Name: high-fat feeding paradigm for larval zebrafish: feeding, live imaging, and quantification of food intake
Uploaded: 2016-10-27T15:00:00
Description: Watch this Scientific Journal Video about High-fat Feeding Paradigm for Larval Zebrafish: Feeding, Live Imaging, and Quantification of Food Intake at JoVE.com

The authors thank Meng-Chieh Shen for images, Jennifer Anderson for providing helpful comments on the manuscript, and members of the Farber laboratory for their contributions in developing these techniques. This study was funded by NIDDK-NIH award RO1DK093399 (S.A.F.), RO1GM63904 (The Zebrafish Functional Genomics Consortium: PI Stephen Ekker and Co-PI S.A.F), and F32DK096786 (J.P.O.). This content is solely the responsibility of the authors and does not necessarily represent the official views of NIH. Additional support was provided by the G. Harold and Leila Y. Mathers Charitable Foundation to the laboratory of S.A.F and the Carnegie Institution for Science endowment.

Estos protocolos han sido aprobados por la Institución Carnegie para la Ciencia Institucional Cuidado de Animales y el empleo (Protocolo nº. 139). 1. Preparación de los animales <ol><li> Mantener los adultos y las larvas a 28 ° C en un 14 h: 10 h luz: oscuridad ciclo. Alimentar a los adultos dos veces al día con la cáscara de Artemia libre (decapsulated, no eclosión, a partir de las 14 dpf) y microgránulos comerciales. </li><li> Estos protocolos se han optimizado para el uso de 6-7 larvas dpf ...

