The authors would like to thank Trevor Lawley at the Wellcome Trust Sanger Institute for C. difficile R20291 spores and James S. Guy at the North Carolina State University College of Veterinary Medicine for Vero cells, both utilized in this manuscript. Animal histopathology was performed in the LCCC Animal Histopathology Core Facility at the University of North Carolina at Chapel Hill, with special assistance from Traci Raley and Amanda Brown. The LCCC Animal Histopathology Core is supported in part by an NCI Center Core Support Grant (2P30CA016086-40) to the UNC Lineberger Comprehensive Cancer Center. We would also like to thank Vincent Young, Anna Seekatz, Jhansi Leslie, and Cassie Schumacher for helpful discussions on the Vero cell cytotoxicity assay protocol. JAW is funded by the Ruth L. Kirschstein National Research Service Award Research Training grant T32OD011130 by NIH. CMT is funded by the career development award in metabolomics grant K01GM109236 by the NIGMS of the NIH.

<ol>
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The authors have nothing to disclose at this time.

This protocol characterizes the clinical course, including weight loss, bacterial colonization, toxin cytotoxicity, and histopathological changes in the gastrointestinal tract, of antibiotic-treated mice challenged with C. difficile R20291 spores. There are several critical steps within the protocol where attention to detail is essential. Accurate calculation of the C. difficile spore inoculum is critical. This calculation is based on the original C. difficile spore stock enumeration, which sho...

Clostridium difficile é um anaeróbio,, bacilo formador de esporos gram-positivo que causa diarreia com risco de vida 1. Infecção por C. difficile (CDI) está associada com aumento da morbidade e mortalidade humana e resulta em mais de US $ 4,8 bilhões em custos de saúde por ano 1-4. Em 2013, os Centros de Controle e Prevenção de Doenças categorizados C. difficile como um risco de resistência a antibióticos urgente, indicando que ele representa uma ameaça urgente de saúde pública 1. Atualmente, o tratamento antibiótico com vancomicina e metronidazol são considerados o padrão de cuidado para CDI 5. Infelizmente, a recorrência de CDI após o sucesso do tratamento com antibióticos é elevada, ocorrendo em 20 - 30% dos pacientes 2,5-7. Portanto, a descoberta de novas terapias contra este agente patogénico entérico é necessário. Para avaliar terapêuticas contra a C. difficile, um modelo animal de uma aproximação da doença humana em ACestirpe linically relevante é necessária. Inicialmente, os postulados de Koch foram estabelecidos para C. difficile em 1977 usando um modelo de hamster sírio tratados com clindamicina 8. Este modelo ainda é utilizado hoje para investigar os efeitos de toxinas C. difficile na patogênese 9,10. No entanto, CDI no modelo de hamster resulta em altas taxas de mortalidade e não harmoniza as manifestações de doenças crónicas insidiosas que pode ser visto em humanos com CDI 10,11. Com base na acessibilidade e reagente disponibilidade de plataformas de murino em pesquisa, um modelo de mouse CDI é relevante. Em 2008, um modelo de ratinho robusta de CDI foi estabelecida tratando ratos com um cocktail de antibióticos em água potável (canamicina, a gentamicina, a colistina, metronidazol e a vancomicina) durante 3 dias, seguido de uma injecção intraperitoneal de 12 de clindamicina. Este ratos rendido suscetíveis a colite CDI e grave. Dependerdendo da dose de inoculo administrada, uma gama de sinais clínicos e letalidade pode ser observada usando este modelo. Desde essa altura, vários regimes de antibióticos que têm sido investigados alterar a microbiota intestinal murino, diminuindo a resistência à colonização ponto em que o C. difficile pode colonizar o tracto gastrointestinal (revisto em Best et al. E Lawley &amp; Young) 13,14. Mais recentemente, um amplo espectro de cefalosporina, cefoperazona, dada na água de beber durante 5 ou 10 dias reprodutível torna camundongos suscetíveis ao CDI 15. Uma vez que a administração de cefalosporinas de terceira geração estão associados com um risco aumentado de CDI em seres humanos, o uso do modelo de cefoperazona reflecte com mais precisão da doença 16 de ocorrência natural. Ratinhos susceptíveis a C. difficile tratados com cefoperazona foram desafiados com ambos os esporos de C. difficile e células vegetativas de uma variedade de estirpes que varia em clínicarelevância e virulência 17. Apesar de alguns dos estudos originais utilizando C. difficile células vegetativas como a forma infecciosa, esporos de C. difficile são considerados o principal modo de transmissão 18. Na última década, C. difficile R20291, um NAP1 / BI / 027 tensão, surgiu, causando epidemias de CDI 19,20. Procurou-se determinar o curso clínico da doença quando os ratos tratados com cefoperazona foram desafiados com a estirpe de C. difficile clinicamente relevante e geneticamente-tratável, R20291. Este protocolo detalha o curso clínico, incluindo perda de peso, a colonização bacteriana, toxina da citotoxicidade, e alterações histopatológicas no tracto gastrointestinal dos ratinhos infectados com esporos de C. difficile R20291. Em geral, este modelo de rato revela-se uma plataforma experimental para o CDI aproximação doença humana. Este modelo de ratinho caracterizado pode assim ser utilizada para avaliar os efeitosde novas terapêuticas no melhoramento da doença clínica e no restabelecimento da colonização da resistência contra a C. difficile.

