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Annexin A4 (ANXA4)

Target: ANXA4
Molecular classification: Calcium-dependent phospholipid-binding protein (Annexin family), Other (membrane-associated protein)

Overview

Annexin A4 is a member of the annexin family of calcium-dependent phospholipid-binding proteins, predominantly expressed in epithelial cells. It binds reversibly to phospholipid membranes in a calcium-dependent manner, plays a role in exocytosis, promotes membrane fusion and repair, and inhibits phospholipase A2 activity. It is implicated in membrane dynamics, including repair of plasma membrane injury via curvature and trimerization, and has emerging roles in cancer biology such as regulation of proliferation, metastasis, cell adhesion, and chemotherapy resistance. High expression or altered localization of Annexin A4 is associated with several epithelial cancers and may contribute to disease progression and drug resistance, making it a relevant therapeutic target and biomarker in oncology research

Other names: Annexin A4ANXA4ANX4Annexin IVPlacental anticoagulant protein II (PAP-II)35-beta calcimedinProtein IIHEL-S-274P32.5PP4-XZAP36Chromobindin-4Endonexin ILipocortin IVCarbohydrate-binding protein p33/p41Epididymis secretory protein Li 274Proliferation-inducing gene 28Proliferation-inducing protein 28

Mechanism of action

Drugs may modulate membrane repair, calcium-dependent localization, and self-association of ANXA4 to affect cancer cell survival and drug resistance. Regulation of ANXA4 may influence membrane stability, cell adhesion, and apoptotic processes in epithelial cells

Biological functions

Membrane repair and fusionExocytosis (membrane trafficking, secretory pathways)Inhibition of phospholipase A2 activityRegulation of epithelial chloride secretionRegulation of cell proliferation, apoptosis, adhesion, invasion, metastasis, and chemotherapy resistance (particularly in cancer)

Disease associations

Cancer (highly implicated in colorectal, ovarian, and lung cancers)InflammationOther (Chronic gonococcal salpingitis)

Safety considerations

Notable challenges include drug resistance mediated by high ANXA4 expression in cancerPossible effects on normal membrane repair and secretory function when inhibited or modulated

Interacting drugs

Paclitaxel (ANXA4 is involved in drug resistance; direct interaction not confirmed, but its cellular localization is affected by the drug)

Biomarkers

High ANXA4 expression is reported as a biomarker for tumor progression, metastasis, and poor chemotherapy response in colorectal and ovarian cancers

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