JPWO2020247820A5 - - Google Patents

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JPWO2020247820A5
JPWO2020247820A5 JP2021572418A JP2021572418A JPWO2020247820A5 JP WO2020247820 A5 JPWO2020247820 A5 JP WO2020247820A5 JP 2021572418 A JP2021572418 A JP 2021572418A JP 2021572418 A JP2021572418 A JP 2021572418A JP WO2020247820 A5 JPWO2020247820 A5 JP WO2020247820A5
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drug
human
sirpα
assay
reagent
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Pending
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JP2021572418A
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JP2022535286A (en
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Priority claimed from PCT/US2020/036425 external-priority patent/WO2020247820A1/en
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Claims (8)

試薬赤血球(RBC)または試薬血小板を使用する輸血前の血清学的アッセイにおける薬物干渉を低減する方法であって、
(a)薬物に結合し、かつ前記試薬RBCまたは前記試薬血小板の薬物の結合をブロックする薬物中和剤を、前記薬物による治療を受けた対象由来の血漿試料へ添加することと、
(b)前記試薬RBCまたは前記試薬血小板を使用して、ステップ(a)の後に前記血漿試料の前記血清学的アッセイを実行することと、を含み、
前記薬物は、(i)ヒト抗体Fc領域、及び(ii)ヒトCD47に結合する部分を含み、
ヒトCD47に結合する前記薬物の部分が、
(1)膜貫通ドメインを欠く野生型SIRPα、または
(2)野生型SIRPαの細胞外ドメインと比較して、1つ以上のアミノ酸置換(複数可)、欠失(複数可)、挿入(複数可)、N末端付加(複数可)及び/またはC末端付加(複数可)を含み、ヒトCD47に結合することができ、かつ膜貫通ドメインを欠く、SIRPαバリアント
を含み、
前記薬物中和剤が、抗SIRPα抗体であるか、またはヒトCD47に結合する前記部分に結合することができるその抗原結合フラグメントである、前記方法。
1. A method of reducing drug interference in a pre-transfusion serological assay using reagent red blood cells (RBCs) or reagent platelets, comprising:
(a) adding to a plasma sample from a subject treated with the drug a drug-neutralizing agent that binds the drug and blocks binding of the drug to the reagent RBCs or the reagent platelets;
(b) performing said serological assay of said plasma sample after step (a) using said reagent RBCs or said reagent platelets;
said drug comprises (i) a human antibody Fc region and (ii) a portion that binds to human CD47 ;
the portion of the drug that binds to human CD47
(1) wild-type SIRPα lacking a transmembrane domain, or
(2) one or more amino acid substitution(s), deletion(s), insertion(s), N-terminal addition(s) and/or C compared to the extracellular domain of wild-type SIRPα A SIRPα variant comprising terminal addition(s), capable of binding human CD47, and lacking a transmembrane domain
including
The above method, wherein the drug-neutralizing agent is an anti-SIRPα antibody or an antigen-binding fragment thereof capable of binding to the portion that binds to human CD47.
赤血球(RBC)及び/または血小板を含有する血液試料の輸血前の血清学的アッセイにおける薬物干渉を低減する方法であって、 1. A method of reducing drug interference in pre-transfusion serological assays of blood samples containing red blood cells (RBCs) and/or platelets, comprising:
(a)薬物による治療を受けた対象の由来の前記血液試料に、抗SIRPα抗体またはその抗原結合フラグメントを追加することと、 (a) adding an anti-SIRPα antibody or antigen-binding fragment thereof to said blood sample from a subject who has been treated with a drug;
(b)ステップ(a)の後に、試薬血漿/抗血清を使用した前記血液試料の前記血清学的アッセイを実行することと (b) after step (a), performing said serological assay of said blood sample using reagent plasma/antiserum;
を含み、including
前記薬物は、(i)ヒト抗体Fc領域、及び(ii)ヒトCD47に結合する野生型SIRPαまたはそのバリアントの細胞外ドメインを含み、SIRPαバリアントは、野生型SIRPαの細胞外ドメインと比較して、1つ以上のアミノ酸置換(複数可)、欠失(複数可)、挿入(複数可)、N末端付加(複数可)及び/またはC末端付加(複数可)を含み、ヒトCD47に結合することができ、かつ膜貫通ドメインを欠き、 The drug comprises (i) a human antibody Fc region, and (ii) an extracellular domain of wild-type SIRPα or a variant thereof that binds to human CD47, wherein the SIRPα variant, compared to the extracellular domain of wild-type SIRPα, comprising one or more amino acid substitution(s), deletion(s), insertion(s), N-terminal addition(s) and/or C-terminal addition(s) and binding to human CD47 and lacks a transmembrane domain,