<table><tbody><tr><td>#62 Perisept Sporidicial Disinfectant Cleaner&amp;nbsp;</td><td>SSS Navigator</td><td>48027</td><td>This product will require dilution as recommended by the manufacturer</td></tr><tr><td>0.22 &amp;mu;m filter</td><td>Fisherbrand</td><td>09-720-3</td><td>Alternative to filter plate for indivdiual samples tested in the Vero Cell Assay</td></tr><tr><td>0.25% Trypsin-EDTA</td><td>Gibco</td><td>25200-056</td><td>Needs to be heated in water bath at 37 &amp;deg;C prior to use</td></tr><tr><td>0.4% Trypan Blue</td><td>Gibco</td><td>15250-061</td><td></td></tr><tr><td>1% Peniciilin/Streptomycin</td><td>Gibco</td><td>15070-063</td><td></td></tr><tr><td>10% heat inactivated FBS</td><td>Gibco</td><td>16140-071</td><td>Needs to be heated in water bath at 37 &amp;deg;C prior to use</td></tr><tr><td>1 ml plastic syringe&amp;nbsp;</td><td>BD Medical Supplies</td><td>309628</td><td></td></tr><tr><td>1x PBS</td><td>Gibco</td><td>10010-023</td><td></td></tr><tr><td>2 ml Micro Centrifuge Screw Cap</td><td>Corning</td><td>430917</td><td></td></tr><tr><td>96 well cell culture flat bottom plate</td><td>Costar Corning</td><td>CL3595</td><td></td></tr><tr><td>96 well filter plate</td><td>Millipore</td><td>MSGVS2210</td><td></td></tr><tr><td>Adhesive Seal</td><td>ThermoScientific</td><td>AB-0558</td><td></td></tr><tr><td>Bacto Agar</td><td>Becton Dickinson</td><td>214010</td><td>Part of TCCFA plates (see below)</td></tr><tr><td>Bacto Proteose Peptone</td><td>Becton Dickinson</td><td>211684</td><td>Part of TCCFA plates (see below)</td></tr><tr><td>Cefoperazone</td><td>MP Bioworks</td><td>199695</td><td></td></tr><tr><td>Cefoxitine</td><td>Sigma</td><td>C47856</td><td>Part of TCCFA plates (see below)</td></tr><tr><td>Clostridium difficile Antitoxin Kit</td><td>Tech Labs</td><td>T5000</td><td>Used as control for Vero Cell Assay</td></tr><tr><td>Clostridium difficile Toxin A</td><td>List Biological Labs</td><td>152C</td><td>Positive control for Vero Cell Assay</td></tr><tr><td>D-cycloserine</td><td>Sigma</td><td>C6880</td><td>Part of TCCFA plates (see below)</td></tr><tr><td>Distilled Water</td><td>Gibco</td><td>15230</td><td></td></tr><tr><td>DMEM 1x Media</td><td>Gibco</td><td>11965-092</td><td>Needs to be heated in water bath at 37 &amp;deg;C prior to use</td></tr><tr><td>Fructose</td><td>Fisher</td><td>L95500</td><td>Part of TCCFA plates (see below)</td></tr><tr><td>Hemocytometer</td><td>Bright-Line, Sigma</td><td>Z359629</td><td></td></tr><tr><td>KH&lt;sub&gt;2&lt;/sub&gt;PO&lt;sub&gt;4&lt;/sub&gt;</td><td>Fisher</td><td>P285-500</td><td>Part of TCCFA plates (see below)</td></tr><tr><td>MgSO&lt;sub&gt;4&lt;/sub&gt; (anhydrous)</td><td>Sigma</td><td>M2643</td><td>Part of TCCFA plates (see below)</td></tr><tr><td>Millex-GS 0.22 &amp;mu;m filter</td><td>Millex-GS</td><td>SLGS033SS</td><td>Filter for TCCFA plates&amp;nbsp;</td></tr><tr><td>Na&lt;sub&gt;2&lt;/sub&gt;HPO&lt;sub&gt;4&lt;/sub&gt;</td><td>Sigma</td><td>S-0876</td><td>Part of TCCFA plates (see below)</td></tr><tr><td>NaCl</td><td>Fisher</td><td>S640-3</td><td>Part of TCCFA plates (see below)</td></tr><tr><td>Number 10 disposable scalpel blade</td><td>Miltex, Inc</td><td>4-410</td><td></td></tr><tr><td>PCR Plates</td><td>Fisherbrand</td><td>14230244</td><td></td></tr><tr><td>Plastic petri dish</td><td>Kord-Valmark Brand</td><td>2900</td><td></td></tr><tr><td>Sterile plastic L-shaped cell spreader</td><td>Fisherbrand</td><td>14-665-230</td><td></td></tr><tr><td>Syringe Stepper</td><td>Dymax Corporation</td><td>T15469</td><td></td></tr><tr><td>Taurocholate</td><td>Sigma</td><td>T4009</td><td>Part of TCCFA plates (see below)</td></tr><tr><td>Ultrapure distilled water</td><td>Invitrogen</td><td>10977-015</td><td></td></tr><tr><td>C57BL/6J Mice</td><td>The Jackson Laboratory</td><td>664</td><td>Mice should be 5 - 8 weeks of age</td></tr><tr><td>Olympus BX43F light microscope</td><td>Olympus Life Science</td><td></td><td></td></tr><tr><td>DP27 camera</td><td>Olympus Life Science</td><td></td><td></td></tr><tr><td>cellSens Dimension software&amp;nbsp;</td><td>Olympus Life Science</td><td></td><td></td></tr></tbody></table>

