JP2020505001A - 抗bcma重鎖のみ抗体 - Google Patents
抗bcma重鎖のみ抗体 Download PDFInfo
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- JP2020505001A JP2020505001A JP2019534110A JP2019534110A JP2020505001A JP 2020505001 A JP2020505001 A JP 2020505001A JP 2019534110 A JP2019534110 A JP 2019534110A JP 2019534110 A JP2019534110 A JP 2019534110A JP 2020505001 A JP2020505001 A JP 2020505001A
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Abstract
Description
本出願は、2016年12月21日出願の米国仮特許出願第62/437,588号の出願日の優先権を主張し、この出願の開示は、参照することによりその全体が本明細書に組み込まれる。
本出願は、ASCII形式で電子的に提出された配列表を含み、参照することによりその全体が本明細書に組み込まれる。2018年1月17日に作成された上記ASCIIコピーは、TNO−0002−WO_SL.txtという名称であり、46,768バイトのサイズである。
腫瘍壊死因子スーパーファミリーメンバー17(TNFRSF17)(UniProt Q02223)としても知られるBCMAは、形質細胞及び形質芽細胞上に排他的に発現される細胞表面受容体である。BCMAは腫瘍壊死因子(TNF)スーパーファミリーの2つのリガンド、APRIL(増殖誘導リガンド、TNFSF13、TALL−2、及びTRDL−1としても知られる、BCMAに対する高親和性リガンド)及びB細胞活性化因子(BAFF)(BLyS、TALL−1、THANK、zTNF4、TNFSF20、及びD8Ertd387eとしても知られる、BCMAに対する低親和性リガンド)に対する受容体である。APRIL及びBAFFは、BCMAに結合して形質細胞の生存を促進する増殖因子である。BCMAはまた、ヒト多発性骨髄腫(MM)の悪性形質細胞上で高度に発現される。BCMAに結合する抗体は、例えば、Gras et al.,1995,Int.Immunol.7:1093−1106、WO200124811及びWO200124812に記載されている。TACIと交差反応する抗BCMA抗体は、WO2002/066516に記載されている。BCMA及びCD3に対する二重特異性抗体は、例えば、US2013/0156769 A1及びUS2015/0376287 A1に記載されている。抗BCMA抗体−MMAEまたは−MMAFコンジュゲートは、多発性骨髄腫細胞の殺傷を選択的に誘導することが報告されている(Tai et al.,Blood 2014,123(20):3128−38)。Ali et al.,Blood 2016,128(13):1688−700は、臨床試験(#NCT02215967)で、BCMAを標的とするキメラ抗原受容体(CAR)T細胞がヒト患者において多発性骨髄腫の寛解をもたらしたことを報告している。
従来のIgG抗体では、重鎖と軽鎖との会合は、軽鎖定常領域と重鎖のCH1定常ドメインとの間の疎水性相互作用に一部起因している。重鎖と軽鎖との間のその疎水性相互作用にも寄与する、重鎖フレームワーク2(FR2)及びフレームワーク4(FR4)領域に追加の残基がある。
(a)配列番号1〜4の配列のうちのいずれかと少なくとも95%の配列同一性を有するCDR1、及び/または
(b)配列番号5〜18の配列のうちのいずれかと少なくとも95%の配列同一性を有するCDR2、及び/または
(c)配列番号19と少なくとも95%の配列同一性を有するCDR3を含む、重鎖可変領域を含む、重鎖のみ抗体に関する。
(a)配列番号1〜4からなる群から選択される配列、及び/または
(b)配列番号5〜18からなる群から選択されるCDR2配列、及び/または
