We thank Drs. Xiaofang Wang and Katharina Hopp for their invaluable help with the animal models. This work has been supported by grants from the National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health (DK090728, DK058816).

Canlı hayvan ile herhangi prosedürleri başlamadan önce, deney protokolleri kurumsal hayvan bakımı ve kullanımı komitesi (IACUC) tarafından onaylanmış olması gerekir. 1. Tarayıcı Yapılandırması <ol><li> Başlamadan önce, ısıtıcı KAPALI konumda olduğundan emin olun. </li><li> Mini görüntüleme degrade ve 38 mm RF bobini mini görüntüleme tutucu seçin. </li><li> Sahibinin merkez deliğinde değişken sıcaklık düzeneğini takın. </li></ol> 2. Hayvan hazırlanması <ol><li> MR deneyler için, buharlaşmış izofluran kullanarak optimum anestezi elde. Anestezinin indüksiyonu için, bir emici doku ile kaplı bir indüksiyon odasında hayvan. 2.0-2.5 L / dk ve oksijen% 3 izofluran izofluran buharlaştırıcı debi ölçer ayarlayın. </li><li> Bu aşamada herhangi bir metal etiketi veya diğer metalik nesneyi kaldırın. Anestezi altında iken kuruluğunu önlemek için hayvanın gözleri veteriner merhem sürün. </li><li> Hayvan kezanestezi, cerrahi düzlemine ulaşmıştır (yani, ayak tutam çekilme refleks kaybı), bir burun konisi içine yerleştirilir onun burunlu bir tutucuya hayvan yerleştirin. 2.0-2.5 ml / dk soruşturmada anestezi hava akımını ve oksijen 1.5-2.0% izofluran konsantrasyonu ayarlayın. Anestezi işlemi sırasında burun konisi ile teslim edilecektir. Periyodik 40 bpm ~ bir solunum hızını korumak için hayvanın yaşına ve ağırlığına bağlı olarak izofluran konsantrasyonu ayarlayın. </li><li> Yerine hayvan sabitlemek ve MRG deney sırasında hareket etmesini önlemek için hayvan sahiplerine kullanın. Vücut bölgesine bağlı olarak hayvan sahibinin tipi taranacak Vary. Not: Laboratuvar plastik (polipropilen, Teflon, polistren, polikarbonat) den Özelleştirilmiş sahipleri belirli deney karşılamak ve (160 gr sıçan yenidoğan fareden) hayvan boyutuna uyacak şekilde yapılabilir. </li><li> Hayvanın vücut sıcaklığını izlemek için hayvanda rektal termometre yerleştirin. Exp sırasındaeriment, bir sıcak hava akımı kullanılarak, 35-37 ° C&#39;de hayvan tutun. Hava sıcaklığı (30-38 ° C) ve hayvanın vücut ısısı yorumlarına dayanarak akışı (1,200-2,000 L / saat) ayarlayın. </li><li> Solunum hızını izlemek için hayvanın karın bir balon solunum basınç sensörü takın. </li><li> RF bobini merkezinde hayvan Güvenli ve dikkatli MRI tarayıcısı içine hayvan ile RF bobin yerleştirin. </li></ol> 3. MR Deney <ol><li> Ayarlama deneyleri RF gücü