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Takeuchi K, Togashi Y, Kamihara Y, Fukuyama T, Yoshioka H, Inoue A, Katsuki H, Kiura K, Nakagawa K, Seto T, Maemondo M, Hida T, Harada M, Ohe Y, Nogami N, Yamamoto N, Nishio M, Tamura T. Prospective and clinical validation of ALK immunohistochemistry: results from the phase I/II study of alectinib for ALK-positive lung cancer (AF-001JP study). Ann Oncol 2015; 27:185-92. [PMID: 26487585 PMCID: PMC4684157 DOI: 10.1093/annonc/mdv501] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Accepted: 10/08/2015] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Anaplastic lymphoma kinase (ALK) fusions need to be accurately and efficiently detected for ALK inhibitor therapy. Fluorescence in situ hybridization (FISH) remains the reference test. Although increasing data are supporting that ALK immunohistochemistry (IHC) is highly concordant with FISH, IHC screening needed to be clinically and prospectively validated. PATIENTS AND METHODS In the AF-001JP trial for alectinib, 436 patients were screened for ALK fusions through IHC (n = 384) confirmed with FISH (n = 181), multiplex RT-PCR (n = 68), or both (n = 16). IHC results were scored with iScore. RESULT ALK fusion was positive in 137 patients and negative in 250 patients. Since the presence of cancer cells in the samples for RT-PCR was not confirmed, ALK fusion negativity could not be ascertained in 49 patients. IHC interpreted with iScore showed a 99.4% (173/174) concordance with FISH. All 41 patients who had iScore 3 and were enrolled in phase II showed at least 30% tumor reduction with 92.7% overall response rate. Two IHC-positive patients with an atypical FISH pattern responded to ALK inhibitor therapy. The reduction rate was not correlated with IHC staining intensity. CONCLUSIONS Our study showed (i) that when sufficiently sensitive and appropriately interpreted, IHC can be a stand-alone diagnostic for ALK inhibitor therapies; (ii) that when atypical FISH patterns are accompanied by IHC positivity, the patients should be considered as candidates for ALK inhibitor therapies, and (iii) that the expression level of ALK fusion is not related to the level of response to ALK inhibitors and is thus not required for patient selection. REGISTRATION NUMBER JapicCTI-101264 (This study is registered with the Japan Pharmaceutical Information Center).
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Takamochi K, Suehara Y, Mogushi K, Kohsaka S, Mano H, Takeuchi K, Saito T, Suzuki K, Ladanyi M, Takahashi K, Takahashi F. 3014 Comprehensive analyses of oncogenic driver fusions using the NanoString nCounter in lung adenocarcinoma from Japanese never- and light-smokers. Eur J Cancer 2015. [DOI: 10.1016/s0959-8049(16)31658-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Nishimura N, Terui Y, Inoue N, Takahashi A, Tsuyama N, Gunji M, Nitta H, Ueda K, Mishima Y, Yokoyama M, Takeuchi K, Terui Y, Hatake K. Multiple myeloma as a second primary malignancy; one fourth of patients had prior history of other malignances. CLINICAL LYMPHOMA MYELOMA & LEUKEMIA 2015. [DOI: 10.1016/j.clml.2015.07.292] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Takeuchi K, Homan Y, Fukumoto Y, Kuroki Y, Tokudome M, Setoyama H, Awata S, Takeuchi M. Evaluation of the usefulness of refrozen-thawed embryo transfer (R-FET). Fertil Steril 2015. [DOI: 10.1016/j.fertnstert.2015.07.590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Takeuchi K, Takayama S, Izuhara C. Comparative Effects of The Anti-Platelet Drugs, Clopidogrel, Ticropidine, and Cilostazol, On Aspirin- Induced Gastric Bleeding and Damage In Rats. Clin Ther 2015. [DOI: 10.1016/j.clinthera.2015.05.082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Takeuchi K, Kita K, Takahashi K, Aihara E, Hayashi S. Muscarinic acetylcholine receptor subtype 4 is essential for cholinergic stimulation of duodenal bicarbonate secretion in mice - relationship to D cell/somatostatin. JOURNAL OF PHYSIOLOGY AND PHARMACOLOGY : AN OFFICIAL JOURNAL OF THE POLISH PHYSIOLOGICAL SOCIETY 2015; 66:391-401. [PMID: 26084221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 12/26/2014] [Accepted: 02/18/2015] [Indexed: 06/04/2023]
