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CCN3--a key regulator of the hematopoietic compartment

L McCallum1, A E Irvine

  • 1Centre for Cancer Research and Cell Biology, Queens University Belfast, Belfast, UK. l.gilmour@qub.ac.uk

Blood Reviews
|August 30, 2008
PubMed

Insights

CCN3 (Cell-Cycle Controller 3) is vital for stem cell regulation and hematopoiesis. Its altered expression impacts various cancers and bone development, highlighting its role in the bone marrow microenvironment.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Oncology
  • Hematology

Background:

  • CCN3, a member of the CCN family of growth regulators, was identified in human serum in 2003.
  • It is expressed and secreted by hematopoietic progenitor cells in normal bone marrow.
  • CCN3 interacts with core stem cell signaling pathways like Notch and Bone Morphogenic Protein.

Purpose of the Study:

  • To elucidate the role of CCN3 in stem cell regulation, hematopoiesis, and its association with various cancers.
  • To understand how CCN3 influences the self-renewal and maturation of hematopoietic, osteogenic, and chondrogenic cell lineages.
  • To investigate the impact of disrupted CCN3 expression in diseases like Chronic Myeloid Leukemia and solid tumors.

Main Methods:

  • Analysis of CCN3 expression in normal bone marrow hematopoietic progenitor cells.
  • Investigation of CCN3's interaction with Notch and Bone Morphogenic Protein signaling pathways.
  • Examination of CCN3 expression alterations in Chronic Myeloid Leukemia and various solid tumors (glioblastoma, melanoma, etc.).
  • Study of CCN3's effect on naïve cord blood progenitors' clonal expansion.
  • Analysis of mature and truncated CCN3 protein variants in cancer.

Main Results:

  • CCN3 modulates self-renewal and maturation of hematopoietic, osteogenic, and chondrogenic cells.
  • CCN3 expression is disrupted in Chronic Myeloid Leukemia due to the BCR-ABL oncogene, enabling leukemic evasion of growth regulation.
  • Naïve cord blood progenitors show enhanced clonal expansion in response to CCN3.
  • Altered CCN3 expression is linked to numerous solid tumors and bone malignancies, including osteosarcoma.
  • Truncated CCN3 protein variants with altered functions are observed in many cancers.

Conclusions:

  • CCN3 is a key regulator of stem cell function, hematopoiesis, and the bone marrow microenvironment.
  • CCN3's function is cell type and isoform specific, with disruptions contributing to oncogenesis.
  • Understanding CCN3's role offers potential therapeutic avenues for hematological malignancies and solid tumors.

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