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Megakaryocytic hyperplasia in myeloproliferative neoplasms is driven by disordered proliferative, apoptotic and

Jacques A J Malherbe1, Kathryn A Fuller1, Ayesha Arshad1

  • 1School of Pathology and Laboratory Medicine, University of Western Australia, Crawley, Western Australia, Australia.

Journal of Clinical Pathology
|August 21, 2015
PubMed
Abstract

Insights

Myeloproliferative neoplasms (MPN) involve increased megakaryocyte proliferation and reduced apoptosis, influenced by epigenetic defects. CALR mutations specifically impair apoptosis, potentially explaining higher platelet counts in MPN.

Area of Science:

  • Hematology
  • Oncology
  • Molecular Biology

Background:

  • Myeloproliferative neoplasms (MPN) are clonal bone marrow diseases with abnormal megakaryocyte growth.
  • The exact mechanisms driving megakaryocyte abnormalities in MPN are not fully understood.
  • Understanding these processes is crucial for developing targeted therapies.

Purpose of the Study:

  • To investigate the proliferative, apoptotic, and epigenetic profiles of megakaryocytes in human MPN.
  • To elucidate the pathobiological processes underlying megakaryocytic hyperplasia in MPN.
  • To identify potential differences in these profiles based on specific mutations (JAK2, CALR).

Main Methods:

  • Bone marrow biopsies from 81 MPN patients and 15 controls were analyzed.
  • Immunohistochemistry was used to assess megakaryocyte expression of biomarkers.
  • Biomarkers included Ki67 (proliferation), Bcl-XL and BNIP-3 (apoptosis), and EZH2/SUZ12 (epigenetics).

Main Results:

  • MPN megakaryocytes exhibited increased Ki67 and Bcl-XL, decreased BNIP-3, and elevated SUZ12 compared to controls.
  • Essential thrombocythaemia showed a proliferative signature in large megakaryocytes.
  • Myelofibrotic MPN and CALR-mutated cases displayed reduced pro-apoptotic BNIP-3.

Conclusions:

  • Uncontrolled megakaryocyte expansion in MPN stems from increased proliferation, reduced apoptosis, and epigenetic dysregulation.
  • CALR mutations appear to promote apoptotic failure, potentially leading to higher platelet counts.
  • These findings offer insights into MPN pathogenesis and therapeutic targets.
Keywords:
APOPTOSISBONE MARROWPROLIFERATIONfibrosis

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