JP2021501589A - 新規操作t細胞受容体およびそれを使用した免疫療法 - Google Patents
新規操作t細胞受容体およびそれを使用した免疫療法 Download PDFInfo
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Abstract
Description
a.適切な宿主細胞を提供するステップと、
b.請求項1〜4のいずれか一項に記載の抗原認識コンストラクトをコ-ドするコ-ド配列を含んでなる、遺伝子コンストラクトを提供するステップと、
c.前記遺伝子コンストラクトを前記適切な宿主細胞に導入するステップと、
d.前記適切な宿主細胞によって前記遺伝子コンストラクトを発現させるステップとを含んでなる、細胞株を発現するCOL6A3特異的抗原認識コンストラクトを製造する方法によっても解決される。
b)細胞を本発明の抗原認識コンストラクトをコ-ドする少なくとも1つのベクタ-で形質転換して、形質転換細胞を生成するステップと;
c)形質転換細胞を増殖させて、複数の形質転換細胞を生成するステップと;
d)複数の形質転換細胞を前記対象に投与するステップと
を含んでなる、それを必要とする対象においてがんを治療する方法もまた提供される。
b)細胞を本発明の抗原認識コンストラクトをコ-ドするベクタ-で形質転換して、形質転換細胞を生成するステップと;
c)形質転換細胞を増殖させて、複数の形質転換細胞を生成するステップと;
d)複数の形質転換細胞を前記対象に投与するステップと
を含んでなる、それを必要とする対象においてがんを治療する方法もまた提供される。
b)抗原認識コンストラクトの生物学的サンプルへの結合を検出するステップと
を含んでなる、生物学的サンプルにおいてがんを検出する方法もまた提供される。
(Francois Ehrenmann, Patrice Duroux, Chantal Ginestoux; タンパク質提示: ヒト (Homo sapiens) TRAV; IMGT Repertoire. IMGT登録商標, the international ImMunoGenetics information system登録商標 http://www.imgt.org.; 作成日: 16/03/2011. バ-ジョン: 03/06/2016; Francois Ehrenmann, Patrice Duroux, Chantal Ginestoux; タンパク質提示: ヒト (Homo sapiens) TRBV; IMGT Repertoire. IMGT登録商標, the international ImMunoGenetics information system登録商標 http://www.imgt.org.; 作成日: 16/03/2011. バ-ジョン: 03/06/2016)。)
本発明では、酵母表面ディスプレイを介した成熟のために、可変α(配列番号4)およびβ(配列番号12)ドメインと、それぞれの定常ドメイン(配列番号9および17)および適切なグリシン-セリンリンカ-配列の付属肢との組み合わせによって、以前に調査されたTCR R4P3F9(配列番号2および10)を単鎖TCRコンストラクト(scTv、配列番号22)に変換した。pCT302に基づくリ-ダ-配列とAga2p酵母接合タンパク質(配列番号20)とを含有する酵母ディスプレイベクタ-と共に、対応する配列のDNAを合成し、サッカロミセス・セレビシエ(Saccharomyces cerevisiae)EBY100(MATa AGA1::GAL1-AGA1::URA3 ura3-52 trp1 leu2-delta200 his3-delta200 pep4::HIS3 prbd1.6R can1 GAL)(ATCC(登録商標)MYA-4941(商標))に形質転換した(Boder et al.2000)。酵母における相同組換え後に得られた融合タンパク質(配列番号19)は、目的のタンパク質の提示に関与する、Aga2pタンパク質のN末端のリ-ダ-ペプチド(Boder et al.1997)と、発現制御のためのリンカ-配列(配列番号21および23)と、目的のタンパク質、すなわちscTvR4P3F9(配列番号22)またはその変異型を含む短いペプチドタグとを含有する独国特許第102016121899号明細書に記載されるように形質転換を実施し、ライブラリ-あたり最大109の酵母クロ-ンを得た。ライブラリは、scTv R4P3F9の全遺伝子配列に広がるランダム変異PCRアプロ-チを通じて生成した。
