El Dr. Njoku desea agradecer al Dr. Noel R. Rose, MD PhD, por su orientación y discusiones perspicaces que resultaron en la formulación de este modelo.

<ol>
	<li>Castiella, A., Zapata, E., Lucena, M. I., Andrade, 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=Drug-induced+autoimmune+liver+disease:+A+diagnostic+dilemma+of+an+increasingly+reported+disease.">Drug-induced autoimmune liver disease: A diagnostic dilemma of an increasingly reported disease.</a> World J. Hepatology. 6 (4), 160-168 (2014).</li><li>Bjornsson, E. S., Bergmann, O. M., Bjornsson, H. K., Kvaran, R. B., Olafsson, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Incidence,+presentation,+and+outcomes+in+patients+with+drug-induced+liver+injury+in+the+general+population+of+Iceland.">Incidence, presentation, and outcomes in patients with drug-induced liver injury in the general population of Iceland.</a> Gastroenterology. 144 (7), 1419-1425 (2013).</li><li>Castiella, A., Lucena, M. I., Zapata, E. M., Otazua, P., Andrade, 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=Drug-induced+autoimmune-like+hepatitis:+a+diagnostic+challenge.">Drug-induced autoimmune-like hepatitis: a diagnostic challenge.</a> Digestive Diseases and Sciences. 56 (8), 2501-2502 (2011).</li><li>Czaja, A. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Drug-induced+autoimmune-like+hepatitis.">Drug-induced autoimmune-like hepatitis.</a> Digestive Diseases and Sciences. 56 (4), 958-976 (2011).</li><li>Pohl, L. R., Thomassen, D., Pumford, N. R., Butler, L. E., Satoh, H., Ferrans, V. J., Perrone, A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Hapten+carrier+conjugates+associated+with+halothane+hepatitis.">Hapten carrier conjugates associated with halothane hepatitis.</a> Advances in Experimental Medicine and Biology. 283, 111-120 (1991).</li><li>Njoku, D. B., Talor, M. V., Fairweather, D., Frisancho-Kiss, S., Odumade, O. A., 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+novel+model+of+drug+hapten-induced+hepatitis+with+increased+mast+cells+in+the+BALB/c+mouse.">A novel model of drug hapten-induced hepatitis with increased mast cells in the BALB/c mouse.</a> Experimental and Molecular Pathology. 78 (2), 87-100 (2005).</li><li>Cottagiri, M., Nyandjo, M., Stephens, M., Mantilla, J., Saito, H., Mackay, I. R., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=In+drug-induced,+immune-mediated+hepatitis,+interleukin-33+reduces+hepatitis+and+improves+survival+independently+and+as+a+consequence+of+FoxP3++T-cell+activity.">In drug-induced, immune-mediated hepatitis, interleukin-33 reduces hepatitis and improves survival independently and as a consequence of FoxP3+ T-cell activity.</a> Cellular and Molecular Immunology. , (2018).</li><li>Lohse, A. W., Manns, M., Dienes, H. P., Meyer zum Buschenfelde, K. H., Cohen, I. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Experimental+autoimmune+hepatitis:+disease+induction,+time+course+and+T-cell+reactivity.">Experimental autoimmune hepatitis: disease induction, time course and T-cell reactivity.</a> Hepatology. 11 (1), 24-30 (1991).</li><li>McCarthy, E. K., Vakos, A., Cottagiri, M., Mantilla, J. J., Santhanam, L., Thomas, D. L., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Identification+of+a+Shared+Cytochrome+p4502E1+Epitope+Found+in+Anesthetic+Drug-Induced+and+Viral+Hepatitis.">Identification of a Shared Cytochrome p4502E1 Epitope Found in Anesthetic Drug-Induced and Viral Hepatitis.</a> mSphere. 3 (5), (2018).</li><li>Cho, J., Kim, L., Li, Z., Rose, N. R., Talor, M. V., Njoku, 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=Sex+bias+in+experimental+immune-mediated,+drug-induced+liver+injury+in+BALB/c+mice:+suggested+roles+for+Tregs,+estrogen,+and+IL-6.">Sex bias in experimental immune-mediated, drug-induced liver injury in BALB/c mice: suggested roles for Tregs, estrogen, and IL-6.</a> PLoS. One. 8 (4), 61186 (2013).</li><li>Satoh, H., Gillette, J. R., Takemura, T., Ferrans, V. J., Jelenich, S. E., Kenna, J. G., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Investigation+of+the+immunological+basis+of+halothane-induced+hepatotoxicity.">Investigation of the immunological basis of halothane-induced hepatotoxicity.