Breanne Cuddington holds a fellowship from the Canadian Breast Cancer Foundation. This work was sponsored by operating grants from the Cancer Research Society and the Canadian Cancer Society Research Institute (formerly the Canadian Breast Cancer Research Alliance). We thank Ann Tollefson (Saint Louis University School of Medicine) for LCRT cells and Dr. Kathleen Delaney and Marion Corrick for technical assistance with cotton rat housing and sedation.

<ol>
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The authors acknowledge there are no financial conflicts of interest related to this research.

Cotton rats are highly excitable and have a strong flight response. Therefore, special care should be taken to minimize any undue stress on the animal. The cage setup described will allow for safe and easy capture of the animals, with the placement of the enrichment tube being of the utmost importance. When setting up cages, ensure that the enrichment tubes meet the size and shape requirements, and are placed in proper orientation in the cage. It is also important to ensure that any technicians who might be aiding in ani...

الفيروسات حال الورم (OV) تكرار انتقائي في الخلايا السرطانية من خلال استغلال الاختلافات البيوكيميائية بين الخلايا الطبيعية والسرطانية 1،2. هناك نوعان من OVS: تلك التي لا تحتاج إلى طفرة لتحقيق انحلال الورم انتقائية، ويشار إلى الفيروسات التي تحدث بشكل طبيعي من النوع البري وتلك التي يجب أن هندستها لتحقيق انحلال الورم انتقائي. جمع الطفرات ضمن نوع الورم نظرا يحدد طبيعة ميزة النمو انتقائية على الخلايا الطبيعية لOV 2. وقد تجلى سلامة والاستفادة من استخدام OVS في التجارب السريرية 3-7. وعلى الرغم من التقدم في مجال علاج بالفيروسات حال الورم توجد الفجوات بين النتائج ما قبل السريرية والسريرية، مما يوحي بأن هناك حاجة إلى نماذج أفضل لتقييم فعالية مضادة للورم من OVS. البقري نوع هربس 1 (BHV-1) هو عضو في عائلة فيروسات هربسية، وAlphaherpesviridae فصيلة. BHV-1 initiآتش البقري مجمع أمراض الجهاز التنفسي في الماشية، ويظهر في مجموعة متنوعة واسعة من أعراض تشبه نزلة برد 8،9. BHV-1 يربط مرفق ودخول مستقبلات يستخدمها HSV-1، مثل كبريتات heparan وnectin-1 10. ومع ذلك، فإنه يربط CD155 في مكان nectin-2 10. BHV-1 لديها مجموعة والمضيف ضيق جدا بحيث أنه غير قادر على الدخول بكفاءة وبدء النسخ المتماثل في الخلايا الطبيعية وتحويلها الفئران 3،4،10. وهذا يجعل من استخدام نماذج الفئران التقليدية إشكالية. وقد تجلى القدرة حال الورم من BHV-1 في المختبر 11،12. وقد تبين BHV-1 لبدء النسخ المتماثل في وقتل الخلايا السرطانية البشرية من مجموعة متنوعة من أصول النسيجية، بما في ذلك خلايا سرطان الثدي