Decorin

Decorin is a small leucine-rich repeat protein (SLRP) that is part of the extracellular matrix (ECM). It is encoded by the DCN gene in humans. Decorin is named for its role in "decorating" the collagen fibrils in the ECM. It is involved in various biological processes, including cell proliferation, cell migration, and tissue repair.

Structure

Decorin is a proteoglycan, meaning it consists of a core protein with one or more glycosaminoglycan (GAG) chains attached. The core protein of decorin is composed of leucine-rich repeats, which are involved in protein-protein interactions. The GAG chain attached to decorin is typically a dermatan sulfate chain.

Function

Decorin plays a crucial role in the organization of the ECM by binding to collagen fibrils, thereby regulating their formation and diameter. It also interacts with other ECM components such as fibronectin and thrombospondin. Decorin is known to modulate the activity of various growth factors, including transforming growth factor-beta (TGF-β), by sequestering them and preventing their interaction with cell surface receptors.

Biological Significance

Decorin has been implicated in various physiological and pathological processes. It is involved in wound healing, where it regulates the formation of scar tissue. Decorin also has anti-tumor properties, as it can inhibit the growth of certain cancer cells by interfering with their signaling pathways. Additionally, decorin plays a role in angiogenesis, the formation of new blood vessels, by modulating the activity of growth factors involved in this process.

Clinical Relevance

Mutations in the DCN gene can lead to disorders such as congenital stromal corneal dystrophy, a condition characterized by clouding of the cornea. Decorin is also being studied for its potential therapeutic applications in treating fibrosis, cancer, and other diseases involving abnormal ECM remodeling.

Related Pages

• Extracellular matrix
• Collagen
• Glycosaminoglycan
• Transforming growth factor-beta
• Wound healing
• Angiogenesis