<ol>
	<li>Carten, J. D., Farber, S. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+new+model+system+swims+into+focus:+using+the+zebrafish+to+visualize+intestinal+metabolism+in+vivo.">A new model system swims into focus: using the zebrafish to visualize intestinal metabolism in vivo.</a> Clin Lipidol. 4 (4), 501 (2009).</li><li>Babin, P. J., Vernier, 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=Plasma+lipoproteins+in+fish.">Plasma lipoproteins in fish.</a> J Lipid Res. 30 (4), 467-489 (1989).</li><li>Carten, J. D., Bradford, M. K., Farber, S. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Visualizing+digestive+organ+morphology+and+function+using+differential+fatty+acid+metabolism+in+live+zebrafish.">Visualizing digestive organ morphology and function using differential fatty acid metabolism in live zebrafish.</a> Dev Biol. 360 (2), 276-285 (2011).</li><li>Marza, E., 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=Developmental+expression+and+nutritional+regulation+of+a+zebrafish+gene+homologous+to+mammalian+microsomal+triglyceride+transfer+protein+large+subunit.">Developmental expression and nutritional regulation of a zebrafish gene homologous to mammalian microsomal triglyceride transfer protein large subunit.</a> Dev Dyn. 232 (2), 506-518 (2005).</li><li>Stoletov, K., 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=Vascular+lipid+accumulation,+lipoprotein+oxidation,+and+macrophage+lipid+uptake+in+hypercholesterolemic+zebrafish.">Vascular lipid accumulation, lipoprotein oxidation, and macrophage lipid uptake in hypercholesterolemic zebrafish.</a> Circ Res. 104 (8), 952-960 (2009).</li><li>Fang, L., 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=Programming+effects+of+high-carbohydrate+feeding+of+larvae+on+adult+glucose+metabolism+in+zebrafish,+Danio+rerio.">Programming effects of high-carbohydrate feeding of larvae on adult glucose metabolism in zebrafish, Danio rerio.</a> Br J Nutr. 111 (5), 808-818 (2014).</li><li>Wang, Z., Mao, Y., Cui, T., Tang, D., Wang, X. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Impact+of+a+combined+high+cholesterol+diet+and+high+glucose+environment+on+vasculature.">Impact of a combined high cholesterol diet and high glucose environment on vasculature.</a> PLoS One. 8 (12), 81485 (2013).</li><li>Fang, L., 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=In+vivo+visualization+and+attenuation+of+oxidized+lipid+accumulation+in+hypercholesterolemic+zebrafish.">In vivo visualization and attenuation of oxidized lipid accumulation in hypercholesterolemic zebrafish.</a> J Clin Invest. 121 (12), 4861-4869 (2011).</li><li>Curado, S., 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=Conditional+targeted+cell+ablation+in+zebrafish:+a+new+tool+for+regeneration+studies.">Conditional targeted cell ablation in zebrafish: a new tool for regeneration studies.</a> Dev Dyn. 236 (4), 1025-1035 (2007).</li><li>Pisharath, H., Rhee, J. M., Swanson, M. A., Leach, S. D., Parsons, M. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Targeted+ablation+of+beta+cells+in+the+embryonic+zebrafish+pancreas+using+E.+coli+nitroreductase.">Targeted ablation of beta cells in the embryonic zebrafish pancreas using E. coli nitroreductase.</a> Mech Dev. 124 (3), 218-229 (2007).</li><li>Passeri, M. J., Cinaroglu, A., Gao, C., Sadler, K. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Hepatic+steatosis+in+response+to+acute+alcohol+exposure+in+zebrafish+requires+sterol+regulatory+element+binding+protein+activation.">Hepatic steatosis in response to acute alcohol exposure in zebrafish requires sterol regulatory element binding protein activation.</a> Hepatology. 49 (2), 443-452 (2009).</li><li>Sadler, K. C., Amsterdam, A., Soroka, C., Boyer, J., Hopkins, N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+genetic+screen+in+zebrafish+identifies+the+mutants+vps18,+nf2+and+foie+gras+as+models+of+liver+disease.">A genetic screen in zebrafish identifies the mutants vps18, nf2 and foie gras as models of liver disease.