cefoperazone-treated mouse model of clinically-relevant clostridium difficile strain r20291

Clostridium difficile is an anaerobic, gram-positive, spore-forming enteric pathogen that is associated with increasing morbidity and mortality and consequently poses an urgent threat to public health. Recurrence of a C. difficile infection (CDI) after successful treatment with antibiotics is high, occurring in 20-30% of patients, thus necessitating the discovery of novel therapeutics against this pathogen. Current animal models of CDI result in high mortality rates and thus do not approximate the chronic, insidious disease manifestations seen in humans with CDI. To evaluate therapeutics against C. difficile, a mouse model approximating human disease utilizing a clinically-relevant strain is needed. This protocol outlines the cefoperazone mouse model of CDI using a clinically-relevant and genetically-tractable strain, R20291. Techniques for clinical disease monitoring, C. difficile bacterial enumeration, toxin cytotoxicity, and histopathological changes throughout CDI in a mouse model are detailed in the protocol. Compared to other mouse models of CDI, this model is not uniformly lethal at the dose administered, allowing for the observation of a prolonged clinical course of infection concordant with the human disease. Therefore, this cefoperazone mouse model of CDI proves a valuable experimental platform to assess the effects of novel therapeutics on the amelioration of clinical disease and on the restoration of colonization resistance against C. difficile.

Durante um estudo representativo, com 5 semanas de idade C57BL / 6 murganhos WT foram pré-tratados com cefoperazona na sua água de beber (0,5 mg / ml) durante 5 dias e deixados a 2 dias lavar com água de beber. Os ratinhos foram desafiados com 10 5 esporos de C. difficile R20291 através de sonda oral no dia 0 (Figura 1A). Os ratinhos foram monitorizados para a perda de peso e sinais clínicos (letargia, inapetência, diarréia e postura arqueada) ...

