Induction of donor-specific T-cell hyporesponsiveness using dexamethasone-treated dendritic cells in two fully mismatched rat kidney transplantation models.

Abstract:

BACKGROUND:Dendritic cells (DC) can exert powerful immune stimulatory as well as regulatory functions and are therefore important tools for therapeutic strategies. Dexamethasone (Dex) was previously shown to inhibit DC maturation and to induce regulatory properties both in vitro and in vivo. Here, we investigated the immunoregulatory role of DexDC in two different rat acute rejection models of kidney transplantation. METHODS:Rat DC were generated from BN and DA bone marrow in the presence of the corticosteroid, Dex. The function of Dex-modulated DC was analyzed in vitro and in vivo, using a BN to LEW and a DA to LEW renal transplantation model in the absence of other forms of immunosuppression. T cells of transplanted rats were isolated and restimulated with donor mature DC (lipopolysaccharide [LPS] or CD40L activated). T-cell responsiveness was analyzed by proliferative capacity and IFN-gamma production. RESULTS:Stimulation of Dex-modulated rat DC with LPS resulted in normal IL-10 production, whereas synthesis of IL-12 was impaired. In accordance, the capacity of LPS-DexDC to stimulate T-cell activation was decreased. In both renal transplantation models, treatment with donor-derived LPS-DexDC induced a significant donor-specific T-cell hyporesponse. However, pretreatment did not result in a prolonged graft survival. CONCLUSIONS:In two fully mismatched kidney transplantation models, donor-derived LPS-DexDC induce a donor-specific T-cell hyporesponse. However, in this setting allograft survival was not improved, suggesting an important role for T cells with indirect alloreactivity. Understanding the underlying mechanism involved in the rejection process will improve the development of a cell-based immunotherapy.

journal_name

Transplantation

journal_title

Transplantation

authors

Stax AM,Gelderman KA,Schlagwein N,Essers MC,Kamerling SW,Woltman AM,van Kooten C

doi

10.1097/TP.0b013e31818a6682

subject

Has Abstract

pub_date

2008-11-15 00:00:00

pages

1275-82

issue

9

eissn

0041-1337

issn

1534-6080

pii

00007890-200811150-00018

journal_volume

86

pub_type

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