</a> Development. 132 (15), 3561-3572 (2005).</li><li>Matthews, R. P., 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=TNFalpha-dependent+hepatic+steatosis+and+liver+degeneration+caused+by+mutation+of+zebrafish+S-adenosylhomocysteine+hydrolase.">TNFalpha-dependent hepatic steatosis and liver degeneration caused by mutation of zebrafish S-adenosylhomocysteine hydrolase.</a> Development. 136 (5), 865-875 (2009).</li><li>Oka, 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=Diet-induced+obesity+in+zebrafish+shares+common+pathophysiological+pathways+with+mammalian+obesity.">Diet-induced obesity in zebrafish shares common pathophysiological pathways with mammalian obesity.</a> BMC Physiol. 10, 21 (2010).</li><li>Chu, C. Y., 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=Overexpression+of+Akt1+enhances+adipogenesis+and+leads+to+lipoma+formation+in+zebrafish.">Overexpression of Akt1 enhances adipogenesis and leads to lipoma formation in zebrafish.</a> PLoS One. 7 (5), 36474 (2012).</li><li>Song, Y., Cone, R. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Creation+of+a+genetic+model+of+obesity+in+a+teleost.">Creation of a genetic model of obesity in a teleost.</a> FASEB J. 21 (9), 2042-2049 (2007).</li><li>Watts, S. A., Powell, M., D'Abramo, L. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fundamental+approaches+to+the+study+of+zebrafish+nutrition.">Fundamental approaches to the study of zebrafish nutrition.</a> ILAR J. 53 (2), 144-160 (2012).</li><li>Farber, S. A., 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=Genetic+analysis+of+digestive+physiology+using+fluorescent+phospholipid+reporters.">Genetic analysis of digestive physiology using fluorescent phospholipid reporters.</a> Science. 292 (5520), 1385-1388 (2001).</li><li>Miyares, R. L., de Rezende, V. B., Farber, S. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Zebrafish+yolk+lipid+processing:+a+tractable+tool+for+the+study+of+vertebrate+lipid+transport+and+metabolism.">Zebrafish yolk lipid processing: a tractable tool for the study of vertebrate lipid transport and metabolism.</a> Dis Model Mech. 7 (7), 915-927 (2014).</li><li>Otis, J. P., 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=Zebrafish+as+a+model+for+apolipoprotein+biology:+comprehensive+expression+analysis+and+a+role+for+ApoA-IV+in+regulating+food+intake.">Zebrafish as a model for apolipoprotein biology: comprehensive expression analysis and a role for ApoA-IV in regulating food intake.</a> Dis Model Mech. 8 (3), 295-309 (2015).</li><li>Bligh, E., Dyer, W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+rapid+method+of+total+lipid+extraction+and+purification.">A rapid method of total lipid extraction and purification.</a> Can. J. Biochem. Physiol. 37, 911-918 (1959).</li><li>Otis, J. P., Farber, S. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Imaging+vertebrate+digestive+function+and+lipid+metabolism.">Imaging vertebrate digestive function and lipid metabolism.</a> Drug Discov Today Dis Models. 10 (1), (2013).</li><li>Andre, M., 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=Intestinal+fatty+acid+binding+protein+gene+expression+reveals+the+cephalocaudal+patterning+during+zebrafish+gut+morphogenesis.">Intestinal fatty acid binding protein gene expression reveals the cephalocaudal patterning during zebrafish gut morphogenesis.</a> Int J Dev Biol. 44 (2), 249-252 (2000).</li><li>Shimada, Y., Hirano, M., Nishimura, Y., Tanaka, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+high-throughput+fluorescence-based+assay+system+for+appetite-regulating+gene+and+drug+screening.">A high-throughput fluorescence-based assay system for appetite-regulating gene and drug screening.</a> PLoS One. 7 (12), 52549 (2012).</li></ol>

