Les auteurs remercient Dr Lee Khai Pin, tête & hôpital Consultant Senior, enfants d’urgence, KK femmes et enfants, 100 Bukit Timah Road, Singapour du support administratif avec la production de la vidéo de l’article. Article reproduit avec la permission de « Poche métal détecteur pour métalliques étrangers corps Ingestion in Pediatric Emergency » ; Août 2018:85 (8) : 618-624 ; Pascaline Binte Hamzah, vigile James, Suraj Manickam Sashikumar Ganapathy : copyright The Indian Journal of Pediatrics.

Le protocole suit les directives du Comité d’éthique institutionnel de la recherche humaine. Le jury d’examen de l’établissement central fourni l’approbation éthique pour l’étude.
1. le participant de dépistage
<ol><li>Recruter des patients qui se présentent au service des urgences pédiatrique avec histoire d’ingestion de corps étrangers.</li>
	<li>Exclure les patients qui sont en détresse respiratoire et a implanté des périphériques tels que pace makers.</li>
</ol>2. préparer le Patient
<ol><li>Habiller le patient dans une chemise d’hôpital.</li>
	<li>Supprimer tous les éléments pouvant contenir des objets métalliques tels que vêtements, lunettes, boucles d’oreilles, pendentifs et ornements avant l’examen pour éviter toute interférence avec la projection de DMOM.</li>
	<li>Installer le patient dans le centre de la pièce loin d’autres interférences potentielles métalliques.</li>
</ol>3. préparer l’examinateur et les aidants naturels
<ol><li>Retirez tous les accessoires métalliques tels que bijoux et montres.</li>
	<li>Demander l’aidant à enlever tous les accessoires métalliques tels que bijoux et montres.</li>
</ol>4. détecteur de dépistage
<ol><li>Le DMOM (Figure 1) permet d’effectuer l’examen préalable.</li>
	<li>Confirmer l’état de fonctionnement de la DMOM en suscitant un signal audiovisuel positif en ondulant sur un morceau de métal.</li>
	<li>Effectuer le DMOM numérisation en position debout pour les enfants plus grands.</li>
	<li>Effectuer le DMOM numérisation en position debout pour les nourrissons en ayant la cale aidant le patient convenablement.</li>
	<li>Tenez les mains du patient vers le haut et loin du corps.</li>
	<li>Positionner la tête du patient en extension pour exposer le col.</li>
	<li>Numériser à partir du niveau du menton au niveau de l’articulation de la hanche pour couvrir les zones anatomiques du cou au bassin.</li>
	<li>Effectuer l’analyse d’une manière de zig-zag à travers le corps pour s’assurer que tous les domaines a été scanné.</li>
	<li>Scan tous les deux vers l’avant et vers l’arrière comme l’épaisseur du patient doit être prise en considération.</li>
	<li>Notez soigneusement le signal audiovisuel positif lors de la numérisation de la présence du GPRA.</li>
</ol>5. effectuer la radiographie pertinente
<ol><li>Commander la radiographie pertinente du cou, la poitrine ou l’abdomen, selon la zone détectée par la projection de DMOM pour le GPRA.</li>
	<li>Procéder à toutes les vues de rayons x (cou, thorax et abdomen) si le BMF n’a pas été décelé au cours de la projection de DMOM et l’indice clinique de suspicion pour ingestion de corps étranger est élevée.</li>
</ol>6. enregistrer les résultats des tests
<ol><li>Record les résultats des tests dans le journal de bord (Figure 2) créées spécifiquement basé sur le flux de travail (Figure 1).</li>
	<li>Corrélation entre le signal positif de la DMOM audiovisuels avec le point de repère osseux sous-jacent sur le corps, en palpant les suivant des repères osseux - encoche sternal, xiphisternum, symphyse pubienne et la crête iliaque bilatérale.</li>
	<li>Enregistrer le point de repère sur le contour de référence anatomique du journal de bord avant de procéder à l’examen aux rayons x.</li>
</ol>

