We thank Monika Kilchenmann, Federica Bisignani and Agathe Duda for their excellent technical assistance.

Bütün deneyler Oftalmik ve Vizyon Araştırma Derneği Vizyon Araştırma ve Oftalmoloji (ARVO) Hayvanların Kullanım Bildirimi yapıştırılır. 1. Hayvanlar <ol><li> 26.5 ° C&#39;lik bir sıcaklıkta ve 14/10 saatlik aydınlık / karanlık döngüsünde 15, su içinde standart koşullar altında, 6-12 ay arasında değişen AB (Oregon) soyunun, vahşi tip zebrafish (Br.rerio) koruyun. </li><li> Kanton Veteriner Dairesi tarafından onaylandıktan sonra hayvan deneyleri için ilgili kurumların hayvan bakım yönergeleri izleyin. </li></ol> 2. MNU Tedavi <ol><li> N-metil-N -nitrosourea (ÇUB) 150 mg / L kuru madde ihtiva eden su hazırlayın. DİKKAT! ÇUB toksiktir; Doğmamış çocuğa kanser, kalıtsal genetik hasara veya zarar görmesine neden olabilir. </li><li> , Oda sıcaklığında 60 dakika boyunca MNU ihtiva eden su içinde zebrafish inkübe edin. </li><li> Hızlı bir şekilde Zebra balığı durulayıntatlı su ve MNU olmadan yeni bir balık tankına balık koymak. Deneyler için arzu edildiği sürece, standart koşullar altında balık koruyun. </li></ol> 3. Görme Keskinliği Ölçümü <ol><li> , Optomotor sistemini başlatmak menüden &#39;test&#39; seçin ve seçenekleri ayarlayın &quot;Basit Staircase&quot;, &quot;Keskinliği (Frekans)&quot; ve &quot;Tesadüf / Ayrı&quot; 16. </li><li> Optomotor sistemi üzerinde 1 m ile yaklaşık 500 ml su ile doldurulmuş bir infüzyon şişesi takın. </li><li> Sınav odasında bir Zebra balığı yerleştirin ve infüzyon şişesi bağlayın. Optomotor sistemde muayene odasına yerleştirin. </li><li> Ölçümü başlatın ve bilgisayar ekranında gerçek zamanlı olarak göz hareketi gözlemlemek. Böylece, olumlu bir yanıt (&quot;evet&quot;) olumsuz yanıt (&quot;hayır&quot;) ise, doğru yönde ardışık sakkadlardan olarak tanımlanır istasyonu ile gözlenen benzeyen rastgele göz hareketleri temsilary ızgaralar. Zebra balığı sergi gözünde ise üç veya daha fazla sonraki optokinetik tepkiler (OKR), basın &#39;evet&#39;; değilse, basın &#39;hayır&#39;. </li><li> Menüsünden &quot;Sonuçlar&quot; başlığı altında, optokinetik uyaranın uzaysal frekansa eşik belirleyerek yazılım tarafından hesaplanmıştır görme keskinliği, ayıklayın. </li></ol> 4. Histoloji <ol><li> Etil 3-aminobenzoat metansülfonat (200-300 mg / L) bir doz aşımı zebrafish Euthanize ve gözleri enükleasyonu. </li><li> Bir kademeli alkol serisi içinde dehidre örnekleri daha sonra 12 saat boyunca 4 ° C&#39;de fosfat tamponlu tuz içerisinde% 4 paraformaldehit (PFA) (PBS) içinde bütün gözleri saptamak ve. </li><li> Parafinde örnekleri embed optik sinir başı (OSB) ile 5 mikron bölümleri kesip bir cam slaytlar monte ederek. </li><li> 4 dakika boyunca hemalum ile deparaffized parafin kesitleri Leke ve% 0.2 hidroklorik ACI, ardından damıtılmış su içinde slaytlar iki kez daldırmad ve% 0.8 amonyak. En az 10 dakika (H &amp; E) musluk suyu hemalum boyamanın geliştirilmesi sonra 3 dakika boyunca eosin ile bölümleri Leke. </li><li> Orta montaj susuz slaytlar embed ve ışık mikroskobu altında slaytlar gözlemlemek. </li></ol> 5. İmmünhistokimya <ol><li> Terminal deoksinükleotidil transferaz dUTP çentik uç etiketleme (TÜNEL) <ol><li> 15 dakika boyunca, oda sıcaklığında 20 ug / ml proteinaz K ile inkübe bölümleri deparafınize edildi. Tris ile bölümlerinin üç kez yıkayın 5 dakika her biri için tuzlu su (TBS) tamponlu. </li><li> 60 dakika boyunca 37 ° C&#39;de nemlendirilmiş bir haznede 50 ul TÜNEL tepkime karışımıyla (% 10 etiketleme çözeltisi ve% 90 enzim solüsyonu) ile inkübe bölümleri. 5 dakika her biri için üç kez TBS ile yıkayın. </li><li> DAPI içeren yerleştirme ortamı ile slaytlar takın ve flöresanlı mikroskop altında slaytlar izleyin. </li></ol></li><li> Prolifere Hücre Nükleer Antijen (PCNA) boyama <ol><li> 3 dakika boyunca antijen geri alma tamponu (Tris-EDTA +% 0.05 Tween 20, pH 9.0) içinde deparafinize edilmiş kesitlerin kaynatılır ve 5 dakika her biri için üç kez TBS ile yıkayın. 100 ul, 1 saat boyunca oda sıcaklığında çözeltisi (TBS +% 10 normal keçi serumu +% 1 sığır serum albümini, pH 7.6) ile bloke ile bloklayın. </li><li> Gece boyunca 4 ° C&#39;de nemlendirilmiş bir haznede 200 seyreltme: 1 anti-PCNA primer antikorlar ile Leke. 5 dakika her biri için TBS + Tween 20 ile üç kez yıkayın. </li><li> 1 saat boyunca oda sıcaklığında 500 seyreltme: 1 uygun sekonder antikor ile algılamayı bitirin. </li><li> DAPI içeren yerleştirme ortamı ile slaytlar takın ve flöresanlı mikroskop altında slaytlar izleyin. </li></ol></li></ol>