Las técnicas descritas aquí permiten a los investigadores tratan larvas de pez cebra con una alimentación rica en lípidos, visualizar el procesamiento de los lípidos de la dieta en larvas vivas, y cuantificar la ingesta de alimentos de las larvas. Para asegurar el éxito, se debe prestar especial atención a varios pasos críticos. huevos de gallina comerciales varían; para minimizar la variabilidad potencial llevamos a cabo todos los ensayos en los huevos orgánicos de gallinas libres de jaulas que no han sido en...

Los mecanismos por los que el intestino regula el procesamiento de lípidos de la dieta, el hígado controles complejos síntesis de lípidos y metabolismo de las lipoproteínas, y cómo estos órganos trabajan con el sistema nervioso central para controlar la ingesta de alimentos se conocen por completo. Es de interés biomédico para dilucidar esta biología a la luz de la actual epidemia de la obesidad, las enfermedades cardiovasculares, la diabetes y la enfermedad de hígado graso no alcohólica. Los estudios en cultivos celulares y en ratones han proporcionado la mayor parte de nuestra comprensión de las relaciones mecánicas entre lípidos de la dieta y la enfermedad, y el pez cebra (Danio rerio) están emergiendo como un modelo ideal para complementar este trabajo. El pez cebra tiene gastrointestinal similar (GI) los órganos, el metabolismo de los lípidos, y el transporte de lipoproteínas de vertebrados superiores a 1,2, se desarrollan rápidamente y son genéticamente manejable. La claridad óptica de la larvas de pez cebra facilita los estudios in vivo, una particulaventaja r para el estudio del sistema GI como su medio extracelular (es decir, la bilis, microbiota, la señalización endocrina) es prácticamente imposible de modelo ex vivo. De acuerdo, un cuerpo de investigación combinando la tratabilidad genética y condiciones favorables para imágenes en directo de las larvas de pez cebra con una variedad de manipulaciones de la dieta (alto contenido de grasa, 3,4 -colesterol 5 y dietas -carbohydrate 6,7), y modelos de enfermedad cardiovascular 8, la diabetes 9,10, esteatosis hepática 11-13, 14-16 y la obesidad, están emergiendo para proporcionar una gran cantidad de puntos de vista metabólico. Un aspecto esencial de la transición de la larvas de pez cebra en la investigación metabólica es la optimización de las técnicas desarrolladas en otros animales modelo al pez cebra y el desarrollo de nuevos ensayos que explotan las ventajas únicas de la pez cebra. Este protocolo presenta técnicas desarrollados y optimizados para alimentar larvas de pez cebra un lipid-rica comida, visualizar el procesamiento de lípidos de la dieta de todo el cuerpo de la resolución subcelular, y miden la ingesta de alimentos. yema de huevo de pollo fue elegido para componer la comida rica en lípidos, ya que contiene altos niveles de grasas y colesterol (lípidos componen ~ 58% de yema de huevo de gallina, de los cuales ~ 5% es el colesterol, 60% son triglicéridos, y 35% son fosfolípidos ). Yema de huevo de pollo proporciona más grasa que los alimentos típicos comerciales de pez cebra de microgránulos (~ 15% de lípidos) y la ventaja de que es un alimento estandarizado con porcentajes conocidos de especies ácidos grasos específicos, como las dietas de pez cebra y regimientos de alimentación no se han normalizado a través de los laboratorios 17. Por otra parte, los análogos de lípidos fluorescentes previstos en la yema de huevo visualizar el transporte y la acumulación de lípidos de la dieta 18, los componentes celulares de imagen incluyendo gotitas de lípidos, actuando ambos colorantes vitales 3 y a través de la incorporación covalente en lípidos complejos, investigar el metabolismo a través de cromatografía en capa fina (TLC) 19 </sup&gt; Y cromatografía líquida de alta resolución (HPLC) (SAF datos no publicados), y proporcionar un ensayo cuantitativo para la ingesta total de alimentos 20.