وسرطان الثدي الشروع في الخلايا 11،12. ومع ذلك، يجب تقييم القدرة انتيتومور من BHV-1 في الجسم الحي في سياق مضيف مناعيا. اتش الإنسان (الإعلان)، والتيهناك 57 الأنماط المصلية التي تم تحديدها، تتسبب الأكثر شيوعا أمراض الجهاز التنفسي لدى البشر. تم تقييم ناقلات الإعلان حال الورم لفعالية مضادة للورم مع العديد التقدم في التجارب السريرية 13-15. وعلى الرغم من بيانات ما قبل السريرية واعدة، وتراجعت النتائج السريرية قصيرة من التوقعات. وعادة ما يتم استخدام نماذج طعم أجنبي الورم البشري لدراسة فعالية مضادة للورم من ناقلات الإعلان، على الرغم من أنها تظهر الموهن الاستجابات المناعية للفيروس 16،17. وعلاوة على ذلك، ونماذج الفئران مسانج غير قابلة للمتساهلة للإصابة الإعلان، مما يجعل تقييم المضيف الاستجابات المناعية باستخدام هذه النماذج غير عملي 17،18. تم التعرف على الجهاز المناعي المضيف كآلية الأكثر تأثيرا التي OVS يثير ورم الخلايا الموت 19. ردود انتيتومور بين tolerized وغير tolerized مستضد المرتبطة الورم (TAA) نماذج تختلف ويمكن أن تؤثر بشكل كبير على نجاح العلاج OV. وHSV-1 OV KM100 (ICP0 n212VP16 في عام 1814 20) 20،21 أثار الورم الانحدار في 80٪ من الفئران الحاملة للورم في الفئران التورام الأوسط T مستضد نموذج سرطان الثدي 22. ومع ذلك، في HER-2 نماذج / NEU، وفعالية مضادة للورم من KM100 تنوعت بين الانحدار الكامل 20٪ في الفئران مسانج وورم في ركود المعدلة وراثيا والفئران HER2 tolerized. معا هذه البيانات تبرز أهمية تقييم كامل OVS باستخدام نماذج حيوانية أن ألخص أفضل المشهد المناعة البشري أن نفهم تماما ما هي الميزات تحديد النجاح العلاجي. يتم استخدام الفئران القطن (Sigmodon hispidus)، السكان الأصليين لأمريكا الشمالية والجنوبية، والأكثر شيوعا كنموذج للعدوى فيروس الجهاز التنفسي المخلوي (كما استعرض في 5). وتستخدم الفئران القطن أيضا في مجال البحوث لمكافحة BHV-1 التطعيم لأنها تلخيص علم الأمراض المرتبطة بأمراض الجهاز التنفسي البقري معقدة 6،23. وعلاوة على ذلك، BHV-1 إصابة الفئران القطنيولد مناعة، الأمر الذي أدى المخاطية المستدام والاستجابات المناعية الجهازية 6،23-25. وقد استمدت خطوط الخلايا من يفية عفوية وosteosarcomas من الغدة الثديية (LCRT) والعظام (CCRT وVCRT)، على التوالي 26. وقد استخدمت الفئران القطن لتقييم فعالية في الجسم الحي من ناقلات الإعلان حال الورم كما هي عرضة للإصابة الإعلان ويحمل علم أمراض مماثلة على البشر 27-29. استخدام نماذج المناعة لتقييم ما قبل السريرية من OVS ليسوا سوى أقل يدل على الردود السريرية للعلاج لكنها لا تأخذ في الاعتبار دور الجهاز المناعي في علاج بالفيروسات حال الورم 30،31. ولذلك، فإن مسانج ونماذج الفئران القطن tolerized ورم سرطان الثدي وعظمية والنماذج ذات الصلة التي لتقييم فعالية ما قبل السريرية من OVS، مثل BHV-1 والإعلان التي لا يمكن دراستها باستخدام نماذج الفئران التقليدية.

