この作品は、それぞれ &quot;ブラックウィドウスパイダーシルクとスパイダー接着剤シルクの力学的挙動の分子特性&quot;と題されたNSF RUI助成MCB-0950372およびDMR-1105310によってサポートされていました。

<ol>
	<li>Gosline, J. M., Guerette, P. A., Ortlepp, C. S., Savage, K. N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+mechanical+design+of+spider+silks:+from+fibroin+sequence+to+mechanical+function.">The mechanical design of spider silks: from fibroin sequence to mechanical function.</a> J. Exp. Biol. 202, 3295-3303 (1999).</li><li>Foelix, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Biology of spiders. , (1996).</li><li>Vollrath, F., Knight, D. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Liquid+crystalline+spinning+of+spider+silk.">Liquid crystalline spinning of spider silk.</a> Nature. 410, 541-548 (2001).</li><li>Spiess, K., Lammel, A., Scheibel, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Recombinant+spider+silk+proteins+for+applications+in+biomaterials.">Recombinant spider silk proteins for applications in biomaterials.</a> Macromol. Biosci. 10, 998-1007 (2010).</li><li>Stark, M., Grip, S., Rising, A., Hedhammar, M., Engstrom, W., Hjalm, G., Johansson, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Macroscopic+fibers+self-assembled+from+recombinant+miniature+spider+silk+proteins.">Macroscopic fibers self-assembled from recombinant miniature spider silk proteins.</a> Biomacromolecules. 8, 1695-1701 (2007).</li><li>Lazaris, A., Huang, Y., Zhou, J. F., Duguay, F., Chretien, N., Welsh, E. A., Soares, J. W., Karatzas, C. N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Spider+Silk+Fibers+Spun+from+Soluble+Recombinant+Silk+Produced+in+Mammalian+Cells.">Spider Silk Fibers Spun from Soluble Recombinant Silk Produced in Mammalian Cells.</a> Science. 295, 472-476 (2002).</li><li>Teule, F., Cooper, A. R., Furin, W. A., Bittencourt, D., Rech, E. L., Brooks, A., Lewis, R. V. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+protocol+for+the+production+of+recombinant+spider+silk-like+proteins+for+artificial+fiber+spinning.">A protocol for the production of recombinant spider silk-like proteins for artificial fiber spinning.</a> Nat. Protoc. 4, 341-355 (2009).</li><li>Gnesa, E., Hsia, Y., Yarger, J. L., Weber, W., Lin-Cereghino, J., Lin-Cereghino, G., Tang, S., Agari, K., Vierra, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Conserved+C-Terminal+Domain+of+Spider+Tubuliform+Spidroin+1+Contributes+to+Extensibility+in+Synthetic+Fibers.">Conserved C-Terminal Domain of Spider Tubuliform Spidroin 1 Contributes to Extensibility in Synthetic Fibers.</a> Biomacromolecules. , (2011).</li><li>Hayashi, C. Y., Shipley, N. H., Lewis, R. V. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Hypotheses+that+correlate+the+sequence,+structure,+and+mechanical+properties+of+spider+silk+proteins.">Hypotheses that correlate the sequence, structure, and mechanical properties of spider silk proteins.</a> Int. J. Biol. Macromol. 24, 271-275 (1999).</li><li>Xu, M., Lewis, R. V. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Structure+of+a+protein+superfiber:+Spider+Dragline+Silk.">Structure of a protein superfiber: Spider Dragline Silk.</a> Proc. Natl. Acad. Sci. 87, 7120-7124 (1990).</li><li>Hayashi, C. Y., Blackledge, T. A., Lewis, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Molecular+and+mechanical+characterization+of+aciniform+silk:+uniformity+of+iterated+sequence+modules+in+a+novel+member+of+the+spider+silk+fibroin+gene+family.">Molecular and mechanical characterization of aciniform silk: uniformity of iterated sequence modules in a novel member of the spider silk fibroin gene family.</a> Mol. Biol. Evol. 21, 1950-1959 (2004).</li><li>Lazaris, A., Arcidiacono, S., Huang, Y., Zhou, J. F., Duguay, F., Chretien, N., Welsh, E. A., Soares, J. W., Karatzas, C. N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Spider+silk+fibers+spun+from+soluble+recombinant+silk+produced+in+mammalian+cells.">Spider silk fibers spun from soluble recombinant silk produced in mammalian cells.</a> Science. 