<ol>
	<li>Lee, J., Ahmad, S., Gale, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Detection+of+coins+ingested+by+children+using+a+handheld+metal+detector:+a+systematic+review.">Detection of coins ingested by children using a handheld metal detector: a systematic review.</a> Emergency Medicine Journal. 22 (12), 839-844 (2005).</li><li>Hesham A-Kader, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Foreign+body+ingestion:+children+like+to+put+objects+in+their+mouth.">Foreign body ingestion: children like to put objects in their mouth.</a> World Journal of Pediatrics. 6 (4), 301-310 (2010).</li><li>Muensterer, O. 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P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ingested+foreign+bodies+in+the+paediatric+patient.">Ingested foreign bodies in the paediatric patient.</a> Irish Journal of Medical Science. 170 (2), 100-102 (2001).</li><li>Bassett, K. E., Schunk, J. E., Logan, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Localizing+ingested+coins+with+a+metal+detector.">Localizing ingested coins with a metal detector.</a> The American Journal of Emergency Medicine. 17 (4), 338-341 (1999).</li><li>Gooden, E. A., Forte, V., Papsin, B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Use+of+a+commercially+available+metal+detector+for+the+localization+of+metallic+foreign+body+ingestion+in+children.">Use of a commercially available metal detector for the localization of metallic foreign body ingestion in children.</a> The Journal of Otolaryngology. 29 (4), 218-220 (2000).</li><li>Sacchetti, A., Carraccio, C., Lichenstein, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Hand-held+metal+detector+identification+of+ingested+foreign+bodies.">Hand-held metal detector identification of ingested foreign bodies.</a> Pediatric Emergency Care. 10 (4), 204-207 (1994).</li><li>Hamzah, H. B., James, V., Manickam, S., Ganapathy, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Handheld+Metal+Detector+for+Metallic+Foreign+Body+Ingestion+in+Pediatric+Emergency.">Handheld Metal Detector for Metallic Foreign Body Ingestion in Pediatric Emergency.</a> Indian Journal of Pediatrics. 85 (8), 618-624 (2018).</li><li>Doraiswamy, N. V., Baig, H., Hallam, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Metal+detector+and+swallowed+metal+foreign+bodies+in+children.">Metal detector and swallowed metal foreign bodies in children.</a> Journal of Accident &amp; Emergency Medicine. 16 (2), 123-125 (1999).</li><li>Seikel, K., Primm, P. A., Elizondo, B. J., Remley, K. 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Les auteurs n’ont rien à divulguer.

Métallique étrangère ingestion de corps chez les enfants est un problème commun et dans la majorité des patients, c’est géré prudemment7,16. Les radiographies unique ou répétées peuvent exposer la population pédiatrique radiosensible risque de rayonnements non désirés tout en essayant de localiser les corps étrangers métalliques ingérés. Plusieurs études ont décrit l’utilisation de détecteurs de métaux à l’ingestion de MFB chez les enf...

Ingestion de corps étranger est un problème très répandu chez les enfants présentant au service d’urgence pédiatrique en raison de la nature naturel curieuse des nourrissons et des enfants à la découverte des objets en dégustation et en avalant les1,2. Des études antérieures ont signalé que des objets métalliques a constitué à 85 % de tous les ingestions de corps étranger dans leur cohorte de patients3,4. Ce protocole vise à évaluer l’exactitude et la possibilité d’utiliser un détecteur de métal portatif pour détecter des corps étrangers métalliques ingérés chez les enfants. Nous proposons qu’en introduisant le détecteur de métaux portatif protocole tôt dans le processus de triage des enfants avec une forte suspicion d’ingestion de corps étrangers métalliques de dépistage, le nombre des radiographies avoir reçu l’ordre de localiser les corps étrangers métalliques peuvent être réduit à cette population radiosensible.
Détecteur de métaux portatif (DMOM) est un complément peu coûteux, facile d’accès qui peut aider à accélérer la gestion des corps étrangers métalliques ingérés. Détecteur de métaux est un dispositif très basse fréquence, qui dispose d’un récepteur et un émetteur qui détecte le changement dans son champ électromagnétique causée par la présence d’un objet métallique dans ses environs3. Si un objet métallique dans le champ, le champ électromagnétique est perturbé et le capteur va déclencher une alarme audiovisuelle sur le dispositif4. L’examen de détecteur de métaux peut être soigneusement effectuée en moins de 2 minutes5. Par conséquent, la projection de DMOM peut être introduite tôt dans le processus de triage des enfants avec une forte suspicion d’ingestion de corps étrangers métalliques pour la localisation topographique.
Les pièces sont les plus courantes avalé les corps étrangers métalliques1,4,6,7. En raison de l’absence d’arêtes vives et non-toxique généralité, la majorité des ingestions de pièce est gérée avec prudence. D’autres types de matériaux ingérés communément incluent aimants, piles boutons, petits jouets, arachides, bijoux, boutons, OS, graines et popcorn8,9. Impaction des corps étrangers survient le plus souvent dans le œsophage dans trois sites, à savoir du sphincter oesophagien supérieur, Mid-oesophage au niveau de la crosse aortique et de sphincter oesophagien inférieur10. Les corps étrangers métalliques (GPRA) situés dans le œsophage peuvent être asymptomatiques dans 40 % des patients11,12 et son impaction prolongée peut conduire à des complications diverses comme la perforation oesophagienne, médiastinite, fistule trachéo-oesophagienne, sténose trachéale et fistules aorto-oesophagien1,13,14,15. Autres lieux d’impaction de corps étranger inclure pylore, duodénum et10de la jonction iléo-cæcal.
Effectuer des radiographies du cou, thorax et abdomen pour diagnostiquer soupçonnés d’ingestion de corps étrangers est une pratique très répandue dans les départements d’urgence5. Parmi tous les types des corps étrangers ingérés, seulement 10 % sont radio-opaques10. Les examens radiologiques sont coûteuses en temps et ont un risque d’exposition aux radiations chez les enfants. Une localisation topographique précise d’objets métalliques ingérés est très cruciale pour guider le traitement. L’introduction de DMOM dépistage tôt dans le processus de triage peut aider à atténuer étrangères ordonnant des radiographies en topographiquement localisant les corps étrangers métalliques ingérés.
Cette étude a évalué l’exactitude des DMOM pour localiser le GPRA de façon systématique topographique et déterminé l’efficacité et la faisabilité de DMOM dans la population pédiatrique. Nous avons également examiné comment bien ce rayonnement libre outil de dépistage a été accepté par les patients et les parents. Entre mai et juillet 2016, tous les patients consécutifs qui a présenté à l’urgence pédiatrique avec une histoire d’ingestion de corps étrangers ont participé à l’étude. Le consentement éclairé a été obtenu du parent ou tuteur légal. Les patients avec l’ingestion de corps étrangers présumés ont été systématiquement numérisés dans DMOM. L’étalon-or des soins pour l’identification et la localisation des corps étrangers métalliques ingérés effectue des radiographies simples de la zone cervicale, thorax et abdomen. Afin de faciliter la réalisation de l’étude, un flux de travail normalisé a été créé (Figure 1). Un journal de bord spécialement créé à partir du flux de travail a permis de recueillir les données initiales, qui ont été transcrits par la suite dans une feuille de calcul (Figure 2). Les données dans la section de résultat sont dépeints comme le nombre de cas, suivie de pourcentages.

