Answer
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As bones age, changes occur in the organic part of the bone extracellular matrix, which is composed primarily of collagen and proteoglycans. Some of the changes that occur include:
1. Reduced collagen synthesis: With aging, there is a decrease in the synthesis of collagen, which is the main protein in bone. This reduction in collagen production can lead to a decrease in bone strength and flexibility.
2. Changes in collagen cross-linking: Collagen fibers in bone are cross-linked to increase their strength and resistance to breakage. With aging, the pattern of collagen cross-linking changes, leading to a decrease in bone strength and an increased risk of fractures.
3. Changes in proteoglycan content: Proteoglycans are molecules that help to maintain the structure of the bone extracellular matrix. With aging, there is a reduction in the amount of proteoglycans in bone, which can lead to a decrease in bone strength and flexibility.
4. Accumulation of advanced glycation end products (AGEs): AGEs are compounds that form when sugars react with proteins in the body. With aging, there is an accumulation of AGEs in bone tissue, which can lead to changes in the structure and function of the bone extracellular matrix.
Overall, these changes in the organic part of the bone extracellular matrix with aging can lead to a decrease in bone strength and an increased risk of fractures. Maintaining a healthy diet, regular exercise, and avoiding lifestyle factors that contribute to bone loss can help to slow down these changes and maintain healthy bones as we age.
