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Author Spotlight: Exploring the Mechanisms of MicroRNA Loading into Extracellular Vesicles in Cancer Progression
Published on: October 6, 2023
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Oncogene-regulated release of extracellular vesicles
Seda Kilinc1, Rebekka Paisner1, Roman Camarda2
1Department of Cell and Tissue Biology, University of California, San Francisco, San Francisco, CA 94143, USA.
Developmental Cell
|June 12, 2021
Summary
Specific oncogenes reduce cancer cell biomass by increasing extracellular vesicle (EV) release. This novel metabolic phenotype involves altered EV composition and function, offering new insights into tumor growth regulation.
Area of Science:
- Oncology
- Cell Biology
- Metabolism
Background:
- Oncogenes significantly impact cancer cell metabolism by influencing anabolic and catabolic pathways.
- The precise mechanisms by which oncogenes regulate overall tumor cell biomass are not fully elucidated.
- Extracellular vesicles (EVs) are increasingly recognized for their role in intercellular communication and cancer progression.
Purpose of the Study:
- To investigate how different oncogenes regulate cancer cell biomass.
- To determine the role of extracellular vesicle (EV) release in oncogene-driven biomass changes.
- To characterize the molecular mechanisms and signaling pathways involved in oncogene-mediated EV production.
Main Methods:
- Utilized isogenic MCF10A cell lines engineered with nine distinct oncogenes.
- Quantified and analyzed the protein and miRNA composition of released EVs.
- Investigated the roles of specific molecules (ceramide, ESCRT) and signaling pathways (RAS/MEK/ERK) in EV release.
- Assessed lysosome gene expression and activity.
Main Results:
- Specific oncogenes, notably MYC and AURKB, were found to reduce cancer cell biomass by significantly increasing EV release.
- Each oncogene demonstrated a unique pattern in altering the protein and miRNA cargo of secreted EVs.
- The study identified distinct requirements for EV release, such as ceramide for MYC and ESCRT for AURKB.
- An inverse correlation between MYC and RAS/MEK/ERK pathway activation was observed in regulating EV release.
- Downregulation of lysosome genes and activity suggests a shift from degradation to EV-mediated release of cellular contents.
Conclusions:
- Oncogene-induced extracellular vesicle (EV) release represents a novel mechanism for regulating tumor cell biomass.
- Differential EV composition and release pathways are dictated by specific oncogenes.
- This oncogene-mediated biomass regulation via EV release offers a new perspective on cancer cell metabolism and potential therapeutic targets.
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