| Summary: | Hydrogen sulfide (H<sub>2</sub>S) is an essential gaseous signaling molecule. Research on its role in physiological and pathophysiological processes has greatly expanded. Endogenous enzymatic production through the transsulfuration and cysteine catabolism pathways can occur in the kidneys and blood vessels. Furthermore, non-enzymatic pathways are present throughout the body. In the renal and cardiovascular system, H<sub>2</sub>S plays an important role in maintaining the redox status at safe levels by promoting scavenging of reactive oxygen species (ROS). H<sub>2</sub>S also modifies cysteine residues on key signaling molecules such as keap1/Nrf2, NFκB, and HIF-1α, thereby promoting anti-oxidant mechanisms. Depletion of H<sub>2</sub>S is implicated in many age-related and cardiorenal diseases, all having oxidative stress as a major contributor. Current research suggests potential for H<sub>2</sub>S-based therapies, however, therapeutic interventions have been limited to studies in animal models. Beyond H<sub>2</sub>S use as direct treatment, it could improve procedures such as transplantation, stem cell therapy, and the safety and efficacy of drugs including NSAIDs and ACE inhibitors. All in all, H<sub>2</sub>S is a prime subject for further research with potential for clinical use.
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