JP6553517B2 - Mdr大腸菌特異的抗体 - Google Patents
Mdr大腸菌特異的抗体 Download PDFInfo
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- JP6553517B2 JP6553517B2 JP2015553093A JP2015553093A JP6553517B2 JP 6553517 B2 JP6553517 B2 JP 6553517B2 JP 2015553093 A JP2015553093 A JP 2015553093A JP 2015553093 A JP2015553093 A JP 2015553093A JP 6553517 B2 JP6553517 B2 JP 6553517B2
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Description
a)DSM 26763で寄託された宿主細胞により産生される抗体軽鎖の可変領域;および/または
b)DSM 26762で寄託された宿主細胞により産生される抗体重鎖の可変領域;あるいは
c)(a)および/または(b)の機能活性バリアントを使用すること
を特徴とする。
−抗体軽鎖の可変領域は、DSM 26763で寄託された大腸菌宿主細胞に含まれるプラスミドによりコードされるか、またはその機能活性バリアントである;ならびに/あるいは
−抗体重鎖の可変領域は、DSM 26762で寄託された大腸菌宿主細胞に含まれるプラスミドによりコードされるか、またはその機能活性バリアントである。
−抗体軽鎖の可変領域は、DSM 26763で寄託された大腸菌宿主細胞により産生されるか、またはその機能活性バリアントである;ならびに/あるいは
−抗体重鎖の可変領域は、DSM 26762で寄託された大腸菌宿主細胞により産生されるか、またはその機能活性バリアントである。
a)DSM 28171で寄託された宿主細胞により産生される抗体軽鎖の可変領域;および/または
b)DSM 28172で寄託された宿主細胞により産生される抗体重鎖の可変領域;あるいは
c)(a)および/または(b)の機能活性バリアントを使用すること
を特徴とする。
−抗体軽鎖の可変領域は、DSM 28171で寄託された大腸菌宿主細胞に含まれるプラスミドによりコードされるか、あるいはその機能活性バリアントである;および/または
−抗体重鎖の可変領域は、DSM 28172で寄託された大腸菌宿主細胞に含まれるプラスミドによりコードされるか、あるいはその機能活性バリアントである。
−抗体軽鎖の可変領域は、DSM 28171で寄託された大腸菌宿主細胞により産生されるか、あるいはその機能活性バリアントである;および/または
−抗体重鎖の可変領域は、DSM 28172で寄託された大腸菌宿主細胞により産生されるか、あるいはその機能活性バリアントである。
A
−DSM 26763で寄託された宿主細胞に含まれる8D5−1G10−LCと命名された抗体軽鎖の可変領域をコードする配列;および/または
−DSM 26762で寄託された宿主細胞に含まれる8D5−1G10−HCと命名された抗体重鎖の可変領域をコードする配列;
あるいは
B
−DSM 28171で寄託された宿主細胞に含まれる8D10−C8−LCと命名された抗体軽鎖の可変領域をコードする配列;および/または
−DSM 28172で寄託された宿主細胞に含まれる8D10−C8−HCと命名された抗体重鎖の可変領域をコードする配列。
A
DSM 26763および/またはDSM 26762;あるいは
B
DSM 28171および/またはDSM 28172。
(a)抗体または抗体産生細胞を含有する試料を用意し;そして
(b)試料中の抗体、または試料により産生される抗体と、8D5−1G10または8D10−C8と命名された抗体により認識されるエピトープとの結合を査定し、その際、抗体とエピトープの間の陽性反応によりその抗体を候補抗体と同定する
ことを含む方法を提供する。
(a)抗体または抗体産生細胞を含有する試料を用意し;そして
