Yazarlar teknik yardım için Jose Luis De la Vega, Erika Melchy ve Dr Takuya Nishigaki teşekkür ederim. Dirección General de asuntos del Kişisel Académico / Universidad Nacional Autonoma de México (CT IN202212-3); Bu çalışma Consejo Nacional de Ciencia y Tecnología (CONACyT-Meksika) (BT için 99.333 ve 128.566) tarafından desteklenmiştir.

<ol>
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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=Pharmacological+targeting+of+native+CatSper+channels+reveals+a+required+role+in+maintenance+of+sperm+hyperactivation.">Pharmacological targeting of native CatSper channels reveals a required role in maintenance of sperm hyperactivation.</a> PLoS ONE. 4, e6844 (2009).</li><li>Brokaw, C. 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+and+flagellar+response+during+the+chemotaxis+of+bracken+spermatozoids.">Calcium and flagellar response during the chemotaxis of bracken spermatozoids.</a> J. Cell. Physiol. 83, 151-158 (1974).</li><li>Visconti, P. 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=Capacitation+of+mouse+spermatozoa.+II.+Protein+tyrosine+phosphorylation+and+capacitation+are+regulated+by+a+cAMP-dependent+pathway.">Capacitation of mouse spermatozoa. II. Protein tyrosine phosphorylation and capacitation are regulated by a cAMP-dependent pathway.</a> Development. 121, 1139-1150 (1995).</li><li>Svahn, H. A., van den Berg, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Single+cells+or+large+populations.">Single cells or large populations.</a> Lab on a chip. 7, 544-546 (2007).</li><li>Pepperkok, R., Ellenberg, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=High-throughput+fluorescence+microscopy+for+systems+biology.">High-throughput fluorescence microscopy for systems biology.</a> Nat. Rev. Mol. Cell Biol. 7, 690-696 (2006).</li><li>Strunker, 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=The+CatSper+channel+mediates+progesterone-induced+Ca2++influx+in+human+sperm.">The CatSper channel mediates progesterone-induced Ca2+ influx in human sperm.</a> Nature. 471, 382-386 (2011).</li><li>Lishko, 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=The+Control+of+Male+Fertility+by+Spermatozoan+Ion+Channels.">The Control of Male Fertility by Spermatozoan Ion Channels.</a> Annu. Rev. Physiol. , (2011).</li><li>Kao, J. P., Harootunian, A. T., Tsien, R. Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Photochemically+generated+cytosolic+calcium+pulses+and+their+detection+by+fluo-3.">Photochemically generated cytosolic calcium pulses and their detection by fluo-3.</a> J. Biol. Chem. 264, 8179-8184 (1989).</li><li>Kilic, F., 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=Caged+progesterone:+a+new+tool+for+studying+rapid+nongenomic+actions+of+progesterone.">Caged progesterone: a new tool for studying rapid nongenomic actions of progesterone.</a> Journal of the American Chemical Society. 131, 4027-4030 (2009).</li><li>Lishko, P. V., Botchkina, I. L., Kirichok, Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Progesterone+activates+the+principal+Ca2++channel+of+human+sperm.">Progesterone activates the principal Ca2+ channel of human sperm.</a> Nature. 471, 387-391 (2011).</li><li>Xia, J., Ren, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+BSA-induced+Ca2++influx+during+sperm+capacitation+is+CATSPER+channel-dependent.">The BSA-induced Ca2+ influx during sperm capacitation is CATSPER channel-dependent.</a> Reprod. Biol. Endocrinol. 7, 119 (2009).</li><li>Galantino-Homer, H. L., Florman, H. M., Storey, B. T., Dobrinski, I., Kopf, G. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Bovine+sperm+capacitation:+assessment+of+phosphodiesterase+activity+and+intracellular+alkalinization+on+capacitation-associated+protein+tyrosine+phosphorylation.">Bovine sperm capacitation: assessment of phosphodiesterase activity and intracellular alkalinization on capacitation-associated protein tyrosine phosphorylation.</a> Mol. Reprod. Dev. 67, 487-500 (2004).</li><li>Baldi, 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=Intracellular+calcium+accumulation+and+responsiveness+to+progesterone+in+capacitating+human+spermatozoa.">Intracellular calcium accumulation and responsiveness to progesterone in capacitating human spermatozoa.</a> J. Androl. 12, 323-330 (1991).</li></ol>

Biz ifşa hiçbir şey yok.

Hücre içi sinyal en hücresel faaliyetleri için hayati önem taşımaktadır, Ca 2 + yaşam döngüsünün sonuna kadar, gübreleme kendi kökenli, onların bütün ömrü boyunca memeli hücrelerinde eşlik her yerde bulunan bir elçisidir. Farklı uyaranlara yanıt olarak, [Ca 2 +] i artar, salınır ve uzay-zamansal kodlama ile azalır, buna göre, çeşitli süreçler aktive, modüle veya Ca 2 +-kodlanmış mesajları ile sonlandırıldı. Hücre içi Ca2 + iyon Bu siny...

