Ocular surface epithelial cell membrane

The ocular surface epithelial cell membrane is a complex lipid bilayer that serves as the primary physical and biological barrier between the eye and the external environment [1]. Composed of phospholipids, cholesterol, and sphingolipids, this bilayer maintains cellular integrity and regulates the transport of solutes and water, which is critical for corneal transparency and visual acuity [2]. In conditions such as Dry Eye Disease (DED) or chemical injury, the lipid bilayer is compromised by hyperosmotic stress and inflammation, leading to increased permeability and cell death [3]. While not a traditional pharmacological target like a receptor or enzyme, it is the functional target for barrier-stabilizing agents, including lipid-based artificial tears and perfluorohexyloctane, which aim to supplement the tear film lipid layer and protect the underlying cell membranes [4]. Additionally, the bilayer is a site of unintended toxicity for ophthalmic preservatives like benzalkonium chloride, which can disrupt the membrane and exacerbate ocular surface disease [5]. Therapeutic strategies often focus on reinforcing this bilayer to prevent the cycle of inflammation and desiccation seen in chronic ocular surface disorders [4]. The integrity of this membrane is often assessed clinically through staining techniques that identify areas of barrier breach [3].

Other names

Ocular surface cell lipid bilayerCorneal epithelial cell membraneConjunctival epithelial cell membraneEpithelial plasma membrane

Stabilization of the cellular barrier and reduction of evaporation through the replenishment of surface lipids and protection of the epithelial membrane integrity.