Solute carrier family 2, facilitated glucose transporter member 1 (GLUT-1) and ocular surface matrix components

Corneal epithelial GLUT-1 (Solute carrier family 2, facilitated glucose transporter member 1) and ocular surface matrix components, primarily fibronectin and collagen, represent the dual molecular targets for the therapeutic action of carboxymethylcellulose (CMC) in ophthalmic care (Garrett et al., 2007). GLUT-1 is the predominant glucose transporter in the corneal epithelium, and CMC, a polysaccharide composed of glucopyranose subunits, binds to this transporter by mimicking the structure of glucose (Kumagai et al., 1994). This interaction, along with CMC's ability to bind directly to extracellular matrix proteins exposed during corneal damage, facilitates the adhesion and migration of corneal epithelial cells. These processes are critical for the repair of the ocular surface in conditions such as dry eye disease and corneal abrasions. By targeting these components, CMC-based formulations provide both physical lubrication and biological support for re-epithelialization, making them particularly effective in managing diabetic keratopathy where glucose metabolism and matrix integrity are compromised (McDermott et al., 1998).

Other names

Corneal epithelial GLUT-1 and ocular surface matrix componentsCMC binding sitesGLUT-1 and extracellular matrix proteinsSolute carrier family 2 member 1 and fibronectin/collagen complex

Carboxymethylcellulose (CMC) acts as a glucose mimic, binding to the corneal epithelial glucose transporter GLUT-1 to enhance its retention on the ocular surface. Simultaneously, it binds to extracellular matrix components such as fibronectin and collagen, which are exposed during corneal injury, to facilitate epithelial cell adhesion and migration, thereby promoting wound healing.