Ca 2 + ökaryotik hücrelerde sinyal iletim yollarının evrensel bir ikinci elçisidir. Hücre içi Ca 2 + (Ca 2 + i) heyecanlı ve olmayan heyecanlı hem hücrelerinde birçok temel fizyolojik süreçlerin düzenlenmesinde katılır. Ca 2 önemi ve evrenselliği + ikinci haberci olarak sinyal iletimi olaylar sırasında hücre içinde bilgi iletimi kendi uzay-zamansal çok yönlülük türetilmiştir. Ca 2 + de novo veya hücre, onun hücre içi konsantrasyonu ([Ca 2 +] i) içinde bozulmuş sentez edilemez farklı hücresel sürekli tampon, Sequester, bölümlere bu mekanizmaları ve / yoluyla çok sıkı sınırlar içinde tutulan veya Ca 2 birikir iken +. Bu iyon konsantrasyonu değişiklikler hücre 1 içinde son derece lokalize bölgelerde ortaya çıkar ve bu dalgalanmalar deşifre bir de kazanmak için gereklidir olabilirsinyal mekanizması (1) rolleri, (2), fizyolojik önemi, hücre sinyal iletimi ve (3) genel mekanizmaları eper anlaşılması. Ca2 +-aracılı sinyal sperm fizyolojisi 2&#39;de özel bir önem taşımaktadır. Sperm hareketliliği döllenme başarı için en önemli işlevlerinden biridir ve aslında, birkaç sperm hareketliliğini kusurları kısırlığa 3-5 neden olabilir. + Flagellar hareket Ca 2 önemi uzun 6 kabul edilmiştir, ancak, Ca 2 + flagellar bükme, belirli bir formu nasıl kontrol mekanizması tam olarak anlaşılamamıştır. Yumurta eritme önce, sperm kapasitasyonu, kadın sistemi içinde sperm ikamet bağımlı karmaşık bir süreç geçmesi gerekir. Kapasitasyonu sırasında sperm membranın lipid mimarisi ve organizasyonu esas olarak plazma zarının kolesterol çıkarılmasının bir sonucu olarak, modifiye edilmiştir. Buna ek olarak, birçok protein tirozin-fosfor vardır7 ylated. Önemli olarak, kapasitasyonu sırasında hücre içi pH&#39;ın artmasına (pH i) ve [Ca2 +] i, ve membran potansiyeli bazı türler 2 hiperpolarizasyona. Kapasitasyonu sadece sperm (% 20-40) bir alt grubunda yer alır ve tüm bu hücresel değişiklikler yer alan mekanizma tam olarak uzaktır. Genellikle fizyolojik bobin maruz kaldığında kapasitan sperm sadece bir alt akrozom reaksiyonu (AR) tabi olduğu kabul edilmektedir. AR da (dış ve iç zarları ile özel organel) bir akrozom sahip tüm türlerde döllenme için gerekli bir Ca 2 +-düzenlenmiş bir olaydır. Bu işlem sırasında spermin plazma zarı ile dış akrozomal membran sigortalar, sperm hücresi yumurta (zona pellucida veya ZP) çevreleyen gliko-protein matris nüfuz izin hidrolitik enzimler serbest. AR da etkileşim yeni füzyojenik sperm hücresi yüzey ortayaHer iki gamet son füzyon için yumurta plazma zarı. AR, progesteron en aralarında çalışılan biri olmak neden çeşitli hücresel ligandlar vardır. Bu çalışmada biz ölçmek için bir Ca 2 + duyarlı floresan boya kullanımını içeren dört farklı tekniklerini [Ca 2 +] i progesteron tetiklediği insan sperm değişiklikler (biz [Ca 2 ölçülen hangi akım sitometri hariç + ] i) in vitro kapasitasyonu sürecinde sırasında neden artar. Bu özel durumda biz kullanılan Fluo-3 AM (Life Technologies, Grand Island, NY), bir membran geçirgen bir boya Kd = 325 nM. In vitro metodolojiler biz üç ile zamanın bir fonksiyonu olarak izlenir floresan değişiklikler, ve dördüncü tekniği ile zaman içinde tek bir noktada floresan değerleri ölçülmüştür. Tamamen onlar mekansal ve zamansal res sağlarlar bu farklı yaklaşımlar, birbirini tamamlayıcıtek hücre ve hücre nüfus düzeyleri hem de olution. Hücre Nüfus veya Toplu Deneyler Onlar iyi kurulmuş, basit ve tek bir deneyde hücre milyonlarca üzerinde yapılan ölçümlerden bilgilerin ortalama için izin çünkü ihtiyaç duydukları araçları da hazır, ancak çünkü toplu teknikleri yaygın olarak sadece kullanılır. Teknik 1.. Geleneksel Florometre Bu teknik, bir zaman fonksiyonu olarak floresans değişiklikleri izler; deneyler 200 ile 1,000 arasında değişen ul numune hacmi ile cam küvet içinde gerçekleştirilir. Ilave reaktiflerin uygun karıştırma Manyetik bir karıştırma gerektirir ve bu nedenle elde edilen zamansal çözünürlüğü saniye seviyesindedir. Analiz edilen örnekler arasında tipik bir hücre konsantrasyon aralığı, 10 5 8 -10 hücre / ml &#39;dir. Teknik 2.. Durduruldu Akış Florometre Ttekniğini de zamanın bir fonksiyonu olarak floresans değişiklikleri izler, ancak reaktifler hızlı bir şekilde çok küçük bir numune hacmi (25-100 ul kadar) ihtiva eden bir kaydın küvet içinde (basınç kullanarak) birlikte karıştırılır. Bu nedenle, reaktif homojenizasyon milisaniye için yüksek temporal çözünürlük sağlayan, anlıktır. Ortaya çıkan floresan karşı zaman izleri analizi analiz örneklerin ortak bir hücre konsantrasyonu aralığı kısa süreli bir tepkime ara maddeler, vs hakkında bilgi elde edilmesi, reaksiyon mekanizması karmaşıklığı açıklık, tepkime hızını belirlemek için uygun olan 10 5 -10 7 hücre / ml. Tek Hücre Deneyler Toplu deneyler hücrelerin büyük bir sayısının ortalama davranışı rapor, ancak, bir popülasyon sıklıkla bu tip ölçümler sırasında göz ardı edilir heterojen özellikler sergileyebilirler. Tek hücre teknikleri böylece inci tamamlamak için kullanılıre bilgi hücre popülasyonu deneylerle elde. Teknik 3.. Sitometrisi Tek bir hücre ölçümlerinin kaynaklanan bilgiyi önemine rağmen, bütün bir nüfus hücreye spesifik özelliklerinin hatalı ekstrapolasyon önlemek amacıyla hücreleri, çok sayıda analiz etmek önemlidir. Bu nedenle, yüksek verimli teknikleri tercih edilmektedir ve en popüler yöntem durumda 10.000 hücreleri geleneksel olarak analiz edildiği, akım sitometri olduğunu. Onların boyutu (ileri dağılım (FSC)), boyu (yan dağılım (SSC)) ve floresan yoğunluğu (bir antikor ile özel etiketleme, canlılığı işaretleyici, vb) göre hücreleri sınıflandırır Bu yöntem heterojen nüfus çok-parametrik analiz sağlar , böylece bir hücre grubu için parametreleri &#39;dağıtım hakkında bilgi veren. Flow sitometri oldukça zaman bağımlı bilgi 8&#39;den anlık sağlar. Ileri ve yan dağılım değerleri arhücreleri içerir, ancak floresan ölçümleri, negatif ve pozitif floresan kontroller için hücresel enkaz, toz, vb ayrımcılık bir kapı seçmek için de yararlıdır e de dahil edilmelidir. Birden fazla flüoresan kanalı kullanıldığında, dengeleme olarak bilinen bir işlem (ayrıntılar için bkz gerçekleştirilmelidir <a href="http://www.bdbiosciences.com/resources/protocols/setting_compensation.jsp" target="_blank">http://www.bdbiosciences.com/resources/protocols/setting_compensation.jsp</a> ). Tazminat fluorophores arasında spektral örtüşme ayrımcılık sağlar. Akış sitometri de propidyum iyodür boyaması yolu ile, genellikle, ölü hücreler arasında ayrım sağlar. Teknik 4.. Tek Hücre Görüntüleme Mikroskopi tek hücre davranışlarını incelemek için başka bir yaygın yöntem değil, iyi zamana bağlı çalışmaları için uygun ve aynı zamanda uzaysal çözünürlüğü sağlar. Bir büyük dezavantajı yüksek verimlilik analizi şu anda emekleme döneminde sadece olmasıdır <s9&gt; kadar.

