1
|
Kobatake S, Yamashita I. Photoinduced phase transition between polymorphic crystals of a photochromic diarylethene. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308081208] [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: 11/10/2022] Open
|
2
|
Nishi H, Kobatake S. Reactivity and optical property of diarylethene–gold nanoparticle complex in the film. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308082044] [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: 11/10/2022] Open
|
3
|
Nishizawa N, Furukawa D, Kobatake S, Matsumoto A. Change in the molecular structure of muconic esters during photoisomerization in the solid state. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308085851] [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: 11/10/2022] Open
|
4
|
Fujiwara H, Kobatake S. X-ray crystallographic analysis of by-products produced in photochromism of dithienylcyclopentenes. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308082536] [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: 11/10/2022] Open
|
5
|
Masuda M, Morimoto T, Kobatake S, Nishimura N, Nakamoto K, Dong XH, Komiyama Y, Ogawa R, Takahashi H. Measurement of soluble Fcgamma receptor type IIIa derived from macrophages in plasma: increase in patients with rheumatoid arthritis. Clin Exp Immunol 2003; 132:477-84. [PMID: 12780696 PMCID: PMC1808718 DOI: 10.1046/j.1365-2249.2003.02168.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [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: 11/20/2022] Open
Abstract
FcgammaRIII (CD16) is found in two alternative forms, a transmembrane FcgammaRIIIa expressed on NK cells and macrophages, and a glycosylphosphatidylinositol-linked FcgammaRIIIb present on neutrophils. Previously, we measured soluble FcgammaRIIIa (sFcgammaRIIIa) in plasma of NA(1 +, 2-) phenotyped donors with the anti-FcgammaRIII monoclonal antibody (MoAb) GRM1, which recognizes NA2-FcgammaRIIIb and FcgammaRIIIa. The level of sFcgammaRIIIa, as well as the total sFcgammaRIII (sFcgammaRIIIa plus sFcgammaRIIIb) in patients with rheumatoid arthritis (RA) was significantly higher than that in healthy controls. In this study, we measured sFcgammaRIIIa(M)(phi) in plasma with a newly developed anti-FcgammaRIII MoAb, MKGR14 (mIgM), which recognizes FcgammaRIIIa(M)(phi) specifically. From the recovery of purified sFcgammaRIIIa(M)(phi), the amount of sFcgammaRIIIa(M)(phi) present was about half that of sFcgammaRIIIa(NK), and that of sFcgammaRIIIa was about 50 times lower than that of sFcgammaRIIIb in pooled plasma from healthy NA(1 +, 2-) phenotyped donors. The level of sFcgammaRIIIa(M)(phi) in RA patients was about four times higher than that in healthy controls. In RA patients, both the sFcgammaRIIIa(M)(phi) and sFcgammaRIIIa levels were increased as proportionally as the Lansbury Index. The sFcgammaRIIIa, but not sFcgammaRIIIa(M)(phi) levels, were increased directly proportional to C-reactive protein. sFcgammaRIIIa(M)(phi) may be a novel marker of disease activity in RA.
Collapse
Affiliation(s)
- M Masuda
- Department of Clinical Sciences and Laboratory Medicine, Kansai Medical University, Moriguchi, Osaka, Japan.
| | | | | | | | | | | | | | | | | |
Collapse
|
6
|
Yamada T, Muto K, Kobatake S, Irie M. Crystal structure-reactivity correlation in single-crystalline photochromism of 1,2-bis(2-methyl-5-phenyl-3-thienyl)perfluorocyclopentene. J Org Chem 2001; 66:6164-8. [PMID: 11529746 DOI: 10.1021/jo010117l] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Single-crystalline photochromism of 1,2-bis(2-methyl-5-phenyl-3-thienyl)perfluorocyclopentene 1a was followed in situ by X-ray crystallographic analysis. The crystal of 1a has two molecules with different conformations in the crystallographic asymmetric unit. The X-ray analysis of the photoirradiated crystal showed that the photocyclization reaction of the molecule with the shorter distance between the reactive carbons prevails over the reaction of the other molecule. The mechanism has been discussed based on the calculation of the electronic transitions of the two molecules in the different conformations. The photocyclization quantum yield was determined to be 1 (100%) in the crystal.
