Çalışmalarımız Amerikan Kalp Derneği (Büyük Güneydoğu Ortaklık) Başlangıç-devlet yardımı 0765185B, Elsa U. Pardee Vakfı&#39;nın araştırma bursu ve Wayne State Üniversitesi intramural başlangıç ​​fonu ve Damar Araştırma Enstitüsü İsis Girişimi ödülü gelen hibelerle desteklenmektedir. In vitro CFTR makromoleküler karmaşık montaj Bu yöntem başlangıçta Dr AP Naren (Tennessee Sağlık Bilimleri Merkezi Üniversitesi) tarafından öncülük edilmiştir.

1. Bakterilerde Rekombinant Takip edilen Fusion Proteinlerin İfade ve Arıtma <ol><li> CFTR, LPA 2, MRP2, MRP4, β 2 AR ve NHERFs (tam boy veya PDZ1 ya PDZ2 etki için C-kuyrukları (C-terminusta PDZ motifleri ihtiva eden son 50-100 amino asitleri) ile tanımlanan bölgeler amplifiye ) PCR yaklaşım. </li><li> GST-füzyon proteinleri için pGEX4T-1 vektör (örneğin GST-NHERFs, GST-MRP4 CT), MBP-füzyon proteinleri için pMAL-C2 vektör (örneğin MBP-β 2 AR CT, MBP-CFTR CT içine PCR ürünleri Clone ), ve His-S-füzyon proteinleri (örneğin, His-S-CFTR CT olarak, His-S-PDZK1) için pET30. </li><li> Bir proteaz eksikliği E. Transform coli suşu (BL21-de3) olası rekombinant protein yıkımı en aza indirmek için. </li><li> Uygun antibiyotikler (örneğin, ampisilin, kanamisin veya gibi) içeren Luria-Bertani ortamı (pH 7.0) içinde 37 ° C de bir gece kültüre büyür. 1:10 gece kültürü seyreltilir ve 37 başka bir 2 saat için büyümek ° C Içinde0,5-1 m M 30 ° C&#39;de 4 saat süreyle sonraki IPTG ile Duce 8000 santrifüj ile pelet hücreleri x g 10 dakika süre ile 4 ° C. </li><li> (50 m M Tris-HCl, pH 8.0, 1 m M EDTA, 1 M m PMSF, ve% 10 sukroz) lizozim (1 mg / mL),% 0.2 Triton X-100 ve proteaz ihtiva eden tampon çözeltisi içinde, sakaroz hücrelerini Lyse inhibitörleri. Hücre topağı kültür 1 L kaynaklanan için 20 mL kullanabilir. </li><li> 4 ° C&#39;de 30 dakika süre ile, bir döner çalkalayıcıda, karıştırın </li><li> 4 ° C&#39;de 30 dakika süreyle 20,000 x g&#39;de Spin Supernatan toplayın. </li><li> Üstte yüzen berrak madde içinde, aşağıdaki reçine / agaroz boncukları (sükroz tampon çözeltisi içinde% 50 bulamaç) 1 ml: <ul><li> GST füzyon proteinleri Glutatyon agaroz boncuk. </li><li> Onun-S füzyon proteinleri için Talon boncuk. </li><li> MBP füzyon proteinleri için Amiloz reçine. </li></ul></li><li> 4 de 4 saat süreyle karışımı ° döner çalkalayıcıda, C. </li><li> 2 mi için karıştırılması, 1x PBS (15 mL) içinde resuspending ile yıkanır boncuklarn, 800 eğirme × g 2 dk ve atarak supernatant için. Altı kere için bu adımı yineleyin. </li><li> İlgili elüsyon tamponuyla (boncuklar 1 mL başına 2 mL elüsyon tamponuyla) kullanılarak boncuklar proteini elüt edilmesi. <ul><li> GST füzyon proteinleri için işlem tampon maddesi: 25 m M Tris-HCl (pH 8.0), 140 m M NaCl, 20 ve m M glutation azaltılabilir. </li><li> His füzyon proteinleri için işlem tampon maddesi: 20 m M Tris-HCl (pH 8.0), 500 m M NaCl ve 200 m M imidazol. </li><li> MBP füzyon proteinleri için işlem tampon maddesi: 20 m M Tris-HCl (pH 8.0), 200 m M NaCl, 1 m M EDTA, 1 m M DTT ve 10 m M maltoz. </li></ul></li><li> 4 azından 1x PBS 2 L karşı Elüsyonlanan protein Dialyze ° C (mümkün proteini düşüşü önlemek üzere). PBS dört kez 4 saatte değiştirin. -80 Düzeyinde küçük hacimde bir Centricon filtresi (10,000 MW kesim, Millipore) ve mağaza kullanarak proteini konsantresi ° C </li><li> DetBradford yöntemiyle protein konsantrasyonu ermin. SDS-PAGE standartlar olarak BSA kullanarak protein kalitesini değerlendirin. Proteinin bütünlüğü tatminkar değil ise, bu tür jel filtrasyonu ya da iyon değişimi gibi ikincil saflaştırma işlemleri de kullanılabilir. (Örneğin, biz daha GST-füzyon proteini arındırmak için bir G-75 sepharose kolon kullanılmıştır). </li></ol> 2. Hücre Kültürü ve Hücre Lysate Hazırlık <ol><li> Kültür bebek Hamster böbrek (BHK) hücreleri stabil aşırı ekspres CFTR-wt ve CFTR-his10 veya BHK hücrelerinde geçici aşırı ekspres Bayrak-LPA 2-wt veya Bayrak-LPA 2-ΔSTL ve Madin-Darby canine böbrek (MDCK Eagle minimum gerekli ortamda stabil bir şekilde aşırı ifade MRP2 (MEM)% 5 CO2 ile 37 az% 10 fetal dana serumu ve penisilin / streptomisin polistiren şişeler içerisinde ° C ihtiva eden) hücre. </li><li> Kültür insan embriyonik böbrek 293 (HEK293) hücreleri stabil aşırı ekspres CFTR-wt ve Dulbecco CFTR-his10&#39;% 5 CO2 ile 37 ° C&#39;de% 10 fetal bovin serumu ve penisilin / streptomisin polistiren şişeler içinde ilave s değiştirilmiş Eagle ortamı (DMEM). </li><li> Kullanımı; - (% 0.2 Triton X-100-1 m M phenylmethylsulphonyl flor, 1 ug / mL aprotinin, 1 ug / ml