Questo lavoro è stato sostenuto dal KO1 NIDDK DK075386 concessione e l&#39;American Cancer Society RSG-09-075-01-MBC a giugno Dom

Questo protocollo comprende tre parti: rilevamento di coltura batterica, gavage mouse e Salmonella. 1. Salmonella condizione di crescita. <ol><li> Preparare la Salmonella brodo Luria-Bertani (LB) piastra, incubare a 37 ° C durante la notte. </li><li> Scegli un clone dalla piastra LB e mettere in 7 ml di LB in una provetta da 12 ml, e si agita a 37 ° C per circa 5 ore. </li><li> Inoculare 50 LB ml con 0,05 ml di una cultura fase stazionaria e incubare a 37 ° C senza agitazione per circa 18 ore. </li><li> Spin coltura batterica durante la notte a temperatura ambiente con 6000 rpm per 10 minuti, sospendere i batteri in HBSS con rapporto di 100:3 (LB: HBSS). Per esempio: Ogni cultura LB 50 ml saranno sospesi in 1,5 ml HBSS. </li><li> Per la sonda gastrica animale, diluire ulteriormente la coltura batterica in rapporto 1:10. Per esempio: Ogni 1,5 ml di coltura LB saranno sospesi in 15 ml HBSS. </li></ol> 2. Salmonella infezione modello *. <ol><li> Preparare la soluzione di streptomicina. Ogni mouse sarà dato 7,5 mg di streptomicina in 100 microlitri HBSS. Per esempio, preparare totale 90 mg di streptomicina in 1,2 ml di HBSS per 10 topi. Hanno sempre qualche volume in più quando si prepara la soluzione di streptomicina. </li><li> Prelevare acqua e cibo 4 ore prima della terapia orale sonda gastrica. </li><li> Topi sonda gastrica con streptomicina con 7,5 mg di streptomicina (100 ml di HBSS per topi di controllo). Afferra la pelle sopra la spalla del mouse saldamente con il pollice e il medio, allungare la testa e il collo con il dito indice per fare l&#39;esofago dritto. Diretto la palla-punta dell&#39;ago alimentazione lungo il tetto della bocca e verso il lato destro della parte posteriore della faringe, poi passare delicatamente giù nell&#39;esofago e iniettare i 100 ul di soluzione. Nessuna resistenza deve essere sentito. </li><li> A 20 ore dopo il trattamento streptomicina, acqua e cibo ritirato ancora prima che i topi infettati con batteri. </li><li> Gavage ogni mouse con 100 microlitri di sospensione HBSS o trattati con HBSS sterile (controllo) mediante sonda gastrica. La procedura di sonda gastrica è lo stesso 2.3) topi sonda gastrica con streptomicina. </li></ol> * Gli esperimenti sugli animali sono stati eseguiti utilizzando specifici-esenti da organismi patogeni C57BL femmina / 6 topi (Taconic, Hudson, NY) che sono stati 6-7 settimane di età come descritto in precedenza 1. Il protocollo è stato approvato dalla University of Rochester University commissione per le risorse animali (UCAR). 