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Shwartz S, Fuchs M, Hastings JB, Inubushi Y, Ishikawa T, Katayama T, Reis DA, Sato T, Tono K, Yabashi M, Yudovich S, Harris SE. X-ray second harmonic generation. PHYSICAL REVIEW LETTERS 2014; 112:163901. [PMID: 24815649 DOI: 10.1103/physrevlett.112.163901] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2013] [Indexed: 05/27/2023]
Abstract
We report clear experimental evidence for second harmonic generation at hard x-ray wavelengths. Using a 1.7 Å pumping beam generated by a free electron laser, we observe second harmonic generation in diamond. The generated second harmonic is of order 10 times the background radiation, scales quadratically with pump pulse energy, and is generated over a narrow phase-matching condition. Of importance for future experiments, our results indicate that it is possible to observe nonlinear x-ray processes in crystals at pump intensities exceeding 1016 W/cm2.
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Matsuzaki C, Kamishima K, Matsumoto K, Koga H, Katayama T, Yamamoto K, Hisa K. Immunomodulating activity of exopolysaccharide-producing Leuconostoc mesenteroides strain NTM048 from green peas. J Appl Microbiol 2014; 116:980-9. [PMID: 24314091 DOI: 10.1111/jam.12411] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2013] [Revised: 11/14/2013] [Accepted: 12/02/2013] [Indexed: 02/04/2023]
Abstract
AIMS The present work was aimed to find novel probiotics to enhance the mucosal barrier function of humans. The effectiveness was evaluated in vitro and in vivo. METHODS AND RESULTS Stimulation of IgA production in mucosal surfaces is one of the most beneficial traits of lactic acid bacteria (LAB) for enhancing the barrier. Therefore, 173 LAB strains were evaluated for the ability to induce IgA production using murine Peyer's patch cells. Strain NTM048 isolated from green peas showed the highest activity and was identified as Leuconostoc mesenteroides subsp. mesenteroides. This strain was found to tolerate gastrointestinal digestion and produce large amounts of exopolysaccharides, which possess IgA-inducing activity. Dietary supplementation with NTM048 induced a significant increase in the faecal IgA content and plasma IgA levels of BALB/cA mice. A gene expression analysis of Peyer's patch cells revealed that the transforming growth factor-β and activation-induced cytidine deaminase genes were upregulated by NTM048 intake. CONCLUSIONS Strain NTM048 stimulates Peyer's patch cells to induce intestinal and systemic immune response, revealing the potential of NTM048 as a probiotic for enhancing the mucosal barrier function. SIGNIFICANCE AND IMPACT OF THE STUDY This report demonstrates a food-applicable Leuconostoc mesenteroides strain secreting exopolysaccharide that shows high IgA-inducing ability.
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Viborg AH, Katayama T, Abou Hachem M, Andersen MC, Nishimoto M, Clausen MH, Urashima T, Svensson B, Kitaoka M. Distinct substrate specificities of three glycoside hydrolase family 42 -galactosidases from Bifidobacterium longum subsp. infantis ATCC 15697. Glycobiology 2013; 24:208-16. [DOI: 10.1093/glycob/cwt104] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
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Kuroyanagi M, Katayama T, Imai T, Yamamoto Y, Chisada SI, Yoshiura Y, Ushijima T, Matsushita T, Fujita M, Nozawa A, Suzuki Y, Kikuchi K, Okamoto H. New approach for fish breeding by chemical mutagenesis: establishment of TILLING method in fugu (Takifugu rubripes) with ENU mutagenesis. BMC Genomics 2013; 14:786. [PMID: 24225309 PMCID: PMC3830513 DOI: 10.1186/1471-2164-14-786] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2013] [Accepted: 11/04/2013] [Indexed: 11/26/2022] Open
Abstract