kullanılan en aza indirmek için ve sinyal-gürültü oranının en üst düzeye çıkarmak için başlamadan önce RF bobini maç ve. Eşleştirme / ayarlamayı başlatmak için: <ol><li> Araçlar simgesini tıklatarak spektrometre kontrol aracını açın. </li><li> Spektrometre kontrol aracı olarak Acquisition → yalpalama tıklatın. Bir Edi / Reco penceresi yalpalama eğrisi görüntüleyen açılacaktır. </li><li> Alternatif yansıyan RF gücü kadar küçük adımlarla ayarlama ve eşleştirme kapasitörler (çubuklar ayar kullanarak ve eşleştirme) ayarlamaken aza indirilir. amaç yatay eksende sıfır konumlandırılmış dikey eksende minimum bir eğri görmektir. </li><li> Bobinin kalibrasyon başarıyla elde edildiğinde, Edi / Reco penceresindeki Durdur düğmesine basın. </li></ol></li><li> Eksenel koronal ve sagital görüntüler oluşturmak için üç ortogonal düzlemde izci görüntü elde. Izci görüntüler elde etmek için 12 gibi içi Kapısı Hızlı Düşük Açılı Çekim (IG-FLASH) gibi hızlı görüntü dizisi kullanın. Gerçek görüntüleme için uygun geometriyi ayarlamak için keşif görüntüleri kullanın. </li><li> Özel araştırma amaçlarına bağlı olarak, uygun görüntü dizisi ve parametreleri seçin ve bir trafik ışığı ile tarama başlatın. Bu, tüm otomatik, RF kanalı kalibre su üzerinde rezonans mıknatıs, set taşıyıcı frekansı şim ve alıcı kazancı ayarlar. <ol><li> Anatomik çalışmalar ve T2 ağırlıklı görüntülerde, 2B çoklu dilim veya 3D modunda kazanır. Alan tutmak, belirli bir uzamsal çözünürlük için deney süresini kısaltmak için-Tabii-view (FOV) mümkün ama wrap-around eserler (2,56-3,2 cm) önlemek için yeterince büyük olduğu kadar küçük. </li></ol></li><li> Tekrarlama süresi (TR) ve / veya dilim sayısı uygun bir şekilde seçilmesi ile, hayvan respirasyon döngüsü biraz daha kısa seçilen sekansın döngüsü tutun. Bu veriler hayvanların sessiz dönemde tahsil edilmesini sağlar. <ol><li> Örneğin, karın görüntüler için, ~ 30 bpm hayvanın solunum hızı tutmak; Bu nefes başına yaklaşık 2,000 milisaniye olduğunu. TR, Dinlenme Geliştirme (NADİR) dizisi ile Turbo Hızlı Toplama kullanın ve 11-19 koronal dilim elde / TE 1500/9 msn, NADİR faktör 8 ve (matris 256 x 256, FOV 2.56 x 2.56 cm, dilim kalınlığı 0.75 mm) . Not: 1500 msn TR ayarlayarak ve ~ 30 bpm (nefes başına 2,000 msn) hayvanın solunum hızı tutarak, biz veri hayvanların sessiz dönemde toplanan emin olun. </li></ol></li><li> Tüm görüntü elde etme tamamlandıktan sonra, taranan hayvan koyunve ısıtmalı pad üzerinde ayaktan kadar izler. İyileştikten sonra, kafesine hayvan dönün ve hayvan tesis dönmeden önce 1 saat en az izlenen. </li></ol>

