# Extracellular Vesicle Metabolomics Holds Promise for Adult Axon Regeneration

## TL;DR

This review explores how extracellular vesicles could aid in regenerating adult axons, particularly in the optic nerve of the central nervous system.

## Contribution

The paper provides a novel perspective on the role of EV metabolomics in adult axon regeneration and outlines methods for future research.

## Key findings

- EVs may deliver lipids and nucleotides to injury sites, promoting axon regeneration.
- The paper highlights the potential of EVs as a drug delivery platform for CNS repair.
- It emphasizes the importance of metabolite composition in EVs for axonal growth.

## Abstract

Extracellular vesicles (EVs) are bilayer lipid membrane particles that are released by every cell type. These secretions are further classified as exosomes, ectosomes, and microvesicles. They contain biomolecules (RNAs, proteins, metabolites, and lipids) with the ability to modulate various biological processes and have been shown to play a role in intercellular communication and cellular rejuvenation. Various studies suggest exosomes and/or microvesicles as a potential platform for drug delivery. EVs may deliver lipids and nucleotides directly to an injury site in an axon, promoting growth cone stabilization and membrane expansion as well as repair, thus positively modulating adult axon regeneration. In this review, we will provide a perspective on the metabolite composition of EVs in adult axonal regeneration relevant to the central nervous system (CNS), specifically that pertaining to the optic nerve. We will present an overview of the methods for isolation, enrichment, omics data analysis and quantification of extracellular vesicles with the goal of providing direction for future studies relevant to axon regeneration. We will also include current resources for multi-omics data integration relevant to extracellular vesicles from diverse cell types.