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Shiho M, Akashita G, Nakatani E, Tanaka S, Yamada S, Okura T. Predicting muscarinic receptor occupancy in human bladder mucosa from urinary concentrations of antimuscarinic agents for overactive bladder. Drug Metab Pharmacokinet 2024; 56:100998. [PMID: 38583388 DOI: 10.1016/j.dmpk.2024.100998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 11/28/2023] [Accepted: 01/06/2024] [Indexed: 04/09/2024]
Abstract
To assess the pharmacologically relevant and selective muscarinic receptor occupancy in the bladder mucosa, we considered not only plasma drug concentrations but also urinary drug concentrations. The purpose of this study was to predict muscarinic receptor occupancy in the human bladder mucosa based on urinary concentrations in response to clinical dosages of antimuscarinic agents used to treat overactive bladder. The calculated mean plasma or serum unbound steady state concentrations were 0.06-11 nM in clinical dosages of five antimuscarinic agents. Urinary concentrations calculated from the mean plasma or serum and renal clearance ranged between 19 nM and 2 μM, which were >10-fold higher than the Ki values for bladder muscarinic receptors excluding propiverine. Bladder mucosal muscarinic receptor occupancy estimated from the urinary concentrations and the Ki values was >90 % at a steady state in clinical dosages of five antimuscarinic agents. The bladder muscarinic receptor occupancy was higher than that in the parotid gland calculated based on the mean plasma or serum unbound concentrations and Ki values for muscarinic receptors in the parotid gland. These results suggest that sufficient and selective muscarinic receptor occupancy by antimuscarinic agents, to exert pharmacological effects, in the bladder mucosa can be predicted using urinary concentrations.
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Affiliation(s)
- Mizuki Shiho
- Faculty of Pharma-Science, Teikyo University, Japan
| | | | | | | | - Shizuo Yamada
- Center for Pharma-Food Research (CPFR), Graduate School of Pharmaceutical Sciences, University of Shizuoka, Japan
| | - Takashi Okura
- Faculty of Pharma-Science, Teikyo University, Japan.
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Bartosińska E, Kozlík P, Kubíčková A, Heřt J, Fischer J, Křížek T. Comparison of static and dynamic mode in the electrochemical oxidation of fesoterodine with the use of experimental design approach. Talanta 2021; 226:122141. [PMID: 33676692 DOI: 10.1016/j.talanta.2021.122141] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 01/19/2021] [Accepted: 01/21/2021] [Indexed: 01/23/2023]
Abstract
Electrochemical conversion of fesoterodine to one of its oxidation products was evaluated with the application of the wall-jet flow cell. A traditional, "static" mode of electrolysis was compared with the "dynamic" mode of cell performance. For statistical assessment of the data, experiments were planned and performed with the application of design of experiments approach, namely Taguchi L18 design. After screening phase, the experimental settings were broadened or adjusted according to the results and optimization was performed. All of the samples were electrolysed with the use of chronoamperometric method in a three electrode system. The electrolysed samples were analysed using UHPLC-PDA-QDA method. The chromatographic run was performed in gradient elution with the application of C8 column. The response was expressed as % area of the main peak found with the PDA detection method whereas QDA detector was used in positive SIM mode for structural confirmation. All data obtained for both screening and optimization were treated together and linear models were adjusted. The use of large-surface glassy carbon electrode along with pH~7 were found to be the most significant factors influencing electrochemical oxidation of fesoterodine in both modes. The major differences were identified in terms of voltage applied to the electrodes which yielded the highest amounts of oxidation product. Evolution of electrochemical methods may serve as complementary technique in stress degradation studies in pharmaceutical industry.
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Affiliation(s)
- Ewa Bartosińska
- Charles University, Faculty of Science, Department of Analytical Chemistry, Albertov 6, Prague, 12843, Czech Republic
| | - Petr Kozlík
- Charles University, Faculty of Science, Department of Analytical Chemistry, Albertov 6, Prague, 12843, Czech Republic
| | - Anna Kubíčková
- Charles University, Faculty of Science, Department of Analytical Chemistry, Albertov 6, Prague, 12843, Czech Republic
| | - Jakub Heřt
- Zentiva, K.s. U Kabelovny 130, 102 37, Prague, Czech Republic
| | - Jan Fischer
- Charles University, Faculty of Science, Department of Analytical Chemistry, Albertov 6, Prague, 12843, Czech Republic
| | - Tomáš Křížek
- Charles University, Faculty of Science, Department of Analytical Chemistry, Albertov 6, Prague, 12843, Czech Republic.
