Name: constant pressure-controlled extrusion method for the preparation of nano-sized lipid vesicles
Uploaded: 2012-06-22T13:00:00
Description: Watch this Scientific Journal Video about Constant Pressure-controlled Extrusion Method for the Preparation of Nano-sized Lipid Vesicles at JoVE.com

وأيد هذا العمل من قبل معهد هوارد هيوز الطبي (HHMI) التعاونية جائزة الابتكار. وأيد LAM بواسطة الإشارات الخلوية وتنظيم المعهد الوطني للصحة تدريب منحة (T32 GM008759) وروث المعاهد الوطنية للصحة L. كيرشتاين ما قبل الدكتوراه زميل (CA165349-01). نود أن نشكر الأستاذ الدكتور مايكل Stowell (CU بولدر)، والبروفيسور ريس دوغلاس وروب البروفيسور فيليبس (كالتك) للتعليق عليها لا تقدر بثمن.

1. الحويصلية التحضير <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> استرداد زجاج مل 20 قارورة مع غطاء تفلون مبطنة. </li><li style=";text-align:right;direction:rtl"> تنظيف الأواني الزجاجية وجميع المحاقن مع الكلوروفورم قبل استخدامها لمنع التلوث. </li><li style=";text-align:right;direction:rtl"> نقل 100 ميكرولتر ?...

<ol>
	<li>Connor, J., Bucana, C., Fidler, I. J., Schroit, A. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Differentiation-dependent+expression+of+phosphatidylserine+in+mammalian+plasma+membranes:+quantitative+assessment+of+outer-leaflet+lipid+by+prothrombinase+complex+formation.">Differentiation-dependent expression of phosphatidylserine in mammalian plasma membranes: quantitative assessment of outer-leaflet lipid by prothrombinase complex formation.</a> Proc. Natl. Acad. Sci. U.S.A. 86, 3184-3188 (1989).</li><li>Smith, S. A., Morrissey, 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=Rapid+and+efficient+incorporation+of+tissue+factor+into+liposomes.">Rapid and efficient incorporation of tissue factor into liposomes.</a> J. Thromb. Haemost. 2, 1155-1162 (2004).</li><li>Hui, E., Johnson, C. 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J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Extrusion+technique+to+generate+liposomes+of+defined+size.">Extrusion technique to generate liposomes of defined size.</a> Methods Enzymol. 367, 3-14 (2003).</li><li>Gruner, S. M., Cullis, P. R., Hope, M. J., Tilcock, C. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Lipid+polymorphism:+the+molecular+basis+of+nonbilayer+phases.">Lipid polymorphism: the molecular basis of nonbilayer phases.</a> Annu. Rev. Biophys. Biophys. Chem. 14, 211-238 (1985).</li><li>Guven, A., Ortiz, M., Constanti, M., O'Sullivan, C. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Rapid+and+efficient+method+for+the+size+separation+of+homogeneous+fluorescein-encapsulating+liposomes.">Rapid and efficient method for the size separation of homogeneous fluorescein-encapsulating liposomes.</a> J. Liposome. Res. 19, 148-154 (2009).</li><li>Zimmerberg, J., Kozlov, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=How+proteins+produce+cellular+membrane+curvature.">How proteins produce cellular membrane curvature.</a> Nature Reviews Molecular Cell Biology. 7, 9-19 (2006).</li><li>Chonn, A., Cullis, P. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Recent+advances+in+liposomal+drug-delivery+systems.">Recent advances in liposomal drug-delivery systems.</a> Curr. Opin. Biotechnol. 6, 698-708 (1995).</li><li>Mayer, L. D., Hope, M. J., Cullis, P. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Vesicles+of+variable+sizes+produced+by+a+rapid+extrusion+procedure.">Vesicles of variable sizes produced by a rapid extrusion procedure.</a> Biochim. Biophys. 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باستخدام Liposofast Avestin LF-50 الطارد، أثبتنا كيف صغيرة الحجم، يتم إعداد الليبوزومات الاصطناعية من خلال نظام الضغط التي تسيطر عليها. من المهم أن نلاحظ أن الحويصلات الصفاحات تشكل عفويا بعد ترطيب الحويصلية، مما قد يؤدي إلى إنتاج أصغر النانوية. وهذه الحويصلات الصغيرة الصفاحا?...

