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Chen L, Nabil A, Fujisawa N, Oe E, Li K, Ebara M. A facile, flexible, and multifunctional thermo-chemotherapy system for customized treatment of drug-resistant breast cancer. J Control Release 2023; 363:550-561. [PMID: 37804880 DOI: 10.1016/j.jconrel.2023.10.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 10/02/2023] [Accepted: 10/04/2023] [Indexed: 10/09/2023]
Abstract
Anticancer drug resistance invariably emerges and poses a significant barrier to curative therapy for various breast cancers. This results in a lack of satisfactory therapeutic medicine for cancer treatment. Herein, a universal vector system for drug-resistance breast cancer was designed to meet the needs of reversed multidrug resistance, thermo-chemotherapy, and long-term drug release behavior. The vector system comprises polycaprolactone (PCL) nanofiber mesh and magnetic nanoparticles (MNPs). PCL has excellent biocompatibility and electrospinning performance. In this study, MNPs were tailored to be thermogenic in response to an alternating magnetic field (AMF). PCL nanofiber can deliver various chemotherapy drugs, and suitable MNPs encapsulated in the nanofiber can generate hyperthermia and synergistic effect with those chemotherapy drugs. Therefore, a more personalized treatment system can be developed for different breast malignancies. In addition, the PCL nanofiber mesh (NFM) enables sustained release of the drugs for up two months, avoiding the burden on patients caused by repeated administration. Through model drugs doxorubicin (DOX) and chemosensitizers curcumin (CUR), we systematically verified the therapeutic effect of DOX-resistance breast cancer and inhibition of tumor generation in vivo. These findings represent a multifaceted platform of importance for validating strategic reversed MDR in pursuit of promoted thermo-chemotherapeutic outcomes. More importantly, the low cost and excellent safety and efficacy of this nanofiber mesh demonstrate that this can be customized multi-function vector system may be a promising candidate for refractory cancer therapy in clinical.
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Affiliation(s)
- Lili Chen
- Research Center for Macromolecules and Biomaterials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Ahmed Nabil
- Research Center for Macromolecules and Biomaterials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan; Biotechnology and Life Sciences Department, Faculty of Postgraduate Studies for Advanced Sciences (PSAS), Beni-Suef University, Beni-Suef 62511, Egypt
| | - Nanami Fujisawa
- Research Center for Macromolecules and Biomaterials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan; Biotechnology and Life Sciences Department, Faculty of Postgraduate Studies for Advanced Sciences (PSAS), Beni-Suef University, Beni-Suef 62511, Egypt
| | - Emiho Oe
- Research Center for Macromolecules and Biomaterials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan; Biotechnology and Life Sciences Department, Faculty of Postgraduate Studies for Advanced Sciences (PSAS), Beni-Suef University, Beni-Suef 62511, Egypt
| | - Kai Li
- Research Center for Macromolecules and Biomaterials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan; Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-0006, Japan; Ph.D. Program in Humanics, School of Integrative and Global Majors, University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan
| | - Mitsuhiro Ebara
- Research Center for Macromolecules and Biomaterials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan; Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-0006, Japan; Department of Materials Science and Technology, Tokyo University of Science, Tokyo 125-8585, Japan.
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Li Y, Matsumoto Y, Chen L, Sugawara Y, Oe E, Fujisawa N, Ebara M, Sakurai H. Smart Nanofiber Mesh with Locally Sustained Drug Release Enabled Synergistic Combination Therapy for Glioblastoma. Nanomaterials (Basel) 2023; 13:414. [PMID: 36770373 PMCID: PMC9919272 DOI: 10.3390/nano13030414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 01/16/2023] [Accepted: 01/17/2023] [Indexed: 06/18/2023]
Abstract
This study aims to propose a new treatment model for glioblastoma (GBM). The combination of chemotherapy, molecular targeted therapy and radiotherapy has been achieved in a highly simultaneous manner through the application of a safe, non-toxic, locally sustained drug-releasing composite Nanofiber mesh (NFM). The NFM consisted of biodegradable poly(ε-caprolactone) with temozolomide (TMZ) and 17-allylamino-17-demethoxygeldanamycin (17AAG), which was used in radiation treatment. TMZ and 17AAG combination showed a synergistic cytotoxicity effect in the T98G cell model. TMZ and 17AAG induced a radiation-sensitization effect, respectively. The NFM containing 17AAG or TMZ, known as 17AAG-NFM and TMZ-NFM, enabled cumulative drug release of 34.1% and 39.7% within 35 days. Moreover, 17AAG+TMZ-NFM containing both drugs revealed a synergistic effect in relation to the NFM of a single agent. When combined with radiation, 17AAG+TMZ-NFM induced in an extremely powerful cytotoxic effect. These results confirmed the application of NFM can simultaneously allow multiple treatments to T98G cells. Each modality achieved a significant synergistic effect with the other, leading to a cascading amplification of the therapeutic effect. Due to the superior advantage of sustained drug release over a long period of time, NFM has the promise of clinically addressing the challenge of high recurrence of GBM post-operatively.
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Affiliation(s)
- Yinuo Li
- Department of Radiation Oncology, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba 305-8575, Japan
| | - Yoshitaka Matsumoto
- Department of Radiation Oncology, Clinical Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba 305-8575, Japan
- Proton Medical Research Center, University of Tsukuba Hospital, Tsukuba 305-8576, Japan
| | - Lili Chen
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Japan
| | - Yu Sugawara
- Proton Medical Research Center, University of Tsukuba Hospital, Tsukuba 305-8576, Japan
| | - Emiho Oe
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Japan
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-0006, Japan
| | - Nanami Fujisawa
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Japan
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-0006, Japan
| | - Mitsuhiro Ebara
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Japan
| | - Hideyuki Sakurai
- Department of Radiation Oncology, Clinical Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba 305-8575, Japan
- Proton Medical Research Center, University of Tsukuba Hospital, Tsukuba 305-8576, Japan
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Oe E, Fujisawa N, Chen L, Uto K, Matsumoto Y, Ebara M. Locally Implantable Nanofibre Meshes by Sustained Release of Temozolomide for Combined Thermo-chemotherapy to Treat Glioblastoma. NEW J CHEM 2023. [DOI: 10.1039/d3nj00534h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
Glioblastoma (GBM) is a highly malignant brain tumour that arises from astrocytes or supportive brain tissue in adults. Although there are several therapeutic options, recurrence rates remain high with a...
