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Yesilkaya UH, Balcioglu YH, Sen M. Psychotic Agitation in a Patient with COVID-19: Pathogenesis or Iatrogenesis? PSYCHIAT CLIN PSYCH 2021; 31:238-240. [PMID: 38765235 PMCID: PMC11079704 DOI: 10.5152/pcp.2021.21101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Accepted: 02/14/2021] [Indexed: 05/21/2024] Open
Abstract
The pathophysiological underpinnings of central nervous system (CNS) involvement in SARS-CoV-2 infection, as well as the profile of adverse neuropsychiatric effects of pharmacological agents employed in the management of COVID-19, are yet to be elucidated. Here, we report a 43-year-old female patient who suffered from COVID-19 and who developed new-onset psychotic agitated behavior which may be related to either the COVID-19 infection itself or to the drugs that were used in the treatment. On her third day of treatment with oseltamivir, hydroxychloroquine, and azithromycin, the patient, who had no previous background of neurological or psychiatric diagnosis, presented with a new-onset psychomotor agitation with auditory hallucinations and insomnia. Her psychiatric symptoms have improved with oral olanzapine 5 mg/d. This report underscores the importance of neuropsychiatric monitoring in patients with COVID-19. Clinicians should be aware of the limited knowledge on the neuropsychiatric safety profile of the medication used for COVID-19 treatment, while they have focused on the neuropsychiatric outcomes of COVID-19 itself.
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Affiliation(s)
- Umit Haluk Yesilkaya
- Department of Psychiatry, Bakirkoy Prof Mazhar Osman Training and Research Hospital for Psychiatry, Neurology, and Neurosurgery, Istanbul, Turkey
| | - Yasin Hasan Balcioglu
- Department of Psychiatry, Bakirkoy Prof Mazhar Osman Training and Research Hospital for Psychiatry, Neurology, and Neurosurgery, Istanbul, Turkey
| | - Meltem Sen
- Department of Psychiatry, Bakirkoy Prof Mazhar Osman Training and Research Hospital for Psychiatry, Neurology, and Neurosurgery, Istanbul, Turkey
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Abstract
ABSTRACT Oseltamivir is an antiviral drug often preferred in treating viral infections. Its use has increased owing to annual influenza outbreaks and the COVID-19 pandemic. Although its adverse effects are often seen in the gastrointestinal system, it has other adverse effects that can prevent its use, for example, neuropsychiatric events. In this case report, we present a manic episode case caused by the use of oseltamivir.
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3
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Shoji M, Sugimoto M, Matsuno K, Fujita Y, Mii T, Ayaki S, Takeuchi M, Yamaji S, Tanaka N, Takahashi E, Noda T, Kido H, Tokuyama T, Tokuyama T, Tokuyama T, Kuzuhara T. A novel aqueous extract from rice fermented with Aspergillus oryzae and Saccharomyces cerevisiae possesses an anti-influenza A virus activity. PLoS One 2021; 16:e0244885. [PMID: 33449947 PMCID: PMC7810313 DOI: 10.1371/journal.pone.0244885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Accepted: 12/17/2020] [Indexed: 11/24/2022] Open
Abstract
Human influenza virus infections occur annually worldwide and are associated with high morbidity and mortality. Hence, development of novel anti-influenza drugs is urgently required. Rice Power® extract developed by the Yushin Brewer Co. Ltd. is a novel aqueous extract of rice obtained via saccharization and fermentation with various microorganisms, such as Aspergillus oryzae, yeast [such as Saccharomyces cerevisiae], and lactic acid bacteria, possessing various biological and pharmacological properties. In our previous experimental screening with thirty types of Rice Power® extracts, we observed that the 30th Rice Power® (Y30) extract promoted the survival of influenza A virus-infected Madin-Darby canine kidney (MDCK) cells. Therefore, to identify compounds for the development of novel anti-influenza drugs, we aimed to investigate whether the Y30 extract exhibits anti-influenza A virus activity. In the present study, we demonstrated that the Y30 extract strongly promoted the survival of influenza A H1N1 Puerto Rico 8/34 (A/PR/8/34), California 7/09, or H3N2 Aichi 2/68 (A/Aichi/2/68) viruses-infected MDCK cells and inhibited A/PR/8/34 or A/Aichi/2/68 viruses infection and growth in the co-treatment and pre-infection experiments. The pre-treatment of Y30 extract on MDCK cells did not induce anti-influenza activity in the cell. The Y30 extract did not significantly affect influenza A virus hemagglutination, and neuraminidase and RNA-dependent RNA polymerase activities. Interestingly, the electron microscopy experiment revealed that the Y30 extract disrupts the integrity of influenza A virus particles by permeabilizing the viral membrane envelope, suggesting that Y30 extract has a direct virucidal effect against influenza A virus. Furthermore, we observed that compared to the ethyl acetate (EtOAc) extract, the water extract of Y30 extract considerably promoted the survival of cells infected with A/PR/8/34 virus. These results indicated that more anti-influenza components were present in the water extract of Y30 extract than in the EtOAc extract. Our results highlight the potential of a rice extract fermented with A. oryzae and S. cerevisiae as an anti-influenza medicine and a drug source for the development of anti-influenza compounds.