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Yamada S, Kuraoka S, Ito Y, Kagota S, Shinozuka K, Onoue S. Direct in vitro and in vivo demonstration of muscarinic receptor binding by the novel radioligand, [ 3H]5-hydroxymethyltolterodine, in the bladder and other tissues of rats. J Pharmacol Sci 2020; 142:127-130. [PMID: 31889618 DOI: 10.1016/j.jphs.2019.12.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 09/06/2019] [Accepted: 09/12/2019] [Indexed: 11/28/2022] Open
Abstract
In vitro and in vivo binding sites of [3H]-labeled 5-hydroxymethyltolterodine (5-HMT), a new radioligand for labeling muscarinic receptors in rat tissues were characterized. Specific [3H]5-HMT binding in rat tissues was saturable and of high affinity in each tissue. The dissociation constant (Kd) was significantly lower in bladder and heart than in submaxillary gland. Significant levels of in vivo specific [3H]5-HMT binding by intravenous injection of the radioligand were detected in tissues, except for cerebral cortex. Thus, [3H]5-HMT was shown to specifically label muscarinic receptors in rat tissues, suggesting a useful radioligand for labeling muscarinic receptors with high affinity.
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Affiliation(s)
- Shizuo Yamada
- Center for Pharma-Food Research (CPFR), Shizuoka, Japan.
| | - Shiori Kuraoka
- Department of Pharmacokinetics and Pharmacodynamics, Graduate School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka, Japan
| | - Yoshihiko Ito
- Center for Pharma-Food Research (CPFR), Shizuoka, Japan
| | - Satomi Kagota
- Department of Pharmacology II, School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, Nishinomiya, Japan
| | - Kazumasa Shinozuka
- Department of Pharmacology II, School of Pharmacy and Pharmaceutical Sciences, Mukogawa Women's University, Nishinomiya, Japan
| | - Satomi Onoue
- Department of Pharmacokinetics and Pharmacodynamics, Graduate School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka, Japan
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Sugaya K, Yamagami H, Nishijima S, Kadekawa K, Hizue M, Ito Y, Yamada S. Effects of combined treatment with fesoterodine and mirabegron in a pelvic congestion rat model: Results from in vitro and in vivo functional studies. Low Urin Tract Symptoms 2019; 12:173-179. [PMID: 31758673 PMCID: PMC7217205 DOI: 10.1111/luts.12296] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Revised: 09/27/2019] [Accepted: 10/14/2019] [Indexed: 12/26/2022]
Abstract
Objectives To examine the effect of combining a nonselective muscarinic receptor antagonist, 5‐hydroxymethyl tolterodine (an active metabolite of fesoterodine), with a β3 adrenoceptor agonist, mirabegron, in a rat model of pelvic congestion. Methods The rat pelvic congestion model used female Sprague‐Dawley rats with their bilateral common iliac and uterine veins ligated. Expressions of M2 and M3 receptor subtypes in the urothelium and detrusor were detected by real‐time polymerase chain reaction assays. The effects of both drugs were investigated on isolated bladder strips contracted by electrical field stimulation. in vivo single cystometry was used to assess the effects of 5‐hydroxymethyl tolterodine and mirabegron independently or in combination on bladder capacity, micturition pressure, and threshold pressure. Results Pelvic congestion rats showed decreased bladder capacity compared with controls, but micturition pressure and threshold pressure were unchanged. Pelvic congestion model rats also demonstrated an approximately two‐fold increase in expression of both M2 and M3 receptor subtypes in the urothelium. Additive relaxant effects of 5‐hydroxymethyl tolterodine and mirabegron were observed in vitro in the electrical field stimulation‐induced contractions of bladder strips from pelvic congestion rats. In vivo, bladder capacity was increased significantly by a combination of 5‐hydroxymethyl tolterodine and mirabegron, with the combined effect exceeding the sum of the effects of monotherapies. Micturition pressure and threshold pressure did not significantly differ between groups. Conclusions The combination of 5‐hydroxymethyl tolterodine with mirabegron suggests the potential of synergistic effects in a rat pelvic congestion model.
