JP7071349B2 - ピログルタメートアミロイド-βに対する抗体及びその使用 - Google Patents
ピログルタメートアミロイド-βに対する抗体及びその使用 Download PDFInfo
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Description
本発明は、3pE Aβに結合する単離された抗体又はその抗原結合フラグメントを提供する。本明細書において、用語「抗体」は、抗原又はその一部に結合することができる免疫グロブリンタンパク質、特に3pE Aβに特異的に結合することができる免疫グロブリンタンパク質を指す。抗原への抗体の結合は、当業者に既知の方法によって測定することができ、一例として、BIAcore(商標)器具の使用がある。一般的に言えば、抗体又は抗原結合抗体フラグメントは、解離定数が1μM以下、好ましくは100nM以下、最も好ましくは10nM以下であるとき、抗原に特異的に結合すると言われている。
抗体又はその抗原結合フラグメントが固相に結合しているアッセイ、及び抗体が液体媒体の中にあるアッセイを含む、抗体又はその抗原結合フラグメントを用いるイムノアッセイの全ての様式が、現在の好ましい実施形態に係る使用に関して想到されることが理解されるべきである。本発明の特徴を具体化する抗体を使用して、検体を検出するために使用され得るイムノアッセイの方法としては、標識された検体(検体類似体)と試料中の検体とが抗体に対して競い合う競合的(試薬限定)アッセイ、及び抗体が標識された単一部位免疫測定アッセイなどが挙げられるが、これらに限定されない。
本発明の態様は、アミロイドβ関連状態におけるアミロイドβの沈着を予防、改善、治療、及び/又は減少させるための方法であって、それを必要とする対象に、本明細書に開示される抗体又はその抗原結合フラグメントを治療有効量で投与することを含む、方法に関する。本発明のさらなる態様は、本明細書に開示される抗体又はその抗原結合フラグメントを含む、アミロイドβ関連状態におけるアミロイドの沈着を予防、改善、治療、及び/又は減少させるための医薬組成物を含む。本発明の方法は、有効量の、本明細書に記載される1つ以上の抗体又はその抗原結合フラグメントを、それを必要とする対象に投与することを含む。
本発明は、上述の方法で使用することができるキット及びデバイスを提供する。好ましくは、キット及びデバイスは、3pE Aβに結合する抗体又はその抗原結合フラグメントを含む。さらに、キットは、試薬及び指示書を含んでもよい。使用説明書は、例えば、紙に印刷されてもよく、かつ/又は電子可読媒体において提供されてもよい。あるいは、使用説明書は、例えば、キットの製造業者又は流通業者によって指定されたインターネットウェブサイトにユーザを誘導することによって提供されてもよい。
モノクローナル抗体の生成
3匹のBalb/cマウス(Janvier Labs)を、完全フロイントアジュバント(Sigma)中のH2N-pEFRHDSGC-COOH(配列番号21)(Eurogentec)で初回免疫した。ペプチドは、製造業者の指示に従って、Imject Maleimide Activated BSA kit(Pierce,Rockford,IL)などの市販のキットを使用して、ペプチドをCOOH-末端システイン残基を介してMaleimide Activated Bovine Serum Albumin(Life Technologies)にカップリングすることによって調製した。マウスを、最初は完全な、続いて不完全なフロイントアジュバント(Sigma)中の100μg又は200μgのBSAにカップリングしたペプチドで2週間ごとに追加免疫した。
感度試験のためのサンドイッチELISA
選択されたAβ3pEモノクローナル抗体について、Aβ3-40(配列番号24)(AnaSpec,Fremont,USA)及びAβ3pE-40(配列番号22)(AnaSpec,Fremont,USA)の検出に対する感度を、合成ペプチドを標準物質として使用してサンドイッチアッセイで評価した。コーティングのためのAβ/pE3/1~19抗体及び検出のためのJRF/cAβ40/28-HRPOの組み合わせを使用して、検出の感度を調査した。
交差反応性試験のためのサンドイッチELISA