<table border="0" cellpadding="0" cellspacing="0" width="832">
	<tbody>
		<tr height="40">
			<td height="40" style="height:40px;width:231px;">Tricaine (ethyl 3-aminobenzoate methanesulofnate salt)</td>
			<td style="width:143px;">Sigma-Aldrich</td>
			<td style="width:127px;">A5040-25G</td>
			<td style="width:335px;">Anesthesia for larval zebrafish</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:231px;">Chicken eggs</td>
			<td style="width:143px;">N/A</td>
			<td style="width:127px;">N/A</td>
			<td>Organic, cage-free eggs, not enriched for omege-3 fatty acids</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:231px;">Ultrasonic processor 3000 sonicator</td>
			<td style="width:143px;">Misonix, Inc.</td>
			<td style="width:127px;">S-3000</td>
			<td>To make egg yolk liposomes</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:231px;">Sonabox acoustic enclosure</td>
			<td style="width:143px;">Misonix, Inc.</td>
			<td style="width:127px;">432B</td>
			<td>To make egg yolk liposomes</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:231px;">1/8&#8221; tapered microtip</td>
			<td style="width:143px;">Misonix, Inc.</td>
			<td style="width:127px;">419</td>
			<td>To make egg yolk liposomes</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:231px;">Amber vials (4 ml, glass)</td>
			<td style="width:143px;">National Scientific</td>
			<td style="width:127px;">13-425</td>
			<td>Lipid storage; includes vials, open-top caps, and cap septa</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:231px;">Incu-Shaker Mini&#160;</td>
			<td style="width:143px;">Benchmark</td>
			<td style="width:127px;">1222U12</td>
			<td>Incubated shaker for feeds</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:231px;">BODIPY FL C16&#160;</td>
			<td style="width:143px;">Thermo Fisher Scientific</td>
			<td style="width:127px;">D3821</td>
			<td>Fluorescent lipid analog; (4,4-Difluoro-5,7-Dimethyl-4-Bora-3a,4a-Diaza-s-Indacene-3-Hexadecanoic Acid)</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:231px;">BODIPY FL C12&#160;</td>
			<td style="width:143px;">Thermo Fisher Scientific</td>
			<td style="width:127px;">D3822</td>
			<td>Fluorescent lipid analog; (4,4-Difluoro-5,7-Dimethyl-4-Bora-3a,4a-Diaza-s-Indacene-3-Dodecanoic Acid)</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:231px;">BODIPY FL C5&#160;</td>
			<td style="width:143px;">Thermo Fisher Scientific</td>
			<td style="width:127px;">D3834</td>
			<td>Fluorescent lipid analog; (4,4-Difluoro-5,7-Dimethyl-4-Bora-3a,4a-Diaza-s-Indacene-3-Pentanoic Acid)</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:231px;">BODIPY FL C5</td>
			<td style="width:143px;">Thermo Fisher Scientific</td>
			<td style="width:127px;">D2183</td>
			<td>Fluorescent lipid analog; (4,4-Difluoro-5,7-Dimethyl-4-Bora-3a,4a-Diaza-s-Indacene-3-Propionic Acid)</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:231px;">TopFluor cholesterol&#160;</td>
			<td style="width:143px;">Avanti Polar Lipids Inc.</td>
			<td style="width:127px;">810255</td>
			<td>Fluorescent lipid analog; 23-(dipyrrometheneboron difluoride)-24-norcholesterol</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:231px;">Fatty acid-free BSA</td>
			<td>Sigma-Aldrich</td>
			<td style="width:127px;">A0281-1G</td>
			<td>For TopFluor cholesterol solubilization</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:231px;">Methyl cellulose</td>
			<td>Sigma-Aldrich</td>
			<td style="width:127px;">M0387</td>
			<td>Mounting media for live larval imaging; 75 x 25 x 1 mm</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:231px;">Low melt agarose</td>
			<td style="width:143px;">Thermo Fisher Scientific</td>
			<td style="width:127px;">BP165-25</td>
			<td>Mounting media for live larval imaging; 22 x 30</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:231px;">VWR microscope slides&#160;</td>
			<td style="width:143px;">VWR&#160;</td>
			<td style="width:127px;">16004-422</td>
			<td>Mounting larvae for live imaging</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:231px;">Coverslips&#160;</td>
			<td style="width:143px;">Cover Glass</td>
			<td style="width:127px;">12-544A</td>
			<td>Mounting larvae for live imaging</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:231px;">Super glue</td>
			<td style="width:143px;">Loctite</td>
			<td style="width:127px;">LOC01-30379</td>
			<td>Mounting larvae for live imaging</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:231px;">FluoroDish (glass bottom dish)</td>
			<td style="width:143px;">World Precision Instruments, Inc.&#160;</td>
			<td style="width:127px;">FD35-100</td>
			<td>Mounting larvae for live imaging; 35 mm dish, 23 mm glass, 0.17 mm glass thickness&#160;&#160;</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:231px;">Confocal microscope</td>
			<td>Leica Microsytems</td>
			<td style="width:127px;">SP-2, SP-5</td>
			<td>Microscope for high magnification live imaging</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:231px;">Stereoscope</td>
			<td style="width:143px;">Nikon</td>
			<td style="width:127px;">SM21500</td>
			<td>Microscope for low magnification live imaging</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:231px;">Glass culture tubes&#160;</td>
			<td style="width:143px;">Kimble</td>
			<td style="width:127px;">73500-13100</td>
			<td>Lipid extraction; (13 x 100 mm; 13 ml)</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:231px;">Savant SpeedVac Plus&#160;</td>
			<td style="width:143px;">ThermoQuest</td>
			<td style="width:127px;">SC210A</td>
			<td>Lipid extraction</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:231px;">Channeled TLC plates</td>
			<td style="width:143px;">Whatman Scientific</td>
			<td style="width:127px;">WC4855-821</td>
			<td>Food intake assay; LK5D Silica Gel 150 A, 20 x 20 cm, 250 um thick; Discontinued</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:231px;">Channeled TLC plates</td>
			<td style="width:143px;">Analtech, Inc.</td>
			<td style="width:127px;">66911</td>
			<td>Food intake assay; Direct replacement for Whatman Scientific TLC plates</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Typhoon 9410 Variable Mode Imager</td>
			<td style="width:143px;">GE Healthcare</td>
			<td style="width:127px;">9410</td>
			<td>Fluorescent plate reader for food intake assay</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:231px;">ImageQuant software</td>
			<td style="width:143px;">GE Healthcare</td>
			<td>29000605</td>
			<td>Analysis of food intake assay</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:231px;">5 3/4&#8217; Wide bore, borosilicate disposable pasteur pipets&#160;&#160;&#160;</td>
			<td style="width:143px;">Kimble</td>
			<td style="width:127px;">63A53WT</td>
			<td>Transfering larvae</td>
		</tr>
	</tbody>
</table>

