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  1. Article ; Online: Correction: Radiation dosimetry and pharmacokinetics of the tau PET tracer florzolotau (18F) in healthy Japanese subjects.

    Miyamoto, Masaomi / Okuyama, Chio / Kagawa, Shinya / Kusano, Kuninori / Takahashi, Masaaki / Takahata, Keisuke / Jang, Ming-Kuei / Yamauchi, Hiroshi

    Annals of nuclear medicine

    2024  Volume 38, Issue 4, Page(s) 328

    Language English
    Publishing date 2024-03-07
    Publishing country Japan
    Document type Published Erratum
    ZDB-ID 1146984-5
    ISSN 1864-6433 ; 0914-7187
    ISSN (online) 1864-6433
    ISSN 0914-7187
    DOI 10.1007/s12149-024-01917-5
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  2. Article ; Online: Radiation dosimetry and pharmacokinetics of the tau PET tracer florzolotau (18F) in healthy Japanese subjects.

    Miyamoto, Masaomi / Okuyama, Chio / Kagawa, Shinya / Kusano, Kuninori / Takahashi, Masaaki / Takahata, Keisuke / Jang, Ming-Kuei / Yamauchi, Hiroshi

    Annals of nuclear medicine

    2023  Volume 37, Issue 5, Page(s) 300–309

    Abstract: Objective: Abnormal aggregation of tau in the brain is a major contributing factor in various neurodegenerative diseases. Florzolotau (18F) (florzolotau, APN-1607, PM-PBB3) has been shown to be a probe for tau fibrils in an animal model and patients ... ...

    Abstract Objective: Abnormal aggregation of tau in the brain is a major contributing factor in various neurodegenerative diseases. Florzolotau (18F) (florzolotau, APN-1607, PM-PBB3) has been shown to be a probe for tau fibrils in an animal model and patients with Alzheimer's disease and those with non-Alzheimer's disease tauopathies. The objective of this study is to evaluate the safety, pharmacokinetics, and radiation dose following a single intravenous administration of florzolotau in healthy Japanese subjects.
    Methods: Three healthy male Japanese subjects aged between 20 and 64 were enrolled in this study. Subjects were determined to be eligible based on the screening assessments at the study site. Subjects received a single intravenous dose of 195.0 ± 0.5 MBq of florzolotau and underwent the whole-body PET scan 10 times in total to calculate absorbed doses to major organs/tissues and effective dose. Radioactivities in whole blood and urine were also measured for pharmacokinetic evaluation. Absorbed doses to major organs/tissues and effective dose were estimated using the medical internal radiation dose (MIRD) method. Vital signs, electrocardiography (ECG), and blood tests were done for safety evaluation.
    Results: The intravenous injection of florzolotau was well tolerated. There were no adverse events or clinically detectable pharmacologic effects related to the tracer in any subjects. No significant changes in vital signs and ECG were observed. The highest mean initial uptake at 15 min after injection was in the liver (29.0 ± 4.0%ID), intestine (4.69 ± 1.65%ID), and brain (2.13 ± 0.18%ID). The highest absorbed dose was 508 μGy/MBq of the gallbladder wall, followed by the liver of 79.4 μGy/MBq, the pancreas of 42.5 μGy/MBq, and the upper large intestine of 34.2 μGy/MBq. The effective dose was calculated as 19.7 μSv/MBq according to the tissue weighting factor reported by ICRP-103.
    Conclusion: Florzolotau intravenous injection was well tolerated in healthy male Japanese subjects. The effective dose was determined as 3.61 mSv when 185 MBq florzolotau was given.
    MeSH term(s) Humans ; Male ; East Asian People ; Positron-Emission Tomography/methods ; Radiometry ; Radiopharmaceuticals/pharmacokinetics ; Tissue Distribution ; Young Adult ; Adult ; Middle Aged
    Chemical Substances Radiopharmaceuticals
    Language English
    Publishing date 2023-03-09
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 1146984-5
    ISSN 1864-6433 ; 0914-7187
    ISSN (online) 1864-6433
    ISSN 0914-7187
    DOI 10.1007/s12149-023-01828-x
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  3. Article: [A novel therapeutic drug: ramelteon].

