著者

Misaki HATA Masato SUZUKI Tomoyuki YASUKAWA

出版者

The Japan Society for Analytical Chemistry

雑誌

Analytical Sciences (ISSN:09106340)

巻号頁・発行日

vol.37, no.6, pp.803-806, 2021-06-10 (Released:2021-06-10)

参考文献数

32

被引用文献数

5

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We proposed selective manipulation techniques for retrieving and retaining target cells arrayed in microwells based on dielectrophoresis (DEP). The upper substrate with microband electrodes was mounted on the lower substrate with microwells based on the same design of microband electrodes by 90 degree relative to the lower substrate. A repulsive force of negative dielectrophoresis (n-DEP) was employed to retrieve the target cells from the microwell array selectively. Furthermore, the target cells were retained in the microwells after other cells were removed by n-DEP. Thus, the system described in this study could make it possible to retrieve and recover single target cells from a microwell array after determining the function of cells trapped in each microwell.

著者

Rino TAKEUCHI Masato SUZUKI Tomoyuki YASUKAWA

出版者

The Japan Society for Analytical Chemistry

雑誌

Analytical Sciences (ISSN:09106340)

巻号頁・発行日

vol.37, no.2, pp.229-232, 2021-02-10 (Released:2021-02-10)

参考文献数

25

被引用文献数

2

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The electrorotation (ROT) rates of K562 cells accompanied by erythroid differentiation were estimated to identify the differentiation status by using a novel electrorotation device with a microwell arranged on polynomial electrodes. Successive estimations of individual cells were achieved by sequential manipulations which involve trapping of the cell by positive dielectrophoresis (DEP), rotating by ROT, and removing by negative DEP. The ROT rate increased with the differentiation of K562 cells, because the cytoplasm conductivity would increase with an increase of the concentration of iron ions to produce hemoglobin. The ROT rate could be utilized to estimate the stage of cell differentiation without labeling.

著者

Tomoyuki YASUKAWA Asa MORISHIMA Masato SUZUKI Junya YOSHIOKA Keitaro YOSHIMOTO Fumio MIZUTANI

出版者

The Japan Society for Analytical Chemistry

雑誌

Analytical Sciences (ISSN:09106340)

巻号頁・発行日

vol.35, no.8, pp.895-901, 2019-08-10 (Released:2019-08-10)

参考文献数

39

被引用文献数

2 7

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We applied a fabrication method for the formation of island organization of cells based on a three-dimensional (3D) device for negative dielectrophoresis (n-DEP) to produce cell aggregates with uniform numbers of cells rapidly and simply. The intersections formed by rotating the interdigitated array (IDA) with two combs of band electrodes on the upper substrate by 90° relative to the IDA with two combs on the lower substrate were prepared in the device. The AC voltage was applied to a comb on the upper substrate and a comb on the lower substrate, while AC voltage with opposite phase was applied to another comb on the upper substrate and another comb on the lower substrate. Cells dispersed randomly were directed toward the intersections with relatively lower electric fields due to n-DEP, which formed by AC voltage applied bands with the identical phase, resulting in the formation of island patterns of cells. The cells accumulated at intersections were promoted to form the cell aggregates due to the close contact together. The production of cell aggregations adhered together was easily found by the dispersion behavior after switching the applied frequency to convert the cellular pattern. When cells were accumulated at the intersections by n-DEP for 45 min, almost accumulations of cells were adhered together, and hence a formations of cell aggregations. By using the present method, we can rapidly and simply fabricate cell aggregations with a uniform number of cells.

著者

Masato Suzuki

出版者

The Japanese Society of Physical Fitness and Sports Medicine

雑誌

The Journal of Physical Fitness and Sports Medicine (ISSN:21868131)

巻号頁・発行日

vol.4, no.1, pp.17-29, 2015-03-25 (Released:2015-03-23)

参考文献数

51

被引用文献数

1 8

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The kidneys play an important role in regulating acid-base and water-electrolyte balance disturbances induced by exercise. In sports medicine, research on renal function during exercise in healthy individuals and athletes is less common than other areas of study such as the respiratory, circulatory, and neuromuscular systems as well as metabolism, since renal function has no direct effect on athletic performance. In this study, we reviewed previous research results obtained in our laboratory and other studies as follows: 1) effects of exercise intensity on renal plasma flow and glomerular filtration rate; 2) effects of exercise intensity on plasma hormone responses and urinary excretion of water and electrolytes; 3) effects of aging on renal function following exhaustive exercise; 4) mechanisms underlying exercise-induced diuresis in healthy volunteers; 5) mechanisms underlying exercise-induced proteinuria (EIP) in healthy volunteers; and 6) effects of exercise combined with angiotensin-converting enzyme (ACE) inhibitor (ACE-I) on the progression of diabetic nephropathy (DN) in obese diabetic model rats. The number of obese diabetes patients is increasing in advanced countries, and the number of hemodialysis (HD) patients per capita in Japan is the highest worldwide. Approximately 42% of patients with DN undergo HD treatment every year. However, regular exercise has not been positively recommended for patients with nephropathy despite being an essential clinical approach for patients with diabetes. Moreover, the ideal exercise regimen for patients with diabetes complicated by nephropathy has not been investigated much. Therefore, a future study should investigate exercise therapy for patients with DN.

著者

Ryohei Yamakado Shinri Sugimoto Shin-ichi Matsuoka Masato Suzuki Yasuhiro Funahashi Koji Takagi

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.41, no.3, pp.249-251, 2012-03-05 (Released:2012-02-25)

参考文献数

18

被引用文献数

9

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m-Calix[3]amide having pyridine on the benzene ring (PyC3A) was synthesized by the cyclization of methyl 3-nonylamino-5-(pyridin-4-yl)benzoate using lithium 1,1,1,3,3,3-hexamethyldisilazide (LiHMDS). The molecular cage 3Pd·2PyC3A was prepared from a 2:3 mixture of PyC3A and [Pd(dppp)(OTf)2] in CDCl3/CD3OD (5/1 in volume). On the other hand, in CDCl3, the formation of a polymeric mixture was confirmed.