<table border="0" cellpadding="0" cellspacing="0">
	<tbody>
		<tr>
			<td>Name of Material/Equipment</td>
			<td>Company</td>
			<td>Catalog #</td>
			<td>Comments/Description</td>
		</tr>
		<tr>
			<td>Dulbecco&#8217;s modified Eagle&#8217;s medium&#160;</td>
			<td>Gibco</td>
			<td>11965-092</td>
			<td>May use any brand&#160;</td>
		</tr>
		<tr>
			<td>1X Phosphate Buffered Saline&#160;</td>
			<td></td>
			<td></td>
			<td>Can prepare in lab, filter to sterilize</td>
		</tr>
		<tr>
			<td>200 mM L-glutamine</td>
			<td>Gibco</td>
			<td>25030164</td>
			<td>May use any brand</td>
		</tr>
		<tr>
			<td>100x Antibiotic-Antimycotic&#160;</td>
			<td>Gibco</td>
			<td>15240-062</td>
			<td>May use any brand</td>
		</tr>
		<tr>
			<td>Fetal bovine serum</td>
			<td>Quality Biological Inc.</td>
			<td>110-001-101HI</td>
			<td>May use any brand</td>
		</tr>
		<tr>
			<td>T-150cm2 tissue culture flask</td>
			<td>Fisher Scientific</td>
			<td>14-826-80</td>
			<td>May use any brand</td>
		</tr>
		<tr>
			<td>1X TypLE Express</td>
			<td>Life Technologies</td>
			<td>12604-013</td>
			<td></td>
		</tr>
		<tr>
			<td>12-well cell culture plate, flat bottom</td>
			<td>Fisher Scientific</td>
			<td>08-772-29</td>
			<td>May use any brand, must be tissue culture treated</td>
		</tr>
		<tr>
			<td>alamarBlue</td>
			<td>Life Technologies</td>
			<td>DAL1025</td>
			<td>May use an alternative reagent for determination of cell viability</td>
		</tr>
		<tr>
			<td>8640 Teklad 22/5 Rodent diet</td>
			<td>Harlan&#160;</td>
			<td>8640</td>
			<td></td>
		</tr>
		<tr>
			<td>1/8&#8221; corncob rodent bedding</td>
			<td>Harlan</td>
			<td>7092</td>
			<td></td>
		</tr>
		<tr>
			<td>Nestlets</td>
			<td>Ancare</td>
			<td>-</td>
			<td>Made of pulped virgin cotton fiber, dust-free and autoclavable</td>
		</tr>
		<tr>
			<td>50 mL Conical tubes</td>
			<td>Fisher Scientific</td>
			<td>14-432-22</td>
			<td>May use any brand, must be sterile</td>
		</tr>
		<tr>
			<td>Isoflurane USP, 99.9 %, inhalation anesthetic</td>
			<td>Pharmaceutical Partners of Canada Inc.</td>
			<td>M60302</td>
			<td></td>
		</tr>
		<tr>
			<td>70% Ethanol</td>
			<td></td>
			<td></td>
			<td>Can prepare in lab</td>
		</tr>
		<tr>
			<td>10 % Neutral Buffered Formalin</td>
			<td>Sigma-Aldrich</td>
			<td>HT501128</td>
			<td>May use any brand</td>
		</tr>
		<tr>
			<td>Name of Material/Equipment</td>
			<td>Company</td>
			<td>Catalog #</td>
			<td>Comments/Description</td>
		</tr>
		<tr>
			<td>NAPCO NapFlow 1200 Class II A/B3 Biosafety Microbiological Safety Cabinet (cell culture hood)</td>
			<td>NAPCO</td>
			<td>Model used not currently available</td>
			<td>May use any brand</td>
		</tr>
		<tr>
			<td>Thermo Fisher Scientific Precision Heated Water Bath</td>
			<td>Fisher Scientific</td>
			<td>Model used not currently available&#160;</td>
			<td>May use any brand</td>
		</tr>
		<tr>
			<td>Reichert Bright-line Hemacytometer</td>
			<td>Sigma-Aldrich</td>
			<td>Z359629</td>
			<td>May use any brand</td>
		</tr>
		<tr>
			<td>Typhoon Trio BioAnalyzer&#160;</td>
			<td>GE Healthcare Life Sciences</td>
			<td>Model used not currently available&#160;</td>
			<td>May use any fluorescence plate reader</td>
		</tr>
		<tr>
			<td>Tecan Safire2 Multi-detection Microplate Reader</td>
			<td>Tecan</td>
			<td>Model used not currently available&#160;</td>
			<td>May use any fluorescence plate reader</td>
		</tr>
		<tr>
			<td>Allegra 6R benchtop centrifuge</td>
			<td>Beckman Coulter</td>
			<td>366816</td>
			<td>May use any brand</td>
		</tr>
		<tr>
			<td>Table Top Anaesthesia machine</td>
			<td>VetEquip</td>
			<td>Model used not currently available&#160;</td>
			<td>May use any brand, must be portable</td>
		</tr>
		<tr>
			<td>Wahl Peanut Mini Clippers</td>
			<td>Wahl</td>
			<td></td>
			<td>May use any brand of small clippers</td>
		</tr>
		<tr>
			<td>Insulin syringes 29 G x 1/2&#39;, 0.3 mL</td>
			<td>BD</td>
			<td>329464</td>
			<td>May use any brand. Insulin syringes are recommended as they make injections easier through the rat&#8217;s tough skin.&#160;</td>
		</tr>
		<tr>
			<td>Cotton swabs</td>
			<td>MedPro</td>
			<td>018-425</td>
			<td>May use any brand</td>
		</tr>
		<tr>
			<td>Sharp-Pointed Dissecting Scissors</td>
			<td>Fisher Scientific</td>
			<td>8940</td>
			<td>May use any brand</td>
		</tr>
		<tr>
			<td>Dissecting Tissue Forceps</td>
			<td>Fisher Scientific</td>
			<td>13-812-41</td>
			<td>May use any brand</td>
		</tr>
	</tbody>
</table>