</a> Advances in Experimental Medicine and Biology. 197, 657-673 (1986).</li><li>Eliasson, E., Kenna, J. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cytochrome+P450+2E1+is+a+cell+surface+autoantigen+in+halothane+hepatitis.">Cytochrome P450 2E1 is a cell surface autoantigen in halothane hepatitis.</a> Molecular Pharmacology. 50 (3), 573-582 (1996).</li><li>Bourdi, M., Chen, W., Peter, R. M., Martin, J. L., Buters, J. T., Nelson, S. D., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Human+cytochrome+P450+2E1+is+a+major+autoantigen+associated+with+halothane+hepatitis.">Human cytochrome P450 2E1 is a major autoantigen associated with halothane hepatitis.</a> Chemical Research in Toxicology. 9 (7), 1159-1166 (1996).</li><li>Njoku, D. B., Li, Z., Washington, N. D., Mellerson, J. L., Talor, M. V., Sharma, R., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Suppressive+and+pro-inflammatory+roles+for+IL-4+in+the+pathogenesis+of+experimental+drug-induced+liver+injury.">Suppressive and pro-inflammatory roles for IL-4 in the pathogenesis of experimental drug-induced liver injury.</a> European Journal of Immunology. 39 (6), 1652-1663 (2009).</li><li>Aithal, G. P., Ramsay, L., Daly, A. K., Sonchit, N., Leathart, J. B., Alexander, G., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Hepatic+adducts,+circulating+antibodies,+and+cytokine+polymorphisms+in+patients+with+diclofenac+hepatotoxicity.">Hepatic adducts, circulating antibodies, and cytokine polymorphisms in patients with diclofenac hepatotoxicity.</a> Hepatology. 39 (5), 1430-1440 (2004).</li><li>Higuchi, S., Kobayashi, M., Yoshikawa, Y., Tsuneyama, K., Fukami, T., Nakajima, M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=IL-4+mediates+dicloxacillin-induced+liver+injury+in+mice.">IL-4 mediates dicloxacillin-induced liver injury in mice.</a> Toxicology Letters. 200 (3), 139-145 (2011).</li><li>Rubtsova, K., Marrack, P., Rubtsov, A. V. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Sexual+dimorphism+in+autoimmunity.">Sexual dimorphism in autoimmunity.</a> Journal of Clinical Investigation. 125 (6), 2187-2193 (2015).</li><li>Satoh, H., Fukuda, Y., Anderson, D. K., Ferrans, V. J., Gillette, J. R., Pohl, L. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Immunological+studies+on+the+mechanism+of+halothane-induced+hepatotoxicity:+immunohistochemical+evidence+of+trifluoroacetylated+hepatocytes.">Immunological studies on the mechanism of halothane-induced hepatotoxicity: immunohistochemical evidence of trifluoroacetylated hepatocytes.</a> Journal of Pharmacology and Experimental Therapeutics. 233 (3), 857-862 (1985).</li><li>Habeeb, A. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Determination+of+free+amino+groups+in+proteins+by+trinitrobenzenesulfonic+acid.">Determination of free amino groups in proteins by trinitrobenzenesulfonic acid.</a> Analytical Biochemistry. 14 (3), 328-336 (1966).</li><li>Christen, U., Burgin, M., Gut, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Halothane+metabolism:+immunochemical+evidence+for+molecular+mimicry+of+trifluoroacetylated+liver+protein+adducts+by+constitutive+polypeptides.">Halothane metabolism: immunochemical evidence for molecular mimicry of trifluoroacetylated liver protein adducts by constitutive polypeptides.</a> Molecular Pharmacology. 40 (3), 390-400 (1991).</li><li>Christen, U., Quinn, J., Yeaman, S. J., Kenna, J. G., Clarke, J. B., Gandolfi, A. J., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Identification+of+the+dihydrolipoamide+acetyltransferase+subunit+of+the+human+pyruvate+dehydrogenase+complex+as+an+autoantigen+in+halothane+hepatitis.+Molecular+mimicry+of+trifluoroacetyl-lysine+by+lipoic+acid.">Identification of the dihydrolipoamide acetyltransferase subunit of the human pyruvate dehydrogenase complex as an autoantigen in halothane hepatitis. Molecular mimicry of trifluoroacetyl-lysine by lipoic acid.</a> European Journal of Biochemistry. 223 (3), 1035-1047 (1994).</li></ol>

Los autores no tienen nada que revelar.

