Name: high-resolution optical mapping of the mouse sino-atrial node
Uploaded: 2016-12-02T11:30:00
Description: Watch this Scientific Journal Video about High-resolution Optical Mapping of the Mouse Sino-atrial Node at JoVE.com

We are supported by the University of Wisconsin-Madison Medical School start-up (A.V.G.).

Tutti gli esperimenti sono stati condotti in conformità con il National Institutes of Health Guide per la cura e l&#39;uso di animali da laboratorio (NIH Pub. No. 80-23). Tutti i metodi e protocolli utilizzati in questi studi sono stati approvati da The University of Wisconsin cura degli animali e Usa Comitato protocollo seguendo le Linee guida per la cura e l&#39;uso di animali da laboratorio pubblicati da NIH (pubblicazione n ° 85-23, revisionato 1996). Tutti gli animali utilizzati in questo studio hanno ricevuto la cura umana nel rispe...

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	<li>Efimov, I. R., Nikolski, V. P., Salama, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Optical+imaging+of+the+heart.">Optical imaging of the heart.</a> Circ Res. 95 (1), 21-33 (2004).</li><li>Herron, T. J., Lee, P., Jalife, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Optical+imaging+of+voltage+and+calcium+in+cardiac+cells+&amp;+tissues.">Optical imaging of voltage and calcium in cardiac cells &amp; tissues.</a> Circ Res. 110 (4), 609-623 (2012).</li><li>Fedorov, V. V., Glukhov, A. V., Chang, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Conduction+barriers+and+pathways+of+the+sino-atrial+pacemaker+complex:+their+role+in+normal+rhythm+and+atrial+arrhythmias.">Conduction barriers and pathways of the sino-atrial pacemaker complex: their role in normal rhythm and atrial arrhythmias.</a> Am J Physiol Heart Circ Physiol. , (2012).</li><li>Boyett, M. R., Honjo, H., Kodama, 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+sinoatrial+node,+a+heterogeneous+pacemaker+structure.">The sinoatrial node, a heterogeneous pacemaker structure.</a> Cardiovasc Res. 47 (4), 658-687 (2000).</li><li>Glukhov, A. V., 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=Sinoatrial+Node+Reentry+in+a+Canine+Chronic+Left+Ventricular+Infarct+Model:+The+Role+of+Intranodal+Fibrosis+and+Heterogeneity+of+Refractoriness.">Sinoatrial Node Reentry in a Canine Chronic Left Ventricular Infarct Model: The Role of Intranodal Fibrosis and Heterogeneity of Refractoriness.</a> Circ Arrhythm Electrophysiol. , (2013).</li><li>Glukhov, A. V., 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=Calsequestrin+2+deletion+causes+sinoatrial+node+dysfunction+and+atrial+arrhythmias+associated+with+altered+sarcoplasmic+reticulum+calcium+cycling+and+degenerative+fibrosis+within+the+mouse+atrial+pacemaker+complex.">Calsequestrin 2 deletion causes sinoatrial node dysfunction and atrial arrhythmias associated with altered sarcoplasmic reticulum calcium cycling and degenerative fibrosis within the mouse atrial pacemaker complex.</a> Eur Heart J. 36 (11), 686-697 (2015).</li><li>John, R. M., Kumar, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Sinus+Node+and+Atrial+Arrhythmias.">Sinus Node and Atrial Arrhythmias.</a> Circulation. 133 (19), 1892-1900 (2016).</li><li>Swaminathan, P. 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=Oxidized+CaMKII+causes+cardiac+sinus+node+dysfunction+in+mice.">Oxidized CaMKII causes cardiac sinus node dysfunction in mice.</a> J Clin Invest. 121 (8), 3277-3288 (2011).</li><li>Glukhov, A. V., Fedorov, V. V., Anderson, M. E., Mohler, P. J., Efimov, I. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Functional+anatomy+of+the+murine+sinus+node:+high-resolution+optical+mapping+of+ankyrin-B+heterozygous+mice.">Functional anatomy of the murine sinus node: high-resolution optical mapping of ankyrin-B heterozygous mice.</a> Am J Physiol Heart Circ Physiol. 299 (2), H482-H491 (2010).</li><li>Egom, E. 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=Impaired+sinoatrial+node+function+and+increased+susceptibility+to+atrial+fibrillation+in+mice+lacking+natriuretic+peptide+receptor+C.">Impaired sinoatrial node function and increased susceptibility to atrial fibrillation in mice lacking natriuretic peptide receptor C.</a> J Physiol. 593 (5), 1127-1146 (2015).</li><li>Torrente, A. G., 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=Burst+pacemaker+activity+of+the+sinoatrial+node+in+sodium-calcium+exchanger+knockout+mice.">Burst pacemaker activity of the sinoatrial node in sodium-calcium exchanger knockout mice.</a> Proc Natl Acad Sci U S A. 112 (31), 9769-9774 (2015).</li><li>Lang, D., Sulkin, M., Lou, Q., Efimov, I. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Optical+mapping+of+action+potentials+and+calcium+transients+in+the+mouse+heart.">Optical mapping of action potentials and calcium transients in the mouse heart.</a> J Vis Exp. (55), e3275 (2011).