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The E3 protein ubiquitin ligase Itch is a potential target in myeloid malignancies with marrow fibrosis

Shuang Han1, Yao Zhang1, Cha Guo1

  • 1Department of Hematology, Shanghai Sixth People's Hospital East Affiliated to Shanghai University of Medicine & Health Sciences, Shanghai, China.

Translational Cancer Research
|February 4, 2022
PubMed
Abstract

Insights

The E3 ubiquitin ligase Itch may contribute to myeloid malignancies like myelodysplastic syndrome and acute myeloid leukemia by influencing proliferation and fibrosis. Its expression increases with higher white blood cell counts in these diseases.

Area of Science:

  • Hematology
  • Oncology
  • Molecular Biology

Background:

  • The mechanisms driving myeloid malignancies, including myelodysplastic syndrome (MDS) and acute myeloid leukemia (AML) with bone marrow fibrosis, remain unclear.
  • This study investigates the preliminary role of the E3 protein ubiquitin ligase Itch in the pathogenesis of these conditions.

Purpose of the Study:

  • To explore the potential involvement of the E3 ubiquitin ligase Itch in myeloid malignancies.
  • To investigate the relationship between the phosphatidylinositol 3-kinase (PI3K)/Akt pathway and Itch expression in myeloid neoplasms.

Main Methods:

  • Bioinformatic analysis to identify potential roles of Itch and the PI3K/Akt pathway.
  • In vitro experiments using the K562 myeloid neoplasm cell line to assess PI3K/Akt regulation of Itch and p73.
  • Quantitative analysis of Itch mRNA levels in clinical samples from various myeloid disease subgroups.

Main Results:

  • The PI3K/Akt pathway did not appear to regulate Itch or its substrate p73 in the K562 cell line.
  • Itch mRNA levels were significantly elevated in patients with high-risk MDS, AML, fibrosis, and higher white blood cell (WBC) counts compared to controls.
  • Itch mRNA levels showed a positive correlation with WBC count but no significant difference based on karyotype.

Conclusions:

  • The PI3K/Akt pathway is unlikely involved in regulating Itch expression in myeloid tumors.
  • Itch may play a significant role in both the proliferation and fibrosis development characteristic of myeloid malignancies.
Keywords:
E3 protein ubiquitin ligaseItchPhosphatidylinositol 3-kinase (PI3K)/Akt pathwaybone marrow (BM) fibrosismyeloid malignancies

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