Watch this Scientific Journal Video about Cefoperazone-treated Mouse Model of Clinically-relevant Clostridium difficile Strain R20291 at JoVE.com

Cefoperazone-treated Mouse Model of Clinically-relevant Clostridium difficile Strain R20291

Este protocolo descreve o modelo do rato cefoperazona de infecção por Clostridium difficile (CDI), utilizando uma estirpe clinicamente relevante e geneticamente-tratável, R20291. Ênfase na monitorização clínica da doença, C. difficile enumeração bacteriana, a citotoxicidade de toxinas, e alterações histopatológicas em todo CDI em um modelo de rato estão detalhadas no protocolo.

tratados com Cefoperazone Rato Modelo de clinicamente relevante<em&gt; Clostridium difficile</em&gt; R20291 Strain

Clostridium difficile is an anaerobic, gram-positive, spore-forming enteric pathogen that is associated with increasing morbidity and mortality and ...

cefoperazone-treated-mouse-model-clinically-relevant-clostridium

Research

JoVE Journal

Immunology and Infection

Cefoperazone-treated Mouse Model of Clinically-relevant Clostridium difficile Strain R20291

12.2K visualizações.  North Carolina State University College of Veterinary Medicine.  Este protocolo descreve o modelo do rato cefoperazona de infecção por Clostridium difficile (CDI), utilizando uma estirpe clinicamente relevante e geneticamente-tratável, R20291. Ênfase na monitorização clínica da doença, C. difficile enumeração bacteriana, a citotoxicidade de toxinas, e alterações histopatológicas em todo CDI em um modelo de rato estão detalhadas no protocolo. 

Vídeo: Cefoperazone-treated Mouse Model of Clinically-relevant Clostridium difficile Strain R20291

The Citrobacter rodentium Mouse Model: Studying Pathogen and Host Contributions to Infectious Colitis

This protocol outlines the steps required to produce a robust model of infectious disease and colitis, as well as the methods used to characterize Citrobacter rodentium infection in mice. C. rodentium is a gram negative, murine specific bacterial pathogen that is closely related to the clinically important human pathogens enteropathogenic E. coli and enterohemorrhagic E. coli. Upon infection with C. rodentium, immunocompetent mice suffer from modest and transient weight loss and diarrhea. Histologically, intestinal crypt elongation, immune cell infiltration, and goblet cell depletion are observed. Clearance of infection is achieved after 3 to 4 weeks. Measurement of intestinal epithelial barrier integrity, bacterial load, and histological damage at different time points after infection, allow the characterization of mouse strains susceptible to infection.
The virulence mechanisms by which bacterial pathogens colonize the intestinal tract of their hosts, as well as specific host responses that defend against such infections are poorly understood. Therefore the C. rodentium model of enteric bacterial infection serves as a valuable tool to aid in our understanding of these processes. Enteric bacteria have also been linked to Inflammatory Bowel Diseases (IBDs). It has been hypothesized that the maladaptive chronic inflammatory responses seen in IBD patients develop in genetically susceptible individuals following abnormal exposure of the intestinal mucosal immune system to enteric bacteria. Therefore, the study of models of infectious colitis offers significant potential for defining potentially pathogenic host responses to enteric bacteria. C. rodentium induced colitis is one such rare model that allows for the analysis of host responses to enteric bacteria, furthering our understanding of potential mechanisms of IBD pathogenesis; essential in the development of novel preventative and therapeutic treatments.

The Citrobacter rodentium Mouse Model: Studying Pathogen and Host Contributions to Infectious Colitis

Citrobacter rodentium infection provides a valuable model to study enteric bacterial infections as well as host immune responses and colitis in mice. This protocol outlines the measurement of barrier integrity, pathogen load and histological damage allowing for the thorough characterization of pathogen and host contributions to murine infectious colitis.

O<em&gt; Citrobacter rodentium</em&gt; Modelo de Rato: Contribuições Estudar patógeno e hospedeiro para Colite Infecciosa

This protocol  outlines the steps required to produce a robust model of infectious disease and  colitis, as well as the methods used to characterize ...