3. Rilevamento di Salmonella nell&#39;intestino. <ol><li> Raccogliere il mouse fecale (circa 100 mg). </li><li> Trasferimento del campione fecale di un tubo di 1,5 micro centrifuga con 1 ml di PBS e agitare vigorosamente. </li><li> Centrifugare per 10 min a 800 giri al minuto. Trasferire il supernatante in una provetta per microcentrifuga pulita. </li><li> Centrifugazione a 6000 rpm per 5 min. Sopranatante viene scartato e 200 ul PBS viene aggiunto al pellet e in agitazione. </li><li> Streak i 200 microlitri di PBS con una spatola cellulare usa e getta in un piatto BBL CHROMagar per rilevare Salmonella. Salmonella spp appaiono malva (rosa al viola, vedi Fig.1). Se 200 microlitri rendimenti troppe colonie sulla piastra, utilizzare 100 ul o 50 microlitri per la striscia. </li></ol> 4. Rappresentante dei risultati. Quando il protocollo è fatto correttamente, Salmonella typhimurium colonizzazione può essere rilevato nell&#39;intestino del mouse di oltre 6 mesi. Salmonella potrebbe essere rilevato dalla cultura fecali oltre 6 mesi (Fig.1). Come venire fuori tipico di questo modello, perdita di peso del corpo e la morte si verificano entro 4 settimane dopo l&#39;infezione. A seconda del ceppi di Salmonella usati per l&#39;infezione, alcuni topi potrebbe non sopravvivere più di 6 mesi. <img src="/files/ftp_upload/1947/1947fig1.jpg" alt="Figura 1" /> Figura 1. Salmonella intestinale nella specie Salmonella appaiono malva (rosa al viola) a colori, a causa delle differenze metaboliche, in presenza di cromogeni selezionati. Altri batteri sono o inibiti o producono colonie blu-verde o incolore. <img src="/files/ftp_upload/1947/1947fig2.jpg" alt="Figura 2" /> Figura 2. Proporzioni sopravvivenza dei topi infettati con il ceppo mutante di Salmonella PhoP c, c PhoP Avra-e PhoP AvrA-/AvrA + c, c PhoP Avra per 4 settimane (28 giorni). Tabella 1. Il peso corporeo dei topi infettati da salmonella per 4 settimane. <table border="1"><tbody><tr><td></td><td> 0 </td><td> 1 settimana </td><td> 2 settimane </td><td> 3 settimane </td><td> 4 settimane </td></tr><tr><td> controllo </td><td> 16,78 ± 1,05 </td><td> 16,91 ± 1,28 </td><td> 18,26 ± 1,23 </td><td> 19,31 ± 1,26 </td><td> 20,26 ± 1,15 </td></tr><tr><td> PhoP c </td&gt; <td> 16,89 ± 1,03 </td><td> 17,14 ± 1,19 </td><td> 17,43 ± 1,63 * </td><td> 18,68 ± 1,78 </td><td> 20,05 ± 1,11 </td></tr><tr><td> PhoP c Avra- </td><td> 16,91 ± 1,12 </td><td> 16,96 ± 1,39 </td><td> 17,06 ± 2,14 ** </td><td> 18,71 ± 2,18 </td><td> 20,15 ± 1,56 </td></tr><tr><td> PhoP c AvrA-/AvrA + </td><td> 16,94 ± 0,96 </td><td> 17,17 ± 1,02 </td><td> 17,63 ± 1,42 * </td><td> 18,44 ± 2,03 </td><td> 20,09 ± 1,17 </td></tr></tbody></table> * Rispetto al gruppo di controllo p &lt;0,05 ** Rispetto al gruppo di controllo p &lt;0,01 Tabella 2. Ceppi di Salmonella utilizzato in questo studio. <table border="1"><tbody><tr><td> Nome </td><td> Descrizione </td><td> Riferimento o fonte </td></tr><tr><td> Salmonella 14028s </td><td> Wild-type S. typhimurium </td><td> ATCC </td></tr><tr><td> PhoP c </td><td> Non patogeni regolatore complesso mutante </td><td> Miller et al., 1990 </td></tr><tr><td> PhoP c Avra- </td><td> Avra-mutazione </td><td> Collier-Hyams et al., 2002 </td></tr><tr><td> PhoP c AvrA-/AvrA + </td><td> PhoP c Avra-Avra completato con codifica plasmide </td><td> Collier-Hyams et al., 2002 </td></tr></tbody></table>

