Unsere Forschung wird durch die Interne Research Program des NIH, National Eye Institute unterstützt.

Alle Geräte und Reagenzien sind steril. Das Protokoll wurde von der Animal Care genehmigt und Verwenden Committee (ACUC) an der NEI / NIH (Tier Studienprotokoll NEI-553), und wurde nach den NIH-Richtlinien und Vorschriften durchgeführt. 1. Die Herstellung der angiogenen Faktor-haltigen Pellets In diesem Teil werden die Pellets mit dem angiogenen Faktor des Interesses vorbereitet. <ol><li> Machen Sie 10% (w / v) Sucralfat Lösung mit PBS. Shop unter Raumtemperatur. </li><li> Machen Sie 12% (w / v) Poly-HEMA mit absolutem Ethanol. Shop unter Raumtemperatur. </li><li> Machen Sie 1 ug / ul bFGF-Lösung. Shop in -80 ° C. </li><li> Um machen 50 Pellets, mix 5 ul der Poly-HEMA, 1μl von Sucralfat und 4 ul bFGF Stammlösung, gründlich vortexen. </li><li> Legen Sie ein Stück sauberer Parafilm in einer Petri-Schale, setzen Sie es unter UV-Licht für 15 min in einer Gewebekultur Kapuze. Drop 0,2 ul der Lösung Mischung auf dem Parafilm für ein Pellet. So sollten 10 ul der Lösung Mischung Ausbeute 50 Pellets. Lassen Sie die Pellets trocken und bei Raumtemperatur für 1-2 Stunden. Die getrockneten Pellets können in 4 ° C mehrere Tage oder -80 ° C für mehrere Monate gelagert werden. </li><li> Nach Gebrauch, hebeln und holen die Pellets mit den Spitzen einer Pinzette. Seien Sie besonders vorsichtig, sie nicht zu brechen oder machen sie Frühjahr entfernt. </li></ol> 2. Durchführen der Maus Hornhaut Tasche Test In diesem Teil werden wir demonstrieren, wie man eine Tasche in der Maus Hornhaut zu machen, und wie man ein Pellet in die Tasche legen. Die angiogenen Faktor im Pellet wird nach und nach in die Umgebung der Hornhaut (Abb. 1) freigesetzt werden. In dieser Demonstration verwenden wir 8-wöchigen weiblichen C57/BL6-Mäusen. <ol><li> Die Maus ist sehr systematisch betäubt mit der Mischung aus Ketamin (75 mg / kg) und Xylazin (5mg/kg, ip-Injektion). Dies wird mit der Maus unter Narkose Zustand zu halten für 30-60 min. Lokalanästhetikum (0,5% Proparacain HCl) ist die Hornhaut aufgetragen. Nach 5 min, fix ein Auge unter einem Binokular. </li><li> Eine sehr sanfte Schnitt ist in der Mitte der Hornhaut 1,2 -1,4 mm vom Limbus corneae (wie in Abbildung 1 dargestellt) mit einem von Graefe Staarmesser gemacht. Seien Sie besonders vorsichtig, um nicht durch die Hornhaut geschnitten. </li><li> Eine Tasche ist unter dem Epithel der Hornhaut durch horizontal Einsetzen des Messers in die Mitte der Hornhaut und zur Verlängerung der Messer gegen den Limbus sorgfältig (Abb. 1) hergestellt. Die Größe der Tasche hat, um groß genug sein, zu einer angiogenen Faktor-haltigen Pellets unterzubringen. Seien Sie äußerst vorsichtig, um die Punktion durch die Hornhaut. </li><li> Legen Sie eine Tablette mit einer Pinzette in die Tasche langsam. Versuchen Sie, das Pellet so flach wie möglich zu machen. </li><li> Nach der Implantation des Pellets, ist eine topische ophthalmologische antibiotische Salbe auf das Auge angewendet. Die Geräte sind mit 70% Alkohol-Pads zwischen Tieren vernichtet. </li><li> Bewegen Sie die Maus an einen warmen und trockenen Ort und überwachen sie, bis sie in der Lage, eine aufrechte Haltung zu bewahren und dann wieder in seine Heimat Käfig ist. Systemische Analgetika (z. B. Buprenorphin, 2 mg / kg, ip-Injektion) und topische Antibiotika-Salbe (zB Gentamicin) werden zweimal täglich für 2 Tage nach der Operation gegeben und die Maus ist eng für 3 Tage überwacht. Healing wird voraussichtlich innerhalb der ersten 48 Stunden nach der Operation abgeschlossen ist. Das Auge mit der Tasche unter einer Spaltlampe BioMicro Umfang zwischen den Tagen 4-10 nach Pellet-Implantation untersucht werden. </li></ol> 3. Repräsentative Ergebnisse <ol><li> Sieben Tage nach der Pellet-Implantation, wird die Maus narkotisiert systemisch und topisch, wie in 2.1 beschrieben. </li><li> Beachten Sie die Blutgefäße in der Hornhaut von der angiogenen Faktor unter einem Binokular induziert. In der Hornhaut mit Vehikel behandelt, kann kein Wachstum von Blutgefäßen beobachtet (Abb. 2A, Vehikel-behandelten Hornhaut) werden. In der Hornhaut mit bFGF behandelt wird, kann robust Angiogenese beobachtet (Abb. 2B). Das Wachstum von Blutgefäßen, kann unter Verwendung der maximalen Länge der Blutgefäße (von der normalen Limbus Schiffe an die Spitze der neuen Schiffe), und die gesamte Blutgefäß Bereiche (Abb. 2B, abgegrenzt mit einem roten gestrichelten Linie in der bFGF werden Hornhaut)-behandelt. Andere Quantifizierungsmethoden wurden ebenfalls 2,5 beschrieben. </li></ol><img src="/files/ftp_upload/3077/3077fig1.jpg" alt="Abbildung 1" /> Abbildung 1. A. Normale Hornhaut mit H &amp; E Färbung. Kein Blutgefäß besteht in einer normalen Hornhaut. B. Machen Sie eine Tasche unter dem Epithel der Hornhaut. C. Embed ein Pellet in die Tasche. D. Die angiogenen Faktor ist aus dem Pellet freigesetzt und neue Blutgefäße wachsen von der normalen Limbus Schiffe. <img src="/files/ftp_upload/3077/3077fig2.jpg" alt="Abbildung 2" /> Abbildung 2. Repräsentatives Ergebnis fünf Tage nach imPlantage des Pellets. A. Cornea mit einem Pellet das Fahrzeug nur. Keine Bildung neuer Blutgefässe in der Hornhaut. Nur die bereits vorhandenen normalen Limbus Schiffe zu sehen sind. B. Cornea mit einem Pellet bFGF. Robust neuer Blutgefäße (dot gesäumten) wuchs von den bereits bestehenden normalen Limbus Schiffe.