<ol>
	<li>Haddad, S., Chen, C. A., Santangelo, S. L., Seddon, J. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+genetics+of+age-related+macular+degeneration:+a+review+of+progress+to+date.">The genetics of age-related macular degeneration: a review of progress to date.</a> Surv. Ophthalmol. 51 (4), 316-363 (2006).</li><li>Bhatti, M. T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Retinitis+pigmentosa,+pigmentary+retinopathies,+and+neurologic+diseases.">Retinitis pigmentosa, pigmentary retinopathies, and neurologic diseases.</a> Curr. Neurol. Neurosci. Rep. 6 (5), 403-413 (2006).</li><li>Hartong, D. T., Berson, E. L., Dryja, T. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Retinitis+pigmentosa.">Retinitis pigmentosa.</a> Lancet. 368, 1795-1809 (2006).</li><li>Tsubura, A., Yoshizawa, K., Kuwata, M., Uehara, N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Animal+models+for+retinitis+pigmentosa+induced+by+MNU;+disease+progression,+mechanisms+and+therapeutic+trials.">Animal models for retinitis pigmentosa induced by MNU; disease progression, mechanisms and therapeutic trials.</a> Histol. Histopathol. 25, 233-248 (2010).</li><li>Machida, K., Urano, K., Yoshimura, M., Tsutsumi, H., Nomura, T., Usui, <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Carcinogenic+comparative+study+on+rasH2+mice+produced+by+two+breeding+facilities.">Carcinogenic comparative study on rasH2 mice produced by two breeding facilities.</a> J. Toxicol. Sci. 33, 493-501 (2008).</li><li>Morton, D., 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=N-Methyl-N-Nitrosourea+(MNU):+A+positive+control+chemical+for+p53+/-+mouse+carcinogenicity+studies.">N-Methyl-N-Nitrosourea (MNU): A positive control chemical for p53+/- mouse carcinogenicity studies.</a> Toxicol. Pathol. 36, 926-931 (2008).</li><li>Terracini, B., Testa, M. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Carcinogenicity+of+a+single+administration+of+N-nitrosomethylurea:+a+comparison+between+newborn+and+5-week-old+mice+and+rats.">Carcinogenicity of a single administration of N-nitrosomethylurea: a comparison between newborn and 5-week-old mice and rats.</a> 24, 588-598 (1970).</li><li>Zulliger, R., Lecaud&#233;, S., Eigeldinger-Berthou, S., Wolf-Schnurrbusch, U. E. K., Enzmann, V. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Caspase-3-independent+photoreceptor+degeneration+by+N-methyl-N-nitrosourea+(MNU)+induces+morphological+and+functional+changes+in+the+mouse+retina.">Caspase-3-independent photoreceptor degeneration by N-methyl-N-nitrosourea (MNU) induces morphological and functional changes in the mouse retina.</a> Graefes Arch. Clin. Exp. Ophthalmol. 249, 859-869 (2011).</li><li>Tappeiner, C., 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=Characteristics+of+rod+regeneration+in+a+novel+zebrafish+retinal+degeneration+model+using+N-methyl-N-nitrosourea+(MNU).">Characteristics of rod regeneration in a novel zebrafish retinal degeneration model using N-methyl-N-nitrosourea (MNU).</a> PLOS One. 12, (2013).</li><li>Bilotta, J., Saszik, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+zebrafish+as+a+model+visual+system.">The zebrafish as a model visual system.</a> Int. J. Dev. Neurosci. 19, 621-629 (2001).</li><li>Fleisch, C., Neuhauss, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Visual+Behavior+in+Zebrafish.">Visual Behavior in Zebrafish.</a> Zebrafish. 3, 191-201 (2006).</li><li>Hodel, C., Neuhauss, S. C. F., Biehmaier, O. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Time+course+and+development+of+light+adaptation+processes+in+the+outer+zebrafish+retina.">Time course and development of light adaptation processes in the outer zebrafish retina.</a> InterScience. 288, 653-662 (2006).</li><li>Gemberling, M., Bailey, T. J., Hyde, D. R., Poss, K. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+zebrafish+as+a+model+for+complex+tissue+regeneration.">The zebrafish as a model for complex tissue regeneration.</a> Trends Genet. 29 (11), 611-620 (2013).</li><li>Brockerhoff, S. E., Fadool, J. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Genetics+of+photoreceptor+degeneration+and+regeneration+in+zebrafish.">Genetics of photoreceptor degeneration and regeneration in zebrafish.</a> Cell Mol. Life Sci. 68, 651-659 (2011).</li><li>Brand, M., Granato, M., N&#252;sslein-Volhard, C., N&#252;sslein-Volhard, C., Dahm, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Keeping+and+raising+zebrafish.">Keeping and raising zebrafish.</a> Zebrafish: A Practical Approach. , 7-38 (2002).</li><li>Tappeiner, C., Gerber, S., Enzmann, V., Balmer, J., Jazwinska, A., Tschopp, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Visual+acuity+and+contrast+sensitivity+of+adult+zebrafish.">Visual acuity and contrast sensitivity of adult zebrafish.</a> Front. Zool. 9 (1), 10 (2012).</li><li>Bailey, T. J., Fossum, S. L., Fimbel, S. M., Montgomery, J. E., Hyde, D. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+inhibitor+of+phagocytosis,+O-phospho-L-serine,+suppresses+M&#252;ller+glia+proliferation+and+cone+cell+regeneration+in+the+light-damaged+zebrafish+retina.">The inhibitor of phagocytosis, O-phospho-L-serine, suppresses M&#252;ller glia proliferation and cone cell regeneration in the light-damaged zebrafish retina.</a> Exp. Eye Res. 91, 601-612 (2010).</li><li>Nelson, C. M., Hyde, D. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=M&#252;ller+glia+as+a+source+of+neuronal+progenitor+cells+to+regenerate+the+damaged+zebrafish+retina.">M&#252;ller glia as a source of neuronal progenitor cells to regenerate the damaged zebrafish retina.</a> Adv. Exp. Med. Biol. 723, 425-430 (2012).</li><li>Prusky, G. T., Alam, N. M., Beekman, S., Douglas, R. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Rapid+quantification+of+adult+and+developing+mouse+spatial+vision+using+a+virtual+optomotor+system.">Rapid quantification of adult and developing mouse spatial vision using a virtual optomotor system.</a> Invest. Ophthalmol Vis. Sci. 45 (12), 4611-4616 (2004).</li><li>Beck, J. C., Gilland, E., Tank, D. W., Baker, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Quantifying+the+ontogeny+of+optokinetic+and+vestibulo-ocular+behaviors+in+zebrafish,+medaka,+and+goldfish.">Quantifying the ontogeny of optokinetic and vestibulo-ocular behaviors in zebrafish, medaka, and goldfish.</a> J. Neurophysiol. 92 (6), 3546-3561 (2004).</li><li>Fimbel, S. M., Montgomery, J. E., Burket, C. T., Hyde, D. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Regeneration+of+Inner+Retinal+Neurons+after+Intravitreal+Injection+of+Ouabain+in.">Regeneration of Inner Retinal Neurons after Intravitreal Injection of Ouabain in.</a> Zebrafish. J. Neurosci. 27, 1712-1724 (2007).</li><li>Sherpa, T., 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=Ganglion+cell+regeneration+following+whole-retina+destruction+in+zebrafish.">Ganglion cell regeneration following whole-retina destruction in zebrafish.</a> Dev. Neurobiol. 68, 166-181 (2008).</li><li>Yurco, P., Cameron, D. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Responses+of+M&#252;ller+glia+to+retinal+injury+in+adult+zebrafish.">Responses of M&#252;ller glia to retinal injury in adult zebrafish.</a> Vision Res. 45, 991-1002 (2005).</li></ol>

