Questo lavoro è stato sostenuto da un assegno di ricerca dal National Institutes of Health (HL068915 di DBC), un nuovo Researcher Award del Fondo di ricerca Thrasher (al PAC), un Grant-in-Aid dalla American Heart Association (12GRNT11910008 a DBC) , un assegno di ricerca da Heart Foundation dei Bambini (da DBC), e le donazioni a Hospital di conduzione cardiaca Fondo dei Bambini di Boston, la Ryan Famiglia Endowment, e da David Pullman.

Qui ci dimostrare l&#39;isolamento di COL1 dalla pelle di agnello. Come scritto, questo protocollo può anche essere utilizzata per isolare con successo COL1 da coniglio e pelle umana. 1. Preparare Dermal campione <ol><li> Equilibrare tutti i reagenti a 4 ° C prima dell&#39;uso. </li><li> Risciacquare campione cutanea (25-50 g) in DH ghiacciata 2 O e rimuovere eventuali lana, pelliccia o capelli con crema depilatoria. </li><li> Utilizzare una lama di rasoio singolo bordo per raschiare il pulito campione di tessuto connettivo e grasso. </li><li> Lavare il campione in ghiaccio-freddo dH 2 O. </li><li> Tagliate il campione di pelle in 1 cm x 1 centimetri pezzi con una lama di rasoio singolo bordo. </li></ol> 2. Rimuovere noncollagenous solubilizzata Materiale <ol><li> Pesare 5 g di campione per tubo da 50 ml e aggiungere 30 ml di ghiacciata 0.5 M acetato di sodio. </li><li> Mescolare provette per 1 min alla regolazione di 6 m / sec utilizzando un adattatore tubo da 50 ml in omogeneizzatore da banco. </li><li> Scartare supernatant e ripetere per un totale di 7 sodio acetato cicli di lavaggio. </li><li> Lavare il campione in DH ghiacciata 2 O e mescolare una volta per rimuovere acetato di sodio residuo. </li><li> Utilizzare una spatola per comprimere il campione contro il lato del tubo per rimuovere il liquido in eccesso e poi trasferire in una provetta conica da 50 ml fresco. </li></ol> 3. Collagene di tipo I Estrazione <ol><li> Lavare il campione due volte in 2 ml / g 0,075 M tampone sodio citrato per 1 min a 6 m / sec nella omogeneizzatore banco comprimendo il campione e scartando il supernatante dopo ogni lavaggio. </li><li> Aggiungere un fresco 2 ml / g aliquota di 0,075 M tampone sodio citrato al campione. </li><li> Eseguire 6 sequenziale 1 min, 6 cicli banco mix omogeneizzatore m / sec di agitazione senza rimuovere il cuscinetto tra ogni ciclo. </li><li> Trasferire la spessa, chiara surnatante in un tubo di raccolta. </li><li> Aggiungere un ulteriore 1 ml / g 0,075 M di sodio tampone citrato al campione ed effettuare un ultimo banco omogeneizzatore agitazioneCiclo zione. </li><li> Aggiungere questo surnatante finale a un tubo di raccolta. </li><li> Centrifugare la provetta di raccolta a 3.200 xg per 10 min a 4 ° C. </li><li> Trasferire il surnatante al vano superiore di un peso molecolare 100.000 tagliare dispositivo di filtro centrifugo. </li><li> Centrifugare a 3200 xg per 30 min a 4 ° C. </li><li> Trasferire il purificato COL1 dal vano superiore in una provetta pulita e conservare a 4 ° C. </li></ol>

<ol>
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Un componente fondamentale di questo metodo è la compressione efficiente ripetuta del campione dermica per rimuovere il liquido in eccesso. E &#39;fondamentale per rimuovere acetato di sodio quanto possibile al punto 2.5 comprimendo il campione. Usiamo una spatola per compattare la pelle contro il lato del tubo, tuttavia, garza potrebbe anche essere utilizzato, anche se ciò richiederebbe la rimozione del campione dalla provetta e aumentare il tempo necessario per eseguire questi passaggi. Allo stesso modo, è importan...