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Affiliation(s)
- Masaki Shoji
- Faculty of Pharmaceutical Sciences, Laboratory of Biochemistry, Tokushima Bunri University, Yamashiro-cho, Tokushima, Japan
- * E-mail: (MS); (TK)
| | - Minami Sugimoto
- Faculty of Pharmaceutical Sciences, Laboratory of Biochemistry, Tokushima Bunri University, Yamashiro-cho, Tokushima, Japan
| | - Kosuke Matsuno
- Yushin Brewer Co. Ltd., Ono, Ayagawa-cho, Ayauta-gun, Kagawa, Japan
| | - Yoko Fujita
- Laboratory of Ultrastructural Virology, Graduate School of Biostudies, Kyoto University, Shogoin Kawahara-cho, Sakyo-ku, Kyoto, Japan
- Laboratory of Ultrastructural Virology, Institute for Frontier Life and Medical Sciences, Kyoto University, Shogoin Kawahara-cho, Sakyo-ku, Kyoto, Japan
| | - Tomohiro Mii
- Yushin Brewer Co. Ltd., Ono, Ayagawa-cho, Ayauta-gun, Kagawa, Japan
| | - Satomi Ayaki
- Yushin Brewer Co. Ltd., Ono, Ayagawa-cho, Ayauta-gun, Kagawa, Japan
| | - Misa Takeuchi
- Faculty of Pharmaceutical Sciences, Laboratory of Biochemistry, Tokushima Bunri University, Yamashiro-cho, Tokushima, Japan
| | - Saki Yamaji
- Faculty of Pharmaceutical Sciences, Laboratory of Biochemistry, Tokushima Bunri University, Yamashiro-cho, Tokushima, Japan
| | - Narue Tanaka
- Faculty of Pharmaceutical Sciences, Laboratory of Biochemistry, Tokushima Bunri University, Yamashiro-cho, Tokushima, Japan
| | - Etsuhisa Takahashi
- Division of Pathology and Metabolome Research for Infectious Disease and Host Defense, Institute for Enzyme Research, University of Tokushima, Kuramoto-cho, Tokushima, Japan
| | - Takeshi Noda
- Laboratory of Ultrastructural Virology, Graduate School of Biostudies, Kyoto University, Shogoin Kawahara-cho, Sakyo-ku, Kyoto, Japan
- Laboratory of Ultrastructural Virology, Institute for Frontier Life and Medical Sciences, Kyoto University, Shogoin Kawahara-cho, Sakyo-ku, Kyoto, Japan
| | - Hiroshi Kido
- Division of Pathology and Metabolome Research for Infectious Disease and Host Defense, Institute for Enzyme Research, University of Tokushima, Kuramoto-cho, Tokushima, Japan
| | - Takaaki Tokuyama
- Yushin Brewer Co. Ltd., Ono, Ayagawa-cho, Ayauta-gun, Kagawa, Japan
| | | | - Takashi Tokuyama
- Yushin Brewer Co. Ltd., Ono, Ayagawa-cho, Ayauta-gun, Kagawa, Japan
| | - Takashi Kuzuhara
- Faculty of Pharmaceutical Sciences, Laboratory of Biochemistry, Tokushima Bunri University, Yamashiro-cho, Tokushima, Japan
- * E-mail: (MS); (TK)
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4
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Fukushima Y, Kojima A, Mi X, Ding WG, Kitagawa H, Matsuura H. Open-channel blocking action of volatile anaesthetics desflurane and sevoflurane on human voltage-gated K v 1.5 channel. Br J Pharmacol 2020; 177:3811-3827. [PMID: 32436224 DOI: 10.1111/bph.15105] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Revised: 04/28/2020] [Accepted: 05/01/2020] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND AND PURPOSE Volatile anaesthetics have been shown to differentially modulate mammalian Shaker-related voltage-gated potassium (Kv 1.x) channels. This study was designed to investigate molecular and cellular mechanisms underlying the modulatory effects of desflurane or sevoflurane on human Kv 1.5 (hKv 1.5) channels. EXPERIMENTAL APPROACH Thirteen single-point mutations were constructed within pore domain of hKv 1.5 channel using site-directed mutagenesis. The effects of desflurane or sevoflurane on heterologously expressed wild-type and mutant hKv 1.5 channels were examined by whole-cell patch-clamp technique. A computer simulation was conducted to predict the docking pose of desflurane or sevoflurane within hKv 1.5 channel. KEY RESULTS Both desflurane and sevoflurane increased hKv 1.5 current at mild depolarizations but decreased it at strong depolarizations, indicating that these anaesthetics produce both stimulatory and inhibitory actions on hKv 1.5 channels. The inhibitory effect of desflurane or sevoflurane on hKv 1.5 channels arose primarily from its open-channel blocking action. The inhibitory action of desflurane or sevoflurane on hKv 1.5 channels was significantly attenuated in T480A, V505A, and I508A mutant channels, compared with wild-type channel. Computational docking simulation predicted that desflurane or sevoflurane resides within the inner cavity of channel pore and has contact with Thr479, Thr480, Val505, and Ile508. CONCLUSION AND IMPLICATIONS Desflurane and sevoflurane exert an open-channel blocking action on hKv 1.5 channels by functionally interacting with specific amino acids located within the channel pore. This study thus identifies a novel molecular basis mediating inhibitory modulation of hKv 1.5 channels by desflurane and sevoflurane.
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Affiliation(s)
- Yutaka Fukushima
- Department of Physiology, Shiga University of Medical Science, Otsu, Japan.,Department of Anesthesiology, Shiga University of Medical Science, Otsu, Japan
| | - Akiko Kojima
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Japan
| | - Xinya Mi
- Department of Physiology, Shiga University of Medical Science, Otsu, Japan
| | - Wei-Guang Ding
- Department of Physiology, Shiga University of Medical Science, Otsu, Japan
| | - Hirotoshi Kitagawa
- Department of Anesthesiology, Shiga University of Medical Science, Otsu, Japan
| | - Hiroshi Matsuura
- Department of Physiology, Shiga University of Medical Science, Otsu, Japan
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Tanigami H, Yoneda M, Tabata Y, Echigo R, Kikuchi Y, Yamazaki M, Kishimoto Y, Sakimura K, Kano M, Ohno-Shosaku T. Endocannabinoid Signaling from 2-Arachidonoylglycerol to CB 1 Cannabinoid Receptor Facilitates Reward-based Learning of Motor Sequence. Neuroscience 2019; 421:1-16. [PMID: 31682822 DOI: 10.1016/j.neuroscience.2019.09.040] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Revised: 09/17/2019] [Accepted: 09/30/2019] [Indexed: 12/27/2022]
Abstract
The endocannabinoid system modulates synaptic transmission, controls neuronal excitability, and is involved in various brain functions including learning and memory. 2-arachidonoylglycerol, a major endocannabinoid produced by diacylglycerol lipase-α (DGLα), is released from postsynaptic neurons, retrogradely activates presynaptic CB1 cannabinoid receptors, and induces short-term or long-term synaptic plasticity. To examine whether and how the endocannabinoid system contributes to reward-based learning of a motor sequence, we subjected male CB1-knockout (KO) and DGLα-KO mice to three types of operant lever-press tasks. First, we trained mice to press one of three levers labeled A, B, and C for a food reward (one-lever task). Second, we trained mice to press the three levers in the order of A, B, and C (three-lever task). Third, the order of the levers was reversed to C, B, and A (reverse three-lever task). We found that CB1-KO mice and DGLα-KO mice exhibited essentially the same deficits in the operant lever-press tasks. In the one-lever task, both strains of knockout mice showed a slower rate of learning to press a lever for food. In the three-lever task, both strains of knockout mice showed a slower rate of learning of the motor sequence. In the reverse three-lever task, both strains of knockout mice needed more lever presses for reversal learning. These results suggest that the endocannabinoid system facilitates reward-based learning of a motor sequence by conferring the flexibility with which animals can switch between strategies.
