JP7320282B2 - 異常tdp-43を分解除去する抗体断片 - Google Patents
異常tdp-43を分解除去する抗体断片 Download PDFInfo
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Description
該抗体断片が、3以下のアミノ酸置換をしてもよい、GFNIKDYY (配列番号1)のアミノ酸配列からなる重鎖CDR1、IDPEDGET (配列番号2)のアミノ酸配列からなる重鎖CDR2、及びTIIYYYGSRYVDY (配列番号3)のアミノ酸配列からなる重鎖CDR3を含む重鎖可変領域、並びに/又は
3以下のアミノ酸置換をしてもよい、SSISSSY (配列番号4)のアミノ酸配列からなる軽鎖CDR1、RTSのアミノ酸配列からなる軽鎖CDR2、及びQQGSSIPLT (配列番号5)のアミノ酸配列からなる軽鎖CDR3を含む軽鎖可変領域を含み、
該抗体断片が、scFv、VH又はVLである、
修飾抗体断片。
項2.前記抗体断片がscFvである、項1に記載の修飾抗体断片。
項3.前記抗体断片がヒト化抗体断片である、項1又は2に記載の修飾抗体断片。
項4.項1~3のいずれか一項に記載の修飾抗体断片をコードする核酸。
項5.項4に記載の核酸を含む発現ベクター。
項6.項4に記載の核酸を含む遺伝子治療剤。
項7.TDP-43の凝集体が蓄積する疾患の治療用である、項6に記載の治療剤。
項8.前記TDP-43の凝集体が蓄積する疾患が筋萎縮性側索硬化症、前頭側頭型認知症、又はPerry症候群である、項7に記載の治療剤。
項9.熱ショックタンパク質を誘導させるために用いられる、項6に記載の治療剤。
項10.前記熱ショックタンパク質がHsp70である、項9に記載の治療剤。
項11.項4に記載の核酸の有効量を哺乳動物に投与する工程を含む、TDP-43の凝集体が蓄積する疾患の治療方法。
項12.前記TDP-43の凝集体が蓄積する疾患が筋萎縮性側索硬化症、前頭側頭型認知症、又はPerry症候群である、項11に記載の方法。
該抗体断片が、3以下のアミノ酸置換をしてもよい、GFNIKDYY (配列番号1)のアミノ酸配列からなる重鎖CDR1、IDPEDGET (配列番号2)のアミノ酸配列からなる重鎖CDR2、及びTIIYYYGSRYVDY (配列番号3)のアミノ酸配列からなる重鎖CDR3を含む重鎖可変領域、並びに/又は
3以下のアミノ酸置換をしてもよい、SSISSSY (配列番号4)のアミノ酸配列からなる軽鎖CDR1、RTSのアミノ酸配列からなる軽鎖CDR2、及びQQGSSIPLT (配列番号5)のアミノ酸配列からなる軽鎖CDR3を含む軽鎖可変領域を含み、該抗体断片が、scFv、VH又はVLであることを特徴とする。
以下の試験例における材料、試薬及び実験方法は特に記載しない限り次の通りとした。
マウスハイブリドーマより、市販のmRNA抽出キット(Invitrogen, Carlsbad, CA, USA)及びcDNA合成キット(SuperScript III Reverse Transcriptase (Invitrogen))を用いて、各々メッセンジャーRNA及びそれを鋳型としてオリゴdTプライマーによりcDNAを作製した。プライマーペア、5'-GAC TCG AGT CGA CAT CGA TTT TTT TTT TTT TTT TT-3' (配列番号9)と5'-CTC AAT TTT CTT GTC CAC CTT GGT GC-3' (配列番号10)とをVH cDNA用に、5'-GAC TCG AGT CGA CAT CGA TTT TTT TTT TTT TTT TT-3' (配列番号11)と5'-CTC ATT CCT GTT GAA GCT CTT GAC AAT GGG-3' (配列番号12)とをVL cDNA用に、常法のPCR増幅を経てクローニングした。
VH (アミノ酸配列)