(b)試料中の抗体、または試料により産生される抗体と、ST131−O25b:H4株のO25b抗原および非MDR大腸菌株のO25抗原またはO25a抗原との結合を査定し、その際、O25抗原またはO25a抗原と対比して抗体とO25b抗原の間の特異的な陽性反応によりその抗体を候補抗体と同定する
ことを含む方法を提供する。
(a)本発明に従って同定した候補抗体を用意し;そして
(b)候補抗体のモノクローナル抗体、またはヒト化形もしくはヒト形、またはその誘導体であって候補抗体と同じエピトープ結合特異性を備えたものを調製する
ことを含む方法を提供する。
(a)非ヒト動物を8D5−1G10または8D10−C8と命名された抗体により認識されるエピトープで免疫化し;
(b)単離したB細胞から不死化細胞系を形成し;
(c)b)で得た細胞系をスクリーニングして、前記エピトープに結合するモノクローナル抗体を産生する細胞系を同定し;そして
(d)モノクローナル抗体、またはヒト化形もしくはヒト形の抗体、またはその誘導体であってモノクローナル抗体と同じエピトープ結合特異性を備えたものを調製する
ことを含む方法を提供する。
(a)非ヒト動物をST131−O25b:H4株のO25b抗原で免疫化して、抗体を産生するB細胞を単離し;
(b)単離したB細胞から不死化細胞系を形成し;
(c)これらの細胞系をスクリーニングして、大腸菌のO25抗原またはO25a抗原と対比してO25b抗原に優先的に結合するモノクローナル抗体を産生する細胞系を同定し;そして
(d)モノクローナル抗体、またはヒト化形もしくはヒト形の抗体、またはその誘導体であってモノクローナル抗体と同じエピトープ結合特異性を備えたものを調製する
ことを含む方法を提供する。
a)診断用抗体製剤、および/または
b)さらなる診断試薬、
ならびに/あるいは抗体および診断試薬のうち少なくとも1つを固定化するための固相を、別個の構成要素として、あるいは前記a)および/またはb)のいずれかの構成要素のキャリヤーとして。
(a)本発明のエピトープ;
(b)場合により、(a)のエピトープと自然界での関連性がないさらなるエピトープ;および
(c)キャリヤー。
a)その抗体の生物活性フラグメントであり、そのフラグメントは分子の配列の少なくとも50%、好ましくは少なくとも60%、少なくとも70%、少なくとも80%、少なくとも90%、または少なくとも95%、最も好ましくは少なくとも97%、98%または99%を含む;
b)その抗体から少なくとも1個のアミノ酸の置換、付加および/または欠失により誘導され、その際、機能活性バリアントは、抗体などの分子またはそれの一部に対して、少なくとも50%、好ましくは少なくとも60%、より好ましくは少なくとも70%、より好ましくは少なくとも80%、よりさらに好ましくは少なくとも90%、よりいっそう好ましくは少なくとも95%、最も好ましくは少なくとも97%、98%または99%の配列同一性をもつ;ならびに/あるいは
c)抗体またはその機能活性バリアント、およびさらにそのポリペプチドまたはヌクレオチド配列に対してヘテロロガスな少なくとも1個のアミノ酸またはヌクレオチドからなる。
“中性”アミノ酸を、それらの各3文字コードおよび1文字コードならびに極性と共に以下に示す:
アラニン:(Ala,A) 非極性,中性;
アスパラギン:(Asn,N) 極性,中性;
システイン:(Cys,C) 非極性,中性;
グルタミン:(Gln,Q) 極性,中性;
グリシン:(Gly,G) 非極性,中性;
イソロイシン:(Ile,I) 非極性,中性;
ロイシン:(Leu,L) 非極性,中性;
メチオニン:(Met,M) 非極性,中性;
フェニルアラニン:(Phe,F) 非極性,中性;
プロリン:(Pro,P) 非極性,中性;
セリン:(Ser,S) 極性,中性;
トレオニン:(Thr,T) 極性,中性;
トリプトファン:(Trp,W) 非極性,中性;
チロシン:(Tyr,Y) 極性,中性;
バリン:(Val,V) 非極性,中性;および
ヒスチジン:(His,H) 極性,正(10%) 中性(90%)