La fuerza de este protocolo radica en su reproducibilidad; por lo tanto, es fundamental cumplir con los pasos sugeridos. La formulación del inmunógeno puede ser una barrera para algunos; sin embargo, hemos reproducido nuestro modelo utilizando el epítopo descrito en nuestro documento, que elimina la necesidad de aislar la fracción S100 del hígado. Es probable que se puedan alterar epítopos o proteínas adicionales e inducir hepatitis después de las inmunizaciones; sin embargo, describimos aquellas proteínas que h...

El propósito de este método es describir un modelo de ratón de hepatitis autoinmune inducida por fármacos que se desarrolla in vivo y demostrar cómo se puede utilizar para investigar las bases moleculares, inmunológicas y genéticas de esta enfermedad. El objetivo a largo plazo de nuestros estudios es descubrir mecanismos responsables del desarrollo de inflamación y lesión hepática crónica mediante el estudio de la DIH en pacientes susceptibles. La enfermedad hepática y la cirrosis constituyen la sexta causa más común de muerte en adultos entre las edades de 25 y 64 años. El DILI idiosincrásico, a veces denominado hepatitis autoinmune inducida por medicamentos (DIH, por sus siglas en inglés) es la tercera causa más común de insuficiencia hepática aguda en los Estados Unidos. DiH es el proceso de hipersensibilización inducido por fármacos hepáticos más común observado en aproximadamente 9 a 12% de los pacientes con hepatitis1 autoinmune. La abrumadora mayoría de los pacientes con DIH son mujeres 2,3,4. Un tipo de DIH se desarrolla en individuos susceptibles después de la administración de anestésicos volátiles halogenados como isoflurano, sevoflurano, desflurano o halotano. Estos anestésicos se unen covalentemente a las proteínas hepáticas con productos reactivos de su metabolismo, creando así nuevos autoantígenos capaces de provocar respuestas alérgicas o autoinmunes5.
El estudio de los mecanismos patógenos involucrados en el desarrollo de anestésicos y cualquier forma de DIH se ha visto obstaculizado previamente por la falta de un modelo animal que imite de cerca la inducción de la enfermedad humana. Hemos desarrollado un modelo murino experimental de DIH con características que se asemejan a DILI inmunomediado en pacientes. La hepatitis es inducida por la inmunización con uno de los dos autoantígenos que han sido modificados covalentemente por el metabolito cloruro de trifluoroacetilo (TFA) que se forma después del metabolismo oxidativo del anestésico por la enzima citocromo P450 2E1 (CYP2E1)5. Un autoantígeno es la fracción hepática citosólica S100 hepática, que es una mezcla de varias proteínas6, y el segundo autoantígeno es un epítopo de CYP2E1 que es reconocido por sueros de pacientes con DILI7 inmunomediado con anestesia. Mediante el uso de ratones BALB/c, que son relativamente resistentes a la hepatitis autoinmune experimental, distinguimos nuestro modelo del modelo de inmunización inducido por S100 de hepatitis autoinmune en ratones C57Bl/6J8.
Debido a sus diversas presentaciones clínicas, la DIH es difícil de estudiar en pacientes. Los modelos experimentales traslacionales ofrecen la capacidad de evaluar la patogénesis de la enfermedad in vivo e in vitro. En la actualidad, no existen otros métodos alternativos para inducir diH que examinen completamente las respuestas inmunes adaptativas o innatas in vivo o in vitro sin el uso de animales. Además, dado que la trifluoroacetilación de S-100 o del epítopo CYP2E1 no parece producir un inmunógeno irritante, y estamos induciendo DIH mediante la inmunización con proteínas alteradas por TFA, estos animales no recibirán éter, ningún anestésico halogenado, barbitúrico o alcohol antes de la inmunización u otros procedimientos, considerando que estos agentes pueden alterar los parámetros que estamos estudiando. Aun así, hemos disminuido nuestro uso de ratones mediante el uso de simulación por computadora para confirmar las preferencias de unión de nuestro epítopo CYP2E1descubierto 9 y hemos reflejado el DIH humano que implica el sexo femenino al demostrar que los ratones hembra BALB / c desarrollan un DIH10 más severo.
A pesar de las diversas presentaciones de DIH en pacientes y los desafíos en el estudio de la enfermedad clínica, la modificación post-traduccional de proteínas nativas por metabolitos reactivos de fármacos es un mecanismo clave aceptado en la patogénesis DIH que sigue a los anestésicos halogenados11. Los investigadores también aceptan que cyp2E1 es un autoantígeno importante en este proceso12,13. El papel de las células T CD4+reguladas por la interleucina (IL)-4-upregulated que reconocen un CYP2E1 modificado post-traduccionalmente y otras proteínas hepáticas es un iniciador aceptado de DIH anestésico al atraer neutrófilos, eosinófilos y mastocitos al hígado14, y este mecanismo se ha confirmado en muchas formas de DIH15,16. Las células T CD4+CD25+(Tregs) que expresan FoxP3 inducidas reducen la gravedad de la DIH, y las deficiencias relativas de estas células en el bazo empeoran la DIH 10,7. Por lo tanto, la mayoría de los avances en la comprensión de la DIH han sido posibles mediante la utilización de modelos de ratón in vivo para evaluar los mecanismos genéticos, metabólicos e inmunológicos de la DIH tanto in vivo como in vitro.
Debido a que nosotros y otros investigadores hemos descubierto roles para IL-4, neutrófilos y eosinófilos en el inicio de DIH utilizando diferentes modelos de ratón, creemos que esta observación apoya nuestra afirmación de que, independientemente del modelo DIH utilizado, la hepatitis y las lesiones son inducidas por IL-4. La fuerza de nuestro protocolo radica en la utilización de la metodología in vivo, tanto en ratones machos como hembras, y la repetición de histología, ensayos de proliferación de células T CD4+ y citoquinas. La fuerza de nuestro uso de estudios in vitro es que reducen el número de ratones necesarios al tiempo que proporcionan la metodología para aislar las interacciones celulares que impulsan la DIH. Recomendamos el uso de ratones machos y hembras porque esto reduce la posibilidad de sesgo inconsciente en la interpretación de los resultados y fortalece el potencial de traducción de nuestros estudios, ya que la incidencia, prevalencia y gravedad de la DIH es mayor en las mujeres17. Recomendamos que los ratones se obtengan de un solo proveedor; sin embargo, si esto no es posible, obtenga controles de pareja de camada o ratones de tipo salvaje del mismo proveedor que los ratones genéticamente alterados.