handling of the cotton rat in studies for the pre-clinical evaluation of oncolytic viruses

Oncolytic viruses are a novel anticancer therapy with the ability to target tumor cells, while leaving healthy cells intact. For this strategy to be successful, recent studies have shown that involvement of the host immune system is essential. Therefore, oncolytic virotherapy should be evaluated within the context of an immunocompetent model. Furthermore, the study of antitumor therapies in tolerized animal models may better recapitulate results seen in clinical trials. Cotton rats, commonly used to study respiratory viruses, are an attractive model to study oncolytic virotherapy as syngeneic models of mammary carcinoma and osteosarcoma are well established. However, there is a lack of published information on the proper handling procedure for these highly excitable rodents. The handling and capture approach outlined minimizes animal stress to facilitate experimentation. This technique hinges upon the ability of the researcher to keep calm during handling and perform procedures in a timely fashion. Finally, we describe how to prepare cotton rat mammary tumor cells for consistent subcutaneous tumor formation, and how to perform intratumoral and intraperitoneal injections. These methods can be applied to a wide range of studies furthering the development of the cotton rat as a relevant pre-clinical model to study antitumor therapy.

ونظرا لطبيعة منفعل للغاية من الفئران القطن، ويجري على دراية والاستفادة من إجراءات الأمثل للحد من وطأة هذه الحيوانات سوف سهولة في استخدامها كنموذج حيوان ما قبل السريرية. واستخدام التقنيات السليمة للتعامل معها تقليل خطر أيضا للباحث. <p class="jove_content" style=";text-align:right;direction...

Watch this Scientific Journal Video about Handling of the Cotton Rat in Studies for the Pre-clinical Evaluation of Oncolytic Viruses at JoVE.com

Handling of the Cotton Rat in Studies for the Pre-clinical Evaluation of Oncolytic Viruses

Cotton rats are extremely excitable and have a strong flight-or-fight response. A handling method optimized to reduce the stress of the animals is described which will make cotton rats more accessible as a preclinical model.

التعامل مع الفأر القطن في الدراسات لتقييم ما قبل السريرية من حال الورم الفيروسات

Oncolytic viruses are a novel anticancer therapy with the ability to target tumor cells, while leaving healthy cells intact.  For this strategy to be ...

handling-cotton-rat-studies-for-pre-clinical-evaluation-oncolytic

Research

JoVE Journal

Medicine

9.2K Views.  McMaster University. Cotton rats are extremely excitable and have a strong flight-or-fight response. A handling method optimized to reduce the stress of the animals is described which will make cotton rats more accessible as a preclinical model. 

Video: Handling of the Cotton Rat in Studies for the Pre-clinical Evaluation of Oncolytic Viruses

Ex Vivo Infection of Live Tissue with Oncolytic Viruses

Oncolytic Viruses (OVs) are novel therapeutics that selectively replicate in and kill tumor cells1. Several clinical trials evaluating the effectiveness of a variety of oncolytic platforms including HSV, Reovirus, and Vaccinia OVs as treatment for cancer are currently underway2-5. One key characteristic of oncolytic viruses is that they can be genetically modified to express reporter transgenes which makes it possible to visualize the infection of tissues by microscopy or bio-luminescence imaging6,7. This offers a unique advantage since it is possible to infect tissues from patients ex vivo prior to therapy in order to ascertain the likelihood of successful oncolytic virotherapy8. To this end, it is critical to appropriately sample tissue to compensate for tissue heterogeneity and assess tissue viability, particularly prior to infection9. It is also important to follow viral replication using reporter transgenes if expressed by the oncolytic platform as well as by direct titration of tissues following homogenization in order to discriminate between abortive and productive infection. The object of this protocol is to address these issues and herein describes 1. The sampling and preparation of tumor tissue for cell culture 2. The assessment of tissue viability using the metabolic dye alamar blue 3. Ex vivo infection of cultured tissues with vaccinia virus expressing either GFP or firefly luciferase 4. Detection of transgene expression by fluorescence microscopy or using an In Vivo Imaging System (IVIS) 5. Quantification of virus by plaque assay. This comprehensive method presents several advantages including ease of tissue processing, compensation for tissue heterogeneity, control of tissue viability, and discrimination between abortive infection and bone fide viral replication.