<table border="1">
 <tbody>
 <tr>
 <td>Name of Reagent/Material</td>
 <td>Company</td>
 <td>Catalog Number</td>
 <td>Comments</td>
 </tr>
 <tr>
 <td>Ham's F-10</td>
 <td>Sigma-Aldrich</td>
 <td>N-6013</td>
 <td></td>
 </tr>
 <tr>
 <td>Bovine Serum Albumin</td>
 <td>Sigma-Aldrich</td>
 <td>A-7906</td>
 <td></td>
 </tr>
 <tr>
 <td>Calcium Chloride Dihydrate approx. 99%</td>
 <td>Sigma-Aldrich</td>
 <td>C-3881</td>
 <td></td>
 </tr>
 <tr>
 <td>Makler Counting Chamber</td>
 <td>SEFI Medical Insruments LTD</td>
 <td>SEF-MAKL</td>
 <td></td>
 </tr>
 <tr>
 <td>Fluo-3 AM</td>
 <td>Invitrogen</td>
 <td>F-1242</td>
 <td>20 vials/50 &mu;g each</td>
 </tr>
 <tr>
 <td>Ionomycin</td>
 <td>Alomone</td>
 <td>I-700</td>
 <td></td>
 </tr>
 <tr>
 <td>Progesterone</td>
 <td>Sigma-Aldrich</td>
 <td>P0130</td>
 <td></td>
 </tr>
 <tr>
 <td>Sodium chloride</td>
 <td>Sigma-Aldrich</td>
 <td>S-9888</td>
 <td>Reagents for human sperm medium (HSM)</td>
 </tr>
 <tr>
 <td>Potassium chloride</td>
 <td>Sigma-Aldrich</td>
 <td>P-3911</td>
 <td>Reagents for human sperm medium (HSM)</td>
 </tr>
 <tr>
 <td>Sodium bicarbonate</td>
 <td>JT Baker</td>
 <td>3506</td>
 <td>Reagents for human sperm medium (HSM)</td>
 </tr>
 <tr>
 <td>Magnesium chloride</td>
 <td>Sigma-Aldrich</td>
 <td>M-2670</td>
 <td>Reagents for human sperm medium (HSM)</td>
 </tr>
 <tr>
 <td>Calcium chloride anhydrous</td>
 <td>Sigma-Aldrich</td>
 <td>C-1016</td>
 <td>Reagents for human sperm medium (HSM)</td>
 </tr>
 <tr>
 <td>HEPES</td>
 <td>Sigma-Aldrich</td>
 <td>H-3125</td>
 <td>Reagents for human sperm medium (HSM)</td>
 </tr>
 <tr>
 <td>D-Glucose</td>
 <td>JT Baker</td>
 <td>1906-01</td>
 <td>Reagents for human sperm medium (HSM)</td>
 </tr>
 <tr>
 <td>Sodium pyruvate</td>
 <td>Sigma-Aldrich</td>
 <td>P-2256</td>
 <td>Reagents for human sperm medium (HSM)</td>
 </tr>
 <tr>
 <td>Sodium L-lactate (aprox. 99%)</td>
 <td>Sigma-Aldrich</td>
 <td>L- 7022</td>
 <td>Reagents for human sperm medium (HSM)</td>
 </tr>
 <tr>
 <td>Propidium Iodide </td>
 <td>Invitrogen</td>
 <td>L-7011 </td>
 <td>Component B</td>
 </tr>
 <tr>
 <td>Triton X-100 (t-Octylphenoxypolyethoxyethanol)</td>
 <td>Sigma- Aldrich</td>
 <td>X-100</td>
 <td>2.4 mM solution in water </td>
 </tr>
 <tr>
 <td>Round coverslip </td>
 <td>VWR</td>
 <td>48380 080</td>
 <td>25 mm diameter</td>
 </tr>
 <tr>
 <td>Poly-L-lysine solution </td>
 <td>Sigma-Aldrich</td>
 <td>P8920</td>
 <td></td>
 </tr>
 <tr>
 <td>Manganese chloride</td>
 <td>Sigma-Aldrich</td>
 <td>M-3634</td>
 <td></td>
 </tr>
 <tr>
 <td>Attofluor; Cell Chamber, for microscopy</td>
 <td>Life technologies</td>
 <td>A-7816</td>
 <td></td>
 </tr>
 <tr>
 <td>Dimethyl Sulphoxide</td>
 <td>Sigma-Aldrich</td>
 <td>D2650</td>
 <td>5x5 ml</td>
 </tr>
 </tbody>
</table>