<table border="1" style=";text-align:right;direction:rtl"><tbody><tr><td> اسم كاشف </td><td> شركة </td><td> فهرس العدد </td><td> تعليقات </td></tr><tr><td> الكلوروفورم </td><td> سيغما الدريخ </td><td> 02432-25ML </td><td> 95٪ مثبتات </td></tr><tr><td> الدرجة العالية للميثانول </td><td> سيغما الدريخ </td><td> 179337-4L </td><td></td></tr><tr><td> Liposofast LF-50 الطارد </td><td> Avestin، المؤتمر الوطني العراقي. </td><td></td><td></td></tr><tr><td> الفوسفورية </td><td> الدهون أفانتي القطبية </td><td></td><td></td></tr><tr><td> المسامات البولي </td><td> Avestin، المؤتمر الوطني العراقي. </td><td></td><td> قطره 25 ملم </td></tr><tr><td> استنزاف أقراص PE </td><td> Avestin، المؤتمر الوطني العراقي. </td><td> 230600 </td><td> قطره 25 ملم </td></tr></tbody></table>

constant pressure-controlled extrusion method for the preparation of nano-sized lipid vesicles

Liposomes are artificially prepared vesicles consisting of natural and synthetic phospholipids that are widely used as a cell membrane mimicking platform to study protein-protein and protein-lipid interactions3, monitor drug delivery4,5, and encapsulation4. Phospholipids naturally create curved lipid bilayers, distinguishing itself from a micelle.6 Liposomes are traditionally classified by size and number of bilayers, i.e. large unilamellar vesicles (LUVs), small unilamellar vesicles (SUVs) and multilamellar vesicles (MLVs)7. In particular, the preparation of homogeneous liposomes of various sizes is important for studying membrane curvature that plays a vital role in cell signaling, endo- and exocytosis, membrane fusion, and protein trafficking8. Several groups analyze how proteins are used to modulate processes that involve membrane curvature and thus prepare liposomes of diameters &lt;100 - 400 nm to study their behavior on cell functions3. Others focus on liposome-drug encapsulation, studying liposomes as vehicles to carry and deliver a drug of interest9. Drug encapsulation can be achieved as reported during liposome formation9. Our extrusion step should not affect the encapsulated drug for two reasons, i.e. (1) drug encapsulation should be achieved prior to this step and (2) liposomes should retain their natural biophysical stability, securely carrying the drug in the aqueous core. These research goals further suggest the need for an optimized method to design stable sub-micron lipid vesicles.
Nonetheless, the current liposome preparation technologies (sonication10, freeze-and-thaw10, sedimentation) do not allow preparation of liposomes with highly curved surface (i.e. diameter &lt;100 nm) with high consistency and efficiency10,5, which limits the biophysical studies of an emerging field of membrane curvature sensing. Herein, we present a robust preparation method for a variety of biologically relevant liposomes.
Manual extrusion using gas-tight syringes and polycarbonate membranes10,5 is a common practice but heterogeneity is often observed when using pore sizes &lt;100 nm due to due to variability of manual pressure applied. We employed a constant pressure-controlled extrusion apparatus to prepare synthetic liposomes whose diameters range between 30 and 400 nm. Dynamic light scattering (DLS)10, electron microscopy11 and nanoparticle tracking analysis (NTA)12 were used to quantify the liposome sizes as described in our protocol, with commercial polystyrene (PS) beads used as a calibration standard. A near linear correlation was observed between the employed pore sizes and the experimentally determined liposomes, indicating high fidelity of our pressure-controlled liposome preparation method. Further, we have shown that this lipid vesicle preparation method is generally applicable, independent of various liposome sizes. Lastly, we have also demonstrated in a time course study that these prepared liposomes were stable for up to 16 hours. A representative nano-sized liposome preparation protocol is demonstrated below.

Watch this Scientific Journal Video about Constant Pressure-controlled Extrusion Method for the Preparation of Nano-sized Lipid Vesicles at JoVE.com

Constant Pressure-controlled Extrusion Method for the Preparation of Nano-sized Lipid Vesicles

يصف هذا بروتوكول طريقة قذف لإعداد الحويصلات الدهون من دون ميكرون الأحجام مع وجود درجة عالية من التجانس. هذا الأسلوب يستخدم نظام الضغط التي تسيطر عليها مع تسيطر عليها معدلات تدفق النيتروجين لإعداد الحويصلية. ودهن إعداد<sup&gt; 1،2</sup&gt;، سيتم تقديم قذف الحويصلية، وتوصيف حجم هنا.