<table>
	<tbody>
		<tr>
			<td>Hand held metal detector</td>
			<td>Garrett Super Scanner V</td>
			<td>NA</td>
			<td>NA</td>
		</tr>
	</tbody>
</table>

handheld metal detector screening for metallic foreign body ingestion in children

Pièces de monnaie sont les corps étrangers métalliques ingérés plus courantes chez les enfants. Ce protocole vise à évaluer l’exactitude et la possibilité d’utiliser un détecteur de métal portatif pour détecter des corps étrangers métalliques ingérés chez les enfants. Nous proposons qu’en introduisant le dépistage de détecteur de métaux portatif tôt dans le processus de triage des enfants avec une forte suspicion d’ingestion de corps étrangers métalliques, le nombre de radiographies, avoir reçu l’ordre de localiser les corps étrangers métalliques peut être réduit dans ce radio-sensible à la population. Le protocole de l’étude nécessite l’examen préalable des participants de l’histoire de l’ingestion de corps étrangers et l’exclusion des personnes souffrant de détresse respiratoire ou implants métalliques. Le patient passe à la chemise d’hôpital et les éléments qui pourraient contenir du métal comme lunettes, boucles d’oreilles, pendentifs et ornements sont supprimés. Le patient est placé dans le centre de la pièce loin d’autres interférences métalliques. L’état de fonctionnement du détecteur de métal portatif est tout d’abord confirmé en suscitant un signal audiovisuel positif. Ensuite la sélection se fait dans une posture droite avec la tête en extension pour exposer au cou, au niveau du menton au niveau de l’articulation de la hanche, pour couvrir les zones anatomiques du cou au bassin de façon zig-zag tant vers l’avant et vers l’arrière. Un signal audiovisuel positif est soigneusement noté lors de la numérisation de la présence de corps étrangers métalliques. Les radiographies sont classés selon la zone détectée sur la projection de détecteur de métaux. Le détecteur de métaux portatif a été en mesure d’identifier avec précision toutes les pièces parmi les corps étrangers métalliques ingérés dans notre étude. Le détecteur de métaux portatif n’a pas pu toujours détecter non-pièce corps étrangers métalliques. Ce protocole montre l’exactitude du détecteur de métaux portatif à l’identification et la localisation des pièces et des pièces comme des corps étrangers métalliques.