</li><li>Fedorov, V. V., 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=Application+of+blebbistatin+as+an+excitation-contraction+uncoupler+for+electrophysiologic+study+of+rat+and+rabbit+hearts.">Application of blebbistatin as an excitation-contraction uncoupler for electrophysiologic study of rat and rabbit hearts.</a> Heart Rhythm. 4 (5), 619-626 (2007).</li><li>Swift, L. 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=Properties+of+blebbistatin+for+cardiac+optical+mapping+and+other+imaging+applications.">Properties of blebbistatin for cardiac optical mapping and other imaging applications.</a> Pflugers Arch. 464 (5), 503-512 (2012).</li><li>Laughner, J. I., Ng, F. S., Sulkin, M. S., Arthur, R. M., Efimov, I. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Processing+and+analysis+of+cardiac+optical+mapping+data+obtained+with+potentiometric+dyes.">Processing and analysis of cardiac optical mapping data obtained with potentiometric dyes.</a> Am J Physiol Heart Circ Physiol. 303 (7), H753-H765 (2012).</li><li>Liu, J., Dobrzynski, H., Yanni, J., Boyett, M. R., Lei, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Organisation+of+the+mouse+sinoatrial+node:+structure+and+expression+of+HCN+channels.">Organisation of the mouse sinoatrial node: structure and expression of HCN channels.</a> Cardiovasc Res. 73 (4), 729-738 (2007).</li><li>Verheijck, E. 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=Electrophysiological+features+of+the+mouse+sinoatrial+node+in+relation+to+connexin+distribution.">Electrophysiological features of the mouse sinoatrial node in relation to connexin distribution.</a> Cardiovasc Res. 52 (1), 40-50 (2001).</li><li>Krishnaswamy, P. 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=Altered+parasympathetic+nervous+system+regulation+of+the+sinoatrial+node+in+Akita+diabetic+mice.">Altered parasympathetic nervous system regulation of the sinoatrial node in Akita diabetic mice.</a> J Mol Cell Cardiol. 82, 125-135 (2015).</li><li>Nygren, A., Lomax, A. E., Giles, W. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Heterogeneity+of+action+potential+durations+in+isolated+mouse+left+and+right+atria+recorded+using+voltage-sensitive+dye+mapping.">Heterogeneity of action potential durations in isolated mouse left and right atria recorded using voltage-sensitive dye mapping.</a> Am J Physiol Heart Circ Physiol. 287 (6), H2634-H2643 (2004).</li><li>Efimov, I. R., Fedorov, V. V., Joung, B., Lin, S. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mapping+cardiac+pacemaker+circuits:+methodological+puzzles+of+the+sinoatrial+node+optical+mapping.">Mapping cardiac pacemaker circuits: methodological puzzles of the sinoatrial node optical mapping.</a> Circ Res. 106 (2), 255-271 (2010).</li><li>Aschar-Sobbi, 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=Increased+atrial+arrhythmia+susceptibility+induced+by+intense+endurance+exercise+in+mice+requires+TNFalpha.">Increased atrial arrhythmia susceptibility induced by intense endurance exercise in mice requires TNFalpha.</a> Nat Commun. 6, 6018 (2015).</li><li>Hansen, B. J., 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=Atrial+fibrillation+driven+by+micro-anatomic+intramural+re-entry+revealed+by+simultaneous+sub-epicardial+and+sub-endocardial+optical+mapping+in+explanted+human+hearts.">Atrial fibrillation driven by micro-anatomic intramural re-entry revealed by simultaneous sub-epicardial and sub-endocardial optical mapping in explanted human hearts.</a> Eur Heart J. 36 (35), 2390-2401 (2015).</li><li>Lang, D., Petrov, V., Lou, Q., Osipov, G., Efimov, I. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Spatiotemporal+control+of+heart+rate+in+a+rabbit+heart.">Spatiotemporal control of heart rate in a rabbit heart.</a> J Electrocardiol. 44 (6), 626-634 (2011).</li><li>Kanlop, N., Sakai, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Optical+mapping+study+of+blebbistatin-induced+chaotic+electrical+activities+in+isolated+rat+atrium+preparations.">Optical mapping study of blebbistatin-induced chaotic electrical activities in isolated rat atrium preparations.</a> J Physiol Sci. 60 (2), 109-117 (2010).</li><li>Glukhov, A. V., Flagg, T. P., Fedorov, V. V., Efimov, I. R., Nichols, C. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Differential+K(ATP)+channel+pharmacology+in+intact+mouse+heart.">Differential K(ATP) channel pharmacology in intact mouse heart.</a> J Mol Cell Cardiol. 48 (1), 152-160 (2010).</li><li>Wu, J., 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=Altered+sinoatrial+node+function+and+intra-atrial+conduction+in+murine+gain-of-function+Scn5a+/DeltaKPQ+hearts+suggest+an+overlap+syndrome.">Altered sinoatrial node function and intra-atrial conduction in murine gain-of-function Scn5a+/DeltaKPQ hearts suggest an overlap syndrome.</a> Am J Physiol Heart Circ Physiol. 302 (7), H1510-H1523 (2012).</li></ol>