Collapse
Affiliation(s)
- T Yamada
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University and CREST, Japan Science and Technology Corporation, Higashi-ku, Fukuoka, 812-8581, Japan
| | | | | | | |
Collapse
|
7
|
Abstract
Dithienylethene-bridged diporphyrins 1-6 were prepared as photochemical switching molecules. Porphyrin and dithienylethene are directly linked in 1, and linked, respectively, through a 1,4-phenylene spacer in 2, through a 4-ethynylphenylene spacer in 3, and through a di-4-phenylethynylene spacer in 4, while meso-ethynylated porphyrin and dithienylethene are directly connected in 5 and linked through a 1,4-phenylene spacer in 6. Compounds 1, 2, and 5 do not undergo any photochemical isomerization, probably due to efficient quenching of the excited dithienylethene by the attached porphyrin moiety via intramolecular energy transfer. Compounds 4 and 6 undergo open-to-closed and closed-to-open photoisomerizations in quantum yields of 4.3 x 10(-)(2) and 1.8 x 10(-)(3), and 2.6 x 10(-)(3) and 7.5 x 10(-)(4), respectively, by irradiation with 313 and 625 nm light, which are considerably smaller than quantum yields of 0.52 and 3.8 x 10(-)(3) for reference dithienylethene molecule 7. The fluorescence of 4 was regulated in a reversible manner by the photoisomerization of the dithienylethene moiety. In addition, the absorption properties of the porphyrin in 6 changed in response to the photochromic reaction of the dithienylethene bridge.
Collapse
Affiliation(s)
- A Osuka
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | | | | | | | | |
Collapse
|
8
|
Abstract
The surface morphology of a diarylethene single crystal [1,2-bis(2,4-dimethyl-5-phenyl-3-thienyl)perfluorocyclopentene] determined by atomic force microscopy changed reversibly upon photoirradiation. The crystal underwent a thermally irreversible but photochemically reversible color change (colorless to blue) upon alternate irradiation with ultraviolet (wavelength lambda = 366 nm) and visible (lambda > 500 nm) light that drove reversible photocyclization reactions. Upon irradiation with 366-nm light, new steps appeared on the (100) single-crystalline surface that disappeared upon irradiation with visible light (lambda > 500 nm). The step height, about 1 nm, corresponds to one molecular layer. Irradiation with 366-nm light formed valleys on the (010) surface that also disappeared by bleaching upon irradiation with visible light (lambda > 500 nm). The surface morphological changes can be explained by the molecular structural changes of diarylethenes regularly packed in the single crystal. These crystals could potentially be used as photodriven nanometer-scale actuators.