Les chercheurs ont recrutement 36 patients pour cette étude observationnelle. Ces patients ont présenté au service des urgences pédiatrique avec une histoire d’ingestion de corps étrangers. Parmi celles-ci, 28 patients ont eu ingestion de corps étranger métallique (Figure 3). Les 8 autres patients avaient ingéré des corps étrangers non métalliques tels que les arêtes de poisson, bâton de satay et bouton en plastique. Pièces de monnaie sont le ...

Watch this Scientific Journal Video about Handheld Metal Detector Screening for Metallic Foreign Body Ingestion in Children at JoVE.com

Handheld Metal Detector Screening for Metallic Foreign Body Ingestion in Children

Nous présentons ici un protocole pour utiliser le détecteur de métaux portatif, pour dépister la présence des corps étrangers métalliques ingérés chez les enfants qui présentent pour le département de médecine d’urgence pédiatrique et ayant des antécédents d’ingestion de corps étrangers.

Détecteur de métaux portatif de dépistage pour l’Ingestion de corps étrangers métalliques chez les enfants

Coins are the most common ingested metallic foreign bodies among children. The goal of this protocol is to assess the accuracy and feasibility of using a ...

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10.6K vues.  KK women's and Children's Hospital. Nous présentons ici un protocole pour utiliser le détecteur de métaux portatif, pour dépister la présence des corps étrangers métalliques ingérés chez les enfants qui présentent pour le département de médecine d’urgence pédiatrique et ayant des antécédents d’ingestion de corps étrangers.

Vidéo: Handheld Metal Detector Screening for Metallic Foreign Body Ingestion in Children

High Content Screening in Neurodegenerative Diseases

The functional annotation of genomes, construction of molecular networks and novel drug target identification, are important challenges that need to be addressed as a matter of great urgency1-4. Multiple complementary 'omics' approaches have provided clues as to the genetic risk factors and pathogenic mechanisms underlying numerous neurodegenerative diseases, but most findings still require functional validation5. For example, a recent genome wide association study for Parkinson's Disease (PD), identified many new loci as risk factors for the disease, but the underlying causative variant(s) or pathogenic mechanism is not known6, 7. As each associated region can contain several genes, the functional evaluation of each of the genes on phenotypes associated with the disease, using traditional cell biology techniques would take too long. 
	There is also a need to understand the molecular networks that link genetic mutations to the phenotypes they cause. It is expected that disease phenotypes are the result of multiple interactions that have been disrupted. Reconstruction of these networks using traditional molecular methods would be time consuming. Moreover, network predictions from independent studies of individual components, the reductionism approach, will probably underestimate the network complexity8. This underestimation could, in part, explain the low success rate of drug approval due to undesirable or toxic side effects. Gaining a network perspective of disease related pathways using HT/HC cellular screening approaches, and identifying key nodes within these pathways, could lead to the identification of targets that are more suited for therapeutic intervention.
	High-throughput screening (HTS) is an ideal methodology to address these issues9-12. but traditional methods were one dimensional whole-well cell assays, that used simplistic readouts for complex biological processes. They were unable to simultaneously quantify the many phenotypes observed in neurodegenerative diseases such as axonal transport deficits or alterations in morphology properties13, 14. This approach could not be used to investigate the dynamic nature of cellular processes or pathogenic events that occur in a subset of cells. To quantify such features one has to move to multi-dimensional phenotypes termed high-content screening (HCS)4, 15-17. HCS is the cell-based quantification of several processes simultaneously, which provides a more detailed representation of the cellular response to various perturbations compared to HTS. 
	HCS has many advantages over HTS18, 19, but conducting a high-throughput (HT)-high-content (HC) screen in neuronal models is problematic due to high cost, environmental variation and human error. In order to detect cellular responses on a 'phenomics' scale using HC imaging one has to reduce variation and error, while increasing sensitivity and reproducibility. 
	Herein we describe a method to accurately and reliably conduct shRNA screens using automated cell culturing20 and HC imaging in neuronal cellular models. We describe how we have used this methodology to identify modulators for one particular protein, DJ1, which when mutated causes autosomal recessive parkinsonism21. 
	Combining the versatility of HC imaging with HT methods, it is possible to accurately quantify a plethora of phenotypes. This could subsequently be utilized to advance our understanding of the genome, the pathways involved in disease pathogenesis as well as identify potential therapeutic targets.

We describe a methodology combining automated cell culturing with high-content imaging to visualize and quantify multiple cellular processes and structures, in a high-throughput manner. Such methods can aid in the further functional annotation of genomes as well as identify disease gene networks and potential drug targets.

