Este trabajo fue apoyado por el NIH subvención DK080351 para PC.

Protocolo experimental El primer paso de este protocolo experimental es recoger un gran número de glándulas pituitarias de ratón. El segundo paso consiste en homogeneizar las glándulas para preparar un extracto de proteínas. El tercer paso es para emulsionar estas proteínas con una mezcla de hidrocarburos. Paso 1: Recolección y almacenamiento de ratón glándulas pituitarias La glándula pituitaria del ratón se encuentra en la base del cráneo en una depresión del hueso esfenoides llamada silla turca, rodeada lateralmente por los nervios trigémino y anteriormente por el quiasma óptico. La glándula está compuesta de un lóbulo anterior más grande y más pequeño lóbulo posterior y medio, y pesa un promedio de 1,9 mg. La glándula pituitaria son recogidos de los ratones de cepas mixta, sexos, edades, y destinado a ser sacrificado por el centro de atención animal. Para aislar la glándula pituitaria, el ratón es la eutanasia, la piel sobre el cráneo disecado, y el hueso del cráneo a cielo abierto con unas tijeras. El cerebro se levanta para exponer la glándula pituitaria, la cual es entonces aislado de los alrededores de la duramadre, recogió del hueso esfenoides y se almacena en un tubo de plástico con hielo seco. En general, se utilizan 300 glándulas pituitaria del ratón para la preparación de una proteína, un número que puede ser recogido por una persona en 9 horas. Una vez que la colección se completa, el tubo que contiene las glándulas pituitarias se almacenan a -80 ° C hasta que esté listo para el siguiente paso. Paso 2. La extracción de las proteínas del ratón pituitaria <ol><li> Añadir el tampón de homogeneización a un tubo Falcon de 15 ml (catálogo no 352.059), mantenidos en un baño de hielo, con 250 l de tampón por cada 100 glándulas pituitarias recogidos. Utilice un tampón de fuerza iónica similar a la que es fisiológicamente el interior del citoplasma de la célula (0,2 M) y de pH fisiológico (7,4). Usamos tampón fosfato salino (0,161 M, pH 7,4), complementado con un cóctel de inhibidores de la proteasa (Sigma-Aldrich, el catálogo no P8340-1 ml). </li><li> Añadir la glándula pituitaria en el búfer antes de la homogeneización, y luego colocar el generador (5 mm de diámetro) de la homogeneizador Polytron en la parte inferior del tubo Falcon. Homogeneizar a máximas rpm durante 30 segundos, moviendo suavemente el tubo Falcon arriba y hacia abajo mientras lo mantiene en el baño de hielo. Luego, el resto del homogeneizado en hielo durante 1 min. Repita la homogeneización y refrigeración pasos dos veces más. Esta homogeneización suave debe romper las células y liberar las proteínas citosólicas sin interrumpir los núcleos. </li><li> Para eliminar los núcleos, el tejido roto y materiales insolubles (por ejemplo, tejido conectivo y los complejos de proteínas desnaturalizadas), se centrifuga el homogeneizado a baja velocidad (1000 g) durante 10 min a 4 ° C. </li><li> Transferir el sobrenadante (que ahora se llama post-nuclear sobrenadante, PNS) a un nuevo tubo Falcon, teniendo cuidado de dejar la bolita sin tocar, y almacenar el SNP en el hielo. </li><li> Resuspender el precipitado en el volumen original de tampón de homogeneización (250 l de tampón por cada 100 glándulas pituitarias recogidos), homogeneizar el anterior, se centrifuga como antes, y luego combinar el SNP segundo con el primero. </li><li> Alícuota de los dos combinados PNS muestras en tubos de microcentrífuga y se almacena a -80 ° C hasta que esté listo para el siguiente paso. Esta preparación de proteínas puede ser almacenado a -80 ° C, pero poco a poco pierde su potencia, lo que se recomienda para utilizar antes de 6 meses a partir de la preparación. Use una pequeña alícuota para determinar el rendimiento de proteína y la concentración por el ensayo BCA (Pierce catálogo no. 23.225), y la calidad de las proteínas por electroforesis en gel. En general, se obtienen alrededor de 60 mg de proteína de 300 hipófisis de ratón en 1,5 ml de tampón de homogeneización, a una concentración de alrededor de 40 mg / ml. </li></ol> Paso 3. Preparación de la emulsión para la inmunización <ol><li> Descongele rápidamente las alícuotas congeladas proteína necesaria para el experimento y ajustar la concentración de proteínas y 20 mg / ml. Este extracto de proteínas se emulsiona 1:1 con adyuvante completo de Freund (CFA, Sigma F-5881) que contiene 5 mg / mL de calor mató a Mycobacterium tuberculosis (Becton Dickinson, 231 141). Cada ratón recibirá 1 mg de extracto de pituitaria en 100 L de la emulsión. </li><li> El ejemplo anterior es para inmunizar a 10 ratones, en la que cada ratón inyectado con 100 L de la emulsión que contiene 1 mg de proteínas de la hipófisis. Permitir que dos ratones más por la pérdida de material durante la preparación, a fin de utilizar 12 mg de proteínas de la hipófisis. Aspire 600 l de los 20 mg / ml de extracto de proteína de la pituitaria anterior describe con una jeringa de 2,5 ml Hamilton gas. Resuspender el Comité de Libertad Sindical por agitación, y aspiran 600 l de CFA en otra jeringa de 2,5 ml Hamilton. Adjuntar y asegurar una de calibre 22 micro-emulsión aguja en la jeringa llena de CFA. Empuje lentamente el émbolo de la jeringa CFA de tal manera que la aguja está lleno de CFA, a continuación, colocar y fijar el otro extremo de lala aguja de la jeringa llena con extracto de pituitaria. </li><li> Avanzar lentamente el émbolo de la jeringa CFA para impulsar el componente de aceite en el extracto acuoso pituitaria, de tal manera que sólo una pequeña cantidad se mezcla. A continuación, empuje el émbolo de la jeringa extracto de pituitaria en la jeringa CFA. Repita esta acción aumentando gradualmente la cantidad de material mezclado. Continúe hasta que todo el contenido de las dos jeringas se mezclan. Usted obtendrá una solución blanquecina y uniformemente distribuida que representa la emulsión de agua en aceite. </li><li> Una vez que la emulsión se forma, repita el movimiento hacia adelante y hacia atrás por lo menos 500 veces para asegurarse de que la emulsión se mezcla bien. Después de que el ciclo de mezclado final, la 1:01 de agua en emulsión de aceite está listo para usar y contiene una concentración de proteína pituitaria de 10 mg / ml. La emulsión se inyectó el mismo día por vía subcutánea en ratones anestesiados SJL, como se detalla en el artículo JoVe compañero. </li></ol>

