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Related Experiment Video

Updated: Dec 25, 2025

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

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Ciliary IFT80 is essential for intervertebral disc development and maintenance.

Xinhua Li1,2, Shuting Yang1, Lin Han3

  • 1Department of Basic and Translational Science, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, USA.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|April 1, 2020
PubMed
Summary
This summary is machine-generated.

Intervertebral disc degeneration (IVDD) is common, but its cellular mechanisms are unclear. This study reveals intraflagellar transport 80 (IFT80) protein

Keywords:
IFT80annulus fibrosusintervertebral disc degenerationnucleus pulposusprimary cilia

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Last Updated: Dec 25, 2025

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Regenerative Medicine

Background:

  • Intervertebral disc degeneration (IVDD) affects over 90% of individuals over 50, with limited understanding of its cellular mechanisms and effective treatments.
  • Primary cilia, microtubule-based organelles crucial for development, and intraflagellar transport (IFT) proteins' roles in intervertebral disc (IVD) health are largely unknown.

Purpose of the Study:

  • To investigate the role of primary cilia and the intraflagellar transport 80 (IFT80) protein in the development, maintenance, and degeneration of the intervertebral disc (IVD).
  • To elucidate the molecular mechanisms underlying IVD degeneration involving IFT80 and its impact on cell survival and signaling pathways.

Main Methods:

  • Utilized cilia-GFP mice to visualize cilia presence and length in different IVD regions (growth plate, cartilage endplate, annulus fibrosus, nucleus pulposus).
  • Generated conditional knockout mouse models (IFT80fl/fl; Col2-creERT and IFT80fl/fl; Col1-creERT) to assess the impact of IFT80 deletion in specific cell populations.
  • Performed mechanistic analyses including cell apoptosis assays, gene expression analysis of chondrogenic markers and hedgehog (Hh) signaling components, and rescue experiments using Smoothened agonist (SAG).

Main Results:

  • Cilia were present in various IVD regions, with decreased length during degeneration and increased numbers during repair in the annulus fibrosus.
  • IFT80 deletion in type II collagen-positive cells disrupted IVD structure, reduced chondrogenic markers, and impaired Hh signaling.
  • IFT80 deletion in type I collagen-positive cells disorganized the outer annulus fibrosus and decreased Hh signaling components; SAG treatment rescued cell proliferation and osteogenic differentiation.

Conclusions:

  • Ciliary IFT80 is critical for maintaining IVD cell organization and function, impacting cell survival and the hedgehog signaling pathway.
  • Understanding IFT80's role provides insights into IVDD pathogenesis and potential therapeutic targets for treating disc degeneration.