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Human intervertebral disc acid glycosaminoglycans.
J R Taylor1, J E Scott, A M Cribb
1Department of Anatomy and Human Biology, University of Western Australia, Nedlands.
Journal of Anatomy
|February 1, 1992
Summary
Alcian blue critical electrolyte concentration staining reveals glycosaminoglycan sulphation increases during disc maturation until age 10, then stabilizes. This finding challenges the view that these changes are due to aging.
Area of Science:
- Biochemistry
- Histology
- Orthopedics
Background:
- Intervertebral disc composition changes with age.
- Glycosaminoglycan sulphation is a key factor in disc health.
- Current understanding links disc changes primarily to degeneration in old age.
Purpose of the Study:
- To investigate age-related changes in glycosaminoglycan sulphation in intervertebral discs.
- To correlate Alcian blue critical electrolyte concentration (CEC) staining with age groups.
- To challenge existing theories on disc degeneration.
Main Methods:
- Alcian blue critical electrolyte concentration (CEC) staining was used.
- Intervertebral discs (cervical, thoracic, lumbar) were analyzed.
- CEC staining was correlated with three age groups: <3 months, 3 months-5 years, and >10 years.
Main Results:
- CEC staining, indicating glycosaminoglycan sulphation, increased significantly from fetal life to 10 years.
- CEC remained constant in adulthood, contradicting age-related degenerative change theories.
- The majority of CEC increase occurred post-vascularization (by 4 years).
Conclusions:
- Glycosaminoglycan sulphation in intervertebral discs is primarily a maturational process, not degenerative.
- The findings support a hypothesis of keratan sulphate functionally replacing chondroitin sulphate in low-oxygen environments.
- Disc maturation involves significant sulphation changes before old age.