JP2013500258A - 放射性免疫複合体を生成するための方法 - Google Patents
放射性免疫複合体を生成するための方法 Download PDFInfo
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Abstract
【選択図】なし
Description
C(HuM195、mg/mL) = K280nm×Is×Df
K280nm 校正試料のUVのピーク(270nmに設定)の下の
面積(Ic)に対する、校正試料の中のHuM195の
濃度(mg/mL)の比率。
Ic 校正試料のSE−HPLC/UV(280nm)クロマ
トグラムのピークの下の面積(図2)。
Is 試料のSE−HPLC/UV(280nm)クロマトグ
ラムのピークの下の面積(図4)。
Df 希釈係数
C(HuM195、mg/mL) 希釈されていない試料中のHu
M195の濃度(mg/mL)。
* 複合体溶液は、280nmで吸収する遊離BFCまたは任意の他の物質を含有すべきではない(図1Bを参照されたい)
C(HuM195、mg/mL) = A280nm×Df×fc/ε280nm.L
A280nm 280nmでの吸光度
ε280nm 0.1%の場合の280nmでの減衰係数=1.4
L キュベットの光経路(1cm)
Df 希釈係数
fc 天然および複合体化されたIgGの減衰係数の差を修正
する係数。この係数は、280nmで約1である(図1を
参照されたい)
C(HuM195 conj、mg/mL) 希釈されていない試料中
のHuM195の濃度(mg/mL)
Y(%)=(A1+A2)×100%/At
式中、
Y= 放射性標識収率(%)
A1= クロマトグラムの切片1(最後から数える)において測定される225
Acの活性(Bq(μCi))
A2= クロマトグラムの切片2において測定される225Acの活性(Bq
(μCi))
At= クロマトグラムの全ての切片において測定される225Ac活性の合計
(Bq(μCi))
同じジオメトリ(線源〜検出器距離、同じバイアル、検出器等)を使用して試料を測定する場合、収率は、次式を使用して計算することができる。
Y(%)=(I1+I2)×100%/It
式中、
Y= 放射化学収率(%)
I1= クロマトグラムの切片1(最後から数える)において測定される225Acのカウント率(cps)
I2= クロマトグラムの切片2において測定される225Acのカウント率(cps)
It= クロマトグラムの全ての切片において測定される225Acのカウント率(cps)
Rc(%)=(Ic)×100%/It
式中、
Rc = 標識された複合体の放射化学的純度(%)
Ic = SE−HPLC/rad.クロマトグラム上の複合体ピークの下側で測定される面積(図6)。
It = SE−HPLC/rad.クロマトグラム上で測定される総面積(図6)。
次式を使用して、Ac−225が関連する高分子量凝集体の割合を計算する。
AH(%)=(Ih)×100%/It
式中、
AH = 高分子量凝集体(%)と関連するAc−225の割合(%)。
Ih = SE−HPLC/放射能クロマトグラム上の複合体ピークの左側で測定される面積。
次式を使用して、Ac−225が関連する低分子量凝集体の割合を計算する。
AL(%)=(Il)×100%/It
式中、
AL = 低分子量凝集体の割合と関連するAc−225の割合(%)。
It = 遊離Ac−225に対応するピークが始まるまで、複合体ピークの右側で測定される面積(図6)。
Meares C. F., McCall M. J., Rearan D. T., Goodwin D. A., Diamanti C. I., McTigue M. (1984) Conjugation of antibodies with bifunctional chelating agents: isothiocyanate and bromoacetamide reagents, methods of analysis and subsequent addition of metal ions. Anal Biochem; 142:68-78.
Shrikant V. D., Sally J. D., David L. K., Min K. M., Michael J. Mc., Gerald L.D. y Meares C. F. (1990) Yttrium-90-Labeled monoclonal antibody for therapy: Labeling by new macrocyclic bifunctional chelating agent. J Nucl Med. 31, 473-479.
Michael R. Lewis, Andrew Raubitschek and John E. Shively. (1994) A Facile, Water-Soluble Method for Modification of Proteins with DOTA. Use of Elevated Temperature and Optimized pH To Achieve High Specific Activity and High Chelate Stability in Radiolabeled Immunoconjugates. Bioconjugafe Chem. 5, 565-576.
D. R. Beckford, A. Xiques, R. Leyva, M. Perez-Malo; E. Casanova, M. Barrabi (2007) Nuevo radioimmunoconjugado 90Y-DOTA-HR3 Sintesis y radiomarcaje. Nucleus 2007, 41, 3-8.
Michael R. L., Jim Y. K., Anne-Line J. A., John E. S., and Andrew R. (2001) An improved method for conjugating monoclonal antibodies with N-hidroxysulfosuccinimimidyl DOTA. Bioconjugate Chem . 12, 320-324.