Qui, abbiamo presentato due tipi di preparazioni del mouse SAN: 1) intatto SAN nel cuore tutta la Langendorff-perfusione, e 2) SAN nella isolato, aperto preparazione atriale. Questi due tipi di elaborazione hanno diversi scopi sperimentali. Nella preparazione tutto il cuore Langendorff-perfuso, la struttura atriale intatta viene preservata che rende possibile studiare aritmie atriali complesse come la fibrillazione atriale e interazioni tra SAN e atrio durante le tachiaritmie rientranti. 6 Al contrario, nella...

Novel scientific breakthroughs that lead to leaps in the understanding of human physiology are often preceded by technological advances. Fluorescent optical mapping, for example, enables investigation of multiple physiological parameters in both cells and tissues.1,2 It significantly improved our understanding of how the anatomical structure is associated with electrophysiological functions and dysfunctions. In the heart, the natural pacemaker and conduction systems such as the sinoatrial node (SAN) and the atrioventricular junction consist of nodal myocytes that are insulated by the surrounding atrial myocytes.3-5 Such organization creates complex three-dimensional structures with specialized electrical properties. Both structural and functional remodeling of these pacemaker structures has been recognized to form significant electrophysiological heterogeneities.6,7 Understanding the mechanism underlying how such heterogeneities result in SAN dysfunctions and atrial arrhythmogenesis will dramatically benefit the clinical treatment of these diseases. It requires a technique to visualize the propagation of electrical signals at the tissue level, such as optical mapping. 
Recently, accumulating evidence has proven the advance of optical mapping in studies of atrial electrophysiology and pathology.2 However, novel and rigorous studies are dependent on the accurate interpretation of experimental data, whose validity and stability rely on careful experiment protocols. Genetically modified mice are extensively used for research as animal models of human diseases including sick sinus syndrome, pacemaker abnormalities and atrial arrhythmias.6,8-11 Thus, a combination of fluorescent optical mapping with transgenic mouse models provides a powerful tool to study cardiac electrical abnormalities associated with various pathologies. In this paper, we present a protocol for high-resolution optical mapping of the mouse SAN and atrium. Specifically, we discuss and compare different dye loading approaches, time effects on dye bleaching and heart rate stability during the experiment.

