Collagen fibril

Collagen fibrils are highly organized, supramolecular assemblies that serve as the primary structural component of the vertebrate extracellular matrix (ECM) [4, 13]. They are composed of triple-helical collagen molecules—most commonly types I, II, III, V, and XI—which self-assemble into cable-like structures that provide essential tensile strength and mechanical support to tissues such as skin, bone, and tendons [16, 18]. Beyond their mechanical role, these fibrils act as biological scaffolds that facilitate cell adhesion, migration, and tissue repair through interactions with cell-surface receptors like integrins and discoidin domain receptors [14, 16]. Pathologically, the dysregulated synthesis and excessive cross-linking of collagen fibrils are central to the development of fibrotic diseases, leading to progressive organ stiffening and dysfunction in conditions such as idiopathic pulmonary fibrosis and systemic sclerosis [4, 10, 22]. Furthermore, in oncology, the remodeling of collagen fibrils in the tumor microenvironment can create a physical barrier to immune infiltration and drug delivery while actively promoting tumor cell invasion [8, 24]. Therapeutic strategies include the direct use of collagenases to degrade pathological fibrils in localized conditions like Dupuytren's contracture, as well as the development of inhibitors targeting collagen synthesis or enzymatic cross-linking to treat systemic fibrotic disorders [8, 10, 21].

Other names

Fibrillar collagenCollagen fiberType I collagen fibrilType III collagen fibrilExtracellular matrix fibril

Direct enzymatic proteolysis (degradation) of existing collagen fibrils; inhibition of collagen biosynthesis via TGF-beta pathway blockade; inhibition of lysyl oxidase (LOX) to prevent fibril cross-linking and stabilization; inhibition of procollagen propeptide cleavage by BMP-1/tolloid-like proteinases to prevent fibril assembly.