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Chen L, Fujisawa N, Takanohashi M, Ebara M. An injectable hyperthermic nanofiber mesh with switchable drug release to stimulate chemotherapy potency. Front Bioeng Biotechnol 2022; 10:1046147. [PMID: 36406225 PMCID: PMC9669589 DOI: 10.3389/fbioe.2022.1046147] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Accepted: 10/14/2022] [Indexed: 11/19/2023] Open
Abstract
We developed a smart nanofiber mesh (SNM) with anticancer abilities as well as injectability and fast recovery from irregular to non-compressible shapes. The mesh can be injected at the tumor site to modulate and control anticancer effects by loading the chemotherapeutic drug, paclitaxel (PTX), as well as magnetic nanoparticles (MNPs). The storage modulus of the mesh decreases when applied with a certain shear strain, and the mesh can pass through a 14-gauge needle. Moreover, the fibrous morphology is maintained even after injection. In heat-generation measurements, the mesh achieved an effective temperature of mild hyperthermia (41-43°C) within 5 min of exposure to alternating magnetic field (AMF) irradiation. An electrospinning method was employed to fabricate the mesh using a copolymer of N-isopropylacrylamide (NIPAAm) and N-hydroxyethyl acrylamide (HMAAm), whose phase transition temperature was adjusted to a mildly hyperthermic temperature range. Pplyvinyl alcohol (PVA) was also incorporated to add shear-thinning property to the interactions between polymer chains derived from hydrogen bonding, The "on-off" switchable release of PTX from the mesh was detected by the drug release test. Approximately 73% of loaded PTX was released from the mesh after eight cycles, whereas only a tiny amount of PTX was released during the cooling phase. Furthermore, hyperthermia combined with chemotherapy after exposure to an AMF showed significantly reduced cancer cell survival compared to the control group. Subsequent investigations have proven that a new injectable local hyperthermia chemotherapy platform could be developed for cancer treatment using this SNM.
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Affiliation(s)
- Lili Chen
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), Tsukuba, Japan
| | - Nanami Fujisawa
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), Tsukuba, Japan
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan
| | - Masato Takanohashi
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), Tsukuba, Japan
| | - Mitsuhiro Ebara
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), Tsukuba, Japan
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan
- Department of Materials Science and Technology, Tokyo University of Science, Tokyo, Japan
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Yoshida T, Kaibori M, Fujisawa N, Ishizuka M, Sumiyama F, Hatta M, Kosaka H, Matsui K, Suzuki K, Akama TO, Katano T, Yoshii K, Ebara M, Sekimoto M. Efficacy of Nanofiber Sheets Incorporating Lenvatinib in a Hepatocellular Carcinoma Xenograft Model. Nanomaterials (Basel) 2022; 12:nano12081364. [PMID: 35458072 PMCID: PMC9025678 DOI: 10.3390/nano12081364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 03/31/2022] [Accepted: 04/13/2022] [Indexed: 11/10/2022]
Abstract
Lenvatinib has a high response rate in unresectable advanced hepatocellular carcinoma (HCC). In this study, we investigated whether lenvatinib-incorporating poly(ε-caprolactone) sheets (lenvatinib sheets) as a drug delivery system (DDS) exerted antitumor effects in a murine HCC model. The lenvatinib sheets were designed for sustained release of approximately 1 mg lenvatinib for 14 days. For 14 days, 1 mg lenvatinib was orally administered to mice. Then, we compared the antitumor effects of lenvatinib sheets with those of oral lenvatinib. The tumor volume, body weight, and serum lenvatinib level were measured for 14 days. A peritoneal dissemination model was established to examine the survival prolongation effect of the lenvatinib sheets. Tumor growth was significantly inhibited in the lenvatinib sheet group compared with that in the no treatment and oral groups. The antitumor effect was significantly higher in the lenvatinib sheet group. Regardless of the insertion site, the serum lenvatinib levels were maintained and showed similar antitumor effects. The mitotic index was significantly inhibited in the lenvatinib sheet group compared with that in the control group. Furthermore, lenvatinib sheets improved the 30-day survival. Lenvatinib sheets showed sufficient antitumor effects and may serve as an effective novel DDS for advanced HCC.
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Affiliation(s)
- Terufumi Yoshida
- Department of Surgery, Kansai Medical University, 2-5-1 Shinmachi, Hirakata 573-1010, Japan; (T.Y.); (M.I.); (F.S.); (M.H.); (H.K.); (K.M.); (M.S.)
| | - Masaki Kaibori
- Department of Surgery, Kansai Medical University, 2-5-1 Shinmachi, Hirakata 573-1010, Japan; (T.Y.); (M.I.); (F.S.); (M.H.); (H.K.); (K.M.); (M.S.)
