המחברים מבקשים להודות נורמן קרוגר עבור התמיכה הטכנית המצוינת שלו.

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D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Peptide+Hydrogel.">Peptide Hydrogel.</a> Guidelines for Use. Catalog No 354250, (2006).</li></ol>

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השימוש ב-3D ​​פיגומים מציעה את ההזדמנות ללמוד על התפתחות תאים מסוגים שונים במצב תרבית תאים קרובים יותר במצב vivo. עם זאת, לגבי ניתוח של התמיינות נוירונים למשל או מחקרים פונקציונלי יש צורך להתגבר על כמה מכשולים כדי לקבל נתונים מהימנים על כימות למשל של סוגי תאים. <p...

<table border="1" style=";text-align:right;direction:rtl"><tbody><tr><td> שם מגיב </td><td> חברה </td><td> מספר קטלוגי </td><td> תגובות </td></tr><tr><td> PuraMatrix הידרוג פפטיד </td><td> Bioscience BD </td><td> 354250 </td><td></td></tr><tr><td> עכבר laminin אני </td><td> Cultrex </td><td> 400-2009090 </td><td></td></tr><tr><td> סוכרוז </td><td> סיגמא </td><td> S9378-1 ק&quot;ג </td><td></td></tr><tr><td> עז רגיל בסרום </td><td> Dako </td><td> X0907 </td><td></td></tr><tr><td> טריטון X 100 </td><td> רוט </td><td> 3051.3 </td><td></td></tr><tr><td> PBS Dulbecco </td><td> Biochrom AG </td><td> L 1825 </td><td></td></tr><tr><td> HBSS </td><td> Gibco </td><td> 14170-088 </td><td> הנקס &quot;פתרון מאוזן סולט 1X </td></tr><tr><td&gt; ΒIII-טובולין נוגדן </td><td> סנטה קרוז </td><td> SC-51670 </td><td> עכבר, חד שבטיים, 1:500 </td></tr><tr><td> אלקסה פלואוריד 488 </td><td> Invitrogen </td><td> 11029 </td><td> עיזים α העכבר, 1:1000 </td></tr><tr><td> אלקסה פלואוריד 568 </td><td> Invitrogen </td><td> 11031 </td><td> עיזים α העכבר, 1:1000 </td></tr><tr><td> אלקסה פלואוריד 647 </td><td> Invitrogen </td><td> 21235 </td><td> עיזים α העכבר, 1:1000 </td></tr><tr><td> Mowiol 4-88 מגיב </td><td> Calbiochem </td><td> 475904 </td><td></td></tr><tr><td> Dabco </td><td> אלדריץ&#39; </td><td> D2 ,780-2 </td><td> 1,4-Diazabicyclo [2.2.2]% אוקטן 98 </td></tr><tr><td> תא מסננת </td><td> BD Biosciences </td><td> 352350 </td><td> 70 מיקרומטר גודל הנקבוביות </td></tr><tr><td> Saponin </td><td> מרק </td><td> 7695 </td><td></td></tr><tr><td> טריפסין/ EDTA </td><td> GIBCO </td><td> 25300-054 </td><td></td></tr><tr><td> Benzonase 250 U / μl </td><td> מרק </td><td> 1.01654.0001 </td><td></td></tr><tr><td> מעכבי טריפסין </td><td> סיגמא </td><td> T6522 (500 מ&quot;ג) </td><td></td></tr><tr><td> 20% HSA </td><td> Octapharma </td><td> אדם-אלבומין Kabi 20% </td><td></td></tr></tbody></table>

cultivation of human neural progenitor cells in a 3-dimensional self-assembling peptide hydrogel

