INVESTIGADORES
CHULUYAN Hector Eduardo
congresos y reuniones científicas
Título:
Polymorphonuclear leukocytes mediate the immune modulation of dendritic cells, increasing or decreasing its immunostimulatory capacity and expression of DC-SIGN.
Autor/es:
MAFFIA P; AMIANO N; GUERRIERI D; REITIERI M, TATEOSIAN NANCY; CHULUYAN E.
Lugar:
Cordoba, Argentina
Reunión:
Congreso; 7º congreso de la Asociacion Latinoamericana de Inmunologia; 2005
Institución organizadora:
ALAI
Resumen:
ABSTRACTThe aim of this work was to evaluate the ability of human polymorphonuclear leukocytes (PMNL) to modulate the allostimulatory ability of dendritic cells (DCs). Previous report showed that PMNL increase DCs-mediated allogenic T cell proliferation, perhaps through DC-SIGN molecule on DCs. In this work we demonstrate that T cells stimulatory capacity of DCs incubated with PMNL, varied in accordance to the amount of PMNL used. Proliferation of allogeneic T cells was evaluated by coincubating DCs with syngeneic PMNLs in a [H3] thymidine incorporation assay. DCs-induced T cell proliferation decreased in the presence of 50.103 or 100.103 PMNL. However, 5.103 PMNL per well increased the DCs-induced T cell proliferation (Table). Furthermore, the expression of DC-SIGN on the surface of DCs was evaluated in an immunofluorescent assay. A 48% decrease in MFI was seen on DCs incubated with culture supernatant derived from 1.106 PMNLs , but not lower. These results suggest that PMNL are able to up or downmodulate the allostimulatory ability of DCs, probably by modifying the expression of DC-SIGN.   PMNLs 0 5.103 50.103 100.103 T cell proliferation cpm x 103 14.3±4.4 40±10 8.7±3.8 6±3.7 p<0.05   * * *