(c)配列番号19のCDR3を含む。
(a)配列番号1〜4からなる群から選択されるCDR1配列と、
(b)配列番号5〜18からなる群から選択されるCDR2配列と、
(c)配列番号19のCDR3と、を含む。
(a)次式のCDR1配列
G F T F X1 X2 Y A
(式中、
X1が、SまたはTであり、
X2が、S、N、またはRである)、及び
(b)次式のCDR2配列
X3 X4 X5 X6 G X7 X8 X9
(式中、
X3が、IまたはLであり、
X4が、S、T、I、またはVであり、
X5が、GまたはEであり、
X6が、S、G、N、またはDであり、
X7が、G、D、またはAであり、
X8が、S、T、またはNであり、
X9が、TまたはSである)、及び
(c)配列番号19のCDR3を、
ヒトVHフレームワーク中に含む、重鎖可変領域を含む、重鎖のみ抗体に関する。
(a)配列番号1のCDR1、配列番号5のCDR2、及び配列番号19のCDR3、または
(b)配列番号2のCDR1、配列番号5のCDR2、及び配列番号19のCDR3を、
ヒトVHフレームワーク中に含む、重鎖可変領域を含む、重鎖のみ抗体に関する。
「含む」とは、列挙された要素が組成物/方法/キットに必要とされることを意味するが、請求項の範囲内で組成物/方法/キットなどを形成するために他の要素が含まれ得る。
抗BCMA抗体
本発明は、ヒトBCMAに結合する密接に関連した重鎖のみ抗体のファミリーを提供する。このファミリーの抗体は、本明細書に定義され、図1に示される一組のCDR配列を含み、図2に示される配列番号20〜53に提供される重鎖可変領域(VH)配列によって例示される。抗体のファミリーは、臨床的治療薬(複数可)としての有用性に寄与する多くの利点を提供する。抗体は、所望の結合親和性を有する特定の配列の選択を可能にする、ある範囲の結合親和性を有するメンバーを含む。
CDR1
G F T F X1 X2 Y A
(式中、
X1が、SまたはTであり、
X2が、S、N、またはRである)、
CDR2
X3 X4 X5 X6 G X7 X8 X9
(式中、
X3が、IまたはLであり、
X4が、S、T、I、またはVであり、
X5が、GまたはEであり、
X6が、S、G、N、またはDであり、
X7が、G、D、またはAであり、
X8が、S、T、またはNであり、
X9が、TまたはSである)。
本発明の別の態様は、適切な薬学的に許容される担体と混合した本発明の1つ以上の抗体を含む薬学的組成物を提供することである。本明細書で使用される薬学的に許容される担体は、限定されないが、アジュバント、固体担体、水、緩衝剤、または治療成分を保持するために当技術分野で使用される他の担体、またはそれらの組み合わせを例示する。
本明細書の薬学的組成物は、BCMAの発現を特徴とするB細胞関連障害を治療するために使用することができる。
重鎖のみ抗体を発現する遺伝子操作ラット
「ヒト−ラット」のIgH遺伝子座は、いくつかの部分に分けて構築され、組み立てられた。これは、ヒトJHの下流のラットC領域遺伝子の改変及び結合、ヒトVH6−D断片領域の上流付加が含まれた。ヒトVH遺伝子の別々の集団を有する2つのBAC[BAC6及びBAC3]は、ヒトVH6、全てのD、全てのJH、及び修飾されたラットCγ2a/1/2b(ΔCH1)を含む、組み立てられ修飾された領域をコードするGeorgと呼ばれるBACを同時注入した。
免疫
BCMAの組換え細胞外ドメインによる免疫。
12匹のUniRat動物(6匹のHC27、6匹のHC28)を組換えヒトBCMAタンパク質で免疫した。Titermax/Alhydrogelアジュバントを用いて標準的なプロトコルに従って動物を免疫した。BCMAの組換え細胞外ドメインは、R&D Systemsから購入し、滅菌生理食塩水で希釈し、そしてアジュバントと組み合わせた。免疫原をTitermax及びAlhydrogelアジュバントと組み合わせた。Titermax中の免疫原による初回免疫(プライミング)を左右の脚に投与した。その後の追加免疫をAlhydrogelの存在下で行い、採取3日前に追加免疫をPBS中の免疫原で行った。血清は、血清力価を決定するために最終採血時にラットから採取した。