295, 472-476 (2002).</li><li>Arcidiacono, S., Mello, C., Kaplan, D., Cheley, S., Bayley, H. <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+characterization+of+recombinant+spider+silk+expressed+in+Escherichia+coli.">Purification and characterization of recombinant spider silk expressed in Escherichia coli.</a> Appl. Microbiol. Biotechnol. 49, 31-38 (1998).</li><li>Menassa, R., Zhu, H., Karatzas, C. N., Lazaris, A., Richman, A., Brandle, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Spider+dragline+silk+proteins+in+transgenic+tobacco+leaves:+accumulation+and+field+production.">Spider dragline silk proteins in transgenic tobacco leaves: accumulation and field production.</a> Plant Biotechnology Journal. 2, 431-438 (2004).</li><li>Scheller, J., Guhrs, K. H., Grosse, F., Conrad, U. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Production+of+spider+silk+proteins+in+tobacco+and+potato.">Production of spider silk proteins in tobacco and potato.</a> Nat. Biotechnol. 19, 573-577 (2001).</li><li>An, B., Hinman, M. B., Holland, G. P., Yarger, J. L., Lewis, R. V. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Inducing+beta-sheets+formation+in+synthetic+spider+silk+fibers+by+aqueous+post-spin+stretching.">Inducing beta-sheets formation in synthetic spider silk fibers by aqueous post-spin stretching.</a> Biomacromolecules. 12, 2375-2381 (2011).</li><li>Elices, M., Guinea, G. V., Plaza, G. R., Karatzas, C., Riekel, C., Agullo-Rueda, F., Daza, R., Perez-Rigueiro, 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> Bioinspired Fibers Follow the Track of Natural Spider Silk. Macromolecules. 44, 1166-1176 (2011).</li><li>Scheller, J., Guhrs, K. H., Grosse, F., Conrad, U. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Production+of+spider+silk+proteins+in+tobacco+and+potato.">Production of spider silk proteins in tobacco and potato.</a> Nature Biotechnology. 19, (2001).</li><li>Kojic, N., Kojic, M., Gudlavalleti, S., McKinley, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Solvent+removal+during+synthetic+and+Nephila+fiber+spinning.">Solvent removal during synthetic and Nephila fiber spinning.</a> Biomacromolecules. 5, 1698-1707 (2004).</li><li>Jeffery, F., La Mattina, C., Tuton-Blasingame, T., Hsia, Y., Gnesa, E., Zhao, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Microdissection+of+Black+Widow+Spider+Silk-producing+Glands.">Microdissection of Black Widow Spider Silk-producing Glands.</a> J. Vis. Exp. (47), e2382 (2011).</li><li>Blasingame, E., Tuton-Blasingame, T., Larkin, L., Falick, A. M., Zhao, L., Fong, J., Vaidyanathan, V., Visperas, A., Geurts, P., Hu, X., La Mattina, C., Vierra, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Pyriform+spidroin+1,+a+novel+member+of+the+silk+gene+family+that+anchors+dragline+silk+fibers+in+attachment+discs+of+the+black+widow+spider,+Latrodectus+hesperus.">Pyriform spidroin 1, a novel member of the silk gene family that anchors dragline silk fibers in attachment discs of the black widow spider, Latrodectus hesperus.</a> J. Biol. Chem. 284, 29097-29108 (2009).</li><li>La Mattina, C., Reza, R., Hu, X., Falick, A. M., Vasanthavada, K., McNary, S., Yee, R., Vierra, C. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Spider+minor+ampullate+silk+proteins+are+constituents+of+prey+wrapping+silk+in+the+cob+weaver+Latrodectus+hesperus.">Spider minor ampullate silk proteins are constituents of prey wrapping silk in the cob weaver Latrodectus hesperus.</a> Biochemistry. 47, 4692-4700 (2008).</li><li>Hsia, Y., Gnesa, E., Jeffery, F., Tang, S., Vierra, C., Cuppoletti, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Spider+Silk+Composites+and+Applications.">Spider Silk Composites and Applications.</a> Metal, Ceramic and Polymeric Composites for Various Uses. 2, 303-324 (2011).</li></ol>

利害の衝突が宣言されません。

この方法論をつむいだ糸合成繊維は天然繊維に比べて機械的に同じ大きさのオーダーである。スプーリングとポストスピンドロープロセスを機械化によるヒューマンエラーの量を減少させることによって、サンプル間の実験的な変動は、より制御されており、大幅に減少しました。 私たちの方法論は、クモの遺伝子ファミリーの他のメンバーのcDNAからエンコードされた?...

