JP6180440B2 - 植物細胞パックの発生及び培養のための方法 - Google Patents
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- C12N15/8241—Phenotypically and genetically modified plants via recombinant DNA technology
- C12N15/8242—Phenotypically and genetically modified plants via recombinant DNA technology with non-agronomic quality (output) traits, e.g. for industrial processing; Value added, non-agronomic traits
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Description
(i)例えば、関心のある非相同配列に操作的に連結したプロモーターを含む‘裸の’DNAの一過性発現;
(ii)発現ベクター、例えば複製ベクターからの発現。一般的に言うと、当業者は、良好に、ベクターを構築すること、及び一時的な組換え遺伝子発現のためのプロトコルを設定することができる。適したベクターを選択及び構築することができ、それらは、プロモーター配列、ターミネーター断片、ポリアデニル化配列、エンハンサー配列、マーカー遺伝子及び適宜他の配列を含む適した調節配列を含む。他の詳細について、例えばMolecular Cloning: a Laboratory Manual: 2nd edition, Sambrook et al, 1989, Cold Spring Harbor Laboratory Press or Current Protocols in Molecular Biology, Second Edition, Ausubel et al. eds . , John Wiley & Sons, 1992を参照する;
(iii)統合していないベクターからの発現;
(iv)提供されたT−DNAからの発現。
(i)細胞パックによって含まれる標的細胞中に、非相同タンパク質をコードするヌクレオチド配列を含有する第一の核酸を一時的に導入する工程、
(ii)一定時間、適した培養条件を提供することによって非相同タンパク質の核酸からの発現を生じる又は可能にする工程、及び
(iii)蓄積した非相同タンパク質を製造した細胞から採取する工程。
・バイオマス製造の要求のための成長設備を消費する空間がない;
・外の気候条件に依存しない;
・植物病原体の感染のリスクがない;
・多量のより高い均一なバイオマスの急速な供給 − これは、医薬品生成物のために特に重要なことである(調節の関心を減らす);
・バイオマスの採取が非常に容易である(特別な採取装置を要求しない);
・凍結及び/乾燥による保存が、低い体積のバイオマス比により容易である;
・バイオマスの容易なプロセス及び生成物の容易な精製(少ないリグニン、少ない繊維、少ない宿主タンパク質、少ない顔料);
・バイオマスが高く制御された無菌の条件下で製造される(調節の関心を減らす);
・全体の植物と比較した速度の利点、バイオマスの容易なスケールアップ(0.1lの出発培養液が、15日でスケールアップして、1000lの懸濁培養液中で100kgのバイオマスを提供できる;5d 2.5l −> 5d 50l −> 5d 1000l);
・良好な空時収率/空間利用(1m2あたりのバイオマス;製造及びインキュベートは、通常、細胞パックを密にスタックすることを可能にする照明を要求しない);
・低体積の生物学的ベクター懸濁液を、同一量のバイオマスを感染するために要求する(タンク浸潤と比較して少ない“ゴミ”);
・葉及び植物を基礎とする方法でよりも容易な完全な抑制の実施;
・細菌又はウイルスの適用が、“細胞パック”法で容易である;
・個々の細胞において誘引された意図的でない転写後のサイレンシングが、原形質連絡によって連結されたいくつかの近い細胞に限られ、かつ全身に広がらない;
・追加の化学化合物(例えば、誘導因子、誘発物質、ホルモン又は代謝物製造のための前駆体)を、より容易に及びより経済的に適用することができる;
・パックした細胞から分泌されたタンパク質のみを溶出する可能性(少ない宿主タンパク質、完全に加工された分泌されたタンパク質のみにアクセス);
・汚染によって危険な生成物も製造できる(高い生物安全性レベル);
・高いスループットスクリーニングの可能性(マルチウェルフィルタープレート);
