Name: direct mouse trauma/burn model of heterotopic ossification
Uploaded: 2015-08-06T14:00:00.000+00:00
Duration: 7 min 1 s
Description: Watch this Scientific Journal Video about Direct Mouse Trauma/Burn Model of Heterotopic Ossification at JoVE.com

We thank Amanda Fair, the CMI, and Kathy Sweet and the ORL at UM for assistance with &#181;CT imaging and analysis. Funding: BL Funded by 1K08GM109105-01 and Plastic Surgery Foundation National Endowment Award.

Etik bildirimi: Laboratuar Hayvan Araştırmaları Enstitüsü&#39;nden Sekizinci Edition (Ilar, 2011) ve kişi: Bütün hayvan prosedürleri Laboratuvar Hayvanları Kullanımı ve Bakımı Kılavuzda verilen kılavuzda tanımlanan iyi hayvan uygulamaları ile tam uyum içinde gerçekleştirilmiştir Michigan Üniversitesi&#39;nden Kurumsal Hayvan Bakım ve Kullanım Kurulu (PRO0001553) tarafından onaylanmıştır. 1. Fare Cerrahi İşlemleri NOT: 8-10 haftalık C57BL / 6 fareler. Diğer yaş, arka planlar ve farelerin suşları farklı koşullar veya genetik makyaj test etmek için kullanılır. Prosedürün tenotomi kısmı için, yüz maskesi, saç kaputu ve steril önlük, eldiven ve enstrümanları kullanarak steril koşullar korumak. Cerrahi siteler steril povidon-iyot ve steril draping ile hazırlanmalıdır. 37 ° C resüsitasyon çözümleri bir veteriner ısıtma yastığı kullanılarak ve ısıtarak hipotermi önlemek yönetilmekteydi önceyon. <ol><li> % 2.5 solunan izofluran kullanarak fare anestezisi. Kolay erişilebilir dorsum ve arka-bacaklarda bırakmak için bir burun konisi kullanın. Mukoza zarının uygun solunum hızı ve renklerini korumak için izofluran yönetiminin hızını ayarlayın ve kas tonusu, ayak tutam ve kornea refleksi kontrol ederek anestezi sağlamak. İşlem sırasında kuru göz yaralanmasını önlemek için farenin gözlerine mülayim oftalmik merhem sürün. Cerrahi alanının altında bir veteriner ısıtma yastığı veya sıcak su sirkülatör kullanılarak yeterli vücut ısısını korumak. </li><li> Analjezi için cerrahi subkutan hemen önce, buprenorfin, 0.1 mg / kg yönetme. </li><li> Yakından diz topuktan makası kullanarak sol arka pençe cerrahi siteyi tıraş. </li><li> Yakından omurga üzerinde başlayan ve dorsal orta hattın solunda traş alanını genişleten yanık karşılamak için bir alan en az 2 cm x 3 cm temizleyerek, fare dorsumuna tıraş. </li><li>3 alternatif povidon-iyot scrubs kullanarak diz arka pençesine dahil, cerrahi siteyi hazırlayın. </li><li> Sol Aşil tendonu medial boyunca uzunlamasına bir kesi yapın. Aşil tendonu kolayca görülebilmesi böylece kesi uzatmak; Yaklaşık 0.5 cm. </li><li> Keskin doku makas ile orta noktasında tendonun keskin diseksiyon ile Aşil tenotomisi gerçekleştirin. Tendon altındaki doku düzleminde doku makas biri bıçak yerleştirin ve bıçak tendon orta noktasında olduğu kadar düzlem boyunca teşrih. Keskin tendon koparmaya makas bıçakları kapatın. NOT: Gastrocnemius, Soleus ve Plantaris tendonlar da dahil olmak üzere tüm arka tendonların dahil olun. </li><li> Steril gazlı bez ile basınç uygulayarak hemostaz (orada en az kanama olmalıdır) ve 5-0 vikril dikiş ile cilt kesisi kapatın. </li><li> Yaklaşık ölçümü ile 35 g ağırlığında bir alüminyum bloğu ile dorsal kısmi kalınlıkta yanık gerçekleştirints 2 cm x 2 cm x 3 cm 17 sn için fare traş sırtına tatbik edilen bir su banyosu içinde 60 ° C&#39;ye kadar ısıtıldı. Not: Bununla birlikte, yani blok için ek basınç uygulamak