JP7104949B2 - Carをコードするヌクレオチド配列、このcarを発現するrobo1 car-nk細胞、その調製及び使用 - Google Patents
Carをコードするヌクレオチド配列、このcarを発現するrobo1 car-nk細胞、その調製及び使用 Download PDFInfo
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Description
前記共刺激シグナル伝達領域は、共刺激分子の細胞内ドメインを含み、前記共刺激分子は、CD3ζ、CD3γ、CD3δ、CD3ε、CD5、CD22、CD79a、CD79b、CD66d、CD2、CD4、CD5、CD28、CD134、CD137、ICOS、CD154、4-1BB及びOX40からなる群より選択され、好ましくは、前記共刺激シグナル伝達領域は、4-1BB及びCD3ζ細胞内ドメインを含む。
ステップ(1)において、前記ヌクレオチド配列を合成して増幅し、前記ヌクレオチド配列をレンチウイルス発現ベクターにクローニングする。好ましくは、前記ヌクレオチド配列は、SCFV-CD8-4-1BB-CD3ζ融合タンパク質遺伝子である。
ステップ(2)において、レンチウイルスパッケージングプラスミド及びステップ(1)で得られたレンチウイルス発現ベクタープラスミドを293T細胞に感染させ、レンチウイルスをパッケージングして調製する。
ステップ(3)において、ステップ(2)で得られたレンチウイルスをNK-92細胞に感染させ、CAR-NK細胞を得る。
本明細書に記載の「ストリンジェントな条件」は、低ストリンジェントな条件、中ストリンジェントな条件、及び高ストリンジェントな条件の1つであってもよく、好ましくは高ストリンジェントな条件である。例示的には、「低ストリンジェントな条件」は、30℃、5×SSC、5×Denhardt液、0.5%SDS、52%ホルムアミドの条件であり、「中ストリンジェントな条件」は、40℃、5×SSC、5×Denhardt液、0.5%SDS、52%ホルムアミドの条件であり、「高ストリンジェントな条件」は、50℃、5×SSC、5×Denhardt液、0.5%SDS、52%ホルムアミドの条件である。当業者は、温度が高いほど、相同性がより高いポリヌクレオチドが得られることを理解できる。さらに、当業者は、対応するストリンジェンシーを達成するためにハイブリダイゼーションのストリンジェンシーに影響を与える温度、プローブ濃度、プローブ長さ、イオン強度、時間、及び塩濃度などの複数の要因によって形成される包括的な結果を選択できる。
SCFV(Anti ROBO1-FN3)-CD8-4-1BB-CD3ζ融合遺伝子配列(そのアミノ酸配列は配列番号:1に示され、遺伝子配列は配列番号:2に示される)及び変異型SCFV(Anti ROBO1-FN3)-CD8-4-1BB-CD3ζ融合遺伝子配列(そのアミノ酸配列は配列番号:3に示され、遺伝子配列は配列番号:4に示される)をそれぞれ合成した。SCFV(Anti ROBO1-FN3)-CD8-4-1BB-CD3ζ融合遺伝子を例としてROBO1 CAR-NK細胞の調製過程を説明する。変異型SCFV(Anti ROBO1-FN3)-CD8-4-1BB-CD3ζ融合遺伝子を用いてROBO1M CAR-NK細胞を調製する過程は同じである。
(1)トランスフェクションの時に293T細胞が約80%コンフルエントになりかつ培養皿に均一に分布することを確保するために、トランスフェクションの24時間前に約8×106/皿で293T細胞を15cm培養皿に接種した。
(2)溶液A及び溶液Bの準備
溶液A:6.25ml 2×HEPES buffer緩衝液(5つの大きな皿を一緒にパッケージングする量であり、効果が最も高い)。
NK-92細胞の密度を2-3×105/mlに調整し、体積比(V/V)によるウイルス:細胞培地=1:5で、実施例2で調製したウイルスを加え、さらにポリブレン8μg/mlを加えた。4時間後に、等量の新鮮な完全培地を追加して細胞密度を1×105/mlに調整した後、引き続き培養した。翌日、全ての細胞を遠心分離し、新鮮な培地を加え、引き続き培養した。細胞密度が2-3×105/mlに維持されるように1-2日ごとに培地を補給した。72時間後にCAR抗体染色を行い、フローサイトメトリーによりROBO1 CAR NK-92陽性細胞を選別して拡大培養した。培地の色の変化、細胞密度、細胞形態を毎日観察し、記録した。