“正”電荷アミノ酸は下記のものである:
アルギニン:(Arg,R) 極性,正;および
リジン:(Lys,K) 極性,正
“負”電荷アミノ酸は下記のものである:
アスパラギン酸:(Asp,D) 極性,負;および
グルタミン酸:(Glu,E) 極性,負。
1. 多剤耐性(MDR)大腸菌株のO25b抗原に特異的に結合する、単離された抗体。
−DSM 26763および/またはDSM 26762で寄託された宿主細胞から得られるもの、またはその機能活性バリアント;
−DSM 28171および/またはDSM 28172で寄託された宿主細胞から得られるもの、またはその機能活性バリアント。
A
a)DSM 26763で寄託された宿主細胞により産生されるかもしくはそれから得られる抗体軽鎖の可変領域;および/または
b)DSM 26762で寄託された宿主細胞により産生されるかもしくはそれから得られる抗体重鎖の可変領域;あるいは
c)(a)および/または(b)の機能活性バリアント;
あるいは
B
a)DSM 28171で寄託された宿主細胞により産生されるかもしくはそれから得られる抗体軽鎖の可変領域;および/または
b)DSM 28172で寄託された宿主細胞により産生されるかもしくはそれから得られる抗体重鎖の可変領域;あるいは
c)(a)および/または(b)の機能活性バリアント。
A
−DSM 26763で寄託された宿主細胞に含まれる8D5−1G10−LCと命名された抗体軽鎖の可変領域をコードする配列;および/または
−DSM 26762で寄託された宿主細胞に含まれる8D5−1G10−HCと命名された抗体重鎖の可変領域をコードする配列;
あるいは
B
−DSM 28171で寄託された宿主細胞に含まれる8D10−C8−LCと命名された抗体軽鎖の可変領域をコードする配列;および/または
−DSM 28172で寄託された宿主細胞に含まれる8D10−C8−HCと命名された抗体重鎖の可変領域をコードする配列。
A
− DSM 26763および/またはDSM 26762;
あるいは
B
− DSM 28171および/またはDSM 28172。
(a)抗体または抗体産生細胞を含有する試料を用意し;そして
(b)試料中の抗体、または試料により産生される抗体と、8D5−1G10または8D10−C8と命名された抗体により認識されるエピトープとの結合を査定し、その際、抗体とエピトープの間の陽性反応によりその抗体を候補抗体と同定する
ことを含む方法。
(a)抗体または抗体産生細胞を含有する試料を用意し;そして
(b)試料中の抗体、または試料により産生される抗体と、ST131−O25b:H4株のO25b抗原および非MDR大腸菌株のO25a抗原との結合を査定し、その際、O25a抗原と対比して抗体とO25b抗原との間の特異的な陽性反応によりその抗体を候補抗体と同定する
ことを含む方法。
(a)定義20または21に従って同定した候補抗体を用意し;そして
(b)候補抗体のモノクローナル抗体、またはヒト化形もしくはヒト形、またはその誘導体であって候補抗体と同じエピトープ結合特異性を備えたものを調製する
ことを含む方法。
(a)非ヒト動物を8D5−1G10または8D10−C8と命名された抗体により認識されるエピトープで免疫化し;
(b)単離したB細胞から不死化細胞系を形成し;
(c)b)で得た細胞系をスクリーニングして、前記エピトープに結合するモノクローナル抗体を産生する細胞系を同定し;そして
(d)モノクローナル抗体、またはヒト化形もしくはヒト形の抗体、またはその誘導体であってモノクローナル抗体と同じエピトープ結合特異性を備えたものを調製する
ことを含む方法。
(a)非ヒト動物をST131−O25b:H4株のO25b抗原で免疫化して、抗体を産生するB細胞を単離し;
(b)単離したB細胞から不死化細胞系を形成し;
(c)これらの細胞系をスクリーニングして、大腸菌のO25a抗原と対比してO25b抗原に優先的に結合するモノクローナル抗体を産生する細胞系を同定し;そして
(d)モノクローナル抗体、またはヒト化形もしくはヒト形の抗体、またはその誘導体であってモノクローナル抗体と同じエピトープ結合特異性を備えたものを調製する
