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One-step stem cell cluster culture process using hydrophilic tapered stencil mask

2010 International Symposium on Micro-NanoMechatronics and Human Science, 2010

This paper reports on new device for 3D cluster formation of stem cells under combinatorial seeding conditions - cell population and density. The device has an array of tapered holes of various sizes, and the surface is modified with hydrophilic polymer to prevent cell adhesion. Thus, the cells seeded onto the device aggregate in the areas defined by the holes. ...


Effect of hydroxyapatite particles on stem cell response in nanofiber scaffolds

Proceedings of the 2010 IEEE 36th Annual Northeast Bioengineering Conference (NEBEC), 2010

Rotator cuff tears are among the most common shoulder injuries that require surgery. High failure rates of biological graft-based repairs underscore the need for functional alternatives. Specifically, functional grafts must incorporate the gradient of mineralization from tendon to bone in order to be biomimetic. In this study, effects of varying concentrations of mineral content in aligned nanofiber scaffolds on human ...


Comparative proteomic analysis of neural stem cells between differentiating and undifferentiating to dopaminergic neuron

2007 IEEE/ICME International Conference on Complex Medical Engineering, 2007

The neural stem cells were induced by low-level dopamine (DA). We allowed cells 72 h of differentiation before protein extraction. The global proteins of neural stem cells and dopaminergic neurons were extracted. In this study, the protein from cell lysat was rudiment separated by SDS-PAGE, and the gel strip was cut into several portions. The protein in each portion is ...


In the Spotlight: Tissue Engineering

IEEE Reviews in Biomedical Engineering, 2013

This paper is based on tissue engineering. Here a scaffold created outside the body to provide key biophysical or chemical signals to stem cells or prime the body endogenously such that it is more hospitable to injected stem cells, it is clear that simply injecting naked stem cells may not yield their full potential.


Leaving Educating Women In Its WAKE: Amplifying the work of those leading global change [Amperes: Current Affairs from Around the World]

IEEE Women in Engineering Magazine, 2016

When asked, many women credit a former teacher, mentor, relative, or friend with giving them the confidence to pursue a career in engineering despite a hesitation of some kind. Whether it be that the way forward would require being one of few females in science, technology, engineering, and math (STEM) classes, community pressure to take a different path with one?s ...


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  • One-step stem cell cluster culture process using hydrophilic tapered stencil mask

    This paper reports on new device for 3D cluster formation of stem cells under combinatorial seeding conditions - cell population and density. The device has an array of tapered holes of various sizes, and the surface is modified with hydrophilic polymer to prevent cell adhesion. Thus, the cells seeded onto the device aggregate in the areas defined by the holes. By varying the shape of the holes, cluster cultures can be performed under different conditions at one time. The device is easily incorporated into conventional cluster culture protocols by just placing the device onto an arbitrary culture substrate. Combinatorial cluster formation of stem cells derived from pancreatic duct was successfully demonstrated on ultra low attachment surface and Matrigel. The device should be useful for one-step combinatorial analysis to find optimal cluster culture conditions for various types of cells, and the more, for mass production of standardized embryonic body (EB) necessary in tissue engineering research.

  • Effect of hydroxyapatite particles on stem cell response in nanofiber scaffolds

    Rotator cuff tears are among the most common shoulder injuries that require surgery. High failure rates of biological graft-based repairs underscore the need for functional alternatives. Specifically, functional grafts must incorporate the gradient of mineralization from tendon to bone in order to be biomimetic. In this study, effects of varying concentrations of mineral content in aligned nanofiber scaffolds on human mesenchymal stem cells (hMSC) are evaluated. It is hypothesized that mineral content will regulate cell response, matrix deposition, and integrin gene expression. hMSC were seeded on aligned nanofiber scaffolds of polylactide-co-glycolide with 0%, 10%, and 15% hydroxyapatite content, and were maintained in chondrogenic medium. Cell proliferation (n=5), collagen deposition (n=5), and gene expression (n=5) for Collagen X, Sox9, osteopontin, osteonectin, and osteocalcin were determined over 42 days. Cell number was found to differ between the non-mineralized and mineralized groups. Significant increase in collagen deposition over time was observed in mineralized scaffold groups, and the 15% group showing significantly higher deposition than the 0% group by day 42. Lower expressions of chondrocyte hyperotrophy marker Collagen X and chondrogenic marker Sox9 and maintained high expressions of osteogenic markers osteopontin, osteonectin, and osteocalcin suggest an osteogenic lineage for the stem cells. In conclusion, addition of HA particles influenced hMSC proliferation, matrix deposition, and may induce an osteogenic differentiation response from the stem cells.