<ol>
	<li>Duan, Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=beta-Catenin+activity+negatively+regulates+bacteria-induced+inflammation.">beta-Catenin activity negatively regulates bacteria-induced inflammation.</a> Lab Invest. 87 (6), 613-624 (2007).</li><li>Barthel, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Pretreatment+of+mice+with+streptomycin+provides+a+Salmonella+enterica+serovar+Typhimurium+colitis+model+that+allows+analysis+of+both+pathogen+and+host.">Pretreatment of mice with streptomycin provides a Salmonella enterica serovar Typhimurium colitis model that allows analysis of both pathogen and host.</a> Infection and immunity. 71 (5), 2839-2858 (2003).</li><li>Miller, S. I., Mekalanos, J. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Constitutive+expression+of+the+phoP+regulon+attenuates+Salmonella+virulence+and+survival+within+macrophages.">Constitutive expression of the phoP regulon attenuates Salmonella virulence and survival within macrophages.</a> Journal of bacteriology. 172 (5), 2485-2490 (1990).</li><li>Valdez, Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Nramp1+expression+by+dendritic+cells+modulates+inflammatory+responses+during+Salmonella+Typhimurium+infection.">Nramp1 expression by dendritic cells modulates inflammatory responses during Salmonella Typhimurium infection.</a> Cell Microbiol. 10 (8), 1646-1661 (2008).</li><li>Woo, H., Okamoto, S., Guiney, D., Gunn, J. S., Fierer, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+model+of+Salmonella+colitis+with+features+of+diarrhea+in+SLC11A1+wild-type+mice.">A model of Salmonella colitis with features of diarrhea in SLC11A1 wild-type mice.</a> PLoS ONE. 3 (2), e1603-e1603 (2008).</li><li>Dangl, J. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Molecular+call-and-response:+how+Salmonella+learns+the+gospel+from+its+host.">Molecular call-and-response: how Salmonella learns the gospel from its host.</a> Trends Microbiol. 11 (6), 245-246 (2003).</li><li>Zaharik, M. L., Vallance, B. A., Puente, J. L., Gros, P., Finlay, B. B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Host-pathogen+interactions:+Host+resistance+factor+Nramp1+up-regulates+the+expression+of+Salmonella+pathogenicity+island-2+virulence+genes.">Host-pathogen interactions: Host resistance factor Nramp1 up-regulates the expression of Salmonella pathogenicity island-2 virulence genes.</a> Proceedings of the National Academy of Sciences of the United States of America. 99, 15705-15710 (2002).</li><li>Townsend, P., Morton, D. B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Laboratory+Animal+Care+Policies+and+Regulations:+United+Kingdom.">Laboratory Animal Care Policies and Regulations: United Kingdom.</a> ILAR J. 37 (2), 68-74 (1995).</li><li>Olfert, E. D., Godson, D. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Humane+endpoints+for+infectious+disease+animal+models.">Humane endpoints for infectious disease animal models.</a> ILAR J. 41 (2), 99-104 (2000).</li><li>Ye, Z., Petrof, E. O., Boone, D., Claud, E. C., Sun, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Salmonella+effector+AvrA+regulation+of+colonic+epithelial+cell+inflammation+by+deubiquitination.">Salmonella effector AvrA regulation of colonic epithelial cell inflammation by deubiquitination.</a> Am J Pathol. 171 (3), 882-892 (2007).</li><li>Grassl, G. A., Valdez, Y., Bergstrom, K. S., Vallance, B. A., Finlay, B. B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Chronic+enteric+salmonella+infection+in+mice+leads+to+severe+and+persiste+nt+intestinal+fibrosis.">Chronic enteric salmonella infection in mice leads to severe and persiste nt intestinal fibrosis.</a> Gastroenterology. 134 (3), 768-780 (2008).</li><li>Sukupolvi, S., Edelstein, A., Rhen, M., Normark, S. J., Pfeifer, J. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Development+of+a+murine+model+of+chronic+Salmonella+infection.">Development of a murine model of chronic Salmonella infection.</a> Infection and immunity. 65 (2), 838-842 (1997).</li><li>. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Biosafety in Microbiological and Biomedical Laboratories (BMBL). , (2007).</li><li>Wu, S., Lu, R., Zhang, Y., Sun, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Chronic+effects+of+a+Salmonella+type+III+secretion+effector+protein+AvrA+in+vivo.">Chronic effects of a Salmonella type III secretion effector protein AvrA in vivo.</a> PLoS ONE. , (2010).</li></ol>