The authors have nothing to disclose.

Daha önce, bizim grup Zebrafish sistemine 9 içine kemirgenler fotoreseptör dejenerasyonu MNU modelini transfer etti. Takip eden olaylar anlatılmış ve 30 güne kadar takip edildi. Bu süre içinde tam retina morfolojik dejenerasyon ve rejenerasyon ilk tedaviden sonra meydana geldi. İlk olarak, histoloji azalmış bir çubuk hücre Buna 8. günde en az on gün 3 saymak ortaya, TUNEL boyama 3 gün MNU tedaviden sonra çubuk fotoreseptör apoptozisini tanımlar. Rejenerasyon Prolifere eden hücreler, bu ç...

Vizyon insan için en önemli duyu ve değer düşüklüğü, yüksek sosyo-ekonomik etkisi vardır. Gelişmiş dünyada, retina dejeneratif hastalıklar yaşlı yetişkinler 1 arasında görme kaybı ve körlük önde gelen nedenidir. En dejeneratif retina hastalıklarının nedeni kısmen anlaşılır ve tedavi çözümleri kayıp vizyon kazanmak için çok sınırlı. Retinitis pigmentosa N -nitrosourea (ÇUB), retinal dejenerasyon meydana metiltio, primer fotoreseptör kaybı 2-3. N retinal dejeneratif bir hastalığın tipik bir örneğidir ve bu nedenle yaygın primer fotoreseptör hücre ölümü ile 4 hastalıkların modellemek için kemirgenlerde kullanılır. Bu bir alkilleyici madde ve genellikle 5-7 maruz bir kaç ay sonra görünür huylu ve kötü huylu tümörler, yol açar. Buna ek olarak, kısa süreli bir gözlem süresi içinde özel bir fotoreseptör hücre ölümüne neden olur. Böylece, retina tabaka Yapıdaki kaybıre ve anlamlı bir retina incelmesi konsantrasyona bağlı bir şekilde tespit edilmiştir. Retina glia hücreleri aktive edildi, ancak retina pigment epiteli (RPE) hiçbir değişiklik bulundu. Endoplazmik retikulum (ER), stres ile ilgili apoptoz retinada 8 ÇUB etkisinin en temel bir yol olarak görünmektedir. Biz son zamanlarda Zebrafish 9 fotoreseptör dejenerasyonu ikna etmek için bir kimyasal model olarak MNU girmiştik. Diğer nedenler arasında, Zebra balığı (Br.rerio) çünkü diğer omurgalıların 10 o kendi görsel sistemin benzerlikler görsel araştırma önemli hale gelmiştir. Dış retina ultraviyole, kısa, orta tepe hassasiyetleri ve görünür spektrumu uzun dalga boyu ve bir çubuk fotoreseptör türüyle dört farklı koni gruba ayrılabilir olabilir fotoreseptörleri içerir. Iç nükleer tabaka (INL) olarak, bipolar, yatay ve amacrine internöron hücre gövdeleri, wel olarak bulunurlarMuller, glia hücreleri, hücre soma olarak L.. Dış pleksiform katman (OPL) içinde fotoreseptör ve iç retina arasındaki sinaptik iletişim lensin en yakın hücre tabakası ise optik sinir ve optik sistemini içeren uzun aksonlar oluşturan bileşenler ve ganglion hücre tabakası (GC) olan oluşturulmaktadır . Salgı bezleri ve iç nükleer tabakadaki hücrelerin arasında olduğu, sinaptik temasların olarak iç pleksiform tabakasındaki (IPL) 11 oluşur. RPE nörosensöriyel retina dışında yer alır ve uzun apikal mikrovilluslu 12 ile fotoreseptör dış segmentleri çevreler. Ayrıca, Zebrafish yüksek rejeneratif ve lezyonlu beyin, retina, omurilik, kalp ve diğer dokuları 13 yetiştirmeleri için yapabiliyor. Retinal hasar oluştuğunda, Muller hücreleri olduğu düşünülmektedir INL hücreleri, aktive edilmiş ve çeşitli retinal hücre tipleri içine ayırt etmek için bir potansiyele sahiptir. Buna ek olarak, aynı zamanda ONL bulunan çubuk progenitörlerle üretir. Başka bir nedenleYeni hücreler ile yetişkin zebrafish retina malzemeleri urce siliyer marjinal bölgesidir. Bu kaynak, sürekli olarak büyüyen Zebrafish göz 14 çubuk fotoreseptör sabit bir yoğunluğu elde etmek için gereklidir. ÇUB modeli retina dokusu için basit ve tekrarlanabilir bir dejenerasyon / yenilenmesi yaklaşımı olarak da kullanılabilir. Nedeniyle Zebra balığı biyolojik süreçler bazı benzerlikleri ve insanlarda bu ilgili hücre ölümü yolları belirlemek için kapıları açmak ve potansiyel nöroprotektif ilaç ekrana. Bizim gruptan bir önceki çalışmaya göre, biz şimdi retina de- ve laboratuvar videoları 9 uygun fonksiyonel değişiklikler dahil olmak üzere izleyen rejenerasyon bu MNU kaynaklı zebrabalıkları modelinin yöntemlerini göstermektedir.