ことを含む方法。
(a)定義34に記載のエピトープ;
(b)場合により、(a)のエピトープと自然界での関連性がないさらなるエピトープ;および
(c)キャリヤー。
カナマイシン耐性をコードするカセットでkpsクラスター(莢膜合成をコードする)を置き換えることにより、代表的なST131−O25b:H4 81009株の無莢膜変異体(81009Δkps::kan,[Szijarto et al, FEMS Microbiol Lett, 2012, 332: 131-6])を作成した。致死量未満のこの変異株の生細胞またはホルムアルデヒド不活化細胞を用いて、2週間隔で4回、マウスを免疫化した。その後、それらのマウスから得た血清試料を分析し、O25b抗原に対して最高IgG力価を示すマウス(ELISA、イムノブロット法、および表面染色において)の脾臓をハイブリドーマ作成に用いた。サブクローニングに続いて、精製O25b抗原に特異的でありかつO25b抗原を発現する生菌野生型大腸菌株に結合する抗体を分泌する、数種類のハイブリドーマクローンを選択した。これらのmAbをさらに試験するためにハイブリドーマ上清から精製した。
大腸菌ST131のLPSを熱フェノール/水法により単離し、透析、プロテイナーゼK消化および超遠心により精製した。LPS調製物の平均収率は乾燥細菌質量の2.61%であった。LPSをSDS−PAGEにより分析して、種々の数のオリゴ糖反復単位(RU)で置換されたコアオリゴ糖(OS)および非置換コアオリゴ糖からなる画分が示された。O−特異的多糖(O−PS)および種々のオリゴ糖成分を緩和な酸加水分解により放出させ、Bio−Gel P−10でのゲル濾過により単離した。それらの画分を糖およびメチル化の分析、NMR分光分析、ならびにMALDI−TOF質量分析(MS)により分析した。
O25b特異的mAb 8D5−1G10を、1μm直径のラテックスビーズ(Polysciences)に調製業者の指示に従って結合させた。ラテックス結合ビーズをそれらが種々の大腸菌株を凝集させる効力について試験した。白金耳1杯分の細菌(約108cfu)を、PBS中の1% mAb結合ラテックスビーズ懸濁液10μlと混合した。図4に示すように、O25b抗原を発現する大腸菌株は、数秒間の穏やかな撹拌後に強い凝集パターンを示した。これに対し、O25aまたはO2抗原を発現する大腸菌株は、同じ試薬で凝集しなかった。したがって、この推定診断試薬は、O25b(およびO25a)陽性大腸菌の検出に現在用いられている技術水準の凝集試薬(すなわち、O25に対するポリクローナルウサギ血清)より特異的であると考えられる。
O25b特異的mAb(O25aに対する交差反応性をもつもの、またはもたないもの)の潜在防御効果を、致死性ネズミ菌血症モデルにおいて試験した。マウス5匹のグループに100μgの精製した8D5−1G10または8D10−C8を腹腔内投与した。24時間後にマウスを致死量(パイロット実験で予め決定)のO25b抗原発現性大腸菌株81009(2×108CFU/マウス)により静脈内攻撃した。マウスの致死性を1日1回、3週間モニターした。図6は、類似の転帰をもつ2つの独立した実験の結果を合わせて示す。PBSで模擬免疫化したマウスのうち90%が感染したが、被験mAbは両方とも、モニターした感染後3週間の期間にわたって統計的に(Logrank検定)有意の生存率増大をもたらした。
ある態様において、本発明は以下であってもよい。
[態様1]多剤耐性(MDR)大腸菌(E. coli)株のO25b抗原に特異的に結合する、単離された抗体。
[態様2]モノクローナル抗体である、態様1に記載の抗体。
[態様3]O25aおよびO25b抗原に共通のエピトープを交差特異的に結合する、態様1または2に記載の抗体。
[態様4]大腸菌のO25a抗原に対比してO25b抗原に優先的に結合するか、あるいは両抗原に対して少なくとも同等のアフィニティーで結合する、態様1〜3のいずれか1に記載の抗体。