HLA-A*02/COL6A3-002への結合親和性がより高いscTv分子を生成するために、安定化変異aG29R、bQ43K、およびbL72Sを発現する、以前に同定された安定化scTv R4P3F9Sスキャフォ-ルド(配列番号27)を使用して、CDRb1(配列番号13)を変性させた。CDRb1残基は、本質的に以前記載されたように(Smith et al.,2015)、縮重DNAオリゴプライマ-を使用することによってランダム化した。得られたDNAライブラリ-は、実施例1に記載されるように形質転換した。scTv結合選択性を保持するために、COL6A3-002ペプチドとの高い配列類似性を示す正常組織由来のペプチド(配列番号28〜36)を含んでなるHLA-A*02四量体に対して、ネガティブ選択を採用した。
HLA-A*02/COL6A3-002に対する安定化および親和性成熟scTvは、CD3に対する抗体部分と融合して発現され得て、それらの天然特異性とは無関係に、腫瘍特異的再標的化およびT細胞活性化を可能にする。本発明者らは、scTv R4P3F9S変異型(配列番号50、64、65、および66)および抗CD3Fab(UCHT1)軽鎖(配列番号52)に融合した、抗CD3Fab(UCHT1)重鎖(配列番号51)を含んでなる、二重特異性抗体-TCR融合タンパク質を作製した。得られたFab-scTv融合タンパク質は、およそ75kDaの分子量を有する。scTv R4P3F9Sα鎖(配列番号5および26)およびβ鎖(配列番号13および37〜49)の異なるCDR1配列に基づいて、製造業者によって推奨されるように、異なるFab-scTv融合変異型(75-1〜75-25、表2)を一過性に形質移入されたExpiCHO細胞において発現させた。タンパク質は、プロテインLおよびサイズ排除クロマトグラフィ-によって精製した。全ての融合変異型は、80μgから1mgに至る収量(表2)で、サイズ排除クロマトグラフィ-によって分析された予想サイズの均一に形成されたヘテロ二量体(図3)で生成し得た。
COL6A3-002または異なる類似ペプチドを有するHLA-A*02モノマ-に対する抗CD3-scTv R4P3F9S融合タンパク質の結合親和性をバイオレイヤ-干渉法によって測定した。製造業者によって推奨される設定を使用して、Octet RED384システムで測定を行った。簡潔に述べると、HLA-A*02/COL6A3-002の連続希釈液を分析する前に、精製されたFab-scTv分子をバイオセンサ-(FAB2G)に負荷した。野生型CDRa1および野生型CDRb1を含んでなる変異型75-1および75-24と比較して、成熟CDRa1および/またはCDRb1配列を有するFab-scTv変異型では、最大40倍の結合親和性の増加が観察された(表3、図4)。HLA-A*02/COL6A3-002への結合の選択性を評価するために、それぞれがHLA-A*02と複合体形成した1μM類似ペプチド(配列番号28〜36)への結合について、FAB2Gバイオセンサ-上に負荷された精製Fab-scTv分子をスクリ-ニングした。成熟CDRa1(配列番号26)を含有するFab-scTv変異型のほとんどによって結合されたHLA-A*02/COL6A1-001(配列番号30)を除き、Fab-scTv変異型は、高い結合選択性を主張する類似ペプチドへの結合(図5)を示さなかった。一部のFab-scTv変異型では、ビオチン化ペプチド-HLA複合体をバイオセンサ-(SA)上に負荷し、Fab-scTv変異型の希釈系列を分析することによって、HLA-A*02/COL6A3-002とHLA-A*02/COL6A1-001の結合の間の治療濃度域を調査した。成熟CDRa1(配列番号26)および野生型CDRb1(配列番号13)配列を含んでなる変異型75-10が、HLA-A*02/COL6A1-001よりもHLA-A*02/COL6A3-002に対する結合親和性が8倍増加したことを示した一方で、成熟CDRb1(配列番号39)を含んでなるFab-scTv変異型75-13について、治療濃度域の改善を主張する、結合親和性の最大57倍の増加が検出された(表4、図6)。