Nessun conflitto di interessi dichiarati.

Per utilizzare questo sistema, è necessario che il ricercatore per imparare a sonda gastrica degli animali. Noi dettaglio una metodologia per preparare la cultura batterica e sonda gastrica i topi. Mostriamo anche come monitorare la persistenza Salmonella nel tratto gastrointestinale (GI). Le fasi critiche in questo protocollo, tra cui: <ol><li> Streptomicina-pretrattamento: Streptomicina-pretrattamento riusciva a liberarsi di qualche commensale della flora intestinale e fanno i topi suscettibili alla infe...

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<td>HBSS</td>
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chronic salmonella infected mouse model

Il modello di infezione batterica del mouse è un sistema potente modello per lo studio di aree come infezioni, infiammazioni, immunologia, trasduzione del segnale, e tumorigenesi. Molti ricercatori hanno approfittato della colite indotta da<em&gt; Salmonella</emTyphimurium&gt; per gli studi sulla fase precoce di infiammazione e infezione. Tuttavia, solo pochi studi sono l&#39;infezione cronica<em&gt; In vivo</em&gt;. I topi con<em&gt; Salmonella</emEsistenza&gt; persistente nel tratto gastrointestinale ci permettono di esplorare a lungo termine di interazione ospite-batterico, trasduzione del segnale, e tumorigenesi. Abbiamo stabilito un modello batterica cronica del mouse infettati con<em&gt; Salmonella</em&gt; Colonizzazione typhimurium nell&#39;intestino del mouse di oltre 6 mesi. Per utilizzare questo sistema, è necessario che il ricercatore per imparare a preparare la coltura batterica e sonda gastrica degli animali. Noi dettaglio una metodologia per la preparazione coltura batterica e topi sonda gastrica. Mostriamo anche come rilevare la<em&gt; Salmonella</emPersistenza&gt; nel tratto gastrointestinale. Nel complesso, questo protocollo sarà di aiuto ricercatori che utilizzano il modello di infezione batterica del mouse per affrontare le questioni biologiche e microbiologiche di fondamentale importanza.

Watch this Scientific Journal Video about Chronic Salmonella Infected Mouse Model at JoVE.com

Chronic Salmonella Infected Mouse Model

Stabilire un modello batterica cronica del mouse infettati con persistente<em&gt; Salmonella</em&gt; Colonizzazione typhimurium nell&#39;intestino per 27 settimane.

Cronico Salmonella Modello mouse infetti

The bacterial infected mouse model is a powerful model system for studying areas such as infection, inflammation, immunology, signal transduction, and ...

Research

JoVE Journal

Biology

Chronic Salmonella Infected Mouse Model

17.2K Views.  University of Rochester. Stabilire un modello batterica cronica del mouse infettati con persistente Salmonella Colonizzazione typhimurium nell'intestino per 27 settimane.

Video: Chronic Salmonella Infected Mouse Model

Orthotopic Mouse Model of Colorectal Cancer

The traditional subcutaneous tumor model is less than ideal for studying colorectal cancer. Orthotopic mouse models of colorectal cancer, which feature cancer cells growing in their natural location, replicate human disease with high fidelity. Two techniques can be used to establish this model. Both techniques are similar and require mouse anesthesia and laparotomy for exposure of the cecum. One technique involves injection of a colorectal cancer cell suspension into the cecal wall. Cancer cells are first grown in culture, harvested when subconfluent and prepared as a single cell suspension. A small volume of cells is injected slowly to avoid leakage. The other technique involves transplantation of a piece of subcutaneous tumor onto the cecum. A mouse with a previously established subcutaneous colorectal tumor is euthanized and the tumor is removed using sterile technique. The tumor piece is divided into small pieces for transplantation to another mouse. Prior to transplantation, the cecal wall is lightly damaged to facilitate tumor cell infiltration. The time to developing primary tumors and liver metastases will vary depending on the technique, cell line, and mouse species used. This orthotopic mouse model is useful for studying the natural progression of colorectal cancer and testing new therapeutic agents against colorectal cancer.