bilmek bloğun bütün yüzey alanı fare ile temas halinde olması sağlanır anestezi fare üstünde blok dinlenme uygun yanık derinliği elde için yerçekimi izin yerinde bloğu tutan tek güç. Bloğun bir tarafına bağlı bir ince plastik kolu sıcak su banyosundan manipülasyonu, stabilizasyon ve alınması için uygundur. Bu yaklaşık% 30 toplam vücut yüzey alanı 8-10 haftalık C57BL / 6 fare yanık oluşturur. Bu iletişim yanık nedeniyle yara üzerinde yanık derinliği bütünlüğü ve hayvanlar arasındaki tekrarlanabilirlik diğer yöntemlerle (alev veya haşlanma yanığı) üzerinden seçildi. </li><li> Gazlı bez ile yanık sitesini kurulayın ve bir TEGADERM pansuman uygulanır. </li><li> Isıtılmış canlandırma sıvıları yönetme: Laktatlı Ringer çözeltisi 1 mlintraperitoneal enjeksiyon ve 0.5 ml deri altı enjeksiyonu. Resüsitasyon Bu tek seferlik idare yanık ve tenotomi kurtarma için yeterli. NOT: fareler tamamen iyileşti kadar gözetim altında temiz kafeslerde tek tek diğer fareler konut kafesleri evin anestezi fareler iade etmeyin. Tipik geri kazanım 1-6 saat içinde gerçekleşir. Yanık siteleri genellikle 2-4 hafta içinde iyileşir ve temiz konut ortamlarında muhafaza edilmesi durumunda nadiren yara enfeksiyonu ile komplike olur. </li><li> Buprenorfin 0.1 mg / kg deri altı enjeksiyonu prosedüre göre, 3 gün süre ile, her 12 saat uygulayın. Uygun aralıklarla seri uCT taramaları ile HO büyüme izleyin. Ektopik kemik büyümesi ilk uCT tarafından belirgin yaklaşık 3 hafta post-op olduğunu. NOT: HO geliştirme çoğunluğu post-op 9 hafta tamamlandı. Biz 15 haftada tarama uCT tek uç noktaya göre 15 hafta süreyle iki haftalık HO hacim veya tekrarlanan uCT ile yerde fark tarar gözlenen değil.Deneylerin sonunda, kurumsal kurallarına göre CO 2 inhalasyon sahip tüm fareleri euthanize ve 10 dakika sonra servikal dislokasyon ile ölüm doğrulayın. </li></ol> 2. uCT Toplama ve Analizi <ol><li> Yüzüstü pozisyonda tarayıcı yatağına anestezi fare sabitleyin. Hareket objeyi nefes önlemek için yatağa sıkıca arka bacaklarda bantlayın. Görüntü kalibrasyonu için fare altındaki hayalet içeren hava, su ve hidroksiapatit ekleyin. </li><li> Kemik Analizi yazılımı açın ve proksimal distale arka pençe ucuna kalça eklemi hem arka bacaklarda kapsar faiz (ROI) bir bölgeyi tanımlamak. Aşağıdaki parametreleri kullanarak bir görüntü elde. 80 kV, 500 uA ve 1.300 msn maruz kalma, 48 mikron voksel boyutu 14,15 </li><li> Uygun alanlara ortalama yoğunluğu üç hayalet odalarının her birinde bir yatırım getirisi çizerek ve girilerek Hounsfield üniteleri (HU) görüntü kalibreyazılımı. </li><li> Sol arka bacak tibia paralel ortotopik kortikal kemik yapıları ve HO belirlenmesi için net anatomik görünüm sağlamak için Z ekseni boyunca yani yazılımdaki &quot;kapmak&quot; aracını kullanarak, görüntüyü yeniden yönlendirin. </li><li> HO karşılaştı kadar diz başlayarak, görüntü dilimleri boyunca distale ilerleyin. Manuel spline aracını kullanarak, pençe üzerinden veya HO aştı kadar distale devam her 5 inci dilim ektopik kemik etrafında bir ROI yapmak. Genişletmek ve tüm HO içeren tek bir ROI bir araya İB&#39;leri dikiş tahmin etmek aracını kullanın. </li><li> 3D yatırım getirisi yapın ve analiz menüsünü seçin. En iyi kemik penceresini göstermek alt ve üst eşik değerlerini ayarlayarak kemik hacmini hesaplayın. Tüm taramalar için aynı sabit eşik değerlerini kullanın. </li></ol>

