Los autores reconocen con gratitud el trabajo de Liuliu Zheng y Zenghui Xue, que ayudaron a ser pioneros en esta técnica en el laboratorio Sokac, así como de Hasan Seede, quien ayudó con el análisis. El trabajo para este estudio está financiado por una subvención de NIH (R01 GM115111).

<ol>
	<li>Figard, 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=Cofilin-mediated+Actin+Stress+Response+is+maladaptive+in+heat-stressed+embryos.">Cofilin-mediated Actin Stress Response is maladaptive in heat-stressed embryos.</a> Cell Reports. 26 (49), 3493-3501 (2019).</li><li>Ashworth, S. 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=ADF/cofilin+mediates+actin+cytoskeletal+alterations+in+LLC-PK+cells+during+ATP+depletion.">ADF/cofilin mediates actin cytoskeletal alterations in LLC-PK cells during ATP depletion.</a> American Journal of Physiology Renal Physiology. 284 (4), 852-862 (2003).</li><li>Vandebrouck, 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=In+vitro+analysis+of+rod+composition+and+actin+dynamics+in+inherited+myopathies.">In vitro analysis of rod composition and actin dynamics in inherited myopathies.</a> Journal of Neuropathology and Experimental Neurology. 69 (5), 429-441 (2010).</li><li>Minamide, L. S., Striegl, A. M., Boyle, J. A., Meberg, P. J., Bamburg, J. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Neurodegenerative+stimuli+induce+persistent+ADF/cofilin-actin+rods+that+disrupt+distal+neurite+function.">Neurodegenerative stimuli induce persistent ADF/cofilin-actin rods that disrupt distal neurite function.</a> Nature Cell Biology. 2 (9), 628-636 (2000).</li><li>Bamburg, J. R., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=ADF/Cofilin-actin+rods+in+neurodegenerative+diseases.">ADF/Cofilin-actin rods in neurodegenerative diseases.</a> Current Alzheimer Research. 7 (3), 241-250 (2010).</li><li>Bamburg, J. R., Bernstein, B. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Actin+dynamics+and+cofilin-actin+rods+in+alzheimer+disease.">Actin dynamics and cofilin-actin rods in alzheimer disease.</a> Cytoskeleton. 73 (9), 477-497 (2016).</li><li>Bernstein, B. W., Chen, H., Boyle, J. A., Bamburg, J. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Formation+of+actin-ADF/cofilin+rods+transiently+retards+decline+of+mitochondrial+potential+and+ATP+in+stressed+neurons.">Formation of actin-ADF/cofilin rods transiently retards decline of mitochondrial potential and ATP in stressed neurons.</a> AJP: Cell Physiology. 291 (5), 828-839 (2006).</li><li>Munsie, L. N., Desmond, C. R., Truant, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cofilin+nuclear-cytoplasmic+shuttling+affects+cofilin-actin+rod+formation+during+stress.">Cofilin nuclear-cytoplasmic shuttling affects cofilin-actin rod formation during stress.</a> Journal of Cell Science. 125 (17), 3977-3988 (2012).</li><li>Iida, K., Iida, H., Yahara, I. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Heat+shock+induction+of+intranuclear+actin+rods+in+cultured+mammalian+cells.">Heat shock induction of intranuclear actin rods in cultured mammalian cells.</a> Experimental Cell Research. 165, 207-215 (1986).</li><li>Ohta, Y., Nishida, E., Sakai, H., Miyamoto, E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Dephosphorylation+of+cofilin+accompanies+heat+shock-induced+nuclear+accumulation+of+cofilin.">Dephosphorylation of cofilin accompanies heat shock-induced nuclear accumulation of cofilin.</a> Journal of Biological Chemistry. 264 (27), 16143-16148 (1989).</li><li>Iida, K., Matsumoto, S., Yahara, I. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+KKRKK+sequence+is+involved+in+heat+shock-induced+nuclear+translocation+of+the+18-kDa+actin-binding+protein,+cofilin.">The KKRKK sequence is involved in heat shock-induced nuclear translocation of the 18-kDa actin-binding protein, cofilin.</a> Cell Structure and Function. 17 (1), 39-46 (1992).</li><li>Minamide, L. 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=Isolation+and+characterization+of+cytoplasmic+cofilin-actin+rods.">Isolation and characterization of cytoplasmic cofilin-actin rods.</a> Journal of Biological Chemistry. 285 (8), 5450-5460 (2010).</li><li>Masurovsky, E. B., Benitez, H. H., Kim, S. U., Murray, M. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Origin,+development,+and+nature+of+intranuclear+rodlets+and+associated+bodies+in+chicken+sympathetic+neurons.">Origin, development, and nature of intranuclear rodlets and associated bodies in chicken sympathetic neurons.</a> The Journal of Cell Biology. 44 (7), 172-191 (1970).</li><li>Feldman, M. L., Peters, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Intranuclear+rods+and+sheets+in+rat+cochlear+nucleus.">Intranuclear rods and sheets in rat cochlear nucleus.</a> Journal of Neurocytology. 1 (2), 109-127 (1972).</li><li>Nishida, 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=Cofilin+is+a+component+of+intranuclear+and+cytoplasmic+actin+rods+induced+in+cultured+cells.">Cofilin is a component of intranuclear and cytoplasmic actin rods induced in cultured cells.</a> Cell Biology. 84 (8), 5262-5266 (1987).</li><li>Ono, S., Abe, H., Nagaoka, R., Obinata, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Colocalization+of+ADF+and+cofilin+in+intranuclear+actin+rods+of+cultured+muscle+cells.">Colocalization of ADF and cofilin in intranuclear actin rods of cultured muscle cells.</a> Journal of Muscle Research and Cell Motility. 14 (2), 195-204 (1993).</li><li>Xue, Z., Sokac, A. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Back-to-back+mechanisms+drive+actomyosin+ring+closure+during+Drosophila+embryo+cleavage.">Back-to-back mechanisms drive actomyosin ring closure during Drosophila embryo cleavage.</a> The Journal of Cell Biology. 215 (3), 335-344 (2016).</li><li>Cao, J., Albertson, R., Riggs, B., Field, C. M., Sullivan, W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Nuf,+a+Rab11+effector,+maintains+cytokinetic+furrow+integrity+by+promoting+local+actin+polymerization.">Nuf, a Rab11 effector, maintains cytokinetic furrow integrity by promoting local actin polymerization.</a> Journal of Cell Biology. 182 (2), 301-313 (2008).</li><li>Spracklen, A. J., Fagan, T. N., Lovander, K. E., Tootle, T. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+pros+and+cons+of+common+actin+labeling+tools+for+visualizing+actin+dynamics+during+Drosophila+oogenesis.">The pros and cons of common actin labeling tools for visualizing actin dynamics during Drosophila oogenesis.</a> Developmental Biology. 393 (2), 209-226 (2014).</li><li>Chen, Q., Nag, S., Pollard, T. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Formins+filter+modified+actin+subunits+during+processive+elongation.">Formins filter modified actin subunits during processive elongation.</a> Journal of Structural Biology. 177 (1), 32-39 (2012).</li><li>Iordanou, E., Chandran, R. R., Blackstone, N., Jiang, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=RNAi+interference+by+dsRNA+injection+into+Drosophila+embryos.">RNAi interference by dsRNA injection into Drosophila embryos.</a> Journal of Visualized Experiments. (50), 2477 (2011).</li><li>Juarez, M. T., Patterson, R. A., Li, W., McGinnis, W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Microinjection+wound+assay+and+in+vivo+localization+of+epidermal+wound+response+reporters+in+Drosophila+embryos.">Microinjection wound assay and in vivo localization of epidermal wound response reporters in Drosophila embryos.</a> Journal of Visualized Experiments. 81, 50750 (2013).</li><li>Carreira-Rosario, 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=Recombineering+homologous+recombination+constructs+in+Drosophila.">Recombineering homologous recombination constructs in Drosophila.</a> Journal of Visualized Experiments. (77), 50346 (2013).</li><li>Brust-Mascher, I., Scholey, 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=Microinjection+techniques+for+studying+mitosis+in+the+Drosophila+melanogaster+syncytial+embryo.">Microinjection techniques for studying mitosis in the Drosophila melanogaster syncytial embryo.</a> Journal of Visualized Experiments. (31), 1382 (2009).</li><li>Catrina, I. E., Bayer, L. V., Omar, O. S., Bratu, D. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Visualizing+and+tracking+endogenous+mRNAs+in+live+Drosophila+melanogaster+egg+chambers.">Visualizing and tracking endogenous mRNAs in live Drosophila melanogaster egg chambers.</a> Journal of Visualized Experiments. (148), 58545 (2019).</li><li>Wessel, A. D., Gumalla, M., Grosshans, J., Schmidt, C. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+mechanical+properties+of+early+Drosophila+embryos+measured+by+high-speed+video+microrheology.">The mechanical properties of early Drosophila embryos measured by high-speed video microrheology.</a> Biophysical Journal. 108 (8), 1899-1907 (2015).</li><li>Mollinari, C., Gonz&#225;lez, A., Cid-Arregui, A., Garc&#237;a-Carranc&#225;, <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Microinjection+and+transgenesis.">Microinjection and transgenesis.</a> Microinjection and Transgenesis: Strategies and Protocols. , 587-603 (1998).</li><li>Figard, L., Sokac, A. 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(49), 2503 (2011).</li><li>Oesterle, 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> Pipette Cookbook 2018: P-97 and P-1000 Micropipette Pullers. , (2018).</li><li>Bownes, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+photographic+study+of+development+in+the+living+embryo+of+Drosophila+melanogaster.">A photographic study of development in the living embryo of Drosophila melanogaster.</a> Journal of Embryology and Experimental Morphology. 33 (3), 789-801 (1975).</li><li>Powsner, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+effects+of+temperature+on+the+durations+of+the+developmental+stages+of+Drosophila+melanogaster.">The effects of temperature on the durations of the developmental stages of Drosophila melanogaster.</a> Physiological Zoology. 8 (4), 474-520 (1935).</li><li>Hunter, M. V., Willoughby, P. M., Bruce, A. E. E., Fernandez-Gonzalez, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Oxidative+Stress+Orchestrates+Cell+Polarity+to+Promote+Embryonic+Wound+Healing.">Oxidative Stress Orchestrates Cell Polarity to Promote Embryonic Wound Healing.</a> Developmental Cell. 47 (3), 377-387 (2018).</li></ol>