ההשפעה של 3 ממדי (3D) פיגומים על בידול, צמיחה שגשוג עצבי ולבסוף הוא עניין רב כדי למצוא שיטות חדשות עבור טיפולים מבוססי תאים סטנדרטיים ב הפרעות נוירולוגיות או מחלות ניווניות. 3D מבנים צפויים לספק סביבה הרבה יותר קרוב במצב vivo מאשר תרבויות 2D. בהקשר של רפואה רגנרטיבית, השילוב של פיגומים ביולוגי עם גזע עצביים ועל ובתאים טומן בחובו הבטחה גדולה ככלי טיפולי. 1-5 במערכות התרבות חיקוי סביבת תלת מימדי הוכחו להשפיע על התרבות והתמיינות בסוגים שונים של גזע ובתאים. בזאת, היווצרות של functionalisation microenviroment-3D חשוב כדי לקבוע את הישרדות גורלם של תאים מוטבע. 6-8 כאן השתמשנו PuraMatrix 9,10 (RADA16, AM), הידרוג פפטיד פיגום מבוסס,אשר מתואר היטב בשימוש ללמוד את השפעת הסביבה-3D על תאים מסוגים שונים. 7,11-14 PuraMatrix יכול להיות מותאם אישית בקלות את ייצור סינתטי של סיבים ננו מספק מערכת 3D-התרבות של אמינות גבוהה, אשר בנוסף קסנו חינם. לאחרונה יש לנו חקר את ההשפעה של ריכוז PM על היווצרות של הפיגום. 13 במחקר זה נעשה שימוש בריכוזים של ראש הממשלה הייתה השפעה ישירה על היווצרות של מבנה-3D, אשר הודגם על ידי מיקרוסקופ כוח אטומי. ניתוח בדיעבד של הישרדות והבחנה של hNPCs גילה השפעה של הריכוזים של שימוש PM על גורלם של תאים מוטבע. עם זאת, ניתוח של הישרדות או בידול העצבית באמצעות טכניקות posses immunofluorescence כמה משוכות. כדי לקבל נתונים אמינים, יש לקבוע את המספר הכולל של תאים בתוך מטריצה ​​להשיג את המספר היחסי של למשל. תאים עצביים בסימן טובולין-βIII. זה תנאים מוקדמים טכניקה לנתח את הפיגומים בכל 3 מימדים על ידי מיקרוסקופ confocal או טכניקה דומה כמו מיקרוסקופ פלואורסצנטי מסוגל לקחת Z-ערימות של הדגימה. יתר על כן סוג זה של ניתוח היא מאוד זמן רב. כאן אנו להדגים שיטה לשחרר את התאים מן 3D-פיגומים למשל את הניתוח מאוחר יותר על ידי cytometry הזרימה. בפרוטוקול זה אנושי ובתאים עצביים (hNPCs) של הקו הסלולרי ReNcell VM (Millipore ארה&quot;ב) היו תרבותי מובחן ב-3D פיגומים המורכב PuraMatrix (PM) או PuraMatrix בתוספת laminin (PML). בידיים שלנו PM-ריכוז של 0.25% היה אופטימלי לגידול של 13 תאים, לעומת זאת ריכוז יכול להיות מותאם סוגי תאים אחרים. 12 התאים שפורסמו ניתן להשתמש ללימודי immunocytochemical למשל ונותחו לאחר מכן על ידי cytometry הזרימה. הדבר מאיץ את הניתוח מושוב ושוב, את שאר הנתונים המתקבלים על בסיס רחב יותר, לשפר את אמינות הנתונים.

Watch this Scientific Journal Video about Cultivation of Human Neural Progenitor Cells in a 3-dimensional Self-assembling Peptide Hydrogel at JoVE.com

Cultivation of Human Neural Progenitor Cells in a 3-dimensional Self-assembling Peptide Hydrogel

כאן אנו מתארים את השימוש של הרכבה עצמית 3 ממדי הפיגום לתרבות תאים אנושיים אבי עצביים. אנו מציגים פרוטוקול לשחרר את התאים מן הפיגומים כדי להיות מנותח למשל לאחר מכן על ידי cytometry הזרימה. פרוטוקול זה עשוי להתאים סוגי תאים אחרים לבצע מחקרים מפורטים באופן מכניסטי.

