Publications by authors named "Mie Matsuzawa"

3 Publications

  • Page 1 of 1

Environmental pH stress influences cellular secretion and uptake of extracellular vesicles.

FEBS Open Bio 2021 03 18;11(3):753-767. Epub 2021 Feb 18.

Keio University School of Medicine, Tsukuba, Japan.

Exosomes (extracellular vesicles/EVs) participate in cell-cell communication and contain bioactive molecules, such as microRNAs. However, the detailed characteristics of secreted EVs produced by cells grown under low pH conditions are still unknown. Here, we report that low pH in the cell culture medium significantly affected the secretion of EVs with increased protein content and zeta potential. The intracellular expression level and location of stably expressed GFP-fused CD63 (an EV tetraspanin) in HeLa cells were also significantly affected by environmental pH. In addition, increased cellular uptake of EVs was observed. Moreover, the uptake rate was influenced by the presence of serum in the cell culture medium. Our findings contribute to our understanding of the effect of environmental conditions on EV-based cell-cell communication.
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http://dx.doi.org/10.1002/2211-5463.13107DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7931216PMC
March 2021

A high performance photothermal film with spherical shell-type metallic nanocomposites for solar thermoelectric conversion.

Nanoscale 2015 May;7(17):7580-4

Nanoscience and Nanotechnology Research Center, Osaka Prefecture University, Sakai 599-8570, Japan.

A photothermal film (PTF) with densely assembled gold nanoparticle-fixed beads on a polymer substrate is fabricated. Remarkably, a temperature rise higher than 40 °C is achieved in the PTF with only 100 seconds of artificial solar irradiation, and the output power of the thermoelectric device was enhanced to be one order higher than that without PTF. These results will pioneer a rapid solar thermoelectric device.
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http://dx.doi.org/10.1039/c5nr00943jDOI Listing
May 2015

Room-temperature pressure-induced nanostructural CuInTe(2) thermoelectric material with low thermal conductivity.

Inorg Chem 2014 Jul 10;53(13):6844-9. Epub 2014 Jun 10.

Nanoscience and Nanotechnology Research Center, Research Organization for the 21st Century, Osaka Prefecture University , Gakuencho 1-2, Sakai 599-8570, Japan.

A room-temperature high-pressure synthesis method is proposed as an alternative way to induce nanoscale structural disorder in the bulk thermoelectric CuInTe2 matrix. This disorder stems from the coexistence of distinct domains with different degrees and geometries of disorder at Cu/In cation sites. The lattice thermal conductivity of high-pressure-treated CuInTe2 is substantially less than that of hot-pressed CuInTe2. The Debye-Callaway model reveals that the reduced lattice thermal conductivity is mainly attributed to disorder at the Cu/In cation sites and stacking faults, which were probably created during formation of the high-pressure-treated phases. This study demonstrates that room-temperature high-pressure synthesis can produce a radical change in the crystal structure and physical properties of conventional thermoelectric materials.
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http://dx.doi.org/10.1021/ic500688dDOI Listing
July 2014
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