löpeptin, 1 ug / ml pepstatin içeren proteaz inhibitörleri oluşan bir karışım ile desteklenmiş PBS) Lysis Buffer hücrelerin Lyse Her 60 mm petri ve her 100 mm petri için 1000 uL lizis tamponu için 500 uL lizis tamponu. </li><li> Hücre ° C, ve 4 de 15 dakika boyunca 16.000 santrifüj ile erimeyen madde x g kaldırmak ° C&#39;de 4 azından 20 dakika boyunca sallayın lizatları Bradford testi ile protein konsantrasyonu belirler. </li></ol> 3. Bir CFTR içeren makromoleküler Kompleksi İn Vitro Kurulu&#39;nda (CFTR-PDZK1-MRP4) <ol><li> Lizis tampon 200 ul (PBS -% 0.2 Triton X-100 + proteaz inhibitörleri) içine, 20 mikrogram arıtılmış GST-MRP4-C terminali ekleyin50 aa (CT50) füzyon proteini. </li><li> Onun-S-PDZK1 füzyon proteini arıtılmış çeşitli miktarlarda (0-40 mg) ekleyin. </li><li> 22 ° C&#39;de 1-2 saat için bir döner mikser üzerinde iki protein karıştırılır. </li><li> Protein karışımı içine 20 uL glutation boncuklar (50% bulamaç) eklenir, ve başka bir 1 saat boyunca karıştırmaya devam edin. Bu aşama, aynı zamanda çift-akıllı bağlanma olarak ifade edilir. </li><li> Bu süre esnasında, HEK293 hücre lizatları hazırlanması yukarıda adım 2&#39;de açıklandığı gibi olarak artmış bayrak-CFTR (wt)). </li><li> Lizis tamponu ile iki kez karmaşık yıkayın. Her yıkama için 1 dakika için 800 × g Spin ve dikkatle her yıkamadan sonra süpernatant aspire. Alt boncuk emmek için dikkatli kullanın. </li><li> Boncuklara yukarıda hazırlanmış HEK293 hücre lizatları ekleyin ve yavaşça 3 saat (ya da gece boyunca) için 4 ° C&#39;de karıştırılır. </li><li> Adım boncuklar 3.6) içinde tarif edildiği gibi lizis tamponu ile yaygın üç kez yıkanır. </li><li> 30 uL numune tamponu (5 x) kullanılarak proteinleri elüt edilmesi: 0.6 M<html> Tris-HCl (pH 6.8),% 50 gliserol,% 2 SDS, ve% 0.1 mavi Bromofenol; içeren% 5 β-merkaptoetanol. </li><li> 5.000 az 10-15 dakika ve spin ° C su banyosunda × g 30 s için boncuk çöktürmek için 37 inkübe edin. </li><li> 4-15% jel üzerine tüm eluat yükleyin. </li><li> 30-40 dakika için SDS-PAGE çalıştırın. </li><li> 1.5 saat için, PVDF membran protein bantları aktarın. </li><li> % 5 yağsız süt ihtiva eden olmayan TBS-Tween içindeki membran bloke eder. </li><li> 4 azından primer antikor (anti-IgG CFTR, R1104 gibi) ile membran ° C, bir gece boyunca inkübe edilir. </li><li> 5 dk, altı kez TBS-Tween ile membran yıkanır. </li><li> 22 ° C&#39;de 45 dakika süreyle sekonder antikor (örneğin, keçi anti-fare HRP bağlı 2. antikoru gibi) ile inkübe membran </li><li> 5 dk, altı kez TBS-Tween ile membran yıkanır. </li><li> ECL yoluyla protein bantları gözünüzde canlandırın. </li><li> Temsilci veriler Şekil 1&#39;de gösterilmiştir. </li></ol>jove_title &quot;&gt; 4. Temsilcisi Sonuçlar In vitro olarak monte edilmiştir CFTR-içeren makromoleküler sinyalleşme karmaşık bir örnek Şekil 1 &#39;de gösterilmiştir. A makromoleküler kompleksi MRP4 C-terminal 50 amino asitleri (MRP4-CT50), PDZK1, ve tam uzunlukta CFTR (Şekil 1, alt) arasında oluştu. Kompleks oluşumu aracılık protein, PDZK1 (Şekil 1, alt) 18 artan miktarlarda ile doza bağımlı arttı. <img alt="Şekil 1" src="/files/ftp_upload/4091/4091fig1.jpg" /> Şekil 1. Makromoleküler karmaşık testin bir resimsel gösterimi (üstte). Bir makromoleküler karmaşık bir doza bağımlı (alt) 18 üç protein (GST-MRP4-CT50, O&#39;nun-S-PDZK1 ve Bayrak-CFTRwt) ile in vitro olarak tespit edildi. <table border="1"><tbody><tr><td></td><td><strong&gt; CFTR-NHERF1-β 2 AR (bkz. 14) </td><td> CFTR-NHERF2-LPA 2 (bkz. 15) </td><td> CFTR-PDZ proteinler-MRP 2 (bkz. 17) </td><td> CFTR-PDZK1-MRP4 (bkz. 16) </td></tr><tr><td> Affinity boncuk </td><td> Amiloz reçine </td><td> G-proteinine agaroz </td><td> Amiloz reçine </td><td> Glutatyon agaroz </td></tr><tr><td> Protein-1 Saf </td><td> MBP-β 2 AR CT </td><td> His-S-CFTR CT </td><td> MBP-CFTR CT </td><td> GST-MRP4 CT </td></tr><tr><td> Protein-2 saflaştırılmış </td><td> GST-NHERF1 </td><td> GST-NHERF2 </td><td> GST-PDZ proteinleri </td><td> His-S-PDZK1 </td></tr><tr><td> (Veya hücre lizatları) Protein-3 saflaştırılmış </td><td> CFTR-wt ya CFTR-his10 (BHK ya HEK hücre lizatları) </td><td> BayrakLPA-2-wt ya bayrak-LPA 2-ΔSTL (BHK hücre lizatları) </td><td> MRP2 (MDCK hücre lizatları) </td><td> Bayrak-CFTR-wt veya CFTR-his10 (veya hücre lizatları) Saf </td></tr><tr><td> Antikor </td><td> Anti-CFTR IgG </td><td> Anti-Flag HRP </td><td> Anti-MRP2 IgG </td><td> Anti-Flag HRP </td></tr></tbody></table> In vitro monte çeşitli CFTR içeren makromoleküler kompleksleri Tablo 1. Özeti.

