To analyze the transcriptional programs associated with mesenchymal stromal cell (MSC) extracellular vesicles (EVs) in the context of intervertebral disc degeneration (IDD) at single-cell resolution, emphasizing their potential role in immune modulation and tissue repair.
Key Findings:
Seven major cell populations were resolved, with higher EV-program scores in MSCs from IDD tissues, indicating a shift in their functional state.
EV-score–high MSCs exhibited increased signaling and interaction potential, suggesting enhanced roles in immune modulation.
Five hub genes (AP2S1, CSTB, GSTP1, RPL28, TSG101) were prioritized, aligning with immune–metabolic axes, which may serve as targets for future therapies.
AP2S1 and CSTB showed dynamic expression in response to inflammatory stimulation, indicating their potential as biomarkers.
A hub-gene model distinguished IDD from control samples with an AUC of 0.836, demonstrating its predictive power.
Interpretation:
The study identifies an MSC EV–associated program linked to immune signaling and metabolic stress in IDD, highlighting AP2S1 and CSTB as potential biomarkers and therapeutic targets.
Limitations:
The study is based on a limited sample size from scRNA-seq data, which may affect the generalizability of the findings.
Further validation in larger cohorts is needed to confirm findings and address potential biases.
Conclusion:
This research provides insights into MSC EV programs in IDD, suggesting AP2S1 and CSTB as candidate nodes for future investigation, which could lead to novel therapeutic strategies.
With an aging population, spine disorders are becoming increasingly common. Age-related spinal degeneration is nearly universal, but not all patients experience symptoms—and not all degeneration progresses the same way.
