JP2019507128A - イヌ抗cd20抗体 - Google Patents
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Abstract
Description
本出願は、ASCIIフォーマットで電子的に提出された配列表を含んでおり、その全体が参照により本明細書に組み込まれる。2016年2月10日に作成された当該ASCIIコピーは、「P20914配列表」と命名され、14Kbの大きさである。
AME−133Vは、第2世代のヒト化IgG1モノクローナル抗体である。K9LO−133は、イヌにおけるCD20タンパク質へ特異的に結合するAME−133Vの部分的にイヌ化した(イヌ定常領域を伴うヒト可変領域)アイソタイプCモノクローナル抗体版である。
イヌリンパ腫組織におけるCD20発現は、AME−133V及びK9LO−133を用いた免疫組織化学的特性(IHC)を用いて評価することができる。結合を検出するために、AME−133V及びK9LO−133は、ある濃度、例えば、10μg/mLにおけるイヌリンパ腫試料の凍結切片へ適用することができる。さらに、AME−133V及びK9LO−133は、適切な種及びタイプと符合した、検出抗体の抗原性特性とは異なる抗原性特性を有する陰性対照抗体、例えば、HuIgG1と指定されたヒトIgG1(AME−133Vについて)及びDgIgGと指定されたイヌIgG(K9LO−133について)のいずれかと置換することができる。他の対照は、アッセイからの検出抗体または陰性対照抗体の省略によって生じることができる(アッセイ対照)。
非ホジキンリンパ腫の治療のためのリツキシマブのヒト用量は、375mg/m2である。概して、イヌ化学療法量は、癌のタイプにかかわらず、ヒト用量の40%である。それゆえ、理論によって拘束されることなく、イヌ非ホジキンリンパ腫のための抗CD20抗体の適切な開始用量は、約150mg/m2である。7kgのイヌの体表面積に対して調整するために、150mg/m2の数に0.37を乗じることによって修正した。イヌへ投与されたK9LO−133の結果として生じる用量は、約57mg/個体であった。
K9LO−133は、10mMのクエン酸塩、150mMのNaCl、pH6.5の中に26.3mg/mLで供給され得る。ビヒクルは、0.9%のNaClの生理塩類溶液であり得る。
Tリンパ球(CD4+及びCD8+)及びBリンパ球(CD21+及びCD22+)の量は、フローサイトメトリーによって決定することができる。フローサイトメトリーのための血液収集を給餌の前に実施した。およそ1mLのEDTA抗凝固剤処置した血液を基線(−5日後)ならびに2日後、9日後、16日後、23日後、30日後及び37日後の3匹のイヌから提供した。赤血球を塩化アンモニウム低張性緩衝液で溶解し、白血球をイヌCD4、CD8、CD21及びCD22と反応性のある抗体を用いて染色した。次に、結合していない抗体を除去し、FACScanフローサイトメータまたはFACSAriaフローサイトメータにおける10,000個の白血球の獲得を得た。
10個の凍結イヌリンパ腫試料をトリミングし、Tissue−Tek(登録商標)OCT(至適切断温度)コンパウンド中に包埋し、−80℃を維持するよう設定した冷凍庫の中で切片作製時まで保存した。切片をおよそ5μmで切断して、その後のIHC染色のために適切な数のスライドを作製した。
各リンパ腫試料由来の切片を、以下に詳述されるようにIHCを用いて、ヒトCD20へ直接移動するヒトIgG1モノクローナル抗体AME−133V、及びイヌCD20へ直接移動するキメライヌアイソタイプCモノクローナル抗体K9LO−133を用いて染色した。AME−133Vは、リン酸緩衝塩類溶液(PBS)(pH7.4)中の19.5mg/mL溶液にあった。K9LO−133は、PBS(pH7.4)中の2.5mg/mL溶液にあった。
間接的なイムノペルオキシダーゼ手順を用いて、イヌリンパ腫組織をAME−133Vで染色して、CD20を検出した。スライドをアセトン中に室温で10分間、切片作製時に固定した。アセトン固定した凍結切片をリン酸緩衝塩類溶液、0.15MのNaCl、pH7.2PBS中で2回すすいだ。次に、Biocare PeroxAbolishとともにスライドを室温で5分間インキュベーションによって内在性ペルオキシダーゼを自己消光させた。次に、このスライドをPBSで2回すすぎ、アビジン溶液とともに15分間インキュベートし、PBSで1回すすぎ、ビオチン溶液とともに15分間インキュベートし、PBSで1回すすいだ。次に、このスライドを、非特異的結合を減少させるよう設計されたタンパク質ブロックを用いて20分間処理した。タンパク質ブロックを次の通り調製した。PBS+1%ウシ血清アルブミン(BSA)、0.5%カゼイン、及び3%ロバ血清。
