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Inhibitory Effects of Antipsychotics on the Contractile Response To ←確認用doi (左上Y座標:-17.647 pt) 1140 Biol. Pharm. Bull. 44, 1140–1150 (2021) Vol. 44, No. 8 Regular Article Inhibitory Effects of Antipsychotics on the Contractile Response to Acetylcholine in Rat Urinary Bladder Smooth Muscles Keisuke Obara,*,a Yuka Matsuoka,a Naoya Iwata,a Yukako Abe, a Yohei Ikegami,a Nanako Shioda,a Yume Hattori,a Shoko Hamamatsu,a Kento Yoshioka, a Fumiko Yamaki,a,b Kazuhiro Matsuo,c Takashi Yoshio,c and Yoshio Tanakaa a Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, Toho University; 2–2–1 Miyama, Funabashi, Chiba 274–8510, Japan: b Department of Pharmacy, Faculty of Pharmacy, Musashino University; 1–1–20 Shinmachi, Nishitokyo, Tokyo 202–8585, Japan: and c Department of Clinical Pharmacy, Faculty of Pharmaceutical Sciences, Toho University; 2–2–1 Miyama, Funabashi, Chiba 274–8510, Japan. Received April 24, 2021; accepted May 27, 2021 The clinical applications of antipsychotics for symptoms unrelated to schizophrenia, such as behavioral and psychological symptoms, in patients with Alzheimer’s disease, and the likelihood of doctors prescrib- ing antipsychotics for elderly people are increasing. In elderly people, drug-induced and aging-associated urinary disorders are likely to occur. The most significant factor causing drug-induced urinary disorders is a decrease in urinary bladder smooth muscle (UBSM) contraction induced by the anticholinergic action of therapeutics. However, the anticholinergic action-associated inhibitory effects of antipsychotics on UBSM contraction have not been sufficiently assessed. In this study, we examined 26 clinically available antipsychot- ics to determine the extent to which they inhibit acetylcholine (ACh)-induced contraction in rat UBSM to predict the drugs that should not be used by elderly people to avoid urinary disorders. Of the 26 antipsychot- ics, six (chlorpromazine, levomepromazine (phenothiazines), zotepine (a thiepine), olanzapine, quetiapine, clozapine (multi-acting receptor targeted antipsychotics (MARTAs))) competitively inhibited ACh-induced contractions at concentrations corresponding to clinically significant doses. Further, 11 antipsychotics (per- phenazine, fluphenazine, prochlorperazine (phenothiazines), haloperidol, bromperidol, timiperone, spiperone (butyrophenones), pimozide (a diphenylbutylpiperidine), perospirone, blonanserin (serotonin–dopamine antagonists; SDAs), and asenapine (a MARTA)) significantly suppressed ACh-induced contraction; however, suppression occurred at concentrations substantially exceeding clinically achievable blood levels. The re- maining nine antipsychotics (pipamperone (a butyrophenone), sulpiride, sultopride, tiapride, nemonapride (benzamides), risperidone, paliperidone (SDAs), aripiprazole, and brexpiprazole (dopamine partial agonists)) did not inhibit ACh-induced contractions at concentrations up to 105 M. These findings suggest that chlor- promazine, levomepromazine, zotepine, olanzapine, quetiapine, and clozapine should be avoided by elderly people with urinary disorders. Key words antipsychotics; rat urinary bladder smooth muscle; anticholinergic effect; urinary disorder INTRODUCTION cause of age-related changes in pharmacokinetics and pharma- codynamics, current medical conditions, polypharmacy, and Antipsychotics are mainly utilized to treat schizophrenia; potential drug interactions.13) The U.S. Food and Drug Ad- however, in recent years, its application has extended to other ministration (FDA) issued an advisory and a subsequent black mental disorders, such as depression, behavioral and psycho- box warning regarding the risks of atypical antipsychotic use logical symptoms of dementia (BPSD), and gastrointestinal among elderly patients with dementia.14) Owing to the issu- symptoms associated with chemotherapy.1–5) As a result, the ance of this black box warning, many clinical studies on the prescription of antipsychotics has been increasing world- serious side effects of antipsychotics have been carried out.13) wide.6–8) Owing to the increase in human life span, elderly However, little information is available on the side effects that patients with mental disorders, Alzheimer's dementia, and clearly lead to poorer QOL for patients but are not recognized cancer have also been increasing.9–11) Thus, the prescription as severe. Urinary disorders are one of the such side effects of antipsychotics for elderly patients is expected to rapidly induced by antipsychotics.15) In elderly people, drug-induced increase in the future. In support of this speculation, the pre- as well as aging-associated urinary disorders are likely to scription rate of antipsychotics for elderly patients in Japan occur.16) Drug-induced urinary disorders affect patient adher- was found to increase by ≥10% between 2006 and 2012.6) ence,17) and thus should be avoided. In general, elderly patients are more likely to develop ad- The most significant factor for drug-induced urinary disor- verse effects than middle-age patients are. For example, elder- ders is a decrease in urinary bladder smooth muscle (UBSM) ly patients are more prone to antipsychotic-induced movement contraction due to anticholinergic actions.18) Among antipsy- disorders12) and are at an increased risk of adverse events due chotics, there is no significant difference in the rate of side to the intake of atypical antipsychotics (serotonin–dopamine effects caused by anticholinergic actions between patients antagonists (SDAs), multi-acting receptor targeted antipsychot- taking typical antipsychotics and those taking atypical anti- ics (MARTAs), dopamine partial agonists (DPAs)); this is be- psychotics.15) However, little information is available on which * To whom correspondence should be addressed. e-mail: [email protected] © 2021 The Pharmaceutical Society of Japan Vol. 44, No. 8 (2021) Biol. Pharm. Bull. 1141 antipsychotics inhibit UBSM contractility through their pos- to the bath medium. After a 30 min equilibration period, to sible anticholinergic actions. produce sustained contractions, the strip was contracted with In this study, we determined the potential inhibitory effects 80 mM high-KCl solution (containing atropine, prazosin, and of 26 clinically available antipsychotics on acetylcholine propranolol) comprising (mM): NaCl, 79.6; KCl, 80; CaCl2, (ACh)-induced contractions in rat UBSM. We then compared 2.2; MgCl2, 2.1; NaHCO3, 5.9; and glucose, 2.8. When the the drug concentrations required to produce inhibitory effects contractile response reached a steady state, each antipsychotic against ACh-induced contractions with their clinically achiev- was incrementally applied to the bath medium. At the end of able concentration ranges to predict the antipsychotics that the experiment, the UBSM preparations were treated with should be avoided in elderly patients with urinary disorders. verapamil (10−5 M). We considered that rat UBSM is suitable for evaluating the Drugs The 26 antipsychotics tested in this study were: le- anticholinergic potencies of drugs for the following reasons: 1) vomepromazine maleate, fluphenazine dimaleate, haloperidol, ACh-induced contractions in both rat and human UBSMs are sultopride hydrochloride, and perospirone hydrochloride dihy- mediated through M3 receptors, although the expression level drate (FUJIFILM Wako Pure Chemical Corporation, Osaka, of M2 receptors is higher than that of M3 receptors in their Japan); chlorpromazine hydrochloride, prochlorperazine di- UBSMs19); 2) The binding properties of various muscarinic maleate, pipamperone, (±)-sulpiride, tiapride hydrochloride, receptor antagonists (such as M1 receptor antagonist, pirenz- paliperidone, blonanserin, olanzapine, and aripiprazole (Tokyo epine; M2 receptor antagonist, AF-DX 116; and M3 receptor Chemical Industry Co., Ltd., Tokyo, Japan); perphenazine, antagonist, darifenacin) to rat UBSM are almost identical spiperone hydrochloride, quetiapine hemifumarate, clozapine, to their binding properties to human UBSM, although the brexpiprazole, and pimozide (Cayman Chemical, Ann Arbor, binding properties of β3-adrenoceptor agonists/antagonists MI, U.S.A.); bromperidol (MedChemExpress Co., Ltd., Mon- to rat UBSM differ from their binding properties to human mouth Junction, NJ, U.S.A.); timiperone (Toronto Research UBSM.20) Chemicals, Toronto, ON, Canada); nemonapride, and zotepine (Santa Cruz Biotechnology Inc., Dallas, TX, U.S.A.); risperi- MATERIALS AND METHODS done (Acros Organics, Geel, Belgium); and asenapine maleate (AdooQ BioScience LLC, Irvine, CA, U.S.A.). ACh chloride Animals Male Wistar rats (age, 8–10 weeks old; weight, was purchased from Daiichi Sankyo Co., Ltd. (Tokyo, Japan). 175–280 g; Japan SLC, Hamamatsu, Japan) were housed under Atropine sulfate, indomethacin, propranolol hydrochloride, controlled conditions (21–22°C, relative air humidity 50 ± 5%) and (±)-verapamil were purchased from Sigma-Aldrich Co. and a fixed 12–12 h light–dark cycle (08 : 00–20 : 00), with food (St. Louis, MO, U.S.A.). All other chemicals were commer- and water available ad libitum. This study was approved by cially available and of reagent grade. the Toho University Animal Care and Use Committee (Ap- Fluphenazine and clozapine were dissolved in 0.1 N HCl to proval Nos. 17-53-294, 18-54-294, 19-55-294) and was con- create a stock solution of 2 × 10−2 M. Thereafter, the stock so- ducted in accordance with the guidelines of the Laboratory lutions were further diluted with distilled water to the desired Animal Center of Faculty of Pharmaceutical Sciences, Toho concentrations. The other antipsychotics
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