    Miyamoto, Masaomi

    Nihon rinsho. Japanese journal of clinical medicine

    2009  Volume 67, Issue 8, Page(s) 1595–1600

    Abstract: Current treatment of insomnia with hypnotics, GABA(A) receptor modulators, induces various side effects, including cognitive impairment, motor disturbance, dependence, tolerance, hang-over, and rebound insomnia. Ramelteon (Rozerem) is an orally active, ... ...

    Abstract Current treatment of insomnia with hypnotics, GABA(A) receptor modulators, induces various side effects, including cognitive impairment, motor disturbance, dependence, tolerance, hang-over, and rebound insomnia. Ramelteon (Rozerem) is an orally active, highly selective melatonin MT1/MT2 receptor agonist. Unlike the sedative hypnotics that target GABA(A) receptor complexes, ramelteon is a chronohypnotic that acts on the melatonin MT1 and MT2 receptors, which are primarily located in the suprachiasmatic nucleus. Ramelteon has demonstrated sleep-promoting effects in clinical trials, and coupled with its favorable safety profile and lack of abuse potential or dependence, this chronohypnotic provides an important treatment option for insomnia.
    MeSH term(s) Humans ; Indenes/therapeutic use ; Receptor, Melatonin, MT1/agonists ; Receptor, Melatonin, MT2/agonists ; Sleep Initiation and Maintenance Disorders/drug therapy
    Chemical Substances Indenes ; Receptor, Melatonin, MT1 ; Receptor, Melatonin, MT2 ; ramelteon (901AS54I69)
    Language Japanese
    Publishing date 2009-08
    Publishing country Japan
    Document type English Abstract ; Journal Article ; Review
    ZDB-ID 390903-7
    ISSN 0047-1852
    ISSN 0047-1852
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  4. Article ; Online: Pharmacology of ramelteon, a selective MT1/MT2 receptor agonist: a novel therapeutic drug for sleep disorders.

    Miyamoto, Masaomi

    CNS neuroscience & therapeutics

    2009  Volume 15, Issue 1, Page(s) 32–51

    Abstract: An estimated one-third of the general population is affected by insomnia, and this number is increasing due to more stressful working conditions and the progressive aging of society. However, current treatment of insomnia with hypnotics, gamma- ... ...

    Abstract An estimated one-third of the general population is affected by insomnia, and this number is increasing due to more stressful working conditions and the progressive aging of society. However, current treatment of insomnia with hypnotics, gamma-aminobutyric acid A (GABA(A)) receptor modulators, induces various side effects, including cognitive impairment, motor disturbance, dependence, tolerance, hangover, and rebound insomnia. Ramelteon (Rozerem; Takeda Pharmaceutical Company Limited, Osaka, Japan) is an orally active, highly selective melatonin MT(1)/MT(2) receptor agonist. Unlike the sedative hypnotics that target GABA(A) receptor complexes, ramelteon is a chronohypnotic that acts on the melatonin MT(1) and MT(2) receptors, which are primarily located in the suprachiasmatic nucleus, the body's "master clock." As such, ramelteon possesses the first new therapeutic mechanism of action for a prescription insomnia medication in over three decades. Ramelteon has demonstrated sleep-promoting effects in clinical trials, and coupled with its favorable safety profile and lack of abuse potential or dependence, this chronohypnotic provides an important treatment option for insomnia.
    MeSH term(s) Animals ; Circadian Rhythm/drug effects ; Electroencephalography/drug effects ; Humans ; Indenes/adverse effects ; Indenes/metabolism ; Indenes/pharmacology ; Indenes/therapeutic use ; Learning/drug effects ; Memory/drug effects ; Receptor, Melatonin, MT1/agonists ; Receptor, Melatonin, MT2/agonists ; Reward ; Sleep Wake Disorders/drug therapy ; Substance-Related Disorders/etiology
    Chemical Substances Indenes ; Receptor, Melatonin, MT1 ; Receptor, Melatonin, MT2 ; ramelteon (901AS54I69)
    Language English
    Publishing date 2009-03-04
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 2423461-8
    ISSN 1755-5949 ; 1755-5930
    ISSN (online) 1755-5949
    ISSN 1755-5930
    DOI 10.1111/j.1755-5949.2008.00066.x
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  5. Article: [Drugs for insomnia and improving quality of life (QOL): research and development of ramelteon, an MT1/MT2-receptor agonist].

