Downregulation of GATA1 drives impaired hematopoiesis in primary myelofibrosis

Laure Gilles, Ahmet Dirim Arslan, Christian Marinaccio, Qiang Jeremy Wen, Priyanka Arya, Maureen McNulty, Qiong Yang, Jonathan C. Zhao, Katerina Konstantinoff, Terra Lasho, Animesh D Pardanani, Brady Stein, Isabelle Plo, Sriram Sundaravel, Amittha Wickrema, Annarita Migliaccio, Sandeep Gurbuxani, William Vainchenker, Leonidas C. Platanias, Ayalew TefferiJohn D. Crispino

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Abstract

Primary myelofibrosis (PMF) is a clonal hematologic malignancy characterized by BM fibrosis, extramedullary hematopoiesis, circulating CD34+ cells, splenomegaly, and a propensity to evolve to acute myeloid leukemia. Moreover, the spleen and BM of patients harbor atypical, clustered megakaryocytes, which contribute to the disease by secreting profibrotic cytokines. Here, we have revealed that megakaryocytes in PMF show impaired maturation that is associated with reduced GATA1 protein. In investigating the cause of GATA1 downregulation, our gene-expression study revealed the presence of the RPS14-deficient gene signature, which is associated with defective ribosomal protein function and linked to the erythroid lineage in 5q deletion myelodysplastic syndrome. Surprisingly, reduced GATA1 expression and impaired differentiation were limited to megakaryocytes, consistent with a proproliferative effect of a GATA1 deficiency on this lineage. Importantly, expression of GATA1 effectively rescued maturation of PMF megakaryocytes. Together, these results suggest that ribosomal deficiency contributes to impaired megakaryopoiesis in myeloproliferative neoplasms.

Original languageEnglish (US)
Pages (from-to)1316-1320
Number of pages5
JournalJournal of Clinical Investigation
Volume127
Issue number4
DOIs
StatePublished - Apr 3 2017

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ASJC Scopus subject areas

  • Medicine(all)

Cite this

Gilles, L., Arslan, A. D., Marinaccio, C., Wen, Q. J., Arya, P., McNulty, M., Yang, Q., Zhao, J. C., Konstantinoff, K., Lasho, T., Pardanani, A. D., Stein, B., Plo, I., Sundaravel, S., Wickrema, A., Migliaccio, A., Gurbuxani, S., Vainchenker, W., Platanias, L. C., ... Crispino, J. D. (2017). Downregulation of GATA1 drives impaired hematopoiesis in primary myelofibrosis. Journal of Clinical Investigation, 127(4), 1316-1320. https://doi.org/10.1172/JCI82905