- Correspondence: ; Tel.: +81-72-804-0101 (ext. 56130)
| | - Nanami Fujisawa
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), Tsukuba 305-0044, Japan; (N.F.); (M.E.)
| | - Mariko Ishizuka
- Department of Surgery, Kansai Medical University, 2-5-1 Shinmachi, Hirakata 573-1010, Japan; (T.Y.); (M.I.); (F.S.); (M.H.); (H.K.); (K.M.); (M.S.)
| | - Fusao Sumiyama
- Department of Surgery, Kansai Medical University, 2-5-1 Shinmachi, Hirakata 573-1010, Japan; (T.Y.); (M.I.); (F.S.); (M.H.); (H.K.); (K.M.); (M.S.)
| | - Masahiko Hatta
- Department of Surgery, Kansai Medical University, 2-5-1 Shinmachi, Hirakata 573-1010, Japan; (T.Y.); (M.I.); (F.S.); (M.H.); (H.K.); (K.M.); (M.S.)
| | - Hisashi Kosaka
- Department of Surgery, Kansai Medical University, 2-5-1 Shinmachi, Hirakata 573-1010, Japan; (T.Y.); (M.I.); (F.S.); (M.H.); (H.K.); (K.M.); (M.S.)
| | - Kosuke Matsui
- Department of Surgery, Kansai Medical University, 2-5-1 Shinmachi, Hirakata 573-1010, Japan; (T.Y.); (M.I.); (F.S.); (M.H.); (H.K.); (K.M.); (M.S.)
| | - Kensuke Suzuki
- Department of Otolaryngology, Head and Neck Surgery, Kansai Medical University, Hirakata 573-1010, Japan;
| | - Tomoya O. Akama
- Department of Pharmacology, Kansai Medical University, Hirakata 573-1010, Japan;
| | - Tayo Katano
- Department of Medical Chemistry, Kansai Medical University, Hirakata 573-1010, Japan;
| | - Kengo Yoshii
- Department of Mathematics and Statistics in Medical Sciences, Kyoto Prefectural University of Medicine, Kyoto 606-0823, Japan;
| | - Mitsuhiro Ebara
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), Tsukuba 305-0044, Japan; (N.F.); (M.E.)
| | - Mitsugu Sekimoto
- Department of Surgery, Kansai Medical University, 2-5-1 Shinmachi, Hirakata 573-1010, Japan; (T.Y.); (M.I.); (F.S.); (M.H.); (H.K.); (K.M.); (M.S.)
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Fujisawa N, Takanohashi M, Chen L, Uto K, Matsumoto Y, Takeuchi M, Ebara M. A Diels-Alder polymer platform for thermally enhanced drug release toward efficient local cancer chemotherapy. Sci Technol Adv Mater 2021; 22:522-531. [PMID: 34220340 PMCID: PMC8231351 DOI: 10.1080/14686996.2021.1939152] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
We reports a novel thermally enhanced drug release system synthesized via a dynamic Diels-Alder (DA) reaction to develop chemotherapy for pancreatic cancer. The anticancer prodrug was designed by tethering gemcitabine (GEM) to poly(furfuryl methacrylate) (PFMA) via N-(3-maleimidopropionyloxy)succinimide as a linker by DA reaction (PFMA-L-GEM). The conversion rate of the DA reaction was found to be approximately 60% at room temperature for 120 h. The reversible deconstruction of the DA covalent bond in retro Diels-Alder (rDA) reaction was confirmed by proton nuclear magnetic resonance, and the reaction was significantly accelerated at 90 °C. A PFMA-LGEM film containing magnetic nanoparticles (MNPs) was prepared for thermally enhanced release of the drug via the rDA reaction. Drug release was initiated by heating MNPs by alternating magnetic field. This enables local heating within the film above the rDA reaction temperature while maintaining a constant surrounding medium temperature. The MNPs/PFMA-L-GEM film decreased the viability of pancreatic cancer cells by 49% over 24 h. Our results suggest that DA/rDA-based thermally enhanced drug release systems can serve as a local drug release platform and deliver the target drug within locally heated tissue, thereby improving the therapeutic efficiency and overcoming the side effects of conventional drugs used to treat pancreatic cancer.
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Affiliation(s)
- Nanami Fujisawa
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), Tsukuba, Japan
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan
| | - Masato Takanohashi
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), Tsukuba, Japan
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan
| | - Lili Chen
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), Tsukuba, Japan
| | - Koichiro Uto
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), Tsukuba, Japan
| | - Yoshitaka Matsumoto
- Department of Radiation Oncology, University of Tsukuba Hospital, Tsukuba, Japan
| | - Masayuki Takeuchi
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), Tsukuba, Japan
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan
| | - Mitsuhiro Ebara
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), Tsukuba, Japan
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan
- Graduate School of Advanced Engineering, Department of Materials Science and Technology, Tokyo University of Science, Katsushika-ku, Japan
- CONTACT Mitsuhiro Ebara Research Center for Functional Materials, National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan
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Chen L, Fujisawa N, Takanohashi M, Najmina M, Uto K, Ebara M. A Smart Hyperthermia Nanofiber-Platform-Enabled Sustained Release of Doxorubicin and 17AAG for Synergistic Cancer Therapy. Int J Mol Sci 2021; 22:2542. [PMID: 33802613 PMCID: PMC7961598 DOI: 10.3390/ijms22052542] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 02/23/2021] [Accepted: 02/26/2021] [Indexed: 02/05/2023] Open
Abstract
This study demonstrates the rational fabrication of a magnetic composite nanofiber mesh that can achieve mutual synergy of hyperthermia, chemotherapy, and thermo-molecularly targeted therapy for highly potent therapeutic effects. The nanofiber is composed of biodegradable poly(ε-caprolactone) with doxorubicin, magnetic nanoparticles, and 17-allylamino-17-demethoxygeldanamycin. The nanofiber exhibits distinct hyperthermia, owing to the presence of magnetic nanoparticles upon exposure of the mesh to an alternating magnetic field, which causes heat-induced cell killing as well as enhanced chemotherapeutic efficiency of doxorubicin. The effectiveness of hyperthermia is further enhanced through the inhibition of heat shock protein activity after hyperthermia by releasing the inhibitor 17-allylamino-17-demethoxygeldanamycin. These findings represent a smart nanofiber system for potent cancer therapy and may provide a new approach for the development of localized medication delivery.
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Affiliation(s)
- Lili Chen
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan; (L.C.); (N.F.); (M.T.); (M.N.); (K.U.)
| | - Nanami Fujisawa
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan; (L.C.); (N.F.); (M.T.); (M.N.); (K.U.)