<ol>
	<li>Anderson, M. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Demonstration+that+CFTR+is+a+chloride+channel+by+alteration+of+its+anion+selectivity.">Demonstration that CFTR is a chloride channel by alteration of its anion selectivity.</a> Science. 253, 202-205 (1991).</li><li>Bear, C. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Purification+and+functional+reconstitution+of+the+cystic+fibrosis+transmembrane+conductance+regulator+(CFTR.">Purification and functional reconstitution of the cystic fibrosis transmembrane conductance regulator (CFTR.</a> Cell. 68, 809-818 (1992).</li><li>Quinton, P. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Chloride+impermeability+in+cystic+fibrosis.">Chloride impermeability in cystic fibrosis.</a> Nature. 301, 421-422 (1983).</li><li>Cheng, S. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Defective+intracellular+transport+and+processing+of+CFTR+is+the+molecular+basis+of+most+cystic+fibrosis.">Defective intracellular transport and processing of CFTR is the molecular basis of most cystic fibrosis.</a> Cell. 63, 827-834 (1990).</li><li>Gabriel, S. E., Brigman, K. N., Koller, B. H., Boucher, R. C., Stutts, M. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cystic+fibrosis+heterozygote+resistance+to+cholera+toxin+in+the+cystic+fibrosis+mouse+model.">Cystic fibrosis heterozygote resistance to cholera toxin in the cystic fibrosis mouse model.</a> Science. 266, 107-109 (1994).</li><li>Li, C., Naren, A. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=CFTR+chloride+channel+in+the+apical+compartments:+spatiotemporal+coupling+to+its+interacting+partners.">CFTR chloride channel in the apical compartments: spatiotemporal coupling to its interacting partners.</a> Integr. Biol (Camb). 2, 161-177 (2010).</li><li>Chao, A. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Activation+of+intestinal+CFTR+Cl-+channel+by+heat-stable+enterotoxin+and+guanylin+via+cAMP-dependent+protein+kinase.">Activation of intestinal CFTR Cl- channel by heat-stable enterotoxin and guanylin via cAMP-dependent protein kinase.</a> Embo. J. 13, 1065-1072 (1994).</li><li>Gabriel, S. E., Clarke, L. L., Boucher, R. C., Stutts, M. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=CFTR+and+outward+rectifying+chloride+channels+are+distinct+proteins+with+a+regulatory+relationship.">CFTR and outward rectifying chloride channels are distinct proteins with a regulatory relationship.</a> Nature. 363, 263-268 (1993).</li><li>McNicholas, C. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Sensitivity+of+a+renal+K++channel+(ROMK2)+to+the+inhibitory+sulfonylurea+compound+glibenclamide+is+enhanced+by+coexpression+with+the+ATP-binding+cassette+transporter+cystic+fibrosis+transmembrane+regulator.">Sensitivity of a renal K+ channel (ROMK2) to the inhibitory sulfonylurea compound glibenclamide is enhanced by coexpression with the ATP-binding cassette transporter cystic fibrosis transmembrane regulator.</a> Proc. Natl. Acad. Sci. USA. 93, 8083-8088 (1996).</li><li>Schreiber, R., Nitschke, R., Greger, R., Kunzelmann, K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+cystic+fibrosis+transmembrane+conductance+regulator+activates+aquaporin+3+in+airway+epithelial+cells.">The cystic fibrosis transmembrane conductance regulator activates aquaporin 3 in airway epithelial cells.</a> J. Biol. Chem. 274, 11811-11816 (1999).</li><li>Shumaker, H., Amlal, H., Frizzell, R., Ulrich, C. D., Soleimani, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=CFTR+drives+Na+-nHCO-3+cotransport+in+pancreatic+duct+cells:+a+basis+for+defective+HCO-3+secretion+in+CF.">CFTR drives Na+-nHCO-3 cotransport in pancreatic duct cells: a basis for defective HCO-3 secretion in CF.</a> Am. J. Physiol. 276, 16-25 (1999).</li><li>Ahn, W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Regulatory+interaction+between+the+cystic+fibrosis+transmembrane+conductance+regulator+and+HCO3-+salvage+mechanisms+in+model+systems+and+the+mouse+pancreatic+duct.">Regulatory interaction between the cystic fibrosis transmembrane conductance regulator and HCO3- salvage mechanisms in model systems and the mouse pancreatic duct.</a> J. Biol. Chem. 276, 17236-17243 (2001).</li><li>Sugita, M., Yue, Y., Foskett, J. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=CFTR+Cl-+channel+and+CFTR-associated+ATP+channel:+distinct+pores+regulated+by+common+gates.">CFTR Cl- channel and CFTR-associated ATP channel: distinct pores regulated by common gates.</a> Embo. J. 17, 898-908 (1998).</li><li>Naren, A. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Regulation+of+CFTR+chloride+channels+by+syntaxin+and+Munc18+isoforms.">Regulation of CFTR chloride channels by syntaxin and Munc18 isoforms.</a> Nature. 390, 302-305 (1997).</li><li>Naren, A. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Syntaxin+1A+is+expressed+in+airway+epithelial+cells,+where+it+modulates+CFTR+Cl(-)+currents.">Syntaxin 1A is expressed in airway epithelial cells, where it modulates CFTR Cl(-) currents.</a> J. Clin. Invest. 105, 377-386 (2000).</li><li>Naren, A. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+macromolecular+complex+of+beta+2+adrenergic+receptor,+CFTR,+and+ezrin/radixin/moesin-binding+phosphoprotein+50+is+regulated+by+PKA.">A macromolecular complex of beta 2 adrenergic receptor, CFTR, and ezrin/radixin/moesin-binding phosphoprotein 50 is regulated by PKA.</a> Proc. Natl. Acad. Sci. USA. 100, 342-346 (1073).</li><li>Li, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Lysophosphatidic+acid+inhibits+cholera+toxin-induced+secretory+diarrhea+through+CFTR-dependent+protein+interactions.">Lysophosphatidic acid inhibits cholera toxin-induced secretory diarrhea through CFTR-dependent protein interactions.</a> J. Exp. Med. 202, 975-986 (2005).</li><li>Li, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Spatiotemporal+coupling+of+cAMP+transporter+to+CFTR+chloride+channel+function+in+the+gut+epithelia.">Spatiotemporal coupling of cAMP transporter to CFTR chloride channel function in the gut epithelia.</a> Cell. 131, 940-951 (2007).</li><li>Li, C., Schuetz, J. D., Naren, A. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Tobacco+carcinogen+NNK+transporter+MRP2+regulates+CFTR+function+in+lung+epithelia:+implications+for+lung+cancer.">Tobacco carcinogen NNK transporter MRP2 regulates CFTR function in lung epithelia: implications for lung cancer.</a> Cancer Lett. 292, 246-253 (2010).</li><li>Hall, R. 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+C-terminal+motif+found+in+the+beta2-adrenergic+receptor,+P2Y1+receptor+and+cystic+fibrosis+transmembrane+conductance+regulator+determines+binding+to+the+Na+/H++exchanger+regulatory+factor+family+of+PDZ+proteins.">A C-terminal motif found in the beta2-adrenergic receptor, P2Y1 receptor and cystic fibrosis transmembrane conductance regulator determines binding to the Na+/H+ exchanger regulatory factor family of PDZ proteins.</a> Proc. Natl. Acad. Sci. U.S.A. 95, 8496-8501 (1998).</li><li>Short, D. B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=An+apical+PDZ+protein+anchors+the+cystic+fibrosis+transmembrane+conductance+regulator+to+the+cytoskeleton.">An apical PDZ protein anchors the cystic fibrosis transmembrane conductance regulator to the cytoskeleton.</a> J. Biol. Chem. 273, 19797-19801 (1998).</li><li>Wang, S., Yue, H., Derin, R. B., Guggino, W. B., Li, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Accessory+protein+facilitated+CFTR-CFTR+interaction,+a+molecular+mechanism+to+potentiate+the+chloride+channel+activity.">Accessory protein facilitated CFTR-CFTR interaction, a molecular mechanism to potentiate the chloride channel activity.</a> Cell. 103, 169-179 (2000).</li><li>Sun, F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=E3KARP+mediates+the+association+of+ezrin+and+protein+kinase+A+with+the+cystic+fibrosis+transmembrane+conductance+regulator+in+airway+cells.">E3KARP mediates the association of ezrin and protein kinase A with the cystic fibrosis transmembrane conductance regulator in airway cells.</a> J. Biol. Chem. 275, 29539-29546 (2000).</li><li>Cheng, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+Golgi-associated+PDZ+domain+protein+modulates+cystic+fibrosis+transmembrane+regulator+plasma+membrane+expression.">A Golgi-associated PDZ domain protein modulates cystic fibrosis transmembrane regulator plasma membrane expression.</a> J. Biol. Chem. 277, 3520-3529 (1074).</li><li>Scott, R. O., Thelin, W. R., Milgram, S. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+novel+PDZ+protein+regulates+the+activity+of+guanylyl+cyclase+C,+the+heat-stable+enterotoxin+receptor.">A novel PDZ protein regulates the activity of guanylyl cyclase C, the heat-stable enterotoxin receptor.</a> The Journal of biological chemistry. 277, 22934-22941 (1074).</li><li>Lee, J. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Dynamic+regulation+of+cystic+fibrosis+transmembrane+conductance+regulator+by+competitive+interactions+of+molecular+adaptors.">Dynamic regulation of cystic fibrosis transmembrane conductance regulator by competitive interactions of molecular adaptors.</a> The Journal of biological chemistry. 282, 10414-10422 (2007).</li><li>Gee, H. Y., Noh, S. H., Tang, B. L., Kim, K. H., Lee, M. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Rescue+of+DeltaF508-CFTR+trafficking+via+a+GRASP-dependent+unconventional+secretion+pathway.">Rescue of DeltaF508-CFTR trafficking via a GRASP-dependent unconventional secretion pathway.</a> Cell. 146, 746-760 (2011).</li><li>Naren, A. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Methods+for+the+study+of+intermolecular+and+intramolecular+interactions+regulating+CFTR+function.">Methods for the study of intermolecular and intramolecular interactions regulating CFTR function.</a> Met. Molecul. Med. 70, 175-186 (2002).</li><li>Li, C., Roy, K., Dandridge, K., Naren, A. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Molecular+assembly+of+cystic+fibrosis+transmembrane+conductance+regulator+in+plasma+membrane.">Molecular assembly of cystic fibrosis transmembrane conductance regulator in plasma membrane.</a> The Journal of biological chemistry. 279, 24673-24684 (2004).</li><li>Li, C., Naren, A. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Analysis+of+CFTR+Interactome+in+the+Macromolecular+Complexes.">Analysis of CFTR Interactome in the Macromolecular Complexes.</a> Met. Molecul. Med. 741, 255-270 (2011).</li><li>Wu, Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+chemokine+receptor+CXCR2+macromolecular+complex+regulates+neutrophil+functions+in+inflammatory+diseases.">A chemokine receptor CXCR2 macromolecular complex regulates neutrophil functions in inflammatory diseases.</a> J. Biol. Chem. , (2011).</li></ol>