high-fat feeding paradigm for larval zebrafish: feeding, live imaging, and quantification of food intake

Zebrafish are emerging as a model of dietary lipid processing and metabolic disease. This protocol describes how to feed larval zebrafish a lipid-rich meal, which consists of an emulsion of chicken egg yolk liposomes created by sonicating egg yolk in embryo media. Detailed instructions are provided to screen larvae for egg yolk consumption so that larvae that fail to feed will not confound experimental results. The chicken egg yolk liposomes can be spiked with fluorescent lipid analogs, including fatty acids and cholesterol, enabling both systemic and subcellular visualization of dietary lipid processing. Several methods are described to mount larvae that are conducive to short- and long-term live imaging with both upright and inverted objectives at high and low magnification. Additionally presented is an assay to quantify larval food intake by extracting the lipids of larvae fed fluorescent lipid analogs, spotting the lipids on a thin layer chromatography plate, and quantifying the fluorescence. Finally, critical aspects of the procedures, important controls, options for modifying the protocols to address specific experimental questions, and potential limitations are discussed. These techniques can be applied not only to focused, hypothesis driven inquiries, but also to a variety of screens and live imaging techniques to study dietary lipid metabolism and the control of food intake.

Cuando se alimenta en un agitador a 29-31 ° C, la mayoría de las larvas sanas (≥95%) va a comer dentro de 1 hora. Al consumir la emulsión de yema de huevo, el intestino de las larvas se oscurece. Muy intestinos oscuros pueden ser observadas a las 2 horas (Figura 1). Si las larvas son sin comer o dejar de comer, el intestino sigue siendo clara. Las larvas alimentadas huevo blanco exhibición distendido lumen intestinal que no se oscurece en color. <p class="jove_content" fo:keep-together.within-...

Watch this Scientific Journal Video about High-fat Feeding Paradigm for Larval Zebrafish: Feeding, Live Imaging, and Quantification of Food Intake at JoVE.com

High-fat Feeding Paradigm for Larval Zebrafish: Feeding, Live Imaging, and Quantification of Food Intake

Zebrafish are emerging as a valuable model of dietary lipid processing and metabolic disease. Described are protocols of lipid-rich larval feeds, live imaging of dietary fluorescent lipid analogs, and quantification of food intake. These techniques can be applied to a variety of screening, imaging, and hypothesis driven inquiry techniques.

La alimentación de las larvas de pez cebra paradigma para la alta en grasas: Alimentación, imágenes en vivo, y Cuantificación de la ingesta de alimentos

Zebrafish are emerging as a model of dietary lipid processing and metabolic disease. This protocol describes how to feed larval zebrafish a lipid-rich ...

Research

JoVE Journal

Biology

Live Imaging of the Zebrafish Embryonic Brain by Confocal Microscopy

Imágenes en vivo del cerebro del embrión de pez cebra mediante microscopía confocal

In this video, we demonstrate the method our lab has developed to analyze the cell shape changes and rearrangements required to bend and fold the ...

