Este trabajo fue apoyado por becas de los Institutos Nacionales de Salud, Instituto Nacional de Ciencias Médicas Generales (R01GM063075) y el Centro Nacional de Medicina Complementaria y Alternativa (R01AT05076).

1. Establecimiento de modelo animal de sepsis <ol><li> Los ratones se anestesiaron con cetamina (75 mg / kg, por vía intramuscular, im) y xilazina (10 mg / kg, im), y se colocó en posición supina. </li><li> Fijar los pies del ratón con cinta adhesiva para asegurar una posición estable. </li><li> Limpie el abdomen con 3 matorrales alternas de betadine o desinfectante de la piel al otro y el alcohol. Luego, haga una incisión de 15 mm para exponer el ciego. </li><li> Ligar el ciego con una sutura de seda 4-0 aproximadamente 5,0 mm de la punta del ciego, y luego perforar el muñón del ciego ligado una vez con una aguja de calibre 22 para permitir la extrusión de las heces. </li><li> El ciego es inmediatamente sustituido de nuevo a su habitual posición de intra-abdominal. </li><li> Cerca del sitio de la incisión en dos capas, por primera cerrando la musculatura del abdomen con suturas absorbibles, y luego cerrar la piel con clips de heridas o suturas absorbibles. </li><li> Resucitar el ratón con 0,5 ml de solución salina normal y hacer una solaSE de imipenem (0,5 mg / ratón, por vía subcutánea) inmediatamente después de la finalización del procedimiento quirúrgico. </li><li> Vuelva a colocar el ratón de nuevo a una jaula limpia, con acceso libre a comida y agua. </li><li> En CLP puesto varios puntos de tiempo, extracto de hierbas o un componente se administra por vía intraperitoneal. </li><li> Supervivencia animal es supervisado por más de dos semanas. Los animales moribundos que presentan dificultades sean válidas, la respiración agónica, atrofia muscular severa y sangrado sin control deben ser sacrificados por inhalación de sobredosis de dióxido de carbono. </li><li> Es importante señalar que los niveles circulantes de citoquinas son parámetros importantes en estos estudios. Varios analgésicos se ha demostrado que afectan a la liberación de citoquinas y de las actividades, y por lo tanto, se han evitado intencionalmente en el postoperatorio. </li></ol> 2. Preparación del extracto de hierbas <ol><li> Extracto de hierbas en agua caliente (85 ° C) durante 1-4 horas (1 hora para las hojas, y 4 horas para las raíces). </li><li> Centrifugar el agua tanfracción luble (3300 g, 20 min, 4 ° C) para eliminar las partículas insolubles. </li><li> El filtrado de la fracción sobrenadante a través de un filtro de 0,2 micras. </li><li> La clara fracción soluble en agua filtrado se fracciona por ultrafiltración utilizando Centriprep YM-10 Filtro centrífugo (catálogo n. 4305, Millipore). </li><li> El resultado fracciones de bajo peso molecular (menos de 10 kDa) y alta (&gt; 10 kDa), peso (MWF) son examinados para detectar HMGB1 inhibidores de las actividades que utilizan cultivos de macrófagos. </li><li> La administración intraperitoneal de HMGB1 inhibidores de extracto de hierbas o componentes a las 24 horas después de la CLP para evaluar su eficacia terapéutica. </li></ol> 3. Aislamiento de macrófagos peritoneales <ol><li> Tioglicolato caldo (4%, 2,0 ml) se administra por vía intraperitoneal a ratones normales. </li><li> Primaria macrófagos peritoneales se cosechan a los 3 días como se describió previamente 10. </li><li> Los macrófagos son pre-cultivadas en medio DMEM (Gibco BRL, Grand Island, NY) suplementado con 10% de suero fetal bovino (FBS), glutamina 2 mmol / l, y 1% de penicilina. </li><li> Macrófagos adherentes se lavó suavemente con, y se cultivaron en, libre de suero OPTI-MEM medio que dos horas antes de la estimulación con endotoxina bacteriana (lipopolisacárido, LPS, E. coli 0111: B4, Sigma-Aldrich). </li><li> A las 16 horas después de la estimulación con LPS, los niveles de HMGB1 en el medio de cultivo se determinó por análisis de transferencia Western 11. </li><li> La intensidad de la banda se cuantificó en relación con la imagen del NIH 1.59 del software para determinar los niveles de HMGB1 en referencia a las curvas de calibración generadas con HMGB1 purificada. </li></ol> 4. Los resultados representativos 1. CLP induce la inflamación sistémica y local. A las pocas horas de la cirugía de CLP, los animales muestran signos clínicos de sepsis que incluyen piloerección, letargo, acurrucándose, y la disminución de la ingesta de alimentos y agua. Animales en vías de desarrollo una peritonitis severa con sistémica consecutivala infección normalmente mueren dentro de 48 a 96 h. Sin embargo, incluso con la edad, sexo, y de fondo genético emparejados animales pueden responder a CLP cirugía en una forma distinguible en el curso de la sepsis experimental. Por ejemplo, a las 48 horas después de la CLP, mientras que algunos animales pueden se han acercado al estado moribundo (tal como se define en la Figura 1), otros pueden permanecer en un estado no moribunda. Estudios exhaustivos de las citocinas circulantes reveló diferencias espectaculares en los niveles de varias citocinas (por ejemplo, IL-6, KC, MIP-2, y sTNFR1) entre los ratones en los estados moribundos y no moribundo-(Figura 1) 12. Cabe destacar que estos mediadores inflamatorios han sido clasificados como marcadores de sepsis debido a que sus niveles circulantes son indicadores fiables de los resultados experimentales letal en 12-14 o sepsis clínica 15. Además, el CLP también indujo la liberación local de diversas citoquinas pro-y anti-inflamatorias y quimiocinas. Por ejemplo, en48 horas después de la CLP, cantidades significativas de citoquinas (por ejemplo, IL-6) y quimiocinas (KC y MIP-2) todavía se puede medir no sólo sistémicamente en la sangre, sino también localmente en el líquido de lavado peritoneal (Figura 2). 