Gremlin (protein)

Gremlin is a protein that in humans is encoded by the GREM1 gene. It is a member of the Bone Morphogenetic Protein (BMP) antagonist family. Like all proteins in this class, gremlin prevents the binding of BMPs to their corresponding receptors, thereby inhibiting BMP-induced cell differentiation and growth.

Function

Gremlin is a high-affinity antagonist of bone morphogenetic proteins (BMP) 2, 4, and 7. It functions by binding to BMPs, preventing them from interacting with their receptors and thus inhibiting BMP-mediated signal transduction. This is critical in many biological processes, including embryogenesis, organogenesis, and tissue homeostasis.

Clinical significance

Alterations in the normal function of gremlin have been implicated in several diseases. For example, overexpression of gremlin has been observed in certain types of cancer, including lung cancer and pancreatic cancer. In these cases, gremlin may promote tumor growth and progression by inhibiting BMP-mediated differentiation of cancer cells.

In contrast, reduced gremlin expression has been associated with fibrosis in various organs. In these cases, loss of gremlin allows for unchecked BMP signaling, which can lead to excessive tissue scarring and organ dysfunction.

See also

• Bone Morphogenetic Protein
• Signal transduction
• Cancer
• Fibrosis