間接的イムノペルオキシダーゼ手順を使用して、イヌリンパ腫組織をK9LO−133で染色して、CD20を検出することができる。K9LO−133の標識付け(例えば、ビオチン、ペルオキシダーゼ、またはフルオレセイン)の必要条件及び二次標識した抗イヌIgGと検討した組織に内在するIgGの間の非特異的反応性の防止は、以下のプロセスにより除去することができる。標識した二次抗体は、組織凍結切片への適用の前に、一次/二次抗体混合物のインキュベーションによって、非標識一次抗体(K9LO−133、DgIgG、または何もなし)へ特異的に付着させておいた。検出試薬または陰性対照抗体(10μg/mLの濃度の)を、15μg/mLの濃度のビオチン化ウサギ抗イヌIgG、Fcフラグメント特異的抗体(RbαDgIgG)と混合して、染色前日に一次抗体と二次抗体の比が1:1.5に到達した。
配列表
配列番号1;PRT;人工配列
EVQLVQSGAEVKKPGESLKISCKGSGRTFTSYNMHWVRQMPGKGLEWMGAIYPLTGDTSYNQKSKLQVTISADKSISTAYLQWSSLKASDTAMYYCARSTYVGGDWQFDVWGKGTTVTVSSASTTAPSVFPLAPSCGSQSGSTVALACLVSGYIPEPVTVSWNSGSLTSGVHTFPSVLQSSGLYSLSSMVTVPSSRWPSETFTCNVAHPATNTKVDKPVPKRENGRVPRPPDCPKCPAPELLGGPSVFIFPPKPKDTLLIARTPEVTCVVVDLDPENPEVQISWFVDSKQVQTANTQPREEQSNGTYRVVSVLPIGHQDWLSGKQFKCKVNNKALPSPIEEIISKTPGQAHQPNVYVLPPSRDEMSKNTVTLTCLVKDFFPPEIDVEWQSNGQQEPESKYRMTPPQLDEDGSYFLYSKLSVDKSRWQRGDTFICAVMHEALHNHYTQISLSHSPGK
配列番号2;DNA;人工配列
GAGGTGCAGCTGGTGCAGTCTGGAGCAGAGGTGAAAAAGCCCGGGGAGTCTCTGAAGATCTCCTGTAAGGGTTCTGGCCGTACATTTACCAGTTACAATATGCACTGGGTGCGCCAGATGCCCGGGAAAGGCCTGGAGTGGATGGGGGCTATTTATCCCTTGACGGGTGATACTTCCTACAATCAGAAGTCGAAACTCCAGGTCACCATCTCAGCCGACAAGTCCATCAGCACCGCCTACCTGCAGTGGAGCAGCCTGAAGGCCTCGGACACCGCCATGTATTACTGTGCGAGATCGACTTACGTGGGCGGTGACTGGCAGTTCGATGTCTGGGGCAAGGGGACCACGGTCACCGTCTCCTCAGCCTCCACCACGGCCCCCTCGGTTTTCCCGCTAGCGCCCAGCTGTGGGTCCCAATCCGGCTCCACGGTGGCCCTGGCCTGCCTGGTGTCAGGCTACATCCCCGAGCCTGTAACTGTGTCCTGGAATTCCGGCTCCTTGACCAGCGGTGTGCACACCTTCCCGTCCGTCCTGCAGTCCTCAGGGCTCTACTCCCTCAGCAGCATGGTGACAGTGCCCTCCAGCAGGTGGCCCAGCGAGACCTTCACCTGCAATGTGGCCCACCCGGCCACCAACACTAAAGTAGACAAGCCAGTGCCCAAAAGAGAAAATGGAAGAGTTCCTCGCCCACCTGATTGTCCCAAATGCCCAGCCCCTGAACTGCTGGGAGGGCCTTCGGTCTTCATCTTTCCCCCAAAACCCAAGGACACCCTCTTGATTGCCCGAACACCTGAGGTCACATGTGTGGTGGTGGATCTGGACCCAGAAAACCCTGAGGTGCAGATCAGCTGGTTCGTGGATAGTAAGCAGGTGCAAACAGCCAACACGCAGCCTCGTGAGGAGCAGTCCAATGGCACCTACCGTGTGGTCAGTGTCCTCCCCATTGGGCACCAGGACTGGCTTTCAGGGAAGCAGTTCAAGTGCAAAGTCAACAACAAAGCCCTCCCATCCCCCATTGAGGAGATCATCTCCAAGACCCCAGGGCAGGCCCATCAGCCTAATGTGTATGTCCTGCCGCCATCGCGGGATGAGATGAGCAAGAATACGGTCACCCTGACCTGTCTGGTCAAAGACTTCTTCCCACCTGAGATTGATGTGGAGTGGCAGAGCAATGGACAGCAGGAGCCTGAGAGCAAGTACCGCATGACCCCGCCCCAGCTGGATGAAGATGGGTCCTACTTCCTATACAGCAAGCTCTCCGTGGACAAGAGCCGCTGGCAGCGGGGAGACACCTTCATATGTGCGGTGATGCATGAAGCTCTACACAACCACTACACACAGATATCCCTCTCCCATTCTCCGGGTAAATGATGATAG
配列番号3;PRT;人工配列
EVQLVQSGAEVKKPGESLKISCKGSGRTFTSYNMHWVRQMPGKGLEWMGAIYPLTGDTSYNQKSKLQVTISADKSISTAYLQWSSLKASDTAMYYCARSTYVGGDWQFDVWGKGTTVTVSS
配列番号4;PRT;人工配列
EVQLVQSGAEVKKPGESLKISC
配列番号5;PRT;人工配列
KGSGRTFTSYNMH
配列番号6;PRT;人工配列
WVRQMPGKGLEWMG
配列番号7;PRT;人工配列
AIYPLTGDTSYNQKSKL
配列番号8;PRT;人工配列
QVTISADKSISTAYLQWSSLKASDTAMYYC
配列番号9;PRT;人工配列
ARSTYVGGDWQFDV
配列番号10;PRT;人工配列
EIVLTQSPGTLSLSPGERATLSCRASRSVPYIHWYQQKPGQAPRLLIYATSALASGIPDRFSGSGSGTDFTLTISRLEPEDFAVYYCQQWLSNPPTFGQGTKLEIKRNDAQPAVYLFQPSPDQLHTGSASVVCLLNSFYPKDINVKWKVDGVIQDTGIQESVTEQDKDSTYSLSSTLTMSSTEYLSHELYSCEITHKSLPSTLIKSFQRSECQRVD
配列番号11;DNA;人工配列
GAAATTGTGTTGACGCAGTCTCCAGGCACCCTGTCTTTGTCTCCAGGGGAAAGAGCCACCCTCTCCTGCAGGGCCAGCCGGAGTGTACCGTACATCCACTGGTACCAGCAGAAACCTGGCCAGGCTCCCAGGCTCCTCATCTATGCCACATCCGCTCTGGCTTCTGGCATCCCAGACAGGTTCAGTGGCAGTGGGTCTGGGACAGACTTCACTCTCACCATCAGCAGACTGGAGCCTGAAGATTTTGCAGTGTATTACTGTCAGCAGTGGCTGAGTAACCCACCCACTTTTGGCCAGGGGACCAAGCTGGAGATCAAACGAAATGATGCCCAGCCAGCCGTCTATTTGTTCCAACCATCTCCAGACCAGTTACACACAGGAAGTGCCTCTGTTGTGTGCTTGCTGAATAGCTTCTACCCCAAAGACATCAATGTCAAGTGGAAAGTGGATGGTGTCATCCAAGACACAGGCATCCAGGAAAGTGTCACAGAGCAGGACAAGGACAGTACCTACAGCCTCAGCAGCACCCTGACGATGTCCAGTACTGAGTACCTAAGTCATGAGTTGTACTCCTGTGAGATCACTCACAAGAGCCTGCCCTCCACCCTCATCAAGAGCTTCCAAAGGAGCGAGTGTCAGAGAGTGGAC
配列番号12;PRT;人工配列
EIVLTQSPGTLSLSPGERATLSCRASRSVPYIHWYQQKPGQAPRLLIYATSALASGIPDRFSGSGSGTDFTLTISRLEPEDFAVYYCQQWLSNPPTFGQGTKLEIK
配列番号13;PRT;人工配列
EIVLTQSPGTLSLSPGERATLSC
配列番号14;PRT;人工配列
RASRSVPYIH
配列番号15;PRT;人工配列
WYQQKPGQAPRLLI
配列番号16;PRT;人工配列
YATSALAS
配列番号17;PRT;人工配列
GIPDRFSGSGSGTDFTLTISRLEPEDFAVYYC
配列番号18;PRT;人工配列
QQWLSNPPT
配列番号19;PRT;人工配列
FGQGTKLEIK
Claims (15)
- アミノ酸配列が配列番号12に定められる軽鎖可変領域(LCVR)と、アミノ酸配列が配列番号3に定められる重鎖可変領域(HCVR)と、を含む、抗体。
- 前記抗体がイヌCD20へ特異的に結合する、請求項1に記載の抗体。
