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Herniated Intervertebral Disc l: Introduction

Herniated Intervertebral Disc l: Introduction

Intervertebral disc herniation refers to the displacement of the nucleus pulposus (the gel-like inner core of the disc) through a tear or weakened area in the annulus fibrosus (the outer fibrous ring). The displaced disc material extends beyond the normal boundaries of the disc space and may compress or irritate nearby spinal nerve roots or, less commonly, the spinal cord.Etiology and Risk FactorsHerniation commonly results from degeneration, in which aging reduces disc hydration and...

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Degenerative disc disease is a chronic condition in which intervertebral discs gradually lose structure and function. It is not infectious or autoimmune; rather, it results from age-related biochemical and mechanical changes, influenced by genetic, metabolic, and environmental factors.Structure and Function of DiscsThe spine contains 23 intervertebral discs that absorb load, distribute forces, maintain spacing, and allow flexibility. Each disc consists of a nucleus pulposus, a gel-like core...

Degenerative Disc Disease ll: Pathophysiology

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The symptoms of degenerative disc disease arise from a combination of mechanical compression, vascular compromise, and biochemical inflammation, which together disrupt nerve function and produce pain.Mechanical CompressionDisc degeneration reduces height and elasticity, predisposing to herniation of the nucleus pulposus, a major cause of radicular pain. Herniations may be protrusion (bulging with intact annulus), extrusion (nucleus extends beyond disc but remains connected), or sequestration...

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Related Experiment Video

Updated: May 7, 2026

Optical Sectioning and Visualization of the Intervertebral Disc from Embryonic Development to Degeneration

Optical Sectioning and Visualization of the Intervertebral Disc from Embryonic Development to Degeneration

Published on: July 8, 2021

Single-nucleus transcriptomics decodes the link between aging and lumbar disc herniation.

Min Wang^1,2, Zan He^3,4, Anqi Wang^5,6

¹State Key Laboratory of Organ Regeneration and Reconstruction, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China.

|March 22, 2025

Summary

This summary is machine-generated.

Cellular senescence and reduced nucleus pulposus progenitor cells (NPPCs) drive lumbar disc (LD) aging and herniation. Increased NFAT1 expression exacerbates NPPC senescence, contributing to LD pathology.

Keywords:

NFAT1 aging herniation nucleus pulposus senescence single-nucleus transcriptomics

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Area of Science:

Biomedical Science
Cellular Biology
Aging Research

Background:

Lumbar disc (LD) herniation and aging are common causes of significant morbidity.
Understanding the molecular mechanisms linking LD aging and herniation is crucial for developing effective treatments.

Purpose of the Study:

To investigate the cellular and molecular changes in the nucleus pulposus (NP) associated with LD aging and herniation.
To identify key factors contributing to NP cell senescence and dysfunction.

Main Methods:

Histological analysis of NP samples from a diverse cohort.
Single-nucleus RNA sequencing to profile molecular alterations.
Correlation of cellular senescence and NP progenitor cell (NPPC) populations with age and herniation status.

Main Results:

Cellular senescence and a decrease in NPPCs are identified as central mechanisms in both LD aging and herniation.
An age-related increase in NFAT1 expression was observed.
NFAT1 promotes NPPC senescence, contributing to LD aging and herniation.

Conclusions:

Cellular senescence and NPPC depletion are key drivers of LD aging and herniation.
NFAT1 plays a significant role in promoting NPPC senescence and LD pathology.
These findings provide novel insights into LD aging and herniation, suggesting potential therapeutic targets.