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CALR-mutated myeloproliferative neoplasms.

Valentina Bellani1, Barbara Mora1, Alessandra Iurlo1

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Leukemia & Lymphoma
|February 17, 2025
PubMed
Summary

Mutations in the calreticulin (CALR) gene drive myeloproliferative neoplasms by activating key signaling pathways. Novel immunotherapies targeting mutant CALR offer promising new treatment avenues for essential thrombocythemia and primary myelofibrosis.

Keywords:
CALREssential ThrombocythemiaMyelofibrosisMyeloproliferative Neoplasms

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Area of Science:

  • Molecular Biology
  • Hematology
  • Oncology

Background:

  • Calreticulin (CALR) is a crucial chaperone protein involved in protein folding and calcium homeostasis.
  • Mutations in CALR disrupt its function, leading to constitutive activation of the MPL-JAK2-STAT5 pathway.
  • This pathway activation is implicated in the pathogenesis of essential thrombocythemia (ET) and primary myelofibrosis (PMF).

Purpose of the Study:

  • To review the role of CALR mutations in myeloproliferative neoplasms (MPNs).
  • To discuss the biological structure of CALR and its implications.
  • To explore current and emerging therapeutic strategies for CALR-mutated MPNs.

Main Methods:

  • Literature review of studies on CALR mutations in MPNs.
  • Analysis of the biological structure and function of CALR.
  • Examination of current treatment modalities and novel immunotherapeutic approaches.

Main Results:

  • CALR mutations lead to a loss of calcium-binding sites and KDEL sequence, causing aberrant pathway activation.
  • Current treatments focus on symptom management, with allogeneic stem cell transplantation (alloHSCT) as the only curative option.
  • Emerging immunotherapies, including anti-CALR antibodies and T-cell therapies, show potential for treating CALR-mutated MPNs.

Conclusions:

  • CALR mutations are key drivers in ET and PMF pathogenesis.
  • Understanding CALR's structure and function is critical for prognosis and treatment.
  • Targeting mutant CALR via immunotherapy represents a promising frontier for MPN treatment.