Abstract
We investigated the roles of muscarinic (M) acetylcholine receptor subtype in the cholinergic stimulation of duodenal HCO3(-) secretion using knockout (KO) mice. Wild-type and M1-M5 KO C57BL/6J mice were used. The duodenal mucosa was mounted on an Ussing chamber, and HCO3(-) secretion was measured at pH 7.0 using a pH-stat method in vitro. Carbachol (CCh) or other agents were added to the serosal side. CCh dose-dependently stimulated HCO3(-) secretion in wild-type mice, and this effect was completely inhibited in the presence of atropine. The HCO3(-) response to CCh in wild-type mice was also inhibited by pirenzepine (M1 antagonist), 4DAMP (M3 antagonist), and tropicamide (M4 antagonist), but not by methoctramine (M2 antagonist). CCh stimulated HCO3(-) secretion in M2 and M5 KO animals as effectively as in WT mice; however, this stimulatory effect was significantly attenuated in M1, M3, and M4 KO mice. The decrease observed in the CCh-stimulated HCO3(-) response in M4 KO mice was reversed by the co-application of CYN154806, a somatostatin receptor type 2 (SST2) antagonist. Octreotide (a somatostatin analogue) decreased the basal and CCh-stimulated secretion of HCO3(-) in wild-type mice. The co-localized expression of somatostatin and M4 receptors was confirmed immunohistologically in the duodenum. We concluded that the duodenal HCO3(-) response to CCh was directly mediated by M1/M3 receptors and indirectly modified by M4 receptors. The activation of M4 receptors was assumed to inhibit the release of somatostatin from D cells and potentiate the HCO3(-) response by removing the negative influence of somatostatin via the activation of SST2 receptors.
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Kataoka K, Matsumoto H, Kaneko H, Notomi S, Takeuchi K, Sweigard JH, Atik A, Murakami Y, Connor KM, Terasaki H, Miller JW, Vavvas DG. Macrophage- and RIP3-dependent inflammasome activation exacerbates retinal detachment-induced photoreceptor cell death. Cell Death Dis 2015; 6:e1731. [PMID: 25906154 PMCID: PMC4650542 DOI: 10.1038/cddis.2015.73] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Revised: 12/24/2014] [Accepted: 02/16/2015] [Indexed: 12/21/2022]
Abstract
Detachment of photoreceptors from the retinal pigment epithelium is seen in various retinal disorders, resulting in photoreceptor death and subsequent vision loss. Cell death results in the release of endogenous molecules that activate molecular platforms containing caspase-1, termed inflammasomes. Inflammasome activation in retinal diseases has been reported in some cases to be protective and in others to be detrimental, causing neuronal cell death. Moreover, the cellular source of inflammasomes in retinal disorders is not clear. Here, we demonstrate that patients with photoreceptor injury by retinal detachment (RD) have increased levels of cleaved IL-1β, an end product of inflammasome activation. In an animal model of RD, photoreceptor cell death led to activation of endogenous inflammasomes, and this activation was diminished by Rip3 deletion. The major source of Il1b expression was found to be infiltrating macrophages in the subretinal space, rather than dying photoreceptors. Inflammasome inhibition attenuated photoreceptor death after RD. Our data implicate the infiltrating macrophages as a source of damaging inflammasomes after photoreceptor detachment in a RIP3-dependent manner and suggest a novel therapeutic target for treatment of retinal diseases.