Imunologia e Infecção

4D Multimodality Imaging of Citrobacter rodentium Infections in Mice

This protocol outlines the steps required to longitudinally monitor a bioluminescent bacterial infection using composite 3D diffuse light imaging tomography with integrated &mu;CT (DLIT-&mu;CT) and the subsequent use of this data to generate a four dimensional (4D) movie of the infection cycle. To develop the 4D infection movies and to validate the DLIT-&mu;CT imaging for bacterial infection studies using an IVIS Spectrum CT, we used infection with bioluminescent C. rodentium, which causes self-limiting colitis in mice. In this protocol, we outline the infection of mice with bioluminescent C. rodentium and non-invasive monitoring of colonization by daily DLIT-&mu;CT imaging and bacterial enumeration from feces for 8 days.
The use of the IVIS Spectrum CT facilitates seamless co-registration of optical and &mu;CT scans using a single imaging platform. The low dose &mu;CT modality enables the imaging of mice at multiple time points during infection, providing detailed anatomical localization of bioluminescent bacterial foci in 3D without causing artifacts from the cumulative radiation. Importantly, the 4D movies of infected mice provide a powerful analytical tool to monitor bacterial colonization dynamics in vivo.

4D Multimodality Imaging of Citrobacter rodentium Infections in Mice

Multi-modality imaging is a valuable approach for studying bacterial colonization in small animal models. This protocol outlines infection of mice with bioluminescent Citrobacter rodentium and the longitudinal monitoring of bacterial colonization using composite 3D diffuse light imaging tomography with &mu;CT imaging to create a 4D movie of C. rodentium infection.

4D Multimodalidade de imagens de<em&gt; Citrobacter rodentium</em&gt; Infecções em Ratos

This protocol outlines the steps required to  longitudinally monitor a bioluminescent bacterial infection using composite 3D diffuse light imaging ...

Development of a Larval Zebrafish Infection Model for Clostridioides difficile

Clostridioides difficile infection (CDI) is considered to be one of the most common healthcare-associated gastrointestinal infections in the United States. The innate immune response against C. difficile has been described, but the exact roles of neutrophils and macrophages in CDI are less understood. In the current study, Danio rerio (zebrafish) larvae are used to establish a C. difficile infection model for imaging the behavior and cooperation of these innate immune cells in vivo. To monitor C. difficile, a labeling protocol using a fluorescent dye has been established. A localized infection is achieved by microinjecting labeled C. difficile, which actively grows in the zebrafish intestinal tract and mimics the intestinal epithelial damage in CDI. However, this direct infection protocol is invasive and causes microscopic wounds, which can affect experimental results. Hence, a more noninvasive microgavage protocol is described here. The method involves delivery of C. difficile cells directly into the intestine of zebrafish larvae by intubation through the open mouth. This infection method closely mimics the natural infection route of C. difficile.

Development of a Larval Zebrafish Infection Model for Clostridioides difficile

Presented here is a safe and effective method to infect zebrafish larvae with fluorescently labeled anaerobic C. difficile by microinjection and noninvasive microgavage.

Desenvolvimento de um Modelo de Infecção de Zebrafish Larval para Clostridioides difficile

Clostridioides difficile infection (CDI) is considered to be one of the most common healthcare-associated gastrointestinal infections in the United ...

Biologia do Desenvolvimento

Establishment and Characterization of UTI and CAUTI in a Mouse Model

Urinary tract infections (UTI) are highly prevalent, a significant cause of morbidity and are increasingly resistant to treatment with antibiotics. Females are disproportionately afflicted by UTI: 50% of all women will have a UTI in their lifetime. Additionally, 20-40% of these women who have an initial UTI will suffer a recurrence with some suffering frequent recurrences with serious deterioration in the quality of life, pain and discomfort, disruption of daily activities, increased healthcare costs, and few treatment options other than long-term antibiotic prophylaxis. Uropathogenic Escherichia coli (UPEC) is the primary causative agent of community acquired UTI. Catheter-associated UTI (CAUTI) is the most common hospital acquired infection accounting for a million occurrences in the US annually and dramatic healthcare costs. While UPEC is also the primary cause of CAUTI, other causative agents are of increased significance including Enterococcus faecalis. Here we utilize two well-established mouse models that recapitulate many of the clinical characteristics of these human diseases. For UTI, a C3H/HeN model recapitulates many of the features of UPEC virulence observed in humans including host responses, IBC formation and filamentation. For CAUTI, a model using C57BL/6 mice, which retain catheter bladder implants, has been shown to be susceptible to E. faecalis bladder infection. These representative models are being used to gain striking new insights into the pathogenesis of UTI disease, which is leading to the development of novel therapeutics and management or prevention strategies.

