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Glutathione (GSH) deficiency and interleukin-1β (IL-1β) upregulation are linked to the progression of vascular inflammation and atherosclerosis. The consumption of sulfide-rich vegetables is known to lower the risk of atherosclerosis. This study examined the hypothesis that hydrogen sulfide (H2S) upregulates the glutamate-cysteine ligase catalytic subunit (GCLC) and GSH and inhibits IL-1β in a monocyte cell model. U937 monocytes were supplemented with H2S (0-12.5 μM) for 2 hr and then exposed to a control or high glucose (HG, 25 mM) for 22 hr. Levels of GCLC and glutamate-cysteine ligase modifier subunit (GCLM) expression were determined by western blotting and GSH using high-performance liquid chromatography (HPLC), and IL-1β using enzyme-linked immunoassay (ELISA). H2S significantly (P&lt;0.05) upregulated expression of GCLC and GCLM, and formation of GSH, and inhibited IL-1β secretion in controls and HG-treated monocytes. This is the first demonstration of H2S upregulation of GCLC and GSH and inhibition of IL-1β levels, which may be what mediates the beneficial effects of H2S-rich compounds in mitigating the pathogenesis of metabolic syndrome and atherosclerosis.

metabolic syndrome and related disorders

Hydrogen Sulfide Upregulates Glutamate–Cysteine Ligase Catalytic Subunit, Glutamate–Cysteine Ligase Modifier Subunit, and Glutathione and Inhibits Interleukin-1β Secretion in Monocytes Exposed to High Glucose Levels