No se declaran conflictos de intereses.

La importancia de este método es que utiliza el protocolo bien establecido de microinyección en embriones de Drosophila 21,22,23,24,25,26,27 para permitir nuevas investigaciones sobre el ASR y el conjunto de barras actin acompañantes. Una ventaja importante de inyectar G-actin<su...

Este protocolo describe cómo inyectar G-actinRojo para visualizar el montaje de barras de actina intranuclear en embriones estresados por calor que están siendo sometidos a una respuesta inducible a la tensión actin (ASR)1. Desarrollamos este protocolo para ayudar a los estudios del ASR, que en embriones conduce a morfosis interrumpida y viabilidad reducida, y en adultos los tipos de células humanas se asocian con patologías como insuficiencia renal2,miopías musculares3,y la enfermedad de Alzheimer y Huntington4,5,6,7,8. Este ASR es inducido por numerosas tensiones celulares, incluyendo choque de calor9,10,11,estrés oxidativo4,6,síntesis ATP reducida12,y huntingtina anormal u oligomerización amiloide β4,5,6,7,9,13,14,15,16. Un sello distintivo del ASR es el montaje de varillas de actina aberrantes en el citoplasma o núcleo de las células afectadas, que es impulsado por la hiperactivación inducida por el estrés de una proteína que interactúa con actina, Cofilina1,5,6,10. Lamentablemente, siguen existiendo lagunas clave en el conocimiento con respecto al ASR. Por ejemplo, se desconoce la función de las varillas actin. No entendemos por qué se forman varillas en el citoplasma de algunos tipos de células, pero el núcleo de otros. Tampoco está claro si el ASR es protector o maladaptivo para las células o embriones sometidos a estrés. Por último, todavía no conocemos los mecanismos detallados subyacentes a la hiperactivación de cofilina o el conjunto de varillas actin. Por lo tanto, este protocolo proporciona un ensayo rápido y versátil para sondear el ASR visualizando la formación de varillas actin y dinámicas en el sistema experimental altamente tractable del embrión de mosca de la fruta viva.
El protocolo para microinyecto G-actinRed en embriones drosophila vivos fue desarrollado inicialmente para estudiar la dinámica de las estructuras normales de actina citoplasmática17 durante eventos de construcción de tejidos. En esos estudios, encontramos que la inyecciónroja de G-actin no afectaba negativamente a los procesos de desarrollo tempranos en el embrión, incluida la citoquinasis o la gastrulación17,18. A continuación, modificamos el protocolo, adaptando el manejo del embrión y la inyección de G-actinrojo para permitir la toma de imágenes de barras de actina en embriones estresados por calor sometidos al ASR1. Otros métodos además de la inyección de G-actinrojo se pueden utilizar para visualizar actina en embriones. Estos métodos se basan en la expresión de proteínas fluorescentes (FPs) etiquetadas para actuar o a dominios de proteínas de unión a la actina, como Utrophin-mCherry, Lifeact, F-tractin-GFP y Moesin-GFP (revisada en19). Sin embargo, el uso de estas sondas FP requiere precaución porque pueden estabilizar o interrumpir algunas estructuras de actina, no etiquetar por igual todas las estructuras de actina20, y en el caso de actin-GFP, son altamente sobreexpresados – problemático para el análisis del conjunto de varillas que no sólo depende del estrés, sino también actuar en la concentración dependiente1. Por lo tanto, G-actinRed es la sonda preferida para estudios de varilla en embriones de mosca, y el gran tamaño del embrión permite su fácil inyección.
El flujo de trabajo de este protocolo es similar a otras técnicas de microinjeción bien establecidas que se han utilizado para inyectar proteínas, ácidos nucleicos, fármacos e indicadores fluorescentes en embriones de Drosophila 21,22,23,24,25,26,27. Sin embargo, después de la microinyección de G-actinRed aquí, los embriones están expuestos a estrés por calor leve para inducir el ASR y el conjunto de varilla de actina intranuclear. Para laboratorios con acceso a moscas y un equipo de inyección, este método debe ser fácilmente implementable y adaptable para líneas de estudio específicas con respecto a la ASR, incluyendo su inducción por diferentes tensiones o modulación en distintos antecedentes genéticos.