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D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Heterotopic+ossification+after+extremity+blast+amputation+in+a+Sprague-Dawley+rat+animal+model.">Heterotopic ossification after extremity blast amputation in a Sprague-Dawley rat animal model.</a> J Orthop Trauma. 25 (8), 506-510 (2011).</li><li>Tannous, O., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Heterotopic+bone+formation+about+the+hip+undergoes+endochondral+ossification:+a+rabbit+model.">Heterotopic bone formation about the hip undergoes endochondral ossification: a rabbit model.</a> Clin Orthop Relat Res. 471 (5), 1584-1592 (2013).</li><li>Peterson, J. R., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Treatment+of+heterotopic+ossification+through+remote+ATP+hydrolysis.">Treatment of heterotopic ossification through remote ATP hydrolysis.</a> Sci Transl Med. 6 (255), 255ra132 (2014).</li><li>Peterson, J. R., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Early+detection+of+burn+induced+heterotopic+ossification+using+transcutaneous+Raman+spectroscopy.">Early detection of burn induced heterotopic ossification using transcutaneous Raman spectroscopy.</a> Bone. 54 (1), 28-34 (2013).</li><li>Perosky, J. 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A., Forsberg, J. A., Potter, B. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Blast+injuries+and+heterotopic+ossification.">Blast injuries and heterotopic ossification.</a> Bone and Joint Research. 1 (8), 174-179 (2012).</li><li>Hunt, J. L., Arnoldo, B. D., Kowalske, K., Helm, P., Purdue, G. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Heterotopic+ossification+revisited:+a+21-year+surgical+experience.">Heterotopic ossification revisited: a 21-year surgical experience.</a> J Burn Care Res. 27 (4), 535-540 (2006).</li><li>Ring, D., Jupiter, J. B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Operative+release+of+ankylosis+of+the+elbow+due+to+heterotopic+ossification.+Surgical+technique.">Operative release of ankylosis of the elbow due to heterotopic ossification. Surgical technique.</a> J Bone Joint Surg Am. 86-A, 2-10 (2004).</li><li>Crane, N. J., Polfer, E., Elster, E. A., Potter, B. K., Forsberg, J. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Raman+spectroscopic+analysis+of+combat-related+heterotopic+ossification.">Raman spectroscopic analysis of combat-related heterotopic ossification.</a> Bone. 57 (2), 335-342 (2013).</li></ol>

The authors have nothing to disclose

Heterotopic ossification represents a major functional impairment faced by patients that sustain trauma, burns, and invasive musculoskeletal procedures. The most at-risk population are soldiers in modern conflicts with major blast injuries from mechanisms such as improvised explosive devices (IED).18 Improved body armor and forward positioned medical units allows for improved survival of major extremity injury. After initial stabilization and repair of their extremity injury, these patients are at high risk...

Heterotopic ossification (HO) is the formation of ectopic bone in which osteo-potent cells are aberrantly induced to form endochondral bone outside of the skeleton. While the details of the HO formation pathway are still largely unknown, an accepted paradigm includes three key factors: an inflammatory inciting incident, a permissive niche, and mesenchymal stem cells capable of forming bone.1-3 HO is a common comorbidity complicating over 60% of major burn injuries, 65% of combat-related injuries, and 10% of invasive orthopaedic surgery cases.4,5 However, it is often difficult to predict where HO will form because it can occur at sites of local injury or at distant locations that may be otherwise uninjured. This variability in location makes it difficult to intervene prophylactically to prevent reactive bone formation in a locally targeted manner. There are also congenital forms of HO such as fibrodysplasia ossificans progressiva (FOP) in which patients are prone to the development of robust HO in response to minor trauma or inflammatory insult. Powerful animal models using transgenic mice have reproduced this phenotype and provided insight to the molecular pathways that may also be important in trauma induced HO.6-9 Translational research into the pathogenesis of non-congenital HO has used a wide variety of constructs ranging from injury alone to the implantation of exogenous osteo-inductive materials and/or cells.10-13
In our prior work we have validated a simple and reliable model of HO formation in mice which does not require the administration of any exogenous material.14-17 This model created two key conditions to initiate HO: local trauma and global inflammation. This was achieved through the use of an Achilles tenotomy (local trauma) combined with a distant burn injury (global inflammation). Mice received both treatments concurrently and were found to develop a robust amount of HO that could be analyzed by histologic, radiologic, and molecular means. Interestingly, concurrent burn injury significantly increased the amount of HO that formed and accelerated its developmental time-course.14-16 HO developed at predictable sites around the calcaneus, ankle joint, and tibia/fibula of the limb that received the tenotomy. The reliability of HO development at a known location allowed for focused examination of molecular and histologic features in the early stages of ectopic ossification.14,17 To date, 100% of mice (over 50 animals) with a tenotomy and concurrent burn injury have developed HO. Additionally, longitudinal 2D and 3D imaging and spectroscopic analysis were conducted to examine the growth pattern and biochemical make-up of HO.15,16

