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Articles by M Baba
Total Records ( 4 ) for M Baba
  A Fukumura , H Tsujii , T Kamada , M Baba , H Tsuji , H Kato , S Kato , S Yamada , S Yasuda , T Yanagi , R Hara , N Yamamoto , J Mizoe , K Akahane , S Fukuda , Y Furusawa , Y Iwata , T Kanai , N Kanematsu , A Kitagawa , N Matsufuji , S Minohara , N Miyahara , H Mizuno , T Murakami , K Nishizawa , K Noda , E Takada and S. Yonai
 

The features of relativistic carbon-ion beams are attractive from the viewpoint of radiotherapy. They exhibit not only a superior physical dose distribution but also an increase in biological efficiency with depth, because energy loss of the beams increases as they penetrate the body. This paper reviews clinical aspects of carbon-beam radiotherapy using the experience at the National Institute of Radiological Sciences. The paper also outlines the dosimetry related to carbon-beam radiotherapy, including absolute dosimetry of the carbon beam, neutron measurements and radiation protection measurements.

  S Muraoka , Y Ito , M Kamimura , M Baba , N Arima , Y Suda , S Hashiguchi , M Torikai , T Nakashima and K. Sugimura
 

By a biopanning method using cell sorter, we quickly isolated an antibody phage clone (S1T-A3) specific to human T-lymphotropic virus type 1-carrying T-cell line S1T from a human single chain Fv (scFv) antibody phage library. This scFv antibody bound to HTLV-1-carrying T-cell lines including MT-2, MT-4 and M8166 other than S1T, but not to non-HTLV-1-carrying T-cell lymphomas such as Jurkat and MOLT4 cells. Interestingly, this antibody induced the cell death on S1T cells very quickly (< 30 min). We tried to identify the target molecules by western blotting and mass spectrometric analysis, revealing that the target antigen was HLA class II DR. The cell death was induced only in dimmer form of scFv (diabody) and at 15-fold lower concentration than that of a fusion protein of scFv and human IgG Fc [(scFv)2-Fc] or anti HLA-DR mouse whole antibody L243. Thus, S1T-A3 diabody is a small antibody fragment with agonistic activity to induce cell death through HLA-DR. This is the first report elucidating that diabody specific to HLA-DR is effective to induce the cell death in T-cell malignancy especially adult T-cell leukaemic cell line.

  M Sato , Y Ito , N Arima , M Baba , M Sobel , M Wakao and Y. Suda
 

To analyse the binding of sugar chains to proteins, viruses and cells, the surface plasmon resonance (SPR) technique is very convenient and effective because it is a real-time, non-destructive detection system. Key to this method is linker compounds for immobilization of the sugar chains to the gold-coated chip for SPR. Also, well-designed fluorescent labelling reagents are essential when analysing the structure of trace amounts of sugar chains derived from natural sources, such as glycoproteins on the surface of specific cells. In this report, we developed a novel linker molecule, named ‘f-mono’, which has both of these properties: simple immobilization chemistry and a fluorescent label. Since the molecule contains a 2,5-diaminopyridyl group and a thioctic acid group, conjugation with sugar chains can be achieved using the well-established reductive amination reaction. This conjugate of sugar chain and fluorescent linker (fluorescent ligand-conjugate, FLC) has fluorescent properties (ex. 335 nm, em. 380 nm), and as little as 1 µg of FLC can be easily purified using HPLC with a fluorescent detector. MS and MS/MS analysis of the FLC is also possible. As a +2 Da larger MS peak ([M + H + 2]+ ion) was always associated with the theoretical MS peak ([M + H]+) (due to the reduction of the thioctic acid moiety), the MS peaks of the FLC were easily found, even using unfractionated crude samples. Immobilization of the FLC onto gold-coated chips, and their subsequent SPR analyses were successively accomplished, as had been performed previously using non-fluorescent ligand conjugates.

  W. L Yen , T Shintani , U Nair , Y Cao , B. C Richardson , Z Li , F. M Hughson , M Baba and D. J. Klionsky
 

COG subunits localize to the phagophore assembly site where they interact with autophagy proteins and are required for double-membrane Cvt vesicle and autophagosome formation.

 
 
 
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