<table border="0" cellpadding="0" cellspacing="0" style="width:837px;" width="838">
	<tbody>
		<tr height="40">
			<td height="40" style="height:40px;width:223px;">Adenosine triphosphate (ATP)</td>
			<td style="width:195px;">Millipore-Sigma</td>
			<td style="width:121px;">A23835G</td>
			<td style="width:299px;">Component of G buffer</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:223px;">Apple juice, Mott&#39;s, 64 fl oz</td>
			<td style="width:195px;">Mott&#39;s</td>
			<td style="width:121px;">014800000344</td>
			<td>Component of apple juice plates</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:223px;">Bacto Agar</td>
			<td style="width:195px;">BD</td>
			<td style="width:121px;">214010</td>
			<td>Component of apple juice plates</td>
		</tr>
		<tr height="60">
			<td height="60" style="height:60px;width:223px;">Bleach, PureBright Germicidal, 6.0% sodium hypochlorite</td>
			<td style="width:195px;">KIK International</td>
			<td style="width:121px;">059647210020</td>
			<td>For dechorionating embryos</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:223px;">Calcium chloride</td>
			<td style="width:195px;">Millipore-Sigma</td>
			<td style="width:121px;">C1016500G</td>
			<td>Component of G buffer</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:223px;">Cell strainer, 70 &#956;m</td>
			<td style="width:195px;">Falcon</td>
			<td style="width:121px;">352350</td>
			<td>For collecting dechorionated embryos</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:223px;">Confocal microscope, LSM 880 34-channel with Airyscan</td>
			<td style="width:195px;">Zeiss</td>
			<td style="width:121px;">0000001994956</td>
			<td>For imaging intranuclear actin rods</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:223px;">Desiccant</td>
			<td style="width:195px;">Drierite</td>
			<td style="width:121px;">24001</td>
			<td>For desiccating embryos</td>
		</tr>
		<tr height="60">
			<td height="60" style="height:60px;width:223px;">Dissecting microscope, Stemi 508 Stereoscope with 8:1 zoom</td>
			<td style="width:195px;">Zeiss</td>
			<td style="width:121px;">4350649000000</td>
			<td>For arranging embryos on agar wedge</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:223px;">Dissecting needle, 5 in</td>
			<td style="width:195px;">Fisher Scientific</td>
			<td style="width:121px;">08965A</td>
			<td>For arranging embryos on agar wedge</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:223px;">Dithiothreitol (DTT)</td>
			<td style="width:195px;">Fisher Scientific</td>
			<td style="width:121px;">BP1725</td>
			<td>Component of G buffer</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:223px;">Double-sided Tape, Scotch Permanent, 0.5 in x 250 in</td>
			<td style="width:195px;">3M</td>
			<td>021200010323</td>
			<td>For making embryo glue</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:223px;">Embryo collection cage</td>
			<td style="width:195px;">Genessee Scientific</td>
			<td style="width:121px;">59100</td>
			<td>For housing adult flies and collecting embryos</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:223px;">Fine tip tweezers, Dumont Tweezer, Style 5</td>
			<td style="width:195px;">Electron Microscopy Sciences</td>
			<td style="width:121px;">72701D</td>
			<td>For arranging embryos on agar wedge</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:223px;">Glass capillaries, Borosillicate glass, thin 1 mm x 0.75 mm</td>
			<td style="width:195px;">World Precision Instruments, Inc.</td>
			<td style="width:121px;">TW1004</td>
			<td>For microneedles</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:223px;">Halocarbon oil 27</td>
			<td style="width:195px;">Millipore-Sigma</td>
			<td style="width:121px;">H8773100ML</td>
			<td>For hydration of embryos</td>
		</tr>
		<tr height="120">
			<td height="120" style="height:120px;width:223px;">Heated stage incubator</td>
			<td style="width:195px;">Zeiss</td>
			<td style="width:121px;">4118579020000, 4118609020000, 4118609010000</td>
			<td>For confocal imaging</td>
		</tr>
		<tr height="18">
			<td height="18" style="height:19px;width:223px;">Lab Tissue Wipers, KimWipes</td>
			<td style="width:195px;">Kimberly-Clark</td>
			<td style="width:121px;">34155</td>
			<td>Lab tissue wipers</td>
		</tr>
		<tr height="60">
			<td height="60" style="height:60px;width:223px;">Light microscope, Invertoskop 40C Inverted Phase contrast microscope, refurbished</td>
			<td style="width:195px;">Zeiss</td>
			<td style="width:121px;">Discontinued</td>
			<td>Injection microscope</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:223px;">Methyl-4-hydroxybenzoate</td>
			<td style="width:195px;">Millipore-Sigma</td>
			<td style="width:121px;">H36471KG</td>
			<td>Component of apple juice plates</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:223px;">Microinjector, FemtoJet4x</td>
			<td style="width:195px;">Eppendorf</td>
			<td>5253000025</td>
			<td>Microinjector</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:223px;">Micro loader tips, epT.I.P.S. 20 &#956;L</td>
			<td style="width:195px;">Eppendorf</td>
			<td style="width:121px;">5242956003</td>
			<td>For loading microneedles</td>
		</tr>
		<tr height="60">
			<td height="60" style="height:60px;width:223px;">Micromanipulator and injection stage with x,y,z dials for needle adjustment</td>
			<td style="width:195px;">Bernard Instruments, Inc (Houston, TX)</td>
			<td style="width:121px;">Custom</td>
			<td>For performing microinjections</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:223px;">Micropipette puller, Model P-97, Flaming/Brown</td>