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-0006, Japan
| | - Masato Takanohashi
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan; (L.C.); (N.F.); (M.T.); (M.N.); (K.U.)
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-0006, Japan
| | - Mazaya Najmina
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan; (L.C.); (N.F.); (M.T.); (M.N.); (K.U.)
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-0006, Japan
| | - Koichiro Uto
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan; (L.C.); (N.F.); (M.T.); (M.N.); (K.U.)
| | - Mitsuhiro Ebara
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan; (L.C.); (N.F.); (M.T.); (M.N.); (K.U.)
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-0006, Japan
- Department of Materials Science and Technology, Tokyo University of Science, Tokyo 125-8585, Japan
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Yoshida S, Oya S, Obata H, Fujisawa N, Tsuchiya T, Nakamura T. Carotid Endarterectomy Restores Decreased Vision Due to Chronic Ocular Ischemia. J Vasc Surg 2021. [DOI: 10.1016/j.jvs.2020.11.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Ikarashi Y, Yamagata T, Yamagishi F, Fujisawa N. Unsteady turbulence structure in and downstream of a short elbow at post-critical Reynolds numbers. Nuclear Engineering and Design 2020. [DOI: 10.1016/j.nucengdes.2020.110649] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Mori S, Miura H, Yamazaki S, Suzuki T, Shimizu A, Seki Y, Kunugi T, Nishio S, Fujisawa N, Hishinuma A, Kikuchi M. Preliminary Design of a Solid Particulate Cooled Blanket for the Steady State Tokamak Reactor (SSTR). ACTA ACUST UNITED AC 2017. [DOI: 10.13182/fst92-a29973] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- S. Mori
- Kawasaki Heavy Industries, Ltd., 2-4-25 Minami-suna, Koto-ku,Tokyo, 136, Japan (3)3615-5147
| | - H. Miura
- Kawasaki Heavy Industries, Ltd., 2-4-25 Minami-suna, Koto-ku,Tokyo, 136, Japan (3)3615-5147
| | - S. Yamazaki
- Kawasaki Heavy Industries, Ltd., 2-4-25 Minami-suna, Koto-ku,Tokyo, 136, Japan (3)3615-5147
| | - T. Suzuki
- Kawasaki Heavy Industries, Ltd., 2-4-25 Minami-suna, Koto-ku,Tokyo, 136, Japan (3)3615-5147
| | - A. Shimizu
- Kyushu University, 6-1 Kasuga-koen, Kasuga city, Fukuoka-ken, 816, Japan (92)573-9611
| | - Y. Seki
- Japan Atomic Energy Research Institute, Naka-machi, Naka-gun, Ibaraki-ken, 311-01, Japan (292)70-7520
| | - T. Kunugi
- Japan Atomic Energy Research Institute, Naka-machi, Naka-gun, Ibaraki-ken, 311-01, Japan (292)70-7520
| | - S. Nishio
- Japan Atomic Energy Research Institute, Naka-machi, Naka-gun, Ibaraki-ken, 311-01, Japan (292)70-7520
| | - N. Fujisawa
- Japan Atomic Energy Research Institute, Naka-machi, Naka-gun, Ibaraki-ken, 311-01, Japan (292)70-7520
| | - A. Hishinuma
- Japan Atomic Energy Research Institute, Naka-machi, Naka-gun, Ibaraki-ken, 311-01, Japan (292)70-7520
| | - M. Kikuchi
- Japan Atomic Energy Research Institute, Naka-machi, Naka-gun, Ibaraki-ken, 311-01, Japan (292)70-7520
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Tone T, Fujisawa N, Seki Y, Iida H, Tachikawa K, Sugihara M, Minato A, Nishio S, Yamamoto T, Kitamura K, Ueda K, Saito S, Shimada R, Matsuda Y, Naruse Y, Shimamoto S, Tamura S, Yoshikawa M, Tomabechi K. Conceptual Design of Fusion Experimental Reactor(FER). ACTA ACUST UNITED AC 2017. [DOI: 10.13182/fst83-a22924] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- T. Tone
- Japan Atomic Energy Research Institute Naka-machi, Naka-gun, Ibaraki-ken, Japan (02929) 5-3111
| | - N. Fujisawa
- Japan Atomic Energy Research Institute Naka-machi, Naka-gun, Ibaraki-ken, Japan (02929) 5-3111
| | - Y. Seki
- Japan Atomic Energy Research Institute Naka-machi, Naka-gun, Ibaraki-ken, Japan (02929) 5-3111
| | - H. Iida
- Japan Atomic Energy Research Institute Naka-machi, Naka-gun, Ibaraki-ken, Japan (02929) 5-3111
| | - K. Tachikawa
- Japan Atomic Energy Research Institute Naka-machi, Naka-gun, Ibaraki-ken, Japan (02929) 5-3111
| | - M. Sugihara
- Japan Atomic Energy Research Institute Naka-machi, Naka-gun, Ibaraki-ken, Japan (02929) 5-3111
| | - A. Minato
- Japan Atomic Energy Research Institute Naka-machi, Naka-gun, Ibaraki-ken, Japan (02929) 5-3111
| | - S. Nishio
- Japan Atomic Energy Research Institute Naka-machi, Naka-gun, Ibaraki-ken, Japan (02929) 5-3111
| | - T. Yamamoto
- Japan Atomic Energy Research Institute Naka-machi, Naka-gun, Ibaraki-ken, Japan (02929) 5-3111
| | - K. Kitamura
- Japan Atomic Energy Research Institute Naka-machi, Naka-gun, Ibaraki-ken, Japan (02929) 5-3111
| | - K. Ueda
- Japan Atomic Energy Research Institute Naka-machi, Naka-gun, Ibaraki-ken, Japan (02929) 5-3111