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Tamura T, Seto T, Nakagawa K, Maemondo M, Inoue A, Hida T, Yoshioka H, Harada M, Ohe Y, Nogami N, Murakami H, Takeuchi K, Asakawa T, Kikuchi K, Tanaka T, Nishio M. Updated Data of a Phase 1/2 Study (AF-001JP) of Alectinib, a CNS-Penetrant, Highly Selective ALK Inhibitor in ALK-rearranged Advanced NSCLC. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.08.031] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Kashima S, Inoue K, Matsumoto M, Takeuchi K. Non-physician communities in Japan: are they still disadvantaged? Rural Remote Health 2014; 14:2907. [PMID: 25270075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023] Open
Abstract
INTRODUCTION Non-physician community' (NPC) is a policy term that indicates a medically underserved area in Japan. Designated NPCs are politically targeted as the foci of medical resource allocation. NPC is defined as a specified district where 50 or more persons dwell within a geographic diameter of 4 km and medical care is not easily accessible. The definition of NPC was first introduced in 1960 and has been unchanged for more than half a century despite radical social changes in rural Japan. This study examines whether designated NPCs are still more disadvantaged in terms of geographical access to healthcare in comparison to other communities. METHODS Hiroshima prefecture, which has the largest number of NPCs in terms of tertiary healthcare areas of Japan, was used as the study area. Targeted communities were all the NPCs in the prefecture, and, as controls, two community groups were selected: non-NPC adjacent to NPC, and municipal center. We measured driving time from NPCs and control communities to the nearest healthcare facilities, which were classified into the following two types: primary or secondary care facilities (n=2636) and tertiary care facilities (equal to tertiary emergency care centers; n=6). We further calculated the driving time to the nearest facilities for secondary emergency care (n=246) extracted from the 2636 primary or secondary care facilities. RESULTS The median driving times to the nearest primary or secondary healthcare facility for NPC, non-NPC, and municipal center were 11 minutes, 11 minutes, and 1 minute, respectively; the times to a tertiary healthcare facility (equal to an accident and emergency care center) were 80 minutes, 84 minutes, and 68 minutes, respectively; and the times to a secondary emergency care facility were 24 minutes, 18 minutes, and 15 minutes, respectively. Although a municipal center was significantly more advantageous in driving time compared to a primary or secondary care facility, the disadvantage of a NPC in access was no more obvious than an adjacent non-NPC for any type of healthcare facility. CONCLUSIONS NPCs had a disadvantage in access time to primary, secondary and tertiary medical care compared with a municipal center. NPCs, however, did not have a greater access disadvantage in comparison to adjacent rural communities for any type of medical facility. As such, future resource allocation policies in Japan need to redefine medically underserved communities.
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Hatade T, Takeuchi K, Fujita N, Arakawa T, Miki A. Effect of heat stress soon after muscle injury on the expression of MyoD and myogenin during regeneration process. JOURNAL OF MUSCULOSKELETAL & NEURONAL INTERACTIONS 2014; 14:325-333. [PMID: 25198228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Heat stress could promote skeletal muscle regeneration. But, in the regeneration process, effects of heat stress on myogenic cells and the regulating factors is unknown. Therefore, Influences of heat stress soon after injury on distribution of the myogenic cells and chronological changes in expression of MyoD and myogenin were examined. The first peak of MyoD expression was temporally correlated with the time when proliferating satellite cells began to appear, and the rapid decline of the MyoD expression from the first peak, with the appearance time of myoblasts, respectively in both the non-Heat and Heat groups. The first peak of myogenin expression was temporally correlated with the time when multinuclear cells began to form in the both groups. Due to the heat stress, proliferation and differentiation of myogenic cells and chronological changes in these factors were accelerated one day earlier than in the non-Heat group. As MyoD and myogenin are regulating factor of proliferation and differentiation, heat stress soon after the muscle injury could accelerate the proliferation and differentiation of myogenic cells and the expression of their regulating factors MyoD and myogenin.