			<td style="width:195px;">Sutter Instruments</td>
			<td style="width:121px;">P97</td>
			<td>For pulling capillary tubes to make microneedles</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:223px;">Microscope cover glass 24x50-1.5</td>
			<td style="width:195px;">Fisher Scientific</td>
			<td style="width:121px;">12544E</td>
			<td>For mounting embryos</td>
		</tr>
		<tr height="60">
			<td height="60" style="height:60px;width:223px;">Microscope slides, Lilac Colorfrost, Precleaned, 25 x 75 x 1mm</td>
			<td style="width:195px;">Fisher Scientific</td>
			<td style="width:121px;">22037081</td>
			<td>For mounting embryos for injection</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:223px;">n-Heptane</td>
			<td style="width:195px;">Fisher Scientific</td>
			<td style="width:121px;">H3601</td>
			<td>Component of embryo glue</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:223px;">Objective, 10x</td>
			<td style="width:195px;">Zeiss</td>
			<td style="width:121px;">Discontinued</td>
			<td>10x objective for injection microscope</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:223px;">Objective, C-Apochromat 40x/1,2 W Korr. FCS</td>
			<td style="width:195px;">Zeiss</td>
			<td style="width:121px;">4217679971711</td>
			<td>40x water objective for confocal</td>
		</tr>
		<tr height="41">
			<td height="41" style="height:41px;width:223px;">Objective, LD LCI Plan-Apochromat 25x/0.8 Imm Cor DIC M27 for oil, water, silicone oil or glycerine immersion (D=0-0.17mm) (WD=0.57mm at D=0.17mm)</td>
			<td style="width:195px;">Zeiss</td>
			<td style="width:121px;">4208529871000</td>
			<td>25x mixed immersion objective for confocal</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:223px;">Objective, Plan-Apocrhomat 63x/1.40 Oil DIC f/ELYRA</td>
			<td style="width:195px;">Zeiss</td>
			<td style="width:121px;">4207829900799</td>
			<td>63x oil objective for confocal</td>
		</tr>
		<tr height="60">
			<td height="60" style="height:60px;width:223px;">Paintbrush, Robert Simmons Expression E85 Pointed Round size 2</td>
			<td style="width:195px;">Daler-Rowney</td>
			<td style="width:121px;">038372016954</td>
			<td>For transferring embryos</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:223px;">Paper towels, Kleenex C-fold paper towels, white</td>
			<td style="width:195px;">Kimberly-Clark</td>
			<td style="width:121px;">884266344845</td>
			<td>For blotting cell strainer</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:223px;">Pasteur pipette, 5 3/4 in</td>
			<td style="width:195px;">Fisher Scientific</td>
			<td style="width:121px;">1367820A</td>
			<td>For covering embryos with oil</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:223px;">Petri dish, glass, 100 x 20 mm</td>
			<td style="width:195px;">Corning</td>
			<td style="width:121px;">3160102</td>
			<td>For humid incubation chamber</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:223px;">Petri dish, plastic, 60 x 15 mm</td>
			<td style="width:195px;">VWR</td>
			<td style="width:121px;">25384092</td>
			<td>For apple juice plates</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:223px;">Pipette, Eppendorf Reference 0.5-10 &#956;L</td>
			<td style="width:195px;">Eppendorf</td>
			<td style="width:121px;">2231000604</td>
			<td>For loading the microneedle</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:223px;">Pipette tip, xTIP4 250 &#956;L</td>
			<td style="width:195px;">Biotix</td>
			<td style="width:121px;">63300006</td>
			<td>For adding embryo glue to coverslip</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:223px;">Razor blade</td>
			<td style="width:195px;">VWR</td>
			<td style="width:121px;">55411050</td>
			<td>For cutting agar wedge, tape, pipette tips</td>
		</tr>
		<tr height="60">
			<td height="60" style="height:60px;width:223px;">Rhodamine-conjugated globular actin, human platelet (non-muscle; 4x10 &#956;g)</td>
			<td style="width:195px;">Cytoskeleton, Inc.</td>
			<td style="width:121px;">APHR-A</td>
			<td>G-actin^Red</td>
		</tr>
		<tr height="60">
			<td height="60" style="height:60px;width:223px;">Scintillation vial, 20 mL Glass borosillicate with polyethylene liner and urea caps</td>
			<td style="width:195px;">Fisher Scientific</td>
			<td style="width:121px;">033377</td>
			<td>For making embryo glue</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:223px;">Screw top jar, 16 oz</td>
			<td style="width:195px;">Nalgene</td>
			<td style="width:121px;">000194414195</td>
			<td>For desiccating embryos</td>
		</tr>
		<tr height="40">
			<td height="40" style="height:40px;width:223px;">Stage micrometer</td>
			<td style="width:195px;">Electron Microscopy Sciences</td>
			<td style="width:121px;">602104PG</td>
			<td>For calibrating volume of G-actin injection</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:223px;">Sucrose</td>
			<td style="width:195px;">Millipore-Sigma</td>
			<td style="width:121px;">840971KG</td>
			<td>Component of apple juice plates</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:223px;">Trizma base</td>
			<td style="width:195px;">Millipore-Sigma</td>
			<td style="width:121px;">T15031KG</td>
			<td>Component of G buffer</td>
		</tr>
		<tr height="60">
			<td height="60" style="height:60px;width:223px;">Yeast, Lesaffre Yeast Corporation Yeast, Red Star Active Dry, 32 oz</td>
			<td style="width:195px;">Lesaffre Yeast Corporation</td>
			<td style="width:121px;">117929157002</td>
			<td>Component of yeast paste</td>
		</tr>
	</tbody>
</table>