Background In fish breeding, it is essential to discover and generate fish exhibiting an effective phenotype for the aquaculture industry, but screening for natural mutants by only depending on natural spontaneous mutations is limited. Presently, reverse genetics has become an important tool to generate mutants, which exhibit the phenotype caused by inactivation of a gene. TILLING (Targeting Induced Local Lesions INGenomes) is a reverse genetics strategy that combines random chemical mutagenesis with high-throughput discovery technologies for screening the induced mutations in target genes. Although the chemical mutagenesis has been used widely in a variety of model species and also genetic breeding of microorganisms and crops, the application of the mutagenesis in fish breeding has been only rarely reported. Results In this study, we developed the TILLING method in fugu with ENU mutagenesis and high-resolution melting (HRM) analysis to detect base pair changes in target sequences. Fugu males were treated 3 times at weekly intervals with various ENU concentrations, and then the collected sperm after the treatment was used to fertilize normal female for generating the mutagenized population (F1). The fertilization and the hatching ratios were similar to those of the control and did not reveal a dose dependency of ENU. Genomic DNA from the harvested F1 offspring was used for the HRM analysis. To obtain a fish exhibiting a useful phenotype (e.g. high meat production and rapid growth), fugu myostatin (Mstn) gene was examined as a target gene, because it has been clarified that the mstn deficient medaka exhibited double-muscle phenotype in common with MSTN knockout mice and bovine MSTN mutant. As a result, ten types of ENU-induced mutations were identified including a nonsense mutation in the investigated region with HRM analysis. In addition, the average mutation frequency in fugu Mstn gene was 1 mutant per 297 kb, which is similar to values calculated for zebrafish and medaka TILLING libraries. Conclusions These results demonstrate that the TILLING method in fugu was established. We anticipate that this TILLING approach can be used to generate a wide range of mutant alleles, and be applicable to many farmed fish that can be chemically mutagenized.
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Beye M, Anniyev T, Coffee R, Dell'Angela M, Föhlisch A, Gladh J, Katayama T, Kaya S, Krupin O, Møgelhøj A, Nilsson A, Nordlund D, Nørskov JK, Öberg H, Ogasawara H, Pettersson LGM, Schlotter WF, Sellberg JA, Sorgenfrei F, Turner JJ, Wolf M, Wurth W, Oström H. Selective ultrafast probing of transient hot chemisorbed and precursor states of CO on Ru(0001). PHYSICAL REVIEW LETTERS 2013; 110:186101. [PMID: 23683223 DOI: 10.1103/physrevlett.110.186101] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Revised: 04/03/2013] [Indexed: 05/19/2023]
Abstract
We have studied the femtosecond dynamics following optical laser excitation of CO adsorbed on a Ru surface by monitoring changes in the occupied and unoccupied electronic structure using ultrafast soft x-ray absorption and emission. We recently reported [M. Dell'Angela et al. Science 339, 1302 (2013)] a phonon-mediated transition into a weakly adsorbed precursor state occurring on a time scale of >2 ps prior to desorption. Here we focus on processes within the first picosecond after laser excitation and show that the metal-adsorbate coordination is initially increased due to hot-electron-driven vibrational excitations. This process is faster than, but occurs in parallel with, the transition into the precursor state. With resonant x-ray emission spectroscopy, we probe each of these states selectively and determine the respective transient populations depending on optical laser fluence. Ab initio molecular dynamics simulations of CO adsorbed on Ru(0001) were performed at 1500 and 3000 K providing insight into the desorption process.