EVQLQQSGAELVKPGASVKLSCTASGFNIKDYYMHWVKQRTEQGLEWIGRIDPEDGETKYAPKFQGKATITADTSSNTAYLQLSSLTSEDTAVYYCTIIYYYGSRYVDYWGQGTTLTVS (配列番号21)
VL (アミノ酸配列)
EIVLTQSPTTMAASPGEKITITCSASSSISSSYLHWYQQKPGFSPKLLIYRTSNLASGVPARFSGSGSGTSYSLTIGTMEAEDVATYYCQQGSSIPLTFGSGTKLEI (配列番号22)
VH (塩基配列)
GAGGTTCAGCTGCAGCAGTCTGGGGCAGAGCTTGTGAAGCCAGGGGCCTCAGTCAAGTTGTCCTGCACAGCTTCTGGCTTCAACATTAAAGACTACTATATGCACTGGGTGAAGCAGAGGACTGAACAGGGCCTGGAGTGGATTGGAAGGATTGATCCTGAGGATGGTGAAACTAAATATGCCCCGAAATTCCAGGGCAAGGCCACTATTACAGCAGACACATCCTCCAACACAGCCTACCTGCAGCTCAGCAGCCTGACATCTGAGGACACTGCCGTCTATTACTGTACTATCATTTATTACTACGGTAGTCGCTACGTTGACTACTGGGGCCAAGGCACCACTCTCACAGTCTCC (配列番号23)
VL (塩基配列)
GAAATTGTGCTCACCCAGTCTCCAACCACCATGGCTGCATCTCCCGGGGAGAAGATCACTATCACCTGCAGTGCCAGCTCAAGTATAAGTTCCAGTTACTTGCATTGGTATCAGCAGAAGCCAGGATTCTCCCCTAAACTCTTGATTTATAGGACATCCAATCTGGCTTCTGGAGTCCCAGCTCGCTTCAGTGGCAGTGGGTCTGGGACCTCTTACTCTCTCACAATTGGCACCATGGAGGCTGAAGATGTTGCCACTTACTACTGCCAGCAGGGTAGTAGTATACCACTCACGTTCGGCTCGGGGACAAAGTTGGAAATA (配列番号24)
HEK293A細胞及びNeuro2a細胞は10%ウシ胎児血清(FBS)及びペニシリン・ストレプトマイシン(100倍希釈)を含むDulbecco変法Eagle培地(DMEM;ナカライテスク株式会社)を用いて、37℃、5%CO2インキュベーター内で培養した。プラスミドトランスフェクションはFuGene HD (Roche)を用い、添付文書に従って行った。
HEK293A細胞をプロテアーゼ阻害剤(Roche)を含むRIPAバッファー(20 mM HEPES-KOH [pH 7.4], 125 mM NaCl, 2 mM EDTA, 1% Nonidet-P40, 1% sodium-deoxycholate)で溶解したライセートを作製した。
scFvと抗原の細胞内での結合性を定量するためにサンドイッチELISAを行った。FLAGタグ標識をしたTDP-43 (TDP-43-FLAG)とMycタグ標識をしたscFv (scFv-Myc)とをHEK293A細胞に上記の方法を用いてトランスフェクションさせ、48時間後に細胞をRIPAバッファーに溶解させてライセートを作製した。別途1000分の1に希釈した抗FLAG抗体(M2 Sigma)をコートしたELISAプレート(Nunc)にライセートを加え22℃で1時間反応させた後、500分の1に希釈したウサギ由来の抗Myc抗体(Cell signaling社)と4℃、16時間反応させた。
