Name: measuring fast calcium fluxes in cardiomyocytes
Uploaded: 2011-11-29T13:00:00
Description: Watch this Scientific Journal Video about Measuring Fast Calcium Fluxes in Cardiomyocytes at JoVE.com

यह काम राष्ट्रीय स्वास्थ्य अनुदान GM53132 2R01 और GM071558 P50 के संस्थान के द्वारा समर्थित किया गया.

1. कैल्शियम संकेतक के साथ लोड हो रहा है कोशिकाओं <ol><li> प्लेट 35 मिमी गिलास नीचे MatTek बर्तन में कोशिकाओं (या किसी भी अन्य गिलास नीचे कक्षों को देखने). </li><li> 10μg/ml laminin के साथ पहले प्राथमिक myocytes कोट कक्षों 1 दिन का उपयोग क...

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	<li>Cheng, H., Lederer, M. R., Lederer, W. J., Cannell, M. B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Calcium+sparks+and+[Ca2+]i+waves+in+cardiac+myocytes.">Calcium sparks and [Ca2+]i waves in cardiac myocytes.</a> Am. J. Physiol. Cell. Physiol. 270, 148-159 (1996).</li><li>Cheng, H., Lederer, W. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Calcium+Sparks.">Calcium Sparks.</a> Physiol. Rev. 88, 1491-1545 (2008).</li><li>Rebecchi, M. J., Pentyala, S. N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Structure,+function,+and+control+of+phosphoinositide-specific+phospholipase.">Structure, function, and control of phosphoinositide-specific phospholipase.</a> C. Physiol.Rev. 80, 1291-1335 (2000).</li><li>Suh, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Multiple+roles+of+phosphoinositide-specific+phospholipase+C+isozymes.">Multiple roles of phosphoinositide-specific phospholipase C isozymes.</a> BMB reports. 41, 415-434 (2008).</li><li>Schlegel, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Crowded+little+caves:+structure+and+function+of+caveolae.">Crowded little caves: structure and function of caveolae.</a> Cell. Signal. 10, 457-463 (1998).</li><li>Anderson, R. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+caveolae+membrane+system.">The caveolae membrane system.</a> Annu. Rev. Biochem. 67, 199-225 (1998).</li><li>Sengupta, P., Philip, F., Scarlata, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Caveolin-1+alters+Ca2++signal+duration+through+specific+interaction+with+the+G{alpha}q+family+of+G+proteins.">Caveolin-1 alters Ca2+ signal duration through specific interaction with the G{alpha}q family of G proteins.</a> J. Cell. Sci. 121, 1363-1372 (2008).</li><li>Guo, Y., Golebiewska, U., Scarlata, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Modulation+of+Ca2++Activity+in+Cardiomyocytes+through+Caveolae-G[alpha]q+Interactions.">Modulation of Ca2+ Activity in Cardiomyocytes through Caveolae-G[alpha]q Interactions.</a> Biophysical. Journal. 100, 1599-1607 (1016).</li><li>Rybin, V. O., Xu, X., Lisanti, M. P., Steinberg, 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=Differential+targeting+of+beta+-adrenergic+receptor+subtypes+and+adenylyl+cyclase+to+cardiomyocyte+caveolae.+A+mechanism+to+functionally+regulate+the+cAMP+signaling+pathway.">Differential targeting of beta -adrenergic receptor subtypes and adenylyl cyclase to cardiomyocyte caveolae. A mechanism to functionally regulate the cAMP signaling pathway.</a> J. Biol. Chem. 275, 41447-41457 (2000).</li><li>Tovey, S. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Calcium+puffs+are+generic+InsP3-activated+elementary+calcium+signals+and+are+downregulated+by+prolonged+hormonal+stimulation+to+inhibit+cellular+calcium+responses.">Calcium puffs are generic InsP3-activated elementary calcium signals and are downregulated by prolonged hormonal stimulation to inhibit cellular calcium responses.</a> J. Cell. Sci. 114, 3979-3989 (2001).</li><li>Lohn, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ignition+of+Calcium+Sparks+in+Arterial+and+Cardiac+Muscle+Through+Caveolae.">Ignition of Calcium Sparks in Arterial and Cardiac Muscle Through Caveolae.</a> Circ. Res. 87, 1034-1039 (2000).</li></ol>