measuring intracellular ca2+ changes in human sperm using four techniques: conventional fluorometry, stopped flow fluorometry, flow cytometry and single cell imaging

Sperm, özellikle ulaşmak tanımak ve yumurta ile kaynaştırmak için tasarlanmış erkek üreme hücreleridir. Bu görevleri gerçekleştirmek için, sperm hücreleri sürekli değişen bir ortamda yüz ve birkaç fiziksel engelleri aşmak için hazır olmalıdır. Transkripsiyonel ve translationally sessiz özünde olan bu hareketli hücreler kendilerini yönlendirmek için çeşitli sinyal mekanizmaları derinden güveniyor ve yönlendirilmiş bir şekilde yüzmek ve yumurta bulmak için yolculuk sırasında çevre koşulları zorlu mücadele etmek. Özellikle, Ca 2 +-aracılı sinyal birkaç sperm fonksiyonları için çok önemlidir: motilite, kapasitasyonu (akrozom reaksiyonu için sperm hazırlayan karmaşık bir süreç) ve akrozom reaksiyonu (sperm-yumurta füzyon sağlayan bir eksositotik olay) aktivasyonu. Bu iyonun, hücre içi dalgalanmaları izlemek için flüoresan boyaların kullanım uygulaması duyarlılık kolaylığı nedeniyle önem arzetmektedir ve det yönlülükection. Tek boya yükleme protokolü kullanarak biz sperm Ca 2 + dinamikleri izlemek için dört farklı florometrik teknikleri kullanmaktadır. Her teknik hem tek bir hücre ve hücre popülasyonu düzeyde veri üreten, mekansal ve / veya zamansal çözünürlük sağlayan farklı bilgi sağlar.

<img alt="Şekil 1" fo:content-width="6in" fo:src="/files/ftp_upload/50344/50344fig1highres.jpg" src="/files/ftp_upload/50344/50344fig1.jpg" /> 1 Şekil. Havuz yöntemi ile sperm örneği hazırlanması için deney protokolünde. Hareketli sperm ayrılması için ve konsantrasyon ayarı için önemli adımlar şematik diyagramı gösterilmiştir. Kapasitasyonu gerekli olduğu zaman, son adım yalnızca inkübasyon gerçekleştirilir. <p cla...

Watch this Scientific Journal Video about Measuring Intracellular Ca2+ Changes in Human Sperm using Four Techniques: Conventional Fluorometry, Stopped Flow Fluorometry, Flow Cytometry and Single Cell 

Measuring Intracellular Ca2+ Changes in Human Sperm using Four Techniques: Conventional Fluorometry, Stopped Flow Fluorometry, Flow Cytometry and Single Cell Imaging

Hücre içi Ca<sup&gt; 2 +</sup&gt; Dinamikleri Sperm fizyolojisi ve Ca çok önemlidir<sup&gt; 2 +</sup&gt; Duyarlı floresan boyalar onları incelemek için çok yönlü bir araç oluşturmaktadır. Nüfus deneyleri (fluorometri ve akış fluorometri durdu) ve tek bir hücre deneyleri (akım sitometri ve tek hücre görüntüleme) uzay-zamansal [Ca izlemek için kullanılır<sup&gt; 2 +</supInsan sperm hücrelerinde&gt;] değişir.

