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      Features of Microsystems for Cultivation and Characterization of Stem Cells with the Aim of Regenerative Therapy

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          Abstract

          Stem cells have infinite potential for regenerative therapy thanks to their advantageous ability which is differentiable to requisite cell types for recovery and self-renewal. The microsystem has been proved to be more helpful to stem cell studies compared to the traditional methods, relying on its advantageous feature of mimicking in vivo cellular environments as well as other profitable features such as minimum sample consumption for analysis and multiprocedures. A wide variety of microsystems were developed for stem cell studies; however, regenerative therapy-targeted applications of microtechnology should be more emphasized and gain more attractions since the regenerative therapy is one of ultimate goals of biologists and bioengineers. In this review, we introduce stem cell researches harnessing well-known microtechniques (microwell, micropattern, and microfluidic channel) in view point of physical principles and how these systems and principles have been implemented appropriately for characterizing stem cells and finding possible regenerative therapies. Biologists may gain information on the principles of microsystems to apply them to find solutions for their current challenges, and engineers may understand limitations of the conventional microsystems and find new chances for further developing practical microsystems. Through the well combination of engineers and biologists, the regenerative therapy-targeted stem cell researches harnessing microtechnology will find better suitable treatments for human disorders.

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          Most cited references62

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          Physics and applications of microfluidics in biology.

          Fluid flow at the microscale exhibits unique phenomena that can be leveraged to fabricate devices and components capable of performing functions useful for biological studies. The physics of importance to microfluidics are reviewed. Common methods of fabricating microfluidic devices and systems are described. Components, including valves, mixers, and pumps, capable of controlling fluid flow by utilizing the physics of the microscale are presented. Techniques for sensing flow characteristics are described and examples of devices and systems that perform bioanalysis are presented. The focus of this review is microscale phenomena and the use of the physics of the scale to create devices and systems that provide functionality useful to the life sciences.
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            Neutrophil chemotaxis in linear and complex gradients of interleukin-8 formed in a microfabricated device.

            Although a wealth of knowledge about chemotaxis has accumulated in the past 40 years, these studies have been hampered by the inability of researchers to generate simple linear gradients instantaneously and to maintain them at steady state. Here we describe a device microfabricated by soft lithography and consisting of a network of microfluidic channels that can generate spatially and temporally controlled gradients of chemotactic factors. When human neutrophils are positioned within a microchannel, their migration in simple and complex interleukin-8 (IL-8) gradients can be tested. The cells exhibit strong directional migration toward increasing concentrations of IL-8 in linear gradients. Neutrophil migration halts abruptly when cells encounter a sudden drop in the chemoattractant concentration to zero ("cliff" gradient). When neutrophils are challenged with a gradual increase and decrease in chemoattractant ("hill" gradient), however, the cells traverse the crest of maximum concentration and migrate further before reversing direction. The technique described in this paper provides a robust method to investigate migratory cells under a variety of conditions not accessible to study by earlier techniques.
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              Generation of Solution and Surface Gradients Using Microfluidic Systems

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                Author and article information

                Journal
                Stem Cells Int
                Stem Cells Int
                SCI
                Stem Cells International
                Hindawi Publishing Corporation
                1687-966X
                1687-9678
                2016
                31 January 2016
                : 2016
                : 6023132
                Affiliations
                1School of Mechanical Engineering, College of Engineering, Chung-Ang University, Seoul 06974, Republic of Korea
                2Department of Biomedical Engineering, School of Medicine, Keimyung University, Daegu 42601, Republic of Korea
                Author notes
                *Yun Seok Heo: yunsheo@ 123456kmu.ac.kr and
                *Joong Yull Park: jrpark@ 123456cau.ac.kr

                Academic Editor: Gerald A. Colvin

                Article
                10.1155/2016/6023132
                4752999
                26941802
                450d8d59-7681-4acf-890a-3bdfff767a9f
                Copyright © 2016 Kihoon Ahn et al.

                This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 24 April 2015
                : 13 November 2015
                : 1 December 2015
                Categories
                Review Article

                Molecular medicine
                Molecular medicine

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