Endometrial integrins

Endometrial integrins are a family of heterodimeric transmembrane receptors, most notably integrin alpha-v beta-3, alpha-4 beta-1, and alpha-1 beta-1, that are expressed in a cycle-dependent manner within the uterine lining (Lessey et al., 1992). They serve as critical mediators of the 'window of implantation,' facilitating the adhesion of the developing embryo to the endometrial epithelium by binding to extracellular matrix ligands such as vitronectin, fibronectin, and osteopontin (Bruce et al., 2014). In clinical practice, the absence of integrin alpha-v beta-3 during the mid-luteal phase is used as a biomarker for 'type I' uterine receptivity defects, often associated with conditions like endometriosis and unexplained infertility (Tei et al., 2003). Beyond reproduction, these integrins are frequently overexpressed in endometrial carcinomas, where they promote tumor cell survival, epithelial-mesenchymal transition (EMT), and metastasis (Nikas et al., 2003). Therapeutic targeting of these receptors involves monoclonal antibodies and RGD-mimetic small molecules designed to inhibit pathological adhesion and signaling, though their use in reproductive medicine remains largely experimental or diagnostic (Desouki et al., 2014).

Other names

Uterine integrinsIntegrin alpha-v beta-3Integrin alpha-4 beta-1Integrin alpha-1 beta-1Cell adhesion molecules of the endometrium

Competitive inhibition of ligand binding to the RGD (Arg-Gly-Asp) motif of integrin receptors