Hücre içi Ca Ölçme<sup&gt; 2 +</supDört Teknikleri ile İnsan rm&gt; Değişiklikler: Konvansiyonel Florometre, Akış Florometre, Sitometrisi ve Tek Hücre Görüntüleme Durduruldu

Spermatozoa  are male reproductive cells especially designed to reach, recognize and fuse  with the egg. To perform these tasks, sperm cells must be ...

measuring-intracellular-ca2-changes-human-sperm-using-four-techniques

Research

JoVE Journal

Biology

Measuring Intracellular Ca2+ Changes in Human Sperm using Four Techniques: Conventional Fluorometry, Stopped Flow Fluorometry, Flow Cytometry and Single Cell Imaging

20.2K Görüntüleme.  Instituto de Biotecnología-Universidad Nacional Autónoma de México. Hücre içi Ca 2 + Dinamikleri Sperm fizyolojisi ve Ca çok önemlidir 2 + Duyarlı floresan boyalar onları incelemek için çok yönlü bir araç oluşturmaktadır. Nüfus deneyleri (fluorometri ve akış fluorometri durdu) ve tek bir hücre deneyleri (akım sitometri ve tek hücre görüntüleme) uzay-zamansal [Ca izlemek için kullanılır 2 +] değişir.

Video: Measuring Intracellular Ca2+ Changes in Human Sperm using Four Techniques: Conventional Fluorometry, Stopped Flow Fluorometry, Flow Cytometry and Single Cell Imaging

Techniques for Imaging Ca2+ Signaling in Human Sperm

Fluorescence microscopy of cells loaded with fluorescent, Ca2+-sensitive dyes is used for measurement of spatial and temporal aspects of Ca2+ signaling in live cells. Here we describe the method used in our laboratories for loading suspensions of human sperm with Ca2+-reporting dyes and measuring the fluorescence signal during physiological stimulation. Motile cells are isolated by direct swim-up and incubated under capacitating conditions for 0-24 h, depending upon the experiment. The cell-permeant AM (acetoxy methyl ester) ester form of the Ca2+-reporting dye is then added to a cell aliquot and a period of 1 h is allowed for loading of the dye into the cytoplasm. We use visible wavelength dyes to minimize photo-damage to the cells, but this means that ratiometric recording is not possible. Advantages and disadvantages of this approach are discussed. During the loading period cells are introduced into an imaging chamber and allowed to adhere to a poly-D-lysine coated coverslip. At the end of the loading period excess dye and loose cells are removed by connection of the chamber to the perfusion apparatus. The chamber is perfused continuously, stimuli and modified salines are then added to the perfusion header. Experiments are recorded by time-lapse acquisition of fluorescence images and analyzed in detail offline, by manually drawing regions of interest. Data are normalized to pre-stimulus levels such that, for each cell (or part of a cell), a graph showing the Ca2+ response as % change in fluorescence is obtained.

Techniques for Imaging Ca2+ Signaling in Human Sperm

Stimulus-evoked [Ca2+]i signals of individual human sperm are assessed. Motile cells are loaded with Ca2+-sensitive fluorescent dye (AM-ester method) and immobilised in a perfusable chamber. Cells are imaged by time-lapse fluorescence microscopy and stimulated via the perfusing medium. Responses of single cells (or regions) are analysed offline using Excel.

Görüntüleme Ca Teknikleri 2 + İnsan Sperm sinyal

Fluorescence microscopy of cells loaded with fluorescent, Ca2+-sensitive dyes is used for measurement of spatial and temporal aspects of Ca2+ signaling in ...

Biyoloji

Flow Cytometry Purification of Mouse Meiotic Cells

The heterogeneous nature of cell types in the testis and the absence of meiotic cell culture models have been significant hurdles to the study of the unique differentiation programs that are manifest during meiosis. Two principal methods have been developed to purify, to varying degrees, various meiotic fractions from both adult and immature animals: elutriation or Staput (sedimentation) using BSA and/or percoll gradients. Both of these methods rely on cell size and density to separate meiotic cells1-5. Overall, except for few cell populations6, these protocols fail to yield sufficient purity of the numerous meiotic cell populations that are necessary for detailed molecular analyses. Moreover, with such methods usually one type of meiotic cells can be purified at a given time, which adds an extra level of complexity regarding the reproducibility and homogeneity when comparing meiotic cell samples.
Here, we describe a refined method that allows one to easily visualize, identify, and purify meiotic cells, from germ cells to round spermatids, using FACS combined with Hoechst 33342 staining7,8. This method provides an overall snapshot of the entire meiotic process and allows one to highly purify viable cells from most stage of meiosis. These purified cells can then be analyzed in detail for molecular changes that accompany progression through meiosis, for example changes in gene expression9,10and the dynamics of nucleosome occupancy at hotspots of meiotic recombination11.

An efficient method to obtain highly purified viable meiotic fractions from mouse testis is described, which combines a refined cell dissociation protocol with fluorescent activated cell sorting (FACS). This method takes advantage of differences in the DNA content and nuclear density of discrete meiotic fractions.

Fare Mayotik Hücreler Sitometrisi Arıtma

The heterogeneous nature of cell types in the testis and the absence of meiotic cell culture models have been significant hurdles to the study of the ...