Çıkar çatışması ilan etti.

Bu protokolde Bu şekilde, daha önce 16-19,29,30 bildirilen in vitro monte edilmesi ve saflaştırılmış protein (ya da proteininin parçacıkları) ve / veya hücre lizatları kullanılarak makromoleküler sinyalleşme kompleksi ihtiva eden bir CFTR tespiti için bir yöntemi göstermektedir. Hazırlık sürecinde iyi sonuçlar aşağıdaki kritik noktalar elde etmek için özel dikkat gerektirir: <ul><li> Bu işlem tampon maddesi ile pH adım 1) &#39;de anlatıldığı gibi GST-füzyon prote...

<table border="1"><tbody><tr><td> Reaktif Adı </td><td> Şirket </td><td> Katalog numarası </td><td> Yorumlar </td></tr><tr><td> pGEX4T-1 vektör </td><td> GE Healthcare </td><td> 28-9545-49 </td><td> Eskiden Amersham Biosciences </td></tr><tr><td> pMAL-C2 vektör </td><td> New England Biolabs </td><td></td><td></td></tr><tr><td> pET30 vektör </td><td> Merck Kimyasallar </td><td> 69077-3 </td><td> Eskiden Novagen </td></tr><tr><td> Glutatyon agaroz boncuk </td><td> BD Biosciences </td><td> 554780 </td><td></td></tr><tr><td> Amiloz reçine </td><td> New England Biolabs </td><td> E8021S </td><td></td></tr><tr><td> Talon boncuk </td><td> Clontech&#39;in </td><td> 635501 </td><td></td></tr><tr><td> indirgenmiş glutatyon </td><td> BD Biosciences </td><td> 554782 </td><td></td&gt; </tr><tr><td> imidazol </td><td> Balıkçı </td><td> BP305-50 </td><td></td></tr><tr><td> maltoz </td><td> Balıkçı </td><td> BP684-500 </td><td></td></tr><tr><td> G-proteinine agaroz </td><td> Merck Kimyasallar </td><td> 69704-3 </td><td> Eskiden Novagen </td></tr><tr><td> Anti-Flag HRP </td><td> Sigma </td><td> A8592 </td><td></td></tr><tr><td> Anti-CFTR IgG </td><td> Ismarlama </td><td> R1104 </td><td> aa 722-734 de CFTR epitop tanıma mAb </td></tr><tr><td> Anti-MRP2 IgG </td><td> Chemicon Uluslararası </td><td> MAB4148 </td><td> Millipore şimdi bir parçası </td></tr></tbody></table> Tablo 2. Özel reaktifleri ve ekipmanları.

