Age- and gender-related changes in ligament components.

The age- and gender-related changes in extracellular matrix components (elastin, elastin cross-links, fibrillin, collagen and glycoprotein) and mineral components (calcium, Ca; phosphorus, P) in human lumbar yellow ligaments were investigated using samples obtained from surgical specimens. The mineral (Ca and P) contents increased with ageing (r = 0.703 and r = 0.772, respectively), whereas the contents of matrix components tended to decrease with ageing (elastin r = -0.261, elastin cross-links r = -0.213, fibrillin r = 0.494; collagen r = -0.322 and glycoprotein r = -0.143). Comparison of the male and female groups revealed that the ligament elastin content and elastin cross-links decreased in the male group, whereas the ligament collagen content decreased in the female group significantly in an age-dependent manner (r = -0.788, r = -0.753 and r = -0.721, respectively). These findings demonstrate age- and gender-related changes in mineral and matrix components (especially elastin and collagen) in the lumbar yellow ligaments in the Japanese population. It is suggested that elastin and collagen metabolism in ligaments changes both with age and according to gender.