Measuring Cell Cycle Progression Kinetics with Metabolic Labeling and Flow Cytometry

Precise control of the initiation and subsequent progression through the various phases of the cell cycle are of paramount importance in proliferating cells. Cell cycle division is an integral part of growth and reproduction and deregulation of key cell cycle components have been implicated in the precipitating events of carcinogenesis 1,2. Molecular agents in anti-cancer therapies frequently target biological pathways responsible for the regulation and coordination of cell cycle division 3. Although cell cycle kinetics tend to vary according to cell type, the distribution of cells amongst the four stages of the cell cycle is rather consistent within a particular cell line due to the consistent pattern of mitogen and growth factor expression. Genotoxic events and other cellular stressors can result in a temporary block of cell cycle progression, resulting in arrest or a temporary pause in a particular cell cycle phase to allow for instigation of the appropriate response mechanism. 
The ability to experimentally observe the behavior of a cell population with reference to their cell cycle progression stage is an important advance in cell biology. Common procedures such as mitotic shake off, differential centrifugation or flow cytometry-based sorting are used to isolate cells at specific stages of the cell cycle 4-6. These fractionated, cell cycle phase-enriched populations are then subjected to experimental treatments. Yield, purity and viability of the separated fractions can often be compromised using these physical separation methods. As well, the time lapse between separation of the cell populations and the start of experimental treatment, whereby the fractionated cells can progress from the selected cell cycle stage, can pose significant challenges in the successful implementation and interpretation of these experiments.
Other approaches to study cell cycle stages include the use of chemicals to synchronize cells. Treatment of cells with chemical inhibitors of key metabolic processes for each cell cycle stage are useful in blocking the progression of the cell cycle to the next stage. For example, the ribonucleotide reductase inhibitor hydroxyurea halts cells at the G1/S juncture by limiting the supply of deoxynucleotides, the building blocks of DNA. Other notable chemicals include treatment with aphidicolin, a polymerase alpha inhibitor for G1 arrest, treatment with colchicine and nocodazole, both of which interfere with mitotic spindle formation to halt cells in M phase and finally, treatment with the DNA chain terminator 5-fluorodeoxyridine to initiate S phase arrest 7-9. Treatment with these chemicals is an effective means of synchronizing an entire population of cells at a particular phase. With removal of the chemical, cells rejoin the cell cycle in unison. Treatment of the test agent following release from the cell cycle blocking chemical ensures that the drug response elicited is from a uniform, cell cycle stage-specific population. However, since many of the chemical synchronizers are known genotoxic compounds, teasing apart the participation of various response pathways (to the synchronizers vs. the test agents) is challenging. 
Here we describe a metabolic labeling method for following a subpopulation of actively cycling cells through their progression from the DNA replication phase, through to the division and separation of their daughter cells. Coupled with flow cytometry quantification, this protocol enables for measurement of kinetic progression of the cell cycle in the absence of either mechanically- or chemically- induced cellular stresses commonly associated with other cell cycle synchronization methodologies 10. In the following sections we will discuss the methodology, as well as some of its applications in biomedical research.

Tracking subtle changes in the progression and kinetics of cell cycle stages can be accomplished by use of a combination of metabolic labeling of nucleic acids with BrdU and total genomic DNA staining via Propidium Iodide. This method avoids the need of chemical synchronization of cycling cells, thereby preventing the introduction of non-specific DNA damage, which in turn affects cell cycle progression.

Metabolik Etiketleme ve Flow Sitometri ile Hücre Döngüsü İlerleme Kinetik Ölçüm

Precise control of the initiation and subsequent progression through the various phases of the cell cycle are of paramount importance in proliferating ...

Optimized Staining and Proliferation Modeling Methods for Cell Division Monitoring using Cell Tracking Dyes

Fluorescent cell tracking dyes, in combination with flow and image cytometry, are powerful tools with which to study the interactions and fates of different cell types in vitro and in vivo.1-5 Although there are literally thousands of publications using such dyes, some of the most commonly encountered cell tracking applications include monitoring of:
<ol>
	<li>stem and progenitor cell quiescence, proliferation and/or differentiation6-8</li>
	<li>antigen-driven membrane transfer9 and/or precursor cell proliferation3,4,10-18 and</li>
	<li>immune regulatory and effector cell function1,18-21.</li>
</ol>
Commercially available cell tracking dyes vary widely in their chemistries and fluorescence properties but the great majority fall into one of two classes based on their mechanism of cell labeling. "Membrane dyes", typified by PKH26, are highly lipophilic dyes that partition stably but non-covalently into cell membranes1,2,11. "Protein dyes", typified by CFSE, are amino-reactive dyes that form stable covalent bonds with cell proteins4,16,18. Each class has its own advantages and limitations. The key to their successful use, particularly in multicolor studies where multiple dyes are used to track different cell types, is therefore to understand the critical issues enabling optimal use of each class2-4,16,18,24.
The protocols included here highlight three common causes of poor or variable results when using cell-tracking dyes. These are:
<ol>
	<li>Failure to achieve bright, uniform, reproducible labeling. This is a necessary starting point for any cell tracking study but requires attention to different variables when using membrane dyes than when using protein dyes or equilibrium binding reagents such as antibodies.</li>
	<li>Suboptimal fluorochrome combinations and/or failure to include critical compensation controls. Tracking dye fluorescence is typically 102 - 103 times brighter than antibody fluorescence. It is therefore essential to verify that the presence of tracking dye does not compromise the ability to detect other probes being used.</li>
	<li>Failure to obtain a good fit with peak modeling software. Such software allows quantitative comparison of proliferative responses across different populations or stimuli based on precursor frequency or other metrics. Obtaining a good fit, however, requires exclusion of dead/dying cells that can distort dye dilution profiles and matching of the assumptions underlying the model with characteristics of the observed dye dilution profile.</li>
</ol>
Examples given here illustrate how these variables can affect results when using membrane and/or protein dyes to monitor cell proliferation.

Successful use of cell tracking dyes to monitor immune cell function and proliferation involves several critical steps. We describe methods for: 1) obtaining bright, uniform, reproducible label-ing with membrane dyes; 2) selecting fluorochromes and data acquisition conditions; and 3) choosing a model to quantify cell proliferation based on dye dilution.