<ol>
	<li>Caturegli, P., Newschaffer, C., Olivi, A., Pomper, M. G., Burger, P. C., Rose, N. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Autoimmune Hypophysitis Endocr Rev. 26, 599-614 (2005).</li><li>Blansfield, J. A., Beck, K. E., Tran, K., Yang, J. C., Hughes, M. S., Kammula, U. S., Royal, R. E., Topalian, S. L., Haworth, L. R., Levy, C., Rosenberg, S. A., Sherry, R. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cytotoxic+T-lymphocyte-associated+antigen-4+blockage+can+induce+autoimmune+hypophysitis+in+patients+with+metastatic+melanoma+and+renal+cancer.">Cytotoxic T-lymphocyte-associated antigen-4 blockage can induce autoimmune hypophysitis in patients with metastatic melanoma and renal cancer.</a> J Immunother. 28, 593-598 (2005).</li><li>Tzou, S. C., Lupi, I., Landek, M., Gutenberg, A., Tzou, Y. M., Kimura, H., Pinna, G., Rose, N. R., Caturegli, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Autoimmune+Hypophysitis+of+SJL+mice:+Clinical+Insights+from+a+New+Animal+Model.">Autoimmune Hypophysitis of SJL mice: Clinical Insights from a New Animal Model.</a> Endocrinology. 149, 3461-3469 (2008).</li><li>Goudie, R. B., Pinkerton, P. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Anterior+hypophysitis+and+Hashimoto's+disease+in+a+woman.">Anterior hypophysitis and Hashimoto's disease in a woman.</a> J Pathol Bacteriol. 83, 584-585 (1962).</li><li>Caturegli, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Autoimmune+hypophysitis:+an+underestimated+disease+in+search+of+its+autoantigen(s).">Autoimmune hypophysitis: an underestimated disease in search of its autoantigen(s).</a> J Clin Endocrinol Metab. 92, 2038-2040 (2007).</li></ol>

