An Acute Negative Bystander Effect of γ-irradiated Recipients on Transplanted Hematopoietic Stem Cells

Overview

Journal Blood

Publisher Elsevier

Specialty Hematology

Date 2012 Mar 1

PMID 22374698

Citations 34

Authors

Hongmei Shen

Hui Yu

Paulina H Liang

Haizi Cheng

Richard Xufeng

Youzhong Yuan

Peng Zhang

Clayton A Smith

Tao Cheng

Affiliations

Soon will be listed here.

Abstract

Ultimate success of hematopoietic stem cell transplantation (HSCT) depends not only on donor HSCs themselves but also on the host environment. Total body irradiation is a component in various host conditioning regimens for HSCT. It is known that ionizing radiation exerts "bystander effects" on nontargeted cells and that HSCs transplanted into irradiated recipients undergo proliferative exhaustion. However, whether irradiated recipients pose a proliferation-independent bystander effect on transplanted HSCs is unclear. In this study, we found that irradiated mouse recipients significantly impaired the long-term repopulating ability of transplanted mouse HSCs shortly (∼ 17 hours) after exposure to irradiated hosts and before the cells began to divide. There was an increase of acute cell death associated with accelerated proliferation of the bystander hematopoietic cells. This effect was marked by dramatic down-regulation of c-Kit, apparently because of elevated reactive oxygen species. Administration of an antioxidant chemical, N-acetylcysteine, or ectopically overexpressing a reactive oxygen species scavenging enzyme, catalase, improved the function of transplanted HSCs in irradiated hosts. Together, this study provides evidence for an acute negative, yet proliferation-independent, bystander effect of irradiated recipients on transplanted HSCs, thereby having implications for HSCT in both experimental and clinical scenarios in which total body irradiation is involved.

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