Cep Takip Boyalar kullanarak Hücre Bölünmesi İzleme için optimize Boyama ve Çoğalma Modelleme Yöntemleri

Fluorescent cell tracking dyes, in combination with flow and image cytometry, are powerful tools with which to study the interactions and fates of ...

The Xenopus Oocyte Cut-open Vaseline Gap Voltage-clamp Technique With Fluorometry

The cut-open oocyte Vaseline gap (COVG) voltage clamp technique allows for analysis of electrophysiological and kinetic properties of heterologous ion channels in oocytes. Recordings from the cut-open setup are particularly useful for resolving low magnitude gating currents, rapid ionic current activation, and deactivation. The main benefits over the two-electrode voltage clamp (TEVC) technique include increased clamp speed, improved signal-to-noise ratio, and the ability to modulate the intracellular and extracellular milieu.
Here, we employ the human cardiac sodium channel (hNaV1.5), expressed in Xenopus oocytes, to demonstrate the cut-open setup and protocol as well as modifications that are required to add voltage clamp fluorometry capability.
The properties of fast activating ion channels, such as hNaV1.5, cannot be fully resolved near room temperature using TEVC, in which the entirety of the oocyte membrane is clamped, making voltage control difficult. However, in the cut-open technique, isolation of only a small portion of the cell membrane allows for the rapid clamping required to accurately record fast kinetics while preventing channel run-down associated with patch clamp techniques.
In conjunction with the COVG technique, ion channel kinetics and electrophysiological properties can be further assayed by using voltage clamp fluorometry, where protein motion is tracked via cysteine conjugation of extracellularly applied fluorophores, insertion of genetically encoded fluorescent proteins, or the incorporation of unnatural amino acids into the region of interest1. This additional data yields kinetic information about voltage-dependent conformational rearrangements of the protein via changes in the microenvironment surrounding the fluorescent molecule.

The Xenopus Oocyte Cut-open Vaseline Gap Voltage-clamp Technique With Fluorometry

The cut-open Vaseline gap approach is used to obtain low noise recordings of ionic and gating currents from voltage-dependent ion channels expressed in Xenopus oocytes with high resolution of fast channel kinetics. With minor modification, voltage clamp fluorometry can be coupled to the cut-open oocyte protocol.

<em&gt; Xenopus</emFluorometri ile&gt; Yumurta Kes-açık Vazelin Gap Gerilim-kelepçe Tekniği

The cut-open oocyte Vaseline gap (COVG) voltage clamp technique allows for analysis of electrophysiological and kinetic properties of heterologous ion ...

Techniques for the Analysis of Extracellular Vesicles Using Flow Cytometry

Extracellular Vesicles (EVs) are small, membrane-derived vesicles found in bodily fluids that are highly involved in cell-cell communication and help regulate a diverse range of biological processes. Analysis of EVs using flow cytometry (FCM) has been notoriously difficult due to their small size and lack of discrete populations positive for markers of interest. Methods for EV analysis, while considerably improved over the last decade, are still a work in progress. Unfortunately, there is no one-size-fits-all protocol, and several aspects must be considered when determining the most appropriate method to use. Presented here are several different techniques for processing EVs and two protocols for analyzing EVs using either individual detection or a bead-based approach. The methods described here will assist with eliminating the antibody aggregates commonly found in commercial preparations, increasing signal&#8211;to-noise ratio, and setting gates in a rational fashion that minimizes detection of background fluorescence. The first protocol uses an individual detection method that is especially well suited for analyzing a high volume of clinical samples, while the second protocol uses a bead-based approach to capture and detect smaller EVs and exosomes.

Many different methods exist for the measurement of extracellular vesicles (EVs) using flow cytometry (FCM). Several aspects should be considered when determining the most appropriate method to use. Two protocols for measuring EVs are presented, using either individual detection or a bead-based approach.

Akım Sitometri Kullanımı Ekstrasellüler Veziküller Analizi Teknikleri

Extracellular Vesicles (EVs) are small, membrane-derived vesicles found in bodily fluids that are highly involved in cell-cell communication and help ...

LED Thermo Flow &#8212; Combining Optogenetics with Flow Cytometry

Optogenetic tools allow isolated, functional investigations of almost any signaling molecule within complex signaling pathways. A major obstacle is the controlled delivery of light to the cell sample and hence the most popular tools for optogenetic studies are microscopy-based cell analyses and in vitro experiments. The flow cytometer has major advantages over a microscope, including the ability to rapidly measure thousands of cells at single cell resolution. However, it is not yet widely used in optogenetics. Here, we present a device that combines the power of optogenetics and flow cytometry: the LED Thermo Flow. This device illuminates cells at specific wavelengths, light intensities and temperatures during flow cytometric measurements. It can be built at low cost and be used with most common flow cytometers. To demonstrate its utility, we characterized the photoswitching kinetics of Dronpa proteins in vivo and in real time. This protocol can be adapted to almost all optically controlled substances and substantially expands the set of possible experiments. More importantly, it will greatly simplify the discovery and development of new optogenetic tools.

Optically controlled substances are powerful tools to study signaling pathways. To expand the spectrum of possible experiments, we developed a device for studying optically controlled substances in real time using flow cytometry: the LED Thermo Flow.

LED Thermo Akışı - Akım Sitometrisi ile optogenetics birleştiren

Optogenetic tools allow isolated, functional investigations of almost any signaling molecule within complex signaling pathways. A major obstacle is the ...