Two techniques can be used to establish this model: injection of a cancer cell suspension into the cecal wall or transplantation of a piece of subcutaneous tumor onto the cecum. This model is useful for studying the natural progression of colorectal cancer and testing new therapeutic agents against colorectal cancer.

Topo Modello ortotopico di cancro colorettale

The traditional subcutaneous tumor model is less than ideal for studying colorectal cancer. Orthotopic mouse models of colorectal cancer, which feature ...

Ricerca

Biologia

Laser-Induced Chronic Ocular Hypertension Model on SD Rats

Glaucoma is one of the major causes of blindness in the world. Elevated intraocular pressure is a major risk factor. Laser photocoagulation induced ocular hypertension is one of the well established animal models. This video demonstrates how to induce ocular hypertension by Argon laser photocoagulation in rat.

Glaucoma is one of the major causes of blindness in the world. Elevated intraocular pressure is a major risk factor. Laser photocoagulation induced ocular hypertension is one of the well established animal models. This video demonstrates how to induce ocular hypertension by Argon laser photocoagulation in rat.

Laser-Induced cronica ipertensione oculare su Ratti modello SD

Glaucoma is one of the major causes of blindness in the world. Elevated intraocular pressure is a major risk factor. Laser photocoagulation induced ocular ...

Immunohistochemistry on Paraffin Sections of Mouse Epidermis Using Fluorescent Antibodies

In the epidermis, immunohistochemistry is an efficient means of localizing specific proteins to their relative expression compartment; namely the basal, suprabasal, and stratum corneum layers. The precise localization within the epidermis of a particular protein lends clues toward its functional role within the epidermis. In this chapter, we describe a reliable method for immunolocalization within the epidermis modified for both frozen and paraffin sections that we use very routinely in our laboratory. Paraffin sections generally provide much better morphology, hence, superior results and photographs; however, not all antibodies will work with the harsh fixation and treatment involved in their processing. Therefore, the protocol for frozen sectioning is also included. Within paraffin sectioning, two fixation protocols are described (Bouin's and paraformaldehyde); the choice of fixative will be directly related to the antibody specifications and may require another fixing method.

We describe a reliable method for immunolocalization within the epidermis modified for both frozen and paraffin sections that we use very routinely in our laboratory.

Immunoistochimica su sezioni di paraffina di epidermide mouse utilizzando anticorpi fluorescenti

In the epidermis, immunohistochemistry is an efficient means of localizing specific proteins to their relative expression compartment; namely the basal, ...

In vivo Imaging and Therapeutic Treatments in an Orthotopic Mouse Model of Ovarian Cancer

Human cancer and response to therapy is better represented in orthotopic animal models. This paper describes the development of an orthotopic mouse model of ovarian cancer, treatment of cancer via oral delivery of drugs, and monitoring of tumor cell behavior in response to drug treatment in real time using in vivo imaging system. In this orthotopic model, ovarian tumor cells expressing luciferase are applied topically by injecting them directly into the mouse bursa where each ovary is enclosed. Upon injection of D-luciferin, a substrate of firefly luciferase, luciferase-expressing cells generate bioluminescence signals. This signal is detected by the in vivo imaging system and allows for a non-invasive means of monitoring tumor growth, distribution, and regression in individual animals. Drug administration via oral gavage allows for a maximum dosing volume of 10 mL/kg body weight to be delivered directly to the stomach and closely resembles delivery of drugs in clinical treatments. Therefore, techniques described here, development of an orthotopic mouse model of ovarian cancer, oral delivery of drugs, and in vivo imaging, are useful for better understanding of human ovarian cancer and treatment and will improve targeting this disease.