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Harada A, Oguchi M, Hatake K, Terui Y, Yokoyama M, Takeuchi K, Igarashi M. Primary Radiation Therapy for Localized Duodenal Follicular Lymphoma. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.1994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Ito R, Tsujihata Y, Matsuda-Nagasumi K, Mori I, Negoro N, Takeuchi K. TAK-875, a GPR40/FFAR1 agonist, in combination with metformin prevents progression of diabetes and β-cell dysfunction in Zucker diabetic fatty rats. Br J Pharmacol 2014; 170:568-80. [PMID: 23848179 DOI: 10.1111/bph.12297] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Revised: 06/20/2013] [Accepted: 07/03/2013] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND AND PURPOSE TAK-875, a selective GPCR40/free fatty acid receptor 1 agonist, improves glycaemic control by increasing glucose-dependent insulin secretion. Metformin is a first-line drug for treatment of type 2 diabetes that improves peripheral insulin resistance. Based on complementary mechanism of action, combining these agents is expected to enhance glycaemic control. Here, we evaluated the chronic effects of TAK-875 monotherapy and combination therapy with metformin in diabetic rats. EXPERIMENTAL APPROACH Long-term effects on glycaemic control and β-cell function were evaluated using Zucker diabetic fatty (ZDF) rats, which develop diabetes with hyperlipidaemia and progressive β-cell dysfunction. KEY RESULTS Single doses of TAK-875 (3-10 mg·kg(-1) ) and metformin (50-150 mg·kg(-1) ) significantly improved both postprandial and fasting hyperglycaemia, and additive improvements were observed in their combination. Six-week treatment with TAK-875 (10 mg·kg(-1) , b.i.d.) significantly decreased glycosylated Hb (GHb) by 1.7%, and the effect was additively enhanced by combination with metformin (50 mg·kg(-1) , q.d.; GHb: -2.4%). This improvement in glycaemic control in the combination group was accompanied by significant 3.2-fold increase in fasting plasma insulin levels. Pancreatic insulin content was maintained at a level comparable to that in normal rats by combination treatment (vehicle: 26, combination: 67.1; normal lean: 69.1 ng·mg(-1) pancreas) without affecting pancreatic glucagon content. Immunohistochemical analyses revealed normal morphology, enhanced pancreas duodenum homeobox-1 expression and increased PCNA-positive cells in islets of the combination group. CONCLUSION AND IMPLICATIONS Our results indicate that combination therapy with TAK-875 and metformin could be a valuable strategy for glycaemic control and β-cell preservation in type 2 diabetes.
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Yamaguchi S, Mase T, Takeuchi K. Secretion of Mono- and Diacylglycerol Lipase fromPenicillium camembertiiU-150 bySaccharomyces cerevisiaeand Site-directed Mutagenesis of the Putative Catalytic Sites of the Lipase. Biosci Biotechnol Biochem 2014; 56:315-9. [PMID: 1368304 DOI: 10.1271/bbb.56.315] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Yeast cells carrying intronless mono- and diacylglycerol lipase (MDGL) genes, constructed by recombination of the genomic gene and cDNA, secreted MDGL into the culture supernatant. Most of the yeast MDGL were extensively glycosylated while they had a similar glyceride specificity to that of native MDGL. Site-directed mutagenesis was used to directly confirm the involvements in enzyme activity of the presumptive amino acid residues to form the catalytic center of MDGL. These residues were conserved in the primary structure alignment of a lipase family from filamentous fungi. Mutant lipase proteins in which Ser83, Ser145, or His259 was replaced with glycine were secreted by yeast transformants as inactive proteins. Mutant proteins replacing Asp199 with glycine or asparagine were not detected in the culture supernatant. Replacing other two highly conserved aspartic acids (at positions 232 and 243) with glycine did not render the enzyme inactive. These results indicate that Ser83, Ser145, and His259 in MDGL, are essential to enzyme activity. Asp199 is also likely to be involved.
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Yonemoto Y, Okamura K, Sakurai T, Ayabe K, Takeuchi K, Kaneko T, Matsushita M, Iso T, Okura C, Inoue H, Otsuka K, Takagishi K. THU0191 Comparison of Golimumab 50 Mg/4 Weeks plus Methotrexate with Golimumab 100 Mg/4 Weeks Monotherapy in Patients with Rheumatoid Arthritis: Results from the Japanese GRN Multicenter Cohort Study. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.4102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Takanami I, Takeuchi K. Favorable results of early diagnosis by cervicothoracic computed tomography scans for descending necrotizing mediastinitis. ACTA ACUST UNITED AC 2014; 49:220-3. [PMID: 11355254 DOI: 10.1007/bf02913519] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
OBJECTIVES We studied results of early diagnosis by cervicothoracic computed tomography and early aggressive surgery for descending necrotizing mediastinitis. METHODS Between 1990 and 1999, 5 patients with descending necrotizing mediastinitis were surgically treated in our institute. Computed tomography scans confirmed mediastinitis in all cases, even though chest x-ray films demonstrated a widening mediastial shadow in only 2. Soon after surgical drainage of the deep neck infection and diagnosis of descending necrotizing mediastinitis, all patients underwent surgical mediastinal drainage. Mediastinitis was drained by thoracotomy in 1, managed thoracoscopically in 1 and cervicomediastinally drained in 3. RESULTS The outcome was favorable in all patients. CONCLUSIONS Early diagnosis by cervicothoracic computed tomography and early aggressive surgery for descending necrotizing mediastinitis are essential to favorable outcome.
