Multiple intracellular proteins involved in apoptosis and reactive oxygen species signaling

Multiple intracellular proteins involved in apoptosis and reactive oxygen species (ROS) signaling refers to a complex network of molecular mediators that govern cell survival and death in response to oxidative stress. This group includes enzymes like superoxide dismutase, glutathione peroxidase, and caspases, as well as regulatory proteins such as the Bcl-2 family and the Nrf2 transcription factor (Redza-Dutordoir & Averill-Bates, 2016). These proteins work in concert to maintain redox homeostasis; when ROS levels exceed the cell's antioxidant capacity, these signaling pathways trigger apoptosis to eliminate damaged cells (NIH, 2023). Dysregulation of this balance is central to the pathogenesis of various conditions, including cancer, where cells evade apoptosis, and neurodegenerative disorders like amyotrophic lateral sclerosis (ALS), where oxidative stress drives neuronal loss (StatPearls, 2023). Pharmacological intervention typically involves the use of antioxidants or ROS scavengers that modulate these intracellular targets to either protect tissues from injury or sensitize resistant cells to death. For example, N-acetylcysteine acts by replenishing intracellular glutathione, thereby enhancing the cell's ability to neutralize ROS and prevent premature apoptosis (PubChem, 2024).

Other names

ROS-mediated apoptotic pathwayRedox-sensitive signaling proteinsIntracellular antioxidant networkApoptosis and ROS signaling mediators

The mechanism of action involves the modulation of intracellular redox homeostasis by either directly scavenging reactive oxygen species (ROS) or serving as a precursor for endogenous antioxidants like glutathione. This shift in the redox environment inhibits the activation of pro-apoptotic signaling pathways, such as the JNK and p38 MAPK cascades, and prevents the mitochondrial release of cytochrome c, thereby halting the caspase-mediated apoptotic program (Sadowska et al., 2007; Redza-Dutordoir & Averill-Bates, 2016).