クモの糸が出高張力鋼、ケブラーとナイロンを含むいくつかの人工材料を、実行する特別な機械的特性を持っています。1スパイダーは、多様な機械的特性を表示し、少なくとも6月7日の異なる繊維の種類、引張強さと拡張性の様々な量で設計をそれぞれスピン特定の生物学的なタスクを実行することができます。2研究の科学者が急速にために共食いの3,4。ので、その優れた機械的性質、それらの生体適合性、およびそれらの非毒性と緑の材料の性質の次世代バイオマテリアルとしてのクモの糸を使用して追求され、農業を通してクモの糸を収穫クモの毒の性質は、工業規模の製造のために必要な需要を満たすための実践的な戦略ではありません。したがって、科学者たちは、から合成繊維の紡糸をin vitroで組み合わせるトランスジェニック生物における組換え絹タンパク質の生産になっているSE精製したタンパク質。フルレングスの組換えクモの糸タンパク質の5-8表現が彼らの非常に反復的な性質と物理的な長さ（&gt; 15キロバイト）、GC-リッチコンテンツとバイアスを含むそれらの遺伝子配列の固有の性質与えられた技術的に困難であったアラニンとグリシンのコドン使用。現在までに9-11、ほとんどのラボは、部分的なcDNA配列または合成遺伝子を用いて主要なampullate糸タンパク質MaSp1またはMaSp2の切り捨てられた形を表現に焦点を当てている。12月15日スピニング合成クモの絹が必要とする困難なプロセスです。いくつかの科学分野、および紡糸プロセスの複雑さの習得と知識が完全に映像表現で一般大衆に明らかにされていない。実際には、世界中のラボのほんの一握りでは、クモの糸のcDNAを発現する絹タンパク質を精製、合成繊維を回転させ、ポストスピンドローを実行するための専門知識を持っているし、最後にそれらの生体材料の特性をテストします。 図8に示すように、紡績の合成繊維の16,17異なるアプローチは、湿式と乾式紡糸などエレクトロの方法を包含している16,18,19すべての手順は、一般的な1つの目標がある-機械的性質と合成クモの糸を生成するプロトコルの開発をそのライバル、自然のスレッド大規模な商業的な製造プロセスのために。 ここでは、湿式紡糸方法を用いて実験室規模で人工的なクモの糸を生成する手順を説明します。他の紡績方法と比較して、湿式紡糸は、繊維分析のための最も一貫した結果を生み出しています。私たちは彼らの精製に続いて​​細菌における組換え絹タンパク質の発現と、この手順の開始を概説し、その後でスレッドを生成する &quot;などの紡糸&quot;繊維に適用後のスピンドローの方法論を含めて、紡績のためのタンパク質の準備手順について説明します。天然のクモの糸の品質に近づく材料特性。私たちのmethodologyは密接に絹繊維の自然な紡糸プロセスを模倣し、それがオーブとCOB-織りスパイダーから絹生産腺のアーキテクチャおよび機能の専門知識に大きく描画するよう設計されています20から22はまた、我々が必要と結論研究者は究極の強さ、究極​​の歪み、繊維の靭性を計算できるように応力 - ひずみ曲線をプロットする張力計を用いた合成繊維の材料特性を決定するための手順を実行します。最後に、しかし重要な価値が、紡績スプール、および描画装置は、かなり手の込んだ、高価なカスタマイズされた機器を購入するより、市販の部品を使用して、自宅に構築することができます。