A pesar de que el primer paciente con hipofisitis autoinmune se informó en 1962 4, los autoantígenos patógenos hipófisis aún no se han identificado 5. Los modelos animales pueden ser muy útiles para identificar a estos autoantígenos, ayudar al descubrimiento de biomarcadores que son traducibles al cuidado del paciente. Este artículo ha demostrado un procedimiento sencillo para la preparación de proteínas de la hipófisis en una forma que es adecuada para la inducción de hipofisitis autoi...

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">	
		
		<div>
		<table border="1">
		<thead>
		<tr>
		<th>Material Name</th>
		<th>Type</th>
		<th>Company</th>
		<th>Catalogue Number</th>
		<th>Comment</th>
		</tr>
		</thead>
		<tbody>
		
<tr>
<td>15-ml Falcon tubes</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>homogenization buffer</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>phosphate buffered saline</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>protease inhibitor cocktail</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Polytron homogenizer</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>BCA assay</td>
<td>&nbsp;</td>
<td>Pierce</td>
<td>23225</td>
<td>&nbsp;</td>
<tr>
<td>Complete Freund's Adjuvant (CFA)</td>
<td>&nbsp;</td>
<td>Sigma</td>
<td>F-5881</td>
<td>&nbsp;</td>
<tr>
<td>Mycobacterium tuberculosis</td>
<td>&nbsp;</td>
<td>Becton Dickinson</td>
<td>231141</td>
<td>&nbsp;</td>
<tr>
<td>2.5 mL Hamilton gastight syringe</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>22-gauge micro-emulsifying needle</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>		</tbody>
		</table>
		</div>

preparation of mouse pituitary immunogen for the induction of experimental autoimmune hypophysitis

Hipofisitis autoinmune es una inflamación crónica de la glándula pituitaria causado o acompañado por una autoinmunidad. Tradicionalmente se ha considerado una enfermedad rara, pero la información se ha incrementado notablemente en los últimos años. Hipofisitis, de hecho, no es raro desarrolla como un &quot;efecto secundario&quot; en pacientes con cáncer tratados con anticuerpos que bloquean los receptores inhibitorios expresa en los linfocitos T, tales como CTLA-4 2 y los receptores de PD-1. Hipofisitis autoinmune puede ser inducida experimentalmente mediante la inyección de ratones con las proteínas de la hipófisis se mezcla con un adyuvante 3. En este artículo de vídeo que muestra cómo extraer las proteínas de ratón glándulas pituitaria y la forma de prepararlos de forma adecuada para la inducción de hipofisitis autoinmune en ratones SJL.

Watch this Scientific Journal Video about Preparation of Mouse Pituitary Immunogen for the Induction of Experimental Autoimmune Hypophysitis at JoVE.com

Preparation of Mouse Pituitary Immunogen for the Induction of Experimental Autoimmune Hypophysitis

Hipofisitis autoinmune se puede reproducir en ratones mediante la inyección de un extracto de proteínas de ratón pituitaria.

Preparación de inmunógeno ratón hipófisis para la inducción de la hipofisitis autoinmune experimental

Autoimmune hypophysitis is a chronic inflammation of the pituitary gland caused or accompanied by autoimmunity1.  It has traditionally been considered a ...

preparation-mouse-pituitary-immunogen-for-induction-experimental

Research

JoVE Journal

Immunology and Infection

14.5K vistas.  The Johns Hopkins University. Hipofisitis autoinmune se puede reproducir en ratones mediante la inyección de un extracto de proteínas de ratón pituitaria.