2. La detección de inhibidores de la HMGB1 extracto de hierbas o componentes. Utilizando cultivos de macrófagos, hemos sido capaces de evaluar las capacidades de extracto de hierbas o varios componentes de la inhibición de la liberación inducida por endotoxina HMGB1 (Figura 3). A la luz de su capacidad de inhibir la liberación de HMGB1, seguir estudiando su eficacia en animales modelos de sepsis. Teniendo en cuenta la cinética de retraso y la acumulación prolongada de HMGB1 en la sepsis experimental 8, la primera dosis de inhibidores de la HMGB1 se le dio 24 horas después de la aparición de la sepsis - un punto de tiempo cuando los ratones desarrollaron signos claros de sepsis, incluyendo el letargo, diarrea y piloerección. Como se muestra en la Figura 4, el retraso y la administración repetida de una gran verde c témarco del componente, la epigalocatequina-3-galato (EGCG), comenzando a las 24 h después del inicio de la sepsis, rescatados de manera significativa a los ratones de sepsis letal 12. Incluso cuando se administra por vía oral, EGCG ratones todavía rescatados de sepsis letal, aumentando significativamente las tasas de supervivencia de los animales de 16% a 44% 16. Sería importante determinar si las terapias combinadas con varios componentes a base de hierbas puede lograr una protección significativamente mejor en los modelos animales de sepsis. En conjunto, estos datos experimentales validado nuestro enfoque de la pantalla de nuevos agentes terapéuticos utilizando un modelo animal de la CLP-inducida por la sepsis. 5. Los resultados representativos <img alt="Figura 1" src="/files/ftp_upload/3926/3926fig1.jpg" /> Figura 1. Los niveles circulantes de marcadores indirectos son mucho más altos en los animales sépticos que se acercan estado moribundo. Ratones Balb / C fueron sometidas a sepsis por el CLP y el seguimiento para el desarrollo de signos de enfermedad. En unaetapa tardía de la sepsis (52 horas después de la CLP), se recogió sangre de los ratones normales (3-CLP), 3 ratones sépticos que se acercan al estado moribundo, y 3 ratones sépticos en el estado no moribunda. El suero se combinaron de cada grupo, y se analizaron para el perfil de citocinas por los arrays de anticuerpos. Tenga en cuenta la dramática diferencia en los niveles relativos de varios marcadores entre diferentes grupos. Adaptado de doi: 10.1371/journal.pone.0001153.g006 con el permiso otorgado a la editorial. <img alt="Figura 2" src="/files/ftp_upload/3926/3926fig2.jpg" /> Figura 2. Detección de citocinas locales y sistémicas y quimiocinas a las 48 horas después de la CLP. Ratones Balb / C fueron sometidas a sepsis por el CLP, y el líquido peritoneal de sangre o se cosecharon a las 48 horas después de la CLP. Los niveles relativos de varias citocinas y quimiocinas en el líquido de lavado combinado de suero o peritoneal se midieron por los arrays de anticuerpos de citoquinas, y se expresan como unidades arbitrarias (UA). Como controles fluido, sangre y peritoneal SAmples se obtuvieron a partir de animales sanos (normales-CLP), sin laparotomía. <img alt="Figura 3" src="/files/ftp_upload/3926/3926fig3.jpg" /> Figura 3. Componente de base de plantas dependiendo de la dosis inhibe inducida por endotoxina HMGB1 liberación en cultivos de macrófagos primarios. Los macrófagos peritoneales murinos primarios fueron estimuladas con LPS en la ausencia o la presencia de componentes a base de plantas (por ejemplo, EGCG, 15 M). A las 16 horas después de la estimulación con LPS, los niveles de HMGB1 en el medio de cultivo se determinaron por análisis de Western Blot. Adaptado de doi: 10.1371/journal.pone.0001153.g006 con el permiso otorgado a la editorial. <img alt="Figura 4" src="/files/ftp_upload/3926/3926fig4.jpg" /> Figura 4. Componente a base de hierbas rescatado a los ratones de la sepsis letal. Ratones Balb / C fueron sometidas a sepsis letal por el CLP, y el componente a base de hierbas (EGCG) fue administrado por vía intraperitoneal a 24, +48, +72 horas después de la aparición de la sepsis. Unla supervivencia proximal fue monitoreada durante un máximo de dos semanas. El método de Kaplan-Meier se utilizó para comparar las diferencias en las tasas de mortalidad entre los grupos. *, P &lt;0,05 en comparación con solución salina. Adaptado de doi: 10.1371/journal.pone.0001153.g006 con el permiso otorgado a la editorial.