Ex Vivo Infection of Live Tissue with Oncolytic Viruses

Oncolytic viruses are promising for cancer therapeutics. The ability to ascertain the infectability of live tissue specimens obtained from patients prior to treatment is a unique advantage of this therapeutic approach. This protocol describes how to process tissues for ex vivo infection with oncolytic virus and subsequent viral quantification.

فيفو السابقين العدوى من الأنسجة الحية مع الفيروسات Oncolytic

Oncolytic Viruses (OVs) are novel therapeutics that selectively replicate in and kill tumor cells1. Several clinical trials evaluating the effectiveness ...

The Use of Pharmacological-challenge fMRI in Pre-clinical Research: Application to the 5-HT System

Pharmacological MRI (phMRI) is a new and promising method to study the effects of substances on brain function that can ultimately be used to unravel underlying neurobiological mechanisms behind drug action and neurotransmitter-related disorders, such as depression and ADHD. Like most of the imaging methods (PET, SPECT, CT) it represents a progress in the investigation of brain disorders and the related function of neurotransmitter pathways in a non-invasive way with respect of the overall neuronal connectivity. Moreover it also provides the ideal tool for translation to clinical investigations. MRI, while still behind in molecular imaging strategies compared to PET and SPECT, has the great advantage to have a high spatial resolution and no need for the injection of a contrast-agent or radio-labeled molecules, thereby avoiding the repetitive exposure to ionizing radiations. Functional MRI (fMRI) is extensively used in research and clinical setting, where it is generally combined with a psycho-motor task. phMRI is an adaptation of fMRI enabling the investigation of a specific neurotransmitter system, such as serotonin (5-HT), under physiological or pathological conditions following activation via administration of a specific challenging drug.
The aim of the method described here is to assess brain 5-HT function in free-breathing animals. By challenging the 5-HT system while simultaneously acquiring functional MR images over time, the response of the brain to this challenge can be visualized. Several studies in animals have already demonstrated that drug-induced increases in extracellular levels of e.g. 5-HT (releasing agents, selective re-uptake blockers, etc) evoke region-specific changes in blood oxygenation level dependent (BOLD) MRI signals (signal due to a change of the oxygenated/deoxygenated hemoglobin levels occurring during brain activation through an increase of the blood supply to supply the oxygen and glucose to the demanding neurons) providing an index of neurotransmitter function. It has also been shown that these effects can be reversed by treatments that decrease 5-HT availability16,13,18,7. In adult rats, BOLD signal changes following acute SSRI administration have been described in several 5-HT related brain regions, i.e. cortical areas, hippocampus, hypothalamus and thalamus9,16,15. Stimulation of the 5-HT system and its response to this challenge can be thus used as a measure of its function in both animals and humans2,11.

The goal of this technique is to assess serotonin (5-HT) neurotransmitter function in the live and free-breathing animal with pharmacological magnetic resonance imaging (phMRI) and an intravenous challenge with a selective serotonin reuptake inhibitor (SSRI), fluoxetine.

استعمال الدوائي، التحدي الرنين المغناطيسي الوظيفي في مرحلة ما قبل السريرية للبحوث: بالتطبيق على النظام 5-HT

Pharmacological MRI (phMRI) is a new and promising method to study the effects of substances on brain function that can ultimately be used to unravel ...

