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Tough bundles of collagen called collagen fibers are a major component of the extracellular matrix that supports most tissues and gives cells structure from the outside, but collagen is also found inside certain cells. Collagen has great tensile strength, and is the main component of fascia, cartilage, ligaments, tendons, bone and skin.
Type II collagen is the basis for hyaline cartilage, including the articular cartilages at joint surfaces. It is formed by homotrimers of collagen, type II, alpha 1 chains. It makes up 50% of all protein in cartilage and 85–90% of collagen of articular cartilage. Type II collagen is organised into fibrils.
Collagen, type I, alpha 1, also known as alpha-1 type I collagen, is a protein that in humans is encoded by the COL1A1 gene. COL1A1 encodes the major component of type I collagen , the fibrillar collagen found in most connective tissues , including cartilage .
As a result, cells make a reduced amount of type II collagen. Instead of forming collagen molecules, the abnormal pro-alpha1(II) chains build up in cartilage cells (chondrocytes). These changes disrupt normal bone development, resulting in flattened vertebrae, short fingers and toes, and the other features of spondyloperipheral dysplasia.
Perichondrium can be found around the perimeter of elastic cartilage and hyaline cartilage. Perichondrium is a type of irregular collagenous ordinary connective tissue, and also functions in the growth and repair of cartilage. Perichondrium contains type I collagen [1] and type XII collagen. [2]
Similarly, collagen fibers are aligned perpendicular to the surface in the deep zone in order to restrict compressive forces. [5] Between bone and the deep zone lies calcified cartilage. Cell arrangement also varies between the zones, in deeper zones chondrocytes are stacked into columns while in the superficial zones they are arranged randomly ...
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