    Miyamoto, Masaomi

    Nihon yakurigaku zasshi. Folia pharmacologica Japonica

    2007  Volume 131, Issue 1, Page(s) 16–21

    MeSH term(s) Animals ; Humans ; Indenes/pharmacology ; Melatonin/physiology ; Quality of Life ; Receptors, Melatonin/drug effects ; Sleep Initiation and Maintenance Disorders/drug therapy
    Chemical Substances Indenes ; Receptors, Melatonin ; ramelteon (901AS54I69) ; Melatonin (JL5DK93RCL)
    Language Japanese
    Publishing date 2007-11-06
    Publishing country Japan
    Document type Journal Article ; Review
    ZDB-ID 1097532-9
    ISSN 1347-8397 ; 0015-5691
    ISSN (online) 1347-8397
    ISSN 0015-5691
    DOI 10.1254/fpj.131.16
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  6. Article: Effect of ramelteon (TAK-375), a selective MT1/MT2 receptor agonist, on motor performance in mice.

    Miyamoto, Masaomi

    Neuroscience letters

    2006  Volume 402, Issue 3, Page(s) 201–204

    Abstract: Effect of (S)-N-[2-(1,6,7,8-tetrahydro-2H-indeno-[5,4-b]furan-8-yl)ethyl]propionamide (ramelteon, TAK-375), a selective MT1/MT2 receptor agonist, on motor coordination was studied using rota-rod performance in mice. Ramelteon did not impair rota-rod ... ...

    Abstract Effect of (S)-N-[2-(1,6,7,8-tetrahydro-2H-indeno-[5,4-b]furan-8-yl)ethyl]propionamide (ramelteon, TAK-375), a selective MT1/MT2 receptor agonist, on motor coordination was studied using rota-rod performance in mice. Ramelteon did not impair rota-rod performance at doses of 3, 10 and 30 mg/kg, p.o. Melatonin and N-acetyl-5-hydroxytryptamine (N-acetyl-5-HT), a ligand of MT3 biding site, also had no impairment on the performance, per se. However, in combination with a low dose of diazepam (3mg/kg, p.o.), treatment with melatonin and N-acetyl-5-HT exacerbated the impairment by diazepam. Ramelteon had no significant effect on the diazepam-induced impairment of motor coordination.
    MeSH term(s) Animals ; Indenes/pharmacology ; Male ; Mice ; Mice, Inbred ICR ; Motor Activity/drug effects ; Receptor, Melatonin, MT1/agonists ; Receptor, Melatonin, MT2/agonists
    Chemical Substances Indenes ; Receptor, Melatonin, MT1 ; Receptor, Melatonin, MT2 ; ramelteon (901AS54I69)
    Language English
    Publishing date 2006-05-24
    Publishing country Ireland
    Document type Journal Article
    ZDB-ID 194929-9
    ISSN 1872-7972 ; 0304-3940
    ISSN (online) 1872-7972
    ISSN 0304-3940
    DOI 10.1016/j.neulet.2006.02.049
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  7. Article: [Recent and potential drugs for treatment of insomnia].