[態様5]全長モノクローナル抗体の結合部位を有し、または結合部位を含んだ少なくとも1つの抗体ドメインを含むその抗体フラグメントを有し、好ましくはO25b抗原を10−7M未満、好ましくは10−8M未満のKdで結合するアフィニティーを有する、態様1〜4のいずれか1に記載の抗体。
[態様6]抗体が、8D5−1G10または8D10−C8と命名された抗体と同じエピトープを結合し、好ましくは8D5−1G10または8D10−C8と命名された抗体と同じ結合部位を含む、態様1〜5のいずれか1に記載の抗体。
[態様7]多剤耐性(MDR)大腸菌(E. coli)株のO25b抗原に特異的に結合する単離されたモノクローナル抗体であって、抗体8D5−1G10の抗原結合部位を含むか、または抗体8D5−1G10であるかもしくはそれに由来し、または抗体8D5−1G10の機能活性バリアントであり、好ましくは抗体8D5−1G10が
a)DSM 26763で寄託された宿主細胞により産生される抗体軽鎖の可変領域;および/または
b)DSM 26762で寄託された宿主細胞により産生される抗体重鎖の可変領域;あるいは
c)(a)および/または(b)の機能活性バリアントである可変領域
によって特徴付けられる、前記抗体。
[態様8]多剤耐性(MDR)大腸菌(E. coli)株のO25b抗原に特異的に結合する単離されたモノクローナル抗体であって、O25aおよびO25b抗原に共通のエピトープを交差特異的に結合し、抗体8D10−C8の抗原結合部位を含むか、または抗体8D10−C8であるかもしくはそれに由来し、または抗体8D10−C8の機能活性バリアントであり、好ましくは抗体8D10−C8が
a)DSM 28171で寄託された宿主細胞により産生される抗体軽鎖の可変領域;および/または
b)DSM 28172で寄託された宿主細胞により産生される抗体重鎖の可変領域;あるいは
c)(a)および/または(b)の機能活性バリアントを使用すること
によって特徴付けられる、前記抗体。
[態様9]下記のヌクレオチド配列を含むプラスミド:
A
−DSM 26763で寄託された宿主細胞に含まれる8D5−1G10−LCと命名された抗体軽鎖の可変領域をコードする配列;および/または
−DSM 26762で寄託された宿主細胞に含まれる8D5−1G10−HCと命名された抗体重鎖の可変領域をコードする配列;
あるいは
B
−DSM 28171で寄託された宿主細胞に含まれる8D10−C8−LCと命名された抗体軽鎖の可変領域をコードする配列;および/または
−DSM 28172で寄託された宿主細胞に含まれる8D10−C8−HCと命名された抗体重鎖の可変領域をコードする配列。
[態様10]態様1〜8のいずれか1に記載の抗体の軽鎖および/または重鎖を発現するコード配列を含む発現カセットであって、その発現カセットまたはコード配列が態様9に記載のプラスミドに由来する、発現カセット。
[態様11]態様9に記載のプラスミドまたは態様10に記載の発現カセットを含む、宿主細胞。
[態様12]態様1〜8のいずれか1に記載の抗体を調製する方法であって、態様10に記載の宿主細胞を、その抗体を産生する条件下で培養または維持する方法。
[態様13]候補抗体を同定する方法であって、
(a)抗体または抗体産生細胞を含有する試料を用意し;そして
(b)試料中の抗体、または試料により産生される抗体と、8D5−1G10または8D10−C8と命名された抗体により認識されるエピトープとの結合を査定し、その際、抗体とエピトープの間の陽性反応によりその抗体を候補抗体と同定する
ことを含む方法。
[態様14]候補抗体を同定する方法であって、
(a)抗体または抗体産生細胞を含有する試料を用意し;そして
(b)試料中の抗体、または試料により産生される抗体と、ST131−O25b:H4株のO25b抗原および非MDR大腸菌(E. coli)株のO25a抗原との結合を査定し、その際、O25a抗原と対比して抗体とO25b抗原の間の特異的な陽性反応によりその抗体を候補抗体と同定する
ことを含む方法。
[態様15]態様1〜8のいずれか1に記載の抗体を調製する方法であって、