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Dell'Angela M, Anniyev T, Beye M, Coffee R, Fohlisch A, Gladh J, Katayama T, Kaya S, Krupin O, LaRue J, Mogelhoj A, Nordlund D, Norskov JK, Oberg H, Ogasawara H, Ostrom H, Pettersson LGM, Schlotter WF, Sellberg JA, Sorgenfrei F, Turner JJ, Wolf M, Wurth W, Nilsson A. Real-Time Observation of Surface Bond Breaking with an X-ray Laser. Science 2013; 339:1302-5. [DOI: 10.1126/science.1231711] [Citation(s) in RCA: 166] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Machida Y, Kubota K, Katayama T, Toriihara A, Shibuya H. Diagnostic performance of fluorodeoxyglucose-positron emission tomography/computed tomography combined with ultrasonography-guided fine needle aspiration cytology for identifying axillary lymph node status in patients with breast cancer. Eur J Surg Oncol 2013; 39:26-30. [DOI: 10.1016/j.ejso.2012.10.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2012] [Revised: 08/30/2012] [Accepted: 10/12/2012] [Indexed: 02/05/2023] Open
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Matsushita T, Yajima K, Sumitomo H, Shigeta M, Nishimura K, Shirabe S, Sakai M, Katayama T, Kanno K, Sakurai H, Nakano T, Kitaoka M, Ueki A. [A questionnaire survey on current status of anti-diabetic therapy for diabetic patients with dementia]. Nihon Ronen Igakkai Zasshi 2013; 50:219-226. [PMID: 23979245 DOI: 10.3143/geriatrics.50.219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
AIM It is important to establish treatment goals and optimal anti-diabetic therapy for diabetic patients with dementia. However, there are currently no established treatment guidelines. Recently, the West Tokyo Diabetes Association has established the Diabetes and Dementia Study Group to investigate the status of anti-diabetic therapy for diabetic patients with dementia. Here, we assessed the current status of such patients by a questionnaire survey. METHODS In November 2011, we conducted a mailed survey to the clinics and hospitals affiliated with Kita-Tama, Hachioji and Tachikawa Medical Associations in Tokyo, Japan. The survey evaluated the most suitable anti-diabetic therapy for elderly diabetic patients or diabetic patients with dementia, combined anti-diabetic therapy, insulin therapy for elderly diabetic patients and diabetic patients with dementia, combination therapy of insulin and oral anti-diabetic agents for diabetic patients with dementia, factors that make it difficult for diabetic patients with dementia to continue insulin therapy, and selection of treatment or care for diabetic patients with dementia. RESULTS The responses indicated that the anti-diabetic agents appropriate for diabetic patients with dementia are dipeptidyl peptidase-4 inhibitors. Those inappropriate for the same patients are metformin and insulin. Family support was a major factor for insulin therapy continuation for diabetic patients with dementia. Moreover, anti-diabetic agents for these patients are selected according to their ease of use and compatibility with available familial and social resources. CONCLUSION Our survey results can be utilized for the creation of new guidelines and educational resources for the anti-diabetic therapy of diabetic patients with dementia.
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Okamoto M, Katayama T, Suzuki Y, Hoshino KY, Yamada H, Matsuoka N, Jodo E. Neonatal administration of phencyclidine decreases the number of putative inhibitory interneurons and increases neural excitability to auditory paired clicks in the hippocampal CA3 region of freely moving adult mice. Neuroscience 2012; 224:268-81. [PMID: 22906477 DOI: 10.1016/j.neuroscience.2012.08.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2012] [Revised: 08/08/2012] [Accepted: 08/10/2012] [Indexed: 10/28/2022]
Abstract
Animals exposed to phencyclidine (PCP) during the neonatal period have fewer GABAergic interneurons in the corticolimbic area, including the hippocampus, and exhibit abnormal behaviors after attaining maturation that correspond with schizophrenic symptoms. Since a lack of inhibitory interneurons in the hippocampus has also been reported in postmortem studies of patients with schizophrenia, the deficit may induce abnormal activity of hippocampal neurons that underlies pathological states in schizophrenia. However, it remains unclear how PCP treatment during the neonatal period affects the discharge activity of hippocampal neurons in adulthood. In the current study, single unit responses of hippocampal CA3 neurons to paired auditory clicks were recorded in freely moving mice repeatedly injected with PCP or saline during the neonatal period. The recorded neurons were classified into two subpopulations, narrow-spike neurons and broad-spike neurons, based on the spike width. The spontaneous discharge rate was higher in the narrow-spike neurons than in the broad-spike neurons, indicating that the narrow-spike neurons correspond with hippocampal inhibitory neurons. The proportion of narrow-spike neurons was significantly smaller in neonatally PCP-treated mice than in saline-treated mice. The broad-spike neurons that exhibited a response magnitude to the second click as large as that to the first click (E/E-type response) showed longer response duration to the paired clicks in PCP-treated mice than in the saline-treated mice. Further, the number of neurons with E/E-type response was higher in the PCP-treated mice than in the saline-treated mice. Finally, the attenuation of an auditory-evoked potential component, N40, to the second click (sensory gating) was blunted in the PCP-treated mice when compared with that in the saline-treated mice. These results suggest that the neonatal administration of PCP induced a deficit of inhibitory interneurons and altered discharge activity of neurons in the hippocampal CA3 region to the paired clicks, thereby inducing the deficit in sensory gating.