<table border="0" cellpadding="0" cellspacing="0" >
	<tbody>
		<tr >
			<td >Acetic acid</td>
			<td>Sigma-Aldrich, Buchs, Switzerland</td>
			<td>A6283</td>
			<td></td>
		</tr>
		<tr >
			<td >Ammonia</td>
			<td>Sigma-Aldrich, Buchs, Switzerland</td>
			<td>294993</td>
			<td>0.80%</td>
		</tr>
		<tr >
			<td >Bovine serum albumine (BSA)</td>
			<td>Sigma-Aldrich, Buchs, Switzerland</td>
			<td>05470</td>
			<td></td>
		</tr>
		<tr >
			<td >Dako Pen</td>
			<td>Dako, Glostrup, Danmark</td>
			<td>S2002</td>
			<td></td>
		</tr>
		<tr >
			<td >DAPI mounting medium</td>
			<td>Vector Labs, Burlingame, CA, USA</td>
			<td>H-1200</td>
			<td></td>
		</tr>
		<tr >
			<td >Eosin</td>
			<td>Sigma-Aldrich, Buchs, Switzerland</td>
			<td>45260</td>
			<td></td>
		</tr>
		<tr >
			<td >Ethanol</td>
			<td>Sigma-Aldrich, Buchs, Switzerland</td>
			<td>2860</td>
			<td>100%, 96%, 70%</td>
		</tr>
		<tr >
			<td >Ethylenediaminetetraacetic acid (EDTA)</td>
			<td>Sigma-Aldrich, Buchs, Switzerland</td>
			<td>ED</td>
			<td></td>
		</tr>
		<tr >
			<td >Ethyl 3-aminobenzoate methanesulfonate salt</td>
			<td>Sigma-Aldrich, Buchs, Switzerland</td>
			<td>E10521</td>
			<td>Tricaine</td>
		</tr>
		<tr >
			<td >Eukitt</td>
			<td>Sigma-Aldrich, Buchs, Switzerland</td>
			<td>3989</td>
			<td></td>
		</tr>
		<tr >
			<td >Goat anti-rabbit Alexa 594</td>
			<td>Life Technologies, Zug, Switzerland</td>
			<td>A11012</td>
			<td></td>
		</tr>
		<tr >
			<td >Goat normal serum</td>
			<td>Dako, Glostrup, Danmark</td>
			<td>X0907</td>
			<td></td>
		</tr>
		<tr >
			<td >Hydrochloric acid</td>
			<td>Sigma-Aldrich, Buchs, Switzerland</td>
			<td>320331</td>
			<td>0.20%</td>
		</tr>
		<tr >
			<td >In situ Cell Death Detection Kit</td>
			<td>Roche Applied Sciences, Rotkreuz, Switzerland</td>
			<td>11684795910</td>
			<td>TUNEL Kit</td>
		</tr>
		<tr >
			<td >Mayer&#39;s hemalum solution</td>
			<td>Merck, Darmstadt, Germany</td>
			<td>109249</td>
			<td></td>
		</tr>
		<tr >
			<td >Methylnitrosourea (MNU)</td>
			<td>Sigma-Aldrich, Buchs, Switzerland</td>
			<td>N4766</td>
			<td>Toxic</td>
		</tr>
		<tr >
			<td >OptoMotry</td>
			<td>CerebralMechanics, Lethbridge, AB, Canada</td>
			<td>n.a.</td>
			<td></td>
		</tr>
		<tr >
			<td >Paraformaldehyde (PFA)</td>
			<td>Sigma-Aldrich, Buchs, Switzerland</td>
			<td>P6148</td>
			<td></td>
		</tr>
		<tr >
			<td >Phosphate buffered saline (PBS)</td>
			<td>Sigma-Aldrich, Buchs, Switzerland</td>
			<td>P5368</td>
			<td></td>
		</tr>
		<tr >
			<td >Proteinase K</td>
			<td>Dako, Glostrup, Danmark</td>
			<td>S3004</td>
			<td></td>
		</tr>
		<tr >
			<td >Rabbit anti-PCNA</td>
			<td>Santa Cruz Biotechnology, Santa Cruz, USA</td>
			<td>sc-33756</td>
			<td></td>
		</tr>
		<tr >
			<td >Superfrost Plus glass slides</td>
			<td>Gehard Menzel GmbH, Braunschweig, Germany</td>
			<td>10149870</td>
			<td></td>
		</tr>
		<tr >
			<td >Tris buffered saline (TBS)</td>
			<td>Sigma-Aldrich, Buchs, Switzerland</td>
			<td>P5912</td>
			<td></td>
		</tr>
		<tr >
			<td >Trizma&#210; base</td>
			<td>Sigma-Aldrich, Buchs, Switzerland</td>
			<td>T1503</td>
			<td></td>
		</tr>
		<tr >
			<td >Tween 20</td>
			<td>Sigma-Aldrich, Buchs, Switzerland</td>
			<td>P1379</td>
			<td></td>
		</tr>
		<tr >
			<td >Xylene</td>
			<td>Sigma-Aldrich, Buchs, Switzerland</td>
			<td>534056</td>
			<td></td>
		</tr>
		<tr >
			<td >Zebrafish (Danio rerio) AB (Oregon) strain</td>
			<td>University of Fribourg, Dept. of Biology</td>
			<td>n.a.</td>
			<td>Own fish facility</td>
		</tr>
	</tbody>
</table>