| | - S. Saito
- Japan Atomic Energy Research Institute Naka-machi, Naka-gun, Ibaraki-ken, Japan (02929) 5-3111
| | - R. Shimada
- Japan Atomic Energy Research Institute Naka-machi, Naka-gun, Ibaraki-ken, Japan (02929) 5-3111
| | - Y. Matsuda
- Japan Atomic Energy Research Institute Naka-machi, Naka-gun, Ibaraki-ken, Japan (02929) 5-3111
| | - Y. Naruse
- Japan Atomic Energy Research Institute Naka-machi, Naka-gun, Ibaraki-ken, Japan (02929) 5-3111
| | - S. Shimamoto
- Japan Atomic Energy Research Institute Naka-machi, Naka-gun, Ibaraki-ken, Japan (02929) 5-3111
| | - S. Tamura
- Japan Atomic Energy Research Institute Naka-machi, Naka-gun, Ibaraki-ken, Japan (02929) 5-3111
| | - M. Yoshikawa
- Japan Atomic Energy Research Institute Naka-machi, Naka-gun, Ibaraki-ken, Japan (02929) 5-3111
| | - K. Tomabechi
- Japan Atomic Energy Research Institute Naka-machi, Naka-gun, Ibaraki-ken, Japan (02929) 5-3111
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Yamada E, Inamori M, Watanabe S, Sato T, Tagri M, Uchida E, Tanida E, Izumi M, Takeshita K, Fujisawa N, Komatsu K, Hamanaka J, Kanesaki A, Matsuhashi N, Nakajima A. Constipation is not associated with colonic diverticula: a multicenter study in Japan. Neurogastroenterol Motil 2015; 27:333-8. [PMID: 25469640 DOI: 10.1111/nmo.12478] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Accepted: 11/01/2014] [Indexed: 01/06/2023]
Abstract
BACKGROUND The association of diverticula with bowel habits is unclear. We therefore analyzed the association between diverticula and bowel habits in over 1000 Japanese individuals. METHODS Japanese subjects who underwent total colonoscopies at seven centers in Japan from June to September 2013 were analyzed. Bowel habits were evaluated using the Gastrointestinal Symptom Rating Scale, and stool form was assessed using a part of the Bristol Scale and Rome ΙΙΙ criteria. Diverticula were diagnosed by colonoscopy with a transparent soft-short hood. KEY RESULTS The study evaluated 1066 subjects, 648 males and 418 females (ratio, 1.55 : 1), of mean age 63.9 ± 13.0 years. After adjusting for age and sex, the presence of constipation was associated with a significantly reduced likelihood of diverticula (odds ratio [OR] = 0.70, 95% confidence interval [CI] 0.52-0.93). When assessed according to the location of diverticula, the presence of constipation was associated with a significantly decreased likelihood of left-sided (OR = 0.39, 95% CI 0.16-0.93), but not right-sided (OR = 1.10, 95% CI 0.48-2.53), diverticula. Furthermore, stool form was unrelated with the presence or absence of diverticula. CONCLUSIONS & INFERENCES The wide-spread hypothesis that constipation was associated with colonic diverticula was not supported. Rather, we found that the absence of diverticula was associated with constipation, suggesting the need to reassess the etiology of colonic diverticula.
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Affiliation(s)
- E Yamada
- Gastroenterology Division, Saiseikai Yokohama-shi Nanbu Hospital, Yokohama, Japan
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Fujisawa N, Darwish WS, Ikenaka Y, Kim E, Lee J, Iwata H, Nakayama S, Ishizuka M. Molecular evaluation of a new highly sensitive aryl hydrocarbon receptor in ostriches. Poult Sci 2013; 92:1921-9. [PMID: 23776281 DOI: 10.3382/ps.2013-03090] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A 1,000-fold difference has been reported in dioxin sensitivity between avian species. This difference is because the 2 amino acids in the type 1 aryl hydrocarbon receptor (AhR1), at positions 325 and 381, correspond to Leu324 and Ser380 in chickens. The chicken had been reported to be the only avian species to possess a sensitive form of AhR1. This is the first study to reveal that the ostrich (Struthio camelus), a nonchicken species, also has a pair of amino acids (Ile-325 and Ser-381) that show high ligand affinity. However, the alignment of the AhR1 cDNA sequence showed that the AhR sequence in the ostrich was different than that of other avian species even though the critical amino acids were observed at positions 325 and 381. Ostrich AhR1 was also evaluated in a heterologous expression study. Ostrich AhR1 showed very high transcriptional activity of the cytochrome P450 1A5 (CYP1A5) gene in African Green Monkey Cercopithecus aethiops kidney cells (COS-7) treated with Sudan III. In primary cultures of ostrich kidney cells, CYP1A5 expression was induced by Sudan III at a lower (or almost identical) concentration to that observed in the chicken. The present study revealed a new AhR ligand sensitive avian species (i.e., the ostrich).