imaging intranuclear actin rods in live heat stressed drosophila embryos

El propósito de este protocolo es visualizar varillas de actina intranuclear que se ensamblan en embriones drosophila melanogaster vivos después del estrés térmico. Las barras actin son un sello distintivo de una respuesta al estrés actin (ASR) conservada e inducible que acompaña a las patologías humanas, incluida la enfermedad neurodegenerativa. Anteriormente, demostramos que el ASR contribuye a fallos de morfosis y a una menor viabilidad del desarrollo de embriones. Este protocolo permite el estudio continuo de los mecanismos subyacentes al montaje de varillas actin y el ASR en un sistema modelo que es altamente apto para la creación de imágenes, genética y bioquímica. Los embriones se recogen y montan en una cubierta para prepararlos para la inyección. La actina globulaular conjugada con rhodamina (G-actinrojo)se diluye y se carga en un microneedle. Se realiza una sola inyección en el centro de cada embrión. Después de la inyección, los embriones se incuban a temperatura elevada y las barras de actina intranuclear se visualizan mediante microscopía confocal. La recuperación de fluorescencia después de los experimentos de fotobleaching (FRAP) se puede realizar en las barras actin; y otras estructuras ricas en actina en el citoplasma también se pueden imaginar. Encontramos que G-actinRed polimeriza como G-actin endógeno y no interfiere, por sí solo, con el desarrollo normal de embriones. Una limitación de este protocolo es que se debe tener cuidado durante la inyección para evitar lesiones graves en el embrión. Sin embargo, con la práctica, inyectar G-actinrojo en embriones de Drosophila es una manera rápida y confiable de visualizar varillas de actina y se puede utilizar fácilmente con moscas de cualquier genotipo o con la introducción de otras tensiones celulares, incluyendo hipoxia y estrés oxidativo.

