HSPA4 (heat shock protein family A (Hsp70) member 4) is a chaperone protein with an activity similar to that of Hsp110, and thus, is considered to be a member of the hsp110 protein family. It is a cytoplasmic protein and is composed of a nucleotide-binding domain (NBD) and a peptide-binding domain (PBD) intervened by a flexible linker region. In adult mouse tissues, HSPA4 mRNA has a wide range of expression with the highest expression in spleen, ovary and testis.
Synonyms: Anti-HSP70RY; Anti-Heat shock 70 kDa protein 4; Anti-Heat shock 70-related protein APG-2
Storage: -20C
Application: Anti-HSPA4 antibody produced in rabbit, a Prestige Antibody, is developed and validated by the Human Protein Atlas (HPA) project (www.proteinatlas.org). Each antibody is tested by immunohistochemistry against hundreds of normal and disease tissues. These images can be viewed on the Human Protein Atlas (HPA) site by clicking on the Image Gallery link. The antibodies are also tested using immunofluorescence and western blotting. To view these protocols and other useful information about Prestige Antibodies and the HPA, visit sigma.com/prestige.
Biochem Physiol Actions: HSPA4 (heat shock protein family A (Hsp70) member 4) is up-regulated in breast, ovarian, pancreatic and colon cancers. It plays an essential role in the migration, invasiveness and transformation of cancer cells. It is a candidate cancer stem cells (CSCs) marker for gastric cancer. This protein is induced in response to radioactive and acidic pH stress, and is up-regulated in HCC (hepatocellular carcinoma). This protein is up-regulated by NBS1 protein, which is elevated in the chromosomal-instability syndrome called Nijmegen breakage syndrome (NBS). This protein plays a critical role in normal spermatogenesis. The over-expression of HSPA4 is related with poor prognosis in HBV (hepatitis B virus)-associated early-stage HCC.
Legal Information: Prestige Antibodies is a registered trademark of Sigma-Aldrich Co. LLC