<ol>
	<li>Cao, Y., Linden, P., Shima, D., Browne, F., Folkman, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=In+vivo+angiogenic+activity+and+hypoxia+induction+of+heterodimers+of+placenta+growth+factor/vascular+endothelial+growth+factor.">In vivo angiogenic activity and hypoxia induction of heterodimers of placenta growth factor/vascular endothelial growth factor.</a> The Journal of clinical investigation. 98, 2507-2511 (1996).</li><li>Rogers, M. S., Birsner, A. E., D'Amato, R. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+mouse+cornea+micropocket+angiogenesis+assay.">The mouse cornea micropocket angiogenesis assay.</a> Nature. 2, 2545-2550 (2007).</li><li>Poche, R. A., Saik, J. E., West, J. L., Dickinson, M. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+mouse+cornea+as+a+transplantation+site+for+live+imaging+of+engineered+tissue+constructs.">The mouse cornea as a transplantation site for live imaging of engineered tissue constructs.</a> Cold Spring Harbor protocols. , 5416-54 (2010).</li><li>Zhang, F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=VEGF-B+is+dispensable+for+blood+vessel+growth+but+critical+for+their+survival,+and+VEGF-B+targeting+inhibits+pathological+angiogenesis.">VEGF-B is dispensable for blood vessel growth but critical for their survival, and VEGF-B targeting inhibits pathological angiogenesis.</a> Proceedings of the National Academy of Sciences of the United States of America. , 106-6152 (2009).</li><li>Tong, S., Yuan, F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Dose+response+of+angiogenesis+to+basic+fibroblast+growth+factor+in+rat+corneal+pocket+assay:+I.+Experimental+characterizations.">Dose response of angiogenesis to basic fibroblast growth factor in rat corneal pocket assay: I. Experimental characterizations.</a> Microvascular research. 75, 10-15 (2008).</li><li>Muthukkaruppan, V., Auerbach, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Angiogenesis+in+the+mouse+cornea.">Angiogenesis in the mouse cornea.</a> Science. 205, 1416-1418 (1979).</li><li>Ziche, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Corneal+assay+for+angiogenesis.">Corneal assay for angiogenesis.</a> Methods in molecular medicine. 46, 131-142 (2001).</li><li>Ziche, M., Morbidelli, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+corneal+pocket+assay.">The corneal pocket assay.</a> Methods in molecular biology. 467, 319-329 (2009).</li></ol>