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AES y HW son co-inventores de las solicitudes de patentes relacionadas con HMGB1 inhibidores de la tanshinones) como potenciales agentes terapéuticos para la sepsis.

En el laboratorio, varios modelos animales de sepsis se han empleado para entender la patogénesis de la sepsis con el fin de desarrollar terapias potenciales novedosas. Su relevancia clínica sigue siendo un tema de debate antes de la traducción exitosa de los estudios en animales a las aplicaciones clínicas de la sepsis. Aunque los anticuerpos neutralizantes contra citoquinas tempranas (por ejemplo, TNF) tenían un efecto protector en modelos animales de bacteriemia / endotoxemia 17,18, en realidad empeor...

<table border="1"><tbody><tr><td> Nombre del reactivo </td><td> Empresa </td><td> Número de catálogo </td></tr><tr><td> Betadine </td><td> Purdue Products LP </td><td> 25655-41-8 </td></tr><tr><td> imipenem </td><td> Merck &amp; Co., Inc. </td><td> 9882821 </td></tr><tr><td> La ketamina HCl </td><td> Hospira Inc. </td><td> RL-0065 </td></tr><tr><td> Xilacina </td><td> Lloyd Laboratorios </td><td> 4821 </td></tr><tr><td> Autoclip </td><td> Becton Dickinson </td><td> 427631 </td></tr><tr><td> Sutura de seda 4-0 </td><td> Roboz </td><td> SUT-15-2 </td></tr><tr><td> Surflo IV Catéter </td><td> Terumo </td><td> SR * OX2419CA </td></tr><tr><td> Del ratón RayBio citoquinas anticuerpos matriz </td><td> RayBiotech, Inc. </td><td> AAM-CYT-3 </td></tr><tr><td> Tioglicolato </td><td> Becton Dickinson </td><td> 211716 </td></tr></tbody></table>