Video: Preparation of Mouse Pituitary Immunogen for the Induction of Experimental Autoimmune Hypophysitis

Induction of Experimental Autoimmune Hypophysitis in SJL Mice

Autoimmune hypophysitis can be reproduced experimentally by the injection of pituitary proteins mixed with an adjuvant into susceptible mice1. Mouse models allow us to study how diseases unfold, often providing a good replica of the same processes occurring in humans. For some autoimmune diseases, like type 1A diabetes, there are models (the NOD mouse) that spontaneously develop a disease similar to the human counterpart. For many other autoimmune diseases, however, the model needs to be induced experimentally. A common approach in this regard is to inject the mouse with a dominant antigen derived from the organ being studied. For example, investigators interested in autoimmune thyroiditis inject mice with thyroglobulin2, and those interested in myasthenia gravis inject them with the acetylcholine receptor3. If the autoantigen for a particular autoimmune disease is not known, investigators inject a crude protein extract from the organ targeted by the autoimmune reaction. For autoimmune hypophysitis, the pathogenic autoantigen(s) remain to be identified4, and thus a crude pituitary protein preparation is used. In this video article we demonstrate how to induce experimental autoimmune hypophysitis in SJL mice.

This video shows how to induce autoimmune hypophysitis in SJL mice and how to assess its severity by histopathology.

La inducción de la hipofisitis autoinmune experimental en ratones SJL

Autoimmune hypophysitis can be reproduced experimentally by the injection of pituitary proteins mixed with an adjuvant into susceptible mice1. Mouse ...

Investigación

Inmunología e Infección

Overcoming Unresponsiveness in Experimental Autoimmune Encephalomyelitis (EAE) Resistant Mouse Strains by Adoptive Transfer and Antigenic Challenge

Experimental autoimmune encephalomyelitis (EAE) is an inflammatory disease of the central nervous system (CNS) and has been used as an animal model for study of the human demyelinating disease, multiple sclerosis (MS). EAE is characterized by pathologic infiltration of mononuclear cells into the CNS and by clinical manifestation of paralytic disease. Similar to MS, EAE is also under genetic control in that certain mouse strains are susceptible to disease induction while others are resistant. Typically, C57BL/6 (H-2b) mice immunized with myelin basic protein (MBP) fail to develop paralytic signs. This unresponsiveness is certainly not due to defects in antigen processing or antigen presentation of MBP, as an experimental protocol described here had been used to induce severe EAE in C57BL/6 mice as well as other reputed resistant mouse strains. In addition, encephalitogenic T cell clones from C57BL/6 and Balb/c mice reactive to MBP had been successfully isolated and propagated.
The experimental protocol involves using a cellular adoptive transfer system in which MBP-primed (200 &mu;g/mouse) C57BL/6 donor lymph node cells are isolated and cultured for five days with the antigen to expand the pool of MBP-specific T cells. At the end of the culture period, 50 million viable cells are transferred into naive syngeneic recipients through the tail vein. Recipient mice so treated normally do not develop EAE, thus reaffirming their resistant status, and they can remain normal indefinitely. Ten days post cell transfer, recipient mice are challenged with complete Freund adjuvant (CFA)-emulsified MBP in four sites in the flanks. Severe EAE starts to develop in these mice ten to fourteen days after challenge. Results showed that the induction of disease was antigenic specific as challenge with irrelevant antigens did not induce clinical signs of disease. Significantly, a titration of the antigen dose used to challenge the recipient mice showed that it could be as low as 5 &mu;g/mouse. In addition, a kinetic study of the timing of antigenic challenge showed that challenge to induce disease was effective as early as 5 days post antigenic challenge and as long as over 445 days post antigenic challenge. These data strongly point toward the involvement of a "long-lived" T cell population in maintaining unresponsiveness. The involvement of regulatory T cells (Tregs) in this system is not defined.

Overcoming Unresponsiveness in Experimental Autoimmune Encephalomyelitis EAE Resistant Mouse Strains by Adoptive Transfer and Antigenic Challenge

Certain mouse strains are able to resist induction of experimental autoimmune encephalomyelitis (EAE) with myelin basic protein. Described here is a simple immunization protocol that reverses the unresponsiveness and induces paralytic disease in several typical EAE resistant mouse stains.

