Human Trabecular Meshwork Cells

Human Trabecular Meshwork Cells (HTMCs) are primary mesenchymal-derived cells that line the collagenous beams of the trabecular meshwork, the principal tissue regulating aqueous humor outflow resistance and intraocular pressure (IOP). As non-immortalized diploid cells, they faithfully preserve native phagocytic function, contractile properties, and the extracellular matrix (ECM) remodeling machinery essential for maintaining outflow facility.

A paramount advantage of HTMCs is their unique capacity to recapitulate the pathogenic cascades of primary open-angle glaucoma (POAG) and steroid-induced glaucoma in vitro. Upon stimulation with TGF-β2, the central glaucomatous cytokine, HTMCs robustly undergo myofibroblastic differentiation, marked by α-smooth muscle actin expression, formation of cross-linked actin networks, and excessive deposition of fibronectin and collagens, thereby directly modeling the outflow resistance characteristic of POAG. Moreover, HTMCs exhibit exquisite glucocorticoid sensitivity, responding to dexamethasone with pronounced induction of the glaucoma-associated protein myocilin and ECM accumulation, faithfully replicating the steroid-induced glaucomatous phenotype. They also display senescence-associated secretory phenotype and oxidative stress responses that drive progressive dysfunction, enabling dissection of age-related IOP elevation.

HTMCs form confluent monolayers on Transwell inserts, permitting quantitative measurement of hydraulic conductivity and pharmacological evaluation of outflow-facilitating agents such as ROCK inhibitors and nitric oxide donors. Collectively, HTMCs represent the indispensable human platform for investigating aqueous humor dynamics, glaucoma pathogenesis, and preclinical screening of IOP-lowering therapeutics.