MycタグをつけたscFv (scFv-Myc、scFv-Myc-CL1、scFv-Myc-CMA)を培養細胞(HEK293A)にトランスフェクションし、48時間後にシクロヘキシミド(CHX)を100μg/mlの濃度で投与し、新たなタンパク質合成を止めた。その直後、プロテアソーム阻害薬(ラクタシスチン)、ライソゾーム阻害薬(バフィロマイシン)を各々10μM、0.1μMの濃度で投与し、無投薬のコントロールを含め10、24時間後に細胞を回収し、2メルカプトエタノールを含む2% SDSサンプルバッファーに溶解して変性させた。その後は上記のウェスタンブロット法に従って、抗Myc抗体を用いて検出し、バンドをデンシトメトリー法によって定量化した。
Haloタグ(Promega)で標識させたTDP-43 (TDP-43-Halo)とMyc標識させたscFv (scFv-Myc)とを上記の方法で共発現させた。48時間後に発現したTDP-43-Haloを1μMのdiAcFAMリガンド(Promega)を15分間投与してラベルした後、培養培地を洗浄して、通常の培地で培養を続けた。diAcFAMリガンド投与直後、12時間後、24時間後に細胞を2% SDSサンプルバッファーにて回収し、5-20%ポリアクリルアミドゲル電気泳動を行った後、ゲルを蛍光撮影機(LAS-3000; FUJIFILM)にて撮像した。その後、ゲルをウェスタンブロッティングのためPVDFメンブレンに転写し、解析を行った。
GFP標識をしたTDP-43 (TDP-43-GFP)とscFv-CMAとをHEK293A細胞に上記の方法を用いて共発現させた。24時間後に培養培地内に細胞の核を染色するHoechst 33342 (ナカライテスク株式会社)を投与し、タイムラプス蛍光顕微鏡(BZX-710; Keyence, Osaka)にて30分おきに付属のソフトウェアを用いて48時間連続撮影を行った。撮像場所は初回の撮影前にランダムに4箇所決め、その後は同じ場所を撮影した。
96マルチウェル上のNeuro2a細胞にFLAGタグ標識をしたTDP-43とMycタグ標識をしたscFvとを上記の方法で共発現させた。48時間後に市販の生細胞・死細胞定量キット(MultiTox-Fluor multiplex cytotoxicity assay; Promega)のglycyl-phenylalanylamino fluorocoumarin (GF-AFC)及びbisalanyl-alanyl-phenylalanyl-rhodamine 110 (bis-AAF-R110)を同時に投与して2時間インキュベーター内で反応させた。その後、蛍光マルチプレートリーダー(Perkin Elmer)を用いて生細胞を蛍光度400/505 nm、死細胞を485/520 nmで測定した。
上記の方法でトランスフェクションをしたHEK293A細胞から市販のRNA抽出キット(Invitrogen)及びcDNA作製キット(Invitrogen)を用いてcDNAを作製した。SYBER Green定量キット(Toyobo)を取扱説明書のプロトコールに従い、リアルテイムPCR検出システム(Bio-Rad)にてPCRを行い、付属のソフトウェアを用いて定量解析を行った。用いたプライマー配列は以下のとおりである。HSP70, 5'-CAA GAT CAC CAT CAC CAA CG-3' (配列番号25)及び5'-TCG TCC TCC GCT TTG TAC TT-3' (配列番号26); GAPDH, 5'-GCA CCG TCA AGG CTG AGA AC-3' (配列番号27)及び5'-TGG TGG TGA AGA CGC CAG TGG A-3' (配列番号28)
妊娠13.5日のSJR妊娠マウスよりイソフルレン吸入麻酔下で子宮を取り出し、子宮を保持しながら目視下に胎児側脳室に清潔なPBSに溶解したTDP-43-GFPあるいはGFP、scFV-Myc、mCherry (タカラバイオ株式会社)の発現プラスミド(pCAG-TDP-43-GFP、pCAG-scFv-Myc, pCAG-mCherry)を1~2μL注入した。そして、皿電極(CUY650P5; Nepagene)で脳外側を軽くはさみ、プラスミドの注入側に陰極を合わせ、5回間欠的に電気刺激を与えた(31 V, 50 ms, at 950-ミリ秒間隔)。その後、子宮を母体の腹腔に戻し、縫合した後妊娠を継続させた。