In vivo Imaging and Therapeutic Treatments in an Orthotopic Mouse Model of Ovarian Cancer

Orthotopic animal models of ovarian cancer replicate better human disease and therefore enhance our understanding of cancer progression and tumor response to therapy. A mouse model receives an intrabursal injection of luciferase-expressing ovarian tumor cells. Treatment is administered via oral gavage. Tumor growth is monitored by in vivo imaging system.

Imaging in vivo e trattamenti terapeutici in un modello di mouse ortotopico di cancro ovarico

Human cancer and response to therapy is better represented in orthotopic animal models.  This paper describes the development of an orthotopic mouse model ...

Generation of Mice Derived from Induced Pluripotent Stem Cells

The production of induced pluripotent stem cells (iPSCs) from somatic cells provides a means to create valuable tools for basic research and may also produce a source of patient-matched cells for regenerative therapies. iPSCs may be generated using multiple protocols and derived from multiple cell sources. Once generated, iPSCs are tested using a variety of assays including immunostaining for pluripotency markers, generation of three germ layers in embryoid bodies and teratomas, comparisons of gene expression with embryonic stem cells (ESCs) and production of chimeric mice with or without germline contribution2. Importantly, iPSC lines that pass these tests still vary in their capacity to produce different differentiated cell types2. This has made it difficult to establish which iPSC derivation protocols, donor cell sources or selection methods are most useful for different applications.
The most stringent test of whether a stem cell line has sufficient developmental potential to generate all tissues required for survival of an organism (termed full pluripotency) is tetraploid embryo complementation (TEC)3-5. Technically, TEC involves electrofusion of two-cell embryos to generate tetraploid (4n) one-cell embryos that can be cultured in vitro to the blastocyst stage6. Diploid (2n) pluripotent stem cells (e.g. ESCs or iPSCs) are then injected into the blastocoel cavity of the tetraploid blastocyst and transferred to a recipient female for gestation (see Figure 1). The tetraploid component of the complemented embryo contributes almost exclusively to the extraembryonic tissues (placenta, yolk sac), whereas the diploid cells constitute the embryo proper, resulting in a fetus derived entirely from the injected stem cell line.
Recently, we reported the derivation of iPSC lines that reproducibly generate adult mice via TEC1. These iPSC lines give rise to viable pups with efficiencies of 5-13%, which is comparable to ESCs3,4,7 and higher than that reported for most other iPSC lines8-12. These reports show that direct reprogramming can produce fully pluripotent iPSCs that match ESCs in their developmental potential and efficiency of generating pups in TEC tests. At present, it is not clear what distinguishes between fully pluripotent iPSCs and less potent lines13-15. Nor is it clear which reprogramming methods will produce these lines with the highest efficiency. Here we describe one method that produces fully pluripotent iPSCs and "all- iPSC" mice, which may be helpful for investigators wishing to compare the pluripotency of iPSC lines or establish the equivalence of different reprogramming methods.

Generating induced pluripotent stem cell (iPSC) lines produces lines of differing developmental potential even when they pass standard tests for pluripotency. Here we describe a protocol to produce mice derived entirely from iPSCs, which defines the iPSC lines as possessing full pluripotency1.

Generazione di topi derivati ​​da cellule staminali pluripotenti indotte

The production of induced pluripotent stem cells (iPSCs) from somatic cells provides a means to create valuable tools for basic research and may also ...

Maintaining Aedes aegypti Mosquitoes Infected with Wolbachia

Aedes aegypti mosquitoes experimentally infected with Wolbachia are being utilized in programs to control the spread of arboviruses such as dengue, chikungunya and Zika. Wolbachia-infected mosquitoes can be released into the field to either reduce population sizes through incompatible matings or to transform populations with mosquitoes that are refractory to virus transmission. For these strategies to succeed, the mosquitoes released into the field from the laboratory must be competitive with native mosquitoes. However, maintaining mosquitoes in the laboratory can result in inbreeding, genetic drift and laboratory adaptation which can reduce their fitness in the field and may confound the results of experiments. To test the suitability of different Wolbachia infections for deployment in the field, it is necessary to maintain mosquitoes in a controlled laboratory environment across multiple generations. We describe a simple protocol for maintaining Ae. aegypti mosquitoes in the laboratory, which is suitable for both Wolbachia-infected and wild-type mosquitoes. The methods minimize laboratory adaptation and implement outcrossing to increase the relevance of experiments to field mosquitoes. Additionally, colonies are maintained under optimal conditions to maximize their fitness for open field releases.

