Vesicular export opens a new window into living cells

Extracellular vesicle-like particles are tiny biological packages that cells can use to move molecular information from one place to another. In many systems, these vesicles act like messengers, carrying RNA, proteins, or other molecules that reflect what is happening inside the cell. Researchers are now finding ways to engineer this natural communication process for new kinds of biological measurement and cell monitoring.

Researchers researchers at the Institute for Synthetic Biomedicine, Helmholtz Munich and the Technical University of Munich have developed a platform called non-destructive transcriptomics by vesicular export, or NTVE. Instead of breaking cells open to study their internal activity, NTVE uses engineered virus-like particles to export RNA information from living cells into the surrounding culture medium.

The central idea is to make cells release trackable vesicle-like particles that carry molecular readouts from inside the cell. These particles can contain stabilized RNA reporter barcodes or endogenous transcripts, which can then be collected and analyzed. Because the cells remain alive, researchers can return to the same cell population again and again to monitor changes over time.

This approach is especially useful because many important biological processes are dynamic. Stem cells gradually mature into specialized cell types, cells respond to drugs over time, and genetic changes can alter cell behavior in stages. Traditional approaches often require researchers to destroy separate groups of cells at each time point, while NTVE allows repeated sampling from living cells.

A key feature of the system is its engineered vesicular export design. The researchers used virus-like particles with bioorthogonal affinity handles, which make it easier to collect and distinguish exported material from different cell populations. This allows multichannel tracking of co-cultured cells, where multiple cell types can be studied together in the same experiment.

The platform can also export natural RNA transcripts from human and mouse cell lines using an engineered poly(A)-binding protein adapter. These exported vesicular signals closely matched results from conventional cell-lysate methods, showing that the vesicle-based readout can provide meaningful information about cell state.

NTVE also has potential beyond monitoring. By adding fusogens, the vesicle-like particles can deliver mRNA-encoded effectors or ribonucleoprotein gene editors from sender cells to recipient cells. This expands the method into a tool for studying cell-to-cell communication, engineered delivery, and controlled gene activity in mixed cell systems.

One important demonstration involved human induced pluripotent stem cells. The researchers used NTVE to follow differentiation through daily non-destructive profiling, allowing them to track lineage-specific marker changes without disrupting the cells.

Overall, this work shows how engineered extracellular vesicle-like export systems can be used to study living cells in a less destructive and more dynamic way. By turning vesicular export into a biological monitoring platform, NTVE offers a new approach for studying cell behavior, stem cell differentiation, perturbation responses, and intercellular delivery.