Un flujo de trabajo esquemático de manejo de embriones se representa en la Figura 1y se presenta un calendario para un experimento típico en la Tabla 1. Una estimación para un buen resultado experimental es que por cada 10 embriones inyectados, al menos la mitad de los embriones vistos estarán en la etapa de desarrollo correcta, sin daños, y exhibirán un ASR robusto con estrés térmico a 32 °C. Este ASR será evidenciado por el montaje de varillas de actina intranuc...

Watch this Scientific Journal Video about Imaging Intranuclear Actin Rods in Live Heat Stressed Drosophila Embryos at JoVE.com

Imaging Intranuclear Actin Rods in Live Heat Stressed Drosophila Embryos

El objetivo de este protocolo es inyectar actina globular conjugada con rhodamina en embriones de Drosophila y el conjunto de barras de actina intranuclear de imagen después del estrés térmico.

Imágenes Intranuclear Actin Rods en vivo calor estresado Drosophila Embriones

The purpose of this protocol is to visualize intranuclear actin rods that assemble in live Drosophila melanogaster embryos following heat stress. Actin ...

imaging-intranuclear-actin-rods-live-heat-stressed-drosophila

Research

JoVE Journal

Developmental Biology

Imaging Intranuclear Actin Rods in Live Heat Stressed Drosophila Embryos

3.4K vistas.  Baylor College of Medicine. El objetivo de este protocolo es inyectar actina globular conjugada con rhodamina en embriones de Drosophila y el conjunto de barras de actina intranuclear de imagen después del estrés térmico.

Video: Imaging Intranuclear Actin Rods in Live Heat Stressed Drosophila Embryos

Live-imaging of the Drosophila Pupal Eye

Inherent processes of Drosophila pupal development can shift and distort the eye epithelium in ways that make individual cell behavior difficult to track during live cell imaging. These processes include: retinal rotation, cell growth and organismal movement. Additionally, irregularities in the topology of the epithelium, including subtle bumps and folds often introduced as the pupa is prepared for imaging, make it challenging to acquire in-focus images of more than a few ommatidia in a single focal plane. The workflow outlined here remedies these issues, allowing easy analysis of cellular processes during Drosophila pupal eye development. Appropriately-staged pupae are arranged in an imaging rig that can be easily assembled in most laboratories. Ubiquitin-DE-Cadherin:GFP and GMR-GAL4&#8211;driven UAS-&#945;-catenin:GFP are used to visualize cell boundaries in the eye epithelium 1-3. After deconvolution is applied to fluorescent images captured at multiple focal planes, maximum projection images are generated for each time point and enhanced using image editing software. Alignment algorithms are used to quickly stabilize superfluous motion, making individual cell behavior easier to track.

Live-imaging of the Drosophila Pupal Eye

This protocol presents an efficient method for imaging the live Drosophila pupal eye neuroepithelium. This method compensates for tissue movement and uneven topology, enhances visualization of cell boundaries through the use of multiple GFP-tagged junction proteins, and uses an easily-assembled imaging rig.

Live-proyección de imagen de la<em&gt; Drosophila</em&gt; Pupal Ojo

Inherent processes of Drosophila pupal development can shift and distort the eye epithelium in ways that make individual cell behavior difficult to track ...

Investigación

Biología del Desarrollo

Ploidy Manipulation of Zebrafish Embryos with Heat Shock 2 Treatment

Manipulation of ploidy allows for useful transformations, such as diploids to tetraploids, or haploids to diploids. In the zebrafish Danio rerio, specifically the generation of homozygous gynogenetic diploids is useful in genetic analysis because it allows the direct production of homozygotes from a single heterozygous mother. This article describes a modified protocol for ploidy duplication based on a heat pulse during the first cell cycle, Heat Shock 2 (HS2). Through inhibition of centriole duplication, this method results in a precise cell division stall during the second cell cycle. The precise one-cycle division stall, coupled to unaffected DNA duplication, results in whole genome duplication. Protocols associated with this method include egg and sperm collection, UV treatment of sperm, in vitro fertilization and heat pulse to cause a one-cell cycle division delay and ploidy duplication. A modified version of this protocol could be applied to induce ploidy changes in other animal species.

A modified protocol for ploidy manipulation uses a heat shock to induce a one-cycle stall in cytokinesis in the early embryo. This protocol is demonstrated in the zebrafish but may be applicable to other species.

La manipulación de ploidía de embriones de pez cebra con el Heat Shock Treatment 2

Manipulation of ploidy allows for useful transformations, such as diploids to tetraploids, or haploids to diploids. In the zebrafish Danio rerio, ...

Biosensing Motor Neuron Membrane Potential in Live Zebrafish Embryos

The protocols described here are designed to allow researchers to study cell communication without altering the integrity of the environment in which the cells are located. Specifically, they have been developed to analyze the electrical activity of excitable cells, such as spinal neurons. In such a scenario, it is crucial to preserve the integrity of the spinal cell, but it is also important to preserve the anatomy and physiological shape of the systems involved. Indeed, the comprehension of the manner in which the nervous system-and other complex systems-works must be based on a systemic approach. For this reason, the live zebrafish embryo was chosen as a model system, and the spinal neuron membrane voltage changes were evaluated without interfering with the physiological conditions of the embryos. 
Here, an approach combining the employment of zebrafish embryos with a FRET-based biosensor is described. Zebrafish embryos are characterized by a very simplified nervous system and are particularly suited for imaging applications thanks to their transparency, allowing for the employment of fluorescence-based voltage indicators at the plasma membrane during zebrafish development. The synergy between these two components makes it possible to analyze the electrical activity of the cells in intact living organisms, without perturbing the physiological state. Finally, this non-invasive approach can co-exist with other analyses (e.g., spontaneous movement recordings, as shown here).