methylnitrosourea (mnu)-induced retinal degeneration and regeneration in the zebrafish: histological and functional characteristics

Endüstriyel dünyada görme kaybının çoğunluğu için fotoreseptör hasar hesabı ile sonuçlanan retina dejeneratif hastalıklar, örneğin retinitis pigmentosa,. Hayvan modelleri, bu tür hastalıkları incelemek için temel bir öneme sahiptir. Bu bağlamda, N-metil-N -nitrosourea (ÇUB) yaygın olarak kemirgenlerde kullanılmıştır fotoreseptör spesifik toksin farmasötik olarak retina dejenerasyonuna tetiklemek için karıştırılabilir. Daha önce, Zebra balığı bir MNU kaynaklı retina dejenerasyonu modeli, görsel araştırmalar başka popüler model sistem kurduk. Memelilere büyüleyici bir fark yetişkin zebrabalıkları retina ve hasar sonra rejenerasyon kalıcı nöron olduğunu. Biz yetişkin zebrabalıkları görme keskinliği ölçümleri istihdam var bu gözlemi ölçmek için. Böylece, optokinetik refleks olmayan anestezi balık fonksiyonel değişiklikleri izlemek için kullanılmıştır. Bu immünhistokimyasal staini yanı sıra histoloji ile takviye edildiapoptosis için ng (TÜNEL) ve çoğalması (PCNA) gelişmekte morfolojik değişiklikler ilişkilendirmek için. Özet olarak, fotoreseptör apoptoz üç gün dış çekirdek katmanında (ONL) hücrelerin belirgin bir azalma izler ÇUB tedaviden sonra ortaya çıkar. Bundan sonra, iç nükleer tabaka (INL) ve onl hücre çoğalması gözlenmiştir. Burada, bir tam histolojik kalmaz, aynı zamanda etkin bir yenilenmesi, 30 günlük bir süre boyunca oluşturduğunu ortaya koymuştur. Şimdi ölçmek ve video formatında MNU kullanarak Zebra balığı retina DE- ve yenilenmesini takip yöntemleri açıklamaktadır.

Görme keskinliği: Deneysel set-up [mekansal frekans: 0.042 daireler / derecesi (c / d); kontrast: 100%; sürüklenme hızı: 20 derece / saniye (d / src); arka ışık parlaklık: 152 cd / m 2] Bu çalışmada, yetişkin zebrabalıkları OKR değerlendirmesini sağladı. Iyi prosedürü tolere her zebrabalıkları, 10 dakika - VA ölçüm süresi ortalama yaklaşık 5 oldu. MNU maruz önce görme keskinliği 0.577 ± 0.014 devir / derece (c / d) idi. 1 150 mg / ...

Watch this Scientific Journal Video about Methylnitrosourea MNU-induced Retinal Degeneration and Regeneration in the Zebrafish: Histological and Functional Characteristics at JoVE.com

Methylnitrosourea MNU-induced Retinal Degeneration and Regeneration in the Zebrafish: Histological and Functional Characteristics

Bu yazıda retina de- ve rejenerasyon ve yetişkin zebrabalıkları N-metil-N -nitrosourea kullanarak görme fonksiyonu üzerindeki etkisinin ölçümü göstermektedir. Görme keskinliği kaybı ve azalmış fotoreseptör numaraları iç nükleer tabakada çoğalması ile takip edildi. Komple morfolojik ve fonksiyonel rejenerasyon 30 gün ilk tedaviden sonra meydana geldi.

