p38 mitogen-activated protein kinase has different degrees of activation in myeloproliferative disorders and

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Updated: Jul 1, 2026

Proliferation and Differentiation of Murine Myeloid Precursor 32D/G-CSF-R Cells
10:21

Proliferation and Differentiation of Murine Myeloid Precursor 32D/G-CSF-R Cells

Published on: February 21, 2018

Munir Shahjahan1, Cherie H Dunphy, April Ewton

  • 1Department of Pathology, Methodist Hospital and Methodist Research Institute, Houston, TX, USA.

American Journal of Clinical Pathology
|September 17, 2008
PubMed

Insights

p38 mitogen-activated protein kinase (MAPK) activation differs between myelodysplastic syndromes (MDS) and myeloproliferative disorders (MPD). Increased p38 MAPK activation in MDS may inhibit blood cell production, while decreased activation in MPD may promote it.

Area of Science:

  • Hematology
  • Molecular Biology
  • Oncology

Background:

  • Myelodysplastic syndromes (MDS) and myeloproliferative disorders (MPD) are clonal hematopoietic stem cell disorders.
  • The p38 mitogen-activated protein kinase (MAPK) pathway plays a role in cellular processes including proliferation, differentiation, and apoptosis.
  • Dysregulation of the p38 MAPK pathway has been implicated in various hematologic malignancies.

Purpose of the Study:

  • To investigate and compare the activation patterns of p38 MAPK in patients with MDS and MPD.
  • To explore the potential role of p38 MAPK activation in the pathogenesis of these disorders.

Main Methods:

  • Immunohistochemical analysis of phosphorylated (activated) p38 MAPK.
  • Utilized formalin-fixed, decalcified bone marrow core biopsy specimens.
  • Compared activation levels across myeloid and megakaryocytic lineages in 33 MDS, 32 MPD, and 11 control cases.

Main Results:

  • Moderate p38 MAPK activation was common in MDS.
  • Weak p38 MAPK activation was observed in MPD and control cases, particularly in the erythroid lineage.
  • Stronger p38 MAPK activation in myeloid and megakaryocytic lineages was significantly more frequent in MDS compared to both MPD and control groups.
  • Conversely, weak p38 MAPK activation in myeloid and megakaryocytic lineages was more frequent in MPD compared to controls.

Conclusions:

  • Increased p38 MAPK activation in MDS may contribute to impaired hematopoiesis and cytopenias.
  • Relatively decreased p38 MAPK activation in MPD might promote increased hematopoiesis, leading to cytosis.
  • p38 MAPK activation patterns may serve as a distinguishing feature between MDS and MPD and offer therapeutic targets.

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