<table border="1"><tbody><tr><td> 試薬/機器 </td><td> 会社 </td><td> カタログ番号 </td><td> コメント </td></tr><tr><td>のpBAD / TOPO ThioFusion発現キット</td><td>インビトロジェン</td><td> K370-01 </td><td></td></tr><tr><td> 10倍FastBreakのCell Lysis試薬、 </td><td>プロメガ</td><td> V857C </td><td></td></tr><tr><td> Ni-NTAアガロース</td><td>キアゲン</td><td> 30210 </td><td>バッファの手順が含まれています</td></tr><tr><td> ProteoSilverシルバーステインキット</td><td> Sigma-Aldrich社</td><td> PROTSIL1-1KT </td><td></td></tr><tr><td>フリーゾーン凍結乾燥機</td><td> Labconco </td><td> 7960041 </td><td>フリーゾーン12Plus </td></tr><tr><td>ヘキサフルオロイソプロパノール（HFIP） </td><td> Sigma-Aldrich社</td><td> 52512 </td><td></td></tr><tr><td>注射器</TD&gt; <td>ハミルトン</td><td> 7657から01 </td><td> 250μL </td></tr><tr><td>針</td><td>ハミルトン</td><td> 7780から01 </td><td> 26Sゲージ、ブラントエンドニードル</td></tr><tr><td>注射器ポンプ</td><td>ハーバード装置</td><td> 702208 </td><td> 11Plus </td></tr><tr><td>デジタルノギス</td><td>カレラ</td><td> CP5906 </td><td> 0〜150ミリメートルの範囲</td></tr><tr><td>ステンレス製の鉗子</td><td>世界の精密機器</td><td> 501764 </td><td>ミニデュモン＃M5S </td></tr><tr><td>モーター</td><td>自然ミル</td><td> 7090529 </td><td> 12VDC、2つの回転速度</td></tr><tr><td>リニアアクチュエータ</td><td>ワーナー電気</td><td> 01-D024-0050-A06-LP-IP65 </td><td> 24VDC、6インチの範囲</td></tr><tr><td>解剖顕微鏡</td><td>ライカマイクロシステムズ</td><td>ライカMZ16 </td><td></td></tr><tr><td>デジタルmicroscOPE、光エレクトロニクスカメラ</td><td>ライカマイクロシステムズ</td><td> DFC320 </td><td>ソフトウェア：ライカアプリケーションスイートv2.8.1 </td></tr><tr><td> Vannasはさみ</td><td>世界の精密機器</td><td> 500260 </td><td></td></tr><tr><td> Microtensometer </td><td>オーロラの科学</td><td> 310C </td><td> 5Nデュアルモードシステム</td></tr></tbody></table>

synthetic spider silk production on a laboratory scale

社会が進行するとリソースがscarcerになるにつれ、それは、高性能特性を持つエンジニアの次世代バイオマテリアル、新しい技術を開拓するためにますます重要になっています。これらの新しい構造材料の開発は、コスト効率の高い、迅速で、処理の方法論と環境に優しい持続可能な製品を含んでいる必要があります。スパイダーはライバル最高の人工と天然素材というバイオミミクリーのために次世代のエンジニアリング材料の豊富なソースを提供し、多様な機械的性質の異なる繊維の種類の多数のスピン。天然のクモの糸の大量のコレクションが現実的ではありませんので、合成絹の生産は、スレッドの無制限の供給へのアクセス権を持つ科学者を提供する能力を持っています。紡糸工程の合理化と完成することができますそのため、人工のクモの繊維がボディアーマーに至るまで幅広いアプリケーションに、縫合糸のための潜在的な用途を持っているS、綱及びケーブル、タイヤ、楽器用文字列、および航空宇宙技術の複合体。合成絹の生産工程を進めるために、スピン、スピンからその材料の特性で、低分散を表示する繊維を得るために、我々は、細菌、精製やタンパク質の濃度の組換えクモの糸タンパク質の発現を統合し、湿式紡糸プロトコルを開発しました、繊維の押出及び機械的なポスト·スピン治療が続く。これは、実験室規模での人工絹の繊維をスピンし、分析するステップ·バイ·ステップのプロセスを明らかにする最初の視覚的に表現したものです。また、同じ紡糸をつむいだ糸繊維間のばらつきの発生を最小限に抑えるため、詳細情報を提供します。総称して、これらの方法は、天然のクモの糸を凌駕する高品質の繊維につながって、人工絹の生産のプロセスを推進します。

Watch this Scientific Journal Video about Synthetic Spider Silk Production on a Laboratory Scale at JoVE.com