in vitro analysis of pdz-dependent cftr macromolecular signaling complexes

Kistik fibrozis transmembran kondüktans regülatörü (CFTR), öncelikle epitel hücrelerinin apikal hücre zarlarında bulunan bir klor kanalı, 1-3 transepitelyal sıvı dengesinin önemli bir rol oynar. Kistik fibrozis (CF) 4 ve sekretuar ishal 5: CFTR iki önemli hastalıklarla ilişkisi olmuştur. CF, CFTR Cl-kanalının sentez ya da işlevsel aktivitesini azalır. Bu hastalık Amerika Birleşik Devletleri&#39;nde 2500 Kafkasyalılar 6 yaklaşık 1 etkiler. Aşırı CFTR etkinliği de cAMP veya bağırsak 7 cGMP üretimini uyarır toksin kaynaklı sekretuar ishal (örneğin, kolera toksini ve ısıya dayanıklı enterotoksin tarafından E. coli) durumlarında ortaya konmuştur. Biriken deliller CFTR ve taşıyıcılar, iyon kanalları, reseptörler, kinazlar, fosfatazlar, sinyal dahil olmak üzere diğer proteinler giderek artan sayıda, arasındaki fiziksel ve fonksiyonel etkileşimlerin varlığını aklaING molekülleri ve sitoskeletal elemanları ve CFTR ve bağlayıcı protein arasındaki bu etkileşimlerin kritik in vitro ve in vivo da 8-19 CFTR-aracılı transepitelyal iyon taşıma düzenleyen dahil edilmesi gösterilmiştir. Bu protokol, biz sadece yöntemleri üzerinde durulacak bir protein bağlayan bir motif sahip CFTR karboksil terminal kuyruk arasındaki etkileşimlerin çalışmada yardım ve [motifi PSD95/Dlg1/ZO-1 (PDZ) olarak anılacaktır] Belirli bir bağlayıcı modülü ihtiva iskelesi proteinlerin grubu PDZ etki olarak anılacaktır. Şimdiye kadar, birkaç farklı PDZ iskele proteinler gibi NHERF1 gibi çeşitli akrabalıklar, NHERF2, PDZK1, PDZK2, CAL (CFTR ilişkili ligand), Shank2 ile CFTR karboksil terminal kuyruk bağlamak ve 20-27 ÇIKAN bildirilmiştir. PDZ iskele proteinler tarafından tanınır CFTR içinde PDZ motifi C terminus (yani, insan KFTR 1477-DTRL-1480) 20 son dört amino asitler olduğu. İlginç bir şekilde,CFTR akrabalıklar 22 farklı da olsa, NHERFs ve PDZK1 hem birden fazla PDZ alanı bağlayabilirsiniz. CFTR bağlayıcı bakımından Bu çok-değerliğine PDZ iskelesi proteinleri hücreleri 16-18 seçici / spesifik ve verimli bir sinyalleşme için kompleksleri sinyalleşme CFTR makromoleküler oluşumunu kolaylaştıran olabileceğini düşündürmektedir işlevsel bir öneme sahip olduğu gösterilmiştir. Çoklu biyokimyasal testler incelemek için geliştirilmiştir CFTR-içeren bu işbirliğinin immünopresipitasyon, açılan tayini, çifti-bilge birleştirme testi, kolorimetrik çifti-bilge birleştirme testi ve makromoleküler karmaşık bir montaj test 16-19,28,29 gibi protein etkileşimleri, . Burada protein-protein ya da CFTR 16-19,28,29 içeren etki alanı etki alanı etkileşimlerini incelemek için laboratuvar tarafından yaygın olarak kullanılmaktadır in vitro, karmaşık bir PDZ motifi bağımlı CFTR içeren makromoleküler montaj ayrıntılı yordamlar odaklanın.

Watch this Scientific Journal Video about In Vitro Analysis of PDZ-dependent CFTR Macromolecular Signaling Complexes at JoVE.com

In Vitro Analysis of PDZ-dependent CFTR Macromolecular Signaling Complexes

Kistik fibrozis transmembran kondüktans regülatörü (CFTR), epitelyal bir klor kanalı, çeşitli proteinler ile etkileşim ve önemli hücre süreçlerini düzenleyen bildirilmiştir; aralarında CFTR PDZ motifi aracılı etkileşimleri de belgelenmiştir. Bu protokol bizim karmaşık bir sinyal PDZ bağımlı CFTR makromoleküler birleştirmek için geliştirilen yöntemler açıklanır<em&gt; In vitro</em&gt;.

PDZ bağımlı CFTR makromoleküler Sinyal Kompleksleri İn Vitro Analizi

Cystic fibrosis transmembrane conductance regulator (CFTR), a chloride channel located primarily at the apical membranes of epithelial cells, plays a ...

in-vitro-analysis-pdz-dependent-cftr-macromolecular-signaling

Research

JoVE Journal

Biology

In Vitro Analysis of PDZ-dependent CFTR Macromolecular Signaling Complexes

10.3K Görüntüleme.  Wayne State University School of Medicine. Kistik fibrozis transmembran kondüktans regülatörü (CFTR), epitelyal bir klor kanalı, çeşitli proteinler ile etkileşim ve önemli hücre süreçlerini düzenleyen bildirilmiştir; aralarında CFTR PDZ motifi aracılı etkileşimleri de belgelenmiştir. Bu protokol bizim karmaşık bir sinyal PDZ bağımlı CFTR makromoleküler birleştirmek için geliştirilen yöntemler açıklanır In vitro.

