glutathione redox biology Disulfide - an overview Frontiers | Glutathione: new roles

Zhu Y, Tong L, Nie K, Wiwatanaratanabutr I, Sun P, Li Q, et al

Effects of Haem Oxygenase-1 Expression on Oxidative Injury and Biological Behaviours of Rat Dermal Fibroblasts

By integrating metagenomic profiles, we further revealed that gut microbial dysbiosis in RBD-PD and iRBD drives a functional shift away from dietary fiber fermentation and toward enhanced degradation of protein, aromatic amino acids, glycine, and intestinal mucin glycans

doi: 10.1111/j.1468-3083.2009.03295.x

Another significant endogenous mechanism is the activity of various oxidase enzymes

(65) using stable isotope labeling of glutamine and glucose followed by metabolomics, reported that M1 macrophages preferentially utilize glutamine, and the chemical or genetic ablation of glutamine synthase perturbs M1 polarization of the macrophages