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

Temoche-Diaz MM, Shurtleff MJ, Nottingham RM, et al. · eLife · 2019

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

Structured fields used in claim comparison tables when every cited study has a complete layer.

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.

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

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.

1 / 8

Research intelligence for this paper

See its role on concept claims, tensions it is part of, placement history, and related discoveries.

1 / 5

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.