use of animal model of sepsis to evaluate novel herbal therapies

La sepsis se refiere a un síndrome de respuesta inflamatoria sistémica que resulta de una infección microbiana. Ha sido rutinariamente simulada en animales mediante varias técnicas, incluyendo la infusión de la toxina bacteriana exógena (endotoxemia) o bacterias (bacteriemia), así como la perforación quirúrgica del ciego por ligadura cecal y punción (CLP) 1-3. CLP permite derrame bacterias y la contaminación fecal de la cavidad peritoneal, imitando la enfermedad humana clínico de apendicitis perforada o la diverticulitis. La severidad de la sepsis, como se refleja en las tasas de mortalidad eventuales, se puede controlar quirúrgicamente variando el tamaño de la aguja utilizada para la punción cecal 2. En los animales, induce CLP hemodinámico, bifásica respuestas cardiovasculares, metabólicas e inmunológicas como se observó durante el curso clínico de la sepsis humana 3. Así, el modelo CLP es considerado como uno de los modelos más clínicamente relevantes para la sepsis experimental 1-3. &lt;/ P&gt; Varios modelos animales han sido utilizados para aclarar los mecanismos que subyacen intrincados la patogénesis de la sepsis experimental. La consecuencia letal de la sepsis es atribuible en parte a una acumulación excesiva de citoquinas tempranas (como el TNF, IL-1 e IFN-γ) 4-6 y mediadores proinflamatorios finales (por ejemplo, HMGB1) 7. En comparación con las primeras citocinas proinflamatorias, a finales de los mediadores de acción tienen una ventana terapéutica amplia para aplicaciones clínicas. Por ejemplo, la administración retardada de HMGB1 anticuerpos neutralizantes comenzando 24 horas después de CLP, siendo rescatado ratones de letalidad 8,9, estableciendo HMGB1 como un mediador tardío de la sepsis letal. El descubrimiento de HMGB1 como mediador a fines de acción ha puesto en marcha un nuevo campo de investigación para el desarrollo de terapias que utilizan la sepsis Medicina Herbal Tradicional China. En este trabajo se describe un procedimiento de la CLP-inducida por la sepsis, y su uso en el cribado de la medicina herbaria para HMGB1 de metas de terapias.

Watch this Scientific Journal Video about Use of Animal Model of Sepsis to Evaluate Novel Herbal Therapies at JoVE.com

Use of Animal Model of Sepsis to Evaluate Novel Herbal Therapies

La sepsis se refiere a un síndrome de respuesta inflamatoria sistémica resultante de una infección microbiana, y puede ser simulado por una técnica quirúrgica denomina ligadura cecal y punción (CLP). Aquí se describe un método para utilizar CLP inducida modelo animal para cribar hierbas medicinales para agentes terapéuticos.

El uso de modelos animales de sepsis para evaluar nuevas terapias a base de plantas

Sepsis refers to a systemic inflammatory response syndrome resulting from a microbial infection. It has been routinely simulated in animals by several ...

use-of-animal-model-of-sepsis-to-evaluate-novel-herbal-therapies

Research

JoVE Journal

Medicine

19.3K vistas.  North Shore – LIJ Health System. La sepsis se refiere a un síndrome de respuesta inflamatoria sistémica resultante de una infección microbiana, y puede ser simulado por una técnica quirúrgica denomina ligadura cecal y punción (CLP). Aquí se describe un método para utilizar CLP inducida modelo animal para cribar hierbas medicinales para agentes terapéuticos.

