Pharmacokinetics, Bioavailability, and Tissue Distribution of the Kirsten Rat Sarcoma Inhibitor Adagrasib in Rats Using UPLC-MS/MS

Pan Lei,1,2 Wanying Shen,2 Huijuan Tang,2 Li You,2 Guoyi Chen,2 Yijun Tang,1 Wei Lu3 1Hubei Key Laboratory of Embryonic Stem Cell Research, Taihe Hospital, Hubei University of Medicine, Shiyan, People’s Republic of China; 2Hubei Hongshan Laboratory, College of Biomedicine and Health, College of Life Science and Technology, Huazhong Agricultural University, Wuhan, People’s Republic of China; 3Department of Pharmacy, Taihe Hospital, Hubei University of Medicine, Shiyan, People’s Republic of ChinaCorrespondence: Yijun Tang, Hubei Key Laboratory of Embryonic Stem Cell Research, Taihe Hospital, Hubei University of Medicine, Shiyan, People’s Republic of China, Email tyj_799@taihehospital.com Wei Lu, Department of Pharmacy, Taihe Hospital, Hubei University of Medicine, Shiyan, People’s Republic of China, Email luwei0903@taihehospital.comPurpose: Adagrasib is a selective and reversible inhibitor of KRAS G12C, which significantly delays the progression of solid tumors. However, the absorption, distribution, metabolism, and excretion of adagrasib in vivo are unclear. This study explores the absorption and distribution of adagrasib in vivo.Methods: An ultra-high performance liquid chromatography-tandem quadrupole mass spectrometry (UPLC-MS/MS) method was established for the determination of adagrasib in the rat plasma and tissue. Sprague-Dawley rats were intravenous administrated (5 mg/kg) and oral administrated (30 mg/kg) with adagrasib, and the plasma concentration of adagrasib was determined. After single oral administration of adagrasib (30 mg/kg), the heart, liver, spleen, lung, kidney, intestine, and pancreas were excised. The organs were homogenized with saline solution, and the concentration of adagrasib in tissues was determined.Results: The intra- and inter-day accuracy were from 84.90% to 113.47%, and the precision was within ± 15%. The matrix effect and recovery were within ± 15%. The maximum plasma concentration (Cmax) of adagrasib was 677.45 ± 58.72 ng/mL. The elimination half-life time (t1/2) was 3.50 ± 0.21 h after oral administration and 2.08 ± 0.54 h after intravenous administration. The oral bioavailability was 50.72%. The highest concentrations of adagrasib in liver was 5047.80 ± 676.48 ng/g at 2 h after administration, and it was still detectable at 24 hours after administration.Conclusion: Adagrasib was slowly absorbed and cleared rapidly, and it was also widely distributed in vivo. This study provides a potential reference for adagrasib in clinical studies.Keywords: adagrasib, UPLC-MS/MS, pharmacokinetics, tissue distribution