Dépistage du contenu haute sur les maladies neurodégénératives

The functional annotation of genomes, construction of molecular networks and novel drug target identification, are important challenges that need to be ...

Recherche

Médecine

Eye Tracking Young Children with Autism

The rise of accessible commercial eye-tracking systems has fueled a rapid increase in their use in psychological and psychiatric research. By providing a direct, detailed and objective measure of gaze behavior, eye-tracking has become a valuable tool for examining abnormal perceptual strategies in clinical populations and has been used to identify disorder-specific characteristics1, promote early identification2, and inform treatment3. In particular, investigators of autism spectrum disorders (ASD) have benefited from integrating eye-tracking into their research paradigms4-7. Eye-tracking has largely been used in these studies to reveal mechanisms underlying impaired task performance8 and abnormal brain functioning9, particularly during the processing of social information1,10-11. While older children and adults with ASD comprise the preponderance of research in this area, eye-tracking may be especially useful for studying young children with the disorder as it offers a non-invasive tool for assessing and quantifying early-emerging developmental abnormalities2,12-13. Implementing eye-tracking with young children with ASD, however, is associated with a number of unique challenges, including issues with compliant behavior resulting from specific task demands and disorder-related psychosocial considerations. In this protocol, we detail methodological considerations for optimizing research design, data acquisition and psychometric analysis while eye-tracking young children with ASD. The provided recommendations are also designed to be more broadly applicable for eye-tracking children with other developmental disabilities. By offering guidelines for best practices in these areas based upon lessons derived from our own work, we hope to help other investigators make sound research design and analysis choices while avoiding common pitfalls that can compromise data acquisition while eye-tracking young children with ASD or other developmental difficulties.

Eye tracking has long been used to study gaze patterns in typically-developing individuals, but recent technological advancements have made its use with clinical populations, including autism, more feasible. While eye-tracking young children with autism can offer insight into early symptom manifestations, it involves methodological challenges. Suggestions for best practices are provided.

Eye Tracking jeunes enfants autistes

The rise of accessible commercial eye-tracking systems has fueled a rapid increase in their use in psychological and psychiatric research. By providing a ...

Protocol for Long Duration Whole Body Hyperthermia in Mice

Hyperthermia is a general term used to define the increase in core body temperature above normal. It is often used to describe the increased core body temperature that is observed during fever. The use of hyperthermia as an adjuvant has emerged as a promising procedure for tumor regression in the field of cancer biology. For this purpose, the most important requirement is to have reliable and uniform heating protocols. We have developed a protocol for hyperthermia (whole body) in mice. In this protocol, animals are exposed to cycles of hyperthermia for 90 min followed by a rest period of 15 min. During this period mice have easy access to food and water. High body temperature spikes in the mice during first few hyperthermia exposure cycles are prevented by immobilizing the animal. Additionally, normal saline is administered in first few cycles to minimize the effects of dehydration. This protocol can simulate fever like conditions in mice up to 12-24 hr. We have used 8-12 weeks old BALB/Cj female mice to demonstrate the protocol.

This paper describes a protocol for whole body hyperthermia in mice that can stimulate fever like conditions up to 12-24 hr.

Protocole d&#39;hyperthermie Durée du corps entier long chez la souris

Hyperthermia is a general term used to define the increase in core body temperature above normal. It is often used to describe the increased core body ...

Measuring Cardiac Autonomic Nervous System (ANS) Activity in Children

The autonomic nervous system (ANS) controls mainly automatic bodily functions that are engaged in homeostasis, like heart rate, digestion, respiratory rate, salivation, perspiration and renal function. The ANS has two main branches: the sympathetic nervous system, preparing the human body for action in times of danger and stress, and the parasympathetic nervous system, which regulates the resting state of the body.
ANS activity can be measured invasively, for instance by radiotracer techniques or microelectrode recording from superficial nerves, or it can be measured non-invasively by using changes in an organ's response as a proxy for changes in ANS activity, for instance of the sweat glands or the heart. Invasive measurements have the highest validity but are very poorly feasible in large scale samples where non-invasive measures are the preferred approach. Autonomic effects on the heart can be reliably quantified by the recording of the electrocardiogram (ECG) in combination with the impedance cardiogram (ICG), which reflects the changes in thorax impedance in response to respiration and the ejection of blood from the ventricle into the aorta. From the respiration and ECG signals, respiratory sinus arrhythmia can be extracted as a measure of cardiac parasympathetic control. From the ECG and the left ventricular ejection signals, the preejection period can be extracted as a measure of cardiac sympathetic control. ECG and ICG recording is mostly done in laboratory settings. However, having the subjects report to a laboratory greatly reduces ecological validity, is not always doable in large scale epidemiological studies, and can be intimidating for young children. An ambulatory device for ECG and ICG simultaneously resolves these three problems.
Here, we present a study design for a minimally invasive and rapid assessment of cardiac autonomic control in children, using a validated ambulatory device 1-5, the VU University Ambulatory Monitoring System (VU-AMS, Amsterdam, the Netherlands,<a href="http://www.vu-ams.nl" target="_blank"> www.vu-ams.nl</a>).