Yasushi Ogawa, Joseph Traina, Eike Zimmermann, Tao Yu, Douglas W. Schneider, Erno Pungor Jr. (2007) Quantification of bifunctional diethyenetriaminepentaccetic acid derivative conjugation to monoclonal antibodies by matrix-assisted laser desorption/ionization time of flight mass spectrometry. Analytical Biochemistry 368 214-221.
Sharon X. Lu, Edward J. Takach, Marjorie Solomon, Qing Zhu, Say-Jong Law, Frank Y. Hsieh (2005) Mass Spectral Analyses of Labile DOTA-HNS and Heterogeneity Determination of DOTA or DM1 Conjugated Anti-PSMA Antibody for Prostate Cancer Therapy. Journal of Pharmaceutical Sciences, Vol. 94, No 4, April 2005.
Instructions 52-1308-00 BB: PD-10 Desalting Column, GE Healthcare.
Amicon Centricon Centrifugal Filter Devices. Data sheet Millipore
[Ac-225]-DOTA-Hum195 Manufacturing Protocol (Two step labelling procedure), MSKCC
Labelling of Hum-195/DOTA conjugates with Ac - 225 using the one step method, TUM report, February 2009.
Claims (35)
- アクチニウム−225(Ac−225)放射性複合体を生成するための方法であって、
(a)複合体化反応混合物中でキレート剤を生体分子に複合体化して複合体化された生体分子を産生するステップと、
(b)前記反応混合物を精製して複合体化されていないキレート剤を除去するステップと、
(c)キレート化反応混合物中で、1つ以上のAc−225放射性核種を前記複合体化された生体分子でキレート化してAc−225放射性複合体を産生するステップと、
を含む、方法。 - 前記ステップ(a)における複合体化は、前記複合体化反応混合物を約37℃で約1.5時間インキュベートすることを含む、請求項1に記載の方法。
- 前記ステップ(a)における複合体化は、前記複合体化反応混合物を約16℃〜約20℃で約24時間インキュベートすることを含む、請求項1に記載の方法。
- 前記精製は、前記複合体化反応混合物をフィルタを通して濾過して前記複合体化された生体分子を精製するステップを含む、請求項1に記載の方法。
- 前記複合体化反応混合物は、重炭酸塩緩衝液を含む、請求項1に記載の方法。
- 前記複合体化反応混合物は、リン酸緩衝液を含む、請求項1に記載の方法。
- 前記複合体化反応混合物は、約8.0〜約9.2のpHを有する、請求項1に記載の方法。
- 前記濾過は、HEPES緩衝液中で行われる、請求項1に記載の方法。
- 前記濾過は、NaAc緩衝液中で行われる、請求項1に記載の方法。
- 前記濾過は、少なくとも約10,000Da、少なくとも約20,000Da、または少なくとも約40,000Daの分画分子量を含む、請求項1に記載の方法。
- 前記キレート化反応混合物は、ゲンチシン酸またはアスコルビン酸を含む、請求項1に記載の方法。
- 前記キレート化反応混合物は、約5.5〜約7.0のpHを有する、請求項1に記載の方法。
- 前記ステップ(c)におけるキレート化は、前記1つ以上のAc−225放射性核種を、前記複合体化された生体分子とともに約37℃で約1.5時間インキュベートすることを含む、請求項1に記載の方法。
- 末端キレート化剤を前記キレート化反応混合物に加えるステップをさらに含む、請求項1に記載の方法。
- 前記末端キレート化剤は、ジエチレントリアミン五酢酸(DTPA)である、請求項14に記載の方法。
- 前記末端キレート化剤を加える前記ステップの後に、前記キレート化反応混合物を約37℃で約30分間インキュベートするステップをさらに含む、請求項14に記載の方法。
- 前記生体分子は、タンパク質、ペプチド、ポリヌクレオチド、それらの組み合わせ、またはそれらの誘導体を含む、請求項1に記載の方法。
- 前記生体分子は、抗体、その抗原結合断片、抗体の抗原結合ポリペプチド配列を含む一本鎖タンパク質、単一ドメイン抗体、前述したもののうちのいずれかの類似体、または前述したもののうちのいずれかの誘導体である、請求項1に記載の方法。
- 前記抗原結合断片は、モノクローナル抗体可変領域である、請求項18に記載の方法。
- 前記生体分子は、抗体の抗原結合配列を含むタンパク質である、請求項1に記載の方法。