טיפוח האדם ובתאים עצבית ב Hydrogel עצמית להרכבת 3 מימדי פפטיד

The  influence of 3-dimensional (3D) scaffolds on growth, proliferation and finally  neuronal differentiation is of great interest in order to find new ...

cultivation-human-neural-progenitor-cells-3-dimensional-self

Research

JoVE Journal

Bioengineering

16.5K Views.  University of Rostock. כאן אנו מתארים את השימוש של הרכבה עצמית 3 ממדי הפיגום לתרבות תאים אנושיים אבי עצביים. אנו מציגים פרוטוקול לשחרר את התאים מן הפיגומים כדי להיות מנותח למשל לאחר מכן על ידי cytometry הזרימה. פרוטוקול זה עשוי להתאים סוגי תאים אחרים לבצע מחקרים מפורטים באופן מכניסטי.

Video: Cultivation of Human Neural Progenitor Cells in a 3-dimensional Self-assembling Peptide Hydrogel

A Method for Ovarian Follicle Encapsulation and Culture in a Proteolytically Degradable 3 Dimensional System

The ovarian follicle is the functional unit of the ovary that secretes sex hormones and supports oocyte maturation. In vitro follicle techniques provide a tool to model follicle development in order to investigate basic biology, and are further being developed as a technique to preserve fertility in the clinic1-4. Our in vitro culture system employs hydrogels in order to mimic the native ovarian environment by maintaining the 3D follicular architecture, cell-cell interactions and paracrine signaling that direct follicle development 5. Previously, follicles were successfully cultured in alginate, an inert algae-derived polysaccharide that undergoes gelation with calcium ions6-8. Alginate hydrogels formed at a concentration of 0.25% w/v were the most permissive for follicle culture, and retained the highest developmental competence 9. Alginate hydrogels are not degradable, thus an increase in the follicle diameter results in a compressive force on the follicle that can impact follicle growth10. We subsequently developed a culture system based on a fibrin-alginate interpenetrating network (FA-IPN), in which a mixture of fibrin and alginate are gelled simultaneously. This combination provides a dynamic mechanical environment because both components contribute to matrix rigidity initially; however, proteases secreted by the growing follicle degrade fibrin in the matrix leaving only alginate to provide support. With the IPN, the alginate content can be reduced below 0.25%, which is not possible with alginate alone 5. Thus, as the follicle expands, it will experience a reduced compressive force due to the reduced solids content. Herein, we describe an encapsulation method and an in vitro culture system for ovarian follicles within a FA-IPN. The dynamic mechanical environment mimics the natural ovarian environment in which small follicles reside in a rigid cortex and move to a more permissive medulla as they increase in size11. The degradable component may be particularly critical for clinical translation in order to support the greater than 106-fold increase in volume that human follicles normally undergo in vivo .

A new method for ovarian follicle encapsulation in a 3D fibrin-alginate interpenetrating network is described. This system combines structural support with proteolytic degradation to support the development of immature follicles to produce mature oocytes. This method may be applied to culture cell aggregates to maintain cell-cell contacts without limiting expansion.

שיטה Encapsulation השחלות זקיק ותרבות מערכת 3 מתכלה Proteolytically מימדי

The ovarian follicle is the functional unit of the ovary that secretes sex hormones and supports oocyte maturation. In vitro  follicle techniques provide ...

Organotypic Collagen I Assay: A Malleable Platform to Assess Cell Behaviour in a 3-Dimensional Context

Cell migration is fundamental to many aspects of biology, including development, wound healing, the cellular responses of the immune system, and metastasis of tumor cells. Migration has been studied on glass coverslips in order to make cellular dynamics amenable to investigation by light microscopy. However, it has become clear that many aspects of cell migration depend on features of the local environment including its elasticity, protein composition, and pore size, which are not faithfully represented by rigid two dimensional substrates such as glass and plastic 1. Furthermore, interaction with other cell types, including stromal fibroblasts 2 and immune cells 3, has been shown to play a critical role in promoting the invasion of cancer cells. Investigation at the molecular level has increasingly shown that molecular dynamics, including response to drug treatment, of identical cells are significantly different when compared in vitro and in vivo 4. 
Ideally, it would be best to study cell migration in its naturally occurring context in living organisms, however this is not always possible. Intermediate tissue culture systems, such as cell derived matrix, matrigel, organotypic culture (described here) tissue explants, organoids, and xenografts, are therefore important experimental intermediates. These systems approximate certain aspects of an in vivo environment but are more amenable to experimental manipulation such as use of stably transfected cell lines, drug treatment regimes, long term and high-resolution imaging. Such intermediate systems are especially useful as proving grounds to validate probes and establish parameters required to image the dynamic response of cells and fluorescent reporters prior to undertaking imaging in vivo 5. As such, they can serve an important role in reducing the need for experiments on living animals.

