Incubation of whole bovine lens with 10(-7) M 12-O-tetradecanoylphorbol-13-acetate (TPA) led to the lens opacity within 24 h. The hydrogen peroxide (H2O2) concentration in the whole lens was elevated 4 fold after treatment with either 10(-7) M TPA or 2.5 mM glucose/20 microM glucose oxidase. The lens opacification and H2O2 elevation were TPA dose-dependent. Preincubation of the lens with anti-tumor promoting agents EGCG (epigallocatechin gallate) or Sarp A (sarcophytol A) stopped the TPA-mediated opacification process and suppressed H2O2 elevation.
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