Anti-Inflammatory Activities of Some Plants of Genus Alpinia: Insights from In Vitro, In Vivo, and Human Studies.

This narrative review intends to provide thorough information on the anti-inflammatory activities of Alpinia plants, the largest genus of the family Zingiberaceae. The articles were searched on the PubMed database using 'Alpinia AND anti-inflammatory activity' as the keywords, filtered to articles published from 2020 to 2024 and free full-text. Of the approximately 248 members of the genus Alpinia plants, the most commonly studied for their anti-inflammatory activities are A. galanga, A. officinarum, A. zerumbet, and A. oxyphylla. Only A. galanga, A. officinarum, and A. zerumbet have been studied in humans. Studies in animal models revealed that the plants contributed as exogenous antioxidants, reduced proinflammatory cytokines, inhibited proinflammatory enzymes, improved gastric acid and gastrointestinal motility, and promoted ulcer healing. The terpenoids, flavonoids (such as kaempferol, quercetin, and galangin), and diarylheptanoids obtained from the rhizomes of these plants may crucially play important roles in their anti-inflammatory activities. These plants did not show toxicity toward numerous normal cell lines (RAW 264.7, IEC-6, HepG2, MT-4, NIH-3T3, Vero cells, human peripheral blood mononuclear cells, and HaCaT) but were toxic to cancer cell lines (HT29). In humans, A. galanga was studied for its effects as psychostimulants improving mental health, improving sperm motility, and erectile dysfunction. Similarly, A. officinarum could improve sperm morphology and idiopathic infertility, whereas A. zerumbet worked as a cardio-myorelaxant in patients with cardiovascular diseases.