It has been reported that matrine can reverse the changes of Th17/Treg cytokines induced by Aβ42 injection in AD rats, downregulate the expression of retinoid-related orphan receptor γt (RORγt), upregulate the expression of fork head box p3 (Foxp3), a specific transcription factor of Th17 cells, improve the learning and memory abilities of AD rats, and alleviate the cognitive impairment of AD rats (Zhang Y. et al., 2015). The gene discussed is FOXP3; the disease is Alzheimer disease.