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Suzuki R, Katayama T, Furuya Y. [Detection of parechovirus in infectious gastroenteritis patients from Kanagawa Prefecture Region. Fecal specimens sent from the pediatric sentinel clinics from April 2008 to March 2011]. KANSENSHOGAKU ZASSHI. THE JOURNAL OF THE JAPANESE ASSOCIATION FOR INFECTIOUS DISEASES 2012; 86:393-399. [PMID: 22991845 DOI: 10.11150/kansenshogakuzasshi.86.393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
To clarify the causative viruses of infectious gastroenteritis, fecal specimens were sent from the pediatric sentinel clinic in Kanagawa Prefecture except for Kawasaki City, Yokohama City, Yokosuka City, Sagamihara City, and Fujisawa City. About 50% of fecal specimens were not negative for causative viruses. A total of 374 fecal specimens which were known to be negative for rotavirus, adenovirus, norovirus, sapovirus, and astrovirus were tested for human parechovirus (HPeV). HPeVs VP1 genes were detected in 15 samples from 374 fecal specimens which were tested from April 2008 to March 2011. Sequencing analysis of a 800-nt portion of the HPeV VP1 gene of these 8 strains and 7 specimens from April 2008 to March 2011 showed that one specimen in Septenber 2008 was classified as HPeV4 and 14 of the others were classified as HPeV1.
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Ishikawa T, Miyata S, Koyama Y, Yoshikawa K, Hattori T, Kumamoto N, Shingaki K, Katayama T, Tohyama M. Transient expression of Xpn, an XLMR protein related to neurite extension, during brain development and participation in neurite outgrowth. Neuroscience 2012; 214:181-91. [PMID: 22531377 DOI: 10.1016/j.neuroscience.2012.04.030] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2011] [Revised: 03/11/2012] [Accepted: 04/09/2012] [Indexed: 12/22/2022]
Abstract
KIAA2022 has been implicated as a gene responsible for expressing X-linked mental retardation (XLMR) proteins in humans. However, the functional role of KIAA2022 in the human brain remains unclear. Here, we revealed that depletion of Kiaa2022 inhibits neurite outgrowth of PC12 cells, indicating that the gene participates in neurite extension. Thus, we termed Kiaa2022 as an XLMR protein related to neurite extension (Xpn). Using the mouse brain as a model and ontogenetic analysis of Xpn by real-time PCR, we clearly demonstrated that Xpn is expressed transiently during the late embryonic and perinatal stages. In situ hybridization histochemistry further revealed that Xpn-expressing neurons could be categorized ontogenetically into three types. The first type showed transient expression of Xpn during development. The second type maximally expressed Xpn during the late embryonic or perinatal stage. Thereafter, Xpn expression in this type of neuron decreased gradually throughout development. Nevertheless, a significant level of Xpn expression was detected even into adulthood. The third type of neurons initiated expression of Xpn during the embryonic stage, and continued to express the gene throughout the remaining developmental stages. Subsequent immunohistochemical analysis revealed that Xpn was localized to the nucleus and cytoplasm throughout brain development. Our findings indicate that Xpn may participate in neural circuit formation during developmental stages via nuclear and cytoplasmic Xpn. Moreover, disturbances of this neuronal circuit formation may play a role in the pathogenesis of mental retardation.