Maintaining Aedes aegypti Mosquitoes Infected with Wolbachia

Aedes aegypti mosquitoes infected with Wolbachia are being released into natural populations to suppress the transmission of arboviruses. We describe methods to rear Ae. aegypti with Wolbachia infections in the laboratory for experiments and field release, taking precautions to minimize laboratory adaptation and selection.

Mantenimento di Aedes aegypti zanzare infettate con Wolbachia

Aedes aegypti mosquitoes experimentally infected with Wolbachia are being utilized in programs to control the spread of arboviruses such as dengue, ...

The Murine Choline-Deficient, Ethionine-Supplemented (CDE) Diet Model of Chronic Liver Injury

Chronic liver diseases, such as viral hepatitis, alcoholic liver disease, or non-alcoholic fatty liver disease, are characterized by continual inflammation, progressive destruction and regeneration of the hepatic parenchyma, liver progenitor cell proliferation, and fibrosis. The end-stage of every chronic liver disease is cirrhosis, a major risk factor for the development of hepatocellular carcinoma. To study processes regulating disease initiation, establishment, and progression, several animal models are used in laboratories. Here we describe a six-week time course of the choline-deficient and ethionine-supplemented (CDE) mouse model, which involves feeding six-week old male C57BL/6J mice with choline-deficient chow and 0.15% DL-ethionine-supplemented drinking water. Monitoring of animal health and a typical body weight loss curve are explained. The protocol demonstrates the gross examination of a CDE-treated liver and blood collection by cardiac puncture for subsequent serum analyses. Next, the liver perfusion technique and collection of different hepatic lobes for standard evaluations are shown, including liver histology assessments by hematoxylin and eosin or Sirius Red stainings, immunofluorescent detection of hepatic cell populations as well as transcriptome profiling of the liver microenvironment. This mouse model is suitable for studying inflammatory, fibrogenic, and liver progenitor cell dynamics induced through chronic liver disease and can be used to test potential therapeutic agents that may modulate these processes.

The Murine Choline-Deficient, Ethionine-Supplemented CDE Diet Model of Chronic Liver Injury

Here we describe a common method to induce chronic liver injury in mice by feeding of a choline-deficient and ethionine-supplemented (CDE) diet. We demonstrate health monitoring, liver perfusion, isolation, and preservation. A time course of six weeks can inform about liver injury, pathohistology, fibrosis, inflammatory, and liver progenitor cell responses.

La murino colina-carenti, etionina-completati (CDE) dieta modello della lesione epatica cronica

Chronic liver diseases, such as viral hepatitis, alcoholic liver disease, or non-alcoholic fatty liver disease, are characterized by continual ...

Trans-inner Cell Mass Injection of Embryonic Stem Cells Leads to Higher Chimerism Rates

In an effort to increase efficiency in the creation of genetically modified mice via ES Cell methodologies, we present an adaptation to the current blastocyst injection protocol. Here we report that a simple rotation of the embryo, and injection through Trans-Inner cell mass (TICM) increased the percentage of chimeric mice from 31% to 50%, with no additional equipment or further specialized training. 26 different inbred clones, and 35 total clones were injected over a period of 9 months. There was no significant difference in either pregnancy rate or recovery rate of embryos between traditional injection techniques and TICM. Therefore, without any major alteration in the injection process and a simple positioning of the blastocyst and injecting through the ICM, releasing the ES cells into the blastocoel cavity can potentially improve the quantity of chimeric production and subsequent germline transmission.

Here we present a protocol to increase chimera production without the use of new equipment. A simple orientation change of the embryo for injection can increase the number of embryos produced, and potentially reduce the timeline to germline transmission.