Per decenni, i ricercatori e venditori commerciali hanno isolato solubilizzato COL1 da un assortimento di fonti tissutali incluse pelle e tendine con qualche variazione di un protocollo di estrazione acida semplice seguito da neutralizzazione, che si traduce in una risospensione di una matrice di fibrille col1 organizzati utilizzabile per una moltitudine di applicazioni biomediche 1-4. Mentre ci sono molti esempi di applicazioni cliniche per COL1, alcuni di questi impiegano COL1 autologously-derivato per la preparazione di questa proteina richiede estrazioni lunghi prendere giorni o settimane per effettuare 5-7. Come risultato, gli investigatori ricerca e medici usano generalmente costosi, preparazioni commerciali di COL1 che vengono preparati utilizzando tessuti non umani come ratto, bovino, o derma suino o utilizzando pelle rimosso da cadaveri o dopo la circoncisione maschile. Per applicazioni rigenerative, molti di questi prodotti mostrano variabilità rispetto alla loro capacità di formare solidimatrici o costrutti di tessuto in grado di supportare attaccamento e la crescita cellulare. Di conseguenza, vi è la necessità distinto per un nuovo metodo standardizzato progettato per estrarre rapidamente COL1 da fonti tissutali autologhi accessibili e abbondanti. Tale metodo permetterebbe di risparmiare tempo e denaro nel contesto di ricerca in cui COL1 potrebbe essere estratto dal modello animale di interesse e utilizzato per la sperimentazione preclinica dei tessuti ingegnerizzati montati su scaffold a base di collagene. Allo stesso tempo, avendo la possibilità di utilizzare una rapida isolato, COL1 autologously derivata nella clinica aumenterebbe la sicurezza complessiva per i pazienti che altrimenti ricevere allogeniche o xenogeniche preparazioni. Per i pazienti che ricevono una preparazione autogeneic, questo metodo semplificato potrebbe ridurre notevolmente l&#39;intervallo tra raccolta biopsia e l&#39;applicazione di collagene. Per queste ragioni, abbiamo cercato di migliorare un isolamento e la purificazione metodo COL1 lunga tradizione utilizzando ad alta velocità agitazione e le dimensioni esclusione centrifugazione. Questo metodo è semplice da eseguire utilizzando tamponi standard e le attrezzature presenti in molti laboratori. Con l&#39;ausilio di agitazione ad alta velocità, il nostro protocollo riduce il tempo necessario per isolare solubile, dermica COL1 da circa 10 giorni a meno di 3 ore 8. È importante sottolineare che questo metodo può essere facilmente eseguito in ambito clinico per preparare COL1 autologously-derivato per l&#39;uso in pazienti durante un&#39;unica serie di procedure.

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			<td height="43" style="height:43px;width:123px;">FastPrep-24 System</td>
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			<td height="190" style="height:190px;width:123px;">Centrifuge</td>
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an improved method for the preparation of type i collagen from skin

Tipo solubile 1 del collagene (COL1) è ampiamente utilizzato come substrato adesivo per colture cellulari e come impalcatura cellulare per applicazioni rigenerative. Clinicamente, questa proteina è ampiamente utilizzato per la chirurgia estetica, iniezioni dermiche, innesto osseo, e chirurgia ricostruttiva. Le fonti di COL1 per queste procedure sono comunemente non umano, che aumenta il potenziale di infiammazione e rigetto nonché trasmissione di malattie xenobiotico. In considerazione di ciò, un metodo per purificare in modo efficiente e rapido da COL1 quantità limitate di tessuti autologously derivati ​​elusione molti di questi problemi, tuttavia, protocolli di isolamento standard sono lunghe e spesso richiedono grandi quantità di tessuti di collagene. Qui, dimostriamo un metodo di estrazione COL1 efficiente che riduce il tempo necessario per isolare e purificare questa proteina da circa 10 giorni a meno di 3 ore. Abbiamo scelto il derma come fonte tessuto a causa della sua disponibilità durante molte procedure chirurgiche. Til suo metodo utilizza i buffer di estrazione tradizionali combinati con agitazione vigorosa e filtrazione centrifuga per ottenere altamente puro, COL1 solubile da piccole quantità di corium. In breve, biopsie dermici sono lavati accuratamente in DH ghiacciata 2 O dopo la rimozione di grasso, tessuto connettivo, e capelli. I campioni di pelle sono spogliati di proteine ​​non collagene e polisaccaridi con 0,5 M di acetato di sodio e un banco omogeneizzatore ad alta velocità. Collagene da residui solidi viene successivamente estratta con un tampone sodio citrato 0,075 M usando l&#39;omogeneizzatore. Questi estratti sono purificati con 100.000 MW di cut-off filtri centrifughi che producono preparazioni col1 di qualità comparabile o superiore ai prodotti commerciali o di quelli ottenuti utilizzando le procedure tradizionali. Prevediamo che questo metodo faciliterà l&#39;utilizzazione di autologously derivato COL1 per una moltitudine di ricerca e applicazioni cliniche.