Video: Use of Animal Model of Sepsis to Evaluate Novel Herbal Therapies

The CYP2D6 Animal Model: How to Induce Autoimmune Hepatitis in Mice

Autoimmune hepatitis is a rare but life threatening autoimmune disease of the liver of unknown etiology1,2. In the past many attempts have been made to generate an animal model that reflects the characteristics of the human disease 3-5. However, in various models the induction of disease was rather complex and often hepatitis was only transient3-5. Therefore, we have developed a straightforward mouse model that uses the major human autoantigen in type 2 autoimmune hepatitis (AIH-2), namely hCYP2D6, as a trigger6. Type 1 liver-kidney microsomal antibodies (LKM-1) antibodies recognizing hCYP2D6 are the hallmark of AIH-27,8. Delivery of hCYP2D6 into wildtype FVB or C57BL/6 mice was by an Adenovirus construct (Ad-2D6) that ensures a direct delivery of the triggering antigen to the liver. Thus, the ensuing local inflammation generates a fertile field9 for the subsequent development of autoimmunity. A combination of intravenous and intraperitoneal injection of Ad-2D6 is the most effective route to induce a long-lasting autoimmune damage to the liver (section 1). Here we provide a detailed protocol on how autoimmune liver disease is induced in the CYP2D6 model and how the different aspects of liver damage can be assessed. First, the serum levels of markers indicating hepatocyte destruction, such as aminotransferases, as well as the titers of hCYP2D6 antibodies are determined by sampling blood retroorbitaly (section 2). Second, the hCYP2D6-specific T cell response is characterized by collecting lymphocytes from the spleen and the liver. In order to obtain pure liver lymphocytes, the livers are perfused by PBS via the portal vein (section 3), digested in collagen and purified over a Percoll gradient (section 4). The frequency of hCYP2D6-specific T cells is analyzed by stimulation with hCYP2D6 peptides and identification of IFN&gamma;-producing cells by flow cytometry (section 5). Third, cellular infiltration and fibrosis is determined by immunohistochemistry of liver sections (section 6). Such analysis regimen has to be conducted at several times after initiation of the disease in order to prove the chronic nature of the model. The magnitude of the immune response characterized by the frequency and activity of hCYP2D6-specific T and/or B cells and the degree of the liver damage and fibrosis have to be assessed for a subsequent evaluation of possible treatments to prevent, delay or abrogate the autodestructive process of the liver.

Infection of mice with an Adenovirus expressing the major human autoantigen cytochrome P450 2D6 (hCYP2D6) recognized by sera of patients suffering from type 2 autoimmune hepatitis results in a persistent form of autoimmune-mediated liver disease characterized by extensive hepatitis, fibrosis and generation of a CYP2D6-specific immune response.

El CYP2D6 Animal Modelo: cómo inducir a la hepatitis autoinmune en ratones

Autoimmune hepatitis is a rare but life threatening autoimmune disease of the liver of unknown etiology1,2. In the past many attempts have been made to ...

Investigación

Medicina

A Mouse Tumor Model of Surgical Stress to Explore the Mechanisms of Postoperative Immunosuppression and Evaluate Novel Perioperative Immunotherapies

Surgical resection is an essential treatment for most cancer patients, but surgery induces dysfunction in the immune system and this has been linked to the development of metastatic disease in animal models and in cancer patients. Preclinical work from our group and others has demonstrated a profound suppression of innate immune function, specifically NK cells in the postoperative period and this plays a major role in the enhanced development of metastases following surgery. Relatively few animal studies and clinical trials have focused on characterizing and reversing the detrimental effects of cancer surgery. Using a rigorous animal model of spontaneously metastasizing tumors and surgical stress, the enhancement of cancer surgery on the development of lung metastases was demonstrated. In this model, 4T1 breast cancer cells are implanted in the mouse mammary fat pad. At day 14 post tumor implantation, a complete resection of the primary mammary tumor is performed in all animals. A subset of animals receives additional surgical stress in the form of an abdominal nephrectomy. At day 28, lung tumor nodules are quantified. When immunotherapy was given immediately preoperatively, a profound activation of immune cells which prevented the development of metastases following surgery was detected. While the 4T1 breast tumor surgery model allows for the simulation of the effects of abdominal surgical stress on tumor metastases, its applicability to other tumor types needs to be tested. The current challenge is to identify safe and promising immunotherapies in preclinical mouse models and to translate them into viable perioperative therapies to be given to cancer surgery patients to prevent the recurrence of metastatic disease.

A mouse tumor model of surgical stress is used to explore how postoperative immune suppression promotes metastatic disease and to evaluate immunostimulatory perioperative therapies.

Un modelo de tumor de Estrés quirúrgico para explorar los mecanismos de inmunosupresión postoperatoria y Evaluar Novel perioperatorias Inmunoterapias Ratón

Surgical resection is an essential treatment for most cancer patients, but surgery induces dysfunction in the immune system and this has been linked to ...