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Affiliation(s)
- Hayate Tanigami
- Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa 920-0942, Japan
| | - Mitsugu Yoneda
- Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa 920-0942, Japan
| | - Yuki Tabata
- Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa 920-0942, Japan
| | - Ryosuke Echigo
- Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa 920-0942, Japan
| | - Yui Kikuchi
- Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa 920-0942, Japan
| | - Maya Yamazaki
- Department of Cellular Neurobiology, Brain Research Institute, Niigata University, Niigata 951-8585, Japan
| | - Yasushi Kishimoto
- Laboratory of Neurobiophysics, Kagawa School of Pharmaceutical Sciences, Tokushima Bunri University, Sanuki, Kagawa 769-2193, Japan
| | - Kenji Sakimura
- Department of Cellular Neurobiology, Brain Research Institute, Niigata University, Niigata 951-8585, Japan
| | - Masanobu Kano
- Department of Neurophysiology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan; International Research Center for Neurointelligence (WPI-IRCN), The University of Tokyo Institutes for Advanced Study (UTIAS), The University of Tokyo, Tokyo 113-0033, Japan
| | - Takako Ohno-Shosaku
- Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa 920-0942, Japan.
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Kang HR, Lee EK, Kim WJ, Shin JY. Risk of neuropsychiatric adverse events associated with the use of oseltamivir: a nationwide population-based case-crossover study. J Antimicrob Chemother 2018; 74:453-461. [DOI: 10.1093/jac/dky445] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2018] [Accepted: 10/02/2018] [Indexed: 11/14/2022] Open
Affiliation(s)
- Hye-Rim Kang
- School of Pharmacy, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, South Korea
| | - Eui-Kyung Lee
- School of Pharmacy, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, South Korea
| | - Woo Jung Kim
- Department of Psychiatry, Myongji Hospital, Hanyang University Medical Center, 55, Hwasu-ro 14beon-gil, Deogyang-gu, Goyang, Gyeonggi-do, South Korea
| | - Ju-Young Shin
- School of Pharmacy, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, South Korea
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7
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Ono H, Okamura M, Fukushima A. [Similarity of Clinically Significant Neuropsychiatric Adverse Reactions Listed in Package Inserts between the Anti-influenza Drugs Oseltamivir and Amantadine (Possibility Attributable to Common Pharmacological Effects)]. YAKUGAKU ZASSHI 2018; 138:1201-1215. [PMID: 29925727 DOI: 10.1248/yakushi.18-00022] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The anti-influenza virus drug oseltamivir has been reported to have several pharmacological actions including blocking of nicotinic acetylcholine receptor channels and activation of the dopaminergic system. These pharmacological actions highly overlap those of amantadine, another anti-influenza virus drug authorized in Japan, and ester-type local anesthetics. Moreover, oseltamivir and amantadine can clinically induce similar adverse neuropsychiatric reactions. In the present study, from the database of the Pharmaceuticals and Medical Devices Agency (PMDA), we surveyed 2576 drugs for which neuropsychiatric side effects similar to those of oseltamivir, amantadine and local anesthetics (abnormal behavior, confusion, consciousness disturbance, convulsion, delirium, delusion, hallucination, myoclonus, tremor) are listed as "clinically significant adverse reactions", and found 327 that had at least one of these adverse reactions. Other neuraminidase inhibitors (laninamivir, peramivir and zanamivir) did not elicit such adverse reactions. By discussing the pharmacological effects of drugs that elicit these adverse reactions, we propose that the similarity of adverse neuropsychiatric reactions between oseltamivir and amantadine is possibly attributable to their common pharmacological effects.
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Affiliation(s)
- Hideki Ono
- Laboratory of Clinical Pharmacy and Pharmacology, Faculty of Pharmacy, Musashino University.,Research Institute of Pharmaceutical Sciences, Musashino University
| | - Maya Okamura
- Laboratory of Clinical Pharmacy and Pharmacology, Faculty of Pharmacy, Musashino University
| | - Akihiro Fukushima
- Laboratory of Clinical Pharmacy and Pharmacology, Faculty of Pharmacy, Musashino University.,Research Institute of Pharmaceutical Sciences, Musashino University
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Kukula-Koch W, Koch W, Czernicka L, Głowniak K, Asakawa Y, Umeyama A, Marzec Z, Kuzuhara T. MAO-A Inhibitory Potential of Terpene Constituents from Ginger Rhizomes-A Bioactivity Guided Fractionation. Molecules 2018; 23:E1301. [PMID: 29844252 PMCID: PMC6099963 DOI: 10.3390/molecules23061301] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 05/28/2018] [Accepted: 05/28/2018] [Indexed: 01/18/2023] Open
Abstract
BACKGROUND In the search for novel antidepressive drug candidates, bioguided fractionation of nonpolar constituents present in the oleoresin from ginger rhizomes (Zingiber officinale Roscoe, Zingiberaceae) was performed. This particular direction of the research was chosen due to the existing reports on the antidepressive properties of ginger total extract. The search for individual metabolites acting as MAO-A inhibitors, which correspond to the apparent effect of the total extract, is the subject of this work. METHODS Hexane extracts from ginger rhizomes were fractionated by using column chromatography (including silica gel impregnated with silver nitrate) and semi-preparative high-performance chromatography. For the activity assessment, an in vitro monoamine oxidase A (MAO-A) inhibition luminescence assay was performed on 10 purified terpenes: 1,8-cineole, α-citronellal, geraniol, β-sesquiphellandrene, γ-terpinen, geranyl acetate, isobornyl acetate, terpinen-4-ol, (E,E)-α-farnesene, and α-zingiberene. RESULTS Geraniol and (-)-terpinen-4-ol were found to be the strongest enzyme inhibitors with inhibition of 44.1% and 42.5%, respectively, at a concentration of 125 µg/mL. No differences in the inhibition potential were observed for the different groups of terpenes: sesquiterpenes, monoterpenes, or sesquiterpene alcohols; however, the two most active compounds contained a hydroxyl moiety. CONCLUSIONS Terpene constituents from ginger's extract were found to exhibit moderate inhibitory properties against the MAO-A enzyme in in vitro tests.