・より適応性のある使用者が定義したサイズ及び形状を実現できる;
・より自動化を受け入れられる;
・高いスループットスクリーニング及び実験設計のアプローチを可能にする、植物病原体又は他の生物の標準化した成長アッセイのために使用されてよい極めて均一な植物細胞材料;
・単一の形式で、同時及び/順次に、種々の方法、技術及び操作工程を容易に組み合わせる可能性。
・生体反応で懸濁培地(フラスコ撹拌又は発酵槽)と、又は固体培地上で成長したカルスと比較して一時的に提供された導入遺伝子の増加させた発現;
・植物細胞(抗菌剤、栄養要求株)の過剰成長を避けるために細菌成長を制御又は抑制する必要がない;
・“細胞パック”の使用が、生体反応抑制と比較して植物細胞の割合がより高いアグロバクテリアにする;
・細胞パック中の細胞を撹拌しないため、より密接なベクターと細胞の接触をもたらし、それらを剪断しない;
・第二培養過程又は期間において高く濃縮したバイオマスによって、低量の高価な化合物を要求する(例えば誘発物質(アセトシリンゴン)、ホルモン、代謝生成物のための前駆体等);
・第二の培養過程が、植物細胞の製造のために使用される生体反応の外で生じる。これは、例えば、懸濁細胞の一定の供給を保証するために第一の培養過程における連続発酵ストラテジーの使用を可能にする。これは、比較的高価な生体反応物の良好な及びより経済的な利用をもたらし、高い能力を可能にする;
・細胞パックの多孔質構造によって、酸素供給の制限がほとんど重要でない。
細胞パックにおける一過性発現と、懸濁液における一過性発現との比較
本発明による細胞パックにおける一時的な組換えタンパク質製造を評価するために、アグロバクテリウムで浸透させた細胞パックにおけるDsRed及び抗体2G12の一過性発現を、液体培地中でアグロバクテリウムで懸濁細胞を同時培養する先行技術の方法と比較した。
細胞パックにおけるマラリア原虫抗原の一過性発現
細胞パックがマラリア抗原の製造のために使用できるかどうか試験するために、マラリア原虫の種々のタンパク質を一時的に製造した。
スクリーニング適用のための細胞パックの使用
細胞パックが非常に均質であるために、細胞パックはスクリーニング目的のためにも理想的である。従って、このことを、この実施例において、使用したアグロバクテリウム株及び種々の発現ベクターの一時的な生成物蓄積に対する影響を評価することによって証明した。2つの異なる発現ベクターを使用した。色素体を標的とするDsRedを動かす35Sプロモーターを含有する二成分ベクターpUTA−TPrfp、及びタバコモザイクウイルス(TMV)のcDNAを動かす35Sプロモーターを含有する二成分ベクターpTRBO−Gであり、外被タンパク質配列をGFPによって置換する図1H)(J. A. Lindbo, “TRBO : a high−efficiency tobaco mosaic virus RNA−based overexpression vector”, Plant Phys 145: 1232−1240, 2007)。それぞれのベクターを、2つの異なるアグロバクテリウム株中に導入した。標準ベクターpUTA−TPrfpを、GV3101::pP90RK及びEHA105中に導入し、ウイルス性ベクターpTRBO−Gを、GV2260及びEHA105中に導入した(R. Helens et al., “A guide to Agrobacterium binary Ti vectors”, TIBS 5: 446−451, 2000)。
カラムでの細胞パックにおける一過性発現
カラムで、細胞パックを生じ、浸透し、かつ維持することができるかどうかを試験するために、いくつかの試験を実施した。この実施例において、異なる標的の赤色蛍光タンパク質DsRed及び緑色蛍光タンパク質GFPを、パックした細胞の形成体をカラムで一時的に発現させた。
一時的なタンパク質製造に対する増加した通気の効果
形質転換したパックした細胞の性能に対する通気の影響を調べるために、種々の設定で試験した:(1)活発に通気した細胞パック、(2)消極的に通気した細胞パック、(3)中心空気チャネルを有する細胞パック、(4)有孔カラムにおける細胞パック(図11A)。
パックした細胞から分泌された生成物の非破壊的採取