(1)T細胞の調製:健常者から血液100MLを採取し、(15/50ml BDチューブ)Ficall試薬による密度勾配遠心でPBMCを分離し、T細胞培地(X-VIVO 15、血清(5%)/血漿、IL-2 300IU(輸入)/ml、500IU(国内)/ml、二重抗体10%)を用いて分離したPBMCを活性化培養し、活性化培養したPBMCを得た。その後、活性化培養したPBMCを再懸濁し、CD3+のT細胞(一般にはPBMCの50%-60%を占める)を分離した。磁気ビーズを用いてCD3+のT細胞(磁気ビーズ:T=3:1)を収集し(残りの細胞は他の実験に使用できる)、T細胞を得た。
CCK-8方法(Human Leukocyte Antigen-G Inhibits the Anti-Tumor Effect of Natural Killer Cells via Immunoglobulin-Like Transcript 2 in Gastric Cancer, Rui Wan Zi-Wei Wang Hui Li ,et al.を参照)によりROBO1 CAR-NK細胞、ROBO1M CAR-NK細胞の異なる腫瘍細胞系に対する殺傷効果を評価した。腫瘍細胞系は、肺がん細胞系H1299、肺がん細胞系A549、膵臓がん細胞系ASPC-1及び肝がん細胞系HepG2を含む。実験の操作方法は以下の通りである。
(1)24ウェルプレート中で1ml腫瘍細胞懸濁液(2X104個/ウェル)を調製した。培養プレートをインキュベーターで12時間前培養した。
(2)24ウェルプレートの培養上清を捨て、各ウェルに1mlエフェクター細胞を加え、エフェクター細胞数と標的細胞数の比は1:1であった。培地対照ウェルに1ml培地のみを加え、各実験を3回繰り返した。エフェクター細胞と標的細胞を合計4時間インキュベートした。
(3)各ウェルに100ul CCK-8溶液を加え、培養プレートをインキュベーター内で2時間インキュベートした。
(4)マイクロプレートリーダーにより450nmでの吸光度を測定した。
(5)殺傷率=(As-Ab)/(Ac-Ab)X100%
As:試験ウェル(腫瘍細胞含有培地、CCK-8、CAR-NK)
Ac:対照ウェル(腫瘍細胞含有培地、CCK-8)
Ab:ブランク対照(細胞及びCAR-NKを含有しない培地、CCK-8)
ROBO1 CAR-NK細胞、ROBO1M CAR-NK細胞の体外腫瘍に対する殺傷効果評価の実験結果を図5a-5dに示す。
CCK-8方法によりROBO1M CAR-NK細胞の神経膠腫細胞系U87-MG及び神経膠腫細胞SH-SY5Yに対する殺傷効果を評価した。NK 92細胞を対照とした。その実験結果を図5f及び図5eに示す。
CCK-8方法によりROBO1M CAR-NK細胞の乳腺細胞系MCF-7、HCC1143、HCC1187、HCC1599、HCC1806及びHCC38に対する殺傷効果を評価した。NK 92細胞を対照とした。その実験結果を図6a-6fに示す。
一、患者状況
王某、女性、55歳。2016年6月、シャワーを浴びていた時に偶然に右乳房に索状腫物があることに気付き、腫物は押しても動かず、乳首が黄色みを帯び、臭い液が分泌され、右側の腋窩に多発性リンパ節症があり、痛みがなく、吐き気も嘔吐もなく、目眩、頭痛、その他の不快感もないため、患者は注意を払わなかった。
治療設計前に、病理組織化学により患者のROBO1標的の発現を測定した。発現結果を図10に示す。結果は陽性であり、Robo1M CAR-NK細胞で治療することができる。患者に重度の局所病巣及び骨転移病巣があることに鑑み、まず、腫瘍組織内に直接注射し、さらに全身治療を行う治療計画を設計した。患者にRobo1M CAR-NK細胞を隔日投与で週に2回直接注射した。初期注射細胞数は1×109細胞/回であり、有害反応が発生しない場合、2×109細胞/回に増加する。輸液に関連する有害反応を減らすために、細胞注射前に患者にデキサメタゾンと塩酸プロメタジンを投与し、耐性が良好であれば、デキサメタゾンの用量を低減するか又はデキサメタゾンを使用しない。患者が局所注射後に反応がした場合、患者に全身治療を与える。
2017年5月25日から2017年6月29日にかけて、この患者に合計8回(2回は1×109細胞、6回は2×109細胞)のRobo1M CAR-NK細胞腫瘍部位の直接注射を与えた。6月17日から6月29日まで、患者に細胞を静脈内注入した(2×109細胞/回、3回/週、隔日投与、合計5回)。治療過程を図9に示す。図9は、Robo1M CAR-NK細胞治療過程の模式図である。同図には、実線の矢印は腫瘍組織内への直接注射、破線の矢印は静脈内注入を示す。
5月25日及び6月6日に右乳房にRobo1M CAR-NK細胞を2回局所注射したところ、右乳房の腫物は6*5cmの大きさまで明らかに小さくなり、乳房局所潰瘍も大幅に改善し、治療は有効であった。