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The authors have nothing to disclose.

Bu yazıda, in vivo fenotipik karakterizasyonu veya PKD için kemirgen modellerinde ilaç izleme için bir araç olarak UHF MRI kullanılarak fizibilitesini göstermektedir. Biz geniş bir delik mikro ve küçük görüntüleme aksesuarlarla donatılmış Avance III yüksek çözünürlüklü NMR spektrometre ile 16.4 T yapılan deneyler açıklar. spektrometre Paravision 5.1 görüntüleme yazılımı tarafından kontrol TopSpin2.0PV toplama ve işleme yazılımı tarafından tahri...

Polikistik Böbrek Hastalığı (PKD), böbrek kist gelişimi ile karakterize tek gen hastalıkları grubunu içerir. Aralarında Otozomal dominant polikistik böbrek hastalığı (ADPKD) ve otozomal resesif polikistik böbrek hastalığı en yaygın türleri 1,2 temsil (ORPBH) bulunmaktadır. Polikistik böbrek, kalıtsal böbrek kistik hastalıkların en sık görülen formu, PKD1 veya PKD2 genlerindeki mutasyonlarla kaynaklanmaktadır. Geç başlangıçlı, birden iki taraflı böbrek kistleri, değişken ekstra renal kistler eşlik yanı sıra kardiyovasküler ve kas iskelet anomalileri ile karakterizedir. ORPBH, en sık etkileyen yenidoğan ve küçük çocuklar, PKHD1 mutasyonlar neden olur ve genişlemiş ekojenik böbrek ve konjenital hepatik fibrozis, 3 ile karakterizedir. Önemli bir şekilde, polikistik böbrek hem büyük p sonuçlanan bir genin (gen) ve mutasyon (alelik) seviyesi, en heterojenlik ile karakterize edilirhenotypic değişkenliği. PKD1 genindeki mutasyonlar ağır klinik tablo (sayısız kistler, erken tanı, hipertansiyon ve hematüri) yanı sıra, (PKD2 mutasyonları olan hastalardan daha 20 yıl önce) böbrek hastalığı son dönem hızla ilerlemesi ile ilişkili 4. Ağır polikistik karaciğer hastalığı (PLD) ve vasküler anormallikler PKD1 ve PKD2 5, her iki mutasyon ile ilişkili olabilir. bu hastalığın renal komplikasyonlara çoğunluğu ilişkili enflamasyon ve fibroz ile birlikte kist genişleme bir sonucu olarak özellikle ortaya çıkmaktadır. Kist geliştirme intrauterin başlar ve hasta ömür boyu devam eder. Böbrekler genellikle 20&#39;den fazla kez normal böbrek hacmi ulaşabilir bile onların reniform şeklini korumak. Böbrek kistlerinin hastalar mevcut ikili dağıtım çoğu, ancak bazı sıradışı durumlarda, kist tek taraflı veya asimetrik desen gelişebilir. Önemli bir Challennefrologlar Otozomal dominant polikistik böbrek hastaları takip veya tedaviler uygulanması için ge hastalığın doğal seyri olduğunu. Onun en tabii sırasında böbrek fonksiyonları normale kalır ve böbrek fonksiyonu azalmaya başlar zaman, böbrekler çoğu kistler almıştır. Terapiler sonraki aşamalarda uygulandığında, hastanın zaten kronik böbrek hastalığında geri dönüşü olmayan bir noktaya ulaşmış olabilir çünkü başarılı olmak için daha az olasıdır. Tedavi, erken aşamalarında başlatılan Aksine, bu sadece glomerüler filtrasyon hızı dayanan bir tepki tespit etmek güçtür. Bunun bir sonucu olarak, hastalık ilerlemesinin bir göstergesi olarak, böbrek hacminin kavramı dikkat çekti. Otozomal dominant polikistik böbrek hastalarında böbrek ve kist hacmindeki artış, doğrudan olarak toplam Böbrek Hacim (TKV) potansiyelini vurgulayan, böbrek fonksiyon bozukluğu ile ilişkili olduğunu Polikistik Böbrek Hastalığı (CRISP) Çalışmanın Radyolojik Görüntüleme Çalışmaları Konsorsiyumu göstermiştirhastalığın ilerlemesi 6,7 için urrogate işaretleyici. Sonuç olarak, şu anda TKV ADPKD 2,8,9 çoklu klinik çalışmalarda birincil ya da ikincil bir son nokta olarak kullanılır. Birden fare modelleri de dahil olmak üzere spontan mutasyonlar ve genetik olarak PKD 10,11 patogenezinde ışık tutmuştur. PKD1 veya PKD2 modelleri (PKD1 veya PKD2 ya mutasyonlar), onlar mükemmel taklit insan hastalığı en popüler olanları haline gelmiştir. Buna ek olarak, PKD1 ya PKD2 genler dışında genlerdeki mutasyonlarla kemirgen modelleri hastalığı ile ilişkili sinyal yollarının aydınlatmak için deneysel bir platform olarak kullanılmıştır. Buna ek olarak, bu modellerin muhtelif tedaviler test etmek için kullanılmıştır. Ancak, PKD birçok kemirgen çalışmalarında bir sınırlayıcı faktör sırasıyla böbrek anatomik ve fonksiyonel değişiklikleri analiz etmek için etkili non-invaziv yöntemlerin eksikliği genellikle. Manyetik resonance görüntüleme (MRG) mükemmel yumuşak doku kontrastı ve anatomik detay sağlayan ve TKV ölçümleri sağlayan ADPKD hastaları takip etmek Geçerli altın standart görüntüleme tekniğidir. MRG de in vivo olarak büyük hayvan ve insanlarda, görüntüleme küçük kemirgenler anatomik görüntüleme için kurulmuş olsa bile yüksek çözünürlüklü görüntüleri elde etmek için yeteneği yararlılığını kısıtlayabilir ek teknik zorlukları, gerektirir. Ultra yüksek alan (UHF) MR (7-16,4 T) ve daha güçlü geçişlerini gelişimi tanıtımı ile, benzer gürültü oranları ve teşhis kalitesi ile MR görüntülerinin mekansal çözünürlükte sinyal yüksek ulaşmak artık mümkün insanlarda elde edilmiştir. Sonuç olarak, PKD küçük kemirgen modellerinde in vivo görüntüleme için UHF MRI kullanımı araştırmacılar için güçlü bir araç haline gelmiştir.

