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Short-term effects of epigallocatechin gallate (EGCG) on (A) H2S (AzMC fluorescence) and (B) polysulfides (SSP4 fluorescence) in HEK293 cells. EGCG had little effect on H2S, whereas it rapidly and concentration-dependently increased polysulfide production. SSP4 was added at t = 0 h; EGCG was added 5–10 min later. Bar graphs show effects at 1, 2 and 5 h after SSP4 addition; #, p < 0.00.1; *, p < 0.001.