血清力価概要情報を、図4及び5に示す。動物の半数について、単一の1:500血清力価希釈に対する結合活性は、真核細胞で産生されたhuBCMA+Fcタンパク質及びcynoBCMA+Fcタンパク質、ならびにそれぞれの大腸菌及び小麦胚芽由来の2つのヒトBCMAタンパク質に対してELISAにより試験した。さらに、血清試料を、2つの標的外タンパク質、HSA及びヒトIgG1に対して試験した。さらに、12匹全ての動物からの血清をNCI−H929細胞(BCMA+、ラムダ−)への結合についてアッセイした。
遺伝子構築、発現及び結合アッセイ
リンパ節細胞において高度に発現される重鎖のみ抗体をコードする309個のcDNAを遺伝子構築のために選択し、発現ベクターにクローニングした。続いて、それらの309個の重鎖配列を、UniAb重鎖のみ抗体(CH1欠失、軽鎖なし)としてHEK細胞に発現させた。試験した34個のVH領域のアミノ酸配列を含む結合結果は、BCMA_FAM2_DATAに見出すことができる。
(a)配列番号1〜4の配列のうちのいずれかと少なくとも95%の配列同一性を有するCDR1、及び/または
(b)配列番号5〜18及び54の配列のうちのいずれかと少なくとも95%の配列同一性を有するCDR2、及び/または
(c)配列番号19と少なくとも95%の配列同一性を有するCDR3を含む、重鎖可変領域を含む、重鎖のみ抗体に関する。
(a)配列番号1〜4からなる群から選択される配列、及び/または
(b)配列番号5〜18及び54からなる群から選択されるCDR2配列、及び/または
(c)配列番号19のCDR3を含む。
(a)配列番号1〜4からなる群から選択されるCDR1配列と、
(b)配列番号5〜18及び54からなる群から選択されるCDR2配列と、
(c)配列番号19のCDR3と、を含む。
(a)次式のCDR1配列
G F T F X1 X2 Y A(配列番号55)
(式中、
X1が、SまたはTであり、
X2が、S、N、またはRである)、及び
(b)次式のCDR2配列
X3 X4 X5 X6 G X7 X8 X9(配列番号56)
(式中、
X3が、IまたはLであり、
X4が、S、T、I、またはVであり、
X5が、GまたはEであり、
X6が、S、G、N、またはDであり、
X7が、G、D、またはAであり、
X8が、S、T、またはNであり、
X9が、TまたはSである)、及び
(c)配列番号19のCDR3を、
ヒトVHフレームワーク中に含む、重鎖可変領域を含む、重鎖のみ抗体に関する。
(a)配列番号1のCDR1、配列番号5のCDR2、及び配列番号19のCDR3、または
(b)配列番号2のCDR1、配列番号54のCDR2、及び配列番号19のCDR3を、
ヒトVHフレームワーク中に含む、重鎖可変領域を含む、重鎖のみ抗体に関する。
CDR1
G F T F X1 X2 Y A(配列番号55)
(式中、
X1が、SまたはTであり、
X2が、S、N、またはRである)、
CDR2
X3 X4 X5 X6 G X7 X8 X9(配列番号56)
(式中、
X3が、IまたはLであり、
X4が、S、T、I、またはVであり、
X5が、GまたはEであり、
X6が、S、G、N、またはDであり、
X7が、G、D、またはAであり、
X8が、S、T、またはNであり、
X9が、TまたはSである)。
Claims (28)
- ヒトB細胞成熟抗原(BCMA)に結合する重鎖のみ抗体であって、
(a)配列番号1〜4の配列のうちのいずれかと少なくとも95%の配列同一性を有するCDR1、及び/または
(b)配列番号5〜18の配列のうちのいずれかと少なくとも95%の配列同一性を有するCDR2、及び/または
(c)配列番号19と少なくとも95%の配列同一性を有するCDR3を含む、重鎖可変領域を含む、前記重鎖のみ抗体。 - 前記CDR1、CDR2、及びCDR3配列がヒトフレームワーク中に存在する、請求項1に記載の重鎖のみ抗体。
- CH1配列の非存在下で重鎖定常領域配列をさらに含む、請求項1に記載の重鎖のみ抗体。
- (a)配列番号1〜4からなる群から選択されるCDR1配列、及び/または
(b)配列番号5〜18からなる群から選択されるCDR2配列、及び/または