<table><tbody><tr><td>C57BL/6 mice</td><td>Jackson Laboratory</td><td>664</td><td>8-10 weeks old</td></tr><tr><td>Isoflurane &amp;ndash; Fluriso</td><td>VET one, Boise, ID</td><td>V1 501017</td><td></td></tr><tr><td>Buprenorphine &amp;ndash; Buprenex</td><td>Reckitt Benckiser Healthcare</td><td>NDC 12496-0757-1</td><td>0.3 mg/ml solution</td></tr><tr><td>Betadine</td><td>Owens and Minor, Mechanicsville, VA</td><td>2047PVP202</td><td></td></tr><tr><td>5-0 Vicryl sutures</td><td>Ethicon, Summerville, NJ</td><td>J493</td><td></td></tr><tr><td>Tegaderm Film, 6 cm x 7 cm</td><td>3M</td><td>1624W</td><td>Cut in half to properly cover burn site</td></tr><tr><td>&amp;micro;CT - GE eXplore Locus SP</td><td>GE Healthcare Pre-Clinical Imaging, London, ON, Canada</td><td></td><td></td></tr><tr><td>Microview 2.2 Advanced Bone Analysis Application</td><td>GE Healthcare Pre-Clinical Imaging, London, ON, Canada</td><td></td><td></td></tr></tbody></table>

direct mouse trauma/burn model of heterotopic ossification

Heterotopic ossification (HO) is the formation of bone outside of the skeleton which forms following major trauma, burn injuries, and orthopaedic surgical procedures. The majority of animal models used to study HO rely on the application of exogenous substances, such as bone morphogenetic protein (BMP), exogenous cell constructs, or genetic mutations in BMP signaling. While these models are useful they do not accurately reproduce the inflammatory states that cause the majority of cases of HO. Here we describe a burn/tenotomy model in mice that reliably produces focused HO. This protocol involves creating a 30% total body surface area partial thickness contact burn on the dorsal skin as well as division of the Achilles tendon at its midpoint. Relying solely on traumatic injury to induce HO at a predictable location allows for time-course study of endochondral heterotopic bone formation from intrinsic physiologic processes and environment only. This method could prove instrumental in understanding the inflammatory and osteogenic pathways involved in trauma-induced HO. Furthermore, because HO develops in a predictable location and time-course in this model, it allows for research to improve early imaging strategies and treatment modalities to prevent HO formation.

Bu çalışmamızda, protokol travma önce yayınlanan fare modeli tarif edilmiştir / HO. 14-17 Bu yanık kısmi kalınlıkta bir Aşil tenotomisinin ve küresel inflamatuar hakaret ile eş zamanlı lokalize kas-iskelet yaralanması oluşturulmasını içerir kaynaklı yanık. Bu seri görüntüleme ile takip edilebilir tenotominin sahasında reaktif kemik güvenilir oluşumu ile sonuçlanır. Bugüne kadar, hem Aşil tenotomisi sürekli ve yanık var (50&#39;den fazla) tüm fareler tenotomi yerinde HO ölç...

Watch this Scientific Journal Video about Direct Mouse Trauma/Burn Model of Heterotopic Ossification at JoVE.com

Direct Mouse Trauma/Burn Model of Heterotopic Ossification

An Achilles tenotomy and burn injury model of heterotopic ossification allows for the reliable study of trauma induced ectopic bone formation without the application of exogenous factors.

Doğrudan Fare Travma / Heterotopik Kemikleşme Model Yanık

Heterotopic ossification (HO) is the formation of bone outside of the skeleton which forms following major trauma, burn injuries, and orthopaedic surgical ...

direct-mouse-traumaburn-model-of-heterotopic-ossification

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10.0K Görüntüleme.  University of Michigan Medical School. An Achilles tenotomy and burn injury model of heterotopic ossification allows for the reliable study of trauma induced ectopic bone formation without the application of exogenous factors.

