Biz dikilmesi ile ilgili yardım için EC Liao teşekkür eder, ve R. Ethier ve zebrafish bakımı için L. Gyr. AJD Harvard Kök Hücre Enstitüsü, Amerikan Nefroloji Derneği ve NIH / NIDDK (P50DK074030) tarafından desteklenmiştir. CQD Massachusetts Genel Hastanesi Tıbbi Keşif-Fon tarafından desteklenmiştir.

1. Transgenik olmayan alıcı balık klima. <ol><li> Transplantasyon için sistemin en büyük erkek balık seçin. </li><li> Yaklaşık 3 dakika boyunca ya da yüzme, ama kalbim duracak gibi değil uzun durur kadar% 0.02 Tricaine balık (pH 7) yerleştirin. </li><li> Anestezi balık tezgah üstüne nemli bir kağıt havlu üzerine koyun. </li><li> Su 20 uL gentamisin 40 ug balık intraperitoneal boşluğuna enjekte etmek için bir insülin şırınga iğnesi kullanın. Böbrek yenileme çalışmaları için, bu adım için uygun bir ortam gelişmiş engraftman indükleyici için önemlidir. </li><li> Balık kurtarma için sistem su içine geri koyun. </li><li> Balık uysal ve titreşim gibi dış uyarana karşı çok duyarlı olabilir. Kurtarma 3 saat sonra, 25 gri gama ışınlama ile balık davranın. </li><li> Nakli için önce gıda olmadan 3 gün boyunca balık sistem geri koyun. </li></ol> 2. Progenitör donör hücrelerinin hazırlanması genetik bir floresan işaretleyici (EGFP veya mCherry) ile etiketlenir. <ol><li> Sadece cerrahi işlem öncesinde, nakledilen donör hücreleri hazırlamak ve buz üzerinde saklayın. </li><li> Böbrek ve hematopoietik progenitör hücreler içeren transgenik hattı, böbrek çalışmaları için Tg (EGFP cdh17) tüm böbrek iliği hücreleri kullanır. Bu progenitör hücrelerin genetik olarak etiketlenir ve renal epitel hücrelerin içine sokmak ve ayırt EGFP ifade edecektir. Angioblast atalarıdır nakli için: hematopoietik kök hücre veya Tg (EGFP fli1a): etiketli progenitör hücreler diğer türleri de Tg (EGFP SCL) gibi, kullanılan olabilir. </li><li> 5 dakika boyunca% 0.2 Tricaine koyarak 3 yetişkin transgenik balık Euthanize. </li><li> Ventral kenarı boyunca bir orta hat kesi yapmak için baş ve kuyruk ve diseksiyon makas kaldırmak için steril bir jilet kullanın. </li><li> Stereoskop altında, cımbız ile kesesi de dahil olmak üzere vücut boşluğunda iç organların tümünü kaldırmak. Boşluğunun dorsal duvara bağlı bir düz ve pigmentli organ olan böbrek, kaldırmak için değil dikkatli olun. </li><li> Sonra, dorsal duvarından böbrek incelemek ve 300 uL% 2 fetal buzağı serumu (1X PBS / 2% FCS) ile desteklenmiş soğuk fosfat tamponu salin içeren bir 1.5 mL santrifüj tüpü içine yerleştirin. </li><li> Homojenize olana kadar kesme böbrek havaneli kullanın. </li><li> 50 ml Falcon tüp içinde 40 UM hücre süzgeç yerleştirin ve gevşek hücreleri Falcon tüp içine süzülmeye sağlayan hücre süzgeç üstüne hücre çözümü transfer. </li><li> Havaneli hafifçe smear, hücreleri daha yukarı kırmak için süzgeç sol büyük doku parçaları kullanın. </li><li> Falcon tüp hücre çözümü bırakın ve süzgeç artık hücreleri toplamak için 1X PBS / 2% FCS 1.2 mL süzgeç yıkayın. </li><li> 5 dakika boyunca 300 ° C RCF az 4 hücre çözümü yeni bir 1.5 mL tüp ve santrifüj içine aktarın. </li><li> Hücre pelletini 1,5 mL 1X PBS / 2% FCS ile yıkayın ve yapışkan hücreleri kümeleri filtre ve tekrar santrifüj yeni bir süzgeç üzerinden geçmek. </li><li> 1X PBS /% 2 FCS 200 uL hücre pelletini tekrar bir PCR tüpüne transfer. </li><li> PCR tüp (4 ° C, 300 RCF, 1 dak.) Santrifüj ve süpernatant en çıkarmak. </li><li> 2-5 uL son hacim ve buz üzerinde saklamak için artık süpernatant hücrelerin tekrar </li><li> Nihai hücresel verimi böbrek başına yaklaşık 2 milyon hücre olmalıdır. </li><li> Bir hemasitometre hücrelerinin sayısını ve 5 konsantrasyonu ayarlanarak uL ortalama x 10 5 hücre. </li></ol> 3. Hamilton enjektöre hücre çözümü yükleyin. <ol><li> Hamilton şırınga 3 kez steril su ile durulayın. </li><li> 3 kez etanol% 75 ile şırınga durulayın. </li><li> 1X PBS /% 2 FCS 3 kez ile tekrar şırınga durulayın. </li><li> Sonra 1 uL hücre çözüm enjeksiyondan hemen önce yaklaşık 5 x 10 5 hücre içeren şırınga yükleyin. </li></ol> 4. Progenitör hücrelerin doğrudan böbrek transplantasyonu. <ol><li> Balık