Measuring Cardiac Autonomic Nervous System ANS Activity in Children

Measurement of autonomic nervous system activity usually confines the researcher and participant to the laboratory, which may provide an intimidating environment to children. The VU University Ambulatory Monitoring System (VU-AMS) device can record cardiac autonomic control in any setting. The VU-AMS proved very amenable to testing in children.

Système de mesure (ANS) Activité Nervous Autonomic Cardiac in Children

The autonomic nervous system (ANS) controls mainly automatic bodily functions that are engaged in homeostasis, like heart rate, digestion, respiratory ...

Screening for Melanoma Modifiers using a Zebrafish Autochthonous Tumor Model

Genomic studies of human cancers have yielded a wealth of information about genes that are altered in tumors1,2,3. A challenge arising from these studies is that many genes are altered, and it can be difficult to distinguish genetic alterations that drove tumorigenesis from that those arose incidentally during transformation. To draw this distinction it is beneficial to have an assay that can quantitatively measure the effect of an altered gene on tumor initiation and other processes that enable tumors to persist and disseminate. Here we present a rapid means to screen large numbers of candidate melanoma modifiers in zebrafish using an autochthonous tumor model4 that encompasses steps required for melanoma initiation and maintenance. A key reagent in this assay is the miniCoopR vector, which couples a wild-type copy of the mitfa melanocyte specification factor to a Gateway recombination cassette into which candidate melanoma genes can be recombined5. The miniCoopR vector has a mitfa rescuing minigene which contains the promoter, open reading frame and 3'-untranslated region of the wild-type mitfa gene. It allows us to make constructs using full-length open reading frames of candidate melanoma modifiers. These individual clones can then be injected into single cell Tg(mitfa:BRAFV600E);p53(lf);mitfa(lf)zebrafish embryos. The miniCoopR vector gets integrated by Tol2-mediated transgenesis6 and rescues melanocytes. Because they are physically coupled to the mitfa rescuing minigene, candidate genes are expressed in rescued melanocytes, some of which will transform and develop into tumors. The effect of a candidate gene on melanoma initiation and melanoma cell properties can be measured using melanoma-free survival curves, invasion assays, antibody staining and transplantation assays.

A rapid way to screen for melanoma modifiers using a zebrafish autochthonous tumor model is presented. It takes advantage of the miniCoopR vector which allows for expression of candidate melanoma genes in melanocytes. A method to obtain melanoma-free survival curves, an invasion assay, a protocol for antibody staining of scale melanocytes and a melanoma transplantation assay are described.

Dépistage du mélanome Modificateurs l&#39;aide d&#39;un modèle de tumeur Zebrafish Autochtone

Genomic studies of  human cancers have yielded a wealth of information about genes that are altered  in tumors1,2,3. A challenge arising from these ...

A Novel High-resolution In vivo Imaging Technique to Study the Dynamic Response of Intracranial Structures to Tumor Growth and Therapeutics

We have successfully integrated previously established Intracranial window (ICW) technology 1-4 with intravital 2-photon confocal microscopy to develop a novel platform that allows for direct long-term visualization of tissue structure changes intracranially. Imaging at a single cell resolution in a real-time fashion provides supplementary dynamic information beyond that provided by standard end-point histological analysis, which looks solely at 'snap-shot' cross sections of tissue.
Establishing this intravital imaging technique in fluorescent chimeric mice, we are able to image four fluorescent channels simultaneously. By incorporating fluorescently labeled cells, such as GFP+ bone marrow, it is possible to track the fate of these cells studying their long-term migration, integration and differentiation within tissue. Further integration of a secondary reporter cell, such as an mCherry glioma tumor line, allows for characterization of cell:cell interactions. Structural changes in the tissue microenvironment can be highlighted through the addition of intra-vital dyes and antibodies, for example CD31 tagged antibodies and Dextran molecules.
Moreover, we describe the combination of our ICW imaging model with a small animal micro-irradiator that provides stereotactic irradiation, creating a platform through which the dynamic tissue changes that occur following the administration of ionizing irradiation can be assessed.
Current limitations of our model include penetrance of the microscope, which is limited to a depth of up to 900 &mu;m from the sub cortical surface, limiting imaging to the dorsal axis of the brain. The presence of the skull bone makes the ICW a more challenging technical procedure, compared to the more established and utilized chamber models currently used to study mammary tissue and fat pads 5-7. In addition, the ICW provides many challenges when optimizing the imaging.