CFSE染色法(A Mathematical Model of Natural Killer Cell Activity, Anna Scherbakova,1,2 Helen Lust,1,2 Hele Everaus,1,2,3 Alar Aints1,2,4*を参照)によりROBO1 CAR-T細胞、ROBO1M CAR-NK細胞の異なる腫瘍細胞系に対する殺傷効果を調べ、T細胞を対照とした。腫瘍細胞系は、乳がん細胞系HCC1937、MCF7、MDA-MB-453及び膵臓がん細胞系BXPC3を含む。実験の操作方法は以下の通りである。
(1)事前に標的細胞を処理し、1μlのCFSEに1X106個の細胞があるように標的細胞をCFSEに加え、暗所でインキュベーターで15分間インキュベートし、10%のBSAで停止させ、PBSで2回洗浄し、24ウェルプレートに調製した500μl腫瘍細胞懸濁液(8X104個/ウェル)を加えた。培養プレートをインキュベーターで12時間前培養した。
(2)エフェクター細胞対標的細胞が0.5:1及び1:1の割合で500μlのエフェクター細胞を加え、各実験を3回繰り返し、エフェクター細胞と標的細胞を合計4時間インキュベートした。
(3)4時間後、上清を1.5のEPチューブにピペットで移し、各ウェルに200μlのパンクレアチンを加えて1分間消化した後、移した上清で細胞をピペッティングし、遠心分離した後PBSで再懸濁し、1ulの7-AADを加え、暗所で15分間インキュベートした後、機器で調べた。
(4)殺傷率=(標的細胞の殺傷率-自発死亡率)/(1-自発死亡率)X100%
ROBO1 CAR-T細胞、ROBO1M CAR-NK細胞の体外腫瘍殺傷効果についての評価実験の結果を図11-14に示す。
Claims (9)
- キメラ抗原受容体をコードするヌクレオチドであって、
前記キメラ抗原受容体は、抗原結合ドメインと、膜貫通ドメインと、共刺激シグナル伝達領域を含み、前記抗原結合ドメインは、腫瘍特異抗原ROBO1に特異的に結合可能であり、膜貫通ドメイン及び共刺激シグナル伝達領域によりNK細胞を活性化し、
前記抗原結合ドメインは、ROBO1のFN3ドメインに特異的に結合する抗体又はその抗原結合断片であり、前記抗原結合断片は、変異型scFvであり、
前記膜貫通ドメインは、CD8であり、前記共刺激シグナル伝達領域は、4-1BB及びCD3ζ細胞内ドメインを含み、
前記キメラ抗原受容体は、構造がscFv-CD8-4-1BB-CD3ζである融合タンパク質であり、前記scFv-CD8-4-1BB-CD3ζ融合タンパク質のアミノ酸配列は、配列番号:3に示されることを特徴とする、キメラ抗原受容体をコードするヌクレオチド。 - 前記scFv-CD8-4-1BB-CD3ζ融合タンパク質をコードするヌクレオチドは、配列番号:4に示されることを特徴とする、請求項1に記載のキメラ抗原受容体をコードするヌクレオチド。
- キメラ抗原受容体を発現するROBO1 CAR-NK細胞であって、
前記キメラ抗原受容体は、抗原結合ドメインと、膜貫通ドメインと、共刺激シグナル伝達領域を含み、
前記抗原結合ドメインは、腫瘍特異抗原ROBO1に特異的に結合可能であり、膜貫通ドメイン及び共刺激シグナル伝達領域によりNK細胞を活性化し、
前記抗原結合ドメインは、ROBO1のFN3ドメインに特異的に結合する抗体又はその抗原結合断片であり、前記抗原結合断片は、変異型scFvであり、
前記膜貫通ドメインは、CD8であり、前記共刺激シグナル伝達領域は、4-1BB及びCD3ζ細胞内ドメインを含み、
前記キメラ抗原受容体は、構造がscFv-CD8-4-1BB-CD3ζである融合タンパク質であり、前記scFv-CD8-4-1BB-CD3ζ融合タンパク質のアミノ酸配列は、配列番号:3に示されることを特徴とする、ROBO1 CAR-NK細胞。 - 前記scFv-CD8-4-1BB-CD3ζ融合タンパク質をコードするヌクレオチドは、配列番号:4に示されることを特徴とする、請求項3に記載のROBO1 CAR-NK細胞。
- 有効治療量の請求項3又は4に記載のROBO1 CAR-NK細胞を含むことを特徴とする、腫瘍を治療するための医薬組成物。
- 前記医薬組成物は、薬学的に許容される添加剤をさらに含み、前記医薬組成物の剤形は水剤であることを特徴とする、請求項5に記載の医薬組成物。
- 前記腫瘍は、肝がん、乳がん、結腸がん、膵臓がん、前立腺がん、神経膠腫又は肺がんであることを特徴とする、請求項5又は6に記載の医薬組成物。
- がんを治療及び/又は予防する医薬品の調製における請求項3又は4に記載のROBO1 CAR-NK細胞の使用。
- 前記がんは、肝がん、乳がん、結腸がん、膵臓がん、前立腺がん、神経膠腫又は肺がんであることを特徴とする、請求項8に記載の使用。
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