hareket durdu, yaklaşık 3 dakika kadar veya değil, çok uzun kalp durur yenerek% 0.02 Tricaine klimalı alıcı balık anestezisi. </li><li> Bir stereomikroskop altında, nakledilen tarafı kapalı kurutmak üzere, sol, ventral tarafına doğru kafa ile bir kağıt havlu üzerine balık yatıyordu. </li><li> Sonra, kurutulmuş yan maruz balık döndürün. </li><li> Steril cımbız kullanarak, solungaçları hemen arka bölgedeki ölçekler çıkarın. </li><li> Cımbız ile doku stabilize bir neşter ile orta hatta bu alanda bir 1 cm lateral insizyon olun. </li><li> Yeterince derin kesi yapmak için devam ederken, cımbız kullanarak, doku maruzbaş böbrek ortaya çıkarmak için. </li><li> Böbrek görselleştirme engeller çok fazla kanama varsa, balık euthenize ve başka bir alıcı balık baştan başlamak. </li><li> Baş böbrek maruz doku açık meraklı iken, doğrudan başkanı böbrek hücreli çözüm 1 uL enjekte edilir. </li><li> Sonra, doku enjekte edilen hücrelerin sızmasını önlemek için yerine geri döner, böylece aynı zamanda şırınga iğnesi alındığını, cımbız bırakın. </li><li> Sürücü ve kesi her tarafında kas yoluyla delmek bir iğne ile dikiş iğnesi tutun. </li><li> 2 knot Kravat ve aşırı sütür kesti. Sadece tek bir sütür 1 cm&#39;lik kesi için gereklidir. </li><li> Balık sakinleştirici bir analjezik etki sağlamak için 5 saat Tricaine bir milyon kişi başına 10 parça içeren balık suda balık yerleştirin. </li><li> Balık, normal beslenmeye ile kurtarma için sistem geri yerleştirin. </li><li> Iyileşme 7-18 gün sonra, biz balık incelemek ve böbrek progenitör hücrelerin canlı EGFP floresan engraftman analiz. </li></ol> 5. Temsilcisi Sonuçlar: Nakli genel strateji Şekil 1&#39;de gösterilmiştir. Böbrek çalışmaları için, böbrek disseke ve EGFP floresan analiz. Aşı ve böbrek progenitör hücrelerin farklılaşması, yedi gün transplantasyon sonrası gibi erken olarak tespit edilmiştir. Bu EGFP birden çok küme + böbrek epitel hücreleri (Şekil 2) varlığı açıktır. Transplantasyon sonrası 18 gün, biz, donör hücreleri yeni böbrek dokusu oluşur (Şekil 3) olduğunu belirten bir ortalama 24 EGFP + nefron algılar. Uzun vadeli engraftman göstermek için, bir alıcı balık 59 gün transplantasyon sonrası disseke (Şekil 4). Bu balık böbrek progenitör hücrelerin göç olduğunu öne sürerek, uzak bölgelere (beyaz ok başları) birden fazla nefron ek olarak enjeksiyon yerinde (kırmızı ok ucu) birçok nefron vardı. Bu teknik hücreleri, engraftman algılamak için yaklaşık üç ay sürer kalp, üzerinden dolaşıma enjekte edilir göre daha hızlı ve daha verimli olur. <img src="/files/ftp_upload/2725/2725fig1.jpg" alt="Şekil 1"/> Şekil 1. Nakli Sigara transgenik alıcı balık Genel düzeni nakledilen hücrelerin bağışıklık ret bastırmak için ışınlanmış. Üç gün sonra, balık ve donör progenitör hücrelerin kanadında bir kesi yapılır maruz kafa böbrek içine enjekte edilir. Kesi geri kurtarma için sistemin içine yerleştirilen bir dikiş ve balık ile kapalıdır. Daha sonraki zaman noktalarında alıcı balık Böbrekler disseke ve engraftman ve progenitör aktivitesi için analiz edilir. <img src="/files/ftp_upload/2725/2725fig2.jpg" alt="Şekil 2"/> Şekil 2. Aşı yedi gün sonra progenitör hücrelerin. Böbrek progenitör hücrelerin Aşı EGFP + böbrek epitel hücreleri kümeleri varlığı (büyütülmüş görünümü içerlek) tarafından belirlenen, yedi gün transplantasyon sonrası baş böbrek enjekte edilen tarafta tespit edilmiştir . <img src="/files/ftp_upload/2725/2725fig3.jpg" alt="Şekil 3"/> Şekil 3. 18 gün sonra progenitör hücrelerin Aşı transplantasyon sonrası 18 gün sonra, ortalama 24 EGFP + donör kaynaklı nefron (insert - bireysel EGFP + nefron büyütülmüş görüntüsü) algılamak. <img src="/files/ftp_upload/2725/2725fig4.jpg" alt="Şekil 4"/> Şekil 4. 59 gün sonra Aşı ve progenitör hücrelerin göç, hatta 59 gün sonra (kırmızı ok başı), uzun progenitör hücrelerin naklinden sonra engraftman algılamak için devam etti . Bu daha sonraki zaman noktasında, donör kaynaklı nefron, progenitör hücre göçü ile tutarlı enjeksiyonu (beyaz ok başları) sitesi, uzakta siteleri tespit edilir.