<table border="0" cellpadding="0" cellspacing="0">
	<tbody>
		<tr>
			<td>AVANCEIII-700 (16.4 T)</td>
			<td>Bruker</td>
			<td>BH067206</td>
			<td>Wide-bore two channel multinuclear spectrometer equipped with mini and micro-imaging accessories for in vivo small rodent imaging</td>
		</tr>
		<tr>
			<td>TopSpin2.0PV&#160;</td>
			<td>Bruker</td>
			<td>H9088TA2</td>
			<td>Spectrometer processing software&#160;</td>
		</tr>
		<tr>
			<td>Paravision 5.1&#160;</td>
			<td>Bruker</td>
			<td>T10314L5</td>
			<td>Imaging sofware</td>
		</tr>
		<tr>
			<td>VTU BVT 3000 digital</td>
			<td>Bruker</td>
			<td>W1101095</td>
			<td>Temperature controller</td>
		</tr>
	</tbody>
</table>

use of ultra-high field mri in small rodent models of polycystic kidney disease for in vivo phenotyping and drug monitoring

Several in vivo pre-clinical studies in Polycystic Kidney Disease (PKD) utilize orthologous rodent models to identify and study the genetic and molecular mechanisms responsible for the disease, and are very convenient for rapid drug screening and testing of promising therapies. A limiting factor in these studies is often the lack of efficient non-invasive methods for sequentially analyzing the anatomical and functional changes in the kidney. Magnetic resonance imaging (MRI) is the current gold standard imaging technique to follow autosomal dominant polycystic kidney disease (ADPKD) patients, providing excellent soft tissue contrast and anatomic detail and allowing Total Kidney Volume (TKV) measurements.A major advantage of MRI in rodent models of PKD is the possibility for in vivo imaging allowing for longitudinal studies that use the same animal and therefore reducing the total number of animals required. In this manuscript, we will focus on using Ultra-high field (UHF) MRI to non-invasively acquire in vivo images of rodent models for PKD. The main goal of this work is to introduce the use of MRI as a tool for in vivo phenotypical characterization and drug monitoring in rodent models for PKD.

Bu yazıda, PKD ve diğer böbrek hastalıkları için kemirgen modellerinde in vivo fenotipik karakterizasyonu veya ilaç takibi için bir araç olarak UHF MR yararlılığını göstermeyi hedeflemekteyiz. Deneyler Tüm IACUC tarafından onaylanmış deneysel protokollerin bir parçası idi. PKD UHF MRI kullanarak küçük kemirgen modellerinde in vivo feno: Tüm görüntüleme çalışmaları Bruker AVANCEIII-700 (16.4 T) ile, izofluran anestezi...

Watch this Scientific Journal Video about Use of Ultra-high Field MRI in Small Rodent Models of Polycystic Kidney Disease for In Vivo Phenotyping and Drug Monitoring at JoVE.com

Use of Ultra-high Field MRI in Small Rodent Models of Polycystic Kidney Disease for In Vivo Phenotyping and Drug Monitoring

The use of ultra-high field MRI as a non-invasive way to obtain phenotypic information of rodent models for polycystic kidney disease and to monitor interventions is described. Compared with the traditional histological approach, MRI images can be acquired in vivo, allowing for longitudinal follow-up.

Için Polikistik Böbrek Hastalığında Küçük Kemirgen modelleri Ultra yüksek Saha MRI Kullanımı<em&gt; In Vivo</em&gt; Fenotiplendirme ve İlaç İzleme

Several in vivo pre-clinical studies in Polycystic Kidney Disease (PKD) utilize orthologous rodent models to identify and study the genetic and molecular ...

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Research

JoVE Journal

Medicine

Use of Ultra-high Field MRI in Small Rodent Models of Polycystic Kidney Disease for In Vivo Phenotyping and Drug Monitoring

11.4K Görüntüleme.  Mayo Clinic. The use of ultra-high field MRI as a non-invasive way to obtain phenotypic information of rodent models for polycystic kidney disease and to monitor interventions is described. Compared with the traditional histological approach, MRI images can be acquired in vivo, allowing for longitudinal follow-up.

Video: Use of Ultra-high Field MRI in Small Rodent Models of Polycystic Kidney Disease for In Vivo Phenotyping and Drug Monitoring

An in vivo Rodent Model of Contraction-induced Injury and Non-invasive Monitoring of Recovery

Muscle strains are one of the most common complaints treated by physicians. A muscle injury is typically diagnosed from the patient history and physical exam alone, however the clinical presentation can vary greatly depending on the extent of injury, the patient's pain tolerance, etc. In patients with muscle injury or muscle disease, assessment of muscle damage is typically limited to clinical signs, such as tenderness, strength, range of motion, and more recently, imaging studies. Biological markers, such as serum creatine kinase levels, are typically elevated with muscle injury, but their levels do not always correlate with the loss of force production. This is even true of histological findings from animals, which provide a "direct measure" of damage, but do not account for all the loss of function. Some have argued that the most comprehensive measure of the overall health of the muscle in contractile force. Because muscle injury is a random event that occurs under a variety of biomechanical conditions, it is difficult to study. Here, we describe an in vivo animal model to measure torque and to produce a reliable muscle injury. We also describe our model for measurement of force from an isolated muscle in situ. Furthermore, we describe our small animal MRI procedure.

