JP6998470B2 - Folr1に特異的に結合する抗体及びその用途 - Google Patents
Folr1に特異的に結合する抗体及びその用途 Download PDFInfo
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- C07—ORGANIC CHEMISTRY
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Description
重鎖(配列番号1)
EVQLVESGGGVVQPGRSLRLSCSASGFTFSGYGLSWVRQAPGKGLEWVAM
ISSGGSYTYYADSVKGRFAISRDNAKNTLFLQMDSLRPEDTGVYFCARHG
DDPAWFAYWGQGTPVTVSS
軽鎖(配列番号2)
DIQLTQSPSSLSASVGDRVTITCSVSSSISSNNLHWYQQKPGKAPKPWIY
GTSNLASGVPSRFSGSGSGTDYTFTISSLQPEDIATYYCQQWSSYPYMYT
FGQGTKVEIK
FOLR1に対する結合能改善のための最適配列を確保するために、Fab断片を用いて親抗体に基づいてCDRライブラリーを構築した。
親抗体の軽鎖及び重鎖においてそれぞれ可変領域を合成し、pComb3X-TTから定常領域を合成した。PCR条件は、94℃で2分間、前変性化(pre-denaturation)し、94℃30秒、56℃30秒、72℃30秒で25サイクル反応した後、72℃で7分間反応した。PCR反応の鋳型が一つの場合、100ngを使用し、二つの場合、それぞれ3μLずつ混ぜた混合物を使用し、プライマーは20pM濃度で3μLずつ使用し、dNTPは0.05mM、Taq重合酵素は0.5μL(2.6unit)、反応体積は100μLである。反応完了後、増幅の有無は1%アガロースゲル電気泳動で確認し、Qiagenゲル抽出キットを用いて精製し、2次及び3次PCRは、前記増幅された部分を鋳型として次の重複型PCRを行った。PCR反応産物は、Qiagenゲル抽出キットを用いてアガロースゲルでDNAを精製し、SfiI制限酵素で切断した後、再びゲル抽出(gel extraction)を行った。SfiI切断された抗体遺伝子153ngとSfiI切断されたpComb3Xベクター136ngを混合した後、10X T4 DNAライゲーションバッファーとリガーゼ10unitを添加して室温で3時間反応した後、E.coli DH5αセルに42℃で45秒間ヒートショックを与え、37℃で1.5時間培養する方法で形質転換して得たコロニーから、50kDaサイズを有するFab断片からなる抗体ライブラリー作製用鋳型を確保した。
相補性決定領域に人為的に多様性を導入してライブラリーを作製した。(http://www.bioinf.org.uk/abs/)に記述された 内容から所定の抗体のCDR及びFRが確認できる。
ヒトFOLR1と結合するライブラリークローンを選別するためにパンニングを行ったが、パンニング回数が増加するほど結合能が向上したクローンが得られた。
選別したクローンのFOLR1に対する結合能を比較するためにそれぞれ精製を行った。精製を行うに先立ち、Fab部分だけを発現させるために宿主株をTG1からTOP10F’細胞に変えた。
1次選別したクローンの結合能を相対的に比較する目的でELISAをクローン濃度別に行った。方法は次の通りである。FOLR1を1μg/mLで25μLずつ96ウェルプレートに分注してRTで1時間コーティングした後、3%スキムミルク180μLでRTで1時間ブロッキングさせた。ブロッキングする間に1次抗体として使用する試料を準備した。1次抗体としてはスクリーニングで選別した試料を使用したが、0.1~100nM(0、0.1、0.3、1、3、10、30、100nM)に希釈して準備し、使用するまで冷蔵保管した。ブロッキング後に3%スキムミルクを除去し、1次抗体を25μLずつ添加してRTで1時間以上反応させた。反応が終わった後、PBS-Tween20(0.1%)バッファーで3回洗浄し、2次抗体でHA-HRPを3%スキムミルクで3,000倍希釈して25μLずつ添加し、RTで1時間以上反応させた。反応が終わった後、PBS-Tween20(0.1%)バッファーで3回洗浄し、基質TMBを25μLずつ添加して発色を確認した。約5分経過後、1M H2SO4を25μLずつ添加して反応を止め、450nmの波長で吸光度を測定した。測定結果は、GraphPad Prism7プログラムを通じてEC(Effector concentration)値を求めた。
ファージライブラリーのELISAを通じて選別したクローンのランダム化させた相補性決定領域の配列を糾明した。96ウェルプレートに培養したクローンから選別した各クローンの培養液1uLを鋳型としてpC3X-f及びpC3X-bプライマーを用いて94℃で2分間前変性化し、94℃で30秒、56℃で30秒、72℃で2分で25サイクル反応した後、72℃で7分間反応した。増幅の有無は、1%アガロ-スゲル電気泳動で確認し、増幅されたPCR産物をQIAvac 96を用いてDWで精製して配列分析を依頼した。ベクター内リーダー配列を用いて相補性決定領域の配列を糾明した。
抗体ライブラリー作製方法と同一にして最終クローンpvAbを作製し、使用した鋳型とプライマーは表7に、vAb抗体配列情報は表8~表10に整理した。