<ol>
	<li>Hopkins, C., Li, J., Rae, F., Little, M. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Stem+cell+options+for+kidney+disease.">Stem cell options for kidney disease.</a> The Journal of Pathology. 217, 265-281 (2009).</li><li>Brittijn, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Zebrafish+development+and+regeneration:+new+tools+for+biomedical+research.">Zebrafish development and regeneration: new tools for biomedical research.</a> Int J Dev Biol. 53, 835-850 (2009).</li><li>Traver, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Effects+of+lethal+irradiation+in+zebrafish+and+rescue+by+hematopoietic+cell+transplantation.">Effects of lethal irradiation in zebrafish and rescue by hematopoietic cell transplantation.</a> Blood. 104, 1298-1305 (2004).</li></ol>

Rejeneratif çalışmaları için çok önemlidir hücre nakli teknikleri ve kök hücre aktivitesini ölçmek için altın standart assay. Burada, kök ve progenitör hücre aktivitesini belirlemek için doğrudan yetişkin zebrafish böbrek hücre nakli için bir yöntem raporu. Bu prosedür, baş böbrek, böbrek doğrudan hücre enjeksiyonu ile takip maruz, kas yoluyla bir kesi yapılmasını gerektirir. Kesi tek bir dikiş ile kapatılır ve işletilen balık hayatta kalma oranı% 90-100 var. Deneylerde, engrafted böbrek progenitör hücreleri nakledilen balık yedi gün transplantasyon sonrası% 80-100 tespit edilir. Bu tekniğin bir sınırlama kesi neşter tarafından kolayca rüptüre olabilir dorsal aorta, yakın olmasıdır. Ancak, bir zamanlar hakim, kanama oranı yüzde birden daha az olabilir. Bizim yöntemi böbrek gibi küçük moleküller diğer hücre tipleri (kan, stromal ya da vasküler) sunmak için adapte edilebilir. Bu tekniğin geliştirilmesi önceden rejeneratif çalışmalarına yardımcı ve in vivo olarak değerlendirilmesi gereken kök ve progenitör hücre potansiyeli izin verecektir.

<table border="1"><tbody><tr><th> Reaktifin Adı </th><th> Şirket </th><th> Katalog numarası </th></tr><tr><td> Insülin enjektörü iğne (28 ölçü) </td><td> Becton Dickinson </td><td> 329461 </td></tr><tr><td> Hücre süzgeç (40 UM) </td><td> Becton Dickinson </td><td> 352340 </td></tr><tr><td> Tricaine </td><td> Sigma </td><td> A5040 </td></tr><tr><td> Hamilton şırınga (26 göstergesi) </td><td> Sigma </td><td> 20734 </td></tr><tr><td> Ethilon sütür (boyut 9-0) </td><td> Ethicon </td><td> 2819G </td></tr></tbody></table>

transplantation of cells directly into the kidney of adult zebrafish

Rejeneratif tıp hasarlı dokuların içine kök ve progenitör hücrelerin nakli, kronik hastalıkları 1 geniş bir yelpazede tedavi etme potansiyeline sahiptir . Ancak, bu yapılara erişmek için cerrahi yöntemler geliştirme ihtiyacı gerektiren birçok organın, kolay erişilebilir değildir. Bu video makalede, biz doğrudan rejenerasyon çalışması için bir popüler model ve hastalık 2 yetişkin zebrafish, böbrek hücre nakli için bir yöntem açıklanmaktadır. Alıcı balık, enjekte edilen hücrelerin 3 bağışıklık ret bastırmak için ışınlama tarafından ön koşuluna bağlıdır . Biz baş böbrek organ doğrudan hücre enjeksiyonu ile takip balık kanadını lateral insizyonu, nasıl maruz göstermektedir. Herhangi bir hücre tabanlı rejeneratif tedavide altın standart - böbrek ve hematopoietik öncüleri oluşan karışık bir nüfus oluşturan floresan etiketli tüm böbrek iliği hücreleri kullanarak, nefron atalarıdır yeni böbrek dokusu içine sokmak ve ayırt edebilirsiniz olduğunu göstermektedir. Bu teknik, böbrek gibi diğer iç organları veya progenitör kök hücre ve / veya küçük moleküller saflaştırılmış ve rejeneratif tıp öğrenimi için çok yönlü bir model olarak daha zebrafish artırır sunmak için adapte edilebilir.