A Novel High-resolution In vivo Imaging Technique to Study the Dynamic Response of Intracranial Structures to Tumor Growth and Therapeutics

We describe a novel in vivo imaging technique that couples fluorescent chimeric mice with intracranial windows and high-resolution 2-photon microscopy. This imaging platform aids studies of dynamic changes in brain tissue and microvasculature, at a single-cell level, following pathological insults and is adaptable to assess intracranial drug delivery and distribution.

A Novel haute résolution<em&gt; In vivo</em&gt; Technique d&#39;imagerie pour étudier la réponse dynamique des structures intracrâniennes à la croissance tumorale et de thérapeutique

We have successfully integrated previously established Intracranial window (ICW) technology 1-4 with intravital 2-photon confocal microscopy to develop a ...

A Novel in vivo Gene Transfer Technique and in vitro Cell Based Assays for the Study of Bone Loss in Musculoskeletal Disorders

Differentiation and activation of osteoclasts play a key role in the development of musculoskeletal diseases as these cells are primarily involved in bone resorption. Osteoclasts can be generated in vitro from monocyte/macrophage precursor cells in the presence of certain cytokines, which promote survival and differentiation. Here, both in vivo and in vitro techniques are demonstrated, which allow scientists to study different cytokine contributions towards osteoclast differentiation, signaling, and activation. The minicircle DNA delivery gene transfer system provides an alternative method to establish an osteoporosis-related model is particularly useful to study the efficacy of various pharmacological inhibitors in vivo. Similarly, in vitro culturing protocols for producing osteoclasts from human precursor cells in the presence of specific cytokines enables scientists to study osteoclastogenesis in human cells for translational applications. Combined, these techniques have the potential to accelerate drug discovery efforts for osteoclast-specific targeted therapeutics, which may benefit millions of osteoporosis and arthritis patients worldwide.

A Novel in vivo Gene Transfer Technique and in vitro Cell Based Assays for the Study of Bone Loss in Musculoskeletal Disorders

Differentiation of precursor cells into osteoclasts is regulated by cytokines and growth factors. Here, a novel gene transfer technique for differentiation of osteoclasts in vivo and cell culture protocols for differentiating precursor cells into osteoclasts in vitro as a method to study the effects of cytokines on osteoclastogenesis are described.

A Novel<em&gt; In vivo</em&gt; Technique Gene Transfer et<em&gt; In vitro</em&gt; Essais cellule sur la base de l&#39;étude de la perte osseuse dans les troubles musculo-squelettiques

Differentiation and activation of osteoclasts play a key role in the development of musculoskeletal diseases as these cells are primarily involved in bone ...

Normothermic Ex Vivo Kidney Perfusion for the Preservation of Kidney Grafts prior to Transplantation

Kidney transplantation has become a well-established treatment option for patients with end-stage renal failure. The persisting organ shortage remains a serious problem. Therefore, the acceptance criteria for organ donors have been extended leading to the usage of marginal kidney grafts. These marginal organs tolerate cold storage poorly resulting in increased preservation injury and higher rates of delayed graft function. To overcome the limitations of cold storage, extensive research is focused on alternative normothermic preservation methods.
Ex vivo normothermic organ perfusion is an innovative preservation technique. The first experimental and clinical trials for ex vivo lung, liver, and kidney perfusions demonstrated favorable outcomes.
In addition to the reduction of cold ischemic injury, the method of normothermic kidney storage offers the opportunity for organ assessment and repair. This manuscript provides information about kidney retrieval, organ preservation techniques, and isolated ex vivo normothermic kidney perfusion (NEVKP) in a porcine model. Surgical techniques, set up for the perfusion solution and the circuit, potential assessment options, and representative results are demonstrated.

Normothermic Ex Vivo Kidney Perfusion for the Preservation of Kidney Grafts prior to Transplantation

The severe organ shortage has resulted in increased use of marginal kidney grafts for transplantation. This has triggered interest in alternative storage methods, since marginal grafts especially tolerate cold storage poorly. The technique of normothermic ex vivo kidney perfusion (NEVKP) represents a novel preservation method for kidney grafts prior to &#160;transplantation.