抗SIRPα抗体またはその抗原結合フラグメントは、血液試料中のRBCの表面でCD47に結合した薬物を置換する、前記方法。 The above method, wherein the anti-SIRPα antibody or antigen-binding fragment thereof displaces drug bound to CD47 on the surface of RBCs in the blood sample.
前記抗SIRPα抗体またはその抗原結合フラグメントが、 The anti-SIRPα antibody or antigen-binding fragment thereof,
(a)配列番号6を含む重鎖可変ドメイン(V (a) a heavy chain variable domain comprising SEQ ID NO:6 (V H. )と、配列番号7を含む軽鎖可変ドメイン(V) and a light chain variable domain comprising SEQ ID NO: 7 (V L. )
(b)配列番号21を含む重鎖可変ドメイン(V (b) a heavy chain variable domain comprising SEQ ID NO:21 (V H. )と、配列番号22を含む軽鎖可変ドメイン(V) and a light chain variable domain comprising SEQ ID NO: 22 (V L. )
(c)配列番号21を含む重鎖可変ドメイン(V (c) a heavy chain variable domain comprising SEQ ID NO:21 (V H. )と、配列番号22を含む軽鎖可変ドメイン(V) and a light chain variable domain comprising SEQ ID NO: 22 (V L. )
を含む、請求項1または2に記載の方法。3. The method of claim 1 or 2, comprising:
前記薬物に対する前記薬物中和剤の親和性が、ヒトCD47に対する前記薬物の親和性よりも高い、請求項1または3に記載の方法。 4. The method of claim 1 or 3 , wherein the affinity of the drug-neutralizing agent for the drug is higher than the affinity of the drug for human CD47. 前記薬物中和剤が、前記血漿試料中の前記薬物の量に対してモル過剰量で前記血漿試料に添加される、請求項1、3及び4のいずれか1項に記載の方法。 5. The method of any one of claims 1 , 3 and 4, wherein said drug-neutralizing agent is added to said plasma sample in an amount in molar excess over the amount of said drug in said plasma sample. 前記抗SIRPα抗体またはその抗原結合フラグメントが、前記血液試料中の前記薬物の量に対してモル過剰量で前記血液試料に添加される、請求項2または3に記載の方法。 4. The method of claim 2 or 3 , wherein said anti-SIRPα antibody or antigen-binding fragment thereof is added to said blood sample in a molar excess over the amount of said drug in said blood sample. 前記薬物の前記抗体Fc領域がヒトIgG Fc領域でり、任意で前記ヒトIgG Fc領域が、IgG1、IgG2、もしくはIgG4 Fc領域である、請求項1~のいずれか1項に記載の方法。 7. Any one of claims 1-6 , wherein said antibody Fc region of said drug is a human IgG Fc region , optionally said human IgG Fc region is an IgGl, IgG2, or IgG4 Fc region. Method. 前記輸血前の血清学的アッセイがABO/Rh判定アッセイ
即時スピン(IS)アッセイ
IgG及び補体C3を検出する多重特異性試薬を使用する直接抗グロブリン(DAT)アッセイ、
補体C3を検出する単一特異性試薬を使用する直接抗グロブリン(DAT)アッセイ、
PEG増強血清学的アッセイ、及び/または
前記DATアッセイの後に実施される溶出液試験
である、請求項1~のいずれか1項に記載の方法。
wherein the pre-transfusion serological assay is an ABO/Rh determination assay ;
Immediate spin (IS) assay
a direct antiglobulin (DAT) assay using multispecific reagents that detect IgG and complement C3;
a direct antiglobulin (DAT) assay using a monospecific reagent that detects complement C3;
PEG-enhanced serological assays, and/or
Eluate test performed after the DAT assay
The method according to any one of claims 1 to 7 , wherein
JP2021572418A 2019-06-07 2020-06-05 Methods and reagents for reducing interference of drugs that bind CD47 in serological assays Pending JP2022535286A (en)

Applications Claiming Priority (5)

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US201962858871P 2019-06-07 2019-06-07
US62/858,871 2019-06-07
US201962934395P 2019-11-12 2019-11-12
US62/934,395 2019-11-12
PCT/US2020/036425 WO2020247820A1 (en) 2019-06-07 2020-06-05 Methods and reagents for reducing the interference of drugs that bind cd47 in serological assays

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CN (1) CN114206912A (en)
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