選択されたAβ3pEモノクローナル抗体Aβ/pE3/1について、げっ歯類Aβ3pE-40並びにヒトAβ1-40(配列番号23)、Aβ3-40(配列番号24)、Aβ1-42(配列番号25)、Aβ3-42(配列番号26)、Aβ11pE-40(配列番号28)及びAβ11pE-42(配列番号29)との交差反応性を、合成ペプチドを使用して評価した。Aβ/pE3/1+JRF/cAβ40/28-HRPOの組み合わせを使用して、Aβ1-40(配列番号23)、Aβ3-40(配列番号24)、Aβ11pE-40及びげっ歯類Aβ3pE-40との交差反応性を調査した。Aβ/pE3/1+JRF/cAβ42/26-HRPOの組み合わせを使用して、Aβ1-42(配列番号25)、Aβ11pE-42及びAβ3-42(配列番号26)との交差反応性を調査した。最大10,000pg/mLの濃度を試験した。
ヒトAD脳組織におけるプラークへの抗体反応性を試験するための免疫組織化学
ヒトAD脳組織におけるプラークへのAβ/pE3/1の反応性を、ホルマリン固定、パラフィン包埋(FFPE)脳組織、並びに非固定凍結保存脳組織の両方において調査した。
ホルマリン固定パラフィン包埋AD脳:厚さ6μmの切片を、ミクロトーム(Leica,Wetzlar,Germany)を使用して、ホルマリン固定パラフィン包埋脳から調製した。Labvision Autostainer(Thermo Fisher Scientific,Fremont,CA)で染色を行った。簡潔に述べると、脱パラフィン化後及び70%ギ酸(Merck)エピトープの回収後、内因性ペルオキシダーゼについて切片をブロッキングし、Aβ/pE3/1一次抗体と共にインキュベートした。HRPOにコンジュゲートした二次抗マウス又は抗ウサギ抗体を適用し(Envision)、3,3’-ジアミノベンジジン(DAB;Dako)を色原体として利用した。最後に、全ての切片をヘマトキシリン(Dako)で対比染色した。
脳組織における抗体のターゲットエンゲージメント及び毒性
Aβ/pE3/1(クローン1からの抗体)による処置後のターゲットエンゲージメント及び毒性を調査した。
Aβ/pE3/1の生体分子親和性結合
表面プラズモン共鳴(SPR)は、生体分子相互作用を調査するために使用される無標識の検出方法である。センサ表面上の質量の小さい変化を監視して、この直接リアルタイム結合アッセイは、生体分子間の相互作用に関する定性的及び定量的データを提供する;すなわち、平衡結合定数(親和性、KD)及び速度定数(ka/kd;複合体の会合速度ka、及び複合体の解離速度kd)を決定する。この方法は、タンパク質-タンパク質及びタンパク質-核酸の相互作用、並びにタンパク質と小分子との相互作用の研究において有用である。ここで、Aβ/pE3/1とAβ-3pE-40ペプチドとの相互作用を調査した。
本発明は、以下の態様を包含し得る。
[1]
a)配列番号2の重鎖可変領域の相補性決定領域(CDR)1、CDR2及びCDR3を有する重鎖可変領域と、
b)配列番号13の軽鎖可変領域のCDR1、CDR2及びCDR3を有する軽鎖可変領域と、を含む、3pE Aβに結合する単離された抗体又はその抗原結合フラグメント。
[2]
a)前記重鎖可変領域のCDR1が、配列番号3を含み、
b)前記重鎖可変領域のCDR2が、配列番号4を含み、
c)前記重鎖可変領域のCDR3が、配列番号5を含み、
d)前記軽鎖可変領域のCDR1が、配列番号14を含み、
e)前記軽鎖可変領域のCDR2が、配列番号15を含み、かつ、
f)前記軽鎖可変領域のCDR3が、配列番号16を含む、上記[1]のいずれかに記載の単離された抗体又はその抗原結合フラグメント。
[3]
a)前記重鎖可変領域のCDR1が、配列番号3であり、
b)前記重鎖可変領域のCDR2が、配列番号4であり、
c)前記重鎖可変領域のCDR3が、配列番号5であり、
d)前記軽鎖可変領域のCDR1が、配列番号14であり、
e)前記軽鎖可変領域のCDR2が、配列番号15であり、かつ、
f)前記軽鎖可変領域のCDR3が、配列番号16である、上記[1]~[2]のいずれかに記載の単離された抗体又はその抗原結合フラグメント。
[4]
a)前記重鎖可変領域のCDR1が、配列番号6を含み、
b)前記重鎖可変領域のCDR2が、配列番号7を含み、
c)前記重鎖可変領域のCDR3が、配列番号8を含み、
d)前記軽鎖可変領域のCDR1が、配列番号17を含み、
e)前記軽鎖可変領域のCDR2が、配列番号18を含み、かつ、
f)前記軽鎖可変領域のCDR3が、配列番号19を含む、上記[1]に記載の単離された抗体又はその抗原結合フラグメント。