Questo protocollo isolamento COL1 richiede circa 2 ore e 15 minuti per completare. La Figura 1 mostra un diagramma schematico che illustra le fasi principali di questa procedura. Preparazione del campione ed eseguendo i 7 cicli di agitazioni alta velocità e risciacqui con acetato di sodio richiede circa 35 min (Figure 1A-C). L&#39;esecuzione di una agitazione e risciacquo con dH 2 O richiede circa 5 min (Figure 1D e 1E). Aggiunta di citrato di sodio e sottop...

Watch this Scientific Journal Video about An Improved Method for the Preparation of Type I Collagen From Skin at JoVE.com

An Improved Method for the Preparation of Type I Collagen From Skin

Procedure tradizionali per l&#39;isolamento di tipo solubile 1 del collagene (COL1) richiedono circa 10 giorni dall&#39;inizio alla fine a causa di incubazione tampone lunghe e laboriose resuspensions di fibrille. Qui, descriviamo un mezzo per purificare COL1 da piccole biopsie dermici in meno di 3 ore.

Un metodo migliore per la preparazione di tipo I collagene della pelle

Soluble type 1 collagen (COL1) is used extensively as an adhesive substrate for cell cultures and as a cellular scaffold for regenerative applications. ...

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Bioengineering

22.7K Views.  Boston Children's Hospital.  Procedure tradizionali per l'isolamento di tipo solubile 1 del collagene (COL1) richiedono circa 10 giorni dall'inizio alla fine a causa di incubazione tampone lunghe e laboriose resuspensions di fibrille. Qui, descriviamo un mezzo per purificare COL1 da piccole biopsie dermici in meno di 3 ore. 

Video: An Improved Method for the Preparation of Type I Collagen From Skin

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.

Organotipiche Collagene I test: una piattaforma malleabile per valutare Comportamento cella in un 3-dimensionale Contesto

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

Ricerca

Bioingegneria

Improved Method for the Preparation of a Human Cell-based, Contact Model of the Blood-Brain Barrier

The blood-brain barrier (BBB) comprises impermeable but adaptable brain capillaries which tightly control the brain environment. Failure of the BBB has been implied in the etiology of many brain pathologies, creating a need for development of human in vitro BBB models to assist in clinically-relevant research. Among the numerous BBB models thus far described, a static (without flow), contact BBB model, where astrocytes and brain endothelial cells (BECs) are cocultured on the opposite sides of a porous membrane, emerged as a simplified yet authentic system to simulate the BBB with high throughput screening capacity. Nevertheless the generation of such model presents few technical challenges. Here, we describe a protocol for preparation of a contact human BBB model utilizing a novel combination of primary human BECs and immortalized human astrocytes. Specifically, we detail an innovative method for cell-seeding on inverted inserts as well as specify insert staining techniques and exemplify how we use our model for BBB-related research.

Establishment of human models of the blood-brain barrier (BBB) can benefit research into brain conditions associated with BBB failure. We describe here an improved technique for preparation of a contact BBB model, which permits coculturing of human astrocytes and brain endothelial cells on the opposite sides of a porous membrane.

Migliorata metodo per la preparazione di un cell-based, Contact modello umano della barriera sanguigna del cervello

The blood-brain barrier (BBB) comprises impermeable but adaptable brain capillaries which tightly control the brain environment. Failure of the BBB has ...

An Improved Mechanical Testing Method to Assess Bone-implant Anchorage

Recent advances in material science have led to a substantial increase in the topographical complexity of implant surfaces, both on a micro- and a nano-scale. As such, traditional methods of describing implant surfaces -&#160;namely numerical determinants of surface roughness -&#160;are inadequate for predicting in vivo performance. Biomechanical testing provides an accurate and comparative platform to analyze the performance of biomaterial surfaces. An improved mechanical testing method to test the anchorage of bone to candidate implant surfaces is presented. The method is applicable to both early and later stages of healing and can be employed for any range of chemically or mechanically modified surfaces -&#160;but not smooth surfaces. Custom rectangular implants are placed bilaterally in the distal femora of male Wistar rats and collected with the surrounding bone. Test specimens are prepared and potted using a novel breakaway mold and the disruption test is conducted using a mechanical testing machine. This method allows for alignment of the disruption force exactly perpendicular, or parallel, to the plane of the implant surface, and provides an accurate and reproducible means for isolating an exact peri-implant region for testing.