- アミノ酸配列が配列番号10に定められる軽鎖(LC)と、アミノ酸配列が配列番号1に定められる重鎖(HC)と、を含む、抗体。
- 前記抗体がイヌCD20へ特異的に結合する、請求項3に記載の抗体。
- 配列番号10に定められるアミノ酸配列を各々有する2つの軽鎖(LC)と、配列番号1に定められるアミノ酸配列を各々有する2つの重鎖(HC)と、を含む、抗体。
- 前記抗体がイヌCD20へ特異的に結合する、請求項5に記載の抗体。
- イヌ患者におけるリンパ腫を治療する方法であって、このような治療を必要とするリンパ腫癌イヌ患者へ、アミノ酸配列が配列番号12に定められる軽鎖可変領域(LCVR)と、アミノ酸配列が配列番号3に定められる重鎖可変領域(HCVR)と、を含む有効量の抗体を投与することを含み、前記抗体がイヌCD20へ特異的に結合する、方法。
- 前記抗体が、アミノ酸配列が配列番号10に定められる軽鎖(LC)と、アミノ酸配列が配列番号1に定められる重鎖(HC)と、を含む、請求項7に記載の方法。
- 前記抗体がK9LO−133である、請求項7に記載の方法。
- K9LO−133を、1つまたは複数の薬学的に許容される担体、希釈剤、または賦形剤とともに含む、薬学的組成物を含む、キット。
- アミノ酸配列が配列番号10に定められる軽鎖(LC)と、アミノ酸配列が配列番号1に定められる重鎖(HC)と、を含む抗体であって、イヌCD20へ特異的に結合し、かつプロテインAへ結合する、抗体。
- アミノ酸配列が配列番号12に定められる軽鎖可変領域(LCVR)と、アミノ酸配列が配列番号3に定められる重鎖可変領域(HCVR)と、を含む抗体の、イヌ患者におけるリンパ腫を治療するための使用であって、前記抗体がイヌCD20へ特異的に結合する、使用。
- 前記抗体が、アミノ酸配列が配列番号10に定められる軽鎖(LC)と、アミノ酸配列が配列番号1に定められる重鎖(HC)と、を含む、請求項12に記載の使用。
- 前記抗体がK9LO−133である、請求項12に記載の使用。
- イヌ患者におけるリンパ腫を治療する上での使用のための、アミノ酸配列が配列番号12に定められる軽鎖可変領域(LCVR)と、アミノ酸配列が配列番号3に定められる重鎖可変領域(HCVR)と、を含む抗体であって、イヌCD20へ特異的に結合する、抗体。
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WO2017142800A1 (en) * | 2016-02-18 | 2017-08-24 | Eli Lilly And Company | Chimeric canine anti-cd20 antibody |
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EP4355782A1 (en) * | 2021-06-17 | 2024-04-24 | Petmedix Ltd. | Anti canine cd20 antibodies |
WO2023010057A1 (en) * | 2021-07-28 | 2023-02-02 | Atreca, Inc. | Atrc-101 target expression assay |
GB202217993D0 (en) * | 2022-11-30 | 2023-01-11 | Petmedix Ltd | Therapeutic antibodies |
WO2024145278A2 (en) | 2022-12-27 | 2024-07-04 | Invetx, Inc. | Polypeptides with altered binding to neonatal fc receptor (fcrn) and methods of use |
WO2024155982A2 (en) | 2023-01-20 | 2024-07-25 | Invetx, Inc. | Bispecific binding agents for use in companion animals |
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US20190194342A1 (en) | 2019-06-27 |
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BR112018016367A2 (pt) | 2019-01-22 |
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