Analysis of Cell Suspensions Isolated from Solid Tissues by Spectral Flow Cytometry

Flow cytometry has been used for the past 40 years to define and analyze the phenotype of lymphoid and other hematopoietic cells. Initially restricted to the analysis of a few fluorochromes, currently there are dozens of different fluorescent dyes, and up to 14-18 different dyes can be combined at a time. However, several limitations still impair the analytical capabilities. Because of the multiplicity of fluorescent probes, data analysis has become increasingly complex due to the need of large, multi-parametric compensation matrices. Moreover, mutant mouse models carrying fluorescent proteins to detect and trace specific cell types in different tissues have become available, so the analysis (by flow cytometry) of auto-fluorescent cell suspensions obtained from solid organs is required. Spectral flow cytometry, which distinguishes the shapes of emission spectra along a wide range of continuous wavelengths, addresses some of these problems. The data is analyzed with an algorithm that replaces compensation matrices and treats auto-fluorescence as an independent parameter. Thus, spectral flow cytometry should be capable of discriminating fluorochromes with similar emission peaks and can provide a multi-parametric analysis without compensation requirements.
This protocol describes the spectral flow cytometry analysis, allowing for a 21-parameter (19 fluorescent probes) characterization and the management of an auto-fluorescent signal, providing high resolution in minor population detection. The results presented here show that spectral flow cytometry presents advantages in the analysis of cell populations from tissues difficult to characterize in conventional flow cytometry, such as the heart and the intestine. Spectral flow cytometry thus demonstrates the multi-parametric analytical capacity of high-performing conventional flow cytometry without the requirement for compensation and enables auto-fluorescence management.

This article describes spectral cytometry, a new approach in flow cytometry that uses the shapes of emission spectra to distinguish fluorochromes. An algorithm replaces compensations and can treat auto-fluorescence as an independent parameter. This new approach allows for the proper analysis of cells isolated from solid organs.

Spektral Sitometrisi ile Katı Dokular İzole Hücre Cezalar Analizi

Flow cytometry has been used for the past 40 years to define and analyze the phenotype of lymphoid and other hematopoietic cells. Initially restricted to ...

Assessing Autophagic Flux by Measuring LC3, p62, and LAMP1 Co-localization Using Multispectral Imaging Flow Cytometry

Autophagy is a catabolic pathway in which normal or dysfunctional cellular components that accumulate during growth and differentiation are degraded via the lysosome and are recycled. During autophagy, cytoplasmic LC3 protein is lipidated and recruited to the autophagosomal membranes. The autophagosome then fuses with the lysosome to form the autolysosome, where the breakdown of the autophagosome vesicle and its contents occurs. The ubiquitin-associated protein p62, which binds to LC3, is also used to monitor autophagic flux. Cells undergoing autophagy should demonstrate the co-localization of p62, LC3, and lysosomal markers. Immunofluorescence microscopy has been used to visually identify LC3 puncta, p62, and/or lysosomes on a per-cell basis. However, an objective and statistically rigorous assessment can be difficult to obtain. To overcome these problems, multispectral imaging flow cytometry was used along with an analytical feature that compares the bright detail images from three autophagy markers (LC3, p62 and lysosomal LAMP1) and quantifies their co-localization, in combination with LC3 spot counting to measure autophagy in an objective, quantitative, and statistically robust manner.

Here, multispectral imaging flow cytometry with an analytical feature that compares bright detail images of 3 autophagy markers and quantifies their co-localization, along with LC3 spot counting, was used to measure autophagy in an objective, quantitative, and statistically robust manner.

Multifektral Görüntüleme Akış Sitometrisi Kullanılarak LC3, p62 ve LAMP1 Birlikte Lokalizasyonu Ölçülerek Otofajik Fluxın Değerlendirilmesi

Autophagy is a catabolic pathway in which normal or dysfunctional cellular components that accumulate during growth and differentiation are degraded via ...

Measuring Endoreduplication by Flow Cytometry of Isolated Tuber Protoplasts

Endoreduplication, the replication of a cell's nuclear genome without subsequent cytokinesis, yields cells with increased DNA content and is associated with specialization, development and increase in cellular size. In plants, endoreduplication seems to facilitate the growth and expansion of certain tissues and organs. Among them is the tuber of potato (Solanum tuberosum), which undergoes considerable cellular expansion in fulfilling its function of carbohydrate storage. Thus, endoreduplication may play an important role in how tubers are able to accommodate this abundance of carbon. However, the cellular debris resulting from crude nuclear isolation methods of tubers, methods that can be used effectively with leaves, precludes the estimation of the tuber endoreduplication index (EI). This article presents a technique for assessing tuber endoreduplication through the isolation of protoplasts while demonstrating representative results obtained from different genotypes and compartmentalized tuber tissues. The major limitations of the protocol are the time and reagent costs required for sample preparation as well as relatively short lifespan of samples after lysis of protoplasts. While the protocol is sensitive to technical variation, it represents an improvement over traditional methods of nuclear isolation from these large specialized cells. Possibilities for improvements to the protocol such as recycling enzyme, the use of fixatives, and other alterations are proposed.

The protocol described herein is a method for measuring endoreduplication within tubers of potato (Solanum tuberosum). It includes plasmolysis and protoplast extraction steps to decrease the noise and debris in downstream flow cytometric analysis.

Endoreduplication izole yumru önceki Akış Sitometresi tarafından ölçme

Endoreduplication, the replication of a cell's nuclear genome without subsequent cytokinesis, yields cells with increased DNA content and is associated ...

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Görüntüleme Ca Teknikleri^{2 +} İnsan Sperm sinyal