Keine Interessenskonflikte erklärt.

Die Maus Hornhaut Tasche Test-Modell wurde erstmals 1979 von Muthukkaruppan VR und Auerbach R 6 beschrieben. Detaillierte Protokolle wurden von verschiedenen Labors 2,3,7,8 veröffentlicht worden. Unser Labor hat modifiziert und verwendet diese Methode in unsere Studien seit vielen Jahren 4. Die Maus Hornhaut pocket-Assay ist ein relativ einfaches Modell mit großer Reproduzierbarkeit. Ein weiterer Vorteil dieses Modells ist, dass da die Hornhaut in der Regel fehlt Blutgefäße, gibt es ...

<table border="1"><tbody><tr><th> Ausstattung </th><th> Firma </th><th> Katalog-Nummer </th></tr><tr><td> Präpariermikroskop </td><td> World Precision Instruments </td><td> PZMIV-BS </td></tr><tr><td> Von Graefe Staarmesser (1.5x25mm Klinge, flach) </td><td> Ambler Surgical </td><td> 3401E </td></tr><tr><td> Dumont Nr. 5 Zangen </td><td> Feine Science Tools </td><td> 11252-50 </td></tr><tr><td> Spaltlampe </td><td> Zeiss </td><td> 30 SL-M </td></tr></tbody></table> Tabelle 1. Ausrüstungen <table border="1"><tbody><tr><th> Reagens </th><th> Firma </th><th> Catalog # </th><th> Kommentare </th></tr><tr><td> bFGF (basischer Fibroblasten-Wachstumsfaktor) </td><td> PeproTech INC </td><td> 100-18B </td><td></td></tr><tr><td> Sucralfat (Saccharose octasulfate-Aluminium-Komplex) </td><td> Sigma </td><td> S0652 </td><td> 10% in PBS </td></tr><tr><td> Poly-HEMA (Poly (2-Hydroxyethylmethacrylat)) </td><td> Sigma </td><td> P3932 </td><td> 12% in Ethanol </td></tr></tbody></table> Tabelle 2. Reagenzien und Materialien

a mouse model of the cornea pocket assay for angiogenesis study

Eine normale Hornhaut ist klar, der vaskulären Gewebe. Allerdings kann die Blutgefäße induziert, zu wachsen und in der Hornhaut, wenn potente angiogene Faktoren 1 verabreicht werden überleben. Diese Einzigartigkeit hat die Hornhaut Tasche Assay eine der am häufigsten verwendeten Modelle zur Angiogenese-Studien. Die Hornhaut komponiert mehrere Schichten von Zellen. Es ist daher möglich, ein Pellet mit der angiogenen Faktor des Interesses an der Hornhaut, um seine angiogene Wirkung 2,3 untersuchen einbinden. Hier bieten wir Ihnen eine Schritt für Schritt Demonstration, wie man (I) produzieren die angiogenen Faktor-haltige Pellet (II) betten die Pellets in die Hornhaut (III) eine Analyse der Angiogenese durch den angiogenen Faktor von Interesse induziert. Da die basischen Fibroblasten-Wachstumsfaktor (bFGF) als einer der stärksten angiogenen Faktoren 4 bekannt ist, ist es hier, die Angiogenese in der Hornhaut zu induzieren.

