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Differentiation

Effects of overexpression of HBP1 upon growth and differentiation of leukemic myeloid cells

Leukemia volume 19, pages 1958–1968 (2005)Cite this article

Abstract

HMG-box containing protein 1 (HBP1) is a member of the high mobility group (HMG) of chromosomal proteins. Since HBP1 exhibits tumor-suppressor activity in nonmyeloid tissues, we examined the effects of ectopic overexpression of HBP1 upon the growth and differentiation of myeloid cells. We prepared transient and stable transfectants of the myeloblast cell line K562, which overexpress HBP1 mRNA and protein. HBP1 transfectants displayed slower growth in cell culture and reduced colony formation in soft agar, retardation of S-phase progression, reduced expression of cyclin D1 and D3 mRNAs and increased expression of p21 mRNA. HBP1 transfectants also underwent increased apoptosis, as demonstrated by morphology and binding of Annexin V. Fas ligand mRNA levels were increased in HBP1 transfectants, suggesting involvement of the Fas/Fas ligand pathway. HBP1 overexpression enhanced differentiation of K562 cells towards erythroid and megakaryocyte lineages, as evidenced by increased hemoglobin and CD41a expression. Overexpression of HBP1 modulated mRNA levels for myeloid-specific transcription factors C/EBPα, c-Myb, c-Myc, and JunB, as well as lineage-specific transcription factors PU.1, GATA-1, and RUNX1. These findings suggest that in myeloid cells HBP1 may serve as a tumor suppressor and a general differentiation inducer and may synergize with chemical differentiating agents to enhance lineage-specific differentiation.

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Acknowledgements

This work was supported by a VA Merit grant to GEA.

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Authors and Affiliations

  1. Department of Pathology and Laboratory Medicine, Veterans Affairs Medical Center, Decatur, GA, USA

    C J Yao, K Works & G E Austin

  2. Emory University School of Medicine, Atlanta, GA, USA

    C J Yao, P A Romagnoli & G E Austin

  3. Department of Pediatrics, Veterans Affairs Medical Center, Decatur, GA, USA

    P A Romagnoli

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  1. C J Yao
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  2. K Works
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  4. G E Austin
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Correspondence to G E Austin.

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Yao, C., Works, K., Romagnoli, P. et al. Effects of overexpression of HBP1 upon growth and differentiation of leukemic myeloid cells. Leukemia 19, 1958–1968 (2005). https://doi.org/10.1038/sj.leu.2403918

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