PPARGC1A and hyperthyroidism: In order to simulate the condition of hyperthyroidism, granulosa cells (GCs) extracted from rats were treated by T3 with high concentrations, which decreased the expression of PGC-1α, resulting in decreased expressions of GRP78 and other ferroptosis-related markers such as glutathione peroxidase 4 (GPX4) and solute carrier family 7 member 11 (SLC7A11, xCT), thereby inducing ferroptosis in GCs.