Do cancer cells sort miRNAs into different EV types?
Two MDA-MB-231 small-EV densities used selective vs non-selective miRNA loading; Lupus La and miR-122 motifs drove selective packaging.
Source
Distinct mechanisms of microRNA sorting into cancer cell-derived extracellular vesicle subtypes
Study at a glance
- Design
- Animal / in-vitro — Density fractionation of MDA-MB-231 sEVs; biochemical/genetic tests of miRNA sorting via Lupus La
- N
- N=2 · Two resolved small-EV density subpopulations (vLD and vHD)
- Population
- Metastatic breast cancer cell line–derived small extracellular vesicles
- Outcome
- Distinct selective vs non-selective miRNA sorting mechanisms; Lupus La/miR-122 motifs
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Inspect source passages
Do cancer cells sort miRNAs into different EV types?
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vLD density 1.09–1.11 g/ml; vHD 1.14–1.16 g/ml.
sEVs with a density ranging from 1.09 to 1.11 g/ml (vLD) may originate in the plasma membrane, whereas the sEVs with a density ranging from 1.14 to 1.16 g/ml (vHD) are more characteristic of exosomes
Two miR-122 motifs for La binding/sorting.
We found that two motifs embedded in miR-122 are responsible for high-affinity binding to Lupus La and sorting into vesicles formed in a cell-free reaction.
What they did
Separated vLD (~1.09–1.11 g/ml) and vHD (~1.14–1.16 g/ml) sEVs and used biochemical/genetic tools plus cell-free packing assays.
What they found
Distinct sorting modes by EV subtype; Lupus La mediates selective miRNAs; two miR-122 motifs enable high-affinity La binding and vesicle sorting.
The limits
What it doesn't show
Cell-line mechanism does not prove in-patient metastasis causation for these sorting routes.
Key terms
- Extracellular vesicles (EVs)
- Secreted membrane vesicles into extracellular space.
- vLD / vHD
- Lower- vs higher-density small EV fractions resolved here.
- Exosomes
- Endocytic-pathway vesicles; vHD more exosome-like.
- Lupus La protein
- RNA-binding protein mediating selective miRNA EV sorting.
- miR-122 motifs
- Sequence elements enabling La binding and selective packing.
- Selective vs non-selective sorting
- Preferential packaging vs abundance mirroring cell lysate.
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Quiz yourself
sEV subtypes resolved:
Common questions
How many sEV subtypes?
Two density subpopulations.
vLD density?
About 1.09–1.11 g/ml.
Selective sorting mediator?
Lupus La protein.
miRNA highlighted?
miR-122 with two motifs.
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