This review discusses antioxidant responses and cellular adjustments to oxidative stress, focusing on key cellular nucleophiles like glutathione (GSH) and their interactions with oxidants. It highlights the Nrf2-Keap1 pathway as a major transcriptional antioxidant response and summarizes redox activation pathways. The review emphasizes the importance of redox-sensitive post-translational modifications, such as S-glutathionylation, and the role of redox-sensitive microRNAs in post-transcriptional regulation. It also discusses antioxidant responses in pathophysiological contexts like endoplasmic reticulum (ER) stress and ischemia-reperfusion (IR). ER stress is linked to redox-mediated post-translational modifications of thiols, while IR involves oxidative damage and the role of Nrf2 in mitigating it. The review also covers the role of redox signaling in cellular processes, including the regulation of transcription factors like Nrf2, NF-κB, and AP-1, as well as the involvement of microRNAs in antioxidant responses. The study highlights the importance of understanding these mechanisms for developing antioxidant-based therapeutic interventions in redox-related diseases.This review discusses antioxidant responses and cellular adjustments to oxidative stress, focusing on key cellular nucleophiles like glutathione (GSH) and their interactions with oxidants. It highlights the Nrf2-Keap1 pathway as a major transcriptional antioxidant response and summarizes redox activation pathways. The review emphasizes the importance of redox-sensitive post-translational modifications, such as S-glutathionylation, and the role of redox-sensitive microRNAs in post-transcriptional regulation. It also discusses antioxidant responses in pathophysiological contexts like endoplasmic reticulum (ER) stress and ischemia-reperfusion (IR). ER stress is linked to redox-mediated post-translational modifications of thiols, while IR involves oxidative damage and the role of Nrf2 in mitigating it. The review also covers the role of redox signaling in cellular processes, including the regulation of transcription factors like Nrf2, NF-κB, and AP-1, as well as the involvement of microRNAs in antioxidant responses. The study highlights the importance of understanding these mechanisms for developing antioxidant-based therapeutic interventions in redox-related diseases.