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Affiliation(s)
- N Fujisawa
- Department of Environmental Veterinary Sciences, Hokkaido University, Sapporo, Japan
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15
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Ohkubo M, Nakagawa Y, Yamagata T, Fujisawa N. Quantitative visualization of temperature field in non-luminous flame by flame reaction technique. J Vis (Tokyo) 2011. [DOI: 10.1007/s12650-011-0109-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Sekino Y, Fujisawa N, Suzuki K, Akimoto K, Takahata A, Miharada K, Koyama S, Iida H, Endo H, Hosono K, Sakamoto Y, Takahashi H, Koide T, Tokoro C, Abe Y, Maeda S, Nakajima A, Tatsumoto A, Sakurada H, Inamori M. A case of recurrent infective endocarditis following colonoscopy. Endoscopy 2010; 42 Suppl 2:E217. [PMID: 20845280 DOI: 10.1055/s-0030-1255719] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Affiliation(s)
- Y Sekino
- Gastroenterology Division, Yokohama City University Hospital, Kanazawa-ku, Yokohama, Japan
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Syuto T, Fujisawa N, Takasugi T, Yamagata T. Flow visualization and scanning PIV measurement of three-dimensional structure in near field of strongly buoyant jet. J Vis (Tokyo) 2010. [DOI: 10.1007/s12650-010-0027-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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18
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Fujisawa N, Aiura S, Ohkubo M, Shimizu T. Temperature measurement of dilute hydrogen flame by digital laser-speckle technique. J Vis (Tokyo) 2009. [DOI: 10.1007/bf03181943] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Fujisawa N, Funatani S, Watanabe Y. Simultaneous imaging techniques for temperature and velocity fields in thermal fluid flows. J Vis (Tokyo) 2008. [DOI: 10.1007/bf03181713] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Suzuki K, Takahashi H, Fujisawa N, Sekino Y, Akimoto K, Tomimoto A, Saito K, Yoneda M, Inamori M, Abe Y, Kirikoshi H, Kobayashi N, Kubota K, Saito S, Koyama S, Nakajima A. Gastric ulcer following a thrombotic aneurysm of the splenic artery. Endoscopy 2008; 40 Suppl 2:E193-4. [PMID: 18709612 DOI: 10.1055/s-2008-1077418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Affiliation(s)
- K Suzuki
- Department of Gastroenterology, Tokyo Metropolitan Hiroo Hospital, Japan
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Tsuzawa K, Fujisawa N, Sekino Y, Suzuki K, Saito K, Koyama S, Tanaka M, Wada A, Inamori M, Kubota K, Nakajima A. Education and Imaging. Gastrointestinal: colonic spirochetosis. J Gastroenterol Hepatol 2008; 23:1160. [PMID: 18707602 DOI: 10.1111/j.1440-1746.2008.05493.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Affiliation(s)
- K Tsuzawa
- Department of Gastroenterology, Tokyo Metropolitan Hiroo Hospital, Tokyo, Japan
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Terayama R, Omura S, Fujisawa N, Yamaai T, Ichikawa H, Sugimoto T. Activation of microglia and p38 mitogen-activated protein kinase in the dorsal column nucleus contributes to tactile allodynia following peripheral nerve injury. Neuroscience 2008; 153:1245-55. [DOI: 10.1016/j.neuroscience.2008.03.041] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2007] [Revised: 03/14/2008] [Accepted: 03/15/2008] [Indexed: 01/23/2023]
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25
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Fujisawa N, Watanabe M, Hashizume Y. Visualization of turbulence structure in unsteady non-penetrative thermal convection using liquid crystal thermometry and stereo velocimetry. J Vis (Tokyo) 2008. [DOI: 10.1007/bf03181932] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Fujisawa N, Verhoeckx M, Dabiri D, Gharib M, Hertzberg J. Recent progress in flow visualization techniques toward the generation of fluid art. J Vis (Tokyo) 2007. [DOI: 10.1007/bf03181827] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Abe Y, Inamori M, Fujita K, Fujisawa T, Fujisawa N, Yoneda M, Takahashi H, Ikeda T, Hara K, Akiyama T, Kawamura H, Kato A, Kirikoshi H, Kobayashi N, Kubota K, Saito S, Sasaki T, Inayama Y, Ueno N, Nakajima A. Gastrointestinal: rectal polyp associated with schistosomiasis. J Gastroenterol Hepatol 2006; 21:1216. [PMID: 16824081 DOI: 10.1111/j.1440-1746.2006.04557.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Affiliation(s)
- Y Abe
- Division of Gastroenterology, Yokohama City University School of Medicine, Kanagawa, Japan
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Inamori M, Ueno N, Fujita K, Fujisawa T, Fujisawa N, Yoneda M, Takahashi H, Ikeda T, Kawamura H, Abe Y, Kato A, Kirikoshi H, Kobayashi N, Shimamura T, Kubota K, Saito S, Sakaguchi T, Yamanaka S, Inayama Y, Nakajima A. Education and imaging. Gastrointestinal: Gastrointestinal metastases from malignant melanoma. J Gastroenterol Hepatol 2006; 21:327. [PMID: 16460495 DOI: 10.1111/j.1440-1746.2006.04239.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Affiliation(s)
- M Inamori
- Gastroenterology Division and Department of Pathology, Yokohama City University, Kanagawa, Japan
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Fujisawa N, Ninomiya N. Interdisciplinary imaging science. J Vis (Tokyo) 2005. [DOI: 10.1007/bf03181644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Fujisawa N, Masuda T, Inaoka Y, Fukuoka H, Ishida A, Minamitani H. Human standing posture control system depending on adopted strategies. Med Biol Eng Comput 2005; 43:107-14. [PMID: 15742727 DOI: 10.1007/bf02345130] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Control of the standing posture of humans involves at least two distinct modes of operation to restore the body balance in the sagittal plane: the ankle strategy and the hip strategy. The objective of the study was to estimate the contribution of vestibular, visual and somatosensory feedbacks to these distinct strategies. The body dynamics was described as the motion of two linked rigid segments that represented the legs and the rest of the body. The posture controller received the inclination angles of the two body segments as inputs and regulated the moments around the ankle and hip joints. The controller had four feedback paths that were characterised by transfer functions connecting the two inputs and the two outputs. To evoke the distinct strategies, the floor conditions were varied by narrowing the support surface under the feet. A continuous pseudo-random external disturbing force was applied to the waist and the thigh independently. The inclination angles of the body segments and the ground reaction force were measured, and the transfer functions of the controller were estimated with the maximum-likelihood system identification procedure. Six healthy male adult subjects participated in the experiment. When the hip strategy became evident under the narrow support surface conditions, the transfer function relating the leg inclination angle and the ankle joint moment decreased its DC gain (16%), whereas the other three transfer functions increased the gains (20-140%) (ANOVA, p < 0.05). Based on a criterion for simplicity in the modification of the posture controller, these changes suggest a new hypothesis that, when posture control becomes difficult, the central nervous system selectively activates the somatosensory feedback paths from the hip joint angle to the moments around the ankle and hip joints.