The ability to model urinary tract infections (UTI) is crucial in order to be able to understand bacterial pathogenesis and spawn the development of novel therapeutics. This work&#8217;s goal is to demonstrate mouse models of experimental UTI and catheter associated UTI that recapitulate and predict findings seen in humans.

Criação e Caracterização da UTI e CAUTI em um modelo de rato

Urinary tract infections (UTI) are highly prevalent, a significant cause of morbidity and are increasingly resistant to treatment with antibiotics. ...

Medicina

A Controlled Mouse Model for Neonatal Polymicrobial Sepsis

Neonatal sepsis remains a global burden. A preclinical model to screen effective prophylactic or therapeutic interventions is needed. Neonatal mouse polymicrobial sepsis can be induced by injecting cecal slurry intraperitoneally into day of life 7 mice and monitoring them for the following week. Presented here are the detailed steps necessary for the implementation of this neonatal sepsis model. This includes making a homogeneous cecal slurry stock, diluting it to a weight- and litter-adjusted dose, an outline of the monitoring schedule, and a definition of observed health categories used to define humane endpoints. The generation of a homogeneous cecal slurry stock from pooled donors allows for the administration into many litters over time, reducing the variation between donors, and preventing the use of potentially toxic glycerol. The monitoring strategy used allows for the anticipation of survival outcome and the identification of mice that would later progress to death, allowing for an earlier identification of the humane endpoint. Two main behavioral features are used to define the health scores, namely, the ability of the neonatal mice to right themselves when placed on their back and their level of mobility. These criteria could potentially be applied to address humane endpoints in other studies of neonatal disease in mice, as long as a pilot study is performed to confirm accuracy. In conclusion, this approach provides a standardized method to model newborn sepsis in mice, while providing resources to assess animal welfare used to define early humane endpoints for challenged animals.

This protocol provides the necessary steps to establish and evaluate neonatal sepsis in 7-day-old mice.

Um modelo de Mouse controlado para sepse Neonatal Polymicrobial

Neonatal sepsis remains a global burden. A preclinical model to screen effective prophylactic or therapeutic interventions is needed. Neonatal mouse ...

Inducing Meningococcal Meningitis Serogroup C in Mice via Intracisternal Delivery

Neisseria meningitidis (meningococcus) is a narrow-host-range microorganism, globally recognized as the leading cause of bacterial meningitis. Meningococcus is a transient colonizer of human nasopharynx of approximately 10% of healthy subject. In particular circumstances, it acquires an invasive ability to penetrate the mucosal barrier and invades the bloodstream causing septicaemia. In the latest case, fulminating sepsis could arise even without the consequent development of meningitis. Conversely, bacteria could poorly multiply in the bloodstream, cross the blood brain barrier, reach the central nervous system, leading to fulminant meningitis. The murine models of bacterial meningitis represent a useful tool to investigate the host-pathogen interactions and to analyze the pathogenetic mechanisms responsible for this lethal disease. Although, several experimental model systems have been evaluated over the last decades, none of these were able to reproduce the characteristic pathological events of meningococcal disease. In this experimental protocol, we describe a detailed procedure for the induction of meningococcal meningitis in a mouse model based on the intracisternal inoculation of bacteria. The peculiar signs of human meningitis were recorded in the murine host through the assessment of clinical parameters (e.g., temperature, body weight), evaluation of survival rate, microbiological analysis and histological examination of brain injury. When using intracisternal (i.cist.) inoculum, meningococci complete delivery directly into cisterna magna, leading to a very efficient meningococcal replication in the brain tissue. A 1,000-fold increase of viable count of bacteria is observed in about 18 h. Moreover, meningococci are also found in the spleen, and liver of infected mice, suggesting that the liver may represent a target organ for meningococcal replication.