An in vivo Rodent Model of Contraction-induced Injury and Non-invasive Monitoring of Recovery

An in vivo animal model of injury is described. The method takes advantage of the subcutaneous position of the fibular nerve. Velocity, timing of muscle activation, and arc of motion are all pre-determined and synchronized using commercial software. Post injury changes are monitored in vivo using MR imaging/spectroscopy.

Bir In vivo</emDaralma indüklenen Sakatlık ve Kurtarma Non-invaziv İzleme> Kemirgen Model

Muscle strains are one of the most  common complaints treated by physicians. A muscle injury is typically diagnosed from the patient history and  physical ...

Tıp

Spectral Karyotyping to Study Chromosome Abnormalities in Humans and Mice with Polycystic Kidney Disease

Conventional method to identify and classify individual chromosomes depends on the unique banding pattern of each chromosome in a specific species being analyzed 1, 2. This classical banding technique, however, is not reliable in identifying complex chromosomal aberrations such as those associated with cancer. To overcome the limitations of the banding technique, Spectral Karyotyping (SKY) is introduced to provide much reliable information on chromosome abnormalities.
SKY is a multicolor fluorescence in-situ hybridization (FISH) technique to detect metaphase chromosomes with spectral microscope 3, 4. SKY has been proven to be a valuable tool for the cytogenetic analysis of a broad range of chromosome abnormalities associated with a large number of genetic diseases and malignancies 5, 6. SKY involves the use of multicolor fluorescently-labelled DNA probes prepared from the degenerate oligonucleotide primers by PCR. Thus, every chromosome has a unique spectral color after in-situ hybridization with probes, which are differentially labelled with a mixture of fluorescent dyes (Rhodamine, Texas Red, Cy5, FITC and Cy5.5). The probes used for SKY consist of up to 55 chromosome specific probes 7-10.
The procedure for SKY involves several steps (Figure 1). SKY requires the availability of cells with high mitotic index from normal or diseased tissue or blood. The chromosomes of a single cell from either a freshly isolated primary cell or a cell line are spread on a glass slide. This chromosome spread is labeled with a different combination of fluorescent dyes specific for each chromosome. For probe detection and image acquisition,the spectral imaging system consists of sagnac interferometer and a CCD camera. This allows measurement of the visible light spectrum emitted from the sample and to acquire a spectral image from individual chromosomes. HiSKY, the software used to analyze the results of the captured images, provides an easy identification of chromosome anomalies. The end result is a metaphase and a karyotype classification image, in which each pair of chromosomes has a distinct color (Figure 2). This allows easy identification of chromosome identities and translocations. For more details, please visit Applied Spectral Imaging website (<a href="http://www.spectral-imaging.com/" target="_blank">http://www.spectral-imaging.com/</a>).
SKY was recently used for an identification of chromosome segregation defects and chromosome abnormalities in humans and mice with Autosomal Dominant Polycystic Kidney Disease (ADPKD), a genetic disease characterized by dysfunction in primary cilia 11-13. Using this technique, we demonstrated the presence of abnormal chromosome segregation and chromosomal defects in ADPKD patients and mouse models 14. Further analyses using SKY not only allowed us to identify chromosomal number and identity, but also to accurately detect very complex chromosomal aberrations such as chromosome deletions and translocations (Figure 2).

Spectral Karyotyping (SKY) is an advanced cytogenetics technique to identify genomic and chromosomal aberrations. This technique takes advantage of chromosome painting probes, which allow classification of all chromosomes. SKY can also identify complex chromosome aberrations and segregation defects in mice and humans with various diseases, including polycystic kidney disease.

Polikistik Böbrek Hastalığı Olan İnsanlar ve Fareler kromozom anomalileri Eğitim Spektral Karyotipik

Conventional method to identify and classify individual chromosomes depends on the unique banding pattern of each chromosome in a specific species being ...