    Terao, Akira / Miyamoto, Masaomi

    Nihon yakurigaku zasshi. Folia pharmacologica Japonica

    2007  Volume 129, Issue 1, Page(s) 35–41

    MeSH term(s) Animals ; Azabicyclo Compounds ; Benzodiazepines ; Diphenhydramine ; Drug Design ; Fluorobenzenes ; GABA-A Receptor Agonists ; Histamine H1 Antagonists ; Humans ; Hypnotics and Sedatives ; Indenes ; Orexin Receptors ; Phenols ; Piperazines ; Pyridines ; Receptor, Melatonin, MT1/agonists ; Receptor, Melatonin, MT2/agonists ; Receptors, G-Protein-Coupled/antagonists & inhibitors ; Receptors, Neuropeptide/antagonists & inhibitors ; Serotonin 5-HT2 Receptor Antagonists ; Sleep Initiation and Maintenance Disorders/drug therapy ; Sleep Initiation and Maintenance Disorders/etiology ; Thiophenes ; Zolpidem
    Chemical Substances Azabicyclo Compounds ; Fluorobenzenes ; GABA-A Receptor Agonists ; Histamine H1 Antagonists ; Hypnotics and Sedatives ; Indenes ; Orexin Receptors ; Phenols ; Piperazines ; Pyridines ; Receptor, Melatonin, MT1 ; Receptor, Melatonin, MT2 ; Receptors, G-Protein-Coupled ; Receptors, Neuropeptide ; Serotonin 5-HT2 Receptor Antagonists ; Thiophenes ; zopiclone (03A5ORL08Q) ; Benzodiazepines (12794-10-4) ; SR 46349B (130580-02-8) ; Zolpidem (7K383OQI23) ; indiplon (8BT63DA42E) ; Diphenhydramine (8GTS82S83M) ; ramelteon (901AS54I69)
    Language Japanese
    Publishing date 2007-01-01
    Publishing country Japan
    Document type Journal Article ; Review
    ZDB-ID 1097532-9
    ISSN 1347-8397 ; 0015-5691
    ISSN (online) 1347-8397
    ISSN 0015-5691
    DOI 10.1254/fpj.129.35
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  8. Article ; Online: Pharmacological characterization of M-II, the major human metabolite of ramelteon.

    Nishiyama, Keiji / Nishikawa, Hisao / Kato, Koki / Miyamoto, Masaomi / Tsukamoto, Tetsuya / Hirai, Keisuke

    Pharmacology

    2014  Volume 93, Issue 3-4, Page(s) 197–201

    Abstract: The duration of action of melatonin may be important for improvements in sleep efficiency in insomniacs. Ramelteon, a selective melatonin agonist, is primarily metabolized to the active metabolite M-II, which has a longer half-life and greater systemic ... ...

    Abstract The duration of action of melatonin may be important for improvements in sleep efficiency in insomniacs. Ramelteon, a selective melatonin agonist, is primarily metabolized to the active metabolite M-II, which has a longer half-life and greater systemic exposure than ramelteon. Hence, M-II may contribute significantly to the hypnotic benefits of ramelteon. We assessed the ramelteon-like activity of M-II in vitro and in vivo using cats. Binding and functional studies in Chinese hamster ovary cells expressing human melatonin receptors (MT1 or MT2) revealed that M-II binds melatonin receptors with lower affinity (Ki: 114 and 566 pmol/l for MT1 and MT2, respectively) and has lower potency (IC50: 208 and 1,470 pmol/l for MT1 and MT2, respectively) compared with ramelteon. However, higher M-II doses significantly improved sleep in cats. Thus, M-II may contribute to the clinical efficacy of ramelteon.
    MeSH term(s) Animals ; CHO Cells ; Cats ; Cricetinae ; Cricetulus ; Dose-Response Relationship, Drug ; Female ; Half-Life ; Humans ; Hypnotics and Sedatives/administration & dosage ; Hypnotics and Sedatives/pharmacology ; Indenes/administration & dosage ; Indenes/metabolism ; Indenes/pharmacology ; Inhibitory Concentration 50 ; Male ; Receptor, Melatonin, MT1/agonists ; Receptor, Melatonin, MT1/metabolism ; Receptor, Melatonin, MT2/agonists ; Receptor, Melatonin, MT2/metabolism ; Sleep/drug effects
    Chemical Substances Hypnotics and Sedatives ; Indenes ; Receptor, Melatonin, MT1 ; Receptor, Melatonin, MT2 ; ramelteon (901AS54I69)
    Language English
    Publishing date 2014
    Publishing country Switzerland
    Document type Comparative Study ; Journal Article
    ZDB-ID 206671-3
    ISSN 1423-0313 ; 0031-7012
    ISSN (online) 1423-0313
    ISSN 0031-7012
    DOI 10.1159/000362459
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  9. Article: [Preclinical pharmacological profiles and clinical outcome of the novel melatonin-receptor agonist ramelteon (Rozerem 8 mg).].