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Katayama T, Kubota K, Machida Y, Toriihara A, Shibuya H. Evaluation of sequential FDG-PET/CT for monitoring bone metastasis of breast cancer during therapy: correlation between morphological and metabolic changes with tumor markers. Ann Nucl Med 2012; 26:426-35. [DOI: 10.1007/s12149-012-0595-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2011] [Accepted: 03/15/2012] [Indexed: 10/28/2022]
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Koyanagi T, Kiyohara M, Matsui H, Yamamoto K, Kondo T, Katayama T, Kumagai H. Pyrosequencing survey of the microbial diversity of ‘narezushi’, an archetype of modern Japanese sushi. Lett Appl Microbiol 2011; 53:635-40. [DOI: 10.1111/j.1472-765x.2011.03155.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Hirai S, Katayama T, Chatani N, Okada K, Mitsui N, Hamanaka Y. [Surgical resection of a pulmonary pleomorphic carcinoma involving the azygos vein]. KYOBU GEKA. THE JAPANESE JOURNAL OF THORACIC SURGERY 2011; 64:394-397. [PMID: 21591442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We report a case of surgical treatment of pulmonary pleomorphic carcinoma invading the azygos vein. Chest computed tomography (CT) revealed a mass of 6 cm in size, in the upper lobe of the right lung. He underwent the right upper lobectomy and lymph node dissection with combined resection of the involved azygos vein. Histological examination revealed pleomorphic carcinoma (pT3N0M0, stage IIB). The postoperative course was uneventful, and he was alive without recurrence 26 months after the operation. Six cases of pleomorphic carcinoma have been surgically treated between June 2008 and August 2009 in our institute. Early diagnose with complete resection is suggested to be essential in the improvement of survival for this disease based on review of our experience.
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Brouchkov AV, Melnikov VP, Sukhovei YG, Griva GI, Repin VE, Kalenova LF, Brenner EV, Subbotin AM, Trofimova YB, Tanaka M, Katayama T, Utsumi M. Relict microorganisms of cryolithozone as possible objects of gerontology. ADVANCES IN GERONTOLOGY 2011. [DOI: 10.1134/s207905701101005x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Alam S, Suzuki T, Katayama T. Absolute Configuration of Syringylglycerol-8-O-4’-(Sinapyl Alcohol) Ethers, Neolignans as Well as Lignin Substructure Dimeric Compounds in Higher Plants. ACTA ACUST UNITED AC 2011. [DOI: 10.3923/ajbs.2011.157.165] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Hattori T, Shimizu S, Koyama Y, Yamada K, Kuwahara R, Kumamoto N, Matsuzaki S, Ito A, Katayama T, Tohyama M. DISC1 regulates cell-cell adhesion, cell-matrix adhesion and neurite outgrowth. Mol Psychiatry 2010; 15:778, 798-809. [PMID: 20479754 DOI: 10.1038/mp.2010.60] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Disrupted-in-schizophrenia 1 (DISC1) is a promising susceptibility gene for major mental illness. Recent studies have implicated DISC1 in key neurodevelopmental processes, including neurite outgrowth, neuronal migration and proliferation. Here, we report that DISC1 regulates cell-cell and cell-matrix adhesion and neurite outgrowth. DISC1 overexpression increased expression of the adherence junction protein N-cadherin and enhanced cell-cell adhesion. The increased N-cadherin accumulated in the areas of cell-cell contact. DISC1 overexpression also enhanced cell-matrix adhesion by inducing expression of beta1-integrin protein. In the presence of nerve growth factor (NGF), DISC1 overexpression increased beta1-integrin expression at the cell membrane and growth cone. NGF-induced neurite extension was enhanced by DISC1, and anti-beta1-integrin antibody reduced the neurite outgrowth of DISC1-overexpressing cells to the control level. Furthermore, DISC1 also regulated N-cadherin and beta1-integrin expression at the cell membrane in primary neurons. We conclude that DISC1 regulates cell-cell adhesion and cell-matrix adhesion by regulating the expression of adhesion molecules.
