How does decorin work?

Decorin has been shown to either enhance or inhibit the activity of TGF-beta 1. The primary function of decorin involves regulation during the cell cycle. Other angiogenic growth factors that decorin inhibits are angiopoietin, hepatocyte growth factor (HGF) and platelet-derived growth factor (PDGF).

What do proteoglycans do?

Function. Proteoglycans are a major component of the animal extracellular matrix, the “filler” substance existing between cells in an organism. They are also involved in binding cations (such as sodium, potassium and calcium) and water, and also regulating the movement of molecules through the matrix.

Is Aggrecan a gag?

Almost 90% of aggrecan mass is comprised of substituted GAG chains which are mostly chondroitin sulfate chains, but also include keratan sulfate chains with N- and O-linked oligosaccharides.

Why is elastin important?

Elastin is a key protein of the extracellular matrix. It is highly elastic and present in connective tissue allowing many tissues in the body to resume their shape after stretching or contracting. Elastin helps skin to return to its original position when it is poked or pinched.

What do proteoglycans do in cartilage?

Proteoglycans as one of the main components of the ECM have diverse functions in the cartilage. They bind water and provide the basis for absorbing high compressive loads.

What is the ACAN gene?

The ACAN gene provides instructions for making the aggrecan protein. Aggrecan is a type of protein known as a proteoglycan, which means it has several sugar molecules attached to it. It is the most abundant proteoglycan in cartilage, a tough, flexible tissue that makes up much of the skeleton during early development.

What cell makes aggrecan?

chondrocytes
Aggrecan is a multimodular molecule expressed by chondrocytes. Its core protein is composed of three globular domains (G1, G2, and G3) and a large extended region (CS) between G2 and G3 for glycosaminoglycan chain attachment. G1 comprises the amino terminus of the core protein.

Where is elastin located?

connective tissues
Elastin is another key structural protein found in the ECMs of connective tissues (e.g., blood vessels, esophagus, skin) that need to stretch and retract following mechanical loading and release [186,187]. It is found predominantly in the walls of arteries, lungs, intestines, and skin, as well as other elastic tissues.

How is elastin produced?

Elastin is formed by polymerization of tropoelastin monomers. It is an amorphous protein highly resistant to the action of proteases that forms the core of elastic fibers. Microfibrils surrounding the core are composed of fibrillins that bind a number of proteins involved in fiber formation.

What is a proteoglycan composed of?

Proteoglycans are macromolecules consisting of a protein core to which are attached 50 to 100 unbranched glycosaminoglycans (chondroitin sulfate and O-linked keratan sulfate). At least five different protein cores have been defined. The principal proteoglycan of hyaline cartilage is called aggrecan.

What is the meaning of proteoglycan?

Definition of proteoglycan : any of a class of glycoproteins of high molecular weight that are found especially in the extracellular matrix of connective tissue.