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Modeling Chemotherapy Resistant Leukemia In Vitro
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GAP JUNCTION FUNCTION IS ESSENTIAL FOR SURVIVAL OF ACUTE LYMPHOBLASTIC LEUKEMIA CELLS
E Edwards1, D Schenone1, U Sivagnanalingam1
1Division of Pediatric Hematology/Oncology, University of Rochester School of Medicine and Dentistry, Rochester, New York, USA.
Experimental Oncology
|October 13, 2024
Summary
Gap junctions between leukemia and stromal cells are crucial for acute lymphoblastic leukemia survival. Inhibiting these junctions impairs leukemia cell survival, suggesting new therapeutic targets.
Area of Science:
- Hematology
- Cell Biology
- Cancer Research
Background:
- Nonmalignant bone marrow stromal cells intimately support acute lymphoblastic leukemia (ALL) survival.
- Stromal cells facilitate ALL cell survival through bidirectional intracellular material transfer.
- Understanding stromal support mechanisms is key to developing novel ALL therapies.
Purpose of the Study:
- To investigate the formation of gap junctions between ALL and stromal cells.
- To determine if gap junction function is essential for ALL cell survival.
- To explore gap junction inhibitors as a potential therapeutic strategy for ALL.
Main Methods:
- Utilized an in vitro model of human bone marrow stromal cells and primary human B lymphoblastic leukemia cells.
- Assessed leukemia cell survival in coculture using flow cytometry.
- Evaluated the impact of gap junction inhibitors (peptides, carbenoxolone) and chemotherapy drugs on leukemia cell survival.
Main Results:
- Stromal cell viability and metabolic activity are essential for supporting ALL cell survival.
- Physical contact between ALL and stromal cells increases gap junction protein expression in leukemia cells.
- Gap junction inhibition via peptides or carbenoxolone significantly impaired ALL cell survival.
- Carbenoxolone showed a modest enhancement of methotrexate efficacy but no significant interaction with other tested chemotherapy drugs.
Conclusions:
- Interference with gap junction function demonstrably impairs acute lymphoblastic leukemia cell survival.
- Targeting gap junctions represents a promising novel therapeutic avenue for ALL treatment.
- Further development of gap junction-targeting drugs could offer new strategies against ALL.
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