New Research: Building Extracellular Vesicles One Protein at a Time

Extracellular vesicles (EV) shuttle signals between cells, carry tumor biomarkers through the bloodstream, and are increasingly attractive as drug-delivery vehicles. But there's a pretty big catch: natural EVs are a heterogenous mess. Even a "pure" preparation from a single cell line contains dozens of subpopulations and hundreds of overlapping surface proteins, making it nearly impossible to say which protein does what. For a field trying to turn EVs into precision therapeutics, this is a huge problem.

In our new paper in ACS Nano, we teamed up with the Tan Lab and Wang Lab at UC Davis to flip the problem upside down. Instead of dissecting complex natural EVs from the top down, we built stripped-down vesicles from the bottom up, essentially one protein at a time. We call this platform VESSEL - Vesicle Engineering Systems using Synthetic Expression and Loading. It uses cell-free protein synthesis developed by Prof. Tan's team to make a chosen protein directly in a tube and display it on a synthetic lipid vesicle. The result is a minimalist EV mimic, or "artificial nanovesicle (ANV)," where we can dial surface chemistry in and out at will.

That control turned out to be pretty powerful. Feeding the pipeline with real EV proteomics data, we systematically asked which surface proteins actually drive EV function. Through this approach we surfaced two less-studied proteins, CADM1 and NPTN, that mediate unusually high-efficiency uptake into recipient cells.

The implications stretch across basic biology and translational medicine. For EV biologists, VESSEL offers something the field has long lacked: a clean way to link a single protein to a single function. For engineers designing therapeutic EVs and lipid nanoparticles, it's a rational route to picking surface ligands that actually get into the right cells.

Sources:

• Link to the paper online: Prototyping Minimal Extracellular Vesicle Mimetics Using Cell-Free Synthesis (ACS Nano, 2026)
• New Platform Allows Researchers to Define Protein Function in Extracellular Vesicles for First Time
• System isolates single extracellular vesicle surface proteins to map function — Phys.org coverage
• New platform allows researchers to define protein function in extracellular vesicles for first time — Exosome RNA

Read the paper here: 

Prototyping Minimal Extracellular Vesicle Mimetics Using Cell-Free Synthesis - ACS Nano 2026.pdf