Cartilage keratan sulphate: changes in chain length with ageing

Area of Science:

• Biochemistry
• Biomaterials Science
• Aging Research

Background:

• Keratan sulphate is a key glycosaminoglycan in cartilage.
• Understanding its structural changes with age is crucial for cartilage health.
• Previous studies have not fully elucidated age-related alterations in keratan sulphate chain length.

Purpose of the Study:

• To investigate the changes in keratan sulphate chain length in sheep nasal cartilage across different ages.
• To determine if increased keratan sulphate content is due to chain elongation or increased chain number.

Main Methods:

• Isolation of keratan sulphate from sheep nasal cartilage using a combination of biochemical methods.
• Assessment of mean chain length using the molar ratio of glucosamine to galactosamine or galactosaminitol.

Main Results:

• Keratan sulphate was successfully isolated from cartilage of sheep aged five different ages.
• The mean length of keratan sulphate chains progressively increased with age.
• Chain length ranged from approximately eight monosaccharides in younger sheep to seventeen in older sheep.

Conclusions:

• The increase in keratan sulphate content in aging cartilage is primarily attributed to an increase in the length of existing chains.
• This finding suggests a mechanism of cartilage structural modification during aging.
• Further research can explore the functional implications of elongated keratan sulphate chains in aged cartilage.