Watch this Scientific Journal Video about A Mouse Model of the Cornea Pocket Assay for Angiogenesis Study at JoVE.com

A Mouse Model of the Cornea Pocket Assay for Angiogenesis Study

Die Hornhaut ist einzigartig, es fehlt Gefäßgewebe. Allerdings kann robuste Wachstum der Blutgefäße und das Überleben in der Hornhaut durch potente angiogenen Faktoren ausgelöst werden. Daher kann die Hornhaut mit uns ein wertvolles Instrument für die angiogenen Studien. Dieses Protokoll zeigt, wie die Maus-Modell der Hornhaut Tasche Test und wie die Angiogenese durch angiogene Faktoren mit diesem Modell induziert Beurteilung durchzuführen.

Ein Maus-Modell der Cornea Pocket-Assay für die Angiogenese-Studie

A normal cornea is clear of vascular tissues. However, blood vessels can be induced to grow and survive in the cornea when potent angiogenic factors are ...

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16.0K Aufrufe.  National Eye Institute. Die Hornhaut ist einzigartig, es fehlt Gefäßgewebe. Allerdings kann robuste Wachstum der Blutgefäße und das Überleben in der Hornhaut durch potente angiogenen Faktoren ausgelöst werden. Daher kann die Hornhaut mit uns ein wertvolles Instrument für die angiogenen Studien. Dieses Protokoll zeigt, wie die Maus-Modell der Hornhaut Tasche Test und wie die Angiogenese durch angiogene Faktoren mit diesem Modell induziert Beurteilung durchzuführen.

Serie: A Mouse Model of the Cornea Pocket Assay for Angiogenesis Study

Biomarkers in an Animal Model for Revealing Neural, Hematologic, and Behavioral Correlates of PTSD

Identification of biomarkers representing the evolution of the pathophysiology of Post Traumatic Stress Disorder (PTSD) is vitally important, not only for objective diagnosis but also for the evaluation of therapeutic efficacy and resilience to trauma. Ongoing research is directed at identifying molecular biomarkers for PTSD, including traumatic stress induced proteins, transcriptomes, genomic variances and genetic modulators, using biologic samples from subjects' blood, saliva, urine, and postmortem brain tissues. However, the correlation of these biomarker molecules in peripheral or postmortem samples to altered brain functions associated with psychiatric symptoms in PTSD remains unresolved. Here, we present an animal model of PTSD in which both peripheral blood and central brain biomarkers, as well as behavioral phenotype, can be collected and measured, thus providing the needed correlation of the central biomarkers of PTSD, which are mechanistic and pathognomonic but cannot be collected from people, with the peripheral biomarkers and behavioral phenotypes, which can.
Our animal model of PTSD employs restraint and tail shocks repeated for three continuous days - the inescapable tail-shock model (ITS) in rats. This ITS model mimics the pathophysiology of PTSD 17, 7, 4, 10. We and others have verified that the ITS model induces behavioral and neurobiological alterations similar to those found in PTSD subjects 17, 7, 10, 9. Specifically, these stressed rats exhibit (1) a delayed and exaggerated startle response appearing several days after stressor cessation, which given the compressed time scale of the rat's life compared to a humans, corresponds to the one to three months delay of symptoms in PTSD patients (DSM-IV-TR PTSD Criterian D/E 13), (2) enhanced plasma corticosterone (CORT) for several days, indicating compromise of the hypothalamopituitary axis (HPA), and (3) retarded body weight gain after stressor cessation, indicating dysfunction of metabolic regulation.
The experimental paradigms employed for this model are: (1) a learned helplessness paradigm in the rat assayed by measurement of acoustic startle response (ASR) and a charting of body mass; (2) microdissection of the rat brain into regions and nuclei; (3) enzyme-linked immunosorbent assay (ELISA) for blood levels of CORT; (4) a gene expression microarray plus related bioinformatics tools 18. This microarray, dubbed rMNChip, focuses on mitochondrial and mitochondria-related nuclear genes in the rat so as to specifically address the neuronal bioenergetics hypothesized to be involved in PTSD.

We describe a rat model of post traumatic stress disorder (PTSD) that reveals the persistent alterations in neuroendocrine function and the delayed long-term, exaggerated fear response, characteristic of PTSD patients. The animal model and methods described here are useful for correlating biomarkers in brain nuclei, which are mechanistic but cannot be measured in patients, with biomarkers in peripheral white blood cells, which can.