The Use of Primary Human Fibroblasts for Monitoring Mitochondrial Phenotypes in the Field of Parkinson's Disease

Parkinson's disease (PD) is the second most common movement disorder and affects 1% of people over the age of 60 1. Because ageing is the most important risk factor, cases of PD will increase during the next decades 2. Next to pathological protein folding and impaired protein degradation pathways, alterations of mitochondrial function and morphology were pointed out as further hallmark of neurodegeneration in PD 3-11.
After years of research in murine and human cancer cells as in vitro models to dissect molecular pathways of Parkinsonism, the use of human fibroblasts from patients and appropriate controls as ex vivo models has become a valuable research tool, if potential caveats are considered. Other than immortalized, rather artificial cell models, primary fibroblasts from patients carrying disease-associated mutations apparently reflect important pathological features of the human disease.
Here we delineate the procedure of taking skin biopsies, culturing human fibroblasts and using detailed protocols for essential microscopic techniques to define mitochondrial phenotypes. These were used to investigate different features associated with PD that are relevant to mitochondrial function and dynamics. Ex vivo, mitochondria can be analyzed in terms of their function, morphology, colocalization with lysosomes (the organelles degrading dysfunctional mitochondria) and degradation via the lysosomal pathway. These phenotypes are highly relevant for the identification of early signs of PD and may precede clinical motor symptoms in human disease-gene carriers. Hence, the assays presented here can be utilized as valuable tools to identify pathological features of neurodegeneration and help to define new therapeutic strategies in PD.

The Use of Primary Human Fibroblasts for Monitoring Mitochondrial Phenotypes in the Field of Parkinson&#039;s Disease

Fibroblasts from patients carrying mutations in Parkinson's disease-causing genes represent an easily accessible ex vivo model to study disease-associated phenotypes. Live cell imaging gives the opportunity to study morphological and functional parameters in living cells. Here we describe the preparation of human fibroblasts and subsequent monitoring of mitochondrial phenotypes.

Parkinson Hastalığı Alanında Mitokondriyal Fenotiplerinin İzleme İlköğretim İnsan Fibroblast Kullanımı

Parkinson's disease (PD) is the second most  common movement disorder and affects 1% of people over the age of 60 1. Because ageing is  the most important ...

Assessment of Cardiac Function and Myocardial Morphology Using Small Animal Look-locker Inversion Recovery (SALLI) MRI in Rats

Small animal magnetic resonance imaging is an important tool to study cardiac function and changes in myocardial tissue. The high heart rates of small animals (200 to 600 beats/min) have previously limited the role of CMR imaging. Small animal Look-Locker inversion recovery (SALLI) is a T1 mapping sequence for small animals to overcome this problem 1. T1 maps provide quantitative information about tissue alterations and contrast agent kinetics. It is also possible to detect diffuse myocardial processes such as interstitial fibrosis or edema 1-6. Furthermore, from a single set of image data, it is possible to examine heart function and myocardial scarring by generating cine and inversion recovery-prepared late gadolinium enhancement-type MR images 1.
	The presented video shows step-by-step the procedures to perform small animal CMR imaging. Here it is presented with a healthy Sprague-Dawley rat, however naturally it can be extended to different cardiac small animal models.

Assessment of Cardiac Function and Myocardial Morphology Using Small Animal Look-locker Inversion Recovery SALLI MRI in Rats

Contrast enhanced cardiac magnetic resonance (CMR) imaging allows comprehensive in vivo assessment of the heart in small animal models of cardiovascular disease. Here we detail the procedures to perform CMR imaging, reconstruction and analysis using Small Animal Lock-Locker Inversion Recovery (SALLI) in rats.

Küçük Hayvan Bak-soyunma Ters Kurtarma (SALLI) Sıçanlarda MRI kullanarak Kalp Fonksiyonu ve Miyokard Morfoloji Değerlendirilmesi

Small animal magnetic resonance  imaging is an important tool to study cardiac function and changes in myocardial  tissue. The high heart rates of small ...

In vivo 19F MRI for Cell Tracking

In vivo 19F MRI allows quantitative cell tracking without the use of ionizing radiation. It is a noninvasive technique that can be applied to humans. Here, we describe a general protocol for cell labeling, imaging, and image processing. The technique is applicable to various cell types and animal models, although here we focus on a typical mouse model for tracking murine immune cells. The most important issues for cell labeling are described, as these are relevant to all models. Similarly, key imaging parameters are listed, although the details will vary depending on the MRI system and the individual setup. Finally, we include an image processing protocol for quantification. Variations for this, and other parts of the protocol, are assessed in the Discussion section. Based on the detailed procedure described here, the user will need to adapt the protocol for each specific cell type, cell label, animal model, and imaging setup. Note that the protocol can also be adapted for human use, as long as clinical restrictions are met.

In vivo 19F MRI for Cell Tracking

We describe a general protocol for in vivo cell tracking using MRI in a mouse model with ex vivo labeled cells. A typical protocol for cell labeling, image acquisition processing and quantification is included.

Hücre Takip için vivo 19 F MRG

In vivo 19F MRI allows quantitative cell tracking without the use of ionizing radiation. It is a noninvasive technique that can be applied to humans. ...

