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Related Experiment Video

Updated: Feb 3, 2026

Optical Sectioning and Visualization of the Intervertebral Disc from Embryonic Development to Degeneration
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Runx2 is required for postnatal intervertebral disc tissue growth and development.

Lifan Liao1,2, Hua Jiang1, Yunshan Fan1,3

  • 1Department of Orthopedic Surgery, Rush University Medical Center, Chicago, Illinois.

Journal of Cellular Physiology
|October 21, 2018
PubMed
Summary

Runt-related transcription factor 2 (Runx2) deletion in postnatal mice impacts intervertebral disc development. Runx2 deficiency leads to notochordal cell accumulation and altered Indian hedgehog signaling in disc tissues.

Keywords:
Indian hedgehog (Ihh)growth plate (GP) cartilageintervertebral disc (IVD)notochordal cellsrunt-related transcription factor 2 (Runx2)

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Area of Science:

  • Developmental Biology
  • Skeletal Biology
  • Cell Biology

Background:

  • Runt-related transcription factor 2 (Runx2) is crucial for embryonic skeletal development.
  • The role of Runx2 in postnatal intervertebral disc (IVD) development remains largely undefined.
  • Understanding Runx2's function in mature disc tissue is vital for regenerative medicine and treating disc degeneration.

Purpose of the Study:

  • To investigate the function of Runx2 in postnatal IVD growth and development.
  • To determine the impact of Runx2 deletion in Aggrecan-expressing cells on disc tissue homeostasis.
  • To explore the relationship between Runx2 and Indian hedgehog (Ihh) signaling in the postnatal IVD.

Main Methods:

  • Generation of Runx2 conditional knockout mice (Runx2Agc1ER) with postnatal deletion at 2 weeks.
  • Histological and immunohistochemical analysis of IVD tissues in 3-month-old wild-type and knockout mice.
  • Quantitative assessment of notochordal cell populations, growth plate cartilage thickness, and Ihh expression levels.

Main Results:

  • Runx2 deletion resulted in the accumulation of large vacuolated notochordal cells in the nucleus pulposus (NP).
  • A significant thickening of growth plate cartilage tissue was observed in the intervertebral discs of Runx2 knockout mice.
  • Indian hedgehog (Ihh) expression was significantly upregulated in NP and annulus fibrosus cells of Runx2 knockout mice.

Conclusions:

  • Runx2 plays a critical role in the postnatal development and maintenance of intervertebral disc tissue.
  • Runx2 deficiency in Aggrecan-expressing cells disrupts normal disc cellularity and cartilage development.
  • Runx2 may regulate postnatal disc development, at least in part, through interaction with the Ihh signaling pathway.