<table border="0" cellpadding="0" cellspacing="0" style="width:572px;" width="573">
	<colgroup>
		<col />
		<col />
		<col />
		<col />
	</colgroup>
	<tbody>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">0.1% 2,4,6-trinitrobenzene sulfonic acid (TNBS)</td>
			<td style="width:71px;">ThermoFisher</td>
			<td align="right" style="width:119px;">28997</td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">AKP Substrate Kit</td>
			<td style="width:71px;">BioRad</td>
			<td style="width:119px;">172-1063</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">BALB/c mice</td>
			<td style="width:71px;">Jackson</td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">CellTrace&#8482; CFSE Cell Proliferation Kit</td>
			<td style="width:71px;">ThermoFisher</td>
			<td style="width:119px;">C34554</td>
			<td></td>
		</tr>
		<tr height="84">
			<td height="84" style="height:84px;width:216px;">CFA H37Ra</td>
			<td style="width:71px;">Becton Dickinson (Difco Bacto)</td>
			<td align="right" style="width:119px;">231131</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">FcR Blocking reagent</td>
			<td style="width:71px;">Milteyi</td>
			<td>130-092-575</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">General supplement</td>
			<td style="width:71px;">ThermoFisher</td>
			<td style="width:119px;">HPRG770</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">HepaRG&#8482; cells cryopreserved</td>
			<td style="width:71px;">ThermoFisher</td>
			<td style="width:119px;">HPR GC10</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">Live/Dead Fixable Aqua Dead Cell stain kit&#160;</td>
			<td style="width:71px;">ThermoFisher</td>
			<td style="width:119px;">L34965</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">NaHC03</td>
			<td style="width:71px;">Millipore Sigma</td>
			<td style="width:119px;">S5761</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">Percoll&#174;</td>
			<td style="width:71px;">Millipore Sigma</td>
			<td style="width:119px;">P1644-1L</td>
			<td></td>
		</tr>
		<tr height="63">
			<td height="63" style="height:63px;width:216px;">Pertussis Toxin</td>
			<td style="width:71px;">List Biologicals</td>
			<td align="right" style="width:119px;">180</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">Phosphate Buffered Saline pH 7.4</td>
			<td style="width:71px;">Various</td>
			<td style="width:119px;"></td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">Pierce&#8482; Protease Inhibitor Mini Tablets, EDTA Free</td>
			<td style="width:71px;">ThermoFisher</td>
			<td align="right" style="width:119px;">88666</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">Potassium Hydroxide</td>
			<td style="width:71px;">JT Baker</td>
			<td style="width:119px;">3140-01</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">S-ethyltrifluorothioacetate (S-ETFA)</td>
			<td style="width:71px;">Millipore Sigma</td>
			<td align="right" style="width:119px;">177474</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">Slide-a-lyzer dialysis cassettes (10 K, 12 ml)</td>
			<td style="width:71px;">ThermoFisher</td>
			<td align="right" style="width:119px;">66810</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">UltraPure&#8482; SDS Solution, 10%</td>
			<td style="width:71px;">ThermoFisher</td>
			<td align="right" style="width:119px;">24730020</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">Williams Media E, no phenol red</td>
			<td style="width:71px;">ThermoFisher</td>
			<td style="width:119px;">A1217601</td>
			<td></td>
		</tr>
	</tbody>
</table>

