cells / Q000166:cytology; D002454:Cell Differentiation / Q000276:immunology; D002465:Cell Movement / Q000276:immunology*; D002478:Cells, Cultured; D003176:Complement C3 / Q000008:administration & dosage* / Q000378:metabolism; D015936:Complement C5a / Q000008:administration & dosage* / Q000378:metabolism; D003713:Dendritic Cells / Q000166:cytology / Q000276:immunology* / Q000378:metabolism; D004195:Disease Models, Animal; D015536:Down-Regulation / Q000276:immunology*; D005260:Female; D006801:Humans; D007274:Injections, Intraperitoneal; D007275:Injections, Intravenous; D015847:Interleukin-4 / Q000008:administration & dosage / Q000494:pharmacology*; D008297:Male; D008565:Membrane Proteins; D051379:Mice; D008807:Mice, Inbred BALB C; D016513:Mice, SCID; D009000:Monocytes / Q000276:immunology* / Q000378:metabolism / Q000637:transplantation; D044087:Receptor, Anaphylatoxin C5a; D011951:Receptors, Complement / Q000037:antagonists & inhibitors / Q000096:biosynthesis* / Q000378:metabolism; D014407:Tumor Cells, Cultured
D015703:Antigens, CD; D003176:Complement C3; D008565:Membrane Proteins; D044087:Receptor, Anaphylatoxin C5a; D011951:Receptors, Complement; C085567:complement C3a receptor; D015847:Interleukin-4; D015936:Complement C5a