Bioluminescence Imaging of an Immunocompetent Animal Model for Glioblastoma

In contrast to commonly reported human glioma xenograft animal models, GL261 murine glioma xenografts recapitulate nearly all relevant clinical and histopathologic features of the human disease. When GL261 cells are implanted intracranially in syngeneic C57BL/6 mice, the model has the added advantage of maintaining an intact immune microenvironment. Stable expression of luciferase in GL261 cells allows non-invasive cost effective bioluminescence monitoring of intracranial tumor growth. We have recently demonstrated that luciferase expression in GL261 cells does not affect the tumor growth properties, tumor cell immunomodulatory cytokine expression, infiltration of immune cells into the tumor, or overall survival of animals bearing the intracranial tumor. Therefore, it appears that the GL261 luciferase glioma model can be useful in the study of novel chemotherapeutic and immunotherapeutic modalities. Here we report the technique for generating stable luciferase expression in GL261 cells and how to study the in vitro and in vivo growth of the tumor cells by bioluminescence imaging.

GL261 glioma cells provide a useful immunocompetent animal model of glioblastoma. The goals of this protocol are to demonstrate proper techniques for monitoring intracranial tumor growth using in vivo bioluminescence imaging, and to verify the utility of luciferase-modified GL261 cells for studying tumor immunology and immunotherapeutic approaches for treating glioblastoma.

La bioluminiscencia de imágenes de un Modelo inmunocompetentes Animal para Glioblastoma

In contrast to commonly reported human glioma xenograft animal models, GL261 murine glioma xenografts recapitulate nearly all relevant clinical and ...

A Small Animal Model of Ex Vivo Normothermic Liver Perfusion

There is a significant shortage of liver allografts available for transplantation, and in response the donor criteria have been expanded. As a result, normothermic ex vivo liver perfusion (NEVLP) has been introduced as a method to evaluate and modify organ function. NEVLP has many advantages in comparison to hypothermic and subnormothermic perfusion including reduced preservation injury, restoration of normal organ function under physiologic conditions, assessment of organ performance, and as a platform for organ repair, remodeling, and modification. Both murine and porcine NEVLP models have been described. We demonstrate a rat model of NEVLP and use this model to show one of its important applications &#8212; the use of a therapeutic molecule added to liver perfusate. Catalase is an endogenous reactive oxygen species (ROS) scavenger and has been demonstrated to decrease ischemia-reperfusion in the eye, brain, and lung. Pegylation has been shown to target catalase to the endothelium. Here, we added pegylated-catalase (PEG-CAT) to the base perfusate and demonstrated its ability to mitigate liver preservation injury. An advantage of our rodent NEVLP model is that it is inexpensive in comparison to larger animal models. A limitation of this study is that it does not currently include post-perfusion liver transplantation. Therefore, prediction of the function of the organ post-transplantation cannot be made with certainty. However, the rat liver transplant model is well established and certainly could be used in conjunction with this model. In conclusion, we have demonstrated an inexpensive, simple, easily replicable NEVLP model using rats. Applications of this model can include testing novel perfusates and perfusate additives, testing software designed for organ evaluation, and experiments designed to repair organs.

A Small Animal Model of Ex Vivo Normothermic Liver Perfusion

There is a significant liver donor shortage, and criteria for liver donors have been expanded. Normothermic ex vivo liver perfusion (NEVLP) has been developed to evaluate and modify organ function. This study demonstrates a rat model of NEVLP and tests the ability of pegylated-catalase, to mitigate liver preservation injury.

Un pequeño modelo de la perfusión hepática normotérmica Ex Vivo

There is a significant shortage of liver allografts available for transplantation, and in response the donor criteria have been expanded. As a result, ...

Isometric Contractility Measurement of the Mouse Mesenteric Artery Using Wire Myography

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

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

Medición de la contractilidad isométrica de la arteria mesentérica de ratón con cable miografía

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

Novel Methods for Intranasal Administration Under Inhalation Anesthesia to Evaluate Nose-to-Brain Drug Delivery

