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anxa2
ANXA2 Full Name
annexin A2
ANXA2 Introduction
Annexin A2 (ANXA2) is a calcium-dependent phospholipid-binding protein belonging to the annexin superfamily. It is widely distributed within cells, localized in the cytoplasm, nucleus, and on both the inner and outer surfaces of the plasma membrane. This diverse subcellular localization underpins its multiple biological functions. The core structure of ANXA2 enables it to bind to negatively charged membrane phospholipids, such as phosphatidylserine, in response to increased calcium concentrations. This allows it to participate in regulating membrane structure and dynamics. ANXA2 often forms a heterotetrameric complex, known as A2t, with its ligand S100A10 (p11). This complex represents the primary functional form of ANXA2 on the cell surface.
The physiological roles of ANXA2 are extensive. One of its most well-characterized functions is in the fibrinolytic system and plasma membrane repair. On the cell surface, the ANXA2-S100A10 complex acts as a co-receptor for tissue plasminogen activator (tPA) and plasminogen, significantly enhancing the generation of plasmin. Plasmin, a key protease that degrades fibrin in blood clots, makes ANXA2 essential for maintaining vascular patency and preventing excessive thrombosis. ANXA2 also plays a central role in maintaining plasma membrane integrity. Upon physical or chemical damage, a transient increase in intracellular calcium recruits ANXA2 to the injury site, where it acts as a scaffold to promote membrane remodeling and repair, preventing cell death due to the leakage of cellular contents. Beyond these functions, ANXA2 is deeply involved in various fundamental cellular processes, including signal transduction, cytoskeletal reorganization, cell migration, endocytosis, and exocytosis.
Figure 1. A summary of A2-mediated hemostasis and vascular homeostasis. (Source: Lim HI, et al. 2021)
In oncology, ANXA2 is widely recognized as a critical oncogenic driver. Its expression is significantly upregulated in multiple malignancies—such as pancreatic, liver, breast, and esophageal cancers—where high levels are strongly associated with enhanced invasiveness, increased metastatic potential, and poor patient prognosis. Proposed pro-tumor mechanisms include promoting epithelial-mesenchymal transition (EMT), enhancing cell migration, contributing to tumor angiogenesis, and modulating the tumor microenvironment. For instance, recent studies highlight ANXA2's key role in the metastasis of triple-negative breast cancer. In the context of viral infections, ANXA2 exhibits a "double-edged sword" characteristic. On one hand, it can serve as a receptor or co-receptor for various viruses—such as HPV and HCV—facilitating their entry into host cells. On the other hand, research suggests that ANXA2 may also participate in host antiviral immune responses.
Alternate Names for ANXA2
ANXA2; annexin A2; P36; ANX2; LIP2; LPC2; CAL1H; LPC2D; ANX2L4; PAP-IV; HEL-S-270; annexin-2; protein I; annexin II; lipocortin II; chromobindin 8; chromobindin-8; calpactin I heavy chain; calpactin-1 heavy chain; calpactin I heavy polypeptide; placental anticoagulant protein IV; epididymis secretory protein Li 270;
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