Biomarker in einem Tiermodell für die Aufdeckung Neural, hämatologischen und Behavioral Korrelate der PTSD

Identification of biomarkers representing the evolution of the pathophysiology of Post Traumatic Stress Disorder (PTSD) is vitally important, not only for ...

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Medizin

Human Neuroendocrine Tumor Cell Lines as a Three-Dimensional Model for the Study of Human Neuroendocrine Tumor Therapy

Neuroendocrine tumors (NETs) are rare tumors, with an incidence of two per 100,&#x200A;000 individuals per year, and they account for 0.5% of all human malignancies.1 Other than surgery for the minority of patients who present with localized disease, there is little or no survival benefit of systemic therapy. Therefore, there is a great need to better understand the biology of NETs, and in particular define new therapeutic targets for patients with nonresectable or metastatic neuroendocrine tumors. 3D cell culture is becoming a popular method for drug screening due to its relevance in modeling the in vivo tumor tissue organization and microenvironment.2,3 The 3D multicellular spheroids could provide valuable information in a more timely and less expensive manner than directly proceeding from 2D cell culture experiments to animal (murine) models.
To facilitate the discovery of new therapeutics for NET patients, we have developed an in vitro 3D multicellular spheroids model using the human NET cell lines. The NET cells are plated in a non-adhesive agarose-coated 24-well plate and incubated under physiological conditions (5% CO2, 37 &deg;C) with a very slow agitation for 16-24 hr after plating. The cells form multicellular spheroids starting on the 3rd or 4th day. The spheroids become more spherical by the 6th day, at which point the drug treatments are initiated. The efficacy of the drug treatments on the NET spheroids is monitored based on the morphology, shape and size of the spheroids with a phase-contrast light microscope. The size of the spheroids is estimated automatically using a custom-developed MATLAB program based on an active contour algorithm. Further, we demonstrate a simple method to process the HistoGel embedding on these 3D spheroids, allowing the use of standard histological and immunohistochemical techniques. 
This is the first report on generating 3D spheroids using NET cell lines to examine the effect of therapeutic drugs. We have also performed histology on these 3D spheroids, and displayed an example of a single drug's effect on growth and proliferation of the NET spheroids. Our results support that the NET spheroids are valuable for further studies of NET biology and drug development.

We present a simple agarose overlay platform to grow 3D multicellular spheroids using neuroendocrine cancer cell lines. This method provides a very convenient way to examine the effect of therapeutic drugs on the neuroendocrine tumor cells. It could also help us establish human neuroendocrine tumor spheroids for cancer therapy.

Menschliche neuroendokrinen Tumor-Zelllinien als dreidimensionales Modell für das Studium der menschlichen neuroendokrinen Tumor-Therapie

Neuroendocrine tumors (NETs) are rare tumors, with an incidence of two per 100,&#x200A;000 individuals per year, and they account for 0.5% of all human ...

A Murine Model of Stent Implantation in the Carotid Artery for the Study of Restenosis

Despite the considerable progress made in the stent development in the last decades, cardiovascular diseases remain the main cause of death in western countries. Beside the benefits offered by the development of different drug-eluting stents, the coronary revascularization bears also the life-threatening risks of in-stent thrombosis and restenosis. Research on new therapeutic strategies is impaired by the lack of appropriate methods to study stent implantation and restenosis processes. Here, we describe a rapid and accessible procedure of stent implantation in mouse carotid artery, which offers the possibility to study in a convenient way the molecular mechanisms of vessel remodeling and the effects of different drug coatings.

A model of stent implantation in mouse carotid artery is described. Compared to other similar methods, this procedure is very rapid, simple and accessible, offering the possibility to study in a convenient way the vascular wall reaction to different drug-eluting stents and the molecular mechanisms of restenosis.

Ein Mausmodell der Stentimplantation in der Arteria carotis für das Studium der Restenose

Despite  the considerable progress made in the stent development in the last decades,  cardiovascular diseases remain the main cause of death in western ...

