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T-lymphocyte function from peripheral blood stem-cell donors is inhibited by activated granulocytes.

Abstract：

BACKGROUND:PBSC transplant provides 10 times more T cells than BMT However, the incidence and severity of acute GvHD is similar among recipients of both types of transplants. Studies in mouse models suggest that the similar clinical outcome in BMT and PBSCT is due to differences in the lymphokine profiles. METHODS:PBMC, PBMC from G-CSF mobilized donors (G-PBMC)and BM mononuclear cells (BM-MC) were analyzed by flow cytometry and ELISA to detect gamma-IFN and IL-4 production. Hematoxylin and eosin staining was used to identify morphology and annexin/propidium-iodide was used for apoptosis assays. RESULTS:We show decreased production of gamma-interferon (85%) and IL-4 (60%) in G-PBMC when compared with either PBMC or BM-MCT cells on ex vivo assays. Surprisingly, 85% of fresh G-PBMC is composed of low-density granulocytes (LDG), which undergo apoptosis after 48 h in culture. At this same time, gamma-IFN production from G-PBMC T cell was reverted. In vitro, G-CSF converts granulocytes into LDGs, able to inhibit T-cell function by H2O2 production, and not through immune-deviation towards a Th2-type phenotype. DISCUSSION:We show that the estimated numbers of Th1 and Th2 cells infused in BMT and PBSCT do not differ significantly. These findings are discussed with reference to the relatively low incidence of acute GvHD in PBSCT shown in the literature. We suggest that these results might depend on the high number of granulocytes and progenitors infused. The potential use of granulocytes as immunosupressive short-term therapy is now being investigated by our group using a mouse experimental model.

journal_name

Cytotherapy

journal_title

Cytotherapy

authors

Vasconcelos ZF,Santos BM,Costa ES,Lima M,Tabak DG,Bouzas LF,Azevedo WM,Barcinski MA,Bonomo A

doi

10.1080/14653240310002252

keywords:

subject

Has Abstract

pub_date

2003-01-01 00:00:00

pages

336-45

issue

4

eissn

1465-3249

issn

1477-2566

pii

XUG05KKG7HLAQB1J

journal_volume

5

pub_type

杂志文章

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