Collapse
Affiliation(s)
- M Irie
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, and CREST, Japan Science and Technology Corporation, Hakozaki 6-10-1, Higashi-ku, Fukuoka 812-8581, Japan. mail:
| | | | | |
Collapse
|
9
|
|
10
|
Yoshikubo S, Kimura K, Mizuashi K, Kamo S, Maeda K, Kobatake S. [A case of chorea-like movement induced during interferon treatment of chronic hepatitis C]. Nihon Naika Gakkai Zasshi 1997; 86:1036-8. [PMID: 9340345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
|
11
|
Komiyama Y, Nishikado H, Masuda M, Egawa H, Kobayashi N, Kobatake S, Matsuura S, Murata K. A rapid enzyme-linked immunosorbent assay for human factor XI. Thromb Res 1988; 50:329-34. [PMID: 3394118 DOI: 10.1016/0049-3848(88)90234-4] [Citation(s) in RCA: 7] [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: 01/05/2023]
Affiliation(s)
- Y Komiyama
- Department of Clinico-laboratory Medicine, Kansai Medical University, Osaka, Japan
| | | | | | | | | | | | | | | |
Collapse
|
12
|
Suemura M, Ishizaka A, Kobatake S, Sugimura K, Maeda K, Nakanishi K, Kishimoto S, Yamamura Y, Kishimoto T. Inhibition of IgE production in B hybridomas by IgE class-specific suppressor factor from T hybridomas. The Journal of Immunology 1983. [DOI: 10.4049/jimmunol.130.3.1056] [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] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
The function of IgE class-specific suppressor factor (IgE-TsF) from T hybridomas was studied by employing IgE-producing B hybridomas. IgE-TsF was obtained from IgE class-specific T hybridomas, which had been established by the fusion of a phosphorylcholine-conjugated Mycobacterium-primed T cell population with the T lymphoma cell line BW5147. The absorption experiments showed that IgE-TsF from T hybridomas was composed of the binding site(s) for IgE and I region gene products as observed in conventional IgE-TsF. Incubation of IgE-producing B hybridomas with IgE-TsF for 1 hr at 37 degrees C resulted in the reduction of the number of IgE-secreting cells when assessed by a reverse plaque assay. The proportions of surface IgE-positive cells were concomitantly reduced. After 24 hr incubation with IgE-TsF, the number of cytoplasmic IgE-positive cells was reduced, showing that IgE synthesis was inhibited by IgE-TsF. Antigen-specific TsF from phosphorylcholine-specific T hybridomas did not show any inhibitory effect, and IgE-TsF did not block the antibody production of IgM-producing B hybridomas. Precapping of IgE receptors by anti-epsilon antibody or the simultaneous addition of soluble IgE with IgE-TsF abrogated the suppressive function, suggesting that IgE-TsF acted directly on B epsilon cells through binding with IgE receptors.
Collapse
|
13
|
Suemura M, Ishizaka A, Kobatake S, Sugimura K, Maeda K, Nakanishi K, Kishimoto S, Yamamura Y, Kishimoto T. Inhibition of IgE production in B hybridomas by IgE class-specific suppressor factor from T hybridomas. J Immunol 1983; 130:1056-60. [PMID: 6218197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The function of IgE class-specific suppressor factor (IgE-TsF) from T hybridomas was studied by employing IgE-producing B hybridomas. IgE-TsF was obtained from IgE class-specific T hybridomas, which had been established by the fusion of a phosphorylcholine-conjugated Mycobacterium-primed T cell population with the T lymphoma cell line BW5147. The absorption experiments showed that IgE-TsF from T hybridomas was composed of the binding site(s) for IgE and I region gene products as observed in conventional IgE-TsF. Incubation of IgE-producing B hybridomas with IgE-TsF for 1 hr at 37 degrees C resulted in the reduction of the number of IgE-secreting cells when assessed by a reverse plaque assay. The proportions of surface IgE-positive cells were concomitantly reduced. After 24 hr incubation with IgE-TsF, the number of cytoplasmic IgE-positive cells was reduced, showing that IgE synthesis was inhibited by IgE-TsF. Antigen-specific TsF from phosphorylcholine-specific T hybridomas did not show any inhibitory effect, and IgE-TsF did not block the antibody production of IgM-producing B hybridomas. Precapping of IgE receptors by anti-epsilon antibody or the simultaneous addition of soluble IgE with IgE-TsF abrogated the suppressive function, suggesting that IgE-TsF acted directly on B epsilon cells through binding with IgE receptors.
Collapse
|
14
|
Suemura M, Sugimura K, Ishizaka A, Kobatake S, Shiho O, Deguchi H, Kishimoto S, Yamamura Y, Kishimoto T. Regulation of the IgE response by IgE class-specific suppressor T hybridomas. Curr Top Microbiol Immunol 1982; 100:79-88. [PMID: 6212197 DOI: 10.1007/978-3-642-68586-6_9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
|