Intranasal administration has been reported to be a potential pathway for nose-to-brain delivery of therapeutic agents that circumvents the blood-brain barrier. However, there have been few reports regarding not only the quantitative analysis but also optimal administration conditions and dosing regimens for investigations of nose-to-brain delivery. The limited progress in research on nose-to-brain pathway mechanisms using rodents represents a significant impediment in terms of designing nose-to-brain delivery systems for candidate drugs.
To gain some headway in this regard, we developed and evaluated two novel methods of stable intranasal administration under inhalation anesthesia for experimental animals. We also describe a method for the evaluation of drug distribution levels in the brain via the nose-to-brain pathway using radio-labeled [14C]-inulin (molecular weight: 5,000) as a model substrate of water-soluble macromolecules.
Initially, we developed a pipette-based intranasal administration protocol using temporarily openable masks, which enabled us to perform reliable administration to animals under stable anesthesia. Using this system, [14C]-inulin could be delivered to the brain with little experimental error.
We subsequently developed an intranasal administration protocol entailing reverse cannulation from the airway side through the esophagus, which was developed to minimize the effects of mucociliary clearance (MC). This technique led to significantly higher levels of [14C]-inulin, which was quantitatively detected in the olfactory bulb, cerebrum, and medulla oblongata, than the pipette method. This appears to be because retention of the drug solution in the nasal cavity was substantially increased by active administration using a syringe pump in a direction opposite to the MC into the nasal cavity.
In conclusion, the two methods of intranasal administration developed in this study can be expected to be extremely useful techniques for evaluating pharmacokinetics in rodents. The reverse cannulation method, in particular, could be useful for evaluating the full potential of nose-to-brain delivery of drug candidates.

Here, we describe two novel methods of stable intranasal administration under inhalation anesthesia with minimal physical stress for experimental animals. We also describe a method for quantitative evaluation of drug distribution levels in the brain via the nose-to-brain pathway using radiolabeled [14C]-inulin as a model substrate of water-soluble macromolecules.

Nuevos métodos para la administración Intranasal bajo inhalación de anestesia para evaluar el suministro de medicamentos de la nariz al cerebro

Intranasal administration has been reported to be a potential pathway for nose-to-brain delivery of therapeutic agents that circumvents the blood-brain ...

Functional Assessment of the Donor Heart During Ex Situ Perfusion: Insights from Pressure-Volume Loops and Surface Echocardiography

Heart transplantation remains the gold standard treatment for advanced heart failure. However, the current critical organ shortage has resulted in the allocation of a growing number of donor hearts with extended criteria. These marginal grafts are associated with a high risk of primary graft failure and may benefit from ex situ perfusion before transplant. This technology allows for extended organ preservation using warm oxygenated blood perfusion with continuous metabolic monitoring. The only NESP device currently available for clinical practice perfuses the organ in an unloaded non-working state, which does not allow for functional assessment of the beating heart. We therefore developed an original platform of NESP in working mode conditions with adjustment of left ventricular preload and afterload. This protocol was applied in porcine hearts. Ex situ functional assessment of the heart was achieved with intracardiac conductance catheterization and surface echocardiography. Along with a description of the experimental protocol, we herein report the main results, as well as pearls and pitfalls associated with the acquisition of pressure-volume loops and myocardial power during NESP. Correlations between hemodynamic findings and ultrasound variables are of major interest, especially for further rehabilitation of donor hearts before transplantation. This protocol aims to improve the assessment of donor hearts to both increase the donor pool and reduce the incidence of primary graft failure.

Functional Assessment of the Donor Heart During Ex Situ Perfusion: Insights from Pressure-Volume Loops and Surface Echocardiography

A reliable noninvasive approach for functional assessment of the donor heart during normothermic ex situ heart perfusion (NESP) is lacking. We herein describe a protocol for ex situ assessment of myocardial performance using the epicardial echocardiography and conductance catheter method.

Evaluación funcional del corazón donante durante la perfusión ex situ : perspectivas de los bucles de presión-volumen y la ecocardiografía de superficie

Heart transplantation remains the gold standard treatment for advanced heart failure. However, the current critical organ shortage has resulted in the ...