Pre-clinical Evaluation of Tyrosine Kinase Inhibitors for Treatment of Acute Leukemia

Receptor tyrosine kinases have been implicated in the development and progression of many cancers, including both leukemia and solid tumors, and are attractive druggable therapeutic targets. Here we describe an efficient four-step strategy for pre-clinical evaluation of tyrosine kinase inhibitors (TKIs) in the treatment of acute leukemia. Initially, western blot analysis is used to confirm target inhibition in cultured leukemia cells. Functional activity is then evaluated using clonogenic assays in methylcellulose or soft agar cultures. Experimental compounds that demonstrate activity in cell culture assays are evaluated in vivo using NOD-SCID-gamma (NSG) mice transplanted orthotopically with human leukemia cell lines. Initial in vivo pharmacodynamic studies evaluate target inhibition in leukemic blasts isolated from the bone marrow. This approach is used to determine the dose and schedule of administration required for effective target inhibition. Subsequent studies evaluate the efficacy of the TKIs in vivo using luciferase expressing leukemia cells, thereby allowing for non-invasive bioluminescent monitoring of leukemia burden and assessment of therapeutic response using an in vivo bioluminescence imaging system. This strategy has been effective for evaluation of TKIs in vitro and in vivo and can be applied for identification of molecularly-targeted agents with therapeutic potential or for direct comparison and prioritization of multiple compounds.

Receptor tyrosine kinases are ectopically expressed in many cancers and have been identified as therapeutic targets in acute leukemia. This manuscript describes an efficient strategy for pre-clinical evaluation of tyrosine kinase inhibitors for the treatment of acute leukemia.

تقييم ما قبل السريرية من التيروزين كيناز مثبطات لعلاج اللوكيميا الحادة

Receptor tyrosine kinases have been implicated in the development and progression of many cancers, including both leukemia and solid tumors, and are ...

Transarterial Administration of Oncolytic Viruses for Locoregional Therapy of Orthotopic HCC in Rats

Hepatocellular carcinoma (HCC) is a disease with limited treatment options and poor prognosis. In recent years, oncolytic virotherapies have proven themselves to be potentially powerful tools to fight malignancy. Due to the unique dual blood supply in the liver, it is possible to apply therapies locally to orthotopic liver tumors, which are predominantly fed by arterial blood flow. We have previously demonstrated that hepatic arterial delivery of oncolytic viruses results in safe and efficient transduction efficiency of multifocal HCC lesions, resulting in significant prolongation of survival in immune competent rats. This procedure closely mimics the application of transarterial embolization in patients, which is the standard palliative care provided to many HCC patients. The ability to administer tumor therapies through the hepatic artery in rats allows for a highly sophisticated preclinical model for evaluating novel viral vectors under development. Here we describe the detailed protocol for microdissection of the hepatic artery for infusion of oncolytic virus vectors to treat orthotopic HCC.

Oncolytic virotherapies are under development as novel therapeutics for the treatment of hepatocellular carcinoma (HCC). Here we describe a method for locoregional therapy of HCC via hepatic arterial administration of oncolytic virus.

إدارة Transarterial من حال الورم فيروسات للعلاج العلاج الموضعي من مثلي HCC في الجرذان

Hepatocellular carcinoma (HCC) is a disease with limited treatment options and poor prognosis.  In recent years, oncolytic virotherapies have proven ...

Pre-clinical Orthotopic Murine Model of Human Prostate Cancer

To study the multifaceted biology of prostate cancer, pre-clinical in vivo models offer a range of options to uncover critical biological information about this disease. The human orthotopic prostate cancer xenograft mouse model provides a useful alternative approach for understanding the specific interactions between genetically and molecularly altered tumor cells, their organ microenvironment, and for evaluation of efficacy of therapeutic regimens. This is a well characterized model designed to study the molecular events of primary tumor development and it recapitulates the early events in the metastatic cascade prior to embolism and entry of tumor cells into the circulation. Thus it allows elucidation of molecular mechanisms underlying the initial phase of metastatic disease. In addition, this model can annotate drug targets of clinical relevance and is a valuable tool to study prostate cancer progression. In this manuscript we describe a detailed procedure to establish a human orthotopic prostate cancer xenograft mouse model.

Prostate cancer is the second most common cause of cancer-related deaths in the United States. An orthotopic cancer model provides a useful approach to understand the biology of prostate cancer and to evaluate the efficacy of therapeutic regimens. This protocol describes detailed steps necessary to establish an orthotopic prostate cancer mouse model.

ما قبل السريرية مثلي فأري موديل سرطان البروستاتا البشرية

To study the multifaceted biology of prostate cancer, pre-clinical in vivo models offer a range of options to uncover critical biological information ...