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Affiliation(s)
- Wirginia Kukula-Koch
- Chair and Department of Pharmacognosy with Medical Plant Unit, Medical University of Lublin, 1 Chodźki Str., 20-093 Lublin, Poland.
| | - Wojciech Koch
- Chair and Department of Food and Nutrition, Medical University of Lublin, 4a Chodźki Str., 20-093 Lublin, Poland.
| | - Lidia Czernicka
- Chair and Department of Food and Nutrition, Medical University of Lublin, 4a Chodźki Str., 20-093 Lublin, Poland.
| | - Kazimierz Głowniak
- Chair and Department of Pharmacognosy with Medical Plant Unit, Medical University of Lublin, 1 Chodźki Str., 20-093 Lublin, Poland.
- Department of Cosmetology, University of Information Technology and Management in Rzeszów, Kielnarowa 386a, 36-020 Tyczyn, Poland.
| | - Yoshinori Asakawa
- Department of Pharmaceutical Chemistry, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan.
| | - Akemi Umeyama
- Department of Pharmacognosy, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan.
| | - Zbigniew Marzec
- Chair and Department of Food and Nutrition, Medical University of Lublin, 4a Chodźki Str., 20-093 Lublin, Poland.
| | - Takashi Kuzuhara
- Laboratory of Biochemistry, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan.
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Fukushima A, Fukui A, Takemura Y, Maeda Y, Ono H. The anti-influenza drug oseltamivir evokes hypothermia in mice through dopamine D 2 receptor activation via central actions. J Pharmacol Sci 2018; 136:39-41. [PMID: 29292053 DOI: 10.1016/j.jphs.2017.12.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2017] [Revised: 11/11/2017] [Accepted: 12/04/2017] [Indexed: 11/18/2022] Open
Abstract
Oseltamivir has a hypothermic effect in mice when injected intraperitoneally (i.p.) and intracerebroventricularly (i.c.v.). Here we show that the hypothermia evoked by i.c.v.-oseltamivir is inhibited by non-selective dopamine receptor antagonists (sulpiride and haloperidol) and the D2-selective antagonist L-741,626, but not by D1/D5-selective and D3-selective antagonists (SCH-23390 and SB-277011-A, respectively). The hypothermic effect of i.p.-administered oseltamivir was not inhibited by sulpiride, haloperidol, L-741,626 and SCH-23390. In addition, neither sulpiride, haloperidol nor SCH-23390 blocked hypothermia evoked by i.c.v.-administered oseltamivir carboxylate (a hydrolyzed metabolite of oseltamivir). These results suggest that oseltamivir in the brain induces hypothermia through activation of dopamine D2 receptors.
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Affiliation(s)
- Akihiro Fukushima
- Laboratory of Clinical Pharmacy and Pharmacology, Faculty of Pharmacy, Musashino University, 1-1-20 Shinmachi, Nishitokyo-shi, Tokyo 202-8585, Japan; Research Institute of Pharmaceutical Sciences, Musashino University, 1-1-20 Shinmachi, Nishitokyo-shi, Tokyo 202-8585, Japan
| | - Arisa Fukui
- Laboratory of Clinical Pharmacy and Pharmacology, Faculty of Pharmacy, Musashino University, 1-1-20 Shinmachi, Nishitokyo-shi, Tokyo 202-8585, Japan
| | - Yuki Takemura
- Laboratory of Clinical Pharmacy and Pharmacology, Faculty of Pharmacy, Musashino University, 1-1-20 Shinmachi, Nishitokyo-shi, Tokyo 202-8585, Japan
| | - Yasuhiro Maeda
- Laboratory of Hospital Pharmacy, Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya 467-8603, Japan
| | - Hideki Ono
- Laboratory of Clinical Pharmacy and Pharmacology, Faculty of Pharmacy, Musashino University, 1-1-20 Shinmachi, Nishitokyo-shi, Tokyo 202-8585, Japan; Research Institute of Pharmaceutical Sciences, Musashino University, 1-1-20 Shinmachi, Nishitokyo-shi, Tokyo 202-8585, Japan.
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10
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Early Contextual Fear Memory Deficits in a Double-Transgenic Amyloid- β Precursor Protein/Presenilin 2 Mouse Model of Alzheimer's Disease. Int J Alzheimers Dis 2017; 2017:8584205. [PMID: 29333315 PMCID: PMC5733185 DOI: 10.1155/2017/8584205] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Revised: 10/31/2017] [Accepted: 11/06/2017] [Indexed: 11/17/2022] Open
Abstract
Presenilin 1 and presenilin 2 (PS1 and PS2) play a critical role in γ-secretase-mediated cleavage of amyloid-β precursor protein (APP) and the subsequent generation of β-amyloid peptides. The purpose of the present study was to test whether PS2 mutation accelerates the onset of contextual fear memory deficits in a mouse model of AD that expresses a mutation (K670N/M671L) of the human APP with the Swedish mutation (Tg2576 mice). In the present study, an APP/PS2 double-transgenic mouse model (PS2Tg2576) was generated by crossbreeding transgenic mice carrying the human mutant PS2 (N141I) with Tg2576 mice. Contextual fear conditioning was tested in PS2Tg2576 mice aged 3, 4, 6, and 10-12 months. PS2Tg2576 mice showed a tendency of lower freezing behavior as early as 3 months of age, but significant memory impairment was observed from the age of 4 months. The cognitive impairment was more prominent at ages of 6 and 10-12 months. In contrast, Tg2576 mice aged 3 and 4 months exhibited successful acquisition of contextual fear learning, but Tg2576 mice aged 6 months or older showed significantly impaired fear memory. These results show that PS2 mutation significantly accelerates the onset of fear memory deficits in the APP AD model mice.