Synthetic Spider Silk Production on a Laboratory Scale

クモの糸の傑出した機械的および生化学的特性にもかかわらず、この材料は、従来の手段によって大量にで収穫されたすることはできません。ここで我々は次世代の生体材料としてクモの糸生産とその使用方法を勉強し調査官するための重要なプロセスである人工的なクモの糸繊維をスピンするための効率的なの戦略を、について説明します。

実験室規模の合成クモの糸生産

As society progresses and resources become scarcer, it is becoming increasingly important to cultivate new technologies that engineer next generation ...

synthetic-spider-silk-production-on-a-laboratory-scale

Research

JoVE Journal

Bioengineering

26.6K ビュー.  University of the Pacific. クモの糸の傑出した機械的および生化学的特性にもかかわらず、この材料は、従来の手段によって大量にで収穫されたすることはできません。ここで我々は次世代の生体材料としてクモの糸生産とその使用方法を勉強し調査官するための重要なプロセスである人工的なクモの糸繊維をスピンするための効率的なの戦略を、について説明します。

ビデオ: Synthetic Spider Silk Production on a Laboratory Scale

Air Filter Devices Including Nonwoven Meshes of Electrospun Recombinant Spider Silk Proteins

Based on the natural sequence of Araneus diadematus Fibroin 4 (ADF4), the recombinant spider silk protein eADF4(C16) has been engineered. This highly repetitive protein has a molecular weight of 48kDa and is soluble in different solvents (hexafluoroisopropanol (HFIP), formic acid and aqueous buffers). eADF4(C16) provides a high potential for various technical applications when processed into morphologies such as films, capsules, particles, hydrogels, coatings, fibers and nonwoven meshes. Due to their chemical stability and controlled morphology, the latter can be used to improve filter materials. In this protocol, we present a procedure to enhance the efficiency of different air filter devices, by deposition of nonwoven meshes of electrospun recombinant spider silk proteins. Electrospinning of eADF4(C16) dissolved in HFIP results in smooth fibers. Variation of the protein concentration (5-25% w/v) results in different fiber diameters (80-1,100 nm) and thus pore sizes of the nonwoven mesh.
Post-treatment of eADF4(C16) electrospun from HFIP is necessary since the protein displays a predominantly &alpha;-helical secondary structure in freshly spun fibers, and therefore the fibers are water soluble. Subsequent treatment with ethanol vapor induces formation of water resistant, stable &beta;-sheet structures, preserving the morphology of the silk fibers and meshes. Secondary structure analysis was performed using Fourier transform infrared spectroscopy (FTIR) and subsequent Fourier self-deconvolution (FSD).
The primary goal was to improve the filter efficiency of existing filter substrates by adding silk nonwoven layers on top. To evaluate the influence of electrospinning duration and thus nonwoven layer thickness on the filter efficiency, we performed air permeability tests in combination with particle deposition measurements. The experiments were carried out according to standard protocols.

Spider silk fibers display extraordinary mechanical properties. Engineered Araneus diadematus Fibroin 4 (eADF4) can be processed into nonwoven meshes using electrospinning. Here, the eADF4 nonwoven meshes are used to improve the performance of air filtering devices.

エレクトロ組換えスパイダーシルクタンパク質の不織布メッシュを含むエアフィルターデバイス

Based on the natural sequence of Araneus diadematus Fibroin 4 (ADF4), the recombinant spider silk protein eADF4(C16) has been engineered. This highly ...

生物工学

Designing Silk-silk Protein Alloy Materials for Biomedical Applications

Fibrous proteins display different sequences and structures that have been used for various applications in biomedical fields such as biosensors, nanomedicine, tissue regeneration, and drug delivery. Designing materials based on the molecular-scale interactions between these proteins will help generate new multifunctional protein alloy biomaterials with tunable properties. Such alloy material systems also provide advantages in comparison to traditional synthetic polymers due to the materials biodegradability, biocompatibility, and tenability in the body. This article used the protein blends of wild tussah silk (Antheraea pernyi) and domestic mulberry silk (Bombyx mori) as an example to provide useful protocols regarding these topics, including how to predict protein-protein interactions by computational methods, how to produce protein alloy solutions, how to verify alloy systems by thermal analysis, and how to fabricate variable alloy materials including optical materials with diffraction gratings, electric materials with circuits coatings, and pharmaceutical materials for drug release and delivery. These methods can provide important information for designing the next generation multifunctional biomaterials based on different protein alloys.

