A novel extracellular matrix-based leukemia model supports leukemia cells with stem cell-like characteristics

Area of Science:

• Biomaterials Science
• Cancer Biology
• Hematology

Background:

• Acute myeloid leukemia (AML) relapse is driven by chemotherapy-resistant, quiescent leukemia stem cells (LSCs).
• The bone marrow microenvironment, including extracellular matrix (ECM), supports LSC quiescence and survival.
• Existing models do not fully replicate the complex ECM interactions influencing LSC behavior.

Purpose of the Study:

• To investigate the potential of decellularized Wharton's jelly matrix (DWJM) as an ECM-based scaffold for modeling AML stem cell-like behavior.
• To assess the impact of DWJM on leukemia cell proliferation, differentiation, morphology, and chemotherapy sensitivity.

Main Methods:

• Leukemia cells were cultured in DWJM, a scaffold derived from umbilical cord Wharton's jelly.
• Assessed proliferation, differentiation, morphology (spindle-shaped appearance), and ALDH+ population.
• Evaluated apoptosis resistance to doxorubicin and colony-forming ability (CFU assays).
• Measured N-cadherin expression via flow cytometry.

Main Results:

• Leukemia cells in DWJM showed reduced proliferation and increased ALDH+ population without significant differentiation.
• Cells cultured in DWJM exhibited a spindle-shaped morphology and enhanced resistance to doxorubicin-induced apoptosis.
• DWJM culture increased leukemia cell colony-forming ability and N-cadherin expression.

Conclusions:

• DWJM effectively mimics aspects of the bone marrow ECM, promoting stem cell-like characteristics in leukemia cells.
• DWJM serves as a valuable ECM-based model for studying AML stem cell behavior and chemoresistance.
• This model can aid in understanding LSC survival mechanisms and developing novel therapeutic strategies.