Histolojik ve Fonksiyonel Özellikleri: Methylnitrosourea (MNU) Retina Dejenerasyonu ve Rejenerasyon Zebra balığı -kaynaklı

Retinal degenerative diseases, e.g. retinitis pigmentosa, with resulting photoreceptor damage account for the majority of vision loss in the industrial ...

methylnitrosourea-mnu-induced-retinal-degeneration-regeneration

Research

JoVE Journal

Biology

Methylnitrosourea (MNU)-induced Retinal Degeneration and Regeneration in the Zebrafish: Histological and Functional Characteristics

11.4K Görüntüleme.  University of Bern.  Bu yazıda retina de- ve rejenerasyon ve yetişkin zebrabalıkları N-metil-N -nitrosourea kullanarak görme fonksiyonu üzerindeki etkisinin ölçümü göstermektedir. Görme keskinliği kaybı ve azalmış fotoreseptör numaraları iç nükleer tabakada çoğalması ile takip edildi. Komple morfolojik ve fonksiyonel rejenerasyon 30 gün ilk tedaviden sonra meydana geldi. 

Video: Methylnitrosourea MNU-induced Retinal Degeneration and Regeneration in the Zebrafish: Histological and Functional Characteristics

Laser Ablation of the Zebrafish Pronephros to Study Renal Epithelial Regeneration

Acute kidney injury (AKI) is characterized by high mortality rates from deterioration of renal function over a period of hours or days that culminates in renal failure1. AKI can be caused by a number of factors including ischemia, drug-based toxicity, or obstructive injury1. This results in an inability to maintain fluid and electrolyte homeostasis. While AKI has been observed for decades, effective clinical therapies have yet to be developed. Intriguingly, some patients with AKI recover renal functions over time, a mysterious phenomenon that has been only rudimentally characterized1,2. Research using mammalian models of AKI has shown that ischemic or nephrotoxin-injured kidneys experience epithelial cell death in nephron tubules1,2, the functional units of the kidney that are made up of a series of specialized regions (segments) of epithelial cell types3. Within nephrons, epithelial cell death is highest in proximal tubule cells. There is evidence that suggests cell destruction is followed by dedifferentiation, proliferation, and migration of surrounding epithelial cells, which can regenerate the nephron entirely1,2. However, there are many unanswered questions about the mechanisms of renal epithelial regeneration, ranging from the signals that modulate these events to reasons for the wide variation of abilities among humans to regenerate injured kidneys.
The larval zebrafish provides an excellent model to study kidney epithelial regeneration as its pronephric kidney is comprised of nephrons that are conserved with higher vertebrates including mammals4,5. The nephrons of zebrafish larvae can be visualized with fluorescence techniques because of the relative transparency of the young zebrafish6. This provides a unique opportunity to image cell and molecular changes in real-time, in contrast to mammalian models where nephrons are inaccessible because the kidneys are structurally complex systems internalized within the animal. Recent studies have employed the aminoglycoside gentamicin as a toxic causative agent for study of AKI and subsequent renal failure: gentamicin and other antibiotics have been shown to cause AKI in humans, and researchers have formulated methods to use this agent to trigger kidney damage in zebrafish7,8. However, the effects of aminoglycoside toxicity in zebrafish larvae are catastrophic and lethal, which presents a difficulty when studying epithelial regeneration and function over time. Our method presents the use of targeted cell ablation as a novel tool for the study of epithelial injury in zebrafish. Laser ablation gives researchers the ability to induce cell death in a limited population of cells. Varying areas of cells can be targeted based on morphological location, function, or even expression of a particular cellular phenotype. Thus, laser ablation will increase the specificity of what researchers can study, and can be a powerful new approach to shed light on the mechanisms of renal epithelial regeneration. This protocol can be broadly applied to target cell populations in other organs in the zebrafish embryo to study injury and regeneration in any number of contexts of interest.

Acute kidney injury (AKI) in humans is a common clinical problem caused by damage to the epithelial cells that comprise kidney nephrons, and AKI is associated with high mortality rates of 50-70%1. Following epithelial cell destruction, nephrons have a limited ability to regenerate, though the mechanisms and limitations that guide this phenomenon remain poorly understood. In this video article, we describe our technique for targeted laser ablation of kidney nephron cells in the zebrafish embryo kidney, or pronephros. Our new method can be used to complement nephrotoxicity-induced models of AKI and gain a high-resolution understanding of the cell and molecular alterations that are associated with epithelial regeneration in the kidney nephron.

Zebra balığı Pronephros Lazer Ablasyon Böbrek Epitel Rejenerasyon Eğitim

Acute kidney injury (AKI) is characterized by high mortality rates from deterioration of renal function over a period of hours or days that culminates in ...