Blending is an efficient approach to generate biomaterials with a broad range of properties and combined features. By predicting the molecular interactions between different natural silk proteins, new silk-silk protein alloy platforms with tunable mechanical resiliency, electrical response, optical transparency, chemical processability, biodegradability, or thermal stability can be designed.

バイオメディカル応用のためのシルクシルクプロテイン合金材料設計

Fibrous proteins display different sequences and structures that have been used for various applications in biomedical fields such as biosensors, ...

Production and Targeting of Monovalent Quantum Dots

The multivalent nature of commercial quantum dots (QDs) and the difficulties associated with producing monovalent dots have limited their applications in biology, where clustering and the spatial organization of biomolecules is often the object of study. We describe here a protocol to produce monovalent quantum dots (mQDs) that can be accomplished in most biological research laboratories via a simple mixing of CdSe/ZnS core/shell QDs with phosphorothioate DNA (ptDNA) of defined length. After a single ptDNA strand has wrapped the QD, additional strands are excluded from the surface. Production of mQDs in this manner can be accomplished at small and large scale, with commercial reagents, and in minimal steps. These mQDs can be specifically directed to biological targets by hybridization to a complementary single stranded targeting DNA. We demonstrate the use of these mQDs as imaging probes by labeling SNAP-tagged Notch receptors on live mammalian cells, targeted by mQDs bearing a benzylguanine moiety.

We provide detailed instructions for the preparation of monovalent targeted quantum dots (mQDs) from phosphorothioate DNA of defined length. DNA wrapping occurs in high yield, and therefore, products do not require purification. We demonstrate the use of the SNAP tag to target mQDs to cell-surface receptors for live-cell imaging applications.

生産と一価量子ドットの標的

The multivalent nature of commercial quantum dots (QDs) and the difficulties associated with producing monovalent dots have limited their applications in ...

Cloning and Large-Scale Production of High-Capacity Adenoviral Vectors Based on the Human Adenovirus Type 5

High-capacity adenoviral vectors (HCAdV) devoid of all viral coding sequences represent one of the most advanced gene delivery vectors due to their high packaging capacity (up to 35 kb), low immunogenicity, and low toxicity. However, for many laboratories the use of HCAdV is hampered by the complicated procedure for vector genome construction and virus production. Here, a detailed protocol for efficient cloning and production of HCAdV based on the plasmid pAdFTC containing the HCAdV genome is described. The construction of HCAdV genomes is based on a cloning vector system utilizing homing endonucleases (I-CeuI and PI-SceI). Any gene of interest of up to 14 kb can be subcloned into the shuttle vector pHM5, which contains a multiple cloning site flanked by I-CeuI and PI-SceI. After I-CeuI and PI-SceI-mediated release of the transgene from the shuttle vector the transgene can be inserted into the HCAdV cloning vector pAdFTC. Because of the large size of the pAdFTC plasmid and the long recognition sites of the used enzymes associated with strong DNA binding, careful handling of the cloning fragments is needed. For virus production, the HCAdV genome is released by NotI digest and transfected into a HEK293 based producer cell line stably expressing Cre recombinase. To provide all adenoviral genes for adenovirus amplification, co-infection with a helper virus containing a packing signal flanked by loxP sites is required. Pre-amplification of the vector is performed in producer cells grown on surfaces and large-scale amplification of the vector is conducted in spinner flasks with producer cells grown in suspension. For virus purification, two ultracentrifugation steps based on cesium chloride gradients are performed followed by dialysis. Here tips, tricks, and shortcuts developed over the past years working with this HCAdV vector system are presented.

A protocol for generation of high-capacity adenoviral vectors lacking all viral coding sequences is presented. Cloning of transgenes contained in the vector genome is based on homing endonucleases. Virus amplification in producer cells grown as adherent cells and in suspension relies on a helper virus providing viral genes in trans.

ヒトアデノウイルス5型に基づく高容量アデノウイルスベクターのクローニングおよび大規模生産

High-capacity adenoviral vectors (HCAdV) devoid of all viral coding sequences represent one of the most advanced gene delivery vectors due to their high ...

