Invariant NK T (iNKT) cells have an invariant TCR-alpha chain and are activated in a CD1d-restricted manner. They are thought to regulate immune responses and play important roles in autoimmunity, allergy, infection, and tumor immunity. They also appear to influence immunity after hemopoietic stem cell transplantation. In this study, we examined the role of iNKT cells in graft-vs-host disease (...

4-1BB is expressed on activated CD4(+) and CD8(+) T cells; its ligand, 4-1BB ligand is expressed on APCs. Despite expression on both T cell subpopulations, 4-1BB has been reported to predominantly affect CD8(+) T cell responses. By quantifying graft-vs-host disease alloresponses in vivo, we demonstrate that both CD4(+) and CD8(+) T cell-mediated alloresponses are regulated by 4-1BB/4-1BB ligand...

We transferred naive alloreactive CD8 T cells from TCR transgenic mice to irradiated recipients expressing a partial (H-2Kbm8) or a full (H-2Kb) agonist alloantigen (alloAg). The consequences were strikingly distinct, resulting in acceleration of host lymphopoiesis in the former group, but in strong graft-vs-host reaction, preventing host lymphocyte reconstitution in the latter group. This was ...

OBJECTIVE Composites sorption and solubility can be precursors of several chemical and physical processes, which lead to deleterious effects on the polymer structure. This study evaluated the effect of mouthwashes on solubility and sorption of composite resins. MATERIALS AND METHODS Forty-two specimens of each evaluated composite (Filtek Bulk Fill Flow, Opallis Flow, Durafill VS, and Filtek Z...

Bone marrow transplantation (BMT) is a technique used in the treatment of leukemia, lymphoma, aplastic anemia, multiple myeloma, immune deficiency disorders, and certain solid tumors such as breast and ovarian carcinoma. It is a salvage technique that permits high-dose, myelosuppressive chemotherapy to be given, achieving greater response rates to therapy. After giving high-dose therapy, treati...

Immunomodulation of cell-mediated immunity was studied in mice treated with either lithium chloride (LiCl), anti-CD8 monoclonal antibody or their combination. While 6-day LiCl treatment decreased the ability of their splenocytes to induce a local graft-versus-host reaction--anti-CD8 abolished this effect. The proliferative response of spleen cells from those three groups of mice to concanavalin...

The graft-vs-tumor effect is an important part of the curative potential of allogeneic transplantation. We characterized the effect of transplanted donor mononuclear cells on relapse- and event-free survival after allogeneic bone marrow transplantation (BMT). We studied 113 consecutive patients with hematologic malignancies who received non-T-cell-depleted BMT from human leukocyte antigen (HLA)...

Suicide gene therapy is one approach being evaluated for the control of graft-vs-host disease (GVHD) after allogeneic bone marrow transplantation (BMT). We recently constructed a novel chimeric suicide gene in which the entire coding region of HSV thymidine kinase (HSV-tk) was fused in-frame to the extracellular and transmembrane domains of human CD34 (DeltaCD34-tk). DeltaCD34-tk is an attracti...