腫瘍特異的ペプチドHLAを認識するTCRを発現するためのT細胞の修飾は、T細胞をがん細胞にリダイレクトする有望な代替法である。成熟CDR1配列の使用によって、HLA-A*02/COL6A3-002に対する細胞結合TCRを改善できることから、同定されたCDRa1およびCDRb1変異体配列を親TCRR4P3F9(配列番号2および10)上にグラフトした。得られた変異体TCR変異型(C-1からC-18、表5)は、PCR増幅DNAコンストラクトの生体外転写によって生成されたそれぞれのmRNAの電気穿孔後に、ヒトCD8+T細胞中で発現させた。対照の目的で、NYESO1-001ペプチド(配列番号61)に対する1G4 TCR(配列番号53および57)を発現させた。RNA電気穿孔されたCD8+T細胞を一晩インキュベ-トした後に、PE標識HLA-A*02/COL6A3-002四量体またはHLA-A*02/NYESO1-001四量体で染色することによって、導入されたTCR変異型の発現を分析した。親TCRR4P3F9変異型C-1は、HLA-A*02/COL6A3-002四量体で最小限の染色のみを示したが、成熟CDRa1および/またはCDRb1を有するR4P3F9 TCR変異型C-2〜C-18は、四量体染色の増加を示した(図7)。COL6A3-002の希釈系列(配列番号1)または10μMのCOL6A3-002および類似ペプチド(配列番号28〜36)のいずれかが負荷された、T2細胞との共培養(20,000細胞/ウェル)に際して放出されたIFN-γのレベルを判定することによって、異なる成熟R4P3F9TCR変異型を発現するCD8+T細胞(20,000細胞/ウェル)の機能的活性化を調査した。親R4P3F9 TCR変異型C-1と比較して、成熟TCR変異型C-2〜C-18はIFN-γ放出の増加を示し、より低いペプチド濃度で、既に最大濃度に達した(図8)。予測されたように、TCRを発現しないT細胞またはNYESO1-001に特異的な1G4対照TCRでは、IFN-γ放出は観察されなかった。成熟R4P3F9 TCR変異型のCOL6A3-002認識の選択性を分析するために、異なる類似ペプチド(配列番号28〜36)が負荷されたT2細胞に応答したIFN-γ放出を分析し、成熟R4P3F9 TCR変異型に対する異なる選択性プロファイルを明らかにした。最も興味深いことに、同一成熟CDRb1(配列番号40)を含んでなるTCR変異型C-5(配列番号62および2)およびC-14(配列番号62および63)は、COL6A1-001またはその他の類似ペプチド(図9)に対するいかなる交差反応性も示さず、親和性成熟R4P3F9TCR変異型C-5およびC14を細胞TCRベ-スの腫瘍標的化の最も有望な候補にする。
R4P3F9変異型の細胞発現および分析は、上述したように実施した。先の実験(図7)に従って、R4P3F9 TCR変異型C-2〜C-18を発現するT細胞のPE標識HLA-A*02/COL6A3-002四量体での染色は、親TCR C-1と比較して増加した。さらに、TCR変異型C-12およびC-17は、HLA-A*02/COL6A1-001への結合を示した(図10)。成熟R4P3F9変異型の発現によって、COL6A3-002(配列番号1)の希釈系列が負荷されたT2細胞に応答した、CD8+T細胞の機能的活性化が改善し、親TCRC-1と比較して5〜90倍低いEC50値に達した(図11、表6)。最も低いEC50値は、変異型C-14で認められた。この場合も、同一成熟CDRb1(配列番号40)を含んでなるTCR変異型C-5(配列番号62および2)およびC-14(配列番号62および63)は、COL6A1-001に対して交差反応性を示さなかった一方で、その他の変異型は、EC50ウィンドウ(COL6A3-002対COL6A1-001)で5倍の強力な認識を示した。
R4P3F9変異型の細胞発現および分析は、上述したように実施した。
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DE102016121899.5
DE102016115246
Claims (18)
- 配列番号5(CDRa1)、6(CDRa2)、および7(CDRa3)に記載のアミノ酸配列を含んでなる、3つの相補性決定領域(CDR)を含んでなる第1のドメインと、配列番号13(CDRb1)、14(CDRb2)、および15(CDRb3)に記載のアミノ酸配列を含んでなる、3つの相補性決定領域(CDR)を含んでなる第2のドメインとを含んでなる、抗原認識コンストラクトであって、前記相補性決定領域の少なくとも1つが、
a)配列番号26(CDRa1変異体1)および配列番号37〜49(CDRb1-mut1〜CDRb1-mut13)、および
b)配列番号26および配列番号37〜49の少なくとも1つを含んでなる変異配列からなる群から選択されるアミノ酸配列
の群から選択されるアミノ酸配列の少なくとも1つで置換され、前記少なくとも1つのアミノ酸配列が、1つ、2つ、または3つのアミノ酸置換を含有する、抗原認識コンストラクト。 - 前記抗原認識コンストラクトが安定であり、特にMHCに関する文脈で、特に配列番号1に記載のアミノ酸配列を含んでなるCOL6A3抗原ペプチドに、特異的および/または選択的に結合できる、請求項1に記載の抗原認コンストラクト。