Retinal Detachment Model in Rodents by Subretinal Injection of Sodium Hyaluronate

Subretinal injection of sodium hyaluronate is a widely accepted method of inducing retinal detachment (RD). However, the height and duration of RD or the occurrence of subretinal hemorrhage can affect photoreceptor cell death in the detached retina. Hence, it is advantageous to create reproducible RDs without subretinal hemorrhage for evaluating photoreceptor cell death. We modified a previously reported method to create bullous and persistent RDs in a reproducible location with rare occurrence of subretinal hemorrhage. The critical step of this modified method is the creation of a self-sealing scleral incision, which can prevent leakage of sodium hyaluronate after injection into the subretinal space. To make the self-sealing scleral incision, a scleral tunnel is created, followed by scleral penetration into the choroid with a 30 G needle. Although choroidal hemorrhage may occur during this step, astriction with a surgical spear reduces the rate of choroidal hemorrhage. This method allows a more reproducible and reliable model of photoreceptor death in diseases that involve RD such as rhegmatogenous RD, retinopathy of prematurity, diabetic retinopathy, central serous chorioretinopathy, and age-related macular degeneration (AMD).

Creating experimental retinal detachments with a reproducible and sustained height of detachment, and without subretinal hemorrhage, is important for studying the pathophysiology of photoreceptor cell loss in retinal disease and evaluating potential therapeutic interventions. Here, we report such a method in detail.

Modell Netzhautablösung in Nagetiere durch subretinale Injektion von Natriumhyaluronat

Subretinal injection of sodium hyaluronate is a widely accepted method of inducing retinal detachment (RD). However, the height and duration of RD or the ...

Implantation of Fibrin Gel on Mouse Lung to Study Lung-specific Angiogenesis

Recent significant advances in stem cell research and bioengineering techniques have made great progress in utilizing biomaterials to regenerate and repair damage in simple tissues in the orthopedic and periodontal fields. However, attempts to regenerate the structures and functions of more complex three-dimensional (3D) organs such as lungs have not been very successful because the biological processes of organ regeneration have not been well explored. It is becoming clear that angiogenesis, the formation of new blood vessels, plays key roles in organ regeneration. Newly formed vasculatures not only deliver oxygen, nutrients and various cell components that are required for organ regeneration but also provide instructive signals to the regenerating local tissues. Therefore, to successfully regenerate lungs in an adult, it is necessary to recapitulate the lung-specific microenvironments in which angiogenesis drives regeneration of local lung tissues. Although conventional in vivo angiogenesis assays, such as subcutaneous implantation of extracellular matrix (ECM)-rich hydrogels (e.g., fibrin or collagen gels or Matrigel - ECM protein mixture secreted by Engelbreth-Holm-Swarm mouse sarcoma cells), are extensively utilized to explore the general mechanisms of angiogenesis, lung-specific angiogenesis has not been well characterized because methods for orthotopic implantation of biomaterials in the lung have not been well established. The goal of this protocol is to introduce a unique method to implant fibrin gel on the lung surface of living adult mouse, allowing for the successful recapitulation of host lung-derived angiogenesis inside the gel. This approach enables researchers to explore the mechanisms by which the lung-specific microenvironment controls angiogenesis and alveolar regeneration in both normal and pathological conditions. Since implanted biomaterials release and supply physical and chemical signals to adjacent lung tissues, implantation of these biomaterials on diseased lung can potentially normalize the adjacent diseased tissues, enabling researchers to develop new therapeutic approaches for various types of lung diseases.

Recapitulation of the organ-specific microenvironment, which stimulates local angiogenesis, is indispensable for successful regeneration of damaged tissues. This report demonstrates a novel method to implant fibrin gels on the lung surface of living mouse in order to explore how the lung-specific microenvironment modulates angiogenesis and alveolar regeneration in adult mouse.

Die Implantation von Fibrin Gel auf Maus Lung Lung spezifischen Angiogenese Studieren

Recent significant advances in stem cell research and bioengineering techniques have made great progress in utilizing biomaterials to regenerate and ...