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11
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Hatakeyama D. Structural and Biochemical Analyses on the RNA-dependent RNA Polymerase of Influenza Virus for Development of Novel Anti-influenza Agents. YAKUGAKU ZASSHI 2017; 137:205-214. [PMID: 28154333 DOI: 10.1248/yakushi.16-00195] [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
The PA, PB1, and PB2 subunits, components of the RNA-dependent RNA polymerase of influenza A virus, and the nucleoprotein (NP) interact with the genomic RNA of influenza viruses and form ribonucleoproteins. Especially, the PB2 subunit binds to the host RNA cap [7-methylguanosine triphosphate (m7GTP)] and supports the endonuclease activity of PA to "snatch" the cap from host pre-mRNAs. In this study, we describe a novel Val/Arg/Gly (VRG) site in the PB2 cap-binding domain, which is necessary for interaction with acetyl-CoA found in eukaryotic histone acetyltransferases (HATs). In vitro experiments revealed that the recombinant PB2 cap-binding domain that includes the VRG site interacts with acetyl-CoA; moreover, it was found that this interaction could be blocked by CoA and various HAT inhibitors. Interestingly, m7GTP also inhibited this interaction, suggesting that the same active pocket is capable of interacting with acetyl-CoA and m7GTP. To elucidate the importance of the VRG site on PB2 function and viral replication, we constructed a PB2 recombinant protein and recombinant viruses including several patterns of amino acid mutations in the VRG site. Substitutions of 2 or 3 amino acid residues of the VRG site to alanine significantly reduced PB2's binding ability to acetyl-CoA and its RNA polymerase activity. Recombinant viruses containing the same mutations could not be replicated in cultured cells. These results indicate that the PB2 VRG sequence is a functional site that is essential for acetyl-CoA interaction, RNA polymerase activity, and viral replication. I will also discuss some novel functions of NP in this review.
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Affiliation(s)
- Dai Hatakeyama
- Faculty of Pharmaceutical Sciences, Tokushima Bunri University
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12
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Hama R, Bennett CL. The mechanisms of sudden-onset type adverse reactions to oseltamivir. Acta Neurol Scand 2017; 135:148-160. [PMID: 27364959 PMCID: PMC5201449 DOI: 10.1111/ane.12629] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/09/2016] [Indexed: 01/13/2023]
Abstract
Oseltamivir is contraindicated for people aged 10-19 in principle in Japan, due to concern about abnormal behaviours. Sudden death is another concern. This review examines growing evidence of their association and discusses underlying mechanisms of these sudden-onset type reactions to oseltamivir. First, the importance of animal models and the concept of human equivalent dose (HED) is summarized. Second, the specific condition for oseltamivir use, influenza infection, is reviewed. Third, findings from toxicity studies conducted prior to and after the marketing of oseltamivir are reported on to provide context on the observation of a possible causal association. Fourth, similarity and consistency of toxicity in humans with that in other animals is described. Finally, coherence of toxicokinetic and molecular level of evidence (channels, receptors and enzymes), including differences from the toxicity of other neuraminidase inhibitors, is reviewed. It is concluded that unchanged oseltamivir has various effects on the central nervous system (CNS) that may be related to clinical findings including hypothermia, abnormal behaviours including with fatal outcome, and sudden death. Among receptors and enzymes related to CNS action, it is known that oseltamivir inhibits nicotinic acetylcholine receptors, which are closely related to hypothermia, as well as human monoamine oxidase-A (MAO-A), which is closely related to abnormal or excitatory behaviours. Receptors such as GABAA , GABAB and NMDA and their related receptors/channels including Na+ and Ca2+ channels are thought to be other candidates for investigation related to respiratory suppression followed by sudden death and psychotic reactions (both acute and chronic), respectively.
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Affiliation(s)
- R. Hama
- Non‐Profit Organization “Japan Institute of Pharmacovigilance”Tennoji‐kuOsakaJapan
| | - C. L. Bennett
- Center for Medication Safety and EfficacyUniversity of South CarolinaCollege of Pharmacy MemberHollings National Cancer InstituteCenter for Medication Safety and EfficacyUniversity of South CarolinaHollings National Cancer InstituteMedical University of South CarolinaColumbia and CharlestonSCUSA
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13
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Abstract
Oseltamivir is recommended for the treatment and prophylaxis of influenza in persons at higher risk for influenza complications such as individuals with diabetes, neuropsychiatric illnesses, and respiratory, cardiac, renal, hepatic or haematological diseases. However, a recent Cochrane review reported that reduction of antibody production, renal disorders, hyperglycaemia, psychiatric disorders, and QT prolongation may be related to oseltamivir use. The underlying mechanisms are reviewed. There is decisive evidence that administration of a clinically compatible dose of oseltamivir in mice challenged by a respiratory syncytial virus (RSV) that lacks a neuraminidase gene showed symptom-relieving effects and inhibition of viral clearance. These effects were accompanied by decreased level of T cell surface sialoglycosphingolipid (ganglioside) GM1 that is regulated by the endogenous neuraminidase in response to viral challenge. Clinical and non-clinical evidence supports the view that the usual dose of oseltamivir suppresses pro-inflammatory cytokines such as interferon-gamma, interleukin-6, and tumour necrosis factor-alpha almost completely with partial suppression of viral shedding in human influenza virus infection experiment. Animal toxicity tests support the clinical evidence with regard to renal and cardiac disorders (bradycardia and QT prolongation) and do not disprove the metabolic effect. Reduction of antibody production and cytokine induction and renal, metabolic, cardiac, and prolonged psychiatric disorders after oseltamivir use may be related to inhibition of the host’s endogenous neuraminidase. While the usual clinical dose of zanamivir may not have this effect, a higher dose or prolonged administration of zanamivir and other neuraminidase inhibitors may induce similar delayed reactions, including reduction of the antibody and/or cytokine production.
