Modulation of sheep lymphocyte responses by Fasciola hepatica excretory-secretory products.
The effect of Fasciola hepatica excretory-secretory products (FhESPs) on mitogen-induced proliferation of sheep peripheral blood mononuclear cells (PBMCs) and PBMC subsets (CD2(+), CD4(+), CD8(+), gammadeltaTCR(+) or CD21(+) cells) were studied. PBMCs were incubated with Concanavalin A (ConA) or phytohemagglutinin (PHA) at optimal (1 microg per well) or suboptimal (0.25 microg per well) doses and with FhESPs at several doses (1.25-20 microg per well). PBMC subsets were incubated with ConA at a suboptimal dose and with FhESPs at 5 microg per well. These cells were incubated with or without monocytes (CD14(+) cell). FhESPs slightly increased the proliferation of PBMCs stimulated with optimal doses of PHA. FhESPs (10 and 20 microg per well) inhibited the PBMCs stimulated with optimal doses of ConA. FhESP dose-dependent inhibition was observed on PBMCs stimulated with suboptimal doses of ConA. CD21(+) lymphocytes (B lymphocytes), CD14(+) cells (monocytes) and gammadeltaTCR(+) cells were not stimulated by ConA. T lymphocyte subsets (CD2(+), CD4(+) or CD8(+) cells) proliferation was decreased by FhESPs at 5 microg per well. FhESPs inhibits the ConA-induced stimulation of sheep PBMCs and sheep T lymphocyte subsets. Further studies should be done to investigate the mechanism of this FhESP immunomodulatory effect.
Moreau
Emmanuelle
E
UMR INRA/ENVN Interactions, Hôte-Parasite-Milieu, Ecole Nationale Vétérinaire de Nantes, BP 40706, F-44307 Nantes Cedex 03, France. moreau@vet-nantes.fr
Hervé
Sebbag
S
Yu
Zhang Wei
ZW
Alain
Chauvin
C
D000818:Animals; D000947:Antigens, Helminth / Q000276:immunology*; D002455:Cell Division / Q000276:immunology; D003208:Concanavalin A / Q000276:immunology; D005210:Fasciola hepatica / Q000276:immunology*; D005211:Fascioliasis / Q000276:immunology / Q000469:parasitology / Q000662:veterinary*; D005434:Flow Cytometry / Q000662:veterinary; D007963:Leukocytes, Mononuclear / Q000187:drug effects / Q000276:immunology; D008213:Lymphocyte Activation / Q000276:immunology; D016131:Lymphocyte Subsets / Q000276:immunology; D008214:Lymphocytes / Q000166:cytology / Q000276:immunology*; D012756:Sheep; D012757:Sheep Diseases / Q000276:immunology / Q000469:parasitology*
D000947:Antigens, Helminth; D003208:Concanavalin A