Superar la falta de respuesta en encefalomielitis autoinmune experimental (EAE) cepas de ratones resistentes a través de transferencia adoptiva y la estimulación antigénica

Experimental autoimmune encephalomyelitis (EAE) is an inflammatory disease of the central nervous system (CNS) and has been used as an animal model for ...

Myelin Oligodendrocyte Glycoprotein (MOG35-55) Induced Experimental Autoimmune Encephalomyelitis (EAE) in C57BL/6 Mice

Multiple sclerosis is a chronic neuroinflammatory demyelinating disorder of the central nervous system with a strong neurodegenerative component. While the exact etiology of the disease is yet unclear, autoreactive T lymphocytes are thought to play a central role in its pathophysiology. MS therapy is only partially effective so far and research efforts continue to expand our knowledge on the pathophysiology of the disease and to develop novel treatment strategies. Experimental autoimmune encephalomyelitis (EAE) is the most common animal model for MS sharing many clinical and pathophysiological features. There is a broad diversity of EAE models which reflect different clinical, immunological and histological aspects of human MS. Actively-induced EAE in mice is the easiest inducible model with robust and replicable results. It is especially suited for investigating the effects of drugs or of particular genes by using transgenic mice challenged by autoimmune neuroinflammation. Therefore, mice are immunized with CNS homogenates or peptides of myelin proteins. Due to the low immunogenic potential of these peptides, strong adjuvants are used. EAE susceptibility and phenotype depends on the chosen antigen and rodent strain. C57BL/6 mice are the commonly used strain for transgenic mouse construction and respond among others to myelin oligodendrocyte glycoprotein (MOG). The immunogenic epitope MOG35-55 is suspended in complete Freund's adjuvant (CFA) prior to immunization and pertussis toxin is applied on the day of immunization and two days later. Mice develop a "classic" self-limited monophasic EAE with ascending flaccid paralysis within 9-14 days after immunization. Mice are evaluated daily using a clinical scoring system for 25-50 days. Special considerations for care taking of animals with EAE as well as potential applications and limitations of this model are discussed.

Myelin Oligodendrocyte Glycoprotein MOG35-55 Induced Experimental Autoimmune Encephalomyelitis EAE in C57BL/6 Mice

Experimental autoimmune encephalomyelitis (EAE) is an established animal model of multiple sclerosis. C57BL/6 mice are immunized with myelin oligodendrocyte glycoprotein (MOG) peptide 35-55 (MOG35-55), resulting in an ascending flaccid paralysis caused by autoreactive immune cells in the central nervous system. Protocols for disease induction and monitoring will be discussed.

La mielina glicoproteína del oligodendrocito (MOG<sub&gt; 35-55</sub&gt;) Inducida por la encefalomielitis autoinmune experimental (EAE) en ratones C57BL / 6 ratones

Multiple sclerosis is a chronic neuroinflammatory demyelinating disorder of the central nervous system with a strong neurodegenerative component. While ...

Isolation of Infiltrating Leukocytes from Mouse Skin Using Enzymatic Digest and Gradient Separation

Dissociating murine skin into a single cell suspension is essential for downstream cellular analysis such as the characterization of infiltrating immune cells in rodent models of skin inflammation. Here, we describe a protocol for the digestion of mouse skin in a nutrient-rich solution with collagenase D, followed by separation of hematopoietic cells using a discontinuous density gradient. Cells thus obtained can be used for in vitro studies, in vivo transfer, and other downstream cellular and molecular analyses including flow cytometry. This protocol is an effective and economical alternative to expensive mechanical dissociators, specialized separation columns, and harsher trypsin- and dispase-based digestion methods, which may compromise cellular viability or density of surface proteins relevant for phenotypic characterization or cellular function. As shown here in our representative data, this protocol produced highly viable cells, contained specific immune cell subsets, and had no effect on integrity of common surface marker proteins used in flow cytometric analysis.

This protocol describes enzymatic digestion of mouse skin in nutrient-rich medium followed by gradient separation to isolate leukocytes. Cells thus derived can be used for diverse downstream applications. This is an effective, economical, and improved alternative to tissue dissociation machines and harsher trypsin and dispase-based tissue digestion protocols.