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Affiliation(s)
- Rokuro Hama
- a Non-Profit Organization, Japan Institute of Pharmacovigilance , Osaka , Japan
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14
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Park SJ, Yi B, Lee HS, Oh WY, Na HK, Lee M, Yang M. To quit or not: Vulnerability of women to smoking tobacco. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART C, ENVIRONMENTAL CARCINOGENESIS & ECOTOXICOLOGY REVIEWS 2016; 34:33-56. [PMID: 26669465 DOI: 10.1080/10590501.2015.1131539] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Tobacco smoking is currently on the rise among women, and can pose a greater health risk. In order to understand the nature of the increase in smoking prevalence among women, we focused on the vulnerability of women to smoking behaviors--smoking cessation or tobacco addiction--and performed a systematic review of the socioeconomic and intrinsic factors as well as tobacco ingredients that affect women's susceptibility to smoking tobacco. We observed that nicotine and other tobacco components including cocoa-relatives, licorice products, and menthol aggravate tobacco addiction in women rather than in men. Various genetic and epigenetic alterations in dopamine pathway and the pharmaco-kinetics and -dynamic factors of nicotine also showed potential evidences for high susceptibility to tobacco addiction in women. Therefore, we suggest systemic approaches to prevent tobacco smoking-related health risks, considering gene-environment-gender interaction.
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Affiliation(s)
- Se-Jung Park
- a Research Center for Cell Fate Control, College of Pharmacy, Sookmyung Women's University , Seoul , Republic of Korea
| | - Bitna Yi
- b Department of Neurosurgery , Stanford University School of Medicine , Stanford , California , USA
| | - Ho-Sun Lee
- a Research Center for Cell Fate Control, College of Pharmacy, Sookmyung Women's University , Seoul , Republic of Korea
| | - Woo-Yeon Oh
- a Research Center for Cell Fate Control, College of Pharmacy, Sookmyung Women's University , Seoul , Republic of Korea
| | - Hyun-Kyung Na
- a Research Center for Cell Fate Control, College of Pharmacy, Sookmyung Women's University , Seoul , Republic of Korea
| | - Minjeong Lee
- a Research Center for Cell Fate Control, College of Pharmacy, Sookmyung Women's University , Seoul , Republic of Korea
| | - Mihi Yang
- a Research Center for Cell Fate Control, College of Pharmacy, Sookmyung Women's University , Seoul , Republic of Korea
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15
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Shoji M, Arakaki Y, Esumi T, Kohnomi S, Yamamoto C, Suzuki Y, Takahashi E, Konishi S, Kido H, Kuzuhara T. Bakuchiol Is a Phenolic Isoprenoid with Novel Enantiomer-selective Anti-influenza A Virus Activity Involving Nrf2 Activation. J Biol Chem 2015; 290:28001-17. [PMID: 26446794 PMCID: PMC4646038 DOI: 10.1074/jbc.m115.669465] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Indexed: 12/21/2022] Open
Abstract
Influenza represents a substantial threat to human health and requires novel therapeutic approaches. Bakuchiol is a phenolic isoprenoid compound present in Babchi (Psoralea corylifolia L.) seeds. We examined the anti-influenza viral activity of synthetic bakuchiol using Madin-Darby canine kidney cells. We found that the naturally occurring form, (+)-(S)-bakuchiol, and its enantiomer, (-)-(R)-bakuchiol, inhibited influenza A viral infection and growth and reduced the expression of viral mRNAs and proteins in these cells. Furthermore, these compounds markedly reduced the mRNA expression of the host cell influenza A virus-induced immune response genes, interferon-β and myxovirus-resistant protein 1. Interestingly, (+)-(S)-bakuchiol had greater efficacy than (-)-(R)-bakuchiol, indicating that chirality influenced anti-influenza virus activity. In vitro studies indicated that bakuchiol did not strongly inhibit the activities of influenza surface proteins or the M2 ion channel, expressed in Chinese hamster ovary cells. Analysis of luciferase reporter assay data unexpectedly indicated that bakuchiol may induce some host cell factor(s) that inhibited firefly and Renilla luciferases. Next generation sequencing and KeyMolnet analysis of influenza A virus-infected and non-infected cells exposed to bakuchiol revealed activation of transcriptional regulation by nuclear factor erythroid 2-related factor (Nrf), and an Nrf2 reporter assay showed that (+)-(S)-bakuchiol activated Nrf2. Additionally, (+)-(S)-bakuchiol up-regulated the mRNA levels of two Nrf2-induced genes, NAD(P)H quinone oxidoreductase 1 and glutathione S-transferase A3. These findings demonstrated that bakuchiol had enantiomer-selective anti-influenza viral activity involving a novel effect on the host cell oxidative stress response.