組換え分泌生タンパク質を細胞を破壊せずに溶出できるかどうか測定するために、BY−2懸濁細胞を、カラム中でパックし、そしてアグロ感染によって一時的に形質転換した。それぞれERを保持したDsRed(図2C)、分泌性DsRed(図1A)、ERを保持したDsRed(図1B)及びタンパク質体を形成するDsRed(図1E)と一緒に分泌性モノクローナル抗体M12のための発現構築物を含有する種々のアグロバクテリウム株を実験のために使用した。M12抗体(150kDa)及びDsRed(108kDa)は、大きい分泌タンパク質についての例である。ERを保持したDsRedが細胞内であるために、植物細胞をインキュベート又は溶出中に破壊させるかどうかを試験することが適した対照である。不溶性タンパク質体を形成するDsRedを、全体の細胞抽出物のための対照として使用した。
代謝工学による新規の二次代謝物の製造
パックした細胞における新たな生合成経路を確立するために、タバコにおいて存在しない酵素トリプトファンデカルボキシラーゼ(TDC;EC4.1.1.28)を、BY−2細胞パックにおいて一時的に発現させた。
種々の植物種の懸濁培養液からの細胞パック
タバコBY−2懸濁細胞に加えて、いくつかの他の植物細胞懸濁液を使用して細胞パックを生じた。
ニチニチソウの細胞を、MS67培地(3%スクロース、4.4g/LのMurashige及びSkoog塩、0.6mg/Lのチアミン、0.2mg/Lのキネチン、1mg/Lの2,4−ジクロロフェノキシ酢酸、pH5.8)中で又はBY−2培地(実施例1)中で、暗所で、回転撹拌機(180rpm)上で、26℃で培養した。細胞を、新たな培地中に毎週継代培養した(20:100)。
シロイスナズナの細胞を、ARA培地(3%スクロース、4.4g/LのMurashige及びSkoog塩、0.5mg/Lのナフタレン酢酸、0.1mg/Lのキネチン、pH5.7)中で、16時間光源/8時間暗所で、回転撹拌機(180rpm)上で26℃で培養した。細胞を、新たな培地中に毎週継代培養した(15:100)。
ベンサミアナタバコの細胞をBY−2培地(実施例1)中で、暗所で、回転撹拌機(180rpm)上で26℃で培養した。細胞を、新たな培地中に毎週継代培養した(20:100)。
病原体の培養のための基質としてのパックした細胞の使用
3.64mlの細胞パック(質量=2g、直径=5.5cm、高さ=0.15cm、密度=0.55g/cm3)を、標準条件(実施例1)下で50mlの成長させた4日後のBY−2培養液を使用して生じた。細胞パックを、空のペトリ皿に置き、そして細胞パック(細胞パックの質量=3g;密度=0.825g/cm3)によって完全に吸収される1mlの浸透培地(50g/lのスクロース、2g/lのグルコース、0.5g/lのFerty 2 Mega(Planta Dungemittel、Germany)、pH5.3)で浸透した。この量の体積(すなわち、細胞パック2グラムあたり1ml以下)を、ペトリ皿での細胞パックのインキュベートの開始のために有利であることを見出し、それというのも空隙が数時間で再構成されるからである。これは、蒸発によって0.6g/cm3未満まで減少した細胞パックの密度の制御した測定によって確認される。重要なことに、より多い量の液体(すなわち、細胞パック2グラムあたり1mlより多い)は、極めて有害であり、それというのも、過剰な液体によって、空隙を再構築できず、細胞の生存を適切に指示するため又はさらに細胞死を妨げるためには非常に高すぎる密度を有する細胞パックをもたらすからである。
トランスジェニック懸濁細胞系列から生じた細胞パックから分泌された生成物の非破壊的採取
トランスジェニックBY2懸濁培養液を、ERを保持したDsRed(図2C)と一緒に分泌性モノクローナル抗体M12のための発現構築物で形質転換した後に生じた。カナマイシンを含有するプレート上での選択後に、トランスジェニックカルスを、液体培地に移して、極めて均質な検索培養液を確立した。懸濁培養液を、4%の懸濁培養液を新たな液体培地(実施例1)中に移すことによって毎週継代培養した。
マルチタイタープレートで生じた細胞パックの使用
細胞パックを、プレートの底部で液体を透過できるフィルターを有するマルチタイタープレート(Receiver plate 20μm(No.740686.4)、MACHEREY−NAGEL、Germany)を使用して、前記したように生じた。
野生型細胞から生じた細胞パックから回収した内因性タンパク質