A method is described for the preparation of a 3-dimensional matrix consisting of collagen type I and primary human fibroblasts. This organotypic gel serves as a useful substrate to assess invasive cell migration because it mimics basic features of tissue stroma and is amenable to many forms of microscopy.

קולגן אני Assay Organotypic: פלטפורמה חשילה לבחינת התנהגות תא בהקשר 3-Dimensional

Cell migration is fundamental to many aspects of biology, including development, wound healing, the cellular responses of the immune system, and ...

Adaptation of a Haptic Robot in a 3T fMRI

Functional magnetic resonance imaging (fMRI) provides excellent functional brain imaging via the BOLD signal 1 with advantages including non-ionizing radiation, millimeter spatial accuracy of anatomical and functional data 2, and nearly real-time analyses 3. Haptic robots provide precise measurement and control of position and force of a cursor in a reasonably confined space. Here we combine these two technologies to allow precision experiments involving motor control with haptic/tactile environment interaction such as reaching or grasping. The basic idea is to attach an 8 foot end effecter supported in the center to the robot 4 allowing the subject to use the robot, but shielding it and keeping it out of the most extreme part of the magnetic field from the fMRI machine (Figure 1).
The Phantom Premium 3.0, 6DoF, high-force robot (SensAble Technologies, Inc.) is an excellent choice for providing force-feedback in virtual reality experiments 5, 6, but it is inherently non-MR safe, introduces significant noise to the sensitive fMRI equipment, and its electric motors may be affected by the fMRI's strongly varying magnetic field. We have constructed a table and shielding system that allows the robot to be safely introduced into the fMRI environment and limits both the degradation of the fMRI signal by the electrically noisy motors and the degradation of the electric motor performance by the strongly varying magnetic field of the fMRI. With the shield, the signal to noise ratio (SNR: mean signal/noise standard deviation) of the fMRI goes from a baseline of &tilde;380 to &tilde;330, and &tilde;250 without the shielding. The remaining noise appears to be uncorrelated and does not add artifacts to the fMRI of a test sphere (Figure 2). The long, stiff handle allows placement of the robot out of range of the most strongly varying parts of the magnetic field so there is no significant effect of the fMRI on the robot. The effect of the handle on the robot's kinematics is minimal since it is lightweight (&tilde;2.6 lbs) but extremely stiff 3/4" graphite and well balanced on the 3DoF joint in the middle. The end result is an fMRI compatible, haptic system with about 1 cubic foot of working space, and, when combined with virtual reality, it allows for a new set of experiments to be performed in the fMRI environment including naturalistic reaching, passive displacement of the limb and haptic perception, adaptation learning in varying force fields, or texture identification 5, 6.

The adaptation and use of a haptic robot in a 3T fMRI is described.

ההסתגלות של רובוט לתחושה ב fMRI 3T

Functional magnetic resonance imaging (fMRI) provides excellent functional brain imaging via the BOLD signal 1 with advantages including non-ionizing ...

