Collagen crosslinks in human lumbar intervertebral disc aging

Area of Science:

• Biochemistry
• Biomaterials Science
• Orthopedics

Background:

• Collagen crosslinking influences intervertebral disc biomechanics.
• Altered collagen crosslinks (pyridinoline, pentosidine) are linked to mechanical failure in connective tissues.
• Limited knowledge exists on collagen crosslink changes in aging and degenerating discs.

Purpose of the Study:

• To investigate how collagen crosslinks change in human lumbar intervertebral discs with aging and degeneration.
• To analyze pyridinoline (maturation crosslink) and pentosidine (age-related crosslink) levels.

Main Methods:

• Human lumbar intervertebral discs from 9 individuals (ages 24-89) were analyzed.
• Discs were graded for macroscopic degeneration.
• Collagen crosslinks (pyridinoline, pentosidine) were quantified using HPLC after guanidine extraction and acid hydrolysis.

Main Results:

• Pyridinoline levels decreased with disc aging, a novel finding potentially affecting matrix resilience.
• Pentosidine levels increased with disc aging, consistent with age-related connective tissue deterioration.
• Both pyridinoline and pentosidine levels changed with increasing disc degeneration.

Conclusions:

• Aging and degeneration significantly alter pyridinoline and pentosidine collagen crosslink concentrations in lumbar discs.
• These crosslink alterations may contribute to loss of disc integrity and disc degeneration pathogenesis.