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Furuya Y, Katayama T. [Japanese spotted fever]. NIHON RINSHO. JAPANESE JOURNAL OF CLINICAL MEDICINE 2010; 68 Suppl 6:240-243. [PMID: 20942048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
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Matsubara Y, Ota M, Bito A, Katayama T, Matsubara K, Ito M. Prenatal diagnosis of Berry syndrome by fetal echocardiography. ULTRASOUND IN OBSTETRICS & GYNECOLOGY : THE OFFICIAL JOURNAL OF THE INTERNATIONAL SOCIETY OF ULTRASOUND IN OBSTETRICS AND GYNECOLOGY 2010; 35:374-376. [PMID: 20104532 DOI: 10.1002/uog.7565] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
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Boisnier E, Sagawa T, Komatsu T, Takagi N, Katayama M, Katayama T. A habitat association index to distinguish resident species along marine artificial reefs. COMMUNITY ECOL 2009. [DOI: 10.1556/comec.10.2009.2.5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Torigoe H, Sasaki K, Katayama T. Thermodynamic and Kinetic Effects of Morpholino Modification on Pyrimidine Motif Triplex Nucleic Acid Formation under Physiological Condition. J Biochem 2009; 146:173-83. [DOI: 10.1093/jb/mvp059] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Falah S, Suzuki T, Katayama T. Chemical constituents from Swietenia macrophylla bark and their antioxidant activity. Pak J Biol Sci 2009; 11:2007-12. [PMID: 19266907 DOI: 10.3923/pjbs.2008.2007.2012] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Chemical constituents of the bark of Swietenia macrophylla King (Meliaceae) was investigated not only to develop further bark utilization but also to understand the biochemical function of the bark in the forest environment. A new phenylpropanoid-substituted catechin, namely, swietemacrophyllanin [(2R*,3S*,7"R*)-catechin-8,7"-7,2"-epoxy-(methyl 4",5"-dihydroxyphenylpropanoate)] (1) was isolated from the bark of S. macrophylla together with two known compounds, catechin (2) and epicatechin (3). The structure of 1 was elucidated by spectroscopic data and by comparison of the NMR data with those of catiguanins A and B, phenylpropanoid-substituted epicatechins. The 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging activity of the isolated compounds indicated that all of the three compounds have strong activity compared with trolox as a reference. Swietemacrophyllanin (1) had the strongest activity with a 50% inhibitory concentration (IC50) value of 56 microg mL(-1).
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Katayama T, Kato T, Tanaka M, Douglas TA, Brouchkov A, Fukuda M, Tomita F, Asano K. Glaciibacter superstes gen. nov., sp. nov., a novel member of the family Microbacteriaceae isolated from a permafrost ice wedge. Int J Syst Evol Microbiol 2009; 59:482-6. [DOI: 10.1099/ijs.0.001354-0] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Tanaka K, Katsura T, Kinoshita Y, Katayama T, Uno K. Mechanical properties of jute fabric reinforced thermoplastic moulded by high-speed processing using electromagnetic induction. ACTA ACUST UNITED AC 2008. [DOI: 10.2495/hpsm080231] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Katayama T, Jodo E, Suzuki Y, Hoshino KY, Takeuchi S, Kayama Y. Activation of medial prefrontal cortex neurons by phencyclidine is mediated via AMPA/kainate glutamate receptors in anesthetized rats. Neuroscience 2007; 150:442-8. [DOI: 10.1016/j.neuroscience.2007.09.007] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2007] [Revised: 08/30/2007] [Accepted: 09/12/2007] [Indexed: 11/16/2022]
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