- 前記生体分子は、細胞表面上の抗原に結合する抗体の抗原結合配列を含む、天然に、合成的に、または、組み換え的に生成されたタンパク質である、請求項1に記載の方法。
- 標的細胞表面上の前記抗原は、CD33である、請求項21に記載の方法。
- 前記生体分子は、HuM195である、請求項1に記載の方法。
- 前記放射性複合体は、放射性免疫複合体である、請求項1に記載の方法。
- 前記キレート剤は、二官能性キレート剤である、請求項1に記載の方法。
- 前記二官能性キレート剤は、S−2−(4−イソチオシアナトベンジル)−1,4,7,10−テトラアザシクロドデカン四酢酸(p−SCN−Bn−DOTA)である、請求項25に記載の方法。
- 前記キレート剤は、ジエチレントリアミン五酢酸(「DTPA」)、1,4,7,10−テトラアザシクロドデカン−N,N´,N´´,N´´´−四酢酸(「DOTA」)、p−イソチオシアナトベンジル−1,4,7,10−テトラアザシクロドデカン−1,4,7,10−四酢酸(「pSCN−Bz−DOTA」)、1,4,7,10−テトラアザシクロドデカン−N,N´,N´´−三酢酸(「DO3A」)、1,4,7,10−テトラアザシクロドデカン−1,4,7,10−テトラキス(2−プロピオン酸)(「DOTMA」)、3,6,9−トリアザ−12−オキサ−3,6,9−トリカルボキシメチレン−10−カルボキシ−13−フェニル−トリデカン酸(「B−19036」)、1,4,7−トリアザシクロノナン−N,N´,N´´−三酢酸(「NOTA」)、1,4,8,11−テトラアザシクロテトラデカン−N,N´,N´´,N´´´−四酢酸(「TETA」)、トリエチレンテトラアミン六酢酸(「TTHA」)、トランス−1,2−ジアミノヘキサン四酢酸(「CYDTA」)、1,4,7,10−テトラアザシクロドデカン−1−(2−ヒドロキシプロピル)4,7,10−三酢酸(「HP−DO3A」)、トランス−シクロヘキサン−ジアミン四酢酸(「CDTA」)、トランス(1,2)−シクロヘキサンジエチレントリアミン五酢酸(「CDTPA」)、1−オキサ−4,7,10−トリアザシクロドデカン−N,N´,N´´−三酢酸(「OTTA」)、1,4,7,10−テトラアザシクロドデカン−1,4,7,10−テトラキス{3−(4−カルボキシル)−ブタン酸}、1,4,7,10−テトラアザシクロドデカン−1,4,7,10−テトラキス(酢酸−メチルアミド)、1,4,7,10−テトラアザシクロドデカン−1,4,7,10−テトラキス(メチレンホスホン酸)、2,2´,2´´−(10−(2−(2,5−ジオキソピロリジン−1−イルオキシ)−2−オキソエチル)−1,4,7,10−テトラアザシクロドデカン−1,4,7−トリイル)三酢酸(DOTA−NHSエステル)、ならびにそれらの誘導体、類似体、および混合物から成る化合物の群より選択される、請求項1に記載の方法。
- [Ac−225]−p−SCN−Bn−DOTA/HuM195放射性免疫複合体を生成するための方法であって、
(a)p−SCN−Bn−DOTAを、約37℃で約1.5時間、重炭酸塩緩衝液を含み、かつ約8.0〜約9.2のpHを有する複合体化反応混合物中で、HuM195抗体に複合体化してp−SCN−Bn−DOTA/HuM195免疫複合体を産生するステップと、
(b)少なくとも約10,000Da、少なくとも約20,000Da、または少なくとも約40,000Daの分画分子量を有するフィルタを通して、前記複合体化反応混合物を濾過して前記p p−SCN−Bn−DOTA/HuM195免疫複合体を精製するステップであって、前記濾過するステップは、HEPES緩衝液またはNaAc緩衝液を用いて行われる、ステップと、
(c)1つ以上のアクチニウム−225放射性核種を、約37℃で約1.5時間、ゲンチシン酸を含み、かつ約5.5〜約7.0のpHを有するキレート化反応混合物中で、前記p−SCN−Bn−DOTA/HuM195免疫複合体でキレート化して[Ac−225]−p−SCN−Bn−DOTA/HuM195放射性免疫複合体を産生するステップと、
(d)DTPAを前記キレート化反応混合物に加えるステップと、
(e)前記キレート化反応混合物を約37℃で約30分間インキュベートするステップと、
を含む、方法。 - 前記ステップ(b)の濾過の前に、サイズ排除樹脂を通してのサイズ排除クロマトグラフィのステップをさらに含む、請求項1または請求項28に記載の方法。
- 前記サイズ排除樹脂は、約5,000Daのサイズ排除制限を有する、請求項29に記載の方法。
- サイズ排除樹脂を通してのサイズ排除クロマトグラフィによって、前記放射性複合体を精製することをさらに含む、請求項1に記載の方法。
- サイズ排除樹脂を通してのサイズ排除クロマトグラフィによって、前記[Ac−225]−p−SCN−Bn−DOTA/HuM195放射性免疫複合体を精製することをさらに含む、請求項28に記載の方法。
- 前記サイズ排除樹脂は、約6,000Daのサイズ排除制限を有する、請求項31または32に記載の方法。
- 前記サイズ排除樹脂は、約5,000Daのサイズ排除制限を有する、請求項31または32に記載の方法。
- 請求項1または請求項28に記載の方法によって生成される、Ac−225放射性免疫複合体。
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