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Affiliation(s)
| | | | | | | | | | - Yoshihiko Ito
- Center for Pharma-Food Research, Graduate School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka, Japan
| | - Shizuo Yamada
- Center for Pharma-Food Research, Graduate School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka, Japan
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Muscarinic receptor binding of fesoterodine, 5-hydroxymethyl tolterodine, and tolterodine in rat tissues after the oral, intravenous, or intravesical administration. J Pharmacol Sci 2019; 140:73-78. [PMID: 31153768 DOI: 10.1016/j.jphs.2019.05.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 04/19/2019] [Accepted: 04/26/2019] [Indexed: 12/23/2022] Open
Abstract
The present study aimed to characterize muscarinic receptor binding of fesoterodine, 5-hydroxymethyl tolterodine (5-HMT), and tolterodine in bladder and other tissues of rats after their oral, intravenous, or intravesical administration. Muscarinic receptors in tissues were measured by using [N-methyl-3H]scopolamine methyl chloride ([3H]NMS). The in vitro binding affinity for muscarinic receptors was the highest by 5-HMT, followed by tolterodine and fesoterodine. Fesoterodine exhibited lower affinity in rat submaxillary gland than in detrusor muscle and urothelium. Muscarinic binding affinities of 5-HMT and tolterodine were similar among tissues. The duration of binding of oral fesoterodine to muscarinic receptors was longer in bladder than in submaxillary gland, heart, and lung, and its binding was little observed in colon and cerebral cortex. Binding activity of intravenous 5-HMT to muscarinic receptors was significantly observed in all tissues, except cerebral cortex, with a longer duration in bladder. Significant binding of bladder detrusor and urothelial muscarinic receptors was observed following intravesical instillation of 5-HMT. This selectivity may be attributed to the direct blockade of bladder receptors by excreted urinary 5-HMT. Thus, fesoterodine may be efficacious as a treatment for patients with overactive bladder.
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Yamada S. [Integration of pharmacokinetics and pharmacodynamics based on the in vivo analysis of drug-receptor binding]. YAKUGAKU ZASSHI 2015; 135:137-50. [PMID: 25743911 DOI: 10.1248/yakushi.14-00217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
As I was deeply interested in the effects of drugs on the human body, I chose pharmacology as the subject of special study when I became a 4th year student at Shizuoka College of Pharmacy. I studied abroad as a postdoctoral fellow for two years, from 1978, under the tutelage of Professor Henry I. Yamamura (pharmacology) in the College of Medicine at the University of Arizona, USA. He taught me a variety of valuable skills such as the radioreceptor binding assay, which represented the most advanced technology developed in the US at that time. After returning home, I engaged in clarifying receptor abnormalities in pathological conditions, as well as in drug action mechanisms, by making the best use of this radioreceptor binding assay. In 1989, following the founding of the University of Shizuoka, I was invited by Professor Ryohei Kimura to join the Department of Pharmacokinetics. This switch in discipline provided a good opportunity for me to broaden my perspectives in pharmaceutical sciences. I worked on evaluating drug-receptor binding in vivo as a combined index for pharmacokinetics and pharmacological effect manifestation, with the aim of bridging pharmacology and pharmacokinetics. In fact, by focusing on data from in vivo receptor binding, it became possible to clearly rationalize the important consideration of drug dose-concentration-action relationships, and to study quantitative and kinetic analyses of relationships among pharmacokinetics, receptor binding and pharmacological effects. Based on this concept, I was able to demonstrate the utility of dynamic analyses of drug-receptor binding in drug discovery, drug fostering, and the proper use of pharmacokinetics with regard to many drugs.
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Affiliation(s)
- Shizuo Yamada
- Center for Pharma-Food Research (CPFR), Graduate School of Pharmaceutical Sciences, University of Shizuoka
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Hizue M, Ochi Y, Imura M, Yamagami H. [Pharmacological profile and clinical findings of fesoterodine (Toviaz®Tablets )]. Nihon Yakurigaku Zasshi 2014; 143:203-213. [PMID: 24717610 DOI: 10.1254/fpj.143.203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
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