हम एक को देखने और रहने वाले cardiomyocytes में तेजी से कैल्शियम संकेतों को अलग विधि विकसित की है. जबकि इन मापों के प्रयोगात्मक शर्तों अन्य सेल 10 प्रणाली के रूप में के रूप में अच्छी तरह से 11 cardiomyocytes पहले लागू ?...

<table border="1"><tbody><tr><td> अभिकर्मक के नाम </td><td> कंपनी </td><td> सूचीपत्र संख्या </td><td> टिप्पणियाँ </td></tr><tr><td> DMEM </td><td> Invitrogen </td><td> ABCD1234 </td><td></td></tr></tbody></table>

measuring fast calcium fluxes in cardiomyocytes

Cardiomyocytes have multiple Ca2+ fluxes of varying duration that work together to optimize function 1,2. Changes in Ca2+ activity in response to extracellular agents is predominantly regulated by the phospholipase C&beta;- G&alpha;q pathway localized on the plasma membrane which is stimulated by agents such as acetylcholine 3,4. We have recently found that plasma membrane protein domains called caveolae5,6 can entrap activated G&alpha;q 7. This entrapment has the effect of stabilizing the activated state of G&alpha;q and resulting in prolonged Ca2+ signals in cardiomyocytes and other cell types8. We uncovered this surprising result by measuring dynamic calcium responses on a fast scale in living cardiomyocytes. Briefly, cells are loaded with a fluorescent Ca2+ indicator. In our studies, we used Ca2+ Green (Invitrogen, Inc.) which exhibits an increase in fluorescence emission intensity upon binding of calcium ions. The fluorescence intensity is then recorded for using a line-scan mode of a laser scanning confocal microscope. This method allows rapid acquisition of the time course of fluorescence intensity in pixels along a selected line, producing several hundreds of time traces on the microsecond time scale. These very fast traces are transferred into excel and then into Sigmaplot for analysis, and are compared to traces obtained for electronic noise, free dye, and other controls. To dissect Ca2+ responses of different flux rates, we performed a histogram analysis that binned pixel intensities with time. Binning allows us to group over 500 traces of scans and visualize the compiled results spatially and temporally on a single plot. Thus, the slow Ca2+ waves that are difficult to discern when the scans are overlaid due to different peak placement and noise, can be readily seen in the binned histograms. Very fast fluxes in the time scale of the measurement show a narrow distribution of intensities in the very short time bins whereas longer Ca2+ waves show binned data with a broad distribution over longer time bins. These different time distributions allow us to dissect the timing of Ca2+fluxes in the cells, and to determine their impact on various cellular events.

Watch this Scientific Journal Video about Measuring Fast Calcium Fluxes in Cardiomyocytes at JoVE.com

Measuring Fast Calcium Fluxes in Cardiomyocytes

हम रहने वाले confocal माइक्रोस्कोपी स्कैनिंग लेसर का उपयोग कर कोशिकाओं में धीमी अपशिष्टों से तेजी microsecond () कैल्शियम की घटनाओं को अलग करने की विधि प्रस्तुत करते हैं. विधि एक सेल में कई सौ पिक्सल के रिकॉर्डिंग लाइन स्कैन द्वारा कैल्शियम संकेतकों के प्रतिदीप्ति तीव्रता उतार चढ़ाव के उपाय. हिस्टोग्राम विश्लेषण हमें अलग कैल्शियम अपशिष्टों के समय तराजू अलग करने के लिए अनुमति देता है.

Cardiomyocytes में फास्ट कैल्शियम अपशिष्टों को मापने

Cardiomyocytes have multiple Ca2+ fluxes of varying duration that work together to optimize function 1,2. Changes in Ca2+ activity in response to ...

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