変形抗体(vAb)を生産するために、expiCHO細胞に変形抗体(vAb)タンパク質をコーディングする遺伝子を含むベクター(pc3.4-vAbL、pc3.4-vAbH)を形質感染させて培養し、親和性クロマトグラフィー(affinity chromatography)を用いて精製した。親和性樹脂であるMabSelect SuReTM(GE Healthcare)をXK16カラムに充填し、バッファーA(25mMトリス、pH7.0、25mM NaCl)を流してカラムを平衡化した後、培養液を流して親和性樹脂と結合させてバッファーB(25mMクエン酸、pH3.5)で変形抗体(vAb)タンパク質を溶出させた。精製の終わったカラムは0.5M NaOHで洗浄した後、20%エタノールで満たして冷蔵保管した。溶出された試料に1Mのトリス(pH9.0)を適正量添加して試料のpHを6.0に調整した。試料の状態は10%SDS-PAGEを通じて確認した。こうして得た変形抗体(vAb)タンパク質は10mMコハク酸ナトリウム、30mMスクロースpH6.0の組成を持つバッファーで透析(dialysis)によってバッファー交換を行った。
実施例2で製造した変形抗体(vAb)の結合能を親抗体と比較するために、ELISAを抗体濃度0.006~6.250ng/mL条件で行った。方法は、実施例1-5に記述の内容と同様にした。測定の結果、変形抗体であるvAb1~vAb5は親抗体に比べて4.48~1.42倍さらに強くFOLR1と結合することが測定された(表11)。各測定は親抗体に対比して個別の実験から得た測定値である。
FOLR1に対する実施例2で製造した変形抗体であるvAb1の結合親和度を測定するためにBiacore3000を用いてSPR方法を行った。実行方法は、実施例1-5に記述の内容と同様にした。結果は、BIA評価用ソフトウェアを用いてセンサグラム分析してKD値を計算した。変形抗体vAb1は0.24nMのKD値であり、親抗体に比べて4倍も高い結合親和度を示した(表12)。これは、ELISAを用いて得た値の相対的比と類似している。
Claims (11)
- FOLR1(Folate receptor-α)に特異的に結合する抗体又はその抗原結合断片であって、
i)配列番号3の重鎖CDR1;配列番号4の重鎖CDR2;配列番号28の重鎖CDR3;配列番号29の軽鎖CDR1;配列番号30の軽鎖CDR2;及び配列番号8の軽鎖CDR3;
ii)配列番号3の重鎖CDR1;配列番号4の重鎖CDR2;配列番号5の重鎖CDR3;配列番号29の軽鎖CDR1;配列番号30の軽鎖CDR2;及び配列番号8の軽鎖CDR3;
iii)配列番号3の重鎖CDR1;配列番号4の重鎖CDR2;配列番号5の重鎖CDR3;配列番号29の軽鎖CDR1;配列番号7の軽鎖CDR2;及び配列番号8の軽鎖CDR3;
iv)配列番号3の重鎖CDR1;配列番号4の重鎖CDR2;配列番号5の重鎖CDR3;配列番号6の軽鎖CDR1;配列番号30の軽鎖CDR2;及び配列番号8の軽鎖CDR3;又は
i)配列番号3の重鎖CDR1;配列番号4の重鎖CDR2;配列番号28の重鎖CDR3;配列番号6の軽鎖CDR1;配列番号7の軽鎖CDR2;及び配列番号8の軽鎖CDR3;
を含む、抗体又はその抗原結合断片。 - 前記抗体又はその抗原結合断片は、FOLR1の生物学的活性を抑制することを特徴とする、請求項1に記載の抗体又はその抗原結合断片。
- 前記抗体又はその抗原結合断片は、FOLR1を発現する細胞の抗体依存性細胞傷害活性(antibody-dependent cellular cytotoxicity)を誘導することを特徴とする、請求項1に記載の抗体又はその抗原結合断片。
- 前記抗体又はその抗原結合断片は、FOLR1に対する結合分離定数(dissociation constant)が1×10-7M以下であることを特徴とする、請求項1に記載の抗体又はその抗原結合断片。
- 配列番号1の重鎖可変領域及び配列番号32の軽鎖可変領域、
配列番号1の重鎖可変領域及び配列番号33の軽鎖可変領域、
配列番号1の重鎖可変領域及び配列番号34の軽鎖可変領域、
配列番号31の重鎖可変領域及び配列番号2の軽鎖可変領域、又は
配列番号31の重鎖可変領域及び配列番号32の軽鎖可変領域、
を含む、請求項1に記載の抗体又はその抗原結合断片。 - 請求項1に記載の抗体又はその抗原結合断片に薬物が接合された抗体-薬物接合体。
- 前記抗体又はその抗原結合断片はリンカーを介して薬物と結合することを特徴とする、請求項6に記載の抗体-薬物接合体。
- 前記薬物は、化学療法剤、毒素、マイクロRNA(miRNA)、siRNA、shRNA又は放射性同位元素であることを特徴とする、請求項6に記載の抗体-薬物接合体。
- 請求項1~5のいずれか一項に記載の抗体又はその抗原結合断片、又は請求項6~8のいずれか一項に記載の抗体-薬物接合体を含む、癌の予防又は治療用医学組成物。
- 前記癌は、卵巣癌、乳癌、肺癌、腎臓癌、結腸癌、脳癌、直膓癌、子宮頸癌又は子宮内膜癌であることを特徴とする、請求項9に記載の癌の予防又は治療用医学組成物。
- 請求項1~5のいずれか一項に記載の抗体又はその抗原結合断片を含む、疾病の診断用組成物。
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CA3096982C (en) | 2023-10-03 |
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