Extracellular Matrix

extracellular matrix

The extracellular matrix is the network of proteins and sugars that fills the spaces between cells in every tissue of the body. It is made from structural proteins like collagen and elastin, sticky molecules called glycoproteins, and long sugar chains called proteoglycans. Together these components form a scaffold that holds tissues together and gives them shape and strength. The matrix is not just passive scaffolding — it also binds growth factors and sends mechanical and chemical signals to nearby cells. Cells attach to the matrix through special receptors and read those signals to decide when to grow, move, or make new proteins. Because it controls both the physical environment and the messaging that cells receive, the matrix plays a key role in wound healing, development, and normal tissue maintenance. Changes in the matrix’s composition or stiffness can influence aging and contribute to diseases such as fibrosis, cancer, and degenerative conditions. Scientists study it to understand how tissues repair themselves and how to design materials for tissue engineering and regenerative medicine. Drugs and therapies that target the matrix or its interactions with cells can help reduce scarring or slow disease progression. In short, the extracellular network between cells is essential because it supports tissues physically and guides cellular behavior in health and disease.