Aislamiento de leucocitos infiltrantes de ratón Piel Usando enzimática Digest y Separación de degradado

Dissociating murine skin into a single cell suspension is essential for downstream cellular analysis such as the characterization of infiltrating immune ...

Induction of Experimental Autoimmune Encephalomyelitis in Mice and Evaluation of the Disease-dependent Distribution of Immune Cells in Various Tissues

Multiple sclerosis is presumed to be an inflammatory autoimmune disease, which is characterized by lesion formation in the central nervous system (CNS) resulting in cognitive and motor impairment. Experimental autoimmune encephalomyelitis (EAE) is a useful animal model of MS, because it is also characterized by lesion formation in the CNS, motor impairment and is also driven by autoimmune and inflammatory reactions. One of the EAE models is induced with a peptide derived from the myelin oligodendrocyte protein (MOG)35-55 in mice. The EAE mice develop a progressive disease course. This course is divided into three phases: the preclinical phase (day 0 - 9), the disease onset (day 10 - 11) and the acute phase (day 12 - 14). MS and EAE are induced by autoreactive T cells that infiltrate the CNS. These T cells secrete chemokines and cytokines which lead to the recruitment of further immune cells. Therefore, the immune cell distribution in the spinal cord during the three disease phases was investigated. To highlight the time point of the disease at which the activation/proliferation/accumulation of T cells, B cells and monocytes starts, the immune cell distribution in lymph nodes, spleen and blood was also assessed. Furthermore, the levels of several cytokines (IL-1&#946;, IL-6, IL-23, TNF&#945;, IFN&#947;) in the three disease phases were determined, to gain insight into the inflammatory processes of the disease. In conclusion, the data provide an overview of the functional profile of immune cells during EAE pathology.

This manuscript describes the methods for induction and scoring of the experimental autoimmune encephalomyelitis (EAE) model, together with the assessment of immune cell distribution and mRNA cytokine levels in lymph nodes, spleen, blood and spinal cord using flow cytometry and quantitative PCR, respectively, at various disease phases.

La inducción de la encefalomielitis autoinmune experimental en ratones y evaluación de la distribución de la enfermedad dependiente de las células inmunes en diversos tejidos

Multiple sclerosis is presumed to be an inflammatory autoimmune disease, which is characterized by lesion formation in the central nervous system (CNS) ...

Simple and Efficient Production and Purification of Mouse Myelin Oligodendrocyte Glycoprotein for Experimental Autoimmune Encephalomyelitis Studies

Multiple sclerosis (MS) is a chronic inflammatory disease of the central nervous system (CNS), thought to occur as a result of autoimmune responses targeting myelin. Experimental autoimmune encephalomyelitis (EAE) is the most common animal model of CNS autoimmune disease, and is typically induced via immunization with short peptides representing immunodominant CD4+ T cell epitopes of myelin proteins. However, B cells recognize unprocessed protein directly, and immunization with short peptide does not activate B cells that recognize the native protein. As recent clinical trials of B cell-depleting therapies in MS have suggested a role for B cells in driving disease in humans, there is an urgent need for animal models that incorporate B cell-recognition of autoantigen. To this end, we have generated a new fusion protein containing the extracellular domain of the mouse version of myelin oligodendrocyte glycoprotein (MOG) as well as N-terminal fusions of a His-tag for purification purposes and the thioredoxin protein to improve solubility (MOGtag). A tobacco etch virus (TEV) protease cleavage site was incorporated to allow the removal of all tag sequences, leaving only the pure MOG1-125 extracellular domain. Here, we describe a simple protocol using only standard laboratory equipment to produce large quantities of pure MOGtag or MOG1-125. This protocol consistently generates over 200 mg of MOGtag protein. Immunization with either MOGtag or MOG1-125 generates an autoimmune response that includes pathogenic B cells that recognize the native mouse MOG.

We describe a simple protocol using only basic lab equipment to generate and purify large quantities of a fusion protein that contains mouse Myelin Oligodendrocyte Glycoprotein. This protein can be used to induce experimental autoimmune encephalomyelitis driven by both T and B cells.

