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Metabolomic analyses reveal EGCG undergoes glucuronidation and sulfation, reducing its concentration in circulation

GSH production is supported by NRF2 through controlling several enzymes responsible for GSH synthesis, such as the glutamate-cysteine ligase (GCL) complex composed of two subunits, the modifier (GCLM) subunit and the catalytic (GCLC) subunit, which catalyze the rate-limiting step of GSH synthesis that converts cysteine and glutamate into GSH [22]

4.1 Overview of autophagy Autophagy is a conserved intracellular degradation process that maintains cellular homeostasis by degrading and recycling damaged organelles and misfolded or excess proteins via autophagosomes (Yang and Klionsky, 2020)

Under normal physiological conditions, reduced GSH is present in concentrations 10 to 100 times greater than oxidized GSH (GSSG), making the GSH/GSSG ratio a common measure of cellular oxidative stress ( The function of GPX4 is precisely regulated by nuclear factor E2-related factor 2 (NRF2), a key transcription factor that activates the expression of various antioxidant genes, including those encoding GSH synthetase and superoxide dismutase (SOD), facilitating the clearance of excess ROS (Xie et al., 2016