[5]
a)前記重鎖可変領域のCDR1が、配列番号6であり、
b)前記重鎖可変領域のCDR2が、配列番号7であり、
c)前記重鎖可変領域のCDR3が、配列番号8であり、
d)前記軽鎖可変領域のCDR1が、配列番号17であり、
e)前記軽鎖可変領域のCDR2が、配列番号18であり、かつ、
f)前記軽鎖可変領域のCDR3が、配列番号19である、上記[1]又は[4]のいずれかに記載の単離された抗体又はその抗原結合フラグメント。
[6]
a)前記重鎖可変領域のCDR1が、配列番号9を含み、
b)前記重鎖可変領域のCDR2が、配列番号10を含み、
c)前記重鎖可変領域のCDR3が、配列番号11を含み、
d)前記軽鎖可変領域のCDR1が、配列番号20を含み、
e)前記軽鎖可変領域のCDR2が、配列番号18を含み、かつ、
f)前記軽鎖可変領域のCDR3が、配列番号16を含む、上記[1]に記載の単離された抗体又はその抗原結合フラグメント。
[7]
a)前記重鎖可変領域のCDR1が、配列番号9であり、
b)前記重鎖可変領域のCDR2が、配列番号10であり、
c)前記重鎖可変領域のCDR3が、配列番号11であり、
d)前記軽鎖可変領域のCDR1が、配列番号20であり、
e)前記軽鎖可変領域のCDR2が、配列番号18であり、かつ、
f)前記軽鎖可変領域のCDR3が、配列番号16である、上記[1]又は[6]のいずれかに記載の単離された抗体又はその抗原結合フラグメント。
[8]
a)前記重鎖可変領域が、配列番号2のアミノ酸配列を含み、かつ、
b)前記軽鎖可変領域が、配列番号13のアミノ酸配列を含む、上記[1]~[7]のいずれかに記載の単離された抗体又はその抗原結合フラグメント。
[9]
前記抗体が、モノクローナル抗体である、上記[1]~[8]のいずれかに記載の単離された抗体又はその抗原結合フラグメント。
[10]
前記抗体が、ヒト化抗体である、上記[1]~[9]のいずれか一項に記載の単離された抗体又はその抗原結合フラグメント。
[11]
a)配列番号1の重鎖と、
b)配列番号12の軽鎖と、を含む、3pE Aβに結合する単離された抗体。
[12]
上記[1]~[11]のいずれか一項に記載の抗体を生成するハイブリドーマ。
[13]
上記[12]に記載のハイブリドーマを使用することを含む、モノクローナル抗体を生成する方法。
[14]
上記[1]~[11]のいずれかに記載の抗体又はその抗原結合フラグメントと、医薬的に許容される担体と、を含む、医薬組成物。
[15]
β-アミロイドタンパク質を含有するプラークの形成に関連する状態を治療する方法であって、それを必要とする対象に上記[1]~[11]のいずれかに記載の抗体又はその抗原結合フラグメントを投与することを含む、方法。
[16]
前記状態が、アルツハイマー病である、上記[15]に記載の方法。
[17]
前記状態が、トリソミー21(ダウン症候群)、びまん性レビー小体病、封入体筋炎、脳アミロイド血管症、及びオランダ型アミロイドーシスを伴う遺伝性脳出血(HCHWA-D)に関連する認知症からなる群から選択される、上記[15]に記載の方法。
[18]
アルツハイマー病に関連するプラークを減少させる方法であって、それを必要とする対象に上記[1]~[11]のいずれかに記載の抗体又はその抗原結合フラグメントを投与することを含む、方法。
[19]
3pE Aβのシーディング活性を阻害する方法であって、それを必要とする対象に上記[1]~[11]のいずれかに記載の抗体又はその抗原結合フラグメントを投与することを含む、方法。
Claims (19)
- a)配列番号2の重鎖可変領域の相補性決定領域(CDR)1、CDR2及びCDR3を有する重鎖可変領域と、
b)配列番号13の軽鎖可変領域のCDR1、CDR2及びCDR3を有する軽鎖可変領域と、を含む、3pE Aβに結合する単離された抗体又はその抗原結合フラグメント。 - a)前記重鎖可変領域のCDR1が、配列番号3を含み、
b)前記重鎖可変領域のCDR2が、配列番号4を含み、
c)前記重鎖可変領域のCDR3が、配列番号5を含み、
d)前記軽鎖可変領域のCDR1が、配列番号14を含み、
e)前記軽鎖可変領域のCDR2が、配列番号15を含み、かつ、
f)前記軽鎖可変領域のCDR3が、配列番号16を含む、請求項1に記載の単離された抗体又はその抗原結合フラグメント。 - a)前記重鎖可変領域のCDR1が、配列番号3であり、
