Hydrogen ameliorates psoriasis-like skin inflammation via inhibiting the cGAS–STING pathway

Psoriasis is a chronic disease caused by abnormal immune system response, which is characterized by excessive keratinocyte proliferation and the activation of cytokine signaling pathways. In a previous study, we demonstrated in a psoriasis mouse model that hydrogen-rich water, an effective reactive oxygen species (ROS) scavenger, significantly improves disease severity. However, the precise molecular mechanism by which hydrogen helps in psoriasis treatment remains inadequately understood. This study assessed the role of hydrogen in suppressing keratinocyte hyperproliferation. We observed that the cyclic guanosine monophosphate-adenosine monophosphate synthase-stimulator of interferon gene signaling was activated in psoriasis-like skin inflammation, which was dramatically inhibited by hydrogen treatment both in vitro and in vivo. Consistently, hydrogen decreased proliferative marker expression, including BCL2, BAX, and Ki-67, and significantly reduced ROS and inflammatory cytokines production. Our study suggests that molecular hydrogen could function as a potential treatment for psoriasis.