induction of drug-induced, autoimmune hepatitis in balb/c mice for the study of its pathogenic mechanisms

La hepatitis autoinmune inducida por fármacos (DIH) es el proceso de hipersensibilización inducido por fármacos hepáticos más común observado en aproximadamente el 9 al 12% de los pacientes con hepatitis autoinmune. La abrumadora mayoría de los pacientes con DIH son mujeres. Los mecanismos subyacentes de estas diferencias de sexo en la prevalencia no están claros debido a la escasez de modelos animales que imitan la enfermedad humana. Aun así, se cree ampliamente que los mecanismos subyacentes están asociados con los haplotipos de antígenos leucocitarios humanos y las hormonas sexuales. En contraste, utilizando un modelo de ratón DIH, hemos descubierto que las células T CD4 + iniciadas por IL-4 dirigidas contra un epítopo del citocromo P450 2E1 inducen la afluencia de neutrófilos, macrófagos y mastocitos en los hígados de ratones hembra BALB / c. Usando este modelo, también hemos demostrado que las células T reguladoras FoxP3 + inducidas por IL-33 confieren protección contra DIH en ratones hembras y machos. Este modelo de DIH es inducido por la inmunización de ratones con un epítopo de CYP2E1 que ha sido alterado covalentemente con un metabolito del fármaco que se ha asociado con DIH. Este epítopo es reconocido por pacientes con DIH. Nuestro método induce hepatitis y autoanticuerpos robustos y reproducibles que se pueden utilizar para estudiar la patogénesis de la DIH. Si bien los estudios in vivo pueden causar dolor y angustia indebidos en ratones cuando se realizan incorrectamente, la ventaja de un modelo in vivo es la capacidad de evaluar la patogénesis de la enfermedad en un gran número de ratones. Además, los efectos biológicos de las proteínas hepáticas alteradas se pueden estudiar mediante procedimientos invasivos. La adición de estudios in vitro al diseño experimental permite una rápida repetición y análisis mecanicista a nivel celular. Por lo tanto, demostraremos nuestro protocolo modelo y cómo se puede utilizar para estudiar los mecanismos in vivo e in vitro de DIH.

El calendario de inmunización utilizado para inducir diH que se muestra en la Figura 1 representa las dos inmunizaciones requeridas en la base del cuello (día 0) y la base de la cola (día 7). La Figura 2 muestra datos representativos de proliferación obtenidos en el día 14 utilizando CFSE en respuesta a CYP2E1, JHDN5, el epítopo CYP2E1 y el metabolito trifluoroacetilo (TFA) de los anestésicos. La Figura 3 muestra la estrategi...

Watch this Scientific Journal Video about Induction of Drug-Induced, Autoimmune Hepatitis in BALB/c Mice for the Study of Its Pathogenic Mechanisms at JoVE.com

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

Describimos un modelo de inmunización in vivo, traslacional de hepatitis en ratones BALB / c que se puede utilizar para estudiar la patogénesis de la hepatitis autoinmune inducida por medicamentos, incluidas las diferencias de sexo observadas en esta enfermedad. Describiremos cómo este modelo demuestra análisis reproducibles utilizando técnicas experimentales in vivo e in vitro.