An improved method to mechanically test bone anchorage to candidate implant surfaces is presented. This method allows for alignment of the disruption force exactly perpendicular, or parallel, to the plane of the implant surface, and provides an accurate means to direct the disruption forces to an exact peri-implant region.

Una migliorata meccanica metodo di prova per valutare osso-impianto Anchorage

Recent advances in material science have led to a substantial increase in the topographical complexity of implant surfaces, both on a micro- and a ...

Engineering 3D Cellularized Collagen Gels for Vascular Tissue Regeneration

Synthetic materials are known to initiate clinical complications such as inflammation, stenosis, and infections when implanted as vascular substitutes. Collagen has been extensively used for a wide range of biomedical applications and is considered a valid alternative to synthetic materials due to its inherent biocompatibility (i.e., low antigenicity, inflammation, and cytotoxic responses). However, the limited mechanical properties and the related low hand-ability of collagen gels have hampered their use as scaffold materials for vascular tissue engineering. Therefore, the rationale behind this work was first to engineer cellularized collagen gels into a tubular-shaped geometry and second to enhance smooth muscle cells driven reorganization of collagen matrix to obtain tissues stiff enough to be handled.
The strategy described here is based on the direct assembling of collagen and smooth muscle cells (construct) in a 3D cylindrical geometry with the use of a molding technique. This process requires a maturation period, during which the constructs are cultured in a bioreactor under static conditions (without applied external dynamic mechanical constraints) for 1 or 2 weeks. The &#8220;static bioreactor&#8221; provides a monitored and controlled sterile environment (pH, temperature, gas exchange, nutrient supply and waste removal) to the constructs. During culture period, thickness measurements were performed to evaluate the cells-driven remodeling of the collagen matrix, and glucose consumption and lactate production rates were measured to monitor the cells metabolic activity. Finally, mechanical and viscoelastic properties were assessed for the resulting tubular constructs. To this end, specific protocols and a focused know-how (manipulation, gripping, working in hydrated environment, and so on) were developed to characterize the engineered tissues.

In this work, we present a technique for the rapid fabrication of living vascular tissues by direct culturing of collagen, smooth muscle cells and endothelial cells. In addition, a new protocol for the mechanical characterization of engineered vascular tissues is described.

Ingegneria 3D Cellularized collagene Gel per Vascolare Rigenerazione Tissutale

Synthetic materials are known to initiate clinical complications such as inflammation, stenosis, and infections when implanted as vascular substitutes. ...

Minced Tissue in Compressed Collagen: A Cell-containing Biotransplant for Single-staged Reconstructive Repair

Conventional techniques for cell expansion and transplantation of autologous cells for tissue engineering purposes can take place in specially equipped human cell culture facilities. These methods include isolation of cells in single cell suspension and several laborious and time-consuming events before transplantation back to the patient. Previous studies suggest that the body itself could be used as a bioreactor for cell expansion and regeneration of tissue in order to minimize ex vivo manipulations of tissues and cells before transplanting to the patient. The aim of this study was to demonstrate a method for tissue harvesting, isolation of continuous epithelium, mincing of the epithelium into small pieces and incorporating them into a three-layered biomaterial. The three-layered biomaterial then served as a delivery vehicle, to allow surgical handling, exchange of nutrition across the transplant, and a controlled degradation. The biomaterial consisted of two outer layers of collagen and a core of a mechanically stable and slowly degradable polymer. The minced epithelium was incorporated into one of the collagen layers before transplantation. By mincing the epithelial tissue into small pieces, the pieces could be spread and thereby the propagation of cells was stimulated. After the initial take of the transplants, cell expansion and reorganization would take place and extracellular matrix mature to allow ingrowth of capillaries and nerves and further maturation of the extracellular matrix. The technique minimizes ex vivo manipulations and allow cell harvesting, preparation of autograft, and transplantation to the patient as a simple one-stage intervention. In the future, tissue expansion could be initiated around a 3D mold inside the body itself, according to the specific needs of the patient. Additionally, the technique could be performed in an ordinary surgical setting without the need for sophisticated cell culturing facilities.

