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Humans Have Salamander-Like Ability to Regrow Cartilage in Joints

Kraus and colleagues, including lead author Ming-Feng Hsueh, Ph.D., devised a way to determine the age of proteins using internal molecular clocks integral to amino acids, which convert one form to another with predictable regularity.

Newly created proteins in tissue have few or no amino acid conversions; older proteins have many. Understanding this process enabled the researchers to use sensitive mass spectrometry to identify when key proteins in human cartilage, including collagens, were young, middle-aged or old.

They found that the age of cartilage largely depended on where it resided in the body. Cartilage in ankles is young, it’s middle-aged in the knee and old in the hips. This correlation between the age of human cartilage and its location in the body aligns with how limb repair occurs in certain animals, which more readily regenerate at the furthest tips, including the ends of legs or tails.

Link: Humans Have Salamander-Like Ability to Regrow Cartilage in Joints | Duke Health