Biyoloji

Pharmacological and Functional Genetic Assays to Manipulate Regeneration of the Planarian Dugesia japonica

Free-living planarian flatworms have a long history of experimental usage owing to their remarkable regenerative abilities1. Small fragments excised from these animals reform the original body plan following regeneration of missing body structures. For example if a 'trunk' fragment is cut from an intact worm, a new 'head' will regenerate anteriorly and a 'tail' will regenerate posteriorly restoring the original 'head-to-tail' polarity of body structures prior to amputation (Figure 1A).
Regeneration is driven by planarian stem cells, known as 'neoblasts' which differentiate into ~30 different cell types during normal body homeostasis and enforced tissue regeneration. This regenerative process is robust and easy to demonstrate. Owing to the dedication of several pioneering labs, many tools and functional genetic methods have now been optimized for this model system. Consequently, considerable recent progress has been made in understanding and manipulating the molecular events underpinning planarian developmental plasticity2-9.
The planarian model system will be of interest to a broad range of scientists. For neuroscientists, the model affords the opportunity to study the regeneration of an entire nervous system, rather than simply the regrowth/repair of single nerve cell process that typically are the focus of study in many established models. Planarians express a plethora of neurotransmitters10, represent an important system for studying evolution of the central nervous system11, 12 and have behavioral screening potential13, 14. 
Regenerative outcomes are amenable to manipulation by pharmacological and genetic apparoaches. For example, drugs can be screened for effects on regeneration simply by placing body fragments in drug-containing solutions at different time points after amputation. The role of individual genes can be studied using knockdown methods (in vivo RNAi), which can be achieved either through cycles of microinjection or by feeding bacterially-expressed dsRNA constructs8, 9, 15. Both approaches can produce visually striking phenotypes at high penetrance- for example, regeneration of bipolar animals16-21. To facilitate adoption of this model and implementation of such methods, we showcase in this video article protocols for pharmacological and genetic assays (in vivo RNAi by feeding) using the planarian Dugesia japonica.

Pharmacological and Functional Genetic Assays to Manipulate Regeneration of the Planarian Dugesia japonica

An attractive model for studying stem cell differentiation within a live animal is the planarian flatworm. Regeneration is studied by simple amputation experiments that are easily performed in a basic laboratory and are amenable to pharmacological and genetic (in vivo RNAi) manipulation as detailed by protocols in this article.

Farmakolojik ve Fonksiyonel Genetik Tahliller Planarian Rejenerasyon işleyin<emJaponica> Dugesia</em

Free-living planarian flatworms have a long history of experimental usage owing to their remarkable regenerative abilities1. Small fragments excised from ...

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 ...

An Assay for Lateral Line Regeneration in Adult Zebrafish

Due to the clinical importance of hearing and balance disorders in man, model organisms such as the zebrafish have been used to study lateral line development and regeneration. The zebrafish is particularly attractive for such studies because of its rapid development time and its high regenerative capacity. To date, zebrafish studies of lateral line regeneration have mainly utilized fish of the embryonic and larval stages because of the lower number of neuromasts at these stages. This has made quantitative analysis of lateral line regeneration/and or development easier in the earlier developmental stages. Because many zebrafish models of neurological and non-neurological diseases are studied in the adult fish and not in the embryo/larvae, we focused on developing a quantitative lateral line regenerative assay in adult zebrafish so that an assay was available that could be applied to current adult zebrafish disease models. Building on previous studies by Van Trump et al.17&#160;that described procedures for ablation of hair cells in adult Mexican blind cave fish and zebrafish (Danio rerio), our assay was designed to allow quantitative comparison between control and experimental groups. This was accomplished by developing a regenerative neuromast standard curve based on the percent of neuromast reappearance over a 24 hr time period following gentamicin-induced necrosis of hair cells in a defined region of the lateral line. The assay was also designed to allow extension of the analysis to the individual hair cell level when a higher level of resolution is required.

Because many zebrafish models of neurological and non-neurological diseases are studied in the adult fish rather than the embryo/larvae, we developed a quantitative lateral line regenerative assay that can be applied to adult zebrafish disease models. The assay involved resolution at the 1) neuromast and 2) individual hair cell levels.

Yetişkin Zebra balığı Lateral Hat Rejenerasyon için bir Deneyi

Due to the clinical importance of hearing and balance disorders in man, model organisms such as the zebrafish have been used to study lateral line ...

Gap Junctional Intercellular Communication: A Functional Biomarker to Assess Adverse Effects of Toxicants and Toxins, and Health Benefits of Natural Products

This protocol describes a scalpel loading-fluorescent dye transfer (SL-DT) technique that measures intercellular communication through gap junction channels, which is a major intercellular process by which tissue homeostasis is maintained. Interruption of gap junctional intercellular communication (GJIC) by toxicants, toxins, drugs, etc. has been linked to numerous adverse health effects. Many genetic-based human diseases have been linked to mutations in gap junction genes. The SL-DT technique is a simple functional assay for the simultaneous assessment of GJIC in a large population of cells. The assay involves pre-loading cells with a fluorescent dye by briefly perturbing the cell membrane with a scalpel blade through a population of cells. The fluorescent dye is then allowed to traverse through gap junction channels to neighboring cells for a designated time. The assay is then terminated by the addition of formalin to the cells. The spread of the fluorescent dye through a population of cells is assessed with an epifluorescence microscope and the images are analyzed with any number of morphometric software packages that are available, including free software packages found on the public domain. This assay has also been adapted for in vivo studies using tissue slices from various organs from treated animals. Overall, the SL-DT assay can serve a broad range of in vitro pharmacological and toxicological needs, and can be potentially adapted for high throughput set-up systems with automated fluorescence microscopy imaging and analysis to elucidate more samples in a shorter time.

This protocol describes a scalpel loading-fluorescent dye transfer technique that measures intercellular communication through gap junction channels. Gap junctional intercellular communication is a major cellular process by which tissue homeostasis is maintained and disruption of this cell signaling has adverse health effects.

Gap Junctional Hücreler arası iletişim: Doğal Ürünler Toksikantların ve Toksinler Yan Etkileri değerlendirmek için Fonksiyonel Biyomarker ve Sağlık Faydaları

This protocol describes a scalpel loading-fluorescent dye transfer (SL-DT) technique that measures intercellular communication through gap junction ...