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Affiliation(s)
- Masaki Shoji
- From the Laboratory of Biochemistry, Faculty of Pharmaceutical Sciences, and
| | - Yumie Arakaki
- From the Laboratory of Biochemistry, Faculty of Pharmaceutical Sciences, and
| | - Tomoyuki Esumi
- the Institute of Pharmacognosy, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Tokushima 770-8514, Japan
| | - Shuntaro Kohnomi
- the Department of Neurophysiology, Kagawa School of Pharmaceutical Sciences, Tokushima Bunri University, Kagawa 769-2193, Japan
| | - Chihiro Yamamoto
- the Institute of Pharmacognosy, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Tokushima 770-8514, Japan
| | - Yutaka Suzuki
- the Graduate School of Frontier Sciences, University of Tokyo, Kashiwa, Chiba 277-8568, Japan, and
| | - Etsuhisa Takahashi
- the Division of Enzyme Chemistry, Institute for Enzyme Research, Tokushima University, Tokushima 770-8503, Japan
| | - Shiro Konishi
- the Department of Neurophysiology, Kagawa School of Pharmaceutical Sciences, Tokushima Bunri University, Kagawa 769-2193, Japan
| | - Hiroshi Kido
- the Division of Enzyme Chemistry, Institute for Enzyme Research, Tokushima University, Tokushima 770-8503, Japan
| | - Takashi Kuzuhara
- From the Laboratory of Biochemistry, Faculty of Pharmaceutical Sciences, and
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16
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Fukushima A, Chazono K, Hashimoto Y, Iwajima Y, Yamamoto S, Maeda Y, Ohsawa M, Ono H. Oseltamivir produces hypothermic and neuromuscular effects by inhibition of nicotinic acetylcholine receptor functions: comparison to procaine and bupropion. Eur J Pharmacol 2015; 762:275-82. [PMID: 26049014 DOI: 10.1016/j.ejphar.2015.06.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Revised: 05/12/2015] [Accepted: 06/02/2015] [Indexed: 11/26/2022]
Abstract
Oseltamivir, an anti-influenza virus drug, induces marked hypothermia in normal mice. We have proposed that the hypothermic effect arises from inhibition of the nicotinic acetylcholine receptor function of sympathetic ganglion neurons which innervate the brown adipose tissue (a heat generator). It has been reported that local anesthetics inhibit nicotinic acetylcholine receptor function by acting on its ionic channels, and that bupropion, a nicotinic antagonist, induces hypothermia. In this study, we compared the effects of oseltamivir, procaine and bupropion on body temperature, cardiovascular function and neuromuscular transmission. Intraperitoneal administration of oseltamivir (100mg/kg), procaine (86.6mg/kg) and bupropion (86.7mg/kg) lowered the core body temperature of normal mice. At lower doses (10-30mg/kg oseltamivir, 8.7-26mg/kg procaine and bupropion), when administered subcutaneously, the three drugs antagonized the hypothermia induced by intraperitoneal injection of nicotine (1mg/kg). In anesthetized rats, intravenous oseltamivir (30-100mg/kg), procaine (10mg/kg) and bupropion (10mg/kg) induced hypotension and bradycardia. Oseltamivir alone (100mg/kg) did not inhibit neuromuscular twitch contraction of rats, but at 3-30mg/kg it augmented the muscle-relaxing effect of d-tubocurarine. Similar effects were observed when lower doses of procaine (10-30mg/kg) and bupropion (3-10mg/kg) were administered, suggesting that systemic administration of oseltamivir inhibits muscular nicotinic acetylcholine receptors. These results support the idea that the hypothermic effect of oseltamivir is due to its effects on sympathetic ganglia which innervate the brown adipose tissue, and suggest that oseltamivir may exert non-selective ion channel blocking effects like those of ester-type local anesthetics.
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Affiliation(s)
- Akihiro Fukushima
- Laboratory of Clinical Pharmacy and Pharmacology, Faculty of Pharmacy and Research Institute of Pharmaceutical Sciences, Musashino University, 1-1-20 Shinmachi, Nishitokyo-shi, Tokyo 202-8585, Japan
| | - Kaori Chazono
- Laboratory of CNS Pharmacology, Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya 467-8603, Japan
| | - Yuichi Hashimoto
- Laboratory of CNS Pharmacology, Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya 467-8603, Japan
| | - Yui Iwajima
- Laboratory of CNS Pharmacology, Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya 467-8603, Japan
| | - Shohei Yamamoto
- Laboratory of CNS Pharmacology, Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya 467-8603, Japan
| | - Yasuhiro Maeda
- Laboratory of Hospital Pharmacy, Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya 467-8603, Japan
| | - Masahiro Ohsawa
- Laboratory of CNS Pharmacology, Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya 467-8603, Japan
| | - Hideki Ono
- Laboratory of Clinical Pharmacy and Pharmacology, Faculty of Pharmacy and Research Institute of Pharmaceutical Sciences, Musashino University, 1-1-20 Shinmachi, Nishitokyo-shi, Tokyo 202-8585, Japan.
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17
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Kishimoto Y, Cagniard B, Yamazaki M, Nakayama J, Sakimura K, Kirino Y, Kano M. Task-specific enhancement of hippocampus-dependent learning in mice deficient in monoacylglycerol lipase, the major hydrolyzing enzyme of the endocannabinoid 2-arachidonoylglycerol. Front Behav Neurosci 2015; 9:134. [PMID: 26082696 PMCID: PMC4451424 DOI: 10.3389/fnbeh.2015.00134] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Accepted: 05/11/2015] [Indexed: 12/03/2022] Open
Abstract
Growing evidence indicates that the endocannabinoid system is important for the acquisition and/or extinction of learning and memory. However, it is unclear which endocannabinoid(s) play(s) a crucial role in these cognitive functions, especially memory extinction. To elucidate the physiological role of 2-arachidonoylglycerol (2-AG), a major endocannabinoid, in behavioral and cognitive functions, we conducted a comprehensive behavioral test battery in knockout (KO) mice deficient in monoacylglycerol lipase (MGL), the major hydrolyzing enzyme of 2-AG. We found age-dependent increases in spontaneous physical activity (SPA) in MGL KO mice. Next, we tested the MGL KO mice using 5 hippocampus-dependent learning paradigms (i.e., Morris water maze (MWM), contextual fear conditioning, novel object recognition test, trace eyeblink conditioning, and water-finding test). In the MWM, MGL KO mice showed normal acquisition of reference memory, but exhibited significantly faster extinction of the learned behavior. Moreover, they showed faster memory acquisition on the reversal-learning task of the MWM. In contrast, in the contextual fear conditioning, MGL KO mice tended to show slower memory extinction. In the novel object recognition and water-finding tests, MGL KO mice exhibited enhanced memory acquisition. Trace eyeblink conditioning was not altered in MGL KO mice throughout the acquisition and extinction phases. These results indicate that 2-AG signaling is important for hippocampus-dependent learning and memory, but its contribution is highly task-dependent.