(a)態様13または14に従って同定した候補抗体を用意し;そして
(b)候補抗体のモノクローナル抗体、またはヒト化形もしくはヒト形、またはその誘導体であって候補抗体と同じエピトープ結合特異性を備えたものを調製する
ことを含む方法。
[態様16]MDR大腸菌(E. coli)感染のリスクをもつ対象またはそれに罹患している対象を処置する際の、対象における感染の制限またはその感染から生じる病的状態の改善に有効な量の抗体を対象に投与することを含む使用のための、好ましくは腎盂腎炎、続発性菌血症、敗血症、腹膜炎、髄膜炎、および人工呼吸器関連肺炎の治療または予防のための、態様1〜8のいずれか1に記載の抗体。
[態様17]好ましくは非経口または粘膜用の配合物を含む、場合により医薬的に許容できるキャリヤーまたは賦形剤を含有する、態様1〜8のいずれか1に記載の抗体の医薬製剤。
[態様18]対象において、LPS O25bを発現するMDR株により起きる大腸菌感染症である、膀胱炎または尿道炎、上行性または血行性腎盂腎炎を含めた上部および下部尿路感染症を伴なう感染症、特に糖尿病患者におけるもの、ならびに菌血症、敗血症、腹膜炎または腸定着を伴なう感染症を判定する診断に使用するための、態様1〜8のいずれか1に記載の抗体。
[態様19]場合により、標識付きの抗体、および/または標識付きのさらなる診断試薬、および/または抗体と診断試薬のうち少なくとも1つを固定化するための固相を含有する、態様1〜8のいずれか1に記載の抗体の診断用製剤。
[態様20]8D5−1G10または8D10−C8と命名された抗体により認識される単離されたエピトープ。
[態様21]下記のものを含む免疫原:
(a)態様20に記載のエピトープ;
(b)場合により、(a)のエピトープと自然界での関連性がないさらなるエピトープ;および
(c)キャリヤー。
[態様22]態様1〜8のいずれか1に記載の抗体または態様20に記載のエピトープをコードする、単離された核酸。
Claims (10)
- 多剤耐性(MDR)大腸菌(E. coli)株のO25b抗原を特異的に認識する抗原結合部位を含む、単離されたモノクローナル抗体又はその抗原結合フラグメント。
- a)DSM 26763で寄託された宿主細胞により産生される抗体軽鎖の可変領域;および
b)DSM 26762で寄託された宿主細胞により産生される抗体重鎖の可変領域;
によって特徴付けられる、請求項1に記載の抗体又はその抗原結合フラグメント。 - MDR大腸菌(E. coli)感染のリスクをもつ対象またはそれに罹患している対象を処置する際の、対象における感染の制限またはその感染から生じる病的状態の改善に有効な量の抗体又はその抗原結合フラグメントを対象に投与することを含む使用のための、請求項1又は2に記載の抗体又はその抗原結合フラグメント。
- 腎盂腎炎、続発性菌血症、敗血症、腹膜炎、髄膜炎、および人工呼吸器関連肺炎の治療または予防のための、請求項3に記載の抗体又はその抗原結合フラグメント。
- 請求項1又は2に記載の抗体又はその抗原結合フラグメントを含む、医薬製剤。
- 非経口または粘膜用の配合物を含む、請求項5に記載の医薬製剤。
- 医薬的に許容できるキャリヤーまたは賦形剤を含有する、請求項5又は6に記載の医薬製剤。
- 請求項1又は2に記載の抗体又はその抗原結合フラグメントを用いた、対象において、LPS O25bを発現するMDR株により起きる大腸菌感染症を判定する方法であって、
該対象の体液の試料を該抗体又はその抗原結合フラグメントと接触させることにより感染をエクスビボ判定し、ここで、該抗体又はその抗原結合フラグメントの特異的な免疫反応により感染を判定する、上記方法。 - 標識付きの請求項1又は2に記載の抗体又はその抗原結合フラグメント、および/または
請求項1又は2に記載の抗体又はその抗原結合フラグメントが固定化された固相
を含有する、診断用製剤。 - 請求項1又は2に記載の抗体又はその抗原結合フラグメントをコードする、単離された核酸分子。
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