Tissue engineering often includes in vitro expansion in order to create autografts for tissue regeneration. In this study a method for tissue expansion, regeneration, and reconstruction in vivo was developed in order to minimize the processing of cells and biological materials outside the body.

Tissue tritata in Compressed Collagene: A Biotransplant cellulare contenente per la riparazione singolo-messa in scena Ricostruttiva

Conventional techniques for cell expansion and transplantation of autologous cells for tissue engineering purposes can take place in specially equipped ...

Preparation of 3D Collagen Gels and Microchannels for the Study of 3D Interactions In Vivo

Historically, most cellular processes have been studied in only 2 dimensions. While these studies have been informative about general cell signaling mechanisms, they neglect important cellular cues received from the structural and mechanical properties of the local microenvironment and extracellular matrix (ECM). To understand how cells interact within a physiological ECM, it is important to study them in the context of 3 dimensional assays. Cell migration, cell differentiation, and cell proliferation are only a few processes that have been shown to be impacted by local changes in the mechanical properties of a 3-dimensional ECM. Collagen I, a core fibrillar component of the ECM, is more than a simple structural element of a tissue. Under normal conditions, mechanical cues from the collagen network direct morphogenesis and maintain cellular structures. In diseased microenvironments, such as the tumor microenvironment, the collagen network is often dramatically remodeled, demonstrating altered composition, enhanced deposition and altered fiber organization. In breast cancer, the degree of fiber alignment is important, as an increase in aligned fibers perpendicular to the tumor boundary has been correlated to poorer patient prognosis1. Aligned collagen matrices result in increased dissemination of tumor cells via persistent migration2,3. The following is a simple protocol for embedding cells within a 3-dimensional, fibrillar collagen hydrogel. This protocol is readily adaptable to many platforms, and can reproducibly generate both aligned and random collagen matrices for investigation of cell migration, cell division, and other cellular processes in a tunable, 3-dimensional, physiological microenvironment.

Preparation of 3D Collagen Gels and Microchannels for the Study of 3D Interactions In Vivo

Collagen is a core component of the ECM, and provides essential cues for several cellular processes ranging from migration to differentiation and proliferation. Provided here is a protocol for embedding cells within 3D collagen hydrogels, and a more advanced technique for generating randomized or aligned collagen matrices using PDMS microchannels.

Preparazione del 3D collagene Gel e microcanali per lo studio delle interazioni 3D<em&gt; In Vivo</em

Historically, most cellular processes have been studied in only 2 dimensions.  While these studies have been informative about general cell signaling ...

Evaluation of Keratinocyte Proliferation on Two- and Three-dimensional Type I Collagen Substrates

Type I collagen, useful as a substrate for cell culture, exists in two forms: the two-dimensional, non-fibrous form and three-dimensional, fibril form. Both forms can be prepared with the same type I collagen. In general, the non-fibrous form promotes cell adhesion and proliferation. The fibril form (gels) provides more physiological conditions in many types of cells; therefore, gel culture is useful for examining physiological behaviors of cells, such as drug efficacy.
Researchers can select the appropriate form according to the purpose of its use. For example, in the case of keratinocytes, on-gel culture has been used as a wound healing model. FEPE1L-8, a keratinocyte cell line cultured on the non-fibrous form of type I collagen, promote cell adhesion. Notably, keratinocyte proliferation is slower on the fibril form than the non-fibrous form. Protocols for the preparation of type I collagen for cell culture are simple and have wide applications depending on the experimental needs.

Here, we present a protocol for the preparation of two different forms of culture substrates utilizing type I collagen. Depending on how collagen is handled, collagen molecules either maintain two-dimensional, non-fibrous form or reassemble into three-dimensional, fibril form. Cell proliferation on type I collagen is drastically affected by fibril formation.

Valutazione della proliferazione dei cheratinociti su bi - e tri - dimensionale substrati di collagene di tipo I

Type I collagen, useful as a substrate for cell culture, exists in two forms: the two-dimensional, non-fibrous form and three-dimensional, fibril form. ...