Establishment of a Human Multiple Myeloma Xenograft Model in the Chicken to Study Tumor Growth, Invasion and Angiogenesis

Multiple myeloma (MM), a malignant plasma cell disease, remains incurable and novel drugs are required to improve the prognosis of patients. Due to the lack of the bone microenvironment and auto/paracrine growth factors human MM cells are difficult to cultivate. Therefore, there is an urgent need to establish proper in vitro and in vivo culture systems to study the action of novel therapeutics on human MM cells. Here we present a model to grow human multiple myeloma cells in a complex 3D environment in vitro and in vivo. MM cell lines OPM-2 and RPMI-8226 were transfected to express the transgene GFP and were cultivated in the presence of human mesenchymal cells and collagen type-I matrix as three-dimensional spheroids. In addition, spheroids were grafted on the chorioallantoic membrane (CAM) of chicken embryos and tumor growth was monitored by stereo fluorescence microscopy. Both models allow the study of novel therapeutic drugs in a complex 3D environment and the quantification of the tumor cell mass after homogenization of grafts in a transgene-specific GFP-ELISA. Moreover, angiogenic responses of the host and invasion of tumor cells into the subjacent host tissue can be monitored daily by a stereo microscope and analyzed by immunohistochemical staining against human tumor cells (Ki-67, CD138, Vimentin) or host mural cells covering blood vessels (desmin/ASMA).
In conclusion, the onplant system allows studying MM cell growth and angiogenesis in a complex 3D environment and enables screening for novel therapeutic compounds targeting survival and proliferation of MM cells.

Human multiple myeloma (MM) cells require the supportive microenvironment of mesenchymal cells and extracellular matrix components for survival and proliferation. We established an in vivo chicken embryo model with engrafted human myeloma and mesenchymal cells to study effects of cancer drugs on tumor growth, invasion and angiogenesis.

Einrichtung eines Menschen Multiple Myeloma Xenograftmodell im Huhn, das Tumorwachstum, Invasion und Angiogenese Studieren

Multiple myeloma (MM), a malignant plasma cell disease, remains incurable and novel drugs are required to improve the prognosis of patients. Due to the ...

Apical Resection Mouse Model to Study Early Mammalian Heart Regeneration

Cardiovascular disease plagues the whole world due to intensive lifestyle changes. Heart regeneration holds great promise for repairing and restoring cardiomyocytes lost due to injury and disease. In contrast to the robust cardiac regeneration of certain lower vertebrates, adult mammalian hearts typically show minimal capacity for heart regeneration and repair. However, recent studies have sparked considerable scientific interest with the finding that, between postnatal day 1 to 7 (P1 to P7), the neonatal mouse heart retains significant regenerative potential after apical resection (i.e., surgical amputation and exposure of left ventricular apex). One major controversy over this finding might be due to the diverse surgery-related procedures used in efforts to replicate or expand upon this important finding. These instructions dynamically present the materials and methodology for apical resection in a mouse model. The salient steps of this rodent survival surgery involve hypothermia anesthesia, thoracotomy, surgical amputation of heart ventricular apex, and suture and recovery of mice. The approach described could expand the application of the apical resection mouse model for cardiovascular research.

A step-by-step video protocol of apical resection is demonstrated in this study. Apical resection is a recently highlighted surgical approach in mammalian heart regeneration research. This study may promote the application of apical resection as a standard methodology in research into the mechanism underlying heart regeneration.

Wurzelspitzenresektion Mausmodell zur frühen Säugetierherzregeneration Studieren

Cardiovascular disease plagues the whole world due to intensive lifestyle changes. Heart regeneration holds great promise for repairing and restoring ...

Isometric Contractility Measurement of the Mouse Mesenteric Artery Using Wire Myography

The wire myograph technique is used to assess the contractility of vascular smooth muscles in response to depolarization, GPCR agonists/inhibitors and drugs. It is widely used in many studies on the physiological functions of vascular smooth muscle, the pathogenesis of vascular diseases such as hypertension, and the development of smooth muscle relaxant drugs. The mouse is a widely used model animal with a large pool of disease models and genetically modified strains. We introduced this method to measure the isometric contraction of mouse mesenteric artery in detail. A 1.4-mm segment of mouse mesenteric resistance artery was isolated and mounted on a myograph chamber by passing two steel wires through its lumen. After equilibration and normalization steps, the vessel segment was potentiated by a high-K+ solution twice prior to the contraction assay. As an example of the application of this method in drug development, we measured the relaxant effect of a novel natural substance, neoliensinine, isolated from a Chinese herb, embryos of the lotus seed (Nelumbo nucifera Gaertn.) on mouse mesenteric arteries. The vessel segments mounted on the myograph chamber were stimulated with a high-K+ solution. When the force tension reached a stable sustained phase, cumulative doses of neoliensinine were added to the chamber. We found that neoliensinine had a dose-dependent relaxant effect on smooth muscle contraction, thus suggesting that it bears potential activity against hypertension. In addition, as the vessel segment can survive at least 4 hours after mounting and maintain contractility induced by the high-K+ solution for many times, we suggest that the wire myograph system may be used for the time-consuming process of drug screening.