MRI and PET in Mouse Models of Myocardial Infarction

Myocardial infarction is one of the leading causes of death in the Western world. The similarity of the mouse heart to the human heart has made it an ideal model for testing novel therapeutic strategies.
In vivo magnetic resonance imaging (MRI) gives excellent views of the heart noninvasively with clear anatomical detail, which can be used for accurate functional assessment. Contrast agents can provide basic measures of tissue viability but these are nonspecific. Positron emission tomography (PET) is a complementary technique that is highly specific for molecular imaging, but lacks the anatomical detail of MRI. Used together, these techniques offer a sensitive, specific and quantitative tool for the assessment of the heart in disease and recovery following treatment.
In this paper we explain how these methods are carried out in mouse models of acute myocardial infarction. The procedures described here were designed for the assessment of putative protective drug treatments. We used MRI to measure systolic function and infarct size with late gadolinium enhancement, and PET with fluorodeoxyglucose (FDG) to assess metabolic function in the infarcted region. The paper focuses on practical aspects such as slice planning, accurate gating, drug delivery, segmentation of images, and multimodal coregistration. The methods presented here achieve good repeatability and accuracy maintaining a high throughput.

We describe how to perform MRI and PET imaging of the mouse heart. The protocol is tailored to assess treatment efficacy in models of myocardial infarction and heart failure.

Myocardial infarction is one of the leading causes of death in the Western world. The similarity of the mouse heart to the human heart has made it an ...

A Possible Zebrafish Model of Polycystic Kidney Disease: Knockdown of wnt5a Causes Cysts in Zebrafish Kidneys

Polycystic kidney disease (PKD) is one of the most common causes of end-stage kidney disease, a devastating disease for which there is no cure. The molecular mechanisms leading to cyst formation in PKD remain somewhat unclear, but many genes are thought to be involved. Wnt5a is a non-canonical glycoprotein that regulates a wide range of developmental processes. Wnt5a works through the planar cell polarity (PCP) pathway that regulates oriented cell division during renal tubular cell elongation. Defects of the PCP pathway have been found to cause kidney cyst formation. Our paper describes a method for developing a zebrafish cystic kidney disease model by knockdown of the wnt5a gene with wnt5a antisense morpholino (MO) oligonucleotides. Tg(wt1b:GFP) transgenic zebrafish were used to visualize kidney structure and kidney cysts following wnt5a knockdown. Two distinct antisense MOs (AUG - and splice-site) were used and both resulted in curly tail down phenotype and cyst formation after wnt5a knockdown. Injection of mouse Wnt5a mRNA, resistant to the MOs due to a difference in primary base pair structure, rescued the abnormal phenotype, demonstrating that the phenotype was not due to &#8220;off-target&#8221; effects of the morpholino. This work supports the validity of using a zebrafish model to study wnt5a function in the kidney.

A Possible Zebrafish Model of Polycystic Kidney Disease: Knockdown of wnt5a Causes Cysts in Zebrafish Kidneys

We describe a method of generating a possible zebrafish model of polycystic kidney disease. We used Tg(wt1b:GFP) fish to visualize kidney structure. Knockdown of wnt5a was by morpholino injection. Pronephric cyst formation after wnt5a knockdown was observed in this GFP transgenic zebrafish.

Polikistik Böbrek Hastalığı Olası Zebra balığı Modeli: demonte<em&gt; Wnt5a</em&gt; Zebra balığı Böbrekler Kistler Nedenler

Polycystic kidney disease (PKD) is one of the most common causes of end-stage kidney disease, a devastating disease for which there is no cure. The ...

Ex Vivo Intestinal Sacs to Assess Mucosal Permeability in Models of Gastrointestinal Disease

The epithelial barrier is the first innate defense of the gastrointestinal tract and selectively regulates transport from the lumen to the underlying tissue compartments, restricting the transport of smaller molecules across the epithelium and almost completely prohibiting epithelial macromolecular transport. This selectivity is determined by the mucous gel layer, which limits the transport of lipophilic molecules and both the apical receptors and tight junctional protein complexes of the epithelium. In vitro cell culture models of the epithelium are convenient, but as a model, they lack the complexity of interactions between the microbiota, mucous-gel, epithelium and immune system. On the other hand, in vivo assessment of intestinal absorption or permeability may be performed, but these assays measure overall gastrointestinal absorption, with no indication of site specificity. Ex vivo permeability assays using &#34;intestinal sacs&#34; are a rapid and sensitive method of measuring either overall intestinal integrity or comparative transport of a specific molecule, with the added advantage of intestinal site specificity. Here we describe the preparation of intestinal sacs for permeability studies and the calculation of the apparent permeability (Papp) of a molecule across the intestinal barrier. This technique may be used as a method of assessing drug absorption, or to examine regional epithelial barrier dysfunction in animal models of gastrointestinal disease.