Immunolabelling Myofiber Degeneration in Muscle Biopsies

The necrosis of muscle fibres (myonecrosis) plays a central role in the pathogenesis of several muscle conditions, including muscular dystrophies. Therapeutic options addressing the causes of muscular dystrophy pathogenesis are expected to alleviate muscle degeneration. Therefore, a method to assay and quantify the extent of cell death in muscle biopsies is needed. Conventional methods to observe myofiber degeneration in situ are either poorly quantitative or rely on the injection of vital dyes. In this article, an immunofluorescence protocol is described that stains necrotic myofibers by targeting immunoglobulin G (IgG) uptake by myofibers. The IgG uptake method is based on cell features characterizing the necrotic demise, including 1) the loss of plasma membrane integrity with the release of damage-associated molecular patterns and 2) the uptake of plasmatic proteins. In murine cross-sections, the co-immunolabelling of myofibers, extracellular matrix proteins, and mouse IgG allows clean and straightforward identification of myofibers with necrotic fate. This simple method is suitable for quantitative analysis and applicable to all species, including human samples, and does not require the injection of vital dye. The staining of necrotic myofibers by IgG uptake can also be paired with other co-immunolabelling.

Described here is a protocol for direct immunolabelling of necrotic myofibers in muscle cryosections. Necrotic cells are permeable to serum proteins, including immunoglobulin G (IgG). Revealing the uptake of IgG by myofibers allows the identification and quantification of myofibers that undergo necrosis regardless of muscle condition.

Kas Biyopsilerinde İmmünlabelling Miyofiber Dejenerasyon

The necrosis of muscle fibres (myonecrosis) plays a central role in the pathogenesis of several muscle conditions, including muscular dystrophies. ...

Nitroreductase/Metronidazole-Mediated Ablation and a MATLAB Platform (RpEGEN) for Studying Regeneration of the Zebrafish Retinal Pigment Epithelium

The retinal pigment epithelium (RPE) resides at the back of the eye and performs functions essential for maintaining the health and integrity of adjacent retinal and vascular tissues. At present, the limited reparative capacity of mammalian RPE, which is restricted to small injuries, has hindered progress to understanding in vivo RPE regenerative processes. Here, a detailed methodology is provided to facilitate the study of in vivo RPE repair utilizing the zebrafish, a&#160;vertebrate model capable of robust tissue regeneration. This protocol describes a transgenic nitroreductase/metronidazole (NTR/MTZ)-mediated injury paradigm (rpe65a:nfsB-eGFP), which results in ablation of the central two-thirds of the RPE after 24 h treatment with MTZ, with subsequent tissue recovery. Focus is placed on RPE ablations in larval zebrafish and methods for testing the effects of pharmacological compounds on RPE regeneration are also outlined. Generation and validation of RpEGEN, a MATLAB script created to automate quantification of RPE regeneration based on pigmentation, is also discussed. Beyond active RPE repair mechanisms, this protocol can be expanded to studies of RPE degeneration and injury responses as well as the effects of RPE damage on adjacent retinal and vascular tissues, among other cellular and molecular processes. This zebrafish system holds significant promise in identifying genes, networks, and processes that drive RPE regeneration and RPE disease-related mechanisms, with the long-term goal of applying this knowledge to mammalian systems and, ultimately, toward therapeutic development.

Nitroreductase/Metronidazole-Mediated Ablation and a MATLAB Platform RpEGEN for Studying Regeneration of the Zebrafish Retinal Pigment Epithelium

This protocol describes the methodology to genetically ablate the retinal pigment epithelium (RPE) using a transgenic zebrafish model. Adapting the protocol to incorporate signaling pathway modulation using pharmacological compounds is extensively detailed. A MATLAB platform for quantifying RPE regeneration based on pigmentation was developed and is presented and discussed.

Zebra Balığı Retinal Pigment Epitelinin Rejenerasyonunu İncelemek için Nitroredüktaz / Metronidazol Aracılı Ablasyon ve Bir MATLAB Platformu (RpEGEN)

The retinal pigment epithelium (RPE) resides at the back of the eye and performs functions essential for maintaining the health and integrity of adjacent ...

Efficient and Consistent Generation of Retinal Pigment Epithelium/Choroid Flatmounts from Human Eyes for Histological Analysis

The retinal pigment epithelium (RPE) and retina are functionally and structurally connected tissues that work together to regulate light perception and vision. Proteins on the RPE apical surface are tightly associated with proteins on the photoreceptor outer segment surface, making it difficult to consistently separate the RPE from the photoreceptors/retina. We developed a method to efficiently separate the retina from the RPE of human eyes to generate complete RPE/choroid and retina flatmounts for separate cellular analysis of the photoreceptors and RPE cells. An intravitreal injection of a high-osmolarity solution of D-mannitol, a sugar not transported by the RPE, induced the separation of the RPE and retina across the entire posterior chamber without causing damage to the RPE cell junctions. No RPE patches were observed attached to the retina. Phalloidin labeling of actin showed RPE shape preservation and allowed morphometric analysis of the entire epithelium. An artificial intelligence (AI)-based software was developed to accurately recognize and segment the RPE cell borders and quantify 30 different shape metrics. This dissection method is highly reproducible and can be easily extended to other animal models.

We describe a method to efficiently separate retinal pigment epithelium (RPE) from the retina in human eyes and generate whole RPE/choroid flatmounts for histological and morphometric analyses of the RPE.

Histolojik Analiz için İnsan Gözünden Retinal Pigment Epitel/Koroid Flatmount'larının Verimli ve Tutarlı Üretimi

The retinal pigment epithelium (RPE) and retina are functionally and structurally connected tissues that work together to regulate light perception and ...