The Water Extract of Sweet Tea Alleviates LPS-Induced Acute Lung Injury Through Anti-Inflammatory and Antioxidant...

Background/Objectives:Lithocarpus litseifolius (Hance) Chun, also known as sweet tea, is a traditional Chinese tea-making plant. Acute lung injury (ALI), a life-threatening syndrome with symptoms like hypoxemia and dyspnea, can be triggered by infection or trauma, with high morbidity and mortality. Whether the water extract of Lithocarpus litseifolius (WEL) has therapeutic effects on ALI remains unclear. This study aimed to analyze WEL's components, establish in vitro cellular inflammation and mouse ALI models, and investigate WEL's protective effects against LPS-induced ALI. Methods: LC-MS analysis identified 42 compounds in WEL and quantified three key ones. In an LPS-induced mouse ALI model, WEL significantly reduced lung injury severity, lung wet-to-dry ratio, pulmonary edema, and levels of NO, ROS, IL-1β, TNF-α, and MPO in lung tissues and bronchial alveolar lavage fluid. Immunohistochemical analysis showed WEL pretreatment inhibited the upregulation of NLRP3, Caspase-1, and GSDMD-NT expression, mitigated tissue oxidative stress and cell pyroptosis, and alleviated ALI severity in mice. Cellular experiments confirmed WEL's protective effects via anti-inflammatory, antioxidant actions, and inhibiting cell pyroptosis, with phlorizin and trilobatin as potential key active ingredients. Conclusions: This research demonstrates sweet tea's significant protective effects against ALI and its potential to alleviate inflammation by inhibiting pyroptosis, providing a theoretical basis for developing new health-promoting functions of sweet tea.