Ex Vivo Intestinal Sacs to Assess Mucosal Permeability in Models of Gastrointestinal Disease

This protocol describes the use of excised intestinal tissue preparations or "intestinal sacs" as an ex vivo model of intestinal barrier function. This model may be used to assess integrity of both the epithelial barrier and the mucous gel layer at specific intestinal sites in animal models of digestive disease.

Ex Vivo Bağırsak Sacs Gastrointestinal Hastalık Modelleri mukozal geçirgenliği Değerlendirmek için

The epithelial barrier is the first innate defense of the gastrointestinal tract and selectively regulates transport from the lumen to the underlying ...

Quantitative 3D In Silico Modeling (q3DISM) of Cerebral Amyloid-beta Phagocytosis in Rodent Models of Alzheimer's Disease

Neuroinflammation is now recognized as a major etiological factor in neurodegenerative disease. Mononuclear phagocytes are innate immune cells responsible for phagocytosis and clearance of debris and detritus. These cells include CNS-resident macrophages known as microglia, and mononuclear phagocytes infiltrating from the periphery. Light microscopy has generally been used to visualize phagocytosis in rodent or human brain specimens. However, qualitative methods have not provided definitive evidence of in vivo phagocytosis. Here, we describe quantitative 3D in silico modeling (q3DISM), a robust method allowing for true 3D quantitation of amyloid-&#946; (A&#946;) phagocytosis by mononuclear phagocytes in rodent Alzheimer&#39;s Disease (AD) models. The method involves fluorescently visualizing A&#946; encapsulated within phagolysosomes in rodent brain sections. Large z-dimensional confocal datasets are then 3D reconstructed for quantitation of A&#946; spatially colocalized within the phagolysosome. We demonstrate the successful application of q3DISM to mouse and rat brains, but this methodology can be extended to virtually any phagocytic event in any tissue.

Quantitative 3D In Silico Modeling q3DISM of Cerebral Amyloid-beta Phagocytosis in Rodent Models of Alzheimer&#039;s Disease

We developed a methodology for quantitative 3D in silico modeling (q3DISM) of cerebral amyloid-&#946; (A&#946;) phagocytosis by mononuclear phagocytes in rodent models of Alzheimer&#39;s disease. This method can be generalized for the quantitation of virtually any phagocytic event in vivo.

kantitatif 3D<em&gt; Siliko</emAlzheimer Hastalığının Kemirgen Modelleri Serebral Amiloid-beta Fagositoz&gt; Modelleme (q3DISM)

Neuroinflammation is now recognized as a major etiological factor in neurodegenerative disease. Mononuclear phagocytes are innate immune cells responsible ...

In Vivo Evaluation of Fracture Callus Development During Bone Healing in Mice Using an MRI-compatible Osteosynthesis Device for the Mouse Femur

Endochondral fracture healing is a complex process involving the development of fibrous, cartilaginous, and osseous tissue in the fracture callus. The amount of the different tissues in the callus provides important information on the fracture healing progress. Available in vivo techniques to longitudinally monitor the callus tissue development in preclinical fracture-healing studies using small animals include digital radiography and &#181;CT imaging. However, both techniques are only able to distinguish between mineralized and non-mineralized tissue. Consequently, it is impossible to discriminate cartilage from fibrous tissue. In contrast, magnetic resonance imaging (MRI) visualizes anatomical structures based on their water content and might therefore be able to noninvasively identify soft tissue and cartilage in the fracture callus. Here, we report the use of an MRI-compatible external fixator for the mouse femur to allow MRI scans during bone regeneration in mice. The experiments demonstrated that the fixator and a custom-made mounting device allow repetitive MRI scans, thus enabling longitudinal analysis of fracture-callus tissue development.

In Vivo Evaluation of Fracture Callus Development During Bone Healing in Mice Using an MRI-compatible Osteosynthesis Device for the Mouse Femur

The evaluation of tissue development in the fracture callus during endochondral bone healing is essential to monitor the healing process. Here, we report the use of a magnetic resonance imaging (MRI)-compatible external fixator for the mouse femur to allow MRI scans during bone regeneration in mice.

Vivo Fare uyluk için bir MRI uyumlu Osteosentez aygıtı kullanma farelerde kemik iyileşme sırasında kırık Kallus gelişimi değerlendirme

Endochondral fracture healing is a complex process involving the development of fibrous, cartilaginous, and osseous tissue in the fracture callus. The ...