Papers - Fujimoto, Keiji

細胞接着性を有するミクロスフェアの作製とその評価

粕谷裕司、宮本正樹、清水一弘、藤本啓二、 大高　章、船越　奨、藤井信孝、川口春馬

高分子論文集 vol.50   417-423 1993

Research paper (conference, symposium, etc.), Joint Work

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アルギニン・グリシン・アスパラギン酸・セリンからなるテトラペプチドは細胞接着活性を有する。このテトラペプチドを合成し、反応性基を有する微粒子に結合させた。

Changes in platelet metabolism in contact with hydrophilic copolymer surfaces

Yui,N., Suzuki,K., Okano,T., Sakurai,Y., Ishikawa,C., Fujimoto,K., and Kawaguchi,H.

Heart Replacement Artificial Heart 4, Akutsu,T. and Koyanagi,H., Eds. Springer-Verlag, Tokyo    33-36 1993

Joint Work, Accepted

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親水性の微粒子および高分子鎖が血小板の代謝に与える影響について検討を行った。

Electrophoretic mobility of latex particles covered with temperature-sensitive hydrogel layers

Ohshima,H., Makino,K., Kato,T., Fujimoto,K., Kondo,T., and Kawaguchi,H.

Journal of Colloid and Interface Science (Journal of Colloid And Interface Science)  vol.159 ( 2 ) 512-514 - 514 1993

Research paper (scientific journal), Joint Work, Accepted,  ISSN  00219797

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感温性のヘアを表面に有する微粒子の泳動挙動を測定し、ヘア層の状態を柔らかさの観点からとらえる試みを行った。

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Mechanism of cytoplasmic calcium changes in platelets in contact with polystyrene and poly(acrylamide-co-methacrylic acid) surfaces

Yui,N., Suzuki,K., Okada,T., Sakurai,Y., Ishikawa,C., Fujimoto,K., and Kawaguchi,H.

Journal of Biomaterials Science, Polym. Ed. (Journal of Biomaterials Science, Polymer Edition)  vol.4 ( 3 ) 199-215 - 215 1993

Research paper (scientific journal), Joint Work, Accepted,  ISSN  09205063

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ポリスチレンの表面およびアクリルアミドとアクリル酸の共重合体表面が血小板に与える影響をその代謝機能変化から検出し、ポリマー鎖の動的な状態が重要な因子であることがわかった。

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ハイドロゲル粒子のラテックス診断薬担体としての応用

赤澤太朗、藤本啓二、川口春馬

高分子論文集 vol.50   431-435 1993

Research paper (conference, symposium, etc.), Joint Work

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診断の感度を低下させるものに、担体への種々の成分の非特異的な吸着があげられる。ハイドロゲルは超親水性であり吸着量を低く抑えることができる。このゲル微粒子を診断薬担体として用いたところ、特異的な成分だけを検出することに優れていることがわかった。

Application of Hydrogel Microspheres to Latex Diagnosis

Akazawa T., Fujimoto K., Kawaguchi H.

Kobunshi Ronbunshu (Kobunshi Ronbunshu)  50 ( 5 ) 431 - 435 1993

Research paper (scientific journal), Accepted,  ISSN  03862186

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Acrylamide, glycidyl methacrylate, and methylene bisacrylamide were copolymerized in an aqueous ethanol to form monodisperse hydrogel latex particles. Antibody of C-reactive protein (CRP) was immobilized on the particles through a hydrophilic spacer. The resulting particles were moderately stable, and the agglutination was proportional to the concentration of CRP. They were little susceptible to the nonspecific adsorption of proteins and the aggregation by rheumatoid factor. Therefore, it was concluded that the hydrogel particles are a promising carrier of antibodies for latex diagnosis. © 1993, The Society of Polymer Science, Japan. All rights reserved.

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Preparation and Evaluation of Polymer Microspheres with Cell Adhesion Activity

Kasuya Y., Shimizu K., Fujimoto K., Kawaguchi H., Miyamoto M., Otaka A., Funakoshi S., Fujii N.