Watch this Scientific Journal Video about Transplantation of Cells Directly into the Kidney of Adult Zebrafish at JoVE.com

Transplantation of Cells Directly into the Kidney of Adult Zebrafish

Hücre nakli, doku rejenerasyonu çalışmak için ve hücre tabanlı tedaviler hastalığın geliştirilmesi için önemli bir tekniktir. Biz burada yetişkin Zebra balığı balık böbrek doğrudan genetik etiketli hücrelerinin nakli izin veren bir mikrocerrahi tekniğini göstermektedir.

Doğrudan Yetişkin Zebra balığı Böbrek Hücre Nakli

Regenerative medicine based on the transplantation of stem or progenitor cells into damaged tissues has the potential to treat a wide range of chronic ...

transplantation-of-cells-directly-into-the-kidney-of-adult-zebrafish

Research

JoVE Journal

Biology

15.0K Görüntüleme.  Massachusetts General Hospital. Hücre nakli, doku rejenerasyonu çalışmak için ve hücre tabanlı tedaviler hastalığın geliştirilmesi için önemli bir tekniktir. Biz burada yetişkin Zebra balığı balık böbrek doğrudan genetik etiketli hücrelerinin nakli izin veren bir mikrocerrahi tekniğini göstermektedir.

Video: Transplantation of Cells Directly into the Kidney of Adult Zebrafish

Transplantation of Whole Kidney Marrow in Adult Zebrafish

Hematopoietic stem cells (HSC) are a rare population of pluripotent cells that maintain all the differentiated blood lineages throughout the life of an organism. The functional definition of a HSC is a transplanted cell that has the ability to reconstitute all the blood lineages of an irradiated recipient long term. This designation was established by decades of seminal work in mammalian systems. Using hematopoietic cell transplantation (HCT) and reverse genetic manipulations in the mouse, the underlying regulatory factors of HSC biology are beginning to be unveiled, but are still largely under-explored. Recently, the zebrafish has emerged as a powerful genetic model to study vertebrate hematopoiesis. Establishing HCT in zebrafish will allow scientists to utilize the large-scale genetic and chemical screening methodologies available in zebrafish to reveal novel mechanisms underlying HSC regulation. In this article, we demonstrate a method to perform HCT in adult zebrafish. We show the dissection and preparation of zebrafish whole kidney marrow, the site of adult hematopoiesis in the zebrafish, and the introduction of these donor cells into the circulation of irradiated recipient fish via intracardiac injection. Additionally, we describe the post-transplant care of fish in an "ICU" to increase their long-term health. In general, gentle care of the fish before, during, and after the transplant is critical to increase the number of fish that will survive more than one month following the procedure, which is essential for assessment of long term (&lt;3 month) engraftment. The experimental data used to establish this protocol will be published elsewhere. The establishment of this protocol will allow for the merger of large-scale zebrafish genetics and transplant biology.

In this article, we demonstrate a method to perform HCT in adult zebrafish.

Yetişkin Zebra balığı Tüm Böbrek İliği Nakli

Hematopoietic stem cells (HSC) are a rare population of pluripotent cells that maintain all the differentiated blood lineages throughout the life of an ...

Biyoloji

Transplantation of Pancreatic Islets Into the Kidney Capsule of Diabetic Mice

Our protocol was developed to cleanly and easily deliver islets or cells under the kidney capsule of diabetic or normal mice. We found that it was easier to concentrate the islets or cells into pellets in the final delivery tubing (PE50) used to transplant the cells under the kidney capsule. This technique provides both speed and ease while reducing any undue stress to the cells or to the mouse.