Simultaneous Quantification of Selected Kynurenines Analyzed by Liquid Chromatography-Mass Spectrometry in Medium Collected from Cancer Cell Cultures

The kynurenine pathway and the tryptophan catabolites called kynurenines have received increased attention for their involvement in immune regulation and cancer biology. An in vitro cell culture assay is often used to learn about the contribution of different tryptophan catabolites in a disease mechanism and for testing therapeutic strategies. Cell culture medium that is rich in secreted metabolites and signaling molecules reflects the status of tryptophan metabolism and other cellular events. New protocols for the reliable quantification of multiple kynurenines in the complex cell culture medium are desired to allow for a reliable and quick analysis of multiple samples. This can be accomplished with liquid chromatography coupled with mass spectrometry. This powerful technique is employed in many clinical and research laboratories for the quantification of metabolites and can be used for measuring kynurenines.
Presented here is the use of liquid chromatography coupled with single quadrupole mass spectrometry (LC-SQ) for the simultaneous determination of four kynurenines, i.e., kynurenine, 3-hydroxykynurenine, 3-hydroxyanthranilic, and xanthurenic acid in the medium collected from in vitro cultured cancer cells. SQ detector is simple to use and less expensive compared to other mass spectrometers. In the SQ-MS analysis, multiple ions from the sample are generated and separated according to their specific mass-to-charge ratio (m/z), followed by the detection using a Single Ion Monitoring (SIM) mode.
This paper draws the attention on the advantages of the reported method and indicates some weak points. It is focused on critical elements of LC-SQ analysis including sample preparation along with chromatography and mass spectrometry analysis. The quality control, method calibration conditions and matrix effect issues are also discussed. We described a simple application of 3-nitrotyrosine as one analog standard for all target analytes. As confirmed by experiments with human ovary and breast cancer cells, the proposed LC-SQ method&#160;generates reliable results and can be further applied to other in vitro cellular models.

Described here is a protocol for the determination of four different tryptophan metabolites generated in the kynurenine pathway (kynurenine, 3-hydroxykynurenine, xanthurenic acid, 3-hydroxyanthranilic acid) in the medium collected from cancer cell cultures analyzed by liquid chromatography coupled with a single quadrupole mass spectrometry.

Quantificazione simultanea di kynurenine selezionate analizzate dalla cromatografia liquida-spettrometria di massa in mezzo raccolto da colture cellulari tumorali

The kynurenine pathway and the tryptophan catabolites called kynurenines have received increased attention for their involvement in immune regulation and ...

Un nuovo metodo di iniezione lenta minimamente invasivo per ridurre le lesioni tissutali

A Novel Cell Injection Method with Minimum Invasion

Directly injecting cells into tissues is a necessary process in cell administration and/or replacement therapy. The cell injection requires a sufficient amount of suspension solution to allow the cells to enter the tissue. The volume of the suspension solution affects the tissue, and this can cause major invasive injury as a result of the cell injection. This paper reports on a novel cell injection method, called slow injection, that aims to avoid this injury. However, pushing out the cells from the needle tip requires a sufficiently high injection speed according to Newton's law of shear force. To solve the above contradiction, a non-Newtonian fluid, such as gelatin solution, was used as the cell suspension solution in this work. Gelatins solution have temperature sensitivity, as their form changes from gel to sol at approximately 20 &#176;C. Therefore, to maintain the cell suspension solution in the gel form, the syringe was kept cooled in this protocol; however, once the solution was injected into the body, the body temperature converted it to a sol. The interstitial tissue fluid flow can absorb excess solution. In this work, the slow injection technique allowed cardiomyocyte balls to enter the host myocardium and engraft without surrounding fibrosis. This study employed a slow injection method to inject purified and ball-formed neonatal rat cardiomyocytes into a remote area of myocardial infarction in the adult rat heart. At 2 months following the injection, the hearts of the transplanted groups showed significantly improved contractile function. Furthermore, histological analyses of the slow-injected hearts revealed seamless connections between the host and graft cardiomyocytes via intercalated disks containing gap junction connections. This method could contribute to next-generation cell therapies, particularly in cardiac regenerative medicine.

Autore in primo piano: un nuovo metodo di iniezione cellulare con un'invasione minima  

This method eliminates any major invasion during cell injections caused by the cell suspension solution.

Un nuovo metodo di iniezione cellulare con un'invasione minima

Directly injecting cells into tissues is a necessary process in cell administration and/or replacement therapy. The cell injection requires a sufficient ...