Electric Field-controlled Directed Migration of Neural Progenitor Cells in 2D and 3D Environments

Endogenous electric fields (EFs) occur naturally in vivo and play a critical role during tissue/organ development and regeneration, including that of the central nervous system1,2. These endogenous EFs are generated by cellular regulation of ionic transport combined with the electrical resistance of cells and tissues. It has been reported that applied EF treatment can promote functional repair of spinal cord injuries in animals and humans3,4. In particular, EF-directed cell migration has been demonstrated in a wide variety of cell types5,6, including neural progenitor cells (NPCs)7,8. Application of direct current (DC) EFs is not a commonly available technique in most laboratories. We have described detailed protocols for the application of DC EFs to cell and tissue cultures previously5,11. Here we present a video demonstration of standard methods based on a calculated field strength to set up 2D and 3D environments for NPCs, and to investigate cellular responses to EF stimulation in both single cell growth conditions in 2D, and the organotypic spinal cord slice in 3D. The spinal cordslice is an ideal recipient tissue for studying NPC ex vivo behaviours, post-transplantation, because the cytoarchitectonic tissue organization is well preserved within these cultures9,10. Additionally, this ex vivo model also allows procedures that are not technically feasible to track cells in vivo using time-lapse recording at the single cell level. It is critically essential to evaluate cell behaviours in not only a 2D environment, but also in a 3D organotypic condition which mimicks the in vivo environment. This system will allow high-resolution imaging using cover glass-based dishes in tissue or organ culture with 3D tracking of single cell migration in vitro and ex vivo and can be an intermediate step before moving onto in vivo paradigms.

This protocol demonstrates methods used to establish 2D and 3D environments in custom-designed electrotactic chambers, which can track cells in vivo/ex vivo using time-lapse recording at the single cell level, in order to investigate galvanotaxis/electrotaxis and other cellular responses to direct current (DC) electric fields (EFs).

שדה חשמלי מבוקר בימוי הגירה של ובתאים עצביות בסביבות 2 ד ו 3D

Endogenous electric fields (EFs) occur naturally in vivo and play a critical role during tissue/organ development and regeneration, including that of the ...

Self-reporting Scaffolds for 3-Dimensional Cell Culture

Culturing cells in 3D on appropriate scaffolds is thought to better mimic the in vivo microenvironment and increase cell-cell interactions. The resulting 3D cellular construct can often be more relevant to studying the molecular events and cell-cell interactions than similar experiments studied in 2D. To create effective 3D cultures with high cell viability throughout the scaffold the culture conditions such as oxygen and pH need to be carefully controlled as gradients in analyte concentration can exist throughout the 3D construct. Here we describe the methods of preparing biocompatible pH responsive sol-gel nanosensors and their incorporation into poly(lactic-co-glycolic acid) (PLGA) electrospun scaffolds along with their subsequent preparation for the culture of mammalian cells. The pH responsive scaffolds can be used as tools to determine microenvironmental pH within a 3D cellular construct. Furthermore, we detail the delivery of pH responsive nanosensors to the intracellular environment of mammalian cells whose growth was supported by electrospun PLGA scaffolds. The cytoplasmic location of the pH responsive nanosensors can be utilized to monitor intracellular pH (pHi) during ongoing experimentation.

Biocompatible pH responsive sol-gel nanosensors can be incorporated into poly(lactic-co-glycolic acid) (PLGA) electrospun scaffolds. The produced self-reporting scaffolds can be used for in&#160;situ monitoring of microenvironmental conditions whilst culturing cells upon the scaffold. This is beneficial as the 3D cellular construct can be monitored in real-time without disturbing the experiment.

פיגומים דיווח עצמי לתרבית תאים 3-Dimensional

Culturing cells in 3D on appropriate scaffolds is thought to better mimic the in vivo microenvironment and increase cell-cell interactions. The resulting ...

Cultivation of Mammalian Cells Using a Single-use Pneumatic Bioreactor System

Recent advances in mammalian, insect, and stem cell cultivation and scale-up have created tremendous opportunities for new therapeutics and personalized medicine innovations. However, translating these advances into therapeutic applications will require in vitro systems that allow for robust, flexible, and cost effective bioreactor systems. There are several bioreactor systems currently utilized in research and commercial settings; however, many of these systems are not optimal for establishing, expanding, and monitoring the growth of different cell types. The culture parameters most challenging to control in these systems include, minimizing hydrodynamic shear, preventing nutrient gradient formation, establishing uniform culture medium aeration, preventing microbial contamination, and monitoring and adjusting culture conditions in real-time. Using a pneumatic single-use bioreactor system, we demonstrate the assembly and operation of this novel bioreactor for mammalian cells grown on micro-carriers. This bioreactor system eliminates many of the challenges associated with currently available systems by minimizing hydrodynamic shear and nutrient gradient formation, and allowing for uniform culture medium aeration. Moreover, the bioreactor&#8217;s software allows for remote real-time monitoring and adjusting of the bioreactor run parameters. This bioreactor system also has tremendous potential for scale-up of adherent and suspension mammalian cells for production of a variety therapeutic proteins, monoclonal antibodies, stem cells, biosimilars, and vaccines.