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 ...

induction-drug-induced-autoimmune-hepatitis-balbc-mice-for-study-its

Research

JoVE Journal

Immunology and Infection

2.9K vistas.  Johns Hopkins University. Describimos un modelo de inmunización in vivo, traslacional de hepatitis en ratones BALB / c que se puede utilizar para estudiar la patogénesis de la hepatitis autoinmune inducida por medicamentos, incluidas las diferencias de sexo observadas en esta enfermedad. Describiremos cómo este modelo demuestra análisis reproducibles utilizando técnicas experimentales in vivo e in vitro.

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

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

Autoimmune hypophysitis is a chronic inflammation of the pituitary gland caused or accompanied by autoimmunity1. It has traditionally been considered a rare disease but reporting has increased markedly in recent years. Hypophysitis, in fact, develops not uncommonly as a "side effect" in cancer patients treated with antibodies that block inhibitory receptors expressed on T lymphocytes, such as CTLA-42 and PD-1 receptors. Autoimmune hypophysitis can be induced experimentally by injecting mice with pituitary proteins mixed with an adjuvant3. In this video article we demonstrate how to extract proteins from mouse pituitary glands and how to prepare them in a form suitable for inducing autoimmune hypophysitis in SJL mice.

Autoimmune hypophysitis can be reproduced in mice by injecting an extract of mouse pituitary proteins.

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 ...

Investigación

Inmunología e Infección

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 ...

Determination of Tolerable Fatty Acids and Cholera Toxin Concentrations Using Human Intestinal Epithelial Cells and BALB/c Mouse Macrophages

The positive role of fatty acids in the prevention and alleviation of non-human and human diseases have been and continue to be extensively documented. These roles include influences on infectious and non-infectious diseases including prevention of inflammation as well as mucosal immunity to infectious diseases. Cholera is an acute intestinal illness caused by the bacterium Vibrio cholerae. It occurs in developing nations and if left untreated, can result in death. While vaccines for cholera exist, they are not always effective and other preventative methods are needed. We set out to determine tolerable concentrations of three fatty acids (oleic, linoleic and linolenic acids) and cholera toxin using mouse BALB/C macrophages and human intestinal epithelial cells, respectively. We solubilized the above fatty acids and used cell proliferation assays to determine the concentration ranges and specific concentrations of the fatty acids that are not detrimental to human intestinal epithelial cell viability. We solubilized cholera toxin and used it in an assay to determine the concentration ranges and specific concentrations of cholera toxin that do not statistically decrease cell viability in BALB/C macrophages. 
We found the optimum fatty acid concentrations to be between 1-5 ng/&mu;l, and that for cholera toxin to be &lt; 30 ng per treatment. This data may aid future studies that aim to find a protective mucosal role for fatty acids in prevention or alleviation of cholera infections.

We set out to determine tolerable concentrations of three fatty acids (oleic, linoleic and linolenic acids) and cholera toxin that did not significantly and adversely affect cell survival by solubilizing the fatty acids and the toxin and using them in cell survival assays.

Determinación de los ácidos grasos tolerables y Concentraciones toxina del cólera El uso de células epiteliales intestinales humanas y de ratón BALB / c Macrófagos

The positive role of fatty acids in the prevention and alleviation of non-human and  human diseases have been and continue to be extensively documented. ...

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 ...

Induction of Murine Intestinal Inflammation by Adoptive Transfer of Effector CD4+CD45RBhigh T Cells into Immunodeficient Mice

There are many different animal models available for studying the pathogenesis of human inflammatory bowel diseases (IBD), each with its own advantages and disadvantages. We describe here an experimental colitis model that is initiated by adoptive transfer of syngeneic splenic CD4+CD45RBhigh T cells into T and B cell deficient recipient mice. The CD4+CD45RBhigh T cell population that largely consists of na&#239;ve effector cells is capable of inducing chronic intestinal inflammation, closely resembling key aspects of human IBD. This method can be manipulated to study aspects of disease onset and progression. Additionally it can be used to study the function of innate, adaptive, and regulatory immune cell populations, and the role of environmental exposures, i.e., the microbiota, in intestinal inflammation. In this article we illustrate the methodology for inducing colitis with a step-by-step protocol. This includes a video demonstration of key technical aspects required to successfully develop this murine model of experimental colitis for research purposes.