Use of a Low-flow Digital Anesthesia System for Mice and Rats

A traditional vaporizer depends on flowing gas and atmospheric pressure for passive anesthetic vaporization. Newly developed direct injection vaporizers utilize a syringe pump to directly administer volatile anesthetics into a gas stream. Unlike a traditional vaporizer, it can be used at very low flow rates, making it ideal for use on mice and rats. 
The equipment's capability to use low flow rates could result in a substantial cost savings due to the reduced need for anesthetic agents, compressed gas, and charcoal scavenging filters1. A lower flow rate means less waste of anesthetic gas and likely reduces the risk of anesthetic exposure to laboratory personnel. Thus, the high levels of precision and safety associated with direct injection vaporizers, along with a reduced need for anesthetic agents, compressed gas, and charcoal filters are beneficial for research requiring small animal anesthesia. 
The goal of this protocol is to demonstrate the use of a syringe-driven direct injection vaporizer as part of a digital, low-flow anesthesia system. The direct injection vaporizer is capable of accurately delivering anesthesia at very low flow rates compared to a traditional vaporizer, making it a promising alternative for controlled gas anesthetic delivery to rodents.

Here, we present a protocol to more safely and efficiently administer anesthetic gas to mice using a digital, low flow anesthesia system utilizing a syringe-driven direct injection vaporizer.

استخدام نظام التخدير الرقمية منخفضة لتدفق الفئران والجرذان

A traditional vaporizer depends on flowing gas and atmospheric pressure for passive anesthetic vaporization. Newly developed direct injection vaporizers ...

Analyzing Beneficial Effects of Nutritional Supplements on Intestinal Epithelial Barrier Functions During Experimental Colitis

Inflammatory bowel diseases (IBD), including Crohn&#39;s disease and ulcerative colitis, are chronic relapsing disorders of the intestines. They cause severe problems, such as abdominal cramping, bloody diarrhea, and weight loss, in affected individuals. Unfortunately, there is no cure yet, and treatments only aim to alleviate symptoms. Current treatments include anti-inflammatory and immunosuppressive drugs that may cause severe side effects. This warrants the search for alternative treatment options, such as nutritional supplements, that do not cause side effects. Before their application in clinical studies, such compounds must be rigorously tested for effectiveness and security in animal models. A reliable experimental model is the dextran sulfate sodium (DSS) colitis model in mice, which reproduces many of the clinical signs of ulcerative colitis in humans. We recently applied this model to test the beneficial effects of a nutritional supplement containing vitamins C and E, L-arginine, and &#969;3-polyunsaturated fatty acids (PUFA). We analyzed various disease parameters and found that this supplement was able to ameliorate edema formation, tissue damage, leukocyte infiltration, oxidative stress, and the production of pro-inflammatory cytokines, leading to an overall improvement in the disease activity index. In this article, we explain in detail the correct application of nutritional supplements using the DSS colitis model in C57Bl/6 mice, as well as how disease parameters such as histology, oxidative stress, and inflammation are assessed. Analyzing the beneficial effects of different diet supplements may then eventually open new avenues for the development of alternative treatment strategies that alleviate IBD symptoms and/or that prolong the phases of remission without causing severe side effects.

Current treatments of inflammatory bowel diseases (IBD) aim at alleviating disease symptoms but may cause severe side effects. Thus, alternative strategies are being investigated in animal colitis models. Here, we explain how the beneficial effects of diet supplements on clinical IBD signs are analyzed in such a colitis model.

تحليل مفيد آثار المكملات الغذائية على وظائف الأمعاء طلائي الحاجز أثناء التجريبية التهاب القولون

Inflammatory bowel diseases (IBD), including Crohn&#39;s disease and ulcerative colitis, are chronic relapsing disorders of the intestines. They cause ...

