Hyperglycemia Inhibits Hepatic SHBG Synthesis Through the NGBR‐AMPK‐HNF4 Pathway in Rats with Polycystic Ovary Syndrome Induced by Letrozole in Combination with a High‐Fat Diet

NgBR regulates the expression of HNF4α by activating the AMPK signaling pathway, thereby affecting the synthesis of SHBG in the liver. Further mechanistic studies regarding the effect of liver fat on NGBR expression are warranted.