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Transplantation of IL-2-transduced murine bone marrow is associated with dose-dependent toxicity.

Abstract：

OBJECTIVE:The purpose of this study was to investigate the effects of interleukin-2 (IL-2) gene-transduced hematopoietic progenitor cells or cytotoxic function and systemic toxicity following syngeneic bone marrow transplantation. MATERIAL AND METHODS:Marrow of 5-fluorouracil pretreated donor mice were transfected with a retroviral vector containing the murine IL-2 gene and transplanted into lethally irradiated syngeneic hosts. RESULTS:Productive insertion of the IL-2 gene could be demonstrated at various intervals post-transplant without impairment of hematopoietic engraftment. Endogenously augmented IL-2 release resulted in a selective increase in CD4(+), CD8(+), and NK1.1(+) population in spleen and bone marrow, as well as significant cytolytic activity against syngeneic leukemia cells in vitro. Our results also illustrate the interdependence among the magnitude of systemic IL-2 levels, the number of IL-2-transduced cells in the transplant inoculum, and the appearance of systemic toxicity. Infusion of marrow transduced with high-titer, high-expressing IL-2 retrovirus resulted in significant morbidity and mortality in the recipients. Our studies demonstrate that mortality was secondary to severe lymphocytic infiltration of liver and lung, which was associated with increased expression of intercellular adhesion molecule-1 and vascular adhesion molecule-1. Reducing the number of IL-2-transduced cells in the bone marrow inoculum, however, resulted in significantly improved survival with no adverse events being evident during the post-transplant period. CONCLUSION:Delivery of IL-2 to the bone marrow can be achieved by transplantation of genetically modified hematopoietic cells, however, the overall feasibility is strongly influenced by the number of transduced cells in the bone marrow inocolum and/or the expression pattern of IL-2 in vivo.

journal_name

Exp Hematol

journal_title

Experimental hematology

authors

Kühr T,Bechter O,Dirnhofer S,Geley S,Gächter A,Pall G,Url M,Dietrich H,Oberaigner P,Klima G,Eisterer W,Hilbe W,Lukas P,Thaler J

doi

10.1016/s0301-472x(00)00487-2

keywords:

subject

Has Abstract

pub_date

2000-08-01 00:00:00

pages

895-906

issue

8

eissn

0301-472X

issn

1873-2399

pii

S0301-472X(00)00487-2

journal_volume

28

pub_type

杂志文章

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