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Takeuchi K, Aida J, Ito K, Furuta M, Yamashita Y, Osaka K. Nutritional status and dysphagia risk among community-dwelling frail older adults. J Nutr Health Aging 2014; 18:352-7. [PMID: 24676314 DOI: 10.1007/s12603-014-0025-3] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
OBJECTIVES Although the presence of dysphagia is a key determinant of nutritional status among older adults, few studies have focused on the association between malnutrition and dysphagia risk in community-dwelling frail older adults. This study estimated the prevalence of malnutrition and quantified the association between malnutrition and dysphagia risk among community-dwelling older Japanese adults requiring long-term care. DESIGN Cross-sectional study. SETTING This study was conducted with the cooperation of the Japan Dental Association and local dental associations in all 47 prefectures from January to February 2012. PARTICIPANTS Individuals aged ≥65 years capable of oral nutrient intake who were living at home and receiving home dental care and treatment. MEASUREMENTS Individual demographic characteristics and factors associated with health loss-related functional decline were obtained through interviews by home-visit dentists and self-administered questionnaires. Nutritional status and dysphagia risk were evaluated using the Mini Nutritional Assessment Short Form and the Dysphagia Risk Assessment for the Community-dwelling Elderly. RESULTS Among 874 respondents (345 men and 529 women), 24.6% were malnourished, 67.4% were at risk of malnutrition, and 8.0% were well nourished. Dysphagia risk was related to an increased likelihood of malnutrition at an old age, even after adjusting for covariates (PR = 1.30, 95% CI = 1.01-1.67). CONCLUSION Malnutrition is highly prevalent among community-dwelling frail older adults, and dysphagia risk is independently associated with malnutrition. Dysphagia may be an important predictor of malnutrition progression in aged populations.
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Takeuchi K. Gastric cytoprotection by prostaglandin E₂ and prostacyclin: relationship to EP1 and IP receptors. JOURNAL OF PHYSIOLOGY AND PHARMACOLOGY : AN OFFICIAL JOURNAL OF THE POLISH PHYSIOLOGICAL SOCIETY 2014; 65:3-14. [PMID: 24622825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 06/20/2013] [Accepted: 01/06/2014] [Indexed: 06/03/2023]
Abstract
Endogenous prostaglandins (PGs) play a role in modulating mucosal integrity and have various functions in the stomach, with E type PGs being the most effective. PGE₂ provides gastric cytoprotection against damage induced in rats by HCl/ethanol, indomethacin, or acid back-diffusion after barrier disruption. These effects were mimicked by EP1 agonists and/or attenuated by an EP1 antagonist, and disappeared in EP1 (-/-) mice. Furthermore, the adaptive cytoprotection induced by a mild irritant was attenuated by the EP1 antagonist and indomethacin. Capsaicin also provides gastric protection against HCl/ethanol, and its action was mitigated by indomethacin and sensory deafferentation, but not by the EP1 antagonist. Similar results were obtained using mice lacking various EP receptor subtypes; i.e., PGE₂ failed to provide both direct and adaptive cytoprotection in EP1 (-/-) mice, while capsaicin-induced protection was observed in EP1 (-/-) mice, but disappeared in IP (-/-) mice. The effects of PGE₂ on various gastric functions are mediated by different EP receptor subtypes; inhibition of acid secretion (EP3) and motility (EP1), stimulation of mucus secretion (EP4) and HCO₃⁻ secretion (EP1), and an increase in mucosal blood flow (EP2/EP4). In conclusion, the presence of EP1 receptors is essential to the protective action of PGE₂, either generated endogenously or administered exogenously, against HCl/ ethanol or indomethacin, and this action is functionally associated with the inhibition of gastric motility. Endogenous PGs also contribute to maintaining mucosal integrity after barrier disruption through an increase in mucosal blood flow, which occurs via sensory neurons influenced by activation of the EP1 receptor.