The wire myograph technique is used to investigate vascular smooth muscle functions and screen new drugs. We report a detailed protocol for measuring the isometric contractility of the mouse mesenteric artery and for screening new relaxants of vascular smooth muscle.

Messung der isometrischen Kontraktilität der Maus mesenterialen Arterie mit Draht Myographie

The wire myograph technique is used to assess the contractility of vascular smooth muscles in response to depolarization, GPCR agonists/inhibitors and ...

Corneal Epithelial Abrasion with Ocular Burr As a Model for Cornea Wound Healing

The murine cornea provides an excellent model to study wound healing. The cornea is the outermost layer of the eye, and thus is the first defense to injury. In fact, the most common type of eye injury found in clinic is a corneal abrasion. Here, we utilize an ocular burr to induce an abrasion resulting in removal of the corneal epithelium in vivo on anesthetized mice. This method allows for targeted and reproducible epithelial disruption, leaving other areas intact. In addition, we describe the visualization of the abraded epithelium with fluorescein staining and provide concrete advice on how to visualize the abraded cornea. Then, we follow the timeline of wound healing 0, 18, and 72 h after abrasion, until the wound is re-epithelialized. The epithelial abrasion model of corneal injury is ideal for studies on epithelial cell proliferation, migration and re-epithelialization of the corneal layers. However, this method is not optimal to study stromal activation during wound healing, because the ocular burr does not penetrate to the stromal cell layers. This method is also suitable for clinical applications, for example, pre-clinical test of drug effectiveness.

This protocol describes a method to inflict an abrasion to the ocular surface of the mouse, and to follow the wound healing process thereafter. The protocol takes advantage of an ocular burr to partially remove the surface epithelium of the eye in anaesthetized mice.

Epitheliale Korneaabnutzung mit okulärer Burr als Modell für die Hornhaut Wundheilung

The murine cornea provides an excellent model to study wound healing. The cornea is the outermost layer of the eye, and thus is the first defense to ...

Assessing Therapeutic Angiogenesis in a Murine Model of Hindlimb Ischemia

Critical limb ischemia (CLI) is a serious condition that entails a high risk of lower limb amputation. Despite revascularization being the gold-standard therapy, a considerable number of CLI patients are not suited for either surgical or endovascular revascularization. Angiogenic therapies are emerging as an option for these patients but are currently still under investigation. Before application in humans, those therapies must be tested in animal models and its mechanisms must be clearly understood. An animal model of hindlimb ischemia (HLI) has been developed by the ligation and excision of the distal external iliac and femoral arteries and veins in mice. A comprehensive panel of tests was assembled to assess the effects of ischemia and putative angiogenic therapies at functional, histologic and molecular levels. Laser Doppler was used for the flow measurement and functional assessment of perfusion. Tissue response was evaluated by the analysis of capillary density after staining with the anti-CD31 antibody on histological sections of gastrocnemius muscle and by measurement of collateral vessel density after diaphonization. Expression of angiogenic genes was quantified by RT-PCR targeting selected angiogenic factors exclusively in endothelial cells (ECs) after laser capture microdissection from mice gastrocnemius muscles. These methods were sensitive in identifying differences between ischemic and non-ischemic limbs and between treated and non-treated limbs. This protocol provides a reproducible model of CLI and a framework for testing angiogenic therapies.

Here, a critical hindlimb ischemia experimental model is presented followed by a battery of functional, histologic and molecular tests&#160;to assess the effectiveness of angiogenic therapies.&#8203;

Beurteilung der therapeutischen Angiogenese in einem Murine-Modell von Hindlimb Ischemia

Critical limb ischemia (CLI) is a serious condition that entails a high risk of lower limb amputation. Despite revascularization being the gold-standard ...