Related Experiment Video
Updated: Aug 4, 2025
Optical Sectioning and Visualization of the Intervertebral Disc from Embryonic Development to Degeneration
Published on: July 8, 2021
Spatially multicellular variability of intervertebral disc degeneration by comparative single-cell analysis
Peng Lin1, Pulin Yan1, Jun Zhu1
1Department of Spine Surgery, Center of Orthopedics, State Key Laboratory of Trauma, Burns and Combined Injury, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, 400042, China.
Insights
Cellular changes in the intervertebral disc (IVD) during degeneration were mapped using single-cell RNA sequencing. Specific cell populations like StressCs, HomCs, and RegCs showed altered frequencies and functions in intervertebral disc degeneration (IDD).
Area of Science:
- Biomedical Sciences
- Cell Biology
- Regenerative Medicine
Background:
- Intervertebral disc degeneration (IDD) is a significant cause of back pain.
- Cellular heterogeneity within intervertebral discs (IVDs) is known, but alterations during degeneration are not fully understood.
Purpose of the Study:
- To elucidate the cellular and molecular changes in goat IVD cells during degeneration.
- To identify key cell populations and regulatory networks involved in IDD.
Main Methods:
- Single-cell RNA sequencing (scRNA-seq) was performed on cells from healthy and degenerative goat IVDs across four anatomic sites.
- Bioinformatic analysis was used to identify cell clusters, their frequencies, and molecular signatures.
Main Results:
- Identified distinct cell populations: EGLN3+ StressCs (stress resistance), TGFBR3+ HomCs (homeostasis), and GPRC5A+ RegCs (repair).
- Observed fluctuations in these cell cluster frequencies and signatures with IDD progression.
- Found altered chondrogenic differentiation in PROCR+ progenitor cells and stemness exhaustion in notochord cells during IDD.
- Characterized CAV1+ endothelial cells interacting with chondrocytes via signaling pathways in degenerative IVDs.
Conclusions:
- IDD involves significant shifts in IVD cellular composition and function.
- Specific cell populations and their molecular pathways are critically altered during IDD.
- This study provides a foundation for understanding IDD pathogenesis and developing targeted therapeutic strategies.
Abstract:
Previous studies have revealed cellular heterogeneity in intervertebral discs (IVDs). However, the cellular and molecular alteration patterns of cell populations during degenerative progression remain to be fully elucidated. To illustrate the cellular and molecular alteration of cell populations in intervertebral disc degeneration (IDD), we perform single cell RNA sequencing on cells from four anatomic sites of healthy and degenerative goat IVDs. EGLN3+ StressCs, TGFBR3+ HomCs and GPRC5A+ RegCs exhibit the characteristics associated with resistance to stress, maintaining homeostasis and repairing, respectively. The frequencies and signatures of these cell clusters fluctuate with IDD. Notably, the chondrogenic differentiation programme of PROCR+ progenitor cells is altered by IDD, while notochord cells turn to stemness exhaustion. In addition, we characterise CAV1+ endothelial cells that communicate with chondrocytes through multiple signalling pathways in degenerative IVDs. Our comprehensive analysis identifies the variability of key cell clusters and critical regulatory networks responding to IDD, which will facilitate in-depth investigation of therapeutic strategies for IDD.