Protocols described here allow for the study of the electrical properties of excitable cells in the most non-invasive physiological conditions by employing zebrafish embryos in an in vivo system together with a fluorescence resonance energy transfer (FRET)-based genetically encoded voltage indicator (GEVI) selectively expressed in the cell type of interest.

Potencial de membrana de la neurona motora de Biosensing en los embriones vivos de pez cebra

The protocols described here are designed to allow researchers to study cell communication without altering the integrity of the environment in which the ...

Long-term Live Imaging of Drosophila Eye Disc

Live imaging provides the ability to continuously track dynamic cellular and developmental processes in real time. Drosophila larval imaginal discs have been used to study many biological processes, such as cell proliferation, differentiation, growth, migration, apoptosis, competition, cell-cell signaling, and compartmental boundary formation. However, methods for the long-term ex vivo culture and live imaging of the imaginal discs have not been satisfactory, despite many efforts. Recently, we developed a method for the long-term ex vivo culture and live imaging of imaginal discs for up to 18 h. In addition to using a high insulin concentration in the culture medium, a low-melting agarose was also used to embed the disc to prevent it from drifting during the imaging period. This report uses the eye-antennal discs as an example. Photoreceptor R3/4-specific m&#948;0.5-Ga4 expression was followed to demonstrate that photoreceptor differentiation and ommatidial rotation can be observed during a 10 h live imaging period. This is a detailed protocol describing this simple method.

Long-term Live Imaging of Drosophila Eye Disc

This protocol describes a detailed method for the long-term ex vivo culture and live imaging of a Drosophila imaginal disc. It demonstrates photoreceptor differentiation and ommatidial rotation within the 10 h period of live imaging of the eye disc. The protocol is simple and does not require expensive setup.

A largo plazo de imágenes en vivo<em&gt; Drosophila</em&gt; Disco de ojos

Live imaging provides the ability to continuously track dynamic cellular and developmental processes in real time. Drosophila larval imaginal discs have ...

In Vitro Ovule Cultivation for Live-cell Imaging of Zygote Polarization and Embryo Patterning in Arabidopsis thaliana

In most flowering plants, the zygote and embryo are hidden deep in the mother tissue, and thus it has long been a mystery of how they develop dynamically; for example, how the zygote polarizes to establish the body axis and how the embryo specifies various cell fates during organ formation. This manuscript describes an in vitro ovule culture method to perform live-cell imaging of developing zygotes and embryos of Arabidopsis thaliana. The optimized cultivation medium allows zygotes or early embryos to grow into fertile plants. By combining it with a poly(dimethylsiloxane) (PDMS) micropillar array device, the ovule is held in the liquid medium in the same position. This fixation is crucial to observe the same ovule under a microscope for several days from the zygotic division to the late embryo stage. The resulting live-cell imaging can be used to monitor the real-time dynamics of zygote polarization, such as nuclear migration and cytoskeleton rearrangement, and also the cell division timing and cell fate specification during embryo patterning. Furthermore, this ovule cultivation system can be combined with inhibitor treatments to analyze the effects of various factors on embryo development, and with optical manipulations such as laser disruption to examine the role of cell-cell communication.

In Vitro Ovule Cultivation for Live-cell Imaging of Zygote Polarization and Embryo Patterning in Arabidopsis thaliana

This manuscript describes an in vitro ovule cultivation method that enables live-cell imaging of Arabidopsis zygotes and embryos. This method is utilized to visualize the intracellular dynamics during zygote polarization and the cell fate specification in developing embryos.

In Vitro Cultivo de óvulos para la proyección de imagen de cigoto polarización de Live-celular y patrones del embrión en Arabidopsis thaliana

In most flowering plants, the zygote and embryo are hidden deep in the mother tissue, and thus it has long been a mystery of how they develop dynamically; ...

Live Imaging of Mouse Secondary Palate Fusion

The fusion of the secondary palatal shelves to form the intact secondary palate is a key process in mammalian development and its disruption can lead to cleft secondary palate, a common congenital anomaly in humans. Secondary palate fusion has been extensively studied leading to several proposed cellular mechanisms that may mediate this process. However, these studies have been mostly performed on fixed embryonic tissues at progressive timepoints during development or in fixed explant cultures analyzed at static timepoints. Static analysis is limited for the analysis of dynamic morphogenetic processes such a palate fusion and what types of dynamic cellular behaviors mediate palatal fusion is incompletely understood. Here we describe a protocol for live imaging of ex vivo secondary palate fusion in mouse embryos. To examine cellular behaviors of palate fusion, epithelial-specific Keratin14-cre was used to label palate epithelial cells in ROSA26-mTmGflox reporter embryos. To visualize filamentous actin, Lifeact-mRFPruby reporter mice were used. Live imaging of secondary palate fusion was performed by dissecting recently-adhered secondary palatal shelves of embryonic day (E) 14.5 stage embryos and culturing in agarose-containing media on a glass bottom dish to enable imaging with an inverted confocal microscope. Using this method, we have detected a variety of novel cellular behaviors during secondary palate fusion. An appreciation of how distinct cell behaviors are coordinated in space and time greatly contributes to our understanding of this dynamic morphogenetic process. This protocol can be applied to mutant mouse lines, or cultures treated with pharmacological inhibitors to further advance understanding of how secondary palate fusion is controlled.

Here, we present a protocol for live imaging of mouse secondary palate fusion using confocal microscopy. This protocol can be used in combination with a variety of fluorescent reporter mouse lines, and with pathway inhibitors for mechanistic insight. This protocol can be adapted for live imaging in other developmental systems.

