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Updated: May 28, 2026
10:09
Characterization of Immune Cell-derived Extracellular Vesicles and Studying Functional Impact on Cell Environment
Published on: June 2, 2020
Chronic Lymphocytic Leukemia (CLL)-Derived Extracellular Vesicles (EVs) Modulate Monocytes to Become CLL-Supportive
Shaked Noah1, Einat Be'ery1, Zinab Sarsor1
1The Felsenstein Medical Research Center, Rabin Medical Center, Petah Tikva 4941492, Israel.
International Journal of Molecular Sciences
|May 27, 2026
Summary
Chronic lymphocytic leukemia (CLL) cells release exosomes that transform monocytes into IL-6 producers, promoting cancer cell survival and disease progression. This creates a communication loop benefiting the leukemia.
Area of Science:
- Hematology
- Oncology
- Cell Biology
Background:
- Chronic lymphocytic leukemia (CLL) is a B-cell malignancy.
- Leukemia cells may interact with other blood cells to promote survival.
- Exosomes are key mediators of intercellular communication.
Purpose of the Study:
- To investigate if CLL cells recruit monocytes via exosomes for survival advantage.
- To determine the molecular mechanisms of CLL-monocyte interaction.
Main Methods:
- Monocytes were treated with exosomes from CLL patients.
- IL-6 production by monocytes was measured.
- Phosphoprotein analysis was performed on exposed monocytes.
- Monocyte-to-fibroblast transformation was assessed.
Main Results:
- CLL exosomes increased monocyte IL-6 production by 13-fold.
- STAT3 phosphorylation was observed in CLL cells cultured with IL-6-enriched medium.
- 67 phosphoproteins were upregulated in monocytes, including TFIIF.
- CLL exosomes induced monocyte transformation into nurse-like fibrocytes (45% vs. 30%).
Conclusions:
- CLL cells communicate with monocytes through exosomes.
- Exosomes induce monocytes to produce IL-6, enhancing CLL cell survival.
- This interaction creates a pro-leukemia microenvironment, driving disease progression.
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