Yes, cartilage does contain protein.
Cartilage is a flexible connective tissue found in many areas of the body, including joints, ears, and nose. Its primary function is to provide support and cushioning. A significant component of cartilage is its extracellular matrix, which is largely composed of collagen, a structural protein.
Key Protein Components of Cartilage:
- Collagen: Primarily Type II collagen, which provides tensile strength and structural integrity. It makes up a substantial portion of the cartilage matrix.
- Proteoglycans: These are large molecules composed of a core protein attached to glycosaminoglycans (GAGs). Aggrecan is a major proteoglycan in cartilage. It attracts water, providing the tissue with its compressive resilience.
- Other Proteins: Cartilage also contains other proteins such as chondronectin, which helps chondrocytes (cartilage cells) adhere to the matrix.
Protein-Polysaccharide Complexes:
As indicated in the provided reference, adult chicken cartilage contains a protein-polysaccharide complex that can be extracted using EDTA-sodium chloride. This highlights the intricate interaction between proteins and polysaccharides in the cartilage matrix. The proteins contribute to the structure and function, while polysaccharides provide hydration and flexibility.
In summary, the presence of collagen, proteoglycans, and other proteins is essential for the structural integrity and function of cartilage. These proteins play a critical role in providing cushioning, support, and facilitating smooth joint movement.