Normothermique<em&gt; Ex Vivo</em&gt; Kidney Perfusion pour la préservation du rein Greffes avant la transplantation

Kidney transplantation has become a well-established treatment option for patients with end-stage renal failure. The persisting organ shortage remains a ...

Heterotopic Renal Autotransplantation in a Porcine Model: A Step-by-Step Protocol

Kidney transplantation is the treatment of choice for patients suffering from end-stage renal disease. It offers better life expectancy and higher quality of life when compared to dialysis. Although the last few decades have seen major improvements in patient outcomes following kidney transplantation, the increasing shortage of available organs represents a severe problem worldwide. To expand the donor pool, marginal kidney grafts recovered from extended criteria donors (ECD) or donated after circulatory death (DCD) are now accepted for transplantation. To further improve the postoperative outcome of these marginal grafts, research must focus on new therapeutic approaches such as alternative preservation techniques, immunomodulation, gene transfer, and stem cell administration.
Experimental studies in animal models are the final step before newly developed techniques can be translated into clinical practice. Porcine kidney transplantation is an excellent model of human transplantation and allows investigation of novel approaches. The major advantage of the porcine model is its anatomical and physiological similarity to the human body, which facilitates the rapid translation of new findings to clinical trials. This article offers a surgical step-by-step protocol for an autotransplantation model and highlights key factors to ensure experimental success. Adequate pre- and postoperative housing, attentive anesthesia, and consistent surgical techniques result in favorable postoperative outcomes. Resection of the contralateral native kidney provides the opportunity to assess post-transplant graft function. The placement of venous and urinary catheters and the use of metabolic cages allow further detailed evaluation. For long-term follow-up studies and investigation of alternative graft preservation techniques, autotransplantation models are superior to allotransplantation models, as they avoid the confounding bias posed by rejection and immunosuppressive medication.

Porcine models of organ transplantation provide an important platform to study mechanisms of organ preservation. This article describes a heterotopic porcine renal autotransplantation model, which allows investigating new approaches to improve the outcome of transplantation using marginal kidney grafts.

Hétérotopique rénale Autotransplantation dans un modèle porcin: Un protocole Step-by-Step

Kidney transplantation is the treatment of choice for patients suffering from end-stage renal disease. It offers better life expectancy and higher quality ...

Nerve-sparing Mid-urethral Obstruction (NeMO) in Female Small Rodents

Partial bladder outlet obstruction (pBOO) has a high prevalence, causes significant patient burden, and immense health care costs. The most common animal model to investigate bladder remodeling in pBOO are female rodents undergoing partial obstruction at the proximal urethra. Variability in the degree of obstruction and animal mortality are major concerns with proximal obstruction. Furthermore, dissecting around the proximal urethra and bladder neck jeopardizes bladder innervation.
We developed a nerve-sparing mid-urethral obstruction (NeMO) model for pBOO avoiding the disadvantages of the traditional model. We approached the urethra just inferior to the pubic symphysis, which obviated the need for laparotomy as well as for dissection in this area; also, the striated urethral sphincter remained untouched. We performed NeMO in female Sprague-Dawley rats (12 obstructions, 6 sham animals) as well as in female C57/bl6 mice (20 obstructions, 18 sham animals). After two weeks, we evaluated bladder function, bladder mass, and body mass.
We had no mortalities among obstructed- or sham-operated female rats; as described for the traditional proximal pBOO-method, we tied the suture around the proximal urethra and a temporarily placed 0.9 mm metal rod. NeMO induced an 85% increase in bladder mass after two weeks, average residual urine volume was 0.4 mL in partially obstructed rats while only 0.03 mL in sham animals. In mice, we tested 3 sizes of cannulas that we placed along the urethra when tying the suture. We found that using a 27-gauge cannula resulted in over 50% animal mortality; placing the 25-gauge cannula did not yield the desired response in increasing bladder mass; utilizing a 26-gauge cannula yielded favorable results with minimal animal mortality (1/8) yet a significant 2-fold increase in bladder mass.

Nerve-sparing Mid-urethral Obstruction NeMO in Female Small Rodents

Traditional modeling of partial bladder outlet obstruction in rodents is fraught with animal mortality. A denervation injury from dissection around the proximal urethra and bladder neck is also of major concern. We developed and evaluated a safe and reliable mid-urethral obstruction model, avoiding the shortcomings of the traditional model.

Préservation des nerfs Obstruction à mi-urétrale (NEMO) chez les femelles petits rongeurs

Partial bladder outlet obstruction (pBOO) has a high prevalence, causes significant patient burden, and immense health care costs. The most common animal ...