Video: In Vitro Analysis of PDZ-dependent CFTR Macromolecular Signaling Complexes

Analysis of Schwann-astrocyte Interactions Using In Vitro Assays

Schwann cells are one of the commonly used cells in repair strategies following spinal cord injuries. Schwann cells are capable of supporting axonal regeneration and sprouting by secreting growth factors 1,2 and providing growth promoting adhesion molecules 3 and extracellular matrix molecules 4. In addition they myelinate the demyelinated axons at the site of injury 5.
However following transplantation, Schwann cells do not migrate from the site of implant and do not intermingle with the host astrocytes 6,7. This results in formation of a sharp boundary between the Schwann cells and astrocytes, creating an obstacle for growing axons trying to exit the graft back into the host tissue proximally and distally. Astrocytes in contact with Schwann cells also undergo hypertrophy and up-regulate the inhibitory molecules 8-13.
In vitro assays have been used to model Schwann cell-astrocyte interactions and have been important in understanding the mechanism underlying the cellular behaviour.
These in vitro assays include boundary assay, where a co-culture is made using two different cells with each cell type occupying different territories with only a small gap separating the two cell fronts. As the cells divide and migrate, the two cellular fronts get closer to each other and finally collide. This allows the behaviour of the two cellular populations to be analyzed at the boundary. Another variation of the same technique is to mix the two cellular populations in culture and over time the two cell types segregate with Schwann cells clumped together as islands in between astrocytes together creating multiple Schwann-astrocyte boundaries.
The second assay used in studying the interaction of two cell types is the migration assay where cellular movement can be tracked on the surface of the other cell type monolayer 14,15. This assay is commonly known as inverted coverslip assay. Schwann cells are cultured on small glass fragments and they are inverted face down onto the surface of astrocyte monolayers and migration is assessed from the edge of coverslip.
Both assays have been instrumental in studying the underlying mechanisms involved in the cellular exclusion and boundary formation. Some of the molecules identified using these techniques include N-Cadherins 15, Chondroitin Sulphate proteoglycans(CSPGs) 16,17, FGF/Heparin 18, Eph/Ephrins19.
This article intends to describe boundary assay and migration assay in stepwise fashion and elucidate the possible technical problems that might occur.

Analysis of Schwann-astrocyte Interactions Using In Vitro Assays

This article intends to describe in stepwise fashion the commonly used in vitro assays used in studying Schwann cell-asrtocyte interactions.

Schwann-astrosit Etkileşimleri Analizi In Vitro Tahliller

Schwann cells are one of the commonly used cells in repair strategies following spinal cord injuries. Schwann cells are capable of supporting axonal ...

Biyoloji

Detection of Signaling Effector-Complexes Downstream of BMP4 Using in situ PLA, a Proximity Ligation Assay

BMPs are responsible for a wide range of developmental and biological effects. BMP receptors activate (phosphorylate) the Smad1/5/8 effectors, which then, form a complex with Smad4 and translocate to the nucleus where they function as transcription factors to initiate BMP specific downstream effects 1. Traditional immuno-fluorescence techniques with antibodies against phospho-Smad peptides exhibit low sensitivity, high background and offer gross quantification as they rely on intensity of the antibody signal particularly if this is photosensitive fluorescent. In addition, phospho-Smads may not all be in complex with Smad4 and engaged in active transcription.
In situ PLA is a technology capable of detecting protein interactions with high specificity and sensitivity 2-4. This new technology couples antibody recognition with the amplification of DNA surrogate of the protein. It generates a localized, discrete signal in a form of spots revealing the exact position of the recognition event. The number of signals can be counted and compared providing a measurement. We applied in situ PLA, using the Duolink kit, with a combination of antibodies that allows the detection of the BMP signaling effectors phospho-Smad1/5/8 and Smad4 only when these are in proximity i.e. in a complex, which occurs only with signaling activation. This allowed for the first time, the visualization and measurement of endogenous BMP signaling with high specificity and sensitivity in a time course experiment under BMP4 stimulation.

Detection of Signaling Effector-Complexes Downstream of BMP4 Using in situ PLA, a Proximity Ligation Assay

Here we show how to use Proximity Ligation Assay (PLA), with a combination of antibodies to visualize Bone Morphogenetic Protein (BMP) signaling in fixed cells. This technique allowed us to follow the nuclear accumulation of endogenous BMP activated effector-complexes and quantify their levels over time under BMP4 stimulation.

Efektör-Kompleksleri kullanarak BMP4 Mansabında Sinyal Algılama In situ PLA, Proximity ligasyon Testi

BMPs are responsible for a wide range of developmental and biological effects. BMP receptors activate (phosphorylate) the Smad1/5/8 effectors, which then, ...

Rapid Genetic Analysis of Epithelial-Mesenchymal Signaling During Hair Regeneration

Hair follicle morphogenesis, a complex process requiring interaction between epithelia-derived keratinocytes and the underlying mesenchyme, is an attractive model system to study organ development and tissue-specific signaling. Although hair follicle development is genetically tractable, fast and reproducible analysis of factors essential for this process remains a challenge. Here we describe a procedure to generate targeted overexpression or shRNA-mediated knockdown of factors using lentivirus in a tissue-specific manner. Using a modified version of a hair regeneration model 5, 6, 11, we can achieve robust gain- or loss-of-function analysis in primary mouse keratinocytes or dermal cells to facilitate study of epithelial-mesenchymal signaling pathways that lead to hair follicle morphogenesis. We describe how to isolate fresh primary mouse keratinocytes and dermal cells, which contain dermal papilla cells and their precursors, deliver lentivirus containing either shRNA or cDNA to one of the cell populations, and combine the cells to generate fully formed hair follicles on the backs of nude mice. This approach allows analysis of tissue-specific factors required to generate hair follicles within three weeks and provides a fast and convenient companion to existing genetic models.

Tissue-specific analysis of a hair follicle regeneration model using lentivirus to mediate gain- or loss-of-function.

Saç Rejenerasyon sırasında epitelyal-mezenkimal Sinyal Rapid Genetik Analizi

Hair follicle morphogenesis, a complex process requiring interaction between epithelia-derived keratinocytes and the underlying mesenchyme, is an ...