Trans-inner Cell Mass iniezione delle cellule staminali embrionali porta a tassi più elevati di chimerismo

In an effort to increase efficiency in the creation of genetically modified mice via ES Cell methodologies, we present an adaptation to the current ...

Quasi-metagenomic Analysis of Salmonella from Food and Environmental Samples

Quasi-metagenomics sequencing refers to the sequencing-based analysis of modified microbiomes of food and environmental samples. In this protocol, microbiome modification is designed to concentrate genomic DNA of a target foodborne pathogen contaminant to facilitate the detection and subtyping of the pathogen in a single workflow. Here, we explain and demonstrate the sample preparation steps for the quasi-metagenomics analysis of Salmonella enterica from representative food and environmental samples including alfalfa sprouts, ground black pepper, ground beef, chicken breast and environmental swabs. Samples are first subjected to the culture enrichment of Salmonella for a shortened and adjustable duration (4&#8211;24 h). Salmonella cells are then selectively captured from the enrichment culture by immunomagnetic separation (IMS). Finally, multiple displacement amplification (MDA) is performed to amplify DNA from IMS-captured cells. The DNA output of this protocol can be sequenced by high throughput sequencing platforms. An optional quantitative PCR analysis can be performed to replace sequencing for Salmonella detection or assess the concentration of Salmonella DNA before sequencing.

Quasi-metagenomic Analysis of Salmonella from Food and Environmental Samples

Here, we present a protocol to prepare DNA samples from food and environmental microbiomes for concerted detection and subtyping of Salmonella through quasimetagenomic sequencing. The combined use of culture enrichment, immunomagnetic separation (IMS), and multiple displacement amplification (MDA) allows effective concentration of Salmonella genomic DNA from food and environmental samples.&#160;

Analisi metagenomica quasi di Salmonella da campioni ambientali e alimentari

Quasi-metagenomics sequencing refers to the sequencing-based analysis of modified microbiomes of food and environmental samples. In this protocol, ...

Mass Spectrometry Analysis to Identify Ubiquitylation of EYFP-tagged CENP-A (EYFP-CENP-A)

Studying the structure and the dynamics of kinetochores and centromeres is important in understanding chromosomal instability (CIN) and cancer progression. How the chromosomal location and function of a centromere (i.e., centromere identity) are determined and participate in accurate chromosome segregation is a fundamental question. CENP-A is proposed to be the non-DNA indicator (epigenetic mark) of centromere identity, and CENP-A ubiquitylation is required for CENP-A deposition at the centromere, inherited through dimerization between cell division, and indispensable to cell viability.
Here we describe mass spectrometry analysis to identify ubiquitylation of EYFP-CENP-A K124R mutant suggesting that ubiquitylation at a different lysine is induced because of the EYFP tagging in the CENP-A K124R mutant protein. Lysine 306 (K306) ubiquitylation in EYFP-CENP-A K124R was successfully identified, which corresponds to lysine 56 (K56) in CENP-A through mass spectrometry analysis. A caveat is discussed in the use of GFP/EYFP or the tagging of high molecular weight protein as a tool to analyze the function of a protein. Current technical limit is also discussed for the detection of ubiquitylated bands, identification of site-specific ubiquitylation(s), and visualization of ubiquitylation in living cells or a specific single cell during the whole cell cycle.
The method of mass spectrometry analysis presented here can be applied to human CENP-A protein with different tags and other centromere-kinetochore proteins. These combinatory methods consisting of several assays/analyses could be recommended for researchers who are interested in identifying functional roles of ubiquitylation.

Mass Spectrometry Analysis to Identify Ubiquitylation of EYFP-tagged CENP-A EYFP-CENP-A

CENP-A ubiquitylation is an important requirement for CENP-A deposition at the centromere, inherited through dimerization between cell division, and indispensable to cell viability. Here we describe mass spectrometry analysis to identify ubiquitylation of EYFP-tagged CENP-A (EYFP-CENP-A) protein.