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Normal Hemopoiesis

The TLR1/2 agonist PAM3CSK4 instructs commitment of human hematopoietic stem cells to a myeloid cell fate

Leukemia volume 23, pages 2063–2074 (2009)Cite this article

Abstract

Toll-like receptors (TLRs) constitute a family of nonpolymorphic receptors that are devoted to pathogen recognition. In this work, we have explored the impact of TLR ligands (TLR-L) on human hematopoietic stem cells (HSCs) and hematopoietic progenitor cells (HPCs). We show that HSCs and HPCs have a comparable pattern of expression of TLR transcripts characterized by the predominance of TLR1, -2, -3, -4 and -6. In long-term cultures of HSCs, HPCs and stromal cells, most TLR-L profoundly inhibited B-cell development while preserving or enhancing the production of myeloid cells. In short-term cultures, the TLR1/2 ligand PAM3CSK4 induced a large proportion of HPCs to express markers of the myelomonocytic lineage. PAM3CSK4 induced only marginal expression of myeloid lineage markers on HSCs but promoted their myeloid commitment as revealed by their acquisition of the phenotype of multi- and bipotential myeloid progenitors and by upregulation of the transcription factors PU.1, C/EBPα and GATA-1. Our results suggest that TLR agonists can bias the lineage commitment of human HSCs and shift the differentiation of lineage-committed progenitors to favor myelopoiesis at the expense of lymphoid B-cell development.

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Acknowledgements

This work was supported by grants from ARC, and K De Luca was supported by the French Society for Hematology. We thank the physicians and nurses of the Department of Obstetrics of the Clinique du Tonkin (Lyon, Villleurbanne) for their invaluable help in collecting cord blood samples. We are particularly indebted to Mrs Sylvaine Coponat (Clinique du Tonkin) for her motivation and dedication to maintaining the link between clinics and research.

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Authors and Affiliations

  1. INSERM, U851, 21 Avenue Tony Garnier, Lyon, France

    K De Luca, V Frances-Duvert, M-J Asensio, R Ihsani, E Debien, M Taillardet, L Genestier & T Defrance

  2. Université de Lyon, Lyon 1, IFR128, Biosciences Lyon-Gerland, Lyon, France

    K De Luca, V Frances-Duvert, M-J Asensio, R Ihsani, E Debien, M Taillardet, E Verhoeyen, L Genestier & T Defrance

  3. Human Virology Department, INSERM U758, Lyon, France

    E Verhoeyen

  4. Ecole Normale Supérieure de Lyon, Lyon, France

    E Verhoeyen

  5. Plateau technique de cytométrie en flux, IFR128, Lyon, France

    C Bella

  6. Department of Obstetrics, Centre Hospitalier de Valence, Valence, France

    S Lantheaume

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  1. K De Luca
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  2. V Frances-Duvert
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Correspondence to T Defrance.

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Supplementary Information accompanies the paper on the Leukemia website (http://www.nature.com/leu)

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De Luca, K., Frances-Duvert, V., Asensio, MJ. et al. The TLR1/2 agonist PAM3CSK4 instructs commitment of human hematopoietic stem cells to a myeloid cell fate. Leukemia 23, 2063–2074 (2009). https://doi.org/10.1038/leu.2009.155

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