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Purpose: To investigate the effects of nitroglycerin on the production of nitric oxide and its related pathway in cultured human trabecular meshwork cells (HTMC). Methods: Primarily cultured HTMC were exposed to 10 nM nitroglycerin using 1% serum-containing media for 30 minutes.The production of nitric oxide was assessed with the Griess assay and expressions of eNOS mRNA was assessed with RT-PCR. Additionally, the cells were exposed to wortmanin and Akt1/2 kinase inhibitor to investigate the mechanism related to the production of nitric oxide. Results: Nitroglycerin increased the production of nitric oxide (p < 0.05) accompanied with increased expression of eNOS mRNA. The increased production of nitric oxide and eNOS mRNA was inhibited by wortmanin and Akt1/2 kinase inhibitor. Conclusions: Low-dose nitroglycerin increased the production of nitric oxide accompanied by increased eNOS activity.Nitroglycerin drives eNOS activation via the phosphatidylinositol 3-kinase/protein kinase B pathway.

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