上記の方法で妊娠継続させた後、胎仔を取り出しペントバルビタールをフック内投与した後、経心臓的に4% PFAを投与し灌流固定を行った。脳を取り出した後、さらに4℃、16時間4% PFA溶液内で後固定し、その後、OCTコンパウンド(サクラファインテックジャパン株式会社)に包埋し液体窒素で固定した。クリオスタットで12μmの切片を作製しMASコートスライドグラスに貼付した。
scFv-MycとTDP-43 (野生型、核移行シグナル変異型(mNLS)、核内凝集体形成型(C173S/C175S)、細胞質凝集体形成型(mNLS-C173S/C175S))とを培養細胞(HEK293A)に発現させ、ライセートをサンドイッチELISA法によって解析し、TDP-43とscFvの結合性を数値化した。その結果を図1に示す。
培養細胞(HEK293A)にTDP-43-FLAG (野生型及び細胞質凝集体形成型(mNLS-C173S/C175S))あるいはベクター、加えてscFv-Myc (シグナルなし、CL1、CMAシグナル)あるいはベクターを共発現させ、48時間後に細胞を回収した。細胞からcDNAを回収し、Hsp70のmRNAをリアルタイムPCRアッセイにて解析した結果を図5左に示す。細胞ライセートをウェスタンブロッティング法にてHsp70を検出し、デンシトメトリーにてタンパク量を定量化した結果を図5右に示す。
妊娠13.5日齢(E13.5)のマウス胎仔脳側脳室内にTDP-43-GFP、scFv-CMAを導入して妊娠継続させ妊娠16日目に胎仔能を固定して脳切片を作製し、抗GFP抗体、抗ユビキチン抗体、抗リン酸化TDP-43抗体にて免疫染色を行った。ミスフォールドTDP-43とはmNLS-TDP-43 C173S/C175Sのことである。結果を図7に示す。
Claims (9)
- ミスフォールドしたTDP-43に結合性を有する抗体断片と、シャペロン介在性オートファジー移行シグナルペプチドとから構成される修飾抗体断片であって、
該抗体断片が、GFNIKDYY (配列番号1)のアミノ酸配列からなる重鎖CDR1、IDPEDGET (配列番号2)のアミノ酸配列からなる重鎖CDR2、及びTIIYYYGSRYVDY (配列番号3)のアミノ酸配列からなる重鎖CDR3を含む重鎖可変領域、並びに
SSISSSY (配列番号4)のアミノ酸配列からなる軽鎖CDR1、RTSのアミノ酸配列からなる軽鎖CDR2、及びQQGSSIPLT (配列番号5)のアミノ酸配列からなる軽鎖CDR3を含む軽鎖可変領域を含み、
該抗体断片が、scFvである、
修飾抗体断片。 - 前記抗体断片がヒト化抗体断片である、請求項1に記載の修飾抗体断片。
- 請求項1又は2に記載の修飾抗体断片をコードする核酸。
- 請求項3に記載の核酸を含む発現ベクター。
- 請求項3に記載の核酸を含む遺伝子治療剤。
- TDP-43の凝集体が蓄積する疾患の治療用である、請求項5に記載の治療剤。
- 前記TDP-43の凝集体が蓄積する疾患が筋萎縮性側索硬化症、前頭側頭型認知症、又はPerry症候群である、請求項6に記載の治療剤。
- 熱ショックタンパク質を誘導させるために用いられる、請求項5に記載の治療剤。
- 前記熱ショックタンパク質がHsp70である、請求項8に記載の治療剤。
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JP2013162772A (ja) | 2012-02-13 | 2013-08-22 | Shiga Univ Of Medical Science | Tdp−43の凝集体が蓄積する疾患の発症リスクを予測する方法、診断薬及び治療薬 |
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