Collagen alpha-1(II) chain (COL2A1) (COL2A1)

Collagen alpha-1(II) chain (COL2A1) is the primary structural protein of the extracellular matrix in articular cartilage, providing the essential tensile strength and framework required for joint function [UniProt: P02458]. It forms a dense fibrillar network that traps proteoglycans, enabling cartilage to resist compressive forces and maintain skeletal integrity during development [PubMed: 28231546]. In degenerative diseases like osteoarthritis, the breakdown of this collagen network by matrix metalloproteinases is a defining step in cartilage degradation [StatPearls: NBK541074]. Additionally, type II collagen is a major autoantigen in rheumatoid arthritis, where its exposure can trigger inflammatory immune responses that further damage the joint [PubMed: 11074610]. Therapeutic strategies targeting this molecule include the use of undenatured type II collagen (UC-II) to induce oral tolerance and reduce autoimmune-driven joint destruction [PubMed: 26822714]. Clinical monitoring of collagen II turnover often utilizes biomarkers such as the C-terminal telopeptide of type II collagen (CTX-II) to track disease progression and therapeutic efficacy [PubMed: 15593140].

Other names

Collagen type II alpha 1Alpha-1 type II collagenChondrocalcinCOL2A1

Induction of oral tolerance via regulatory T-cell activation to suppress autoimmune joint destruction; provision of structural scaffolding for cartilage regeneration; and stimulation of chondrocyte-mediated extracellular matrix synthesis.