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Molecular and Cellular Biology, November 2002, p. 7678-7687, Vol. 22, No. 21
0270-7306/02/$04.00+0     DOI: 10.1128/MCB.22.21.7678-7688.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Transformation of Bone Marrow B-Cell Progenitors by E2A-HLF Requires Coexpression of BCL-2

Kevin S. Smith, Joon Whan Rhee, and Michael L. Cleary*

Department of Pathology, Stanford University School of Medicine, Stanford, California 94305

Received 23 January 2002/ Returned for modification 28 May 2002/ Accepted 30 July 2002

The chimeric transcription factor E2a-Hlf is an oncoprotein associated with a subset of acute lymphoblastic leukemias of early B-lineage derivation. We employed a retroviral transduction-transplantation approach to evaluate the oncogenic effects of E2a-Hlf on murine B-cell progenitors harvested from adult bone marrow. Expression of E2a-Hlf induced short-lived clusters of primary hematopoietic cells but no long-term growth on preformed bone marrow stromal cell layers comprised of the AC6.21 cell line. Coexpression with Bcl-2, however, resulted in the sustained self-renewal of early preB-I cells that required stromal and interleukin-7 (IL-7) support for growth in vitro. Immortalized cells were unable to induce leukemias after transplantation into nonirradiated syngeneic hosts, unlike the leukemic properties and cytokine independence of preB-I cells transformed by p190Bcr-Abl under identical in vitro conditions. However, bone marrow cells expressing E2a-Hlf in combination with Bcl-2, but not E2a-Hlf alone, induced leukemias in irradiated recipients with long latencies, demonstrating both a requirement for suppression of apoptosis and the need for further secondary mutations in leukemia pathogenesis. Coexpression of IL-7 substituted for Bcl-2 to induce the in vitro growth of pre-B cells expressing E2a-Hlf, but leukemic conversion required additional abrogation of undefined stromal requirements and was associated with alterations in the Arf/Mdm2/p53 pathway. Thus, E2a-Hlf enhances the self-renewal of bone marrow B-cell progenitors without inciting a p53 tumor surveillance response or abrogating stromal and cytokine requirements for growth, which are nevertheless abrogated during progression to a leukemogenic phenotype.

* Corresponding author. Mailing address: Department of Pathology, Stanford University School of Medicine, Stanford, CA 94305. Phone: (650) 723-5471. Fax: (650) 498-6222. E-mail: michael.cleary{at}stanford.edu.

Molecular and Cellular Biology, November 2002, p. 7678-7687, Vol. 22, No. 21
0022-538X/02/$04.00+0     DOI: 10.1128/MCB.22.21.7678-7688.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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