b)前記重鎖可変領域のCDR2が、配列番号4であり、
c)前記重鎖可変領域のCDR3が、配列番号5であり、
d)前記軽鎖可変領域のCDR1が、配列番号14であり、
e)前記軽鎖可変領域のCDR2が、配列番号15であり、かつ、
f)前記軽鎖可変領域のCDR3が、配列番号16である、請求項1~2のいずれか一項に記載の単離された抗体又はその抗原結合フラグメント。 - a)前記重鎖可変領域のCDR1が、配列番号6を含み、
b)前記重鎖可変領域のCDR2が、配列番号7を含み、
c)前記重鎖可変領域のCDR3が、配列番号8を含み、
d)前記軽鎖可変領域のCDR1が、配列番号17を含み、
e)前記軽鎖可変領域のCDR2が、配列番号18を含み、かつ、
f)前記軽鎖可変領域のCDR3が、配列番号19を含む、請求項1に記載の単離された抗体又はその抗原結合フラグメント。 - a)前記重鎖可変領域のCDR1が、配列番号6であり、
b)前記重鎖可変領域のCDR2が、配列番号7であり、
c)前記重鎖可変領域のCDR3が、配列番号8であり、
d)前記軽鎖可変領域のCDR1が、配列番号17であり、
e)前記軽鎖可変領域のCDR2が、配列番号18であり、かつ、
f)前記軽鎖可変領域のCDR3が、配列番号19である、請求項1又は4のいずれか一項に記載の単離された抗体又はその抗原結合フラグメント。 - a)前記重鎖可変領域のCDR1が、配列番号9を含み、
b)前記重鎖可変領域のCDR2が、配列番号10を含み、
c)前記重鎖可変領域のCDR3が、配列番号11を含み、
d)前記軽鎖可変領域のCDR1が、配列番号20を含み、
e)前記軽鎖可変領域のCDR2が、配列番号18を含み、かつ、
f)前記軽鎖可変領域のCDR3が、配列番号16を含む、請求項1に記載の単離された抗体又はその抗原結合フラグメント。 - a)前記重鎖可変領域のCDR1が、配列番号9であり、
b)前記重鎖可変領域のCDR2が、配列番号10であり、
c)前記重鎖可変領域のCDR3が、配列番号11であり、
d)前記軽鎖可変領域のCDR1が、配列番号20であり、
e)前記軽鎖可変領域のCDR2が、配列番号18であり、かつ、
f)前記軽鎖可変領域のCDR3が、配列番号16である、請求項1又は6のいずれか一項に記載の単離された抗体又はその抗原結合フラグメント。 - a)前記重鎖可変領域が、配列番号2のアミノ酸配列を含み、かつ、
b)前記軽鎖可変領域が、配列番号13のアミノ酸配列を含む、請求項1~7のいずれか一項に記載の単離された抗体又はその抗原結合フラグメント。 - 前記抗体が、モノクローナル抗体である、請求項1~8のいずれか一項に記載の単離された抗体又はその抗原結合フラグメント。
- 前記抗体が、ヒト化抗体である、請求項1~9のいずれか一項に記載の単離された抗体又はその抗原結合フラグメント。
- a)配列番号1の重鎖と、
b)配列番号12の軽鎖と、を含む、3pE Aβに結合する単離された抗体又はその抗原結合フラグメント。 - 請求項1~11のいずれか一項に記載の抗体を生成するハイブリドーマ。
- 請求項12に記載のハイブリドーマを使用することを含む、モノクローナル抗体を生成する方法。
- 請求項1~11のいずれか一項に記載の抗体又はその抗原結合フラグメントと、医薬的に許容される担体と、を含む、医薬組成物。
- β-アミロイドタンパク質を含有するプラークの形成に関連する状態を治療するための医薬組成物であって、請求項1~11のいずれか一項に記載の抗体又はその抗原結合フラグメントと、医薬的に許容される担体とを含む、医薬組成物。
- 前記状態が、アルツハイマー病である、請求項15に記載の医薬組成物。
- 前記状態が、トリソミー21(ダウン症候群)、びまん性レビー小体病、封入体筋炎、脳アミロイド血管症、及びオランダ型アミロイドーシスを伴う遺伝性脳出血(HCHWA-D)に関連する認知症からなる群から選択される、請求項15に記載の医薬組成物。
- アルツハイマー病に関連するプラークを減少させるための医薬組成物であって、請求項1~11のいずれか一項に記載の抗体又はその抗原結合フラグメントと、医薬的に許容される担体とを含む、医薬組成物。
- 3pE Aβのシーディング活性を阻害するための医薬組成物であって、請求項1~11のいずれか一項に記載の抗体又はその抗原結合フラグメントと、医薬的に許容される担体とを含む、医薬組成物。
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