Producción simple y eficiente y purificación de ratón mielina de oligodendrocitos de la glucoproteína de la encefalomielitis autoinmune experimental Estudios

Multiple sclerosis (MS) is a chronic inflammatory disease of the central nervous system (CNS), thought to occur as a result of autoimmune responses ...

Induction of Drug-Induced, Autoimmune Hepatitis in BALB/c Mice for the Study of Its Pathogenic Mechanisms

Drug-induced autoimmune hepatitis (DIH) is the most common hepatic drug-induced hypersensitization process observed in approximately 9 to 12% of patients with autoimmune hepatitis. The overwhelming majority of patients with DIH are women. The underlying mechanisms of these sex differences in prevalence are unclear because of the paucity of animal models that mimic human disease. Even so, underlying mechanisms are widely believed to be associated with human leukocyte antigen haplotypes and sex hormones. In contrast, using a DIH mouse model, we have uncovered that IL-4 initiated&#160;CD4+ T cells directed against an epitope of cytochrome P450 2E1 induces influx of neutrophils, macrophages and mast cells into the livers of female BALB/c mice. Using this model, we have also shown that IL-33-induced FoxP3+regulatory T cells confer protection against DIH in female and male mice. This DIH model is induced by immunizing mice with an epitope of CYP2E1 that has been covalently altered with a drug metabolite that has been associated with DIH. This epitope is recognized by patients with DIH. Our method induces robust and reproducible hepatitis and autoantibodies that can be utilized to study the pathogenesis of DIH. While in vivo studies can cause undue pain and distress in mice when done improperly, the advantage of an in vivo model is the ability to evaluate the pathogenesis of disease in a large number of mice. Additionally, biological effects of the altered liver proteins can be studied using invasive procedures. The addition of in vitro studies to the experimental design allows rapid repetition and mechanistic analysis at a cellular level. Thus, we will demonstrate our model protocol and how it can be utilized to study in vivo and in vitro mechanisms of DIH.

We describe an in vivo immunization, translational hepatitis model in BALB/c mice that can be utilized to study the pathogenesis of drug-induced autoimmune hepatitis including sex differences seen in this disease. We will describe how this model demonstrates reproducible analyses using in vivo and in vitro experimental techniques.

Inducción de hepatitis autoinmune inducida por fármacos en ratones BALB/c para el estudio de sus mecanismos patógenos

Drug-induced autoimmune hepatitis (DIH) is the most common hepatic drug-induced hypersensitization process observed in approximately 9 to 12% of patients ...

Visualizing Impairment of the Endothelial and Glial Barriers of the Neurovascular Unit during Experimental Autoimmune Encephalomyelitis In Vivo

The neurovascular unit (NVU) is composed of microvascular endothelial cells forming the blood-brain barrier (BBB), an endothelial basement membrane with embedded pericytes, and the glia limitans composed by the parenchymal basement membrane and astrocytic end-feed embracing the abluminal aspect of central nervous system (CNS) microvessels. In addition to maintaining CNS homeostasis the NVU controls immune cell trafficking into the CNS. During immunosurveillance of the CNS low numbers of activated lymphocytes can cross the endothelial barrier without causing BBB dysfunction or clinical disease. In contrast, during neuroinflammation such as in multiple sclerosis or its animal model experimental autoimmune encephalomyelitis (EAE) a large number of immune cells can cross the BBB and subsequently the glia limitans eventually reaching the CNS parenchyma leading to clinical disease. 
Immune cell migration into the CNS parenchyma is thus a two-step process that involves a sequential migration across the endothelial and glial barrier of the NVU employing distinct molecular mechanisms. If following their passage across the endothelial barrier, T cells encounter their cognate antigen on perivascular antigen-presenting cells their local reactivation will initiate subsequent mechanisms leading to the focal activation of gelatinases, which will enable the T cells to cross the glial barrier and enter the CNS parenchyma. Thus, assessing both, BBB permeability and MMP activity in spatial correlation to immune cell accumulation in the CNS during EAE allows to specify loss of integrity of the endothelial and glial barriers of the NVU. 
We here show how to induce EAE in C57BL/6 mice by active immunization and how to subsequently analyze BBB permeability in vivo using a combination of exogenous fluorescent tracers. We further show, how to visualize and localize gelatinase activity in EAE brains by in situ zymogaphy coupled to immunofluorescent stainings of BBB basement membranes and CD45+ invading immune cells.

