# Discovery of a chemical small molecule inducing umbilical cord mesenchymal stem cell differentiation to vascular endothelial cells

## TL;DR

A new chemical, CPP, was found to efficiently convert umbilical cord stem cells into vascular endothelial cells, which could help in treating vascular diseases.

## Contribution

CPP is a novel small molecule that rapidly induces hUC-MSCs to differentiate into functional vascular endothelial cells.

## Key findings

- CPP-based induction achieved over 90% conversion to functional vascular endothelial cells within 5 days.
- Single-cell RNA sequencing confirmed endothelial-specific molecular signatures during differentiation.
- The long non-coding RNA MEG3 was identified as a key regulator in the CPP-induced differentiation pathway.

## Abstract

Human umbilical cord mesenchymal stem cells (hUC-MSCs) have emerged as promising candidates for clinical applications in vascular disease therapy and in the in vitro modeling of vascular regeneration. However, the translational potential of hUC-MSCs requires direct differentiation into functional vascular lineage cells, particularly vascular endothelial cells (VECs) and endothelial progenitor cells (EPCs). A critical challenge is the lack of reliable sources that yield sufficient quantities of mature VECs/EPCs for therapeutic purposes. To address this limitation, we established an efficient protocol for generating VECs from hUC-MSCs. Preconditioning hUC-MSCs using small molecules with cytoprotective properties can enhance their potential for use in cell-based therapeutics. Through systematic screening, we identified CPP as a novel small chemical molecule that effectively induces the endothelial differentiation of hUC-MSCs. Remarkably, our CPP-based induction protocol achieved > 90% conversion to functionally competent VECs within 5 days, as evidenced by both in vitro assays and in vivo functional validation. Single-cell RNA sequencing (scRNA-seq) analysis further delineated the differentiation trajectory and confirmed the acquisition of endothelial-specific molecular signatures during lineage commitment. These findings establish CPP as a potent inducer of rapid endothelial differentiation, and provide mechanistic insights into stem cell fate determination.

Take home figure CPP drives the differentiation of human umbilical cord mesenchymal stem cells (hUC-MSCs) into functionally competent vascular endothelial cells (VECs). Crucially, the long non-coding RNA MEG3 acts as a pivotal regulator within this differentiation pathway.

The online version contains supplementary material available at 10.1186/s13619-025-00278-2.