Loading: Settled, hand picked, islets or pelleted cells are carefully aspirated off the bottom of a 1.5 mL microcentrifuge tube using a p200 pipetteman and a straight, thin-wall pipette tip. A length of PE50 tubing is attached to the pipette tip using a small silicone adapter tubing. Cells are allowed to settle, in the tip, and then are transferred to the PE50 tubing by slowly dialing the pipetteman. Once the cells are near the end of the PE50 tubing, a kink is made and the silicone adaptor tubing is placed over the kink. The PE50 tubing is transferred to a 15 mL conical containing a cut 5 mL pipet, and the PE50 tubing is taped over the side of the 5 mL pipet to prevent curling during centrifuging. Cells are allowed to reach 1,000 rpm and stopped.
Transplantation: Recipient mice are anesthetized, shaved, and cleaned. A small incision is made on the left flank of the mouse and the kidney is exposed. The kidney, fat, and tissue are kept moist with normal saline swab. The distal end of the PE50 is attached to a Hamilton screw drive syringe, containing a pipette tip, using the silicone adaptor tubing. A small nick is made on the right flank side of the kidney, not too large nor too deep. The beveled end of the PE50 tubing, nearest the cells, is carefully placed under the capsule, the tubing is moved around gently to make space while swabbing normal saline; a dry capsule can tear easily. A small air bubble is delivered under the capsule by slowly dialing the syringe screw drive. Islets are then slowly delivered behind the air bubble. Once the islets have been delivered kidney homeostasis is maintained and the knick is cauterized with low heat. The kidney is placed back into the cavity and the peritoneum and skin are sutured and stapled. Mice are immediately treated with Flunixin and Buprenorphine s.q. and placed in a cage on a heating pad.

Our protocol was developed to cleanly and easily deliver islets or cells under the kidney capsule of mice. Cells are concentrated into pellets in the final tubing used for transplanting the cells under the kidney capsule. The ease of this technique reduces stress to the cells and the mouse.

Diyabetik Fare Böbrek Kapsül içine, Pankreas Islets Nakli

Our protocol was developed to cleanly and easily deliver islets or cells under the kidney capsule of diabetic or normal mice.  We found that it was easier ...

Lens Transplantation in Zebrafish and its Application in the Analysis of Eye Mutants

The lens plays an important role in the development of the optic cup[1,2]. Using the zebrafish as a model organism, questions regarding lens development can be addressed. The zebrafish is useful for genetic studies due to several advantageous characteristics, including small size, high fecundity, short lifecycle, and ease of care. Lens development occurs rapidly in zebrafish. By 72 hpf, the zebrafish lens is functionally mature [3]. Abundant genetic and molecular resources are available to support research in zebrafish. In addition, the similarity of the zebrafish eye to those of other vertebrates provides basis for its use as an excellent animal model of human defects[4-7]. Several zebrafish mutants exhibit lens abnormalities, including high levels of cell death, which in some cases leads to a complete degeneration of lens tissues [8]. To determine whether lens abnormalities are due to intrinsic causes or to defective interactions with the surrounding tissues, transplantation of a mutant lens into a wild-type eye is performed. Using fire-polished metal needles, mutant or wild-type lenses are carefully dissected from the donor animal, and transferred into the host. To distinguish wild-type and mutant tissues, a transgenic line is used as the donor. This line expresses membrane-bound GFP in all tissues, including the lens. This transplantation technique is an essential tool in the studies of zebrafish lens mutants.

Lens development involves interactions with other tissues. Several zebrafish eye mutants are characterized by an abnormally small lens size. Here we demonstrate a lens transplantation experiment to determine whether this phenotype is due to intrinsic causes or defective interactions with tissues that surround the lens.

Zebra balığı Lens Nakli ve Göz Mutants Analizi Uygulaması

The lens plays an important role in the development of the optic cup[1,2]. Using the zebrafish as a model organism, questions regarding lens development ...

Dissection of Organs from the Adult Zebrafish

Over the last 20 years, the zebrafish has become a powerful model organism for understanding vertebrate development and disease.  Although experimental analysis of the embryo and larva is extensive and the morphology has been well documented, descriptions of adult zebrafish anatomy and studies of development of the adult structures and organs, together with techniques for working with adults are lacking. The organs of the larva undergo significant changes in their overall structure, morphology, and anatomical location during the larval to adult transition.  Externally, the transparent larva develops its characteristic adult striped pigment pattern and paired pelvic fins, while internally, the organs undergo massive growth and remodeling.  In addition, the bipotential gonad primordium develops into either testis or ovary.  This protocol identifies many of the organs of the adult and demonstrates methods for dissection of the brain, gonads, gastrointestinal system, heart, and kidney of the adult zebrafish. The dissected organs can be used for in situ hybridization, immunohistochemistry, histology, RNA extraction, protein analysis, and other molecular techniques.  This protocol will assist in the broadening of studies in the zebrafish to include the remodeling of larval organs, the morphogenesis of organs specific to the adult and other investigations of the adult organ systems.

This protocol describes a procedure for identifying and dissecting organs from the adult zebrafish.

Yetişkin Zebra balığı Organları diseksiyonu

Over the last 20 years, the zebrafish has become a powerful model organism for understanding vertebrate development and disease.  Although experimental ...