- 前記抗原認識コンストラクトが、抗体、または二重特異性分子または断片などのその誘導体であり、またはT細胞受容体(TCR)、または二重特異性分子または断片などのその誘導体である、請求項1または2に記載の抗原認識コンストラクト。
- 前記第1のドメインがTCRαまたはγ鎖の一部であり、および/または前記第2のドメインがTCRβまたはδ鎖の一部である、請求項1〜3のいずれか一項に記載の抗原認識コンストラクト。
- 請求項1〜4のいずれか一項に記載の抗原認識コンストラクトをコ-ドする核酸、または前記核酸を含んでなる核酸ベクタ-。
- 請求項1〜4のいずれか一項に記載の抗原認識コンストラクト、または請求項5に記載の核酸またはベクタ-を含んでなる組換え宿主細胞であって、好ましくは、a)Tリンパ球などのリンパ球、または例えば、CD4+またはCD8+T細胞などのTリンパ球始原細胞、またはb)チャイニ-ズハムスタ-卵巣(CHO)細胞などの非リンパ球である、組換え宿主細胞。
- 請求項1〜4のいずれか一項に記載の抗原認識コンストラクト、または請求項5に記載の核酸もしくはベクタ-、または請求項6に記載の宿主細胞、および薬学的に許容可能な担体、希釈剤、安定剤および/または賦形剤を含んでなる、医薬組成物。
- a.適切な宿主細胞を提供するステップと、
b.請求項1〜4のいずれか一項に記載の抗原認識コンストラクトをコ-ドするコ-ド配列を含んでなる、遺伝子コンストラクトを提供するステップと、
c.前記遺伝子コンストラクトを前記適切な宿主細胞に導入するステップと、
d.前記適切な宿主細胞によって前記遺伝子コンストラクトを発現させるステップと
を含んでなる、請求項1〜4のいずれか1項に記載のCOL6A3特異的抗原認識コンストラクトを生成する方法。 - 前記抗原認識コンストラクトを前記適切な宿主細胞から単離し精製するステップと、任意選択的に、前記抗原認識コンストラクトをT細胞中で再構成するステップとをさらに含んでなる、請求項8に記載の方法。
- 医療で使用するための、請求項1〜4のいずれか一項に記載の抗原認識コンストラクト、請求項5に記載の核酸またはベクタ-、請求項6に記載の宿主細胞、または請求項7に記載の医薬品組成物。
- がんなどの増殖性疾患の診断、予防、および/または治療で使用するための、請求項1〜4のいずれか一項に記載の抗原認識コンストラクト、請求項5に記載の核酸またはベクタ-、請求項6に記載の宿主細胞、または請求項7に記載の医薬品組成物。
- 前記がんが、例えば、結腸直腸がん、結腸がん、肝臓がん、卵巣がん、および胃がんなど、COL6A3が過剰発現され、変異し、および/またはCOL6A3由来の腫瘍関連抗原が提示されるがんから選択される、請求項11に記載の使用のための、請求項1〜4のいずれか一項に記載の抗原認識コンストラクト、請求項5に記載の核酸またはベクタ-、請求項6に記載の宿主細胞、または請求項7に記載の医薬品組成物。
- 前記変異配列が、前記第1の配列中の1つ、2つまたは3つのアミノ酸を前記第2の配列中の対応する1つ、2つまたは3つのアミノ酸で置換することによって提供されるような、第1および第2のアミノ酸配列の組み合わせである、請求項1〜4のいずれか一項に記載の抗原認識コンストラクト。
- 前記変異配列が、前記第13の配列中の1つ、2つまたは3つの連続的アミノ酸を前記第2の配列中の対応する1つ、2つまたは3つの連続的アミノ酸で置換することによって提供されるような、第1および第2のアミノ酸配列の組み合わせである、請求項13に記載の抗原認識コンストラクト。
- (b)の変異配列が、少なくとも1つの(a)のアミノ酸配列と比較して、少なくとも1つの保存的アミノ酸置換を含有する、請求項1〜4および13〜14のいずれか一項に記載の抗原認識コンストラクト。
- 前記相補性決定領域の前記少なくとも1つが、配列番号40で置換され、配列番号40が、1つ、2つ、または3つのアミノ酸置換を含有する、請求項1〜4のいずれか一項に記載の抗原認識コンストラクト。
- 前記相補性決定領域の前記少なくとも1つが、配列番号40で置換される、請求項1〜4のいずれか一項に記載の抗原認識コンストラクト。
- 表2の75-1〜75-25および表5のC-1〜C-18からなる群から選択される変異型を含んでなる、請求項1〜4のいずれか一項に記載の抗原認識コンストラクト。
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