Here, we describe a method to induce meningococcal meningitis through an intracisternal route of infection in adult mice. We present a step by step protocol of meningococcal infection from the preparation of inoculum to the intracisternal infection; then record the animal survival and evaluate the bacterial loads in murine tissues.

Indução meningocócica meningite sorogrupo C em camundongos via parto intracisternal

Neisseria meningitidis (meningococcus) is a narrow-host-range microorganism, globally recognized as the leading cause of bacterial meningitis. ...

Murine Distal Colostomy, A Novel Model of Diversion Colitis in C57BL/6 Mice

Diversion colitis (DC) is a frequent clinical condition occurring in patients with bowel segments excluded from the fecal stream as a result of a diverting enterostomy. The etiology of this disease remains ill-defined but appears to differ from that of classical inflammatory bowel diseases such as Crohn's disease and ulcerative colitis. Research aimed to decipher the pathophysiological mechanisms leading to the development of this disease has been severely hampered by the lack of an appropriate murine model. This protocol generates a murine model of DC that facilitates the study of the immune system's role and its interaction with the microbiome in the development of DC. In this model using C57BL/6 animals, distal parts of the colon are excluded from the fecal stream by creating a distal colostomy, triggering the development of mild to moderate inflammation in the excluded bowel segments and reproducing the hallmark lesions of human DC with a moderate systemic inflammatory response. In contrast to the rat model, a large number of genetically-modified murine models on the C57BL/6 background are available. The combination of these animals with our model allows the potential roles of individual cytokines, chemokines, or receptors of bioactive molecules (e.g., interleukin (IL)-17; IL-10, chemokine CXCL13, chemokine receptors CXCR5 and CCR7, and the sphingosine-1-phosphate receptor 4) to be assessed in the pathogenesis of DC. The availability of congenic mouse strains on the C57BL/6 background largely facilitates transfer experiments to establish the roles of distinct cell types involved in the etiology of DC. Finally, the model offers the opportunity to assess the influences of local interventions (e.g., modification of the local microbiome or local anti-inflammatory therapy) on mucosal immunity in affected and non-affected bowel segments and the on systemic immune homeostasis.

Murine distal colostomy provides a murine model for human diversion colitis, a predominantly lymphocytic colitis in colon segment excluded from the fecal stream.

Murino colostomia Distal, um novo modelo de colite de diversão em camundongos C57BL/6

Diversion colitis (DC) is a frequent clinical condition occurring in patients with bowel segments excluded from the fecal stream as a result of a ...

A Contemporary Warming/Restraining Device for Efficient Tail Vein Injections in a Murine Fungal Sepsis Model

In rodent models, tail vein injections are important methods for intravenous administration of experimental agents. Tail vein injections typically involve warming of the animal to promote vasodilation, which aids in both the identification of the blood vessels and positioning of the needle into the vessel lumen while securely restraining the animal. Although tail vein injections are common procedures in many protocols and are not considered highly technical if performed correctly, accurate and consistent injections are crucial to obtain reproducible results and minimize variability. Conventional methods for inducing vasodilation prior to tail vein injections generally depend on the use of a heat source such as a heat lamp, electrical/rechargeable heat pads, or pre-heated water at 37 &#176;C. Despite being readily accessible in a standard laboratory setting, these tools evidently suffer from poor/limited thermo-regulatory capacity. Similarly, although various forms of restraining devices are commercially available, they must be used carefully to avoid trauma to the animals. These limitations of the current methods create unnecessary variables in experiments or result in varying outcomes between experiments and/or laboratories.
In this article, we demonstrate an improved protocol using an innovative device that combines an independent, thermally regulated, warming device with an adjustable restraining unit into one system for efficient streamlined tail vein injection. The example we use is an intravenous model of fungal bloodstream infection that results in sepsis. The warming apparatus consists of a heat-reflective acrylic box installed with an adjustable automatic thermostat to maintain the internal temperature at a pre-set threshold. Likewise, the width and height of the cone restraining apparatus can be adjusted to safely accommodate various rodent sizes. With the advanced and versatile features of the device, the technique shown here could become a useful tool across a range of research areas involving rodent models that employ tail vein injections.