Intraperitoneal Injection into Adult Zebrafish

A convenient method for chemically treating zebrafish is to introduce the reagent into the tank water, where it will be taken up by the fish. However, this method makes it difficult to know how much reagent is absorbed or taken up per fish. Some experimental questions, particularly those related to metabolic studies, may be better addressed by delivering a defined quantity to each fish, based on weight. Here we present a method for intraperitoneal (IP) injection into adult zebrafish. Injection is into the abdominal cavity, posterior to the pelvic girdle. This procedure is adapted from veterinary methods used for larger fish. It is safe, as we have observed zero mortality. Additionally, we have seen bleeding at the injection site in only 5 out of 127 injections, and in each of those cases the bleeding was brief, lasting several seconds, and the quantity of blood lost was small. Success with this procedure requires gentle handling of the fish through several steps including fasting, weighing, anesthetizing, injection, and recovery. Precautions are required to minimize stress throughout the procedure. Our precautions include using a small injection volume and a 35G needle. We use Cortland salt solution as the vehicle, which is osmotically balanced for freshwater fish. Aeration of the gills is maintained during the injection procedure by first bringing the fish into a surgical plane of anesthesia, which allows slow operculum movements, and second, by holding the fish in a trough within a water-saturated sponge during the injection itself. We demonstrate the utility of IP injection by injecting glucose and monitoring the rise in blood glucose level and its subsequent return to normal. As stress is known to increase blood glucose in teleost fish, we compare blood glucose levels in vehicle-injected and non-injected adults and show that the procedure does not cause a significant rise in blood glucose.

We demonstrate intraperitoneal injection into adult zebrafish. We use a 10 &mu;l NanoFil microsyringe controlled by a Micro4 controller and UltraMicroPump III. This demonstration includes the use of cold water as an anesthetic.

Yetişkin Zebra balığı içine intraperitoneal enjeksiyon

A convenient method for chemically treating zebrafish is to introduce the reagent into the tank water, where it will be taken up by the fish. However, ...

Quantifying the Frequency of Tumor-propagating Cells Using Limiting Dilution Cell Transplantation in Syngeneic Zebrafish

Self-renewing cancer cells are the only cell types within a tumor that have an unlimited ability to promote tumor growth, and are thus known as tumor-propagating cells, or tumor-initiating cells. It is thought that targeting these self-renewing cells for destruction will block tumor progression and stop relapse, greatly improving patient prognosis1. The most common way to determine the frequency of self-renewing cells within a tumor is a limiting dilution cell transplantation assay, in which tumor cells are transplanted into recipient animals at increasing doses; the proportion of animals that develop tumors is used the calculate the number of self-renewing cells within the original tumor sample2, 3. Ideally, a large number of animals would be used in each limiting dilution experiment to accurately determine the frequency of tumor-propagating cells. However, large scale experiments involving mice are costly, and most limiting dilution assays use only 10-15 mice per experiment. 
Zebrafish have gained prominence as a cancer model, in large part due to their ease of genetic manipulation and the economy by which large scale experiments can be performed. Additionally, the cancer types modeled in zebrafish have been found to closely mimic their counterpart human disease4. While it is possible to transplant tumor cells from one fish to another by sub-lethal irradiation of recipient animals, the regeneration of the immune system after 21 days often causes tumor regression5. The recent creation of syngeneic zebrafish has greatly facilitated tumor transplantation studies 6-8. Because these animals are genetically identical, transplanted tumor cells engraft robustly into recipient fish, and tumor growth can be monitored over long periods of time. Syngeneic zebrafish are ideal for limiting dilution transplantation assays in that tumor cells do not have to adapt to growth in a foreign microenvironment, which may underestimate self-renewing cell frequency9, 10. Additionally, one-cell transplants have been successfully completed using syngeneic zebrafish8 and several hundred animals can be easily and economically transplanted at one time, both of which serve to provide a more accurate estimate of self-renewing cell frequency.
Here, a method is presented for creating primary, fluorescently-labeled T-cell acute lymphoblastic leukemia (T-ALL) in syngeneic zebrafish, and transplanting these tumors at limiting dilution into adult fish to determine self-renewing cell frequency. While leukemia is provided as an example, this protocol is suitable to determine the frequency of tumor-propagating cells using any cancer model in the zebrafish.

Limiting dilution cell transplantation assays are used to determine the frequency of tumor-propagating cells. This protocol describes a method for generating syngeneic zebrafish that develop fluorescently-labeled leukemia and details how to isolate and transplant these leukemia cells at limiting dilution into the peritoneal cavity of adult zebrafish.

Singenik Zebra balığı Tümör propaganda Hücreler Frekans miktarının sınırlandırılması Seyreltme Hücre Transplantasyonu

Self-renewing cancer cells are the only cell types within a tumor that have an unlimited ability to promote tumor growth, and are thus known as ...