Kobunshi Ronbunshu (Kobunshi Ronbunshu)  50 ( 5 ) 417 - 423 1993

Research paper (scientific journal), Accepted,  ISSN  03862186

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Microspheres having cell adhesion activity were prepared by immobilizing a tetrapeptide Arg-Gly-Asp-Ser (RGDS) onto the surface. Phagocytosis of the microspheres by leukocytes was not enhanced by immobilizing RGDS, but specific oxygen consumption was observed during the incubation of the RGDS-carrying microspheres with leukocytes. This was enhanced by a spacer introduced between RGDS and the microsphere. These results suggested that the immobilized RGDS could transduce the adhesion signal, resulting in the activation of leukocytes without enhancing phagocytosis of the microspheres. Furthermore, it was found that soluble RGDS did not induce oxygen consumption at all by itself. This result suggests that RGDS must be immobilized on solid carriers for the specific activation of leukocytes. Preparation and Evaluation of Polymer Microspheres with Cell Adhesion Activity. © 1993, The Society of Polymer Science, Japan. All rights reserved.

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Hydrogel microspheres III. Temperature-dependent adsorption of proteins on poly-N-isopropylacrylamide hydrogel microspheres

Kawaguchi H., Fujimoto K., Mizuhara Y.

Colloid & Polymer Science (Colloid & Polymer Science)  270 ( 1 ) 53 - 57 1992.01

Research paper (scientific journal), Accepted,  ISSN  0303402X

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Precipitation polymerization of N-isopropylacrylamide (NIPAM) with methylenebisacrylamide (MBAAm) in water at 70°C gave thermosensitive hydrogel microspheres. The adsorbability of proteins on the poly-NIPAM microspheres was found to depend on temperature. Below the lower critical solution temperature (LCST) of poly-NIPAM in an aqueous medium, that is, around 32°C, the microspheres hold a large amount of water inside and their surface is hydrophilic enough to suppress the adsorption of proteins. On the contrary, above 32°C, the micropheres deswell and their surface becomes hydrophobic and, consequently, susceptible to adsorption of a large amount of proteins. Proteins once adsorbed on the microspheres at a high temperature could be desorbed more or less by lowering the temperature to below 32°C. The extent of desorption at low temperatures was found to depend on the incubation time for adsorption at high temperatures. © 1992 Steinkopff-Verlag.

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Improvement in the mechanical properties of artificial blood vessel suitable for the extracranial cerebral artery

Miyamoto,S., Kikuchi,H., Ikada,Y., Minato,M., Fujimoto,K., Okada,M., Sakai,K., Nagata,I., Yamagata,S., Kaneko,T., and Kubo,H.

Neurological Surgery, (Neurological Surgery)  vol.18 ( 3 ) 253-258 - 258 1990

Research paper (scientific journal), Joint Work, Accepted,  ISSN  03012603

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ポリウレタンからなる人工血管を用いて埋植実験を行い、その機械的性質が重要である結果を得た。

Blood compatibility of polyurethane modified by surface graft polymerization

Fujimoto K., Tadokoro H., Minato M., Ikada Y.

Polymeric Materials Science and Engineering, Proceedings of the ACS Division of Polymeric Materials Science and Engineering (Polymeric Materials Science and Engineering, Proceedings of the ACS Division of Polymeric Materials Science and Engineering)  62   736 - 740 1990

Research paper (scientific journal), Accepted,  ISSN  07430515

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The purpose of this work is to modify PU by surface graft polymerization of acrylic monomers so as to reduce protein adsorption and platelet adhesion. It is shown that there is an optimum in the graft amount which leads to the minimum protein adsorption and thrombus formation.

Comparison between plasma- and ozone-induced graft polymerization

Fujimoto K., Ueda Y., Takebayashi Y., Ikada Y.

Polymeric Materials Science and Engineering, Proceedings of the ACS Division of Polymeric Materials Science and Engineering (Polymeric Materials Science and Engineering, Proceedings of the ACS Division of Polymeric Materials Science and Engineering)  62   284 - 288 1990

Research paper (scientific journal), Accepted,  ISSN  07430515

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This paper describes the results of plasma- and ozone-induced graft polymerization of acrylamides, together with the amount of peroxides formed by the plasma treatment and the ozonization. It is concluded that both the treatments of polymer surfaces by plasma and ozone produce polymeric peroxides which are capable of initiating graft polymerization, even if the treatments are conducted under a mild condition. An advantage of the ozonization over the plasma treatment is easy and uniform introduction of peroxides on the surface of molded products even with complicated shapes.

New veno-venous bypass without systemic anticoagulation in canine liver transplantation

Kim,K.S., Ueda,J., Asonuma,K., Zaima,M.,Tanaka,K., Ozawa,K., Minato,M.,Fujimoto,K., and Ikada,Y.

Surgery Research Communication vol.6   287-298 1989

Joint Work, Accepted

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全身的な抗凝血剤処置を行わずに肝臓移植を行うための、新規の静脈-静脈バイパス技術を開発した。