Please use this identifier to cite or link to this item: https://ninho.inca.gov.br/jspui/handle/123456789/13992
Title: T-Iymphocyte function from peripheral blood stem cell donors is inhibited by activated granulocyte
Authors: Vasconcelos, Zilton Farias Meira de
Santos, Bruna Maria dos
Bouzas, Luis Fernando da Silva
Bonomo, Adriana Cesar
Costa, Elaine Sobral da
Tabak, Daniel Goldberg
Barcinski, Marcello Andre
Lima, Marcos
Keywords: Doença Enxerto-Hospedeiro
Graft vs Host Disease
Transplante
Transplantation
Células Th1
Th1 Cells
Células Th2
Th2 Cells
Citocinas
Cytokines
Neutrófilos
Neutrophils
Issue Date: 2003
Abstract: 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 γ-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 ofy-interferon (85%) and IL-4 (60%) in G-PBMC when compared with either PBMC or BM-MC T 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, γ-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 ofThl 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 immunosu-pressive short-term therapy is now being investigated by our group using a mouse experimental model.
URI: https://ninho.inca.gov.br/jspui/handle/123456789/13992
ISSN: 1465-3249
Appears in Collections:Hospital do Câncer I (HCI)



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.