Video: Direct Mouse Trauma/Burn Model of Heterotopic Ossification

Pseudofracture: An Acute Peripheral Tissue Trauma Model

Following trauma there is an early hyper-reactive inflammatory response that can lead to multiple organ dysfunction and high mortality in trauma patients; this response is often accompanied by a delayed immunosuppression that adds the clinical complications of infection and can also increase mortality.1-9 Many studies have begun to assess these changes in the reactivity of the immune system following trauma.10-15 
Immunologic studies are greatly supported through the wide variety of transgenic and knockout mice available for in vivo modeling; these strains aid in detailed investigations to assess the molecular pathways involved in the immunologic responses.16-21
The challenge in experimental murine trauma modeling is long term investigation, as fracture fixation techniques in mice, can be complex and not easily reproducible.22-30
This pseudofracture model, an easily reproduced trauma model, overcomes these difficulties by immunologically mimicking an extremity fracture environment, while allowing freedom of movement in the animals and long term survival without the continual, prolonged use of anaesthesia. The intent is to recreate the features of long bone fracture; injured muscle and soft tissue are exposed to damaged bone and bone marrow without breaking the native bone.
The pseudofracture model consists of two parts: a bilateral muscle crush injury to the hindlimbs, followed by injection of a bone solution into these injured muscles. The bone solution is prepared by harvesting the long bones from both hindlimbs of an age- and weight-matched syngeneic donor. These bones are then crushed and resuspended in phosphate buffered saline to create the bone solution.
Bilateral femur fracture is a commonly used and well-established model of extremity trauma, and was the comparative model during the development of the pseudofracture model. Among the variety of available fracture models, we chose to use a closed method of fracture with soft tissue injury as our comparison to the pseudofracture, as we wanted a sterile yet proportionally severe peripheral tissue trauma model. 31
Hemorrhagic shock is a common finding in the setting of severe trauma, and the global hypoperfusion adds a very relevant element to a trauma model. 32-36 The pseudofracture model can be easily combined with a hemorrhagic shock model for a multiple trauma model of high severity. 37

Pseudofracture, a reproducible murine model of sterile musculoskeletal trauma, allows for evaluation of late term post-traumatic immune responses. This article describes the procedural execution of the model step by step, including the potential for experimental model combinations to permit study of multiple trauma.

Pseudofracture: Akut Periferik Doku Travma Modeli

Following trauma there is an early hyper-reactive inflammatory response that can lead to multiple organ dysfunction and high mortality in trauma patients; ...

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Intratibial Osteosarcoma Cell Injection to Generate Orthotopic Osteosarcoma and Lung Metastasis Mouse Models

Osteosarcoma is the most common primary bone cancer in children and adolescents, with lungs as the most common metastatic site. The five-year survival rate of osteosarcoma patients with pulmonary metastasis is less than 30%.Therefore, the utilization of mouse models mimicking the osteosarcoma development in humans is of great significance for understanding the fundamental mechanism of osteosarcoma carcinogenesis and pulmonary metastasis to develop novel therapeutics. Here, detailed procedures are reported to generate the primary osteosarcoma and pulmonary metastasis mouse models via&#160;intratibia injection of osteosarcoma cells. Combined with the bioluminescence or X-ray live imaging system, these living mouse models are utilized to monitor and quantify osteosarcoma growth and metastasis. To establish this model, a basement membrane matrix containing osteosarcoma cells was loaded in a micro-volume syringe and injected into one tibia of each athymic mouse after being anesthetized. The mice were sacrificed when the primary osteosarcoma reached the size limitation in the IACUC-approved protocol. The legs bearing osteosarcoma and the lungs with metastasis lesions were separated. These models are characterized by a short incubation period, rapid growth, severe lesions, and sensitivity in monitoring the development of primary and pulmonary metastatic lesions. Therefore, these are ideal models for exploring the functions and mechanisms of specific factors in osteosarcoma carcinogenesis and pulmonary metastasis, the tumor microenvironment, and evaluating the therapeutic efficacy in vivo.

The present protocol describes intratibia osteosarcoma cell injection to generate mouse models bearing orthotopic osteosarcoma and pulmonary metastasis lesions.

Ortotopik Osteosarkom ve Akciğer Metastazı Fare Modelleri Oluşturmak için İntratibiyal Osteosarkom Hücre Enjeksiyonu

Osteosarcoma is the most common primary bone cancer in children and adolescents, with lungs as the most common metastatic site. The five-year survival ...

Kanser Araştırmaları

A Mouse Distraction Osteogenesis Model

Distraction osteogenesis (DO) is a surgical procedure that involves skeletal tissue regeneration without cell transplantation. A DO model consists of the following three phases: the latency phase after osteotomy and placement of the external distractor; the distraction phase, wherein the separated bone ends are gradually and continuously distracted; and the consolidation phase. This custom-made distractor used for DO is comprised of two incomplete acrylic resin rings and an expansion screw. The process was initiated by making a mold with silicone impression material and then creating the custom-made distractor. Dental resin was poured into the formwork made of silicone impression material, and it was allowed to polymerize to create the incomplete resin rings required for the custom-made distractor. These rings were fixed with an expansion screw using transparent resin. The custom-made distractor created via this approach was attached to the tibia of mice. The tibia was fixed to the device using one pair of 25 G needles proximally, one pair of 27 G needles distally, and acrylic resin. After a latency period of 5 days, distraction was initiated at a rate of 0.2 mm/12 h. The lengthening was continued for 8 days, resulting in a total gap of 3.2 mm. The mice were sacrificed 4 weeks after distraction. Bone formation in the distraction gap was confirmed using both radiography and histology.