ثابت الطريقة النتوء الضغط التي تسيطر عليها لإعداد الحويصلات الدهن نانو الحجم

Liposomes are artificially prepared vesicles consisting of natural and synthetic phospholipids that are widely used as a cell membrane mimicking platform ...

Research

JoVE Journal

Bioengineering

Improved Method for the Preparation of a Human Cell-based, Contact Model of the Blood-Brain Barrier

تحسين طريقة لإعداد القائم على الخليوي، الاتصال نموذج الإنسان من حاجز الدم في الدماغ

The blood-brain barrier (BBB) comprises impermeable but adaptable brain capillaries which tightly control the brain environment. Failure of the BBB has ...

An Improved Method for the Preparation of Type I Collagen From Skin

طريقة محسنة لإعداد النوع الأول الكولاجين من الجلد

Soluble type 1 collagen (COL1) is used extensively as an adhesive substrate for cell cultures and as a cellular scaffold for regenerative applications. ...

The Encapsulation of Cell-free Transcription and Translation Machinery in Vesicles for the Construction of Cellular Mimics

وتغليف من النسخ خالية من الخلايا وآلات الترجمة في الحويصلات لتشييد المقلدون الخلوية

As interest shifts from individual molecules to systems of molecules, an increasing number of laboratories have sought to build from the bottom up ...

Lipid Bilayer Vesicle Generation Using Microfluidic Jetting

الدهون طبقة ثنائية الحويصلة انشاء طريق ميكروفلويديك النفث

Bottom-up synthetic biology presents a novel approach for investigating and reconstituting biochemical systems and, potentially, minimal organisms. This ...

Preparation of Mica Supported Lipid Bilayers for High Resolution Optical Microscopy Imaging

إعداد ميكا المدعومة الدهون طبقات ثنائية لارتفاع القرار المجهر الضوئي التصوير

Supported lipid bilayers (SLBs) are widely used as a model for studying membrane properties (phase separation, clustering, dynamics) and its interaction ...

Biomembrane Fabrication by the Solvent-assisted Lipid Bilayer (SALB) Method

Biomembrane Fabrication by the Solvent-assisted Lipid Bilayer SALB Method

غشاء حيوي تلفيق من المذيبات بمساعدة الدهون طبقة ثنائية (SALB) طريقة

In order to mimic cell membranes, the supported lipid bilayer (SLB) is an attractive platform which enables in vitro investigation of membrane-related ...

Solid Lipid Nanoparticles (SLNs) for Intracellular Targeting Applications

Solid Lipid Nanoparticles SLNs for Intracellular Targeting Applications

الصلبة الدهون النانوية (SLNs) لاستهداف التطبيقات بين الخلايا

Nanoparticle-based delivery vehicles have shown great promise for intracellular targeting applications, providing a mechanism to specifically alter ...

Film Extrusion of Crambe abyssinica/Wheat Gluten Blends

Film Extrusion of Crambe abyssinica/Wheat Gluten Blends

فيلم بثق<em&gt; كرنب abyssinica</em&gt; / القمح الغلوتين الأخلاط

Crambe abyssinica is a plant with potential for use in industrial (non-food) plant oil production. The side stream from this oil production is a ...

Evaluation of the Storage Stability of Extracellular Vesicles

تقييم استقرار التخزين من الحويصلات خارج الخلية

Extracellular vesicles (EVs) are promising targets in current research, to be used as drugs, drug-carriers, and biomarkers. For their clinical ...

Simultaneous Quantification of Selected Kynurenines Analyzed by Liquid Chromatography-Mass Spectrometry in Medium Collected from Cancer Cell Cultures

القياس الكمي المتزامن لـ Kynurenines المختارة التي تم تحليلها بواسطة الكروماتوغرافيا السائلة- القياس الطيفي الكتلي في المتوسط الذي تم جمعه من ثقافات الخلايا السرطانية

The kynurenine pathway and the tryptophan catabolites called kynurenines have received increased attention for their involvement in immune regulation and ...