Here, we present protocols to investigate impairment of the neurovascular unit during experimental autoimmune encephalomyelitis in vivo. We specifically address how to determine blood-brain barrier permeability and gelatinase activity involved in leukocyte migration across the glia limitans.&#160;

Visualizar el deterioro de las barreras endoteliales y Glial de la unidad Neurovascular durante la encefalomielitis Autoinmune Experimental In Vivo

The neurovascular unit (NVU) is composed of microvascular endothelial cells forming the blood-brain barrier (BBB), an endothelial basement membrane with ...

Flow Cytometric Analysis of Lymphocyte Infiltration in Central Nervous System during Experimental Autoimmune Encephalomyelitis

Multiple sclerosis (MS) is an autoimmune disease of the central nervous system (CNS) caused by the combination of environmental factors and susceptible genetic background. Experimental autoimmune encephalomyelitis (EAE) is a typical disease model of MS widely used for investigating the pathogenesis in which T lymphocytes specific for myelin antigens initiate an inflammatory reaction in CNS. It is very important to assess how lymphocytes in the CNS regulate the development of disease. However, the approach for measuring the quantity and quality of infiltrated lymphocytes in the CNS is very limited due to the difficulties in isolating and detecting infiltrated lymphocytes from the brain. This manuscript presents a protocol for that is useful for the isolation, identification, and characterization of infiltrated lymphocytes from the CNS and will be helpful for our understanding of how lymphocytes are involved in the development of the CNS autoimmune disease.

This manuscript presents a protocol to induce active experimental autoimmune encephalomyelitis (EAE) in mice. A method for the isolation and characterization of the infiltrated lymphocytes in the central nervous system (CNS) is also presented to show how lymphocytes are involved in the development of CNS autoimmune disease.

Análisis citométrico de flujo de infiltración de linfocitos en el sistema nervioso central durante la encefalomielitis autoinmune experimental

Multiple sclerosis (MS) is an autoimmune disease of the central nervous system (CNS) caused by the combination of environmental factors and susceptible ...

Experimental Autoimmune Uveitis: An Intraocular Inflammatory Mouse Model

Experimental Autoimmune Uveitis (EAU) is driven by immune cells responding to self-antigens. Many features of this non-infectious, intraocular inflammatory disease model recapitulate the clinical phenotype of posterior uveitis affecting humans. EAU has been used reliably to study the efficacy of novel inflammatory therapeutics, their mode of action and to further investigate the mechanisms that underpin disease progression of intraocular disorders. Here, we provide a detailed protocol on EAU induction in the C57BL/6J mouse - the most widely used model organism with susceptibility to this disease. Clinical assessment of disease severity and progression will be demonstrated using fundoscopy, histological examination and fluorescein angiography. The induction procedure involves subcutaneous&#160;injection of an emulsion containing a peptide (IRBP1-20) from the ocular protein interphotoreceptor retinoid binding protein (also known as retinol binding protein 3), Complete Freund&#39;s Adjuvant (CFA) and supplemented with killed Mycobacterium tuberculosis. Injection of this viscous emulsion on the back of the neck is followed by a single intraperitoneal injection of Bordetella pertussis toxin. At the onset of symptoms (day 12-14) and under general anesthesia, fundoscopic images are taken to assess disease progression through clinical examination. These data can be directly compared with those at later timepoints and peak disease (day 20-22) with differences analyzed. At the same time, this protocol allows the investigator to assess potential differences in vessel permeability and damage using fluorescein angiography. EAU can be induced in other mouse strains - both wildtype or genetically modified - and combined with novel therapies offering flexibility for studying drug efficacy and/or disease mechanisms.

In this report we present a protocol that allows the investigator to generate a mouse model of intraocular uveitis. More commonly referred to as experimental autoimmune uveitis (EAU), this established model captures many aspects of human disease. Herein, we will describe how to induce and monitor disease progression using several readouts.

Preparación de inmunógeno ratón hipófisis para la inducción de la hipofisitis autoinmune experimental

Resumen

Explorar más videos

Capítulos en este video