We present a mouse tibial distraction osteogenesis model developed using a custom-made distractor. The use of a mouse as an analysis target is advantageous for advancing research.

Bir fare oyalama Osteogenesis modeli

Distraction osteogenesis (DO) is a surgical procedure that involves skeletal tissue regeneration without cell transplantation. A DO model consists of the ...

Gelişim Biyolojisi

Adult Mouse Digit Amputation and Regeneration: A Simple Model to Investigate Mammalian Blastema Formation and Intramembranous Ossification

Here, we present a protocol of adult mouse distal terminal phalanx (P3) amputation, a procedurally simple and reproducible mammalian model of epimorphic regeneration, which involves blastema formation and intramembranous ossification analyzed by fluorescence immunohistochemistry and sequential in-vivo microcomputed tomography (&#956;CT). Mammalian regeneration is restricted to amputations transecting the distal region of the terminal phalanx (P3); digits amputated at more proximal levels fail to regenerate and undergo fibrotic healing and scar formation. The regeneration response is mediated by the formation of a proliferative blastema, followed by bone regeneration via intramembranous ossification to restore the amputated skeletal length. P3 amputation is a preclinical model to investigate epimorphic regeneration in mammals, and is a powerful tool for the design of therapeutic strategies to replace fibrotic healing with a successful regenerative response. Our protocol uses fluorescence immunohistochemistry to 1) identify early-and-late blastema cell populations, 2) study revascularization in the context of regeneration, and 3) investigate intramembranous ossification without the need for complex bone stabilization devices. We also demonstrate the use of sequential in vivo &#956;CT to create high resolution images to examine morphological changes after amputation, as well as quantify volume and length changes in the same digit over the course of regeneration. We believe this protocol offers tremendous utility to investigate both epimorphic and tissue regenerative responses in mammals.

Here, we present a protocol of adult mouse terminal phalanx amputation to investigate mammalian blastema formation and intramembranous ossification, analyzed by fluorescent immunohistochemistry and sequential in-vivo microcomputed tomography.

Yetişkin fare basamak amputasyon ve rejenerasyonu: Mammalin Blastema oluşumu ve Intramembranous ossifikasyon araştırmak için basit bir model

Here, we present a protocol of adult mouse distal terminal phalanx (P3) amputation, a procedurally simple and reproducible mammalian model of epimorphic ...

A Simple Critical-sized Femoral Defect Model in Mice

While bone has a remarkable capacity for regeneration, serious bone trauma often results in damage that does not properly heal. In fact, one tenth of all limb bone fractures fail to heal completely due to the extent of the trauma, disease, or age of the patient. Our ability to improve bone regenerative strategies is critically dependent on the ability to mimic serious bone trauma in test animals, but the generation and stabilization of large bone lesions is technically challenging. In most cases, serious long bone trauma is mimicked experimentally by establishing a defect that will not naturally heal. This is achieved by complete removal of a bone segment that is larger than 1.5 times the diameter of the bone cross-section. The bone is then stabilized with a metal implant to maintain proper orientation of the fracture edges and allow for mobility. 
Due to their small size and the fragility of their long bones, establishment of such lesions in mice are beyond the capabilities of most research groups. As such, long bone defect models are confined to rats and larger animals. Nevertheless, mice afford significant research advantages in that they can be genetically modified and bred as immune-compromised strains that do not reject human cells and tissue.
Herein, we demonstrate a technique that facilitates the generation of a segmental defect in mouse femora using standard laboratory and veterinary equipment. With practice, fabrication of the fixation device and surgical implantation is feasible for the majority of trained veterinarians and animal research personnel. Using example data, we also provide methodologies for the quantitative analysis of bone healing for the model.

Animal models are frequently employed to mimic serious bone injury in biomedical research. Due to their small size, establishment of stabilized bone lesions in mice are beyond the capabilities of most research groups. Herein, we describe a simple method for establishing and analyzing experimental femoral defects in mice.

Farelerde Basit Kritik ölçekli Femoral Hata Modeli

While bone has a remarkable capacity for regeneration, serious bone trauma often results in damage that does not properly heal. In fact, one tenth of all ...

