Abstract
Mice with hereditary kyphoscoliosis (ky/ky) develop intervertebral-disc degeneration at the cervico-thoracic junction. Disc proteoglycans were investigated to determine whether changes in synthesis or structure were associated with this. Elevated 35S-proteoglycan synthesis was found in one or more cervico-thoracic discs in 80-day-old ky/ky mice. The hydrodynamic size and aggregation properties of ky/ky-mouse disc 35S-proteoglycans extracted with 4 M-guanidinium chloride were normal. Increased proportions of small 35S-proteoglycans were extracted with 0.5 M-guanidinium chloride from discs of normal and ky/ky mice with increasing age.
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