In Vivo Evaluation of the Mechanical and Viscoelastic Properties of the Rat Tongue

The tongue is a highly innervated and vascularized muscle hydrostat on the floor of the mouth of most vertebrates. Its primary functions include supporting mastication and deglutition, as well as taste-sensing and phonetics. Accordingly, the strength and volume of the tongue can impact the ability of vertebrates to accomplish basic activities such as feeding, communicating, and breathing. Human patients with sleep apnea have enlarged tongues, characterized by reduced muscle tone and increased intramuscular fat that can be visualized and quantified by magnetic resonance imaging (MRI). The abilities to measure force generation and viscoelastic properties of the tongue constitute important tools for obtaining functional information to correlate with imaging data. Here, we present techniques for measuring tongue force production in anesthetized Zucker rats via electrical stimulation of the hypoglossal nerves and for determining the viscoelastic properties of the tongue by applying passive Lissajous force/deformation curves.

In Vivo Evaluation of the Mechanical and Viscoelastic Properties of the Rat Tongue

We describe a surgical procedure in an anesthetized rat model for determining the muscle tone and viscoelastic properties of the tongue. The procedure involves specific stimulation of the hypoglossal nerves and application of passive Lissajous force/deformation curves to the muscle.

في فيفو تقييم الخصائص الميكانيكية و اللزجة من اللسان الجرذ

The tongue is a highly innervated and vascularized muscle hydrostat on the floor of the mouth of most vertebrates. Its primary functions include ...

A Pre-Clinical Porcine Model of Orthotopic Heart Transplantation

Fifty-years following the first successful report, cardiac transplantation remains the gold-standard treatment for eligible patients with advanced heart failure. Multiple small-animal models of heart transplantation have been used to study the acute and long-term effects of novel therapies. However, few are tested and demonstrated success in clinical trials. It is of critical importance to evaluate new therapies in a clinically relevant large-animal model for efficient and reliable translation of basic studies&#39;&#160;findings. Here, we describe a pre-clinical large-animal (porcine) model of orthotopic heart transplantation that has been firmly established and previously used to investigate novel cardioprotective strategies. This procedure focuses on acute ischemia-reperfusion injury and is a reliable method to investigate novel interventions which have been tested and validated in smaller experimental models, such as the murine model. We demonstrate its usefulness in assessing cardiac performance during the early post-transplantation period and other potential possibilities enabled by the model.

Here, we describe a pre-clinical large-animal (porcine) model of orthotopic heart transplantation that has been firmly established and utilized to investigate novel cardioprotective strategies.

نموذج بورسين ما قبل السريرية لزراعة القلب التقويمي

Fifty-years following the first successful report, cardiac transplantation remains the gold-standard treatment for eligible patients with advanced heart ...

Pre-clinical Model of Cardiac Donation after Circulatory Death

Cardiac transplantation demand is on the rise; nevertheless, organ availability is limited due to a paucity of suitable donors. Organ donation after circulatory death (DCD) is a solution to address this limited availability, but due to a period of prolonged warm ischemia and the risk of tissue injury, its routine use in cardiac transplantation is seldom seen. In this manuscript we provide a detailed protocol closely mimicking current clinical practices in the context of DCD with continuous monitoring of heart function, allowing for the evaluation of novel cardioprotective strategies and interventions to decrease ischemia-reperfusion injury.
In this model, the DCD protocol is initiated in anesthetized Lewis rats by stopping ventilation to induce circulatory death. When systolic blood pressure drops below 30 mmHg, the warm ischemic time is initiated. After a pre-set warm ischemic period, hearts are flushed with a normothermic cardioplegic solution, procured, and mounted onto a Langendorff ex vivo heart perfusion system. Following 10 min of initial reperfusion and stabilization, cardiac reconditioning is continuously evaluated for 60 min using intraventricular pressure monitoring. A heart injury is assessed by measuring cardiac troponin T and the infarct size is quantified by histological staining. The warm ischemic time can be modulated and tailored to develop the desired amount of structural and functional damage. This simple protocol allows for the evaluation of different cardioprotective conditioning strategies introduced at the moment of cardioplegia, initial reperfusion and/or during ex vivo perfusion. Findings obtained from this protocol can be reproduced in large models, facilitating clinical translation.

This protocol shows a simple and flexible approach for the evaluation of new conditioning agents or strategies to increase the feasibility of cardiac donation after circulatory death.

نموذج ما قبل السريرية للتبرع القلبي بعد الوفاة الدورة الدموية

Cardiac transplantation demand is on the rise; nevertheless, organ availability is limited due to a paucity of suitable donors. Organ donation after ...