Establishment of a Segmental Femoral Critical-size Defect Model in Mice Stabilized by Plate Osteosynthesis

The use of tissue-engineered bone constructs is an appealing strategy to overcome drawbacks of autografts for the treatment of massive bone defects. As a model organism, the mouse has already been widely used in bone-related research. Large diaphyseal bone defect models in mice, however, are sparse and often use bone fixation which fills the bone marrow cavity and does not provide optimal mechanical stability. The objectives of the current study were to develop a critical-size, segmental, femoral defect in nude mice. A 3.5-mm mid-diaphyseal femoral ostectomy (approximately 25% of the femur length) was performed using a dedicated jig, and was stabilized with an anterior located locking plate and 4 locking screws. The bone defect was subsequently either left empty or filled with a bone substitute (syngenic bone graft or coralline scaffold). Bone healing was monitored noninvasively using radiography and in vivo micro-computed-tomography and was subsequently assessed by ex vivo micro-computed-tomography and undecalcified histology after animal sacrifice, 10 weeks postoperatively. The recovery of all mice was excellent, a full-weight-bearing was observed within one day following the surgical procedure. Furthermore, stable bone fixation and consistent fixation of the implanted materials were achieved in all animals tested throughout the study. When the bone defects were left empty, non-union was consistently obtained. In contrast, when the bone defects were filled with syngenic bone grafts, bone union was always observed. When the bone defects were filled with coralline scaffolds, newly-formed bone was observed in the interface between bone resection edges and the scaffold, as well as within a short distance within the scaffold. 
The present model describes a reproducible critical-size femoral defect stabilized by plate osteosynthesis with low morbidity in mice. The new load-bearing segmental bone defect model could be useful for studying the underlying mechanisms in bone regeneration pertinent to orthopaedic applications.

Although mouse models are invaluable tools for bone tissue engineering, models of long bone defects are sparse. This need motivated development of the present protocol which uses a locking plate with four screws and a dedicated jig to perform and stabilize a reproducible, femoral, critical-size defect with low morbidity.

Farelerde bir Segmental Femoral Kritik boyutlu Defekt Modelinde kurulması Plaka Osteosentez tarafından Stabilize

The use of tissue-engineered bone constructs is an appealing strategy to overcome drawbacks of autografts for the treatment of massive bone defects. As a ...

A Mouse Model of Orthopedic Surgery to Study Postoperative Cognitive Dysfunction and Tissue Regeneration

Surgery is commonly used to improve and maintain quality of life. Unfortunately, in vulnerable patients such as the elderly, complications may occur and significantly diminish the outcome. Indeed, after routine orthopedic surgery to repair a fracture, as many as 50% of elderly patients suffer from neurologic complications like delirium. Also, the capacity to heal and regenerate tissue after surgery decreases with age, and can impact the quality of fracture repair and even osseous integration of implants. Thus, a better understanding of mechanisms that drive these age-dependent changes could provide strategic targets to minimize risk for such complications and optimize outcomes. Here, we introduce a clinically relevant mouse model of tibial fracture. The postoperative changes in these mice mimic some of the cognitive impairments commonly observed after routine orthopedic surgery in humans. Briefly, an incision is performed in the right hind limb under strictly aseptic conditions. Muscles are disassociated, and a 0.38-mm stainless steel pin is inserted into the upper crest of the tibia, inside the intramedullary canal. Osteotomy is then performed, and the wound is stapled. We have used this model to investigate the effects of surgical trauma on postoperative neuroinflammation and behavioral changes. By applying this fracture model in combination with parabiosis, a surgical model in which 2 mice are anastomosed, we have studied cells and secreted factors that systemically rejuvenate organ function and tissue regeneration after injury. By following our step-by-step protocol, these models can be reproduced with high fidelity, and can be adapted to interrogate many biologic pathways that are altered by surgical trauma.

This protocol describes a mouse model of orthopedic surgery that has been used to study mechanisms of postoperative neuroinflammation and behavioral changes, and when combined with parabiosis, to study tissue regeneration during aging.

Ameliyat sonrası bilişsel işlev bozukluğu ve doku rejenerasyonu çalışmaya ortopedik cerrahi bir fare modeli

Surgery is commonly used to improve and maintain quality of life. Unfortunately, in vulnerable patients such as the elderly, complications may occur and ...