Using a pneumatic bioreactor, we demonstrate the assembly, operation, and performance of this single-use bioreactor system for the growth of mammalian cells.

טיפוח של תאי יונקים באמצעות מערכת פניאומטיים Bioreactor יחיד שימוש

Recent advances in mammalian, insect, and stem cell cultivation and scale-up have created tremendous opportunities for new therapeutics and personalized ...

Improved 3D Hydrogel Cultures of Primary Glial Cells for In Vitro Modelling of Neuroinflammation

In the central nervous system, numerous acute injuries and neurodegenerative disorders, as well as implanted devices or biomaterials engineered to enhance function result in the same outcome: excess inflammation leads to gliosis, cytotoxicity, and/or formation of a glial scar that collectively exacerbate injury or prevent healthy recovery. With the intent of creating a system to model glial scar formation and study inflammatory processes, we have generated a 3D cell scaffold capable of housing primary cultured glial cells: microglia that regulate the foreign body response and initiate the inflammatory event, astrocytes that respond to form a fibrous scar, and oligodendrocytes that are typically vulnerable to inflammatory injury. The present work provides a detailed step-by-step method for the fabrication, culture, and microscopic characterization of a hyaluronic acid-based 3D hydrogel scaffold with encapsulated rat brain-derived glial cells. Further, protocols for characterization of cell encapsulation and the hydrogel scaffold by confocal immunofluorescence and scanning electron microscopy are demonstrated, as well as the capacity to modify the scaffold with bioactive substrates, with incorporation of a commercial basal lamina mixture to improved cell integration.

Improved 3D Hydrogel Cultures of Primary Glial Cells for In Vitro Modelling of Neuroinflammation

Herein, we present a protocol for the 3D culture of rat brain-derived glia cells, including astrocytes, microglia, and oligodendrocytes. We demonstrate primary cell culture, methacrylated hyaluronic acid (HAMA) hydrogel synthesis, HAMAphoto-polymerization and cell encapsulation, and sample processing for confocal and scanning electron microscopic imaging.

שיפור תרבויות הידרוג 3D של תאי גליה העיקרי עבור במבחנה דוגמנות של Neuroinflammation

In the central nervous system, numerous acute injuries and neurodegenerative disorders, as well as implanted devices or biomaterials engineered to enhance ...

Hyaluronic-Acid Based Hydrogels for 3-Dimensional Culture of Patient-Derived Glioblastoma Cells

Glioblastoma (GBM) is the most common, yet most lethal, central nervous system cancer. In recent years, many studies have focused on how the extracellular matrix (ECM) of the unique brain environment, such as hyaluronic acid (HA), facilitates GBM progression and invasion. However, most in vitro culture models include GBM cells outside of the context of an ECM. Murine xenografts of GBM cells are used commonly as well. However, in vivo models make it difficult to isolate the contributions of individual features of the complex tumor microenvironment to tumor behavior. Here, we describe an HA hydrogel-based, three-dimensional (3D) culture platform that allows researchers to independently alter HA concentration and stiffness. High molecular weight HA and polyethylene glycol (PEG) comprise hydrogels, which are crosslinked via Michael-type addition in the presence of live cells. 3D hydrogel cultures of patient-derived GBM cells exhibit viability and proliferation rates as good as, or better than, when cultured as standard gliomaspheres. The hydrogel system also enables incorporation of ECM-mimetic peptides to isolate effects of specific cell-ECM interactions. Hydrogels are optically transparent so that live cells can be imaged in 3D culture. Finally, HA hydrogel cultures are compatible with standard techniques for molecular and cellular analyses, including PCR, Western blotting and cryosectioning followed by immunofluorescence staining.

