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Shi M, Yin L, Sun Y, Wang C, Cai L, Zhang T, Zhou X, Fawcett JP, Gao X, Gu J. Pharmacokinetic Study of Conjugated Equine Estrogens in Healthy Chinese Postmenopausal Women Using a Parallel Two-Column LC-MS/MS Method. Clin Pharmacokinet 2022; 61:1571-1583. [PMID: 36173592 DOI: 10.1007/s40262-022-01177-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/31/2022] [Indexed: 01/31/2023]
Abstract
BACKGROUND AND OBJECTIVE: Postmenopausal women often require estrogen supplementation to improve menopausal and postmenopausal vasomotor symptoms and maintain hormonal balance. Conjugated equine estrogens extracted from the urine of pregnant mares are commonly used to provide this estrogen replacement therapy. The complex composition of this mixture of animal sulfated metabolites makes its bioanalysis challenging such that its detailed pharmacokinetics has not been fully characterized. The purpose of this work is to reveal the pharmacokinetic behavior of conjugated equine estrogens in healthy Chinese postmenopausal women by a parallel two-column LC-MS/MS method. METHODS An open-label study was carried out in 35 Chinese healthy postmenopausal women who received a single dose of Premarin® 0.625 mg. A high-throughput column-switching liquid chromatography-tandem mass spectrometry method was developed to determine four conjugated estrogens and two unconjugated estrogens formed by hydrolysis in vivo. The method multiplexes two high-performance liquid chromatography systems into one mass spectrometer and incorporates the positive/negative ion switching acquisition mode of mass spectrometry to significantly increase analysis efficiency. Pharmacokinetics was determined using non-compartmental methods. RESULTS Both conjugated and unconjugated estrogens can be analyzed simultaneously in a single run with an analysis time of 13.0 minutes in the column-switching liquid chromatography-tandem mass spectrometry method as opposed to 23.0 minutes in a single-column liquid chromatography-tandem mass spectrometry system. The exposures (maximum concentration and area under the curve) of estrone and equilin in Chinese women were higher than those in the North American women. CONCLUSIONS The fully validated assay was successfully applied to a pharmacokinetic study in healthy postmenopausal Chinese women after oral administration of a conjugated equine estrogen tablet. This study suggests that Chinese postmenopausal women achieve the same level of unconjugated estrogens in plasma at a lower dose of conjugated equine estrogens than North American women.
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Affiliation(s)
- Meiyun Shi
- Research Center for Drug Metabolism, School of Life Science, Jilin University, 2699 Qianjin Street, Changchun, 130012, People's Republic of China.,School of Life and Pharmaceutical Sciences, Dalian University of Technology, Panjin, People's Republic of China
| | - Lei Yin
- Research Center for Drug Metabolism, School of Life Science, Jilin University, 2699 Qianjin Street, Changchun, 130012, People's Republic of China.,School of Life and Pharmaceutical Sciences, Dalian University of Technology, Panjin, People's Republic of China
| | - Yantong Sun
- School of Pharmaceutical Sciences, Jilin University, Changchun, People's Republic of China
| | - Can Wang
- Research Center for Drug Metabolism, School of Life Science, Jilin University, 2699 Qianjin Street, Changchun, 130012, People's Republic of China
| | - Lanlan Cai
- Research Center for Drug Metabolism, School of Life Science, Jilin University, 2699 Qianjin Street, Changchun, 130012, People's Republic of China
| | - Tinglan Zhang
- Research Center for Drug Metabolism, School of Life Science, Jilin University, 2699 Qianjin Street, Changchun, 130012, People's Republic of China
| | - Xiaotong Zhou
- Research Center for Drug Metabolism, School of Life Science, Jilin University, 2699 Qianjin Street, Changchun, 130012, People's Republic of China
| | - J Paul Fawcett
- Research Center for Drug Metabolism, School of Life Science, Jilin University, 2699 Qianjin Street, Changchun, 130012, People's Republic of China
| | - Xiaoli Gao
- College of Pharmacy, Xinjiang Medical University, Urumqi, 830011, People's Republic of China. .,Xinjiang Key Laboratory of Active Components and Drug Release Technology of Natural Drugs, Urumqi, People's Republic of China. .,Engineering Research Center of Xinjiang and Central Asian Medicine Resources, Ministry of Education, Beijing, People's Republic of China.
| | - Jingkai Gu
- Research Center for Drug Metabolism, School of Life Science, Jilin University, 2699 Qianjin Street, Changchun, 130012, People's Republic of China.
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Wang H, Zheng Z, Zhang N, Zhou Y, Jin S. Regular transient limb ischemia protects endothelial function against hypercholesterolemic damage in rabbits. Sci Prog 2021; 104:368504211036858. [PMID: 34351826 PMCID: PMC10358469 DOI: 10.1177/00368504211036858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Regular transient limb ischemia (RTLI) can prevent atherosclerosis in hypercholesterolemic rabbits. As endothelial dysfunction is the initial factor leading to atherosclerosis, we investigated the effect of RTLI on endothelial function in hypercholesterolemic rabbits. We randomly allocated 15 New Zealand white rabbits to three groups, five animals per group: the hypercholesterolemic group (Group H), the sham RTLI group (Group S), and the RTLI group (Group L). All rabbits received hypercholesterolemic fodder daily. No intervention was performed on the rabbits in Group H. Rabbits in Group S were kept in hutches, with a deflated cuff applied to their left hind limb for 60 min every day. For rabbits in Group L, RTLI (six cycles of 5-min ischemia and 5-min reperfusion of the left hind limb) was applied once daily for 12 weeks. At the end of week 12, a segment of the abdominal aorta was isolated from each rabbit for in vitro measurement of the endothelium-dependent vasodilation (EDV) response to different concentrations of acetylcholine and the endothelium-independent vasodilation (EIV) response to sodium nitroprusside. The EDV response was significantly higher in Group L than in Groups S and H (p < 0.05), with no significant difference between Groups S and H (p > 0.05). There was no difference in the EIV response among the three groups. RTLI could improve the EDV response, protecting endothelial function against hypercholesterolemic damage.
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Affiliation(s)
- Hongli Wang
- Department of Anesthesia, The Fifth Central Hospital of Tianjin, Tianjin, China
| | - Zhinan Zheng
- Department of Anesthesia, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Nanrong Zhang
- Department of Anesthesia, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Yan Zhou
- Department of Anesthesia, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Sanqing Jin
- Department of Anesthesia, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
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