A High-content Imaging Workflow to Study Grb2 Signaling Complexes by Expression Cloning

Signal transduction by growth factor receptors is essential for cells to maintain proliferation and differentiation and requires tight control. Signal transduction is initiated by binding of an external ligand to a transmembrane receptor and activation of downstream signaling cascades. A key regulator of mitogenic signaling is Grb2, a modular protein composed of an internal SH2 (Src Homology 2) domain flanked by two SH3 domains that lacks enzymatic activity. Grb2 is constitutively associated with the GTPase Son-Of-Sevenless (SOS) via its N-terminal SH3 domain. The SH2 domain of Grb2 binds to growth factor receptors at phosphorylated tyrosine residues thus coupling receptor activation to the SOS-Ras-MAP kinase signaling cascade. In addition, other roles for Grb2 as a positive or negative regulator of signaling and receptor endocytosis have been described. The modular composition of Grb2 suggests that it can dock to a variety of receptors and transduce signals along a multitude of different pathways1-3.
	Described here is a simple microscopy assay that monitors recruitment of Grb2 to the plasma membrane. It is adapted from an assay that measures changes in sub-cellular localization of green-fluorescent protein (GFP)-tagged Grb2 in response to a stimulus4-6. Plasma membrane receptors that bind Grb2 such as activated Epidermal Growth Factor Receptor (EGFR) recruit GFP-Grb2 to the plasma membrane upon cDNA expression and subsequently relocate to endosomal compartments in the cell. In order to identify in vivo protein complexes of Grb2, this technique can be used to perform a genome-wide high-content screen based on changes in Grb2 sub-cellular localization. The preparation of cDNA expression clones, transfection and image acquisition are described in detail below. Compared to other genomic methods used to identify protein interaction partners, such as yeast-two-hybrid, this technique allows the visualization of protein complexes in mammalian cells at the sub-cellular site of interaction by a simple microscopy-based assay. Hence both qualitative features, such as patterns of localization can be assessed, as well as the quantitative strength of the interaction.

A high-content screening method for the identification of novel signaling competent transmembrane receptors is described. This method is amenable to large-scale automation and allows predictions about in vivo protein binding and the sub-cellular localization of protein complexes in mammalian cells.

İfade Klonlama tarafından Grb2 Sinyal Kompleksi Eğitim için bir Yüksek içerik Görüntüleme İş Akışı

Signal  transduction by growth factor receptors is essential for cells to maintain  proliferation and differentiation and requires tight control. Signal  ...

Mechanical Stimulation-induced Calcium Wave Propagation in Cell Monolayers: The Example of Bovine Corneal Endothelial Cells

Intercellular communication is essential for the coordination of physiological processes between cells in a variety of organs and tissues, including the brain, liver, retina, cochlea and vasculature. In experimental settings, intercellular Ca2+-waves can be elicited by applying a mechanical stimulus to a single cell. This leads to the release of the intracellular signaling molecules IP3 and Ca2+ that initiate the propagation of the Ca2+-wave concentrically from the mechanically stimulated cell to the neighboring cells. The main molecular pathways that control intercellular Ca2+-wave propagation are provided by gap junction channels through the direct transfer of IP3 and by hemichannels through the release of ATP. Identification and characterization of the properties and regulation of different connexin and pannexin isoforms as gap junction channels and hemichannels are allowed by the quantification of the spread of the intercellular Ca2+-wave, siRNA, and the use of inhibitors of gap junction channels and hemichannels. Here, we describe a method to measure intercellular Ca2+-wave in monolayers of primary corneal endothelial cells loaded with Fluo4-AM in response to a controlled and localized mechanical stimulus provoked by an acute, short-lasting deformation of the cell as a result of touching the cell membrane with a micromanipulator-controlled glass micropipette with a tip diameter of less than 1 &mu;m. We also describe the isolation of primary bovine corneal endothelial cells and its use as model system to assess Cx43-hemichannel activity as the driven force for intercellular Ca2+-waves through the release of ATP. Finally, we discuss the use, advantages, limitations and alternatives of this method in the context of gap junction channel and hemichannel research.

Intercellular Ca2+-waves are driven by gap junction channels and hemichannels. Here, we describe a method to measure intercellular Ca2+-waves in cell monolayers in response to a local single-cell mechanical stimulus and its application to investigate the properties and regulation of gap junction channels and hemichannels.

Hücre Tek katmanlar mekanik uyarılması bağlı Kalsiyum Dalga Yayılım: Sığır Kornea Endotel Hücreleri Örneği

Intercellular communication is essential for the coordination of physiological processes between cells in a variety of organs and tissues, including the ...

Metabolic Labeling and Membrane Fractionation for Comparative Proteomic Analysis of Arabidopsis thaliana Suspension Cell Cultures

Plasma membrane microdomains are features based on the physical properties of the lipid and sterol environment and have particular roles in signaling processes. Extracting sterol-enriched membrane microdomains from plant cells for proteomic analysis is a difficult task mainly due to multiple preparation steps and sources for contaminations from other cellular compartments. The plasma membrane constitutes only about 5-20% of all the membranes in a plant cell, and therefore isolation of highly purified plasma membrane fraction is challenging. A frequently used method involves aqueous two-phase partitioning in polyethylene glycol and dextran, which yields plasma membrane vesicles with a purity of 95% 1. Sterol-rich membrane microdomains within the plasma membrane are insoluble upon treatment with cold nonionic detergents at alkaline pH. This detergent-resistant membrane fraction can be separated from the bulk plasma membrane by ultracentrifugation in a sucrose gradient 2. Subsequently, proteins can be extracted from the low density band of the sucrose gradient by methanol/chloroform precipitation. Extracted protein will then be trypsin digested, desalted and finally analyzed by LC-MS/MS. Our extraction protocol for sterol-rich microdomains is optimized for the preparation of clean detergent-resistant membrane fractions from Arabidopsis thaliana cell cultures.
We use full metabolic labeling of Arabidopsis thaliana suspension cell cultures with K15NO3 as the only nitrogen source for quantitative comparative proteomic studies following biological treatment of interest 3. By mixing equal ratios of labeled and unlabeled cell cultures for joint protein extraction the influence of preparation steps on final quantitative result is kept at a minimum. Also loss of material during extraction will affect both control and treatment samples in the same way, and therefore the ratio of light and heave peptide will remain constant. In the proposed method either labeled or unlabeled cell culture undergoes a biological treatment, while the other serves as control 4.

Metabolic Labeling and Membrane Fractionation for Comparative Proteomic Analysis of Arabidopsis thaliana Suspension Cell Cultures

Here we describe a robust method for the fractionation of plant plasma membranes into detergent resistant and detergent soluble membranes based on a mixture of unlabeled and in vivo fully 15N labeled Arabidopsis thaliana cell cultures. The procedure is applied for comparative proteomic studies to understand signaling processes.