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Affiliation(s)
- Yasushi Kishimoto
- Laboratory of Neurobiophysics, Kagawa School of Pharmaceutical Sciences, Tokushima Bunri University Sanuki, Kagawa, Japan
| | - Barbara Cagniard
- Department of Neurophysiology, Graduate School of Medicine, The University of Tokyo Bunkyo-ku, Tokyo, Japan
| | - Maya Yamazaki
- Department of Cellular Neurobiology, Brain Research Institute, Niigata University Niigata, Japan
| | - Junko Nakayama
- Laboratory of Neurobiophysics, Kagawa School of Pharmaceutical Sciences, Tokushima Bunri University Sanuki, Kagawa, Japan
| | - Kenji Sakimura
- Department of Cellular Neurobiology, Brain Research Institute, Niigata University Niigata, Japan
| | - Yutaka Kirino
- Laboratory of Neurobiophysics, Kagawa School of Pharmaceutical Sciences, Tokushima Bunri University Sanuki, Kagawa, Japan
| | - Masanobu Kano
- Department of Neurophysiology, Graduate School of Medicine, The University of Tokyo Bunkyo-ku, Tokyo, Japan
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18
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Muraki K, Hatano N, Suzuki H, Muraki Y, Iwajima Y, Maeda Y, Ono H. Oseltamivir blocks human neuronal nicotinic acetylcholine receptor-mediated currents. Basic Clin Pharmacol Toxicol 2014; 116:87-95. [PMID: 24965031 DOI: 10.1111/bcpt.12290] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Accepted: 06/12/2014] [Indexed: 11/30/2022]
Abstract
The effects of oseltamivir, a neuraminidase inhibitor, were tested on the function of neuronal nicotinic acetylcholine receptors (nAChRs) in a neuroblastoma cell line IMR32 derived from human peripheral neurons and on recombinant human α3β4 nAChRs expressed in HEK cells. IMR32 cells predominately express α3β4 nAChRs. Nicotine (nic, 30 μm)-evoked currents recorded at -90 mV in IMR32 cells using the whole-cell patch clamp technique were reversibly blocked by oseltamivir in a concentration-dependent manner. In contrast, an active metabolite of oseltamivir, oseltamivir carboxylate (OC) at 30 μm had little effect on the nic-evoked currents. Oseltamivir also blocked nic-evoked currents derived from HEK cells with recombinant α3β4 nAChRs. This blockade was voltage-dependent with 10, 30 and 100 μm oseltamivir inhibiting ~50% at -100, -60 and -40 mV, respectively. Non-inactivating currents in IMR32 cells and in HEK cells with α3β4 nAChRs, which were evoked by an endogenous nicotinic agonist, ACh (5 μm), were reversibly blocked by oseltamivir. These data demonstrate that oseltamivir blocks nAChRs, presumably via binding to a site in the channel pore.
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Affiliation(s)
- Katsuhiko Muraki
- Laboratory of Cellular Pharmacology, School of Pharmacy, Aichi-Gakuin University, Chikusa, Japan
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19
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Hatakeyama D, Shoji M, Yamayoshi S, Hirota T, Nagae M, Yanagisawa S, Nakano M, Ohmi N, Noda T, Kawaoka Y, Kuzuhara T. A novel functional site in the PB2 subunit of influenza A virus essential for acetyl-CoA interaction, RNA polymerase activity, and viral replication. J Biol Chem 2014; 289:24980-94. [PMID: 25063805 PMCID: PMC4155666 DOI: 10.1074/jbc.m114.559708] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The PA, PB1, and PB2 subunits, components of the RNA-dependent RNA polymerase of influenza A virus, are essential for viral transcription and replication. The PB2 subunit binds to the host RNA cap (7-methylguanosine triphosphate (m(7)GTP)) and supports the endonuclease activity of PA to "snatch" the cap from host pre-mRNAs. However, the structure of PB2 is not fully understood, and the functional sites remain unknown. In this study, we describe a novel Val/Arg/Gly (VRG) site in the PB2 cap-binding domain, which is involved in interaction with acetyl-CoA found in eukaryotic histone acetyltransferases (HATs). In vitro experiments revealed that the recombinant PB2 cap-binding domain that includes the VRG site interacts with acetyl-CoA; moreover, it was found that this interaction could be blocked by CoA and various HAT inhibitors. Interestingly, m(7)GTP also inhibited this interaction, suggesting that the same active pocket is capable of interacting with acetyl-CoA and m(7)GTP. To elucidate the importance of the VRG site on PB2 function and viral replication, we constructed a PB2 recombinant protein and recombinant viruses including several patterns of amino acid mutations in the VRG site. Substitutions of the valine and arginine residues or of all 3 residues of the VRG site to alanine significantly reduced the binding ability of PB2 to acetyl-CoA and its RNA polymerase activity. Recombinant viruses containing the same mutations could not be replicated in cultured cells. These results indicate that the PB2 VRG sequence is a functional site that is essential for acetyl-CoA interaction, RNA polymerase activity, and viral replication.
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Affiliation(s)
- Dai Hatakeyama
- From the Laboratory of Biochemistry, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Tokushima 770-8514, Japan
| | - Masaki Shoji
- From the Laboratory of Biochemistry, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Tokushima 770-8514, Japan
| | - Seiya Yamayoshi
- the Department of Microbiology and Immunology, Division of Virology, Institute of Medical Science, and
| | - Takenori Hirota
- From the Laboratory of Biochemistry, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Tokushima 770-8514, Japan
| | - Monami Nagae
- From the Laboratory of Biochemistry, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Tokushima 770-8514, Japan
| | - Shin Yanagisawa
- From the Laboratory of Biochemistry, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Tokushima 770-8514, Japan
| | - Masahiro Nakano
- the Department of Microbiology and Immunology, Division of Virology, Institute of Medical Science, and PRESTO, Japan Science and Technology Agency, Saitama 332-0012, Japan, and
| | - Naho Ohmi
- From the Laboratory of Biochemistry, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Tokushima 770-8514, Japan
| | - Takeshi Noda
- the Department of Microbiology and Immunology, Division of Virology, Institute of Medical Science, and PRESTO, Japan Science and Technology Agency, Saitama 332-0012, Japan, and
| | - Yoshihiro Kawaoka
- the Department of Microbiology and Immunology, Division of Virology, Institute of Medical Science, and the Department of Special Pathogens, International Research Center for Infectious Diseases, Institute of Medical Science, University of Tokyo, Tokyo 108-8639, Japan, the Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin-Madison, Madison, Wisconsin 53711
| | - Takashi Kuzuhara
- From the Laboratory of Biochemistry, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Tokushima 770-8514, Japan,
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