Stromal cell-derived factor 1

Stromal cell-derived factor 1 (SDF-1), also known as C-X-C motif chemokine 12 (CXCL12), is a chemokine protein that in humans is encoded by the CXCL12 gene. It plays a crucial role in hematopoiesis (the formation of blood cellular components) and angiogenesis (the formation of new blood vessels from pre-existing vessels).

Function

SDF-1 is a member of the CXC chemokine family, a group of small cytokines or signaling proteins secreted by cells. Its primary function is to attract leukocytes towards sites of inflammation or injury. It does this by binding to the chemokine receptor CXCR4, a G protein-coupled receptor found on the surface of certain cells.

In addition to its role in immune response, SDF-1 is also involved in the homing of hematopoietic stem cells to the bone marrow. It is a potent chemoattractant for hematopoietic stem cells, and its interaction with CXCR4 is necessary for the migration of these cells into the bone marrow during embryogenesis.

Clinical Significance

Given its role in hematopoiesis and angiogenesis, SDF-1 has been implicated in a number of clinical conditions. It is thought to play a role in the pathogenesis of certain cancers, including breast cancer and leukemia, where it may promote tumor growth and metastasis. It has also been associated with cardiovascular diseases such as myocardial infarction and stroke, where it may contribute to the repair and regeneration of damaged tissues.

In addition, SDF-1 and its receptor CXCR4 have been identified as key players in the entry of HIV into cells. This has led to the development of drugs that target this interaction as a potential treatment for HIV infection.

See Also

• Chemokine
• CXC chemokine
• CXCR4
• Hematopoiesis
• Angiogenesis