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Affiliation(s)
- N Fujisawa
- Graduate School of Science & Technology, Keio University, Yokohama, Japan
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Nakajima S, Iwaki S, Fujisawa N, Yamaguchi S, Kawano M, Fujiki N, Naito Y, Honjo I. Speech discrimination in elderly cochlear implant users. Adv Otorhinolaryngol 2002; 57:368-9. [PMID: 11892191 DOI: 10.1159/000059213] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- S Nakajima
- Department of Hearing and Speech Science, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
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Miura K, Saito H, Fujisawa N, Wang D, Nishikori H, Hosomi A. Homolytic carbostannylation of alkenes and alkynes with tributylstannyl enolates. Org Lett 2001; 3:4055-7. [PMID: 11735583 DOI: 10.1021/ol016797w] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In the presence of AIBN, tributylstannyl enolates derived from aromatic ketones reacted with electron-deficient alkenes and a variety of alkynes to give the corresponding carbostannylated adducts. The reactions with methyl acrylate gave alpha-tributylstannylmethyl-gamma-ketoesters, unlike the known Michael-type reaction of stannyl enolates forming delta-ketoesters. The carbostannylation of alkynes proceeded in an anti addition mode to afford beta,gamma-unsaturated ketones. The reactivity of stannyl enolates as radical transfer agents could be utilized for radical cyclization of 1,6-enynes.
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Affiliation(s)
- K Miura
- Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
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Abstract
[reaction: see text] The radical-initiated beta-ketoalkylation of haloalkanes with tributylstannyl enolates is described. Stannyl enolates derived from aromatic ketones are reactive toward the homolytic beta-ketoalkylation of simple haloalkanes as well as those activated by an electron-withdrawing group. The reactivity of stannyl enolates as radical alkylating agents can be utilized for an efficient three-component coupling reaction among stannyl enolates, haloalkanes, and electron-deficient alkenes.
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Affiliation(s)
- K Miura
- Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
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Miura K, Saito H, Itoh D, Matsuda T, Fujisawa N, Wang D, Hosomi A. Allylstannylation of Carbon−Carbon and Carbon−Oxygen Unsaturated Bonds via a Radical Chain Process1. J Org Chem 2001; 66:3348-55. [PMID: 11348116 DOI: 10.1021/jo0057295] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In the presence of a radical initiator, allyltributylstannanes bearing an electron-withdrawing group at the beta-position smoothly reacted with electron-deficient terminal alkenes to give allylstannylated products in good yields. The stannyl group was introduced into the terminal carbon with high regioselectivity. The allylstannylation of homochiral 8-phenylmenthyl acrylate proceeded with moderate to good diastereoselectivity. Terminal and electron-deficient internal alkynes as well efficiently underwent the radical-initiated allylstannylation in an anti addition mode. The reaction of terminal alkynes showed the same regioselectivity as that of terminal alkenes. The present radical reaction was applicable to allylation of aromatic aldehydes and ketones.
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Affiliation(s)
- K Miura
- Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
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Abstract
This study examined the fluid dynamics of a textured blood-contacting surface using a computational fluid-dynamic modeling technique. The texture consisted of a regular array of microfibers of length 50 or 100 microm, spaced 100 microm apart, projecting perpendicularly to the surface. The results showed that the surface texture served as a flow-retarding solid boundary for a laminar viscous flow, resulting in a lowered wall shear stress on the hase-plane surface. However, the maximum wall shear stress on the fibers was much higher than the shear stress on the nontextured phase plane. At all fractions of fiber height down past 10 microm, the permeability of the textured region greatly exceeded the analytically predictable permeability of an equivalent array of infinite-height fihers. The lowered suiface shear stress appears to explain in part the enhanced deposition of formed blood elements on the textured surface.
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Affiliation(s)
- N Fujisawa
- Graduate School of Biomedical Engineering, University of New South Wales, Sydney, Australia
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Abstract
Textured blood-contacting surfaces can promote the formation of a blood-compatible pseudo-neointima. We hypothesized that by controlling the surface texturing, the pseudo-neointima thickness could be controlled. The hypothesis was tested experimentally by fabricating the polyurethane textured surfaces with three different fiber lengths, and exposing them simultaneously to the flowing blood in an ovine ex vivo carotid-jugular series shunt for periods up to 4 h. The textured surface consisted of regularly spaced tapered micro-fibers of defined length on a smooth base-plane surface. Because of the simple surface topography, detailed computational fluid-dynamic modeling of the surface could be obtained as a parallel study. Experimental results showed that white cell was the predominant cell type deposited on the textured surfaces, whereas macroscopic thrombus formation occurred only in one of nine blood-contacting experiments. White cell density on the textured base-plane surface was subsequently quantified by image-analyzing the electron micrographs of blood-contacted textured surfaces. The statistical analysis of cell densities on individual textured surfaces showed effects of wall shear stress on the textured base plane (which was obtained from the fluid-dynamic modeling), the longitudinal position of the test section in the series shunt, and blood-contact time.
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Affiliation(s)
- N Fujisawa
- Graduate School of Biomedical Engineering, University of New South Wales, Sydney 2052, Australia.
