SPARC Antibody – Rabbit Polyclonal

This gene encodes a cysteine-rich acidic matrix-associated protein. The encoded protein is required for the collagen in bone to become calcified but is also involved in extracellular matrix synthesis and promotion of changes to cell shape. The gene product has been associated with tumor suppression but has also been correlated with metastasis based on changes to cell shape which can promote tumor cell invasion. [provided by RefSeq, Dec 2011]

SPARC: Appears to regulate cell growth through interactions with the extracellular matrix and cytokines. Binds calcium and copper, several types of collagen, albumin, thrombospondin, PDGF and cell membranes. There are two calcium binding sites; an acidic domain that binds 5 to 8 Ca(2+) with a low affinity and an EF-hand loop that binds a Ca(2+) ion with a high affinity. Belongs to the SPARC family.

Protein type: Secreted; Secreted, signal peptide

Chromosomal Location of Human Ortholog: 5q31.3-q32

Cellular Component: extracellular space; platelet alpha granule membrane; nuclear matrix; cell surface; mitochondrion; cytoplasm; extracellular region; plasma membrane; basement membrane

Molecular Function: collagen binding; protein binding; extracellular matrix binding; calcium ion binding

Biological Process: response to peptide hormone stimulus; receptor-mediated endocytosis; platelet activation; response to gravity; extracellular matrix organization and biogenesis; ossification; response to cAMP; heart development; response to glucocorticoid stimulus; response to lipopolysaccharide; signal transduction; response to L-ascorbic acid; negative regulation of angiogenesis; response to cadmium ion; response to ethanol; platelet degranulation; response to cytokine stimulus; response to lead ion; negative regulation of endothelial cell proliferation; regulation of cell morphogenesis; blood coagulation; response to calcium ion; inner ear development; lung development

Disease: Osteogenesis Imperfecta, Type Xvii