Depletion of Alloreactive T-Cells by Anti-CD137-Saporin Immunotoxin

Author:

Lee Sang C.12,Seo Kwang W.13,Kim Hye J.1,Kang Sang W.4,Choi Hye-Jeong5,Kim Ansuk6,Kwon Byoung S.7,Cho Hong R.18,Kwon Byungsuk14

Affiliation:

1. Biomedical Research Center, Ulsan University Hospital, College of Medicine, University of Ulsan, Ulsan, Republic of Korea

2. Personalized Medicine System R&D Center, Bio-support Co., Ltd., Anyang, Republic of Korea

3. Department of Internal Medicine, Ulsan University Hospital, College of Medicine, University of Ulsan, Ulsan, Republic of Korea

4. School of Biological Sciences, University of Ulsan, Ulsan, Republic of Korea

5. Department of Pathology, Ulsan University Hospital, College of Medicine, University of Ulsan, Ulsan, Republic of Korea

6. Department of Anesthesiology and Pain Medicine, Ulsan University Hospital, College of Medicine, University of Ulsan, Ulsan, Republic of Korea

7. Division of Cell and Immunobiology and Research and Development Center for Cancer Therapeutics, National Cancer Center, Ulsan, Republic of Korea

8. Department of Surgery, Ulsan University Hospital, College of Medicine, University of Ulsan, Ulsan, Republic of Korea

Abstract

Depletion of alloreactive T-lymphocytes from allogeneic bone marrow tansplants may prevent graft-versus-host disease (GVHD) without impairing donor cell engraftment, immunity, and the graft-versus-leukemia (GVL) effect. Alloreactive T-cells may be identified by their expression, upon activation, of CD137, a costimulatory receptor and putative surrogate marker for antigen-specific effector T-cells. In this context, we tested the use of anti-CD137-saporin immunotoxin to selectively deplete mouse and human alloreactive T-cells. Anti-CD137 antibodies were internalized by cells within 4 h of binding to the cell surface CD137, and anti-CD137-saporin immunotoxin effectively killed polyclonally activated T-cells or antigen-stimulated T-cells. Transfer of donor T-cells after allodepletion with anti-CD137-saporin immunotoxin failed to induce any evident expression of GVHD; however, a significant GVL effect was observed. Targeting of CD137 with an immunotoxin was also effective in killing polyclonally activated or alloreactive human T-cells. Our results indicate that anti-CD137-saporin immunotoxin may be used to deplete alloreactive T-cells prior to bone marrow transplantation and thereby prevent GVHD and the relapse of leukemia.

Publisher

SAGE Publications

Subject

Transplantation,Cell Biology,Biomedical Engineering

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