5日後のBY−2野生型懸濁培養液の懸濁細胞を、細胞パックを生じるために採取し、又は細胞を懸濁培養液中でさらに培養させた。細胞パック及び懸濁培養液の双方を、さらに4日間インキュベートした。2.5g(FCW)(新しい細胞の質量)の細胞パックを、14mlのポリプロピレンカラムを使用して実施例6において記載されたように製造した。液体の取り出し後に、細胞パックを26℃で90%の相対湿度でインキュベートした。5日後のBY−2懸濁培養液を、さらに、26℃で回転攪拌機上で180rpmで培養した。4日後に、分泌したタンパク質を採取した。実施例6において記載したように2.5mlの緩衝液で細胞パックを洗浄することによって、分泌したタンパク質を細胞パックから採取した。9日後の懸濁培養液から分泌したタンパク質を、真空濾過を使用して培地から細胞を取り出すことにより採取した。溶出した又は分泌したタンパク質の25μlの試料を、クーマシー染色したSDS−PAGEゲルで解析した(図16)。この実施例は、分泌された天然のタンパク質を、本発明によって生じた及びインキュベートした細胞パックから回収することができることを示す。ゲル上のそれぞれのバンドは、種々の性質のタンパク質を示す。ゲル解析は、分泌された天然タンパク質の量及び種類が、細胞パックにおける細胞と懸濁液における細胞と異なることも示した。ある天然タンパク質の分泌は、実施的に、細胞パックの細胞において増加した(図16、矢印で示される)。
Claims (9)
- 培地不足の、多孔質構造の及び組織化されていない多層細胞パックの形で植物細胞材料を生じさせるための、及び該細胞パックの続く保存のための方法であって、該方法が、(i)植物細胞懸濁培養液から細胞を分離することによって多孔質構造を有する細胞パックを提供する工程、ここで前記植物細胞懸濁培養液から分離した細胞が、天然又はトランスジェニックであり、かつ所望の生成物を蓄積でき、かつ細胞パックによって含まれる液体の含有率を、1cm3あたり0.1〜0.9g(湿潤細胞質量)の細胞パック密度に相当するまで低減及び調整し、これによって培地不足の及び多孔質構造の性質の前記細胞パックを得る、並びに(ii)前記培地不足の及び多孔質構造の細胞パックを、非液体環境中で、50〜100%の相対湿度下で、維持培地又は成長培地上に前記細胞パックを置くことなく、又は維持培地又は成長培地に接触して前記細胞パックを置くことなく、前記所望の生成物を蓄積するために、インキュベートする工程、を含む、前記方法。
- 前記細胞パックによって含まれる液体の含有率を、1cm3あたり0.2〜0.85g(湿潤細胞質量)の細胞パック密度に相当するまで低減及び調整する、請求項1に記載の方法。
- 前記トランスジェニック細胞を、一時的に又は安定して形質転換して、前記所望の生成物を蓄積する、請求項1又は2に記載の方法。
- 前記工程(i)において提供される細胞パックによって含まれる細胞を、工程(ii)を受ける前に、少なくとも1つの非相同核酸配列を含む少なくとも1つの発現ベクターで一時的に形質転換し、少なくとも1つの非相同核酸配列が所望の生成物をコードする、請求項1に記載の方法。
- 前記工程(ii)が所望の生成物の採取を含む、請求項1から4までのいずれか1項に記載の方法。
- 前記所望の生成物が、天然の及び非相同のタンパク質又はポリペプチド、二次代謝物、及びマーカーからなる群から選択される、請求項1から5までのいずれか1項に記載の方法。
- 請求項1から6までのいずれか1項に記載の方法によって得た又は得られる培地不足の、多孔質構造の及び組織化されていない多層細胞パックの形での植物細胞材料の、解析又は診断目的のための使用(但しヒトの診断を除く)。
- 前記細胞パックによって含まれる細胞を、生物の、又は解析又は診断されるべき物質の存在でインキュベートする、請求項7に記載の使用。
- 請求項1から6までのいずれか1項に記載の方法によって得た又は得られる培地不足の、多孔質構造の及び組織化されていない多層細胞パックの形での植物細胞材料を含む診断ツール。
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
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US201261592780P | 2012-01-31 | 2012-01-31 | |
EP12000618.4A EP2623603A1 (en) | 2012-01-31 | 2012-01-31 | Method for the generation and cultivation of a plant cell pack |
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US61/592,780 | 2012-01-31 | ||
PCT/EP2013/000296 WO2013113504A1 (en) | 2012-01-31 | 2013-01-31 | Method for the generation and cultivation of a plant cell pack |
