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Articles by M Yoshida
Total Records ( 7 ) for M Yoshida
  S Nakano , M Yoshida , K Fujii , K Yorozuya , Y Mouri , J Kousaka , T Fukutomi , J Kimura , T Ishiguchi , K Ohno , T Mizumoto and M. Harao
  Objective

We recently developed a real-time virtual sonography (RVS) system that enables simultaneous display of both sonography and magnetic resonance imaging (MRI) cutaway images of the same site in real time. The aim of this study was to evaluate the role of RVS in the management of enhancing lesions visualized with MRI.

Methods

Between June 2006 and April 2007, 65 patients underwent MRI for staging of known breast cancer at our hospital. All patients were examined using mammography, sonography, MRI and RVS before surgical resection. Results were correlated with histopathologic findings. MRI was obtained on a 1.5 T imager, with the patient in the supine position using a flexible body surface coil. Detection rate was determined for index tumors and incidental enhancing lesions (IELs), with or without RVS.

Results

Overall sensitivity for detecting index tumors was 85% (55/65) for mammography, 91% (59/65) for sonography, 97% (63/65) for MRI and 98% (64/65) for RVS. Notably, in one instance in which the cancer was not seen on MRI, RVS detected it with the supplementation of sonography. IELs were found in 26% (17/65) of the patients. Of 23 IELs that were detected by MRI, 30% (7/23) of IELs could be identified on repeated sonography alone, but 83% (19/23) of them were identified using the RVS system (P = 0.001). The RVS system was able to correctly project enhanced MRI information onto a body surface, as we checked sonography form images.

Conclusions

Our results suggest that the RVS system can identify enhancing breast lesions with excellent accuracy.

  M Danbara , M Yoshida , Y Kanoh , S. X Jiang , N Masuda , T Akahoshi and M. Higashihara
 

A lot of hematologists are often faced with the difficulty of diagnosing bone marrow micrometastasis of carcinoma cells. We employed a new flow cytometric immunophenotyping by a combination of CD45 with three neuroendocrine markers: CD56, microtubule-associated protein-2 and synaptophysin, and successfully detected micrometastatic tumor cells in the bone marrow of a 61-year-old male patient with small cell lung cancer (SCLC), whose marrow smears never showed a distinct morphology of metastasis. It was noteworthy that these SCLC cells accompanied the aberrant expression of CD45, leukocyte common antigen known as a specific marker for hematolymphoid neoplasms, which was not detected in the tumor of primary lesion. We describe this rare case to arouse an attention that tumors of non-hematolymphoid origin can exhibit exceptional CD45-positvity in metastatic sites.

  K Shitara , T Yokota , D Takahari , T Shibata , T Ura , Y Komatsu , S Yuki , M Yoshida , H Takiuchi , S Utsunomiya , Y Yatabe and K. Muro
 

Standard weekly cetuximab and irinotecan is an effective regimen in heavily pre-treated patients with metastatic colorectal cancer. The aim of this study is to prospectively evaluate the efficacy of combination chemotherapy with biweekly cetuximab and irinotecan in patients with pre-treated metastatic colorectal cancer harboring wild-type KRAS. A total of 30 patients will be enrolled at four medical institutions. The primary endpoint is response rate. The secondary endpoints include adverse events, progression-free survival and overall survival. The pharmacokinetics of cetuximab will also be evaluated in five patients.

  K Baba , Y. W Park , T Kaku , R Kaida , M Takeuchi , M Yoshida , Y Hosoo , Y Ojio , T Okuyama , T Taniguchi , Y Ohmiya , T Kondo , Z Shani , O Shoseyov , T Awano , S Serada , N Norioka , S Norioka and T. Hayashi
 

In response to environmental variation, angiosperm trees bend their stems by forming tension wood, which consists of a cellulose-rich G (gelatinous)-layer in the walls of fiber cells and generates abnormal tensile stress in the secondary xylem. We produced transgenic poplar plants overexpressing several endoglycanases to reduce each specific polysaccharide in the cell wall, as the secondary xylem consists of primary and secondary wall layers. When placed horizontally, the basal regions of stems of transgenic poplars overexpressing xyloglucanase alone could not bend upward due to low strain in the tension side of the xylem. In the wild-type plants, xyloglucan was found in the inner surface of G-layers during multiple layering. In situ xyloglucan endotransglucosylase (XET) activity showed that the incorporation of whole xyloglucan, potentially for wall tightening, began at the inner surface layers S1 and S2 and was retained throughout G-layer development, while the incorporation of xyloglucan heptasaccharide (XXXG) for wall loosening occurred in the primary wall of the expanding zone. We propose that the xyloglucan network is reinforced by XET to form a further connection between wall-bound and secreted xyloglucans in order to withstand the tensile stress created within the cellulose G-layer microfibrils.

  T Sawada , P. B Francisco , S Aihara , Y Utsumi , M Yoshida , Y Oyama , M Tsuzuki , H Satoh and Y. Nakamura
 

In monocots, starch branching enzyme II (BEII) was functionally differentiated into BEIIa and BEIIb after separation from the dicots, and in cereals BEIIb plays a distinct role in amylopectin biosynthesis in the endosperm. The present study was conducted to examine to what extent a green algal BEII has an overlapping function with BEIIb in starch biosynthesis by introducing the Chlorella BEII gene into an amylose-extender (ae) mutant of rice. Chlorella BEII was found to complement the contribution of the rice endosperm BEIIb to the structures of amylopectin and starch granules because these mutated phenotypes were recovered almost completely to those of the wild type by the expression of Chlorella BEII. When the recombinant BE enzymes were incubated with the rice ae amylopectin, the branching pattern of Chlorella BEII was much more similar to that of rice BEIIb rather than rice BEIIa. Detailed analyses of BE reaction products suggests that BEIIb and Chlorella BEII only transfer chains with a degree of polymerization (DP) of 6 and 7, whereas BEIIa preferably transfers short chains with a DP of about 6–11. These results show that the Chlorella BEII is functionally similar to rice BEIIb rather than BEIIa.

  T Igawa , H Tsunoda , Y Kikuchi , M Yoshida , M Tanaka , A Koga , Y Sekimori , T Orita , Y Aso , K Hattori and M. Tsuchiya
 

Thrombopoietin receptor agonist humanized VB22B single-chain diabody (hVB22B (scFv)2) was found to be expressed as a mixture of two conformational isomers, a single-chain diabody form and a bivalent scFv form, which had different VH/VL (variable region of the heavy chain/light chain) association patterns. The single-chain diabody form showed significantly higher biological activity than the bivalent scFv form and, when incubated at elevated temperatures, exhibited novel isomerization to the inactive bivalent scFv form. Therefore, therapeutic development of hVB22B (scFv)2 would require separation of the purified single-chain diabody form from the mixture of the two conformational isomers and also inhibition of isomerization into an inactive bivalent scFv form during storage. Novel VH/VL interface engineering in hVB22 (scFv)2, in which hydrogen bonding between H39 and L38 was substituted with electrostatic interaction to enhance the desired VH/VL association and inhibit the undesired VH/VL association, enabled selective expression of the desired conformational isomer without any reduction in biological activity or thermal stability. Moreover, VH/VL interface-engineered hVB22 (scFv)2 was completely resistant to isomerization. Because the hydrogen bonding interaction between H39 and L38 and the surrounding residues are highly conserved in human antibody sequences, VH/VL interface engineering could be generally applied to various (scFv)2 molecules for selective expression and inhibition of the isomerization of conformational isomers.

 
 
 
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