Mukayeseli Proteomik Analizi Metabolik Etiketleme ve Membran Fraksiyonasyon<em&gt; Arabidopsis thaliana</em&gt; Süspansiyon Hücre Kültürleri

Plasma membrane microdomains are features based on the physical properties of the lipid and sterol environment and have particular roles in signaling ...

Isolation and Culture of Adult Mouse Cardiomyocytes for Cell Signaling and in vitro Cardiac Hypertrophy

Technological advances have made genetically modified mice, including transgenic and gene knockout mice, an essential tool in many research fields. Adult cardiomyocytes are widely accepted as a good model for cardiac cellular physiology and pathophysiology, as well as for pharmaceutical intervention. Genetically modified mice preclude the need for complicated cardiomyocyte infection processes to generate the desired genotype, which are inefficient due to cardiomyocytes&#8217; terminal differentiation. Isolation and culture of high quantity and quality functional cardiomyocytes will dramatically benefit cardiovascular research and provide an important tool for cell signaling transduction research and drug development. Here, we describe a well-established method for isolation of adult mouse cardiomyocytes that can be implemented with little training. The mouse heart is excised and cannulated to an isolated heart system, then perfused with a calcium-free and high potassium buffer followed by type II collagenase digestion in Langendorff retrograde perfusion mode. This protocol yields a consistent result for the collection of functional adult mouse cardiomyocytes from a variety of genetically modified mice.

Isolation and Culture of Adult Mouse Cardiomyocytes for Cell Signaling and in vitro Cardiac Hypertrophy

We describe a reliable method for isolation of adult mouse cardiomyocytes. This protocol yields a consistent result for the culture of functional adult cardiomyocytes from a variety of genetically modified mice.

İzolasyon ve Kültür Yetişkin Fare Hücre Sinyal için kardiyomiyositlerin ve<em&gt; In vitro</em&gt; Kalp hipertrofisi

Technological advances have made genetically modified mice, including transgenic and gene knockout mice, an essential tool in many research fields. Adult ...

Measurement of Metabolic Rate in Drosophila using Respirometry

Metabolic disorders are a frequent problem affecting human health. Therefore, understanding the mechanisms that regulate metabolism is a crucial scientific task. Many disease causing genes in humans have a fly homologue, making Drosophila a good model to study signaling pathways involved in the development of different disorders. Additionally, the tractability of Drosophila simplifies genetic screens to aid in identifying novel therapeutic targets that may regulate metabolism. In order to perform such a screen a simple and fast method to identify changes in the metabolic state of flies is necessary. In general, carbon dioxide production is a good indicator of substrate oxidation and energy expenditure providing information about metabolic state. In this protocol we introduce a simple method to measure CO2 output from flies. This technique can potentially aid in the identification of genetic perturbations affecting metabolic rate.

Measurement of Metabolic Rate in Drosophila using Respirometry

Metabolic disorders are among one of the most common diseases in humans. The genetically tractable model organism D. melanogaster can be used to identify novel genes that regulate metabolism. This paper describes a relatively simple method which allows studying the metabolic rate in flies by measuring their CO2 production.

Metabolik Oranı Ölçümü<em&gt; Drosophila</em&gt; Respirometrik kullanarak

Metabolic disorders are a frequent problem affecting human health. Therefore, understanding the mechanisms that regulate metabolism is a crucial ...

In Vitro Reconstitution of Light-harvesting Complexes of Plants and Green Algae

In plants and green algae, light is captured by the light-harvesting complexes (LHCs), a family of integral membrane proteins that coordinate chlorophylls and carotenoids. In vivo, these proteins are folded with pigments to form complexes which are inserted in the thylakoid membrane of the chloroplast. The high similarity in the chemical and physical properties of the members of the family, together with the fact that they can easily lose pigments during isolation, makes their purification in a native state challenging. An alternative approach to obtain homogeneous preparations of LHCs was developed by Plumley and Schmidt in 19871, who showed that it was possible to reconstitute these complexes in vitro starting from purified pigments and unfolded apoproteins, resulting in complexes with properties very similar to that of native complexes. This opened the way to the use of bacterial expressed recombinant proteins for in vitro reconstitution. The reconstitution method is powerful for various reasons: (1) pure preparations of individual complexes can be obtained, (2) pigment composition can be controlled to assess their contribution to structure and function, (3) recombinant proteins can be mutated to study the functional role of the individual residues (e.g., pigment binding sites) or protein domain (e.g., protein-protein interaction, folding). This method has been optimized in several laboratories and applied to most of the light-harvesting complexes. The protocol described here details the method of reconstituting light-harvesting complexes in vitro currently used in our laboratory, and examples describing applications of the method are provided.

In Vitro Reconstitution of Light-harvesting Complexes of Plants and Green Algae

This protocol details the reconstitution of light-harvesting complexes in vitro. These integral membrane proteins coordinate chlorophylls and carotenoids and are responsible for harvesting light in higher plants and green algae.

Bitkiler ve Yeşil Alg Işık hasat Kompleksleri İn Vitro Sulandırma içinde

In plants and green algae, light is captured by the light-harvesting complexes (LHCs), a family of integral membrane proteins that coordinate chlorophylls ...

Functional Reconstitution and Channel Activity Measurements of Purified Wildtype and Mutant CFTR Protein

The Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) is a unique channel-forming member of the ATP Binding Cassette (ABC) superfamily of transporters. The phosphorylation and nucleotide dependent chloride channel activity of CFTR has been frequently studied in whole cell systems and as single channels in excised membrane patches. Many Cystic Fibrosis-causing mutations have been shown to alter this activity. While a small number of purification protocols have been published, a fast reconstitution method that retains channel activity and a suitable method for studying population channel activity in a purified system have been lacking. Here rapid methods are described for purification and functional reconstitution of the full-length CFTR protein into proteoliposomes of defined lipid composition that retains activity as a regulated halide channel. This reconstitution method together with a novel flux-based assay of channel activity is a suitable system for studying the population channel properties of wild type CFTR and the disease-causing mutants F508del- and G551D-CFTR. Specifically, the method has utility in studying the direct effects of phosphorylation, nucleotides and small molecules such as potentiators and inhibitors on CFTR channel activity. The methods are also amenable to the study of other membrane channels/transporters for anionic substrates.

Described here is a rapid and effective procedure for functional reconstitution of purified wild-type and mutant CFTR protein that preserves activity for this chloride channel, which is defective in Cystic Fibrosis. Iodide efflux from reconstituted proteoliposomes mediated by CFTR allows studies of channel activity and the effects of small molecules.