Here, we present an effective and efficient method for rodent tail vein injections using a uniquely designed warming/restraining device. By streamlining the initiation of vasodilation and restraining processes, this protocol allows accurate and timely intravenous injections of large groups of animals with minimal distress.

Um dispositivo de aquecimento/contenção contemporâneo para injeções eficientes de veia de cauda em um modelo de sepse fúngica murina

In rodent models, tail vein injections are important methods for intravenous administration of experimental agents. Tail vein injections typically involve ...

Recurrent Escherichia coli Urinary Tract Infection Triggered by Gardnerella vaginalis Bladder Exposure in Mice

Recurrent urinary tract infections (rUTI) caused by uropathogenic Escherichia coli (UPEC) are common and costly. Previous articles describing models of UTI in male and female mice have illustrated the procedures for bacterial inoculation and enumeration in urine and tissues. During an initial bladder infection in C57BL/6 mice, UPEC establish latent reservoirs inside bladder epithelial cells that persist following clearance of UPEC bacteriuria. This model builds on these studies to examine rUTI caused by the emergence of UPEC from within latent bladder reservoirs. The urogenital bacterium Gardnerella vaginalis is used as the trigger of rUTI in this model because it is frequently present in the urogenital tracts of women, especially in the context of vaginal dysbiosis that has been associated with UTI. In addition, a method for in situ bladder fixation followed by scanning electron microscopy (SEM) analysis of bladder tissue is also described, with potential application to other studies involving the bladder.

Recurrent Escherichia coli Urinary Tract Infection Triggered by Gardnerella vaginalis Bladder Exposure in Mice

A mouse model of uropathogenic E. coli (UPEC) transurethral inoculation to establish latent intracellular bladder reservoirs and subsequent bladder exposure to G. vaginalis to induce recurrent UPEC UTI is demonstrated. Also demonstrated are the enumeration of bacteria, urine cytology, and in situ bladder fixation and processing for scanning electron microscopy.

Infecção recorrente do trato urinário de Escherichia coli desencadeada por gardnerella vaginalis exposição bexiga em camundongos

Recurrent urinary tract infections (rUTI) caused by uropathogenic Escherichia coli (UPEC) are common and costly. Previous articles describing models of ...

Estabelecendo um modelo de camundongo para infecção relacionada a cateter associada a Candida albicans

A Catheter-Related Candida albicans Infection Model in Mouse

Catheter-related infection (CRI) is a common nosocomial infection caused by candida albicans during catheter implantation. Typically, biofilms are formed on the outer surface of the catheter and lead to disseminated infections, which are fatal to patients. There are no effective prevention and treatment management in clinics. Therefore, it is urgent to establish an animal model of CRI for the preclinical screening of new strategies for its prevention and treatment. In this study, a polyethylene catheter, a widely used medical catheter, was inserted into the back of the BALB/c mice after hair removal. Candida albicans ATCC MYA-2876 (SC5314) expressing enhanced green fluorescent protein was subsequently inoculated on the skin's surface along the catheter. Intense fluorescence was observed on the surface of the catheter under a fluorescent microscope 3 days later. Mature and thick biofilms were found on the surface of the catheter via scanning electron microscopy. These results indicated the adhesion, colonization, and biofilm formation of candida albicans on the surface of the catheter. The hyperplasia of the epidermis and the infiltration of inflammatory cells in the skin specimens indicated the histopathological changes of the CRI-associated skin. To sum up, a mouse CRI model was successfully established. This model is expected to be helpful in the research and development of therapeutic management for candida albicans associated CRI.

Autor em destaque: Aprimorando a detecção de Candida albicans em infecções por cateter usando marcação de proteína fluorescente 

We establish a mouse model of C.albicans-associated catheter-related infection (CRI), in which biofilm forms on the catheter, and the interaction between C.albicans and host correlates well with the clinical CRI. This model helps screen therapies for C.albicans biofilm-associated CRI, laying a foundation for clinical transformation.

Modelo de Infecção por Candida albicans Relacionada a Cateter em Camundongos

Catheter-related infection (CRI) is a common nosocomial infection caused by candida albicans during catheter implantation. Typically, biofilms are formed ...

tratados com Cefoperazone Rato Modelo de clinicamente relevante

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