Induction of Murine Intestinal Inflammation by Adoptive Transfer of Effector CD4+CD45RBhigh T Cells into Immunodeficient Mice

Here, we present a protocol to induce colonic inflammation in mice by adoptive transfer of syngeneic CD4+CD45RBhigh T cells into T and B cell deficient recipients. Clinical and histopathological features mimic human inflammatory bowel diseases. This method allows the study of the initiation of colonic inflammation and progression of disease.

La inducción de la inflamación intestinal murino por transferencia adoptiva de Efector CD4<sup&gt; +</sup&gt; CD45RB<sup&gt; Alta</sup&gt; T células en ratones inmunodeficientes

There are many different animal models available for studying the pathogenesis of human inflammatory bowel diseases (IBD), each with its own advantages ...

Immunofluorescence to Monitor the Cellular Uptake of Human Lactoferrin and its Associated Antiviral Activity Against the Hepatitis C Virus

Immunofluorescence is a laboratory technique commonly used to study many aspects of biology. It is typically used to visualize the distribution and/or localization of a target molecule in cells and tissues. Immunofluorescence relies on the specificity of fluorescent-labelled antibodies against their corresponding antigens within a cell. Both direct and indirect immunofluorescence approaches can be used which rely on the use of antibodies linked with a fluorochrome. Direct immunofluorescence is less frequently used because it provides lower signal, involves higher cost and less flexibility. In contrast, indirect immunofluorescence is more commonly used because of its high sensitivity and provides an amplified signal since more than one secondary antibody can attach to each primary antibody. In this manuscript, both epifluorescence microscopy and confocal microscopy were used to monitor the internalization of human lactoferrin, an important component of the immune system, into hepatic cells. Moreover, we monitored the inhibitory potential of hLF on the intracellular replication of the Hepatitis C virus using immunofluorescence. Both the advantages and disadvantages associated with these approaches are discussed.

The human lactoferrin (hLF) is a component of the immune system. In this study, immunofluorescence assays are used to demonstrate both the hepatocellular uptake of hLF and a qualitative reduction in the hepatitis C virus replication upon treatment with hLF.

La inmunofluorescencia para supervisar la captación celular de lactoferrina humana y su Asociado actividad antiviral contra el virus de hepatitis C

Immunofluorescence is a laboratory technique commonly used to study many aspects of biology. It is typically used to visualize the distribution and/or ...

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) ...

Development of a Hepatitis B Virus Reporter System to Monitor the Early Stages of the Replication Cycle

Currently, it is possible to construct recombinant forms of various viruses, such as human immunodeficiency virus 1 (HIV-1) and hepatitis C virus (HCV), that carry foreign genes such as a reporter or marker protein in their genomes. These recombinant viruses usually faithfully mimic the life cycle of the original virus in infected cells and exhibit the same host range dependence. The development of a recombinant virus enables the efficient screening of inhibitors and the identification of specific host factors. However, to date the construction of recombinant hepatitis B virus (HBV) has been difficult because of various experimental limitations. The main limitation is the compact genome size of HBV, and a fairly strict genome size that does not exceed 1.3 genome sizes, that must be packaged into virions. Thus, the size of a foreign gene to be inserted should be smaller than 0.4 kb if no deletion of the genome DNA is to be performed. Therefore, to overcome this size limitation, the deletion of some HBV DNA is required. Here, we report the construction of recombinant HBV encoding a reporter gene to monitor the early stage of the HBV replication cycle by replacing part of the HBV core-coding region with the reporter gene by deleting part of the HBV pol coding region. Detection of recombinant HBV infection, monitored by the reporter activity, was highly sensitive and less expensive than detection using the currently available conventional methods to evaluate HBV infection. This system will be useful for a number of applications including high-throughput screening for the identification of anti-HBV inhibitors, host factors and virus-susceptible cells.

Here we describe a newly developed hepatitis B virus (HBV) reporter system to monitor the early stages of the HBV life cycle. This simplified in vitro system will aid in the screening of anti-HBV agents using a high-throughput strategy.

Desarrollo de un sistema reportero virus de la hepatitis B para supervisar las primeras etapas del ciclo de replicación

Currently, it is possible to construct recombinant forms of various viruses, such as human immunodeficiency virus 1 (HIV-1) and hepatitis C virus (HCV), ...

