Conjunctival goblet cell (CGC)

Conjunctival goblet cells are specialized, unicellular glands interspersed within the stratified epithelium of the conjunctiva that serve as the primary source of the gel-forming mucin MUC5AC in the tear film. These cells are essential for maintaining ocular surface homeostasis, providing lubrication, and trapping pathogens or debris to protect the corneal and conjunctival epithelia (Givens et al., 2023, PMID: 37454245). In many ocular surface diseases, particularly Dry Eye Disease (DED), chronic inflammation leads to a significant reduction in goblet cell density, resulting in tear film instability and subsequent ocular damage (Pflugfelder et al., 2002, PMID: 12053101). Pharmacological targeting of conjunctival goblet cells involves either stimulating the secretion of stored mucin or preserving the cell population from inflammatory degradation. Drugs like Diquafosol act as agonists for the P2Y2 receptor located on the goblet cell membrane, triggering an increase in intracellular calcium and subsequent mucus release (Lau et al., 2014, PMID: 24803487). Anti-inflammatory agents like Cyclosporine help restore the goblet cell population by inhibiting T-cell infiltration and cytokine production (e.g., IFN-gamma) that otherwise drive goblet cell loss. While technically a cell type rather than a single molecular target, they represent a critical functional unit in ophthalmic drug development and therapy.

Other names

Ocular goblet cellMucus-secreting conjunctival cellConjunctival secretory cell

Stimulation of P2Y2 purinergic receptors to trigger mucin exocytosis; induction of mucin gene expression (MUC5AC); suppression of T-cell mediated inflammation to prevent goblet cell apoptosis; and promotion of cellular proliferation and differentiation.