Xue Ding1, Yuming Sun2, Qing Wang3, Tingting Pu1, Xiaohui Li4, Yaqing Pan1, Yang Yang1. 1. School of Pharmaceutical Science and Technology, Dalian University of Technology, Dalian, China. 2. Chemical Analysis and Research Center, Dalian University of Technology, Dalian, China. 3. School of Pharmaceutical Science and Technology, Dalian University of Technology, Dalian, China; State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian, China. Electronic address: qwang@dlut.edu.cn. 4. School of Life Science and Biotechnology, Dalian University of Technology, Dalian, China.
Abstract
BACKGROUND: Glycyrrhetinic acid (GA) and paeoniflorin (PF) are the main active ingredients in Chinese peony- Liquorice Decoction, a widely used Traditional Chinese Medicine. HYPOTHESIS/ PURPOSE: The aim of this work was to investigate the combinatory analgesic effect of GA and PF after percutaneous administration and to define their pharmacokinetic/pharmacodynamic (PK/PD) characteristics. STUDY DESIGN AND METHODS: GA and PF were produced to transdermal patches based on previous research, and the permeation parameters of GA and PF in the patches were investigated with in vitro experiments. Dysmenorrhea model mice were then produced to compare the analgesic effects of the patches with different proportions of GA-PF. In the in vivo assessment, the number of writhes exhibited by the dysmenorrhea mice was recorded at designated time points, and skin, muscle under skin and plasma samples were collected, for assessments of drug distribution, pharmacokinetics parameters and PK/PD characteristics. RESULTS AND CONCLUSION: In dysmenorrhea mice, GA-PF and meloxicam (the positive control drug) could relieve pain to equal degrees. Specifically, a single dose of the optimized patches (10%GA-10%PF, wt) exerted a steady analgesic effect for 48h in dysmenorrhea mice, but this effect lagged behind the changes in the plasma concentration. Evaluation with the Bliss Independence criterion revealed that the two ingredients displayed a synergistic effect. Then the PK/PD relationship of GA in this compound preparation was defined with this synergistic effect. The preparation might be suitable for topical spasmolysis and anti-inflammatory therapy.
BACKGROUND:Glycyrrhetinic acid (GA) and paeoniflorin (PF) are the main active ingredients in Chinese peony- Liquorice Decoction, a widely used Traditional Chinese Medicine. HYPOTHESIS/ PURPOSE: The aim of this work was to investigate the combinatory analgesic effect of GA and PF after percutaneous administration and to define their pharmacokinetic/pharmacodynamic (PK/PD) characteristics. STUDY DESIGN AND METHODS: GA and PF were produced to transdermal patches based on previous research, and the permeation parameters of GA and PF in the patches were investigated with in vitro experiments. Dysmenorrhea model mice were then produced to compare the analgesic effects of the patches with different proportions of GA-PF. In the in vivo assessment, the number of writhes exhibited by the dysmenorrheamice was recorded at designated time points, and skin, muscle under skin and plasma samples were collected, for assessments of drug distribution, pharmacokinetics parameters and PK/PD characteristics. RESULTS AND CONCLUSION: In dysmenorrheamice, GA-PF and meloxicam (the positive control drug) could relieve pain to equal degrees. Specifically, a single dose of the optimized patches (10%GA-10%PF, wt) exerted a steady analgesic effect for 48h in dysmenorrheamice, but this effect lagged behind the changes in the plasma concentration. Evaluation with the Bliss Independence criterion revealed that the two ingredients displayed a synergistic effect. Then the PK/PD relationship of GA in this compound preparation was defined with this synergistic effect. The preparation might be suitable for topical spasmolysis and anti-inflammatory therapy.
Authors: Ana Tada Fonseca Brasil Antiorio; Jilma Alemán-Laporte; Ana Paula Pauloni de Freitas; Pedro Kenzo Yamamoto; Luciana Cintra; Claudia Madalena Cabrera Mori Journal: Vet Res Commun Date: 2022-01-06 Impact factor: 2.459