Pharmacokinetics and pharmacodynamics studies of Relugolix long-acting microcrystalline formulation in male Beagle dogs

IF 4.7 3区 医学 Q1 PHARMACOLOGY & PHARMACY
Chunxian Li , Jingxian Wang , Jianxin Wang , Miao Yu , Pei Zhao , Jing Yu , Xiaohong Guo , Zhanling Luo , Xiaolai Yang
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Abstract

Relugolix is the first oral GnRH receptor antagonist. However, its oral formulation requires daily administration, leading to poor patient adherence and suboptimal treatment outcomes for long-term users. To address these issues, we developed a long-acting microcrystalline formulation of relugolix administered once every 28 days.This study systematically evaluated the pharmacokinetics (PK), pharmacodynamics (PD), and safety profile of the drug following intramuscular administration in male Beagle dogs. In this study, we established a HPLC-MS/MS method for blood concentration detection, used a highly specific and stable ELISA method to measure serum testosterone levels, and assessed the safety of the drug in male Beagle dogs. The HPLC-MS/MS method showed good linearity (R²=0.9991). The intra-day precision varied between 2.8 % and 10.9 %, while the inter-day precision ranged from 1.6 % to 5.4 %. In terms of accuracy, the intra-day values ranged from -7.3 % to -3.2 %, and the inter-day accuracy ranged from -10.2 % to 0.8 %. Furthermore, key parameters such as stability, extraction recovery, and matrix effects met the FDA bioanalytical method validation guidelines. PK studies showed that the AUC and Tmax exhibited significant sustained-release characteristics, and the half-life was notably extended compared to Orgovyx. PD analysis showed a significant negative correlation between blood drug concentration and testosterone suppression (testosterone levels began to decline after administration, and castration levels were maintained between 504–1008 h). Safety assessments revealed that although no treatment-related deaths or significant weight changes were observed, some hematological parameters (RBC, HGB increases), liver function indicators (ALT, AST increases), and triglyceride (TG) levels showed statistically significant changes (p < 0.05). This suggests potential concerns regarding hemodynamic effects, hepatotoxicity, and lipid metabolism abnormalities. This study is the first to systematically evaluate the PK/PD characteristics of the long-acting micronized formulation of relugolix, providing key data for its clinical translation, but further validation through large sample and cross-species studies is needed.

Abstract Image

长效微晶制剂在雄性比格犬体内的药代动力学和药效学研究
Relugolix是首款口服GnRH受体拮抗剂。然而,其口服制剂需要每天给药,导致患者依从性差,长期使用者的治疗结果不理想。为了解决这些问题,我们开发了一种长效微晶制剂,每28天给药一次。本研究系统评估了雄性Beagle犬肌肉给药后的药代动力学(PK)、药效学(PD)和安全性。本研究建立了HPLC-MS/MS血药浓度检测方法,采用特异性高、稳定性好的ELISA法测定血清睾酮水平,并对该药物在雄性Beagle犬体内的安全性进行了评估。HPLC-MS/MS方法线性良好(R²=0.9991)。日间精度在2.8% ~ 10.9%之间,日间精度在1.6% ~ 5.4%之间。在准确度方面,日内值范围为- 7.3%至- 3.2%,日间准确度范围为- 10.2%至0.8%。此外,稳定性、萃取回收率和基质效应等关键参数符合FDA生物分析方法验证指南。PK研究表明,与Orgovyx相比,AUC和Tmax具有显著的缓释特性,半衰期明显延长。PD分析显示血药浓度与睾酮抑制呈显著负相关(给药后睾酮水平开始下降,去势水平维持在504-1008 h)。安全性评估显示,虽然没有观察到与治疗相关的死亡或明显的体重变化,但一些血液学参数(RBC、HGB升高)、肝功能指标(ALT、AST升高)和甘油三酯(TG)水平显示有统计学意义的变化(p < 0.05)。这提示潜在的血流动力学影响、肝毒性和脂质代谢异常。本研究首次系统评价了长效微粉制剂relugolix的PK/PD特性,为其临床转化提供了关键数据,但需要通过大样本和跨物种研究进一步验证。
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来源期刊
CiteScore
9.60
自引率
2.20%
发文量
248
审稿时长
50 days
期刊介绍: The journal publishes research articles, review articles and scientific commentaries on all aspects of the pharmaceutical sciences with emphasis on conceptual novelty and scientific quality. The Editors welcome articles in this multidisciplinary field, with a focus on topics relevant for drug discovery and development. More specifically, the Journal publishes reports on medicinal chemistry, pharmacology, drug absorption and metabolism, pharmacokinetics and pharmacodynamics, pharmaceutical and biomedical analysis, drug delivery (including gene delivery), drug targeting, pharmaceutical technology, pharmaceutical biotechnology and clinical drug evaluation. The journal will typically not give priority to manuscripts focusing primarily on organic synthesis, natural products, adaptation of analytical approaches, or discussions pertaining to drug policy making. Scientific commentaries and review articles are generally by invitation only or by consent of the Editors. Proceedings of scientific meetings may be published as special issues or supplements to the Journal.
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