(c)配列番号19のCDR3を含む、請求項1〜3のいずれか1項に記載の重鎖のみ抗体。 - (a)配列番号1〜4からなる群から選択されるCDR1配列と、
(b)配列番号5〜18からなる群から選択されるCDR2配列と、
(c)配列番号19のCDR3とを含む、請求項4に記載の重鎖のみ抗体。 - 配列番号20〜53の配列のうちのいずれかと少なくとも95%の配列同一性を有する重鎖可変領域を含む、請求項1〜3のいずれか1項に記載の重鎖のみ抗体。
- 配列番号20〜53からなる群から選択される重鎖可変領域配列を含む、請求項6に記載の重鎖のみ抗体。
- ヒトB細胞成熟抗原(BCMA)に結合する重鎖のみ抗体であって、
(a)次式のCDR1配列
G F T F X1 X2 Y A
(式中、
X1が、SまたはTであり、
X2が、S、N、またはRである)、及び
(b)次式のCDR2配列
X3 X4 X5 X6 G X7 X8 X9
(式中、
X3が、IまたはLであり、
X4が、S、T、I、またはVであり、
X5が、GまたはEであり、
X6が、S、G、N、またはDであり、
X7が、G、D、またはAであり、
X8が、S、T、またはNであり、
X9が、TまたはSである)、及び
(c)配列番号19のCDR3を、
ヒトVHフレームワーク中に含む、重鎖可変領域を含む、前記重鎖のみ抗体。 - ヒトVHフレームワーク中にCDR1、CDR2、及びCDR3配列を含む重鎖可変領域を含む、ヒトB細胞成熟抗原(BCMA)に結合する重鎖のみ抗体であって、前記CDR配列が、配列番号1〜19からなる群から選択されるCDR配列と少なくとも95%の同一性を有する配列である、前記重鎖のみ抗体。
- ヒトVHフレームワーク中にCDR1、CDR2、及びCDR3配列を含む重鎖可変領域を含み、前記CDR配列が、配列番号1〜19からなる群から選択される、請求項9に記載の重鎖のみ抗体。
- ヒトB細胞成熟抗原(BCMA)に結合する重鎖のみ抗体であって、
(a)配列番号1のCDR1、配列番号5のCDR2、及び配列番号19のCDR3、または、
(b)配列番号2のCDR1、配列番号5のCDR2、及び配列番号19のCDR3を、ヒトVHフレームワーク中に含む、重鎖可変領域を含む、前記重鎖のみ抗体。 - 多重特異性である、請求項1〜11のいずれか1項に記載の重鎖のみ抗体。
- 二重特異性である、請求項12に記載の重鎖のみ抗体。
- 2つの異なるBCMAタンパク質に対する結合親和性を有する、請求項13に記載の重鎖のみ抗体。
- 同じBCMAタンパク質上の2つの異なるエピトープに対する結合親和性を有する、請求項13に記載の重鎖のみ抗体。
- エフェクター細胞に対する結合親和性を有する、請求項12に記載の重鎖のみ抗体。
- T細胞抗原に対する結合親和性を有する、請求項12に記載の重鎖のみ抗体。
- CD3に対する結合親和性を有する、請求項17に記載の重鎖のみ抗体。
- CAR−T形式である、請求項1〜15のいずれか1項に記載の重鎖のみ抗体。
- 請求項1〜19のいずれか1項に記載の重鎖のみ抗体を含む、薬学的組成物。
- BCMAの発現を特徴とするB細胞障害の治療のための方法であって、前記障害を有する対象に請求項1〜19のいずれか1項に記載の抗体または請求項20に記載の薬学的組成物を投与することを含む、前記方法。
- 前記B細胞障害が多発性骨髄腫である、請求項21に記載の方法。
- 前記B細胞障害が全身性エリテマトーデスである、請求項21に記載の方法。
- 請求項1〜19のいずれかに記載の抗体をコードする、ポリヌクレオチド。
- 請求項24に記載のポリヌクレオチドを含む、ベクター。
- 請求項25に記載のベクターを含む、細胞。
- 請求項1〜19のいずれかに記載の抗体を産生する方法であって、前記タンパク質の発現を許容する条件下で請求項26に記載の細胞を増殖させることと、前記細胞から前記抗体を単離することとを含む、前記方法。
- 請求項1〜19のいずれか1項に記載の抗体を作製する方法であって、UniRat動物をBCMAで免疫することと、BCMA結合重鎖配列を同定することとを含む、前記方法。
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