    Hirai, Keisuke / Kato, Koki / Nishikawa, Hisao / Yukuhiro, Nobuhito / Nishiyama, Keiji / Miyamoto, Masaomi

    Nihon yakurigaku zasshi. Folia pharmacologica Japonica

    2010  Volume 136, Issue 1, Page(s) 51–60

    MeSH term(s) Animals ; Chronic Disease ; Cyclic AMP/metabolism ; Drug Evaluation, Preclinical ; Humans ; Indenes/administration & dosage ; Indenes/adverse effects ; Indenes/pharmacology ; Randomized Controlled Trials as Topic ; Receptors, Melatonin/agonists ; Sleep Initiation and Maintenance Disorders/drug therapy ; Sleep Stages/drug effects ; Substance-Related Disorders ; Suprachiasmatic Nucleus/drug effects ; Suprachiasmatic Nucleus/physiology
    Chemical Substances Indenes ; Receptors, Melatonin ; ramelteon (901AS54I69) ; Cyclic AMP (E0399OZS9N)
    Language Japanese
    Publishing date 2010-07-08
    Publishing country Japan
    Document type Journal Article ; Review
    ZDB-ID 1097532-9
    ISSN 1347-8397 ; 0015-5691
    ISSN (online) 1347-8397
    ISSN 0015-5691
    DOI 10.1254/fpj.136.51
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  10. Article ; Online: Ameliorative effects of a non-competitive BACE1 inhibitor TAK-070 on Aβ peptide levels and impaired learning behavior in aged rats.

    Takahashi, Hideki / Fukumoto, Hiroaki / Maeda, Ryouta / Terauchi, Jun / Kato, Kaneyoshi / Miyamoto, Masaomi

    Brain research

    2010  Volume 1361, Page(s) 146–156

    Abstract: We examined the effects of TAK-070, a novel non-competitive β-secretase (BACE1) inhibitor, on the levels of Aβ peptides and behavioral deficits in rats. TAK-070 reduced soluble Aβ40 and Aβ42 levels of the cerebral cortex in a time- and dose-dependent ... ...

    Abstract We examined the effects of TAK-070, a novel non-competitive β-secretase (BACE1) inhibitor, on the levels of Aβ peptides and behavioral deficits in rats. TAK-070 reduced soluble Aβ40 and Aβ42 levels of the cerebral cortex in a time- and dose-dependent manner in young rats. We found that the insoluble Aβ42 content increased significantly with aging from 22 months old without changing Aβ40 content. TAK-070 normalized the Aβ42 levels to those in young rats when they were fed chow containing TAK-070 starting at 19 months old for 6.5 months. Repeated administration of TAK-070 to aged rats for 2 weeks ameliorated the impaired spatial learning in the Morris water maze task and reduced the levels of soluble and insoluble Aβ peptides at doses of 0.3-1mg/kg, (p.o.). Interestingly, TAK-070 significantly recovered the reduced brain synaptophysin levels in aged rats to those in young rats. Our findings support the idea that partial inhibition of BACE1 by TAK-070 exerts symptomatic as well as disease-modifying effects for the treatment of Alzheimer's disease.
    MeSH term(s) Administration, Oral ; Aging/drug effects ; Aging/metabolism ; Aging/psychology ; Amyloid Precursor Protein Secretases/antagonists & inhibitors ; Amyloid beta-Peptides/metabolism ; Animals ; Biphenyl Compounds/administration & dosage ; Biphenyl Compounds/pharmacology ; Brain/drug effects ; Brain/metabolism ; Cerebral Cortex/drug effects ; Cerebral Cortex/metabolism ; Dose-Response Relationship, Drug ; Enzyme-Linked Immunosorbent Assay ; Male ; Maze Learning/drug effects ; Naphthalenes/administration & dosage ; Naphthalenes/pharmacology ; Neuropsychological Tests ; Peptide Fragments/metabolism ; Rats ; Rats, Inbred F344 ; Rats, Wistar ; Spatial Behavior/drug effects ; Swimming ; Synaptophysin/metabolism ; Treatment Outcome
    Chemical Substances Amyloid beta-Peptides ; Biphenyl Compounds ; Naphthalenes ; Peptide Fragments ; Synaptophysin ; TAK-070 ; amyloid beta-protein (1-40) ; amyloid beta-protein (1-42) ; Amyloid Precursor Protein Secretases (EC 3.4.-)
    Language English
    Publishing date 2010-11-18
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 1200-2
    ISSN 1872-6240 ; 0006-8993
    ISSN (online) 1872-6240
    ISSN 0006-8993
    DOI 10.1016/j.brainres.2010.09.032
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