Engineered 3D Silk-collagen-based Model of Polarized Neural Tissue

Despite huge efforts to decipher the anatomy, composition and function of the brain, it remains the least understood organ of the human body. To gain a deeper comprehension of the neural system scientists aim to simplistically reconstruct the tissue by assembling it in vitro from basic building blocks using a tissue engineering approach. Our group developed a tissue-engineered silk and collagen-based 3D brain-like model resembling the white and gray matter of the cortex. The model consists of silk porous sponge, which is pre-seeded with rat brain-derived neurons, immersed in soft collagen matrix. Polarized neuronal outgrowth and network formation is observed with separate axonal and cell body localization. This compartmental architecture allows for the unique development of niches mimicking native neural tissue, thus enabling research on neuronal network assembly, axonal guidance, cell-cell and cell-matrix interactions and electrical functions.

Insight into the complex actions of the brain requires advanced research tools. Here we demonstrate a novel silk-collagen-based 3D engineered model of neural tissue resembling brain-like architecture. The model can be used to study neuronal network assembly, axonal guidance, cell-cell interactions and electrical activity.

偏神経組織のエンジニア3Dシルクコラーゲンベースモデル

Despite huge efforts to decipher the anatomy, composition and function of the brain, it remains the least understood organ of the human body. To gain a ...

Power Input Measurements in Stirred Bioreactors at Laboratory Scale

The power input in stirred bioreactors is an important scaling-up parameter and can be measured through the torque that acts on the impeller shaft during rotation. However, the experimental determination of the power input in small-scale vessels is still challenging due to relatively high friction losses inside typically used bushings, bearings and/or shaft seals and the accuracy of commercially available torque meters. Thus, only limited data for small-scale bioreactors, in particular single-use systems, is available in the literature, making comparisons among different single-use systems and their conventional counterparts difficult.
This manuscript provides a protocol on how to measure power inputs in benchtop scale bioreactors over a wide range of turbulence conditions, which can be described by the dimensionless Reynolds number (Re). The aforementioned friction losses are effectively reduced by the use of an air bearing. The procedure on how to set up, conduct and evaluate a torque-based power input measurement, with special focus on cell culture typical agitation conditions with low to moderate turbulence (100 &#60; Re &#60; 2&#183;104), is described in detail. The power input of several multi-use and single-use bioreactors is provided by the dimensionless power number (also called Newton number, P0), which is determined to be in the range of P0 &#8776; 0.3 and P0 &#8776; 4.5 for the maximum Reynolds numbers in the different bioreactors.

The power input in stirred bioreactors can be measured through the torque that acts on the impeller shaft during rotation. This manuscript describes how an air bearing can be used to effectively reduce friction losses observed in mechanical seals and improve the accuracy of power input measurements in small-scale vessels.

実験室規模で撹拌したバイオリアクターでのパワー入力測定

The power input in stirred bioreactors is an important scaling-up parameter and can be measured through the torque that acts on the impeller shaft during ...

Material Formation of Recombinant Spider Silks through Aqueous Solvation using Heat and Pressure

Many spiders produce seven types of silks. Six of the silks are fiber in form when produced by the spiders. These fibers are not water soluble. In order to reproduce the remarkable mechanical properties of spider silks, they must be produced in heterologous hosts as spiders are both territorial and cannibalistic. The synthetic analogs of spider silk also tend to be insoluble in aqueous solutions. Thus, a large percentage of research in recombinant spider silks rely upon organic solvents that are detrimental to large scale production of materials. Our group&#8217;s method forces the solvation of these recombinant spider silks into water. Remarkably, when these proteins are prepared using this method of heat and pressure, a wide range of material forms can be prepared from the same solution of recombinant spider silk proteins (rSSp) including: films, fibers, sponge, hydrogel, lyogel, and adhesives. This article demonstrates the production of the solvated rSSp and material forms in a manner that is more easily understood than from written materials and methods alone.

Here, we present a protocol to produce water soluble recombinant spider silk protein solutions and the material forms that can be formed from those solutions.

熱と圧力を用いた水性溶媒和による組み換えクモ絹の材料形成

Many spiders produce seven types of silks. Six of the silks are fiber in form when produced by the spiders. These fibers are not water soluble. In order ...