Dissection of the Adult Zebrafish Kidney

Researchers working in the burgeoning field of adult stem cell biology seek to understand the signals that regulate the behavior and function of stem cells during normal homeostasis and disease states. The understanding of adult stem cells has broad reaching implications for the future of regenerative medicine1. For example, better knowledge about adult stem cell biology can facilitate the design of therapeutic strategies in which organs are triggered to heal themselves or even the creation of methods for growing organs in vitro that can be transplanted into humans1. The zebrafish has become a powerful animal model for the study of vertebrate cell biology2. There has been extensive documentation and analysis of embryonic development in the zebrafish3. Only recently have scientists sought to document adult anatomy and surgical dissection techniques4, as there has been a progressive movement within the zebrafish community to broaden the applications of this research organism to adult studies. For example, there are expanding interests in using zebrafish to investigate the biology of adult stem cell populations and make sophisticated adult models of diseases such as cancer5. Historically, isolation of the zebrafish adult kidney has been instrumental for studying hematopoiesis, as the kidney is the anatomical location of blood cell production in fish6,7. The kidney is composed of nephron functional units found in arborized arrangements, surrounded by hematopoietic tissue that is dispersed throughout the intervening spaces. The hematopoietic component consists of hematopoietic stem cells (HSCs) and their progeny that inhabit the kidney until they terminally differentiate8. In addition, it is now appreciated that a group of renal stem/progenitor cells (RPCs) also inhabit the zebrafish kidney organ and enable both kidney regeneration and growth, as observed in other fish species9-11. In light of this new discovery, the zebrafish kidney is one organ that houses the location of two exciting opportunities for adult stem cell biology studies. It is clear that many outstanding questions could be well served with this experimental system. To encourage expansion of this field, it is beneficial to document detailed methods of visualizing and then isolating the adult zebrafish kidney organ. This protocol details our procedure for dissection of the adult kidney from both unfixed and fixed animals.
Dissection of the kidney organ can be used to isolate and characterize hematopoietic and renal stem cells and their offspring using established techniques such as histology, fluorescence activated cell sorting (FACS)11,12, expression profiling13,14, and transplantation11,15. 
We hope that dissemination of this protocol will provide researchers with the knowledge to implement broader use of zebrafish studies that ultimately can be translated for human application.

The zebrafish kidney is home to both renal and hematopoietic adult stem/progenitor cells, and represents an outstanding opportunity to study these cell types and their progeny in a vertebrate model organism. Here, we demonstrate a detailed dissection procedure that enables the researcher to identify and surgically remove the adult zebrafish kidney, which can be used for applications such as cell isolation, transplantation, and expression studies of kidney and/or blood cell populations.

Yetişkin Zebra balığı Böbrek diseksiyonu

Researchers working in the burgeoning field of adult stem cell biology seek to understand the signals that regulate the behavior and function of stem ...

In vivo Electroporation of Morpholinos into the Adult Zebrafish Retina

Many devastating inherited eye diseases result in progressive and irreversible blindness because humans cannot regenerate dying or diseased retinal neurons. In contrast, the adult zebrafish retina possesses the robust ability to spontaneously regenerate any neuronal class that is lost in a variety of different retinal damage models, including retinal puncture, chemical ablation, concentrated high temperature, and intense light treatment 1-8. Our lab extensively characterized regeneration of photoreceptors following constant intense light treatment and inner retinal neurons after intravitreal ouabain injection 2, 5, 9. In all cases, resident M&uuml;ller glia re-enter the cell cycle to produce neuronal progenitors, which continue to proliferate and migrate to the proper retinal layer, where they differentiate into the deficient neurons. 
	We characterized five different stages during regeneration of the light-damaged retina that were highlighted by specific cellular responses. We identified several differentially expressed genes at each stage of retinal regeneration by mRNA microarray analysis 10. Many of these genes are also critical for ocular development. To test the role of each candidate gene/protein during retinal regeneration, we needed to develop a method to conditionally limit the expression of a candidate protein only at times during regeneration of the adult retina. 
	Morpholino oligos are widely used to study loss of function of specific proteins during the development of zebrafish, Xenopus, chick, mouse, and tumors in human xenografts 11-14. These modified oligos basepair with complementary RNA sequence to either block the splicing or translation of the target RNA. Morpholinos are stable in the cell and can eliminate or "knockdown" protein expression for three to five days 12. 
	Here, we describe a method to efficiently knockdown target protein expression in the adult zebrafish retina. This method employs lissamine-tagged antisense morpholinos that are injected into the vitreous of the adult zebrafish eye. Using electrode forceps, the morpholino is then electroporated into all the cell types of the dorsal and central retina. Lissamine provides the charge on the morpholino for electroporation and can be visualized to assess the presence of the morpholino in the retinal cells. 
	Conditional knockdown in the retina can be used to examine the role of specific proteins at different times during regeneration. Additionally, this approach can be used to study the role of specific proteins in the undamaged retina, in such processes as visual transduction and visual processing in second order neurons.

In vivo Electroporation of Morpholinos into the Adult Zebrafish Retina

A method to conditionally knockdown a target protein&#x2019;s expression in the adult zebrafish retina is described, which involves intravitreally injecting antisense morpholinos and electroporating them into the retina. The resulting protein is knocked down for several days, which allows testing the protein&#x2019;s role in the regenerating or intact retina.