Induction of Intestinal Graft-versus-host Disease and Its Mini-endoscopic Assessment in Live Mice

Acute graft-versus-host disease (GvHD) represents the most severe complication that patients previously undergoing allogeneic hematopoietic stem cell transplantation (allo-HCT) face and is frequently associated with a poor clinical outcome. While, for instance, GvHD manifestations of the skin are usually responsive to established immune-suppressive therapies and are, hence, not taking a fatal course, the presence and the intensity of intestinal GvHD, especially of the mid-to-lower parts of the gut, strongly influence the outcome and overall survival of patients with acute GvHD. Therapeutic options are essentially limited to the classic immune-suppressive agents yielding only moderate disease-mitigating effects. Hence, detailed knowledge about the tissue-resident immune cascade, changes in the intestinal microbiota, and the stromal response prior, upon, and after intestinal GvHD onset are urgently needed to understand the events and mechanisms underlying its pathogenesis and to develop innovative therapeutic options. Murine models of GvHD are frequently employed to identify and functionally assess molecules and pathways putatively driving intestinal GvHD. However, means to specifically monitor and evaluate intestinal inflammation over time are essentially lacking since established scores to assess and grade acute GvHD are routinely comprised of various parameters which rather reflect&#160;systemic GvHD manifestations. The detailed evaluation of intestinal GvHD has been restricted to studies using euthanized mice, thereby essentially excluding longitudinal (i.e., kinetic) analyses of the colonic compartment under a given experimental condition (e.g., antibody-mediated blockade of a proinflammatory cytokine) in live mice (i.e., in vivo). The mini-endoscopic in situ assessment of the distal colon of allo-HCT-treated mice described here allows a) a detailed macroscopic evaluation of different aspects of intestinal inflammation and b) the option to collect tissue samples for downstream analyses at various time points over the course of the observation period. Overall, the mini-endoscopic approach provides a major advance in preclinical noninvasive monitoring and assessment of intestinal GvHD.

Here, we present a protocol that describes allogeneic hematopoietic stem cell transplantation and allows repetitive mini-endoscopic evaluations of the distal colon in situ for the presence, characteristics, and severity of colonic inflammation within live mice suffering from intestinal graft-versus-host disease.

Inducción de Intestinal injerto - versus - host Disease y su evaluación Mini-endoscópica en ratones vivos

Acute graft-versus-host disease (GvHD) represents the most severe complication that patients previously undergoing allogeneic hematopoietic stem cell ...

Adoptive Immunotherapy of iNKT Cells in Glucose-6-Phosphate Isomerase (G6PI)-Induced RA Mice

Rheumatoid arthritis (RA) is a complex chronic inflammatory autoimmune disease. The pathogenesis of the disease is related to invariant natural killer T (iNKT) cells. Patients with active RA present fewer iNKT cells, defective cell function, and excessive polarization of Th1. In this study, an RA animal model was established using a mixture of hGPI325-339 and hGPI469-483 peptides. The iNKT cells were obtained by in vivo induction and in vitro purification, followed by infusion into RA mice for adoptive immunotherapy. The in vivo imaging system (IVIS) tracking revealed that iNKT cells were mainly distributed in the spleen and liver. On day 12 after cell therapy, the disease progression slowed down significantly, the clinical symptoms were alleviated, the abundance of iNKT cells in the thymus increased, the proportion of iNKT1 in the thymus decreased, and the levels of TNF-&#945;, IFN-&#947;, and IL-6 in the serum decreased. Adoptive immunotherapy of iNKT cells restored the balance of immune cells and corrected the excessive inflammation of the body.

Adoptive Immunotherapy of iNKT Cells in Glucose-6-Phosphate Isomerase G6PI-Induced RA Mice

This protocol uses G6PI mixed peptides to construct rheumatoid arthritis models that are closer to that of human rheumatoid arthritis in CD4+ T cells and cytokines. High purity invariant natural killer T cells (mainly iNKT2) with specific phenotypes and functions were obtained by in vivo induction and in vitro purification for adoptive immunotherapy.

Inmunoterapia adoptiva de células iNKT en ratones RA inducidos por glucosa-6-fosfato (G6PI)

Rheumatoid arthritis (RA) is a complex chronic inflammatory autoimmune disease. The pathogenesis of the disease is related to invariant natural killer T ...