Large-Scale, Automated Production of Adipose-Derived Stem Cell Spheroids for 3D Bioprinting

Adipose-derived stromal/stem cells (ASCs) are a subpopulation of cells found in the stromal vascular fraction of human subcutaneous adipose tissue recognized as a classical source of mesenchymal stromal/stem cells. Many studies have been published with ASCs for scaffold-based tissue engineering approaches, which mainly explored the behavior of these cells after their seeding on bioactive scaffolds. However, scaffold-free approaches are emerging to engineer tissues in vitro and in vivo, mainly by using spheroids, to overcome the limitations of scaffold-based approaches.
Spheroids are 3D microtissues formed by the self-assembly process. They can better mimic the architecture and microenvironment of native tissues, mainly due to the magnification of cell-to-cell and cell-to-extracellular matrix interactions. Recently, spheroids are mainly being explored as disease models, drug screening studies, and building blocks for 3D bioprinting. However, for 3D bioprinting approaches, numerous spheroids, homogeneous in size and shape, are necessary to biofabricate complex tissue and organ models. In addition, when spheroids are produced automatically, there is little chance for microbiological contamination, increasing the reproducibility of the method.
The large-scale production of spheroids is considered the first mandatory step for developing a biofabrication line, which continues in the 3D bioprinting process and finishes in the full maturation of the tissue construct in bioreactors. However, the number of studies that explored the large-scale ASC spheroid production are still scarce, together with the number of studies that used ASC spheroids as building blocks for 3D bioprinting. Therefore, this article aims to show the large-scale production of ASC spheroids using a non-adhesive micromolded hydrogel technique spreading ASC spheroids as building blocks for 3D bioprinting approaches.

Here, we describe the large-scale production of adipose-derived stromal/stem cell (ASC) spheroids using an automated pipetting system to seed the cell suspension, thus ensuring homogeneity of spheroid size and shape. These ASC spheroids can be used as building blocks for 3D bioprinting approaches.

3Dバイオプリンティングのための脂肪由来幹細胞スフェロイドの大規模自動生産

Adipose-derived stromal/stem cells (ASCs) are a subpopulation of cells found in the stromal vascular fraction of human subcutaneous adipose tissue ...

溶解性マイクロキャリアに基づく接着細胞の閉鎖系作製

Large-Scale Cell Production Based on GMP-Grade Dissolvable Porous Microcarriers

Researchers in the cell and gene therapy (CGT) industry have long faced a formidable challenge in the efficient and large-scale expansion of cells. To address the primary shortcomings of the two-dimensional (2D) planar culturing system, we innovatively developed an automated closed industrial scale cell production (ACISCP) platform based on a GMP-grade, dissolvable, and porous microcarrier for the 3D culture of adherent cells, including human mesenchymal stem/stromal cells (hMSCs), HEK293T cells, and Vero cells. To achieve large-scale expansion, a two-stage expansion was conducted with 5 L and 15 L stirred-tank bioreactors to yield 1.1 x 1010 hMSCs with an overall 128-fold expansion within 9 days. The cells were harvested by completely dissolving the microcarriers, concentrated, washed and formulated with a continuous-flow centrifuge-based cell processing system, and then aliquoted with a cell filling system. Compared with 2D planar culture, there are no significant differences in the quality of hMSCs harvested from 3D culture. We have also applied these dissolvable porous microcarriers to other popular cell types in the CGT sector; specifically, HEK293T cells and Vero cells have been cultivated to peak cell densities of 1.68 x 107 cells/mL and 1.08 x 107 cells/mL, respectively. This study provides a protocol for using a bioprocess engineering platform harnessing the characteristics of GMP-grade dissolvable microcarriers and advanced closed equipment to achieve the industrial-scale manufacturing of adherent cells.

著者スポットライト:溶解性マイクロキャリアによる細胞治療製造の進歩 

Here, we present a protocol to achieve the large-scale manufacturing of adherent cells through a fully closed system based on GMP-grade dissolvable microcarriers. The cultivation of human mesenchymal stem cells, HEK293T cells, and Vero cells was validated and met both quantity demands and quality criteria for the cell and gene therapy industry.

GMPグレードの溶解性多孔質マイクロキャリアに基づく大規模セル生産

Researchers in the cell and gene therapy (CGT) industry have long faced a formidable challenge in the efficient and large-scale expansion of cells. To ...