Partial Heterotopic Hindlimb Transplantation Model in Rats

Vascularized composite allotransplantations (VCA) represent the most advanced reconstruction option for patients without autologous surgical possibilities after a complex tissue defect. Face and hand transplantations have changed disfigured patients' lives, giving them a new aesthetic and functional social organ. Despite promising outcomes, VCA is still underperformed due to life-long immunosuppression comorbidities and infectious complications. The rat is an ideal animal model for in vivo studies investigating immunological pathways and graft rejection mechanisms. Rats are also widely used in novel composite tissue graft preservation techniques, including perfusion and cryopreservation studies. Models used for VCA in rats must be reproducible, reliable, and efficient with low postoperative morbidity and mortality. Heterotopic limb transplantation procedures fulfill these criteria and are easier to perform than orthotopic limb transplants. Mastering rodent microsurgical models requires solid experience in microsurgery and animal care. Herein is reported a reliable and reproducible model of partial heterotopic osteomyocutaneous flap transplantation in rats, the postoperative outcomes, and the means of prevention of potential complications.

This paper presents a partial heterotopic osteomyocutaneous flap transplantation protocol in rats and its potential outcomes in the mid-term follow-up.

Sıçanlarda Kısmi Heterotopik Hindlimb Transplantasyon Modeli

Vascularized composite allotransplantations (VCA) represent the most advanced reconstruction option for patients without autologous surgical possibilities ...

İmmünoloji ve Enfeksiyon

A Mouse Model of Mechanotransduction-driven, Human-like Hypertrophic Scarring

Hypertrophic scarring (HTS) is an abnormal process of wound healing that results in excessive scar tissue formation. Over the past decade, we have demonstrated that mechanotransduction&#8212;the conversion of mechanical stimuli into cellular responses&#8212;drives excessive fibrotic scar healing. A mouse model to assess human-like hypertrophic scarring would be an essential tool for examining various therapeutics and their ability to reduce scarring and improve healing. Specifically, our laboratory has developed a murine wound model that increases mechanical strain to promote human-like HTS. This&#160;protocol utilizes biomechanical loading devices, made from modified 13 mm palatal expanders, whose arms are placed on either side of the incision and distracted incrementally apart in order to apply continuous tension across the wound bed during healing. Over nearly two decades of use, this model has been significantly advanced to improve efficacy and reproducibility. Using the murine HTS model, significant dermal fibrotic scars can be induced to be histologically comparable to human hypertrophic scars. This murine model provides an environment to develop biologics involved in the treatment of HTS and mechanotransduction-related conditions such as foreign body response.

This protocol will explain how to establish a hypertrophic scarring murine model that increases mechanotransduction signaling to simulate human-like scarring. This method involves increasing mechanical tension across a healing incision in a mouse and using a specialized device to create reproducible, excessive scar tissue for detailed histological and bioinformatic analyses.

Hypertrophic scarring (HTS) is an abnormal process of wound healing that results in excessive scar tissue formation. Over the past decade, we have ...

Biyomühendislik

A Murine Model of a Burn Wound Reconstructed with an Allogeneic Skin Graft

Trivial superficial wounds heal without complications by primary intention. Deep wounds, such as full thickness burns, heal by secondary intention and require surgical debridement and skin grafting. Successful integration of the donor graft into a recipient wound bed depends on timely recruitment of immune cells, robust angiogenic response and new extracellular matrix formation. The development of novel therapeutic agents, which target some key processes involved in wound healing, are hindered by the lack of reliable preclinical models with optimized objective assessment of wound closure. Here, we describe an inexpensive and reproducible model of experimental full thickness burn wound reconstructed with an allogeneic skin graft. The wound is induced on the dorsum surface of anaesthetized inbred wild type mice from the BALB/C and SKH1-Hrhr backgrounds. The burn is produced using a brass template measuring 10 mm in diameter, which is preheated to 80 &#176;C and delivered at a constant pressure for 20 s. Burn eschar is excised 24 hours after the injury and replaced with a full thickness graft harvested from the tail of a genetically similar donor mouse. No specialized equipment is required for the procedure and surgical techniques are straightforward to follow. The method may be effortlessly implemented and reproduced in most research settings. Certain limitations are associated with the model. Due to technical difficulties, the harvest of thinner split thickness skin grafts is not possible. The surgical method we describe here allows for the reconstruction of burn wounds using full thickness skin grafts. It may be used to carry out preclinical therapeutic testing.

The aim of this study was to develop a murine model of burn wound healing. A thermal burn was induced on the dorsal skin of mice using a preheated brass template. Burned tissue was debrided and overlaid with a skin graft harvested from the tail of a genetically similar donor mouse.

Allojenik Deri Grefti ile Yeniden Yapılandırılan Yanık Yarasının Murine Modeli

Trivial superficial wounds heal without complications by primary intention. Deep wounds, such as full thickness burns, heal by secondary intention and ...