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Kurdowska A, Fujisawa N, Peterson B, Carr FK, Noble JM, Alden SM, Miller EJ, Teodorescu M. Specific binding of IL-8 to rabbit alpha-macroglobulin modulates IL-8 function in the lung. Inflamm Res 2000; 49:591-9. [PMID: 11131299 DOI: 10.1007/s000110050636] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Abstract
OBJECTIVE AND DESIGN The purpose of this study was to compare chemotactic activity of IL-8 alone with that of IL-8 reacted with rabbit alpha-macroglobulins (alphaM) in vivo. METHODS Initially the binding of recombinant human IL-8 (rhIL-8) to rabbit alphaM was studied. 125I-labeled rhIL-8 was incubated with alphaM, and electrophoresed on native 5% gels or SDS-polyacrylamide 4-20% gradient gels. Next, rhIL-8 or rhIL-8 bound to alphaM was administered via an endotracheal tube to rabbit's lungs. TREATMENT An endotracheal tube was wedged into a segment of the lobe of each lung, and a sample instilled through the tube into this segment. After 4 h the lungs were lavaged. RESULTS rhIL-8 bound to alphaM retained its full chemotactic activity in vitro but exhibited a diminished ability to induce the influx of neutrophils into the rabbit lung. CONCLUSIONS The data suggest that alphaM may facilitate IL-8 clearance from the lung.
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Affiliation(s)
- A Kurdowska
- Department of Biochemistry, University of Texas Health Center, Tyler 75708, USA.
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Fujisawa N, Sakao Y, Hayashi S, Hadden WA, Harmon CL, Miller EJ. alpha-Chemokine growth factors for adenocarcinomas; a synthetic peptide inhibitor for alpha-chemokines inhibits the growth of adenocarcinoma cell lines. J Cancer Res Clin Oncol 2000; 126:19-26. [PMID: 10641745 DOI: 10.1007/pl00008460] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
PURPOSE The experiments aimed to determine if alpha-chemokine inhibitors are effective suppressors of the growth of adenocarcinomas, a neoplasm with a high mortality rate. METHODS Expression of growth-related oncogene (GROalpha) and interleukin-8 (IL-8) was determined by enzyme-linked immunosorbent assay. Inhibition of alpha-chemokine binding to tumor cells was assessed in the presence and absence of the hexapeptide, antileukinate. 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assays were performed to determine the effect of alpha-chemokines, monoclonal antibodies (mAb), and antileukinate on cell proliferation. Finally, antileukinate inhibition of human, lung adenocarcinoma tumor growth, was determined in BALB/c nude mice. RESULTS All of the adenocarcinomas tested produced either GROalpha or IL-8 or both. Proliferation of lung, stomach and colon adenocarcinoma cells was inhibited by anti-GROalpha mAb and/or anti-IL-8 mAb while recombinant human GROalpha stimulated the proliferation of lung and stomach adenocarcinomas. Antileukinate inhibited GROalpha binding to specific receptors on adenocarcinoma cells and inhibited the proliferation of all adenocarcinomas tested. Colon-derived adenocarcinomas specifically bound IL-8 and this binding was also inhibited by antileukinate. Administration of antileukinate in vivo inhibited the tumor growth of adenocarcinoma A549. CONCLUSIONS GROalpha and IL-8 are necessary for the growth of lung, stomach and colon adenocarcinomas, and can be inhibited by the hexapeptide, antileukinate. The findings suggest the possibility of using alpha-chemokine receptor inhibitors in the treatment of adenocarcinoma.
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Affiliation(s)
- N Fujisawa
- The University of Texas Health Center at Tyler, 75708-3154, USA
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Fujisawa N, Adrian RJ. Three-dimensional temperature measurement in turbulent thermal convection by extended range scanning liquid crystal thermometry. J Vis (Tokyo) 1999. [DOI: 10.1007/bf03181425] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Abstract
Three cases of pustulotic arthro-osteitis (PAO) associated with episcleritis were described. In each patient, the episcleritis developed more than 10 years after the onset of PAO. These episcleritis were treated with topical corticosteroids. PAO is classified as a member of the seronegative spondylarthritis group of diseases. Though complications of seronegative spondylarthritis include uveitis and episcleritis. PAO associated with episcleritis was not reported. Episcleritis should be considered as a complication of PAO.
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Affiliation(s)
- S Ikegawa
- Division of Dermatology, Shinonoi General Hospital, Nagano City, Japan
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Abstract
The ancient Egyptians probably recognized cancerous lesions on the surface of the body. Hippocrates described cancers of the skin, larynx, breast, inguinal region, uterus, and vagina. For centuries, the treatments were excision, cauterization, ointment application, and fomentation. The development of anesthesia, antisepsis, and disinfection, and the discoveries of X-rays and radium in the nineteenth century, have greatly promoted advances in surgery in the twentieth century. At the beginning of this century, it became possible for surgeons to extirpate tumors from previously inaccessible body interiors, and today surgeons are able to remove affected organ systems and even entire regions of the body with safety because of advances in physiology, anesthesia, transfusion, and anti-infective agents. The surgical results for most gastrointestinal cancers have improved markedly in recent years, only with pancreatic cancer showing no improvement in results. Drastic extensive surgery has not led to better results. A small carcinoma less than 1 cm in diameter may not always be an early carcinoma. Early cancer in duct cell carcinoma may be one localized in the mucous membrane of the pancreatic duct. There is now an expectation that early diagnosis will be possible by using magnetic resonance cholangiopancreatography and cytological diagnosis of the pancreatic juice.
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Affiliation(s)
- R Tsuchiya
- Tagami Hospital, 2-14-15 Tagami, Nagasaki 851-0251, Japan
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Abstract
PURPOSE To describe a patient with multicentric Castleman disease who was initially examined with ophthalmic signs and symptoms. METHODS Case report. A 71-year-old man was initially examined with swelling of both upper eyelids and diplopia of 2 months' duration. RESULTS Medical evaluation and right axillary lymph node biopsy disclosed Castleman disease. Systemic corticosteroid treatment temporarily resolved signs and symptoms, but the patient died of recurrence with cytomegalovirus and Aspergillus infection 10 months after initial examination. CONCLUSIONS Multicentric Castleman disease is a rare but distinct disorder that may present initially with ocular signs and symptoms. This disease must be included in the differential diagnosis of orbital pseudotumor and lymphoma.
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Affiliation(s)
- T Kurokawa
- Department of Ophthalmology, Shinshu University School of Medicine, Matsumoto, Japan
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