Here, we present a protocol for three-dimensional culture of patient-derived glioblastoma cells within orthogonally tunable biomaterials designed to mimic the brain matrix. This approach provides an in vitro, experimental platform that maintains many characteristics of in vivo glioblastoma cells typically lost in culture.

חומצה היאלורונית מבוסס Hydrogels לתרבות תלת-ממדי של החולה-Derived גליובלסטומה תאים

Glioblastoma (GBM) is the most common, yet most lethal, central nervous system cancer. In recent years, many studies have focused on how the extracellular ...

Generation of Dynamical Environmental Conditions using a High-Throughput Microfluidic Device

Mimicking in vivo environmental conditions is crucial for in vitro studies on complex life machinery. However, current techniques targeting live cells and organs are either highly expensive, like robotics, or lack nanoliter volume and millisecond time accuracy in liquid manipulation. We herein present the design and fabrication of a microfluidic system, which consists of 1,500 culture units, an array of enhanced peristaltic pumps and an on-site mixing modulus. To demonstrate the capacities of the microfluidic device, neural stem cell (NSC) spheres are maintained in the proposed system. We observed that when the NSC sphere is exposed to CXCL in day 1 and EGF in day 2, the round-shaped conformation is well maintained. Variation in the input order of 6 drugs causes morphological changes to the NSC sphere and the expression level representative marker for NSC stemness (i.e., Hes5 and Dcx). These results indicate that dynamic and complex environmental conditions have great effects on NSC differentiation and self-renewal, and the proposed microfluidic device is a suitable platform for high throughput studies on the complex life machinery.

We present a microfluidic system for high throughput studies on complex life machinery, which consists of 1500 culture units, an array of enhanced peristaltic pumps and an on-site mixing modulus. The microfluidic chip allows for the analysis of the highly complex and dynamic micro-environmental conditions in vivo.

יצירת תנאי סביבה דינמיים באמצעות מכשיר מיקרופלואידי בעל תפוקה גבוהה

Mimicking in vivo environmental conditions is crucial for in vitro studies on complex life machinery. However, current techniques targeting live cells and ...

Synthesis of Strong Adhesive Hydrogel, Gelatin O-Nitrosobenzaldehyde

Adhesive materials have become popular biomaterials in the field of biomedical and tissue engineering. In our previous work, we presented a new material - gelatin o-nitrosobenzaldehyde (gelatin-NB) - which is mainly used for tissue regeneration and has been validated in animal models of corneal injury and inflammatory bowel disease. This is a novel hydrogel formed by modifying biological gelatin with o-nitrosobenzaldehyde (NB). Gelatin-NB was synthesized by activating the carboxyl group of NB-COOH and reacting with gelatin through 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC) and N-hydroxysuccinimide (NHS). The obtained compound was purified to generate the final product, which can be stably stored for at least 18 months. NB has a strong adhesion to -NH2 on the tissue, which can form many C = N bonds, thus increasing the adhesion of gelatin-NB to the tissue interface. The preparation process comprises steps for the synthesis of the NB-COOH group, modification of the group, synthesis of gelatin-NB, and purification of the compound. The goal is to describe the specific synthesis process of gelatin-NB in detail and to demonstrate the application of gelatin-NB to damage repair. Moreover, the protocol is presented to further strengthen and expand the nature of the material produced by the scientific community for more applicable scenarios.

The protocol presented here shows the synthesis of a strong adhesive hydrogel gelatin o-nitrosobenzaldehyde (gelatin-NB). Gelatin-NB has rapid and efficient tissue adhesion ability, which can form a strong physical barrier to protect wound surfaces, so it is expected to be applied to the field of injury repair biotechnology.

סינתזה של הידרוג'ל דבק חזק, ג'לטין O-Nitrosobenzaldehyde

Adhesive materials have become popular biomaterials in the field of biomedical and tissue engineering. In our previous work, we presented a new material - ...