Jiatong Li, Ao Gu, Ziheng Jia, Mengyao Li, Jinlu Zuo, Ziyi Wang, Xuechuan Li, Jiayi Feng, Tong Xue, Shuyang Zhai, Zhuying Yue, Yang An, Siyuan Kang, Zhiqing Yuan, Shimei Qiu, Yadong Xue, Liguo Liu, Nannan Tang, Yingbin Liu
Approximately 90% of patients with pancreatic cancer harbor KRAS mutations, predominantly the KRASG12D subtype. HRS-4642, a non-covalent inhibitor targeting KRASG12D, demonstrates potent antitumor efficacy but may ultimately lead to resistance. This study investigates the mechanisms underlying KRASG12D inhibitor resistance and evaluates strategies to enhance treatment sensitivity. Our findings indicate that a glutamine-restricted diet not only reverses KRASG12D inhibitor resistance in pancreatic ductal adenocarcinoma (PDAC) but also achieves remission with prolonging survival. Mechanistically, KRASG12D inhibitor resistance markedly upregulates ANXA1 expression, which, in turn, promotes its binding to the glutamine-related enzyme GOT1 and stabilizes its expression. Additionally, we find that ANXA1 upregulation facilitates mitochondrial localization of GLS1, thereby altering glutamine metabolism. These findings highlight ANXA1-mediated glutamine metabolism as a key driver of KRASG12D inhibitor resistance and support glutamine-restricted diets as a potential therapeutic strategy for KRASG12D mutant PDAC.