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Takeuchi K, Sugiura T, Matsubara K, Sato R, Shimizu T, Masuo Y, Horikawa M, Nakamichi N, Ishiwata N, Kato Y. Interaction of novel platelet-increasing agent eltrombopag with rosuvastatin via breast cancer resistance protein in humans. Drug Metab Dispos 2014; 42:726-34. [PMID: 24440960 DOI: 10.1124/dmd.113.054767] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Eltrombopag (ELT), an orally available thrombopoietin receptor agonist, is a substrate of organic anion transporting polypeptide 1B1 (OATP1B1), and coadministration of ELT increases the plasma concentration of rosuvastatin in humans. Since the pharmacokinetic mechanism(s) of the interaction is unknown, the present study aimed to clarify the drug interaction potential of ELT at transporters. The OATP1B1-mediated uptake of ELT was inhibited by several therapeutic agents used to treat lifestyle diseases. Among them, rosuvastatin was a potent inhibitor with an IC(50) of 0.05 µM, which corresponds to one-seventh of the calculated maximum unbound rosuvastatin concentration at the inlet to the liver. Nevertheless, a simulation study using a physiologically based pharmacokinetic model predicted that the effect of rosuvastatin on the pharmacokinetic profile of ELT in vivo would be minimal. On the other hand, ELT potently inhibited uptake of rosuvastatin by OATP1B1 and human hepatocytes, with an IC(50) of 0.1 µM. However, the results of the simulation study indicated that inhibition of OATP1B1 by ELT can only partially explain the clinically observed interaction with rosuvastatin. ELT also inhibited transcellular transport of rosuvastatin in MDCKII cells stably expressing breast cancer resistance protein (BCRP), and was found to be a substrate of BCRP. The interaction of ELT with rosuvastatin can be almost quantitatively explained on the assumption that intestinal secretion of rosuvastatin is essentially completely inhibited by ELT. These results suggest that BCRP in small intestine may be the major target for interaction between ELT and rosuvastatin in humans.
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Fujinaga H, Takeuchi K, Kaneda K, Takasaki Y, Hashimoto H. Analysis of autoantibodies to cell cycle-associated antigens. Mod Rheumatol 2014; 11:222-9. [DOI: 10.3109/s101650170008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Shinozaki T, Takagishi K, Tsutsumi S, Yanagawa T, Takeuchi K, Watanabe H, Fukuda T. Effects of FR167653, a dual inhibitor of interleukin-1 and tumor necrosis factor, on adjuvant arthritis in rats. Mod Rheumatol 2014; 11:300-3. [DOI: 10.3109/s10165-001-8059-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Ouchi A, Yokoyama M, Takeuchi K, Nitta H, Ueda K, Nishimura N, Tsuyama N, Terui Y, Hatake K. GDP Chemotherapy for Relapsed/Refractory Lymphomas is Effective and Safe. Ann Oncol 2013. [DOI: 10.1093/annonc/mdt460.113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Nishimura N, Terui Y, Ouchi A, Ueda K, Nitta H, Yokoyama M, Tsuyama N, Takeuchi K, Hatake K. Incidence of Deep Vein Thrombosis (DVE) in Myeloma Patients Treated with Lenalidomide/ Dexamethasone with Prophylaxis. Ann Oncol 2013. [DOI: 10.1093/annonc/mdt459.96] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Takeuchi K, Mashimo Y, Shimojo N, Arima T, Inoue Y, Morita Y, Sato K, Suzuki S, Nishimuta T, Watanabe H, Hoshioka A, Tomiita M, Yamaide A, Watanabe M, Okamoto Y, Kohno Y, Hata A, Suzuki Y. Functional variants in the thromboxane A2 receptor gene are associated with lung function in childhood-onset asthma. Clin Exp Allergy 2013; 43:413-24. [PMID: 23517037 DOI: 10.1111/cea.12058] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2011] [Revised: 09/24/2012] [Accepted: 10/25/2012] [Indexed: 12/14/2022]
Abstract