Morpholinos in vivo Elektroporasyon Yetişkin Zebra balığı Retina

Many devastating inherited eye diseases result in progressive and irreversible blindness because humans cannot regenerate dying or diseased retinal ...

In vivo Electroporation of Morpholinos into the Regenerating Adult Zebrafish Tail Fin

Certain species of urodeles and teleost fish can regenerate their tissues. Zebrafish have become a widely used model to study the spontaneous regeneration of adult tissues, such as the heart1, retina2, spinal cord3, optic nerve4, sensory hair cells5, and fins6.
The zebrafish fin is a relatively simple appendage that is easily manipulated to study multiple stages in epimorphic regeneration. Classically, fin regeneration was characterized by three distinct stages: wound healing, blastema formation, and fin outgrowth. After amputating part of the fin, the surrounding epithelium proliferates and migrates over the wound. At 33 &deg;C, this process occurs within six hours post-amputation (hpa, Figure 1B)6,7. Next, underlying cells from different lineages (ex. bone, blood, glia, fibroblast) re-enter the cell cycle to form a proliferative blastema, while the overlying epidermis continues to proliferate (Figure 1D)8. Outgrowth occurs as cells proximal to the blastema re-differentiate into their respective lineages to form new tissue (Figure 1E)8. Depending on the level of the amputation, full regeneration is completed in a week to a month.
The expression of a large number of gene families, including wnt, hox, fgf, msx, retinoic acid, shh, notch, bmp, and activin-betaA genes, is up-regulated during specific stages of fin regeneration9-16. However, the roles of these genes and their encoded proteins during regeneration have been difficult to assess, unless a specific inhibitor for the protein exists13, a temperature-sensitive mutant exists or a transgenic animal (either overexpressing the wild-type protein or a dominant-negative protein) was generated7,12. We developed a reverse genetic technique to quickly and easily test the function of any gene during fin regeneration.
Morpholino oligonucleotides are widely used to study loss of specific proteins during zebrafish, Xenopus, chick, and mouse development17-19. Morpholinos basepair with a complementary RNA sequence to either block pre-mRNA splicing or mRNA translation. We describe a method to efficiently introduce fluorescein-tagged antisense morpholinos into regenerating zebrafish fins to knockdown expression of the target protein. The morpholino is micro-injected into each blastema of the regenerating zebrafish tail fin and electroporated into the surrounding cells. Fluorescein provides the charge to electroporate the morpholino and to visualize the morpholino in the fin tissue.
This protocol permits conditional protein knockdown to examine the role of specific proteins during regenerative fin outgrowth. In the Discussion, we describe how this approach can be adapted to study the role of specific proteins during wound healing or blastema formation, as well as a potential marker of cell migration during blastema formation.

In vivo Electroporation of Morpholinos into the Regenerating Adult Zebrafish Tail Fin

We describe a method to conditionally knockdown the expression of a target protein during adult zebrafish fin regeneration. This technique involves micro-injecting and electroporating antisense oligonucleotide morpholinos into fin tissue, which allows testing the protein&#x2019;s role in various stages of fin regeneration, including wound healing, blastema formation, and regenerative outgrowth.

Yenileyici Yetişkin Zebra balığı Tail Fin içine Morpholinos in vivo olarak Elektroporasyon

Certain species of urodeles and teleost fish can regenerate their tissues. Zebrafish have become a widely used model to study the spontaneous regeneration ...

Gavaging Adult Zebrafish

The zebrafish has become an important in vivo model in biomedical research. Effective methods must be developed and utilized to deliver compounds or agents in solutions for scientific research. Current methods for administering compounds orally to adult zebrafish are inaccurate due to variability in voluntary consumption by the fish. A gavage procedure was developed to deliver precise quantities of infectious agents to zebrafish for study in biomedical research. Adult zebrafish over 6 months of age were anesthetized with 150 mg/L of buffered MS-222 and gavaged with 5 &mu;l of solution using flexible catheter implantation tubing attached to a cut 22-G needle tip. The flexible tubing was lowered into the oral cavity of the zebrafish until the tip of the tubing extended past the gills (approximately 1 cm). The solution was then injected slowly into the intestinal tract. This method was effective 88% of the time, with fish recovering uneventfully. This procedure is also efficient as one person can gavage 20-30 fish in one hour. This method can be used to precisely administer agents for infectious diseases studies, or studies of other compounds in adult zebrafish.

The increasing use of zebrafish as an animal model requires the development of effective methods for the delivery of known quantities of compounds and solutions. The gavage procedure described below allows for the oral delivery of precise volumes of solution reliably, safely and efficiently to adult zebrafish.

Yetişkin Zebra balığı Gavaging

The zebrafish has become an important in vivo model in biomedical research. Effective methods must be developed and utilized to deliver compounds or ...