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high-resolution optical mapping of the mouse sino-atrial node

Sino-atrial node (SAN) dysfunctions and associated complications constitute important causes of morbidity in patients with cardiac diseases. The development of novel pharmacological therapies to cure these patients relies on the thorough understanding of both normal physiology and pathophysiology of the SAN. Among the studies of cardiac pacemaking, the mouse SAN is widely used due to its feasibility for modifications in the expression of different genes that encode SAN ion channels or calcium handling proteins. Emerging evidence from electrophysiological and histological studies has also proved the representativeness and similarity of the mouse SAN structure and functions to larger mammals, including the presence of specialized conduction pathways from the SAN to the atrium and a complex pacemakers' hierarchy within the SAN. Recently, the technique of optical mapping has greatly facilitated the exploration and investigation of the origin of excitation and conduction within and from the mouse SAN, which in turn has extended the understanding of the SAN and benefited clinical treatments of SAN dysfunction associated diseases. In this manuscript, we have described in detail how to perform the optical mapping of the mouse SAN from the intact, Langendorff-perfused heart and from the isolated atrial preparation. This protocol is a useful tool to enhance the understanding of mouse SAN physiology and pathophysiology.

Mappatura ottica del intatto SAN dal Cuore Langendorff-perfuso Un tipico esempio di una mappa di contorno di attivazione RA ricostruiti ritmo sinusale spontanea è mostrato in figura 3 per un cuore del mouse Langendorff-perfuso. Il punto di attivazione precoce si trova all&#39;interno della regione intercaval vicino alla SVC dove il SAN è anatomicamente definito. 3,16 mappe di contorno attivazione acquisite a 1.0 e 0.5 msec frequenza d...

Watch this Scientific Journal Video about High-resolution Optical Mapping of the Mouse Sino-atrial Node at JoVE.com

High-resolution Optical Mapping of the Mouse Sino-atrial Node

Qui, presentiamo un protocollo per la mappatura ottica di attività elettrica dal mouse atrio destro e soprattutto il nodo seno-atriale, con una risoluzione spaziale e temporale elevata.

Mappatura ottica ad alta risoluzione del mouse nodo seno-atriale

Sino-atrial node (SAN) dysfunctions and associated complications constitute important causes of morbidity in patients with cardiac diseases. The ...

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Optical mapping of the cardiac surface with voltage-sensitive fluorescent dyes has become an important tool to investigate electrical excitation in ...

Generation of Mice Derived from Induced Pluripotent Stem Cells

Generazione di topi derivati ​​da cellule staminali pluripotenti indotte

The production of induced pluripotent stem cells (iPSCs) from somatic cells provides a means to create valuable tools for basic research and may also ...

Using High Resolution Computed Tomography to Visualize the Three Dimensional Structure and Function of Plant Vasculature

Utilizzando ad alta risoluzione Tomografia Computerizzata Per visualizzare la struttura tridimensionale e funzione delle piante Vasculature

High resolution x-ray computed tomography (HRCT) is a non-destructive diagnostic imaging technique with sub-micron resolution capability that is now being ...

Voltage and Calcium Dual Channel Optical Mapping of Cultured HL-1 Atrial Myocyte Monolayer

Tensione e Calcio mappatura ottica a doppio canale di Colta HL-1 atriale miociti monostrato

Optical mapping has proven to be a valuable technique to detect cardiac electrical activity on both intact ex vivo hearts and in cultured myocyte ...

Optical Mapping of Intra-Sarcoplasmic Reticulum Ca2+ and Transmembrane Potential in the Langendorff-perfused Rabbit Heart

Optical Mapping of Intra-Sarcoplasmic Reticulum Ca2+ and Transmembrane Potential in the Langendorff-perfused Rabbit Heart

Mappatura ottica di Intra-reticolo sarcoplasmatico Ca<sup&gt; 2+</sup&gt; E transmembrana potenziale nel Rabbit Heart Langendorff-perfuso

Sarcoplasmic reticulum (SR) Ca2+ handling plays a key role in normal excitation-contraction coupling and aberrant SR Ca2+ handling is known to play a ...

High-resolution Time-lapse Imaging and Automated Analysis of Microtubule Dynamics in Living Human Umbilical Vein Endothelial Cells

Ad alta risoluzione Time-lapse imaging e analisi automatizzata dei microtubuli Dynamics in Living ombelicale umano cellule endoteliali Vena

The physiological process by which new vasculature forms from existing vasculature requires specific signaling events that trigger morphological changes ...