  • Comparative proteomic analysis of neural stem cells between differentiating and undifferentiating to dopaminergic neuron

    The neural stem cells were induced by low-level dopamine (DA). We allowed cells 72 h of differentiation before protein extraction. The global proteins of neural stem cells and dopaminergic neurons were extracted. In this study, the protein from cell lysat was rudiment separated by SDS-PAGE, and the gel strip was cut into several portions. The protein in each portion is digested by trypsin, and then the peptides mixtures were analyzed by mass spectrometry (LC-MS/MS). 839 proteins in the neural stem cells and 718 proteins in the dopaminergic neuron were identified. The nestin protein was found in the NSCs and the Sodium-dependent dopamine transporter (DA transporter)(DAT) was found in the dopaminergic neuron which was induced by low level DA. The cytoskeletal proteins rearranged after the NSCs differentiated and regulating proteins changed a lot.

  • In the Spotlight: Tissue Engineering

    This paper is based on tissue engineering. Here a scaffold created outside the body to provide key biophysical or chemical signals to stem cells or prime the body endogenously such that it is more hospitable to injected stem cells, it is clear that simply injecting naked stem cells may not yield their full potential.

  • Leaving Educating Women In Its WAKE: Amplifying the work of those leading global change [Amperes: Current Affairs from Around the World]

    When asked, many women credit a former teacher, mentor, relative, or friend with giving them the confidence to pursue a career in engineering despite a hesitation of some kind. Whether it be that the way forward would require being one of few females in science, technology, engineering, and math (STEM) classes, community pressure to take a different path with one?s career and family life, or other concerns, challenges arise. Nevertheless, they followed their passions into rewarding, fulfilling careers. Perhaps this sounds familiar to some of you reading right now. Now, how often have you considered becoming that support system or role model for someone else?

  • An approach to ex vivo expansion of stem cells

    Presented paper describes experimental works within the development of a new bioreactor which is specialized on hematopoietic stem cells. Preceding experiments with static suspension cultures and feeder layer-supported cultures were used to find the optimal media consistence and culture conditions. Perfused cultures with reproducible courses of experiments were proved to obtain higher expansion rates. The process parameters and special optical parameters were determined. The research on experimental setup is useful for further clinical applications.

  • Microelectronic channel bridge and signal regeneration of injured spinal cords

    We are searching for a way to generate neural function recovery by introducing an implantable microelectronic system. Prototypes of the so-called microelectronic neural-bridging systems have been realized in the form of integrated circuits. The integrated circuits were realized in a standard CMOS process. In a series of animal experiments, we have demonstrated that an interrupted spinal cord could be bridged and neural signals were regenerated. The idea of microelectronics channel bridging and signal regeneration of injured spinal cords was primarily demonstrated.

  • Sorting stem cells using a femtosecond laser inscribed biochip

    We present a microfabricated cell sorting mechanism, inscribed in fused silica using femtosecond laser pulses, aimed at separating embryonic stem cells from differentiated cells based on the dissimilarity in their cytoskeletal elasticity.

  • Intersecting Nano, Biomedicine, and Physics: Goel Addresses Global Health Challenges [WIE from Around the World]

    Lisa Goel was born and raised in a rural town in Mississippi. Her father, a general and vascular surgeon as well as a family physician, moved to this small town because of its great need for doctors. She was inspired by his "daily service and dedicat ion toward helping people who could not afford basic health care," and she knew that, like her father, she wanted to spend her life helping others.

  • Comparison of texture features for human embryonic stem cells with bio-inspired multi-class support vector machine

    Determining the meaningful texture features for human embryonic stem cells (hESC) is important in the development of online hESC classification system. This paper proposes the use of novel support vector machine with bio-inspired one-against-all (OAA) multi-class structural and statistical Gabor descriptors for hESC classification. It investigates the statistical histogram information at four different orientations and two different window sizes of the Gabor filter. It demonstrates that statistical Gabor features are more accurate and reliable than a conventional histogram based features.



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