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Updated: Jun 19, 2025
10:09
Characterization of Immune Cell-derived Extracellular Vesicles and Studying Functional Impact on Cell Environment
Published on: June 2, 2020
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Chronic Lymphocytic Leukemia (CLL)-Derived Extracellular Vesicles Educate Endothelial Cells to Become IL-6-Producing,
Orit Uziel1,2,3, Lian Lipshtein1,3, Zinab Sarsor1,2
1The Felsenstein Medical Research Center, Rabin Medical Center Petah-Tikva, Petah Tikva 49100, Israel.
Biomedicines
|July 27, 2024
Summary
Chronic lymphocytic leukemia (CLL) cells release extracellular vesicles (EVs) that transform endothelial cells into IL-6 producers. This process activates STAT3, reducing CLL cell apoptosis and promoting disease progression.
Area of Science:
- Hematology
- Cell Biology
- Cancer Research
Background:
- Chronic lymphocytic leukemia (CLL) is a B-cell malignancy where the tumor microenvironment plays a crucial role.
- Extracellular vesicles (EVs) mediate intercellular communication and are implicated in cancer progression.
- Endothelial cells form the blood vessel lining and interact with circulating leukemia cells.
Purpose of the Study:
- To investigate whether CLL-derived EVs induce endothelial cells to support CLL cell survival.
- To elucidate the molecular mechanisms by which CLL EVs alter endothelial cell function.
- To determine the role of IL-6 and β-catenin in this interaction.
Main Methods:
- EVs were isolated from CLL patient peripheral blood and characterized.
- Endothelial cells (HUVECs, HAOECs) were treated with CLL-derived EVs.
- IL-6 levels were measured by ELISA.
- STAT3 phosphorylation and apoptosis rates were assessed.
- Phospho-proteomics and network analysis were performed.
- β-catenin transfection and chromatin immunoprecipitation assays were conducted.
Main Results:
- CLL-EVs were internalized by endothelial cells in a dose- and time-dependent manner.
- CLL-EVs significantly increased IL-6 production by endothelial cells (50% increase).
- IL-6 in the conditioned medium reduced CLL cell apoptosis by 40% via STAT3 activation.
- Phospho-proteomics identified upregulated phospho-proteins, highlighting phospho-β-catenin.
- β-catenin transfection increased IL-6 production by 30% and enhanced transcription factor binding to the IL-6 promoter.
- CLL patients exhibited higher peripheral blood IL-6 levels than healthy individuals.
Conclusions:
- CLL cells communicate with endothelial cells via EVs.
- CLL-EVs reprogram endothelial cells to produce IL-6.
- This IL-6 promotes CLL cell survival through the STAT3 anti-apoptotic pathway.
- β-catenin is a key mediator in the CLL EV-induced IL-6 production.
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