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WO2015165583A1 (en) * | 2014-04-28 | 2015-11-05 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Fermentation systems |
EP3392339A1 (en) | 2017-04-18 | 2018-10-24 | Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen | Improved genome editing in plant cells |
EP3400962A1 (en) | 2017-05-09 | 2018-11-14 | Fraunhofer Gesellschaft zur Förderung der angewandten Forschung e.V. | Inhibitors of il-38 for use in treating and/or preventing cancer in a subject |
KR20200015629A (ko) * | 2017-06-02 | 2020-02-12 | 프라운호퍼-게젤샤프트 추르 푀르데룽 데어 안제반텐 포르슝 에 파우 | 식물 세포 팩의 자동 형질전환 방법 |
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JPH0919285A (ja) * | 1995-07-06 | 1997-01-21 | Nisshinbo Ind Inc | 植物組織培養培地 |
US6740526B1 (en) | 1999-09-22 | 2004-05-25 | Wayne R. Curtis | Quantitative transient protein expression in plant tissue culture |
US20020092037A1 (en) * | 2000-10-10 | 2002-07-11 | Connett-Porceddu Marie Bernice | Use of membrane supports in plant tissue culture processes |
ES2249094B1 (es) | 2003-07-29 | 2007-06-01 | Valeo Termico, S.A. | Sistema de regulacion de la temperatura del aceite para vehiculos equipados con un circuito de refrigeracion de liquidos y su correspondiente procedimiento. |
US7897838B2 (en) * | 2004-04-20 | 2011-03-01 | Temasek Life Sciences Laboratory Limited | Methods for high efficiency transformation and regeneration of plant suspension cultures |
CN102146377B (zh) * | 2010-01-12 | 2014-12-31 | 王为民 | 一种通过胚性细胞组织制备蛋白质的方法 |
CN102174463B (zh) * | 2011-01-30 | 2012-07-18 | 桂林医学院 | 罗汉果愈伤组织细胞悬浮体系的培养方法 |
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CN104093845B (zh) | 2017-06-23 |
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CN104093845A (zh) | 2014-10-08 |
US20140342455A1 (en) | 2014-11-20 |
WO2013113504A1 (en) | 2013-08-08 |
EP2809786A1 (en) | 2014-12-10 |
JP2015505465A (ja) | 2015-02-23 |
ES2644262T3 (es) | 2017-11-28 |
CA2856383C (en) | 2022-08-09 |
CA2856383A1 (en) | 2013-08-08 |
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