Investigación

Biología

Detection of Live Escherichia coli O157:H7 Cells by PMA-qPCR

Detection of Live Escherichia coli O157:H7 Cells by PMA-qPCR

La detección de vivo<em&gt; Escherichia coli</em&gt; O157: H7 células por PMA-qPCR

A unique open reading frame (ORF) Z3276 was identified as a specific genetic marker for E. coli O157:H7. A qPCR assay was developed for detection of E. ...

Measuring Glutathione-induced Feeding Response in Hydra

Medición inducida glutatión-Alimentación Respuesta en Hydra

Hydra is among the most primitive organisms possessing a nervous system and chemosensation for detecting reduced glutathione (GSH) for capturing the prey. ...

Real-time In Vivo Recording of Arabidopsis Calcium Signals During Insect Feeding Using a Fluorescent Biosensor

Real-time In Vivo Recording of Arabidopsis Calcium Signals During Insect Feeding Using a Fluorescent Biosensor

En tiempo real en Vivo la grabación de señales de calcio Arabidopsis durante la alimentación de insectos utilizando un Biosensor fluorescente

Calcium ions are predicted to be key signaling entities during biotic interactions, with calcium signaling forming an established part of the plant ...

A Bacterial Oral Feeding Assay with Antibiotic-Treated Mosquitoes

Un ensayo de alimentación oral bacteriana con mosquitos tratados con antibióticos

The mosquito midgut harbors a highly dynamic microbiome that affects the host metabolism, reproduction, fitness, and vector competence. Studies have been ...

Plasmodium falciparum Gametocyte Culture and Mosquito Infection Through Artificial Membrane Feeding

Plasmodium falciparum Gametocyte Culture and Mosquito Infection Through Artificial Membrane Feeding

Plasmodium falciparum Cultivo de gametocitos e infección por mosquitos a través de la alimentación artificial por membrana

Malaria remains one of the most important public health problems, causing significant morbidity and mortality. Malaria is a mosquito borne disease ...

Tick Artificial Membrane Feeding for Ixodes scapularis

Tick Artificial Membrane Feeding for Ixodes scapularis

Alimentación por membrana artificial contra garrapatas para Ixodes scapularis

Ticks and their associated diseases are an important topic of study due to their public health and veterinary burden. However, the feeding requirements of ...

Manipulation of Rhythmic Food Intake in Mice Using a Custom-Made Feeding System

Manipulación de la ingesta rítmica de alimentos en ratones utilizando un sistema de alimentación hecho a medida

Rhythmic gene expression is a hallmark of the circadian rhythm and is essential for driving the rhythmicity of biological functions at the appropriate ...

Assessment of Phytochemical Effects on Helicoverpa armigera Through Feeding Assay

Developing a Feeding Assay System for Evaluating the Insecticidal Effect of Phytochemicals on Helicoverpa armigera

Development and Challenges of Feeding Assays for Insect Pest Management (Video) | JoVE

Desarrollo de un sistema de ensayo de alimentación para evaluar el efecto insecticida de los fitoquímicos en Helicoverpa armigera

Helicoverpa armigera, a lepidopteran insect, is a polyphagous pest with a worldwide distribution. This herbivorous insect is a threat to plants and ...

Ex Situ Culture of Pocillopora acuta and Effective Feeding Techniques

Effective Techniques for the Feeding and Ex Situ Culture of a Brooding Scleractinian Coral, Pocillopora acuta

Advancing Coral Research by Exploring Climate Change Resistance, Ex Situ Aquaculture, and Reproduction Strategies (Video) | JoVE

Técnicas efectivas para la alimentación y el cultivo ex situ de un coral escleractiniano incubador, Pocillopora acuta

Climate change is affecting the survival, growth, and recruitment of corals globally, with large-scale shifts in abundance and community composition ...