BACKGROUND The thromboxane A2 receptor (TBXA2R) gene is associated with asthma, but no functional genetic variations are known to associate with the disease or its related phenotypes. OBJECTIVE To investigate the association of TBXA2R polymorphisms with asthma susceptibility and related phenotypes and to identify functionally relevant polymorphisms. METHODS We performed comprehensive sequencing of the TBXA2R gene in 48 Japanese control subjects and found a set of variants (SNP1 G>T rs2238634, SNP2 T>G rs2238633, SNP3 C>T rs2238632 and SNP4 G>A rs2238631) in intron 1 in linkage disequilibrium with c.795 T>C rs1131882, which was previously reported to be associated with asthma and related phenotypes. To investigate the effect of four common haplotypes (H1, H2, H3 and H4) on transcriptional activity, we performed a luciferase assay in primary bronchial smooth muscle cells (BSMCs) and human airway epithelial cells (BEAS-2B). We also studied the haplotype association with lung function, TBXA2R mRNA levels, and eosinophil fraction/count in peripheral blood in childhood-onset asthma patients and/or controls. RESULTS H2 and H4, containing minor alleles of SNP2 and SNP3, had significantly higher transcriptional activities than H1 consisting of major alleles (P < 0.001 in BSMCs and BEAS-2B). Homozygotes for redefined haplotype h2 corresponding to minor alleles of SNP2 and SNP3 were associated with lower lung function in childhood-onset asthma patients compared to other zygotes (baseline Forced expiratory volume in one second (FEV1)/ Forced vital capacity (FVC) and Forced expiratory flow between 25% and 75% of the FVC (%FEF(25-75%)): P = 0.00201 and 0.0128, respectively, and post-bronchodilator FEV1/FVC and %FEF(25-75%): P = 0.00224 and 0.0393 respectively). Haplotype h2 was also associated with higher mRNA levels in control peripheral blood cells and higher blood eosinophil fractions and counts in female controls. CONCLUSIONS AND CLINICAL RELEVANCE Genetic variants were identified in the TBXA2R gene that influenced transcriptional activity and were associated with asthma-related phenotypes. Thromboxane pathways may therefore play important roles in airway inflammation and remodelling in asthma patients.
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Takeuchi K, Kurematsu T, Kishita H, Nagai Y, Fukumoto Y, Homan Y. Utilization of hysteroscopy in frozen-thawed embryo transfer (FET) cycles. Fertil Steril 2013. [DOI: 10.1016/j.fertnstert.2013.07.1057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Yasuda M, Kato S, Yamanaka N, Iimori M, Matsumoto K, Utsumi D, Kitahara Y, Amagase K, Horie S, Takeuchi K. 5-HT₃ receptor antagonists ameliorate 5-fluorouracil-induced intestinal mucositis by suppression of apoptosis in murine intestinal crypt cells. Br J Pharmacol 2013; 168:1388-400. [PMID: 23072534 DOI: 10.1111/bph.12019] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2012] [Revised: 09/23/2012] [Accepted: 10/02/2012] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND AND PURPOSE Chemotherapeutic agents, including 5-fluorouracil (5-FU), frequently cause intestinal mucositis resulting in severe diarrhoea and morphological mucosal damage. 5-HT₃ receptor antagonists are clinically effective in the treatment of nausea and emesis during cancer chemotherapy. Therefore we here have examined the effects of 5-HT₃ receptor antagonists on 5-FU-induced intestinal mucositis in mice. EXPERIMENTAL APPROACH Intestinal mucositis was induced in male C57BL/6 mice by daily administration of 5-FU (50 mg·kg⁻¹) for 5 days. Effects of 5-HT₃ receptor antagonists, ramosetron (0.01-0.1 mg·kg⁻¹) and ondansetron (5 mg·kg⁻¹), on the accompanying histology, cytokine production and apoptosis were assessed. KEY RESULTS Continuous administration of 5-FU to mice caused severe intestinal mucositis, which was histologically characterized by the shortening of villi and destruction of intestinal crypts, accompanied by body weight loss and diarrhoea. Daily ramosetron administration dose-dependently reduced the severity of intestinal mucositis, body weight loss and diarrhoea. Similar beneficial effects were observed with ondansetron. The number of apoptotic, caspase-3- and caspase-8-activated cells increased 24 h after the first 5-FU administration, and these responses were reduced by ramosetron. The up-regulation of TNF-α, IL-1β and IL-6 following 5-FU treatment was also attenuated by ramosetron. CONCLUSIONS AND IMPLICATIONS 5-HT₃ receptor antagonists ameliorated 5-FU-induced intestinal mucositis in mice, and this action could result from suppression of apoptotic responses in the intestinal crypt cells via inhibition of cytokine expression. Thus, 5-HT₃ receptor antagonists may be useful for preventing not only nausea and emesis but also intestinal mucositis during 5-FU chemotherapy.
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