Partial Sciatic Nerve Ligation: A Mouse Model of Chronic Neuropathic Pain to Study the Antinociceptive Effect of Novel Therapies

Management of chronic pain remains challenging to this day, and current treatments are associated with adverse effects, including tolerance and addiction. Chronic neuropathic pain results from lesions or diseases in the somatosensory system. To investigate potential therapies with reduced side effects, animal pain models are the gold standard in preclinical studies. Therefore, well-characterized and well-described models are crucial for the development and validation of innovative therapies. 
Partial ligation of the sciatic nerve (pSNL) is a procedure that induces chronic neuropathic pain in mice, characterized by mechanical and thermal hypersensitivity, ongoing pain, and changes in limb temperature, making this model a great fit to study neuropathic pain preclinically. pSNL is an advantageous model to study neuropathic pain as it reproduces many symptoms observed in humans with neuropathic pain. Furthermore, the surgical procedure is relatively fast and straightforward to perform. Unilateral pSNL of one limb allows for comparison between the ipsilateral and contralateral paws, as well as evaluation of central sensitization. 
To induce chronic neuropathic hypersensitivity, a 9-0 non-absorbable nylon thread is used to ligate the dorsal third of the sciatic nerve. This article describes the surgical procedure and characterizes the development of chronic neuropathic pain through multiple commonly used behavioral tests. As a plethora of innovative therapies are now being investigated to treat chronic pain, this article provides crucial concepts for standardization and an accurate description of surgeries required to induce neuropathic pain.

Partial sciatic nerve ligation induces long-lasting chronic neuropathic pain, characterized by exaggerated responses to thermal and mechanical stimuli. This mouse model of neuropathic pain is commonly used to study innovative therapies for pain management. This article describes in detail the surgical procedure to improve standardization and reproducibility.

Ligadura parcial del nervio ciático: un modelo de ratón de dolor neuropático crónico para estudiar el efecto antinociceptivo de nuevas terapias

Management of chronic pain remains challenging to this day, and current treatments are associated with adverse effects, including tolerance and addiction. ...

Mongolian Gerbils as an Animal Model of Wound Healing

Corneal wound healing studies have been conducted for a long time and have helped to reduce suffering and develop treatments that contribute to improving patients' eye health. Historically, corneal healing has been studied in rodents such as mice and rats, but these models might not completely mimic human disorders. However, information on other rodents such as Mongolian gerbils (Meriones unguiculatus) is scant in corneal research.
Here, we describe a technique to develop a novel animal model for studying corneal healing after photorefractive keratectomy. Due to the limited literature available on the cornea of M. unguiculatus, we also describe a histological analysis of the normal cornea. These research techniques can also be employed in the study of eye diseases because of the similarity between the corneas of Mongolian gerbils and humans in terms of genetics, anatomy, and physiology.

This article describes a new animal model developed to study the anatomy and histology of the cornea and its healing processes. This new animal model uses the Mongolian gerbil, which has a cornea with many similarities to the human cornea.

Los jerbos mongoles como modelo animal de curación de heridas

Corneal wound healing studies have been conducted for a long time and have helped to reduce suffering and develop treatments that contribute to improving ...

Catéter Hickman para acceso vascular a largo plazo en cerdos

Hickman Catheter Use for Long-Term Vascular Access in a Preclinical Swine Model

Central venous catheters (CVCs) are invaluable devices in large animal research as they facilitate a wide range of medical applications, including blood monitoring and reliable intravenous fluid and drug administration. Specifically, the tunneled multi-lumen Hickman catheter (HC) is commonly used in swine models due to its lower extrication and complication rates. Despite fewer complications relative to other CVCs, HC-related morbidity presents a significant challenge, as it can significantly delay or otherwise negatively impact ongoing studies. The proper insertion and maintenance of HCs is paramount in preventing these complications, but there is no consensus on best practices. The purpose of this protocol is to comprehensively describe an approach for the insertion and maintenance of a tunneled HC in swine that mitigates HC-related complications and morbidity. The use of these techniques in &gt;100 swine has resulted in complication-free patent lines up to 8 months and no catheter-related mortality or infection of the ventral surgical site. This protocol offers a method to optimize the lifespan of the HC and guidance for approaching issues during use.

Autor destacado: Uso del catéter Hickman para el acceso vascular a largo plazo en un modelo porcino preclínico  

A reliable and reproducible approach for the insertion and maintenance of a tunneled Hickman catheter for long-term vascular access in swine is described. Placement of a central venous catheter allows for convenient daily sampling of whole blood from awake animals and intravenous administration of medication and fluids.

Uso del catéter Hickman para el acceso vascular a largo plazo en un modelo porcino preclínico

Central venous catheters (CVCs) are invaluable devices in large animal research as they facilitate a wide range of medical applications, including blood ...