Imágenes en vivo de la fusión secundaria del paladar del ratón

The fusion of the secondary palatal shelves to form the intact secondary palate is a key process in mammalian development and its disruption can lead to ...

Live Imaging and Analysis of Muscle Contractions in Drosophila Embryo

Coordinated muscle contractions are a form of rhythmic behavior seen early during development in Drosophila embryos. Neuronal sensory feedback circuits are required to control this behavior. Failure to produce the rhythmic pattern of contractions can be indicative of neurological abnormalities. We previously found that defects in protein O-mannosylation, a posttranslational protein modification, affect the axon morphology of sensory neurons and result in abnormal coordinated muscle contractions in embryos. Here, we present a relatively simple method for recording and analyzing the pattern of peristaltic muscle contractions by live imaging of late stage embryos up to the point of hatching, which we used to characterize the muscle contraction phenotype of protein O-mannosyltransferase mutants. Data obtained from these recordings can be used to analyze muscle contraction waves, including frequency, direction of propagation and relative amplitude of muscle contractions at different body segments. We have also examined body posture and taken advantage of a fluorescent marker expressed specifically in muscles to accurately determine the position of the embryo midline. A similar approach can also be utilized to study various other behaviors during development, such as embryo rolling and hatching.

Live Imaging and Analysis of Muscle Contractions in Drosophila Embryo

Here, we present a method to record embryonic muscle contractions in Drosophila embryos in a non-invasive and detail-oriented manner.

Imagen en vivo y análisis de contracciones musculares en Drosophila Embryo

Coordinated muscle contractions are a form of rhythmic behavior seen early during development in Drosophila embryos. Neuronal sensory feedback circuits ...

Dissection and Live-Imaging of the Late Embryonic Drosophila Gonad

The Drosophila melanogaster male embryonic gonad is an advantageous model to study various aspects of developmental biology including, but not limited to, germ cell development, piRNA biology, and niche formation. Here, we present a dissection technique to live-image the gonad ex vivo during a period when in vivo live-imaging is highly ineffective. This protocol outlines how to transfer embryos to an imaging dish, choose appropriately-staged male embryos, and dissect the gonad from its surrounding tissue while still maintaining its structural integrity. Following dissection, gonads can be imaged using a confocal microscope to visualize dynamic cellular processes. The dissection procedure requires precise timing and dexterity, but we provide insight on how to prevent common mistakes and how to overcome these challenges. To our knowledge this is the first dissection protocol for the Drosophila embryonic gonad, and will permit live-imaging during an otherwise inaccessible window of time. This technique can be combined with pharmacological or cell-type specific transgenic manipulations to study any dynamic processes occurring within or between the&#160;cells in their natural gonadal environment.

Dissection and Live-Imaging of the Late Embryonic Drosophila Gonad

Here, we provide a dissection protocol required to live-image the late embryonic Drosophila male gonad. This protocol will permit observation of dynamic cellular processes under normal conditions or after transgenic or pharmacological manipulation.

Disección e imágenes en vivo de la Drosophila gonad embrionaria tardía

The Drosophila melanogaster male embryonic gonad is an advantageous model to study various aspects of developmental biology including, but not limited to, ...

Inhibición optogenética de la contractilidad de la actomiosina mediada por Rho1 en Drosophila

Optogenetic Inhibition of Rho1-Mediated Actomyosin Contractility Coupled with Measurement of Epithelial Tension in Drosophila Embryos

Contractile forces generated by actin and non-muscle myosin II ("actomyosin contractility") are critical for morphological changes of cells and tissues at multiple length scales, such as cell division, cell migration, epithelial folding, and branching morphogenesis. An in-depth understanding of the role of actomyosin contractility in morphogenesis requires approaches that allow the rapid inactivation of actomyosin, which is difficult to achieve using conventional genetic or pharmacological approaches. The presented protocol demonstrates the use of a CRY2-CIBN based optogenetic dimerization system, Opto-Rho1DN, to inhibit actomyosin contractility in Drosophila embryos with precise temporal and spatial controls. In this system, CRY2 is fused to the dominant negative form of Rho1 (Rho1DN), whereas CIBN is anchored to the plasma membrane. Blue light-mediated dimerization of CRY2 and CIBN results in rapid translocation of Rho1DN from the cytoplasm to the plasma membrane, where it inactivates actomyosin by inhibiting endogenous Rho1. In addition, this article presents a detailed protocol for coupling Opto-Rho1DN-mediated inactivation of actomyosin with laser ablation to investigate the role of actomyosin in generating epithelial tension during Drosophila ventral furrow formation. This protocol can be applied to many other morphological processes that involve actomyosin contractility in Drosophila embryos with minimal modifications. Overall, this optogenetic tool is a powerful approach to dissect the function of actomyosin contractility in controlling tissue mechanics during dynamic tissue remodeling.

Autor destacado: Inhibición optogenética de la contractilidad de la actomiosina mediada por Rho1 junto con la medición de la tensión epitelial en embriones de Drosophila  

Actomyosin contractility plays an important role in cell and tissue morphogenesis. However, it is challenging to manipulate actomyosin contractility in vivo acutely. This protocol describes an optogenetic system that rapidly inhibits Rho1-mediated actomyosin contractility in Drosophila embryos, revealing the immediate loss of epithelial tension after the inactivation of actomyosin in vivo.

Inhibición optogenética de la contractilidad de la actomiosina mediada por Rho1 junto con la medición de la tensión epitelial en embriones de Drosophila

Contractile forces generated by actin and non-muscle myosin II ("actomyosin contractility") are critical for morphological changes of cells and tissues at ...