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Chondrocytes (/ ˈ k ɒ n d r ə s aɪ t,-d r oʊ-/, [1] from Greek χόνδρος (chondros) 'cartilage' and κύτος (kytos) 'cell') are the only cells found in healthy cartilage. They produce and maintain the cartilaginous matrix, which consists mainly of collagen and proteoglycans .
Isogenous groups differentiate into individual chondrocytes where they continue to produce and deposit extracellular matrix (ECM), lengthening the cartilage and increasing its diameter. [3] [5] This is termed interstitial growth and is one of only two ways cartilage can grow. [4] Cartoon representation of hyaline cartilage with isogenous groups.
Chondroblasts are called chondrocytes when they embed themselves in the cartilage matrix, consisting of proteoglycan and collagen fibers, until they lie in the matrix lacunae. Once they embed themselves into the cartilage matrix, they grow the cartilage matrix by growing more cartilage extracellular matrix rather than by dividing further.
In humans, MIA3 was first discovered as an important constituent in the growth and adhesion in malignant melanoma cells. As it is secreted from both chondrocytes and melanoma cells, it also plays a role in the metastasis of melanomas as well as cartilage development.
Chondrocytes are inactive cartilage cells, so they don't make cartilage components. The territorial matrix is basophilic (attracts basic compounds and dyes due to its anionic/acidic nature), because there is a higher concentration of proteoglycans, so it will color darker when it's colored and viewed under a microscope.
Spheroids of human autologous matrix-associated chondrocytes, sold under the brand name Spherox, is a medication used to repair defects to the cartilage in the knee in adults who are experiencing knee pain and problems moving the knee. [1] It is used where the affected area is no larger than 10 cm 2 (1.6 sq in). [1]