JP7179855B2 - 低pH挿入ペプチド及びその組成物 - Google Patents
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- 230000002441 reversible effect Effects 0.000 description 1
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- 108010091666 romidepsin Proteins 0.000 description 1
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- 239000000377 silicon dioxide Substances 0.000 description 1
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- 150000003384 small molecules Chemical class 0.000 description 1
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- 229960003787 sorafenib Drugs 0.000 description 1
- 229960001796 sunitinib Drugs 0.000 description 1
- WINHZLLDWRZWRT-ATVHPVEESA-N sunitinib Chemical compound CCN(CC)CCNC(=O)C1=C(C)NC(\C=C/2C3=CC(F)=CC=C3NC\2=O)=C1C WINHZLLDWRZWRT-ATVHPVEESA-N 0.000 description 1
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- AYUNIORJHRXIBJ-TXHRRWQRSA-N tanespimycin Chemical compound N1C(=O)\C(C)=C\C=C/[C@H](OC)[C@@H](OC(N)=O)\C(C)=C\[C@H](C)[C@@H](O)[C@@H](OC)C[C@H](C)CC2=C(NCC=C)C(=O)C=C1C2=O AYUNIORJHRXIBJ-TXHRRWQRSA-N 0.000 description 1
- 238000002626 targeted therapy Methods 0.000 description 1
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- QFJCIRLUMZQUOT-UHFFFAOYSA-N temsirolimus Natural products C1CC(O)C(OC)CC1CC(C)C1OC(=O)C2CCCCN2C(=O)C(=O)C(O)(O2)C(C)CCC2CC(OC)C(C)=CC=CC=CC(C)CC(C)C(=O)C(OC)C(O)C(C)=CC(C)C(=O)C1 QFJCIRLUMZQUOT-UHFFFAOYSA-N 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 235000019364 tetracycline Nutrition 0.000 description 1
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- ZRKFYGHZFMAOKI-QMGMOQQFSA-N tgfbeta Chemical compound C([C@H](NC(=O)[C@H](C(C)C)NC(=O)CNC(=O)[C@H](CCC(O)=O)NC(=O)[C@H](CCCNC(N)=N)NC(=O)[C@H](CC(N)=O)NC(=O)[C@H](CC(C)C)NC(=O)[C@H]([C@@H](C)O)NC(=O)[C@H](CCC(O)=O)NC(=O)[C@H]([C@@H](C)O)NC(=O)[C@H](CC(C)C)NC(=O)CNC(=O)[C@H](C)NC(=O)[C@H](CO)NC(=O)[C@H](CCC(N)=O)NC(=O)[C@@H](NC(=O)[C@H](C)NC(=O)[C@H](C)NC(=O)[C@@H](NC(=O)[C@H](CC(C)C)NC(=O)[C@@H](N)CCSC)C(C)C)[C@@H](C)CC)C(=O)N[C@@H]([C@@H](C)O)C(=O)N[C@@H](C(C)C)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)N[C@@H](C)C(=O)N1[C@@H](CCC1)C(=O)N[C@@H]([C@@H](C)O)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](C)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](C)C(=O)N[C@@H](CC(C)C)C(=O)N1[C@@H](CCC1)C(=O)N1[C@@H](CCC1)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CO)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CC(C)C)C(O)=O)C1=CC=C(O)C=C1 ZRKFYGHZFMAOKI-QMGMOQQFSA-N 0.000 description 1
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- UJLAWZDWDVHWOW-YPMHNXCESA-N tofacitinib Chemical compound C[C@@H]1CCN(C(=O)CC#N)C[C@@H]1N(C)C1=NC=NC2=C1C=CN2 UJLAWZDWDVHWOW-YPMHNXCESA-N 0.000 description 1
- 229960004066 trametinib Drugs 0.000 description 1
- LIRYPHYGHXZJBZ-UHFFFAOYSA-N trametinib Chemical compound CC(=O)NC1=CC=CC(N2C(N(C3CC3)C(=O)C3=C(NC=4C(=CC(I)=CC=4)F)N(C)C(=O)C(C)=C32)=O)=C1 LIRYPHYGHXZJBZ-UHFFFAOYSA-N 0.000 description 1
- APEJMQOBVMLION-VOTSOKGWSA-N trans-cinnamamide Chemical compound NC(=O)\C=C\C1=CC=CC=C1 APEJMQOBVMLION-VOTSOKGWSA-N 0.000 description 1
- 238000010361 transduction Methods 0.000 description 1
- 230000026683 transduction Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000002054 transplantation Methods 0.000 description 1
- GPRLSGONYQIRFK-MNYXATJNSA-N triton Chemical compound [3H+] GPRLSGONYQIRFK-MNYXATJNSA-N 0.000 description 1
- 229930184737 tubulysin Natural products 0.000 description 1
- 230000001875 tumorinhibitory effect Effects 0.000 description 1
- 230000002100 tumorsuppressive effect Effects 0.000 description 1
- 241001430294 unidentified retrovirus Species 0.000 description 1
- 229960000241 vandetanib Drugs 0.000 description 1
- UHTHHESEBZOYNR-UHFFFAOYSA-N vandetanib Chemical compound COC1=CC(C(/N=CN2)=N/C=3C(=CC(Br)=CC=3)F)=C2C=C1OCC1CCN(C)CC1 UHTHHESEBZOYNR-UHFFFAOYSA-N 0.000 description 1
- 229960003862 vemurafenib Drugs 0.000 description 1
- GPXBXXGIAQBQNI-UHFFFAOYSA-N vemurafenib Chemical compound CCCS(=O)(=O)NC1=CC=C(F)C(C(=O)C=2C3=CC(=CN=C3NC=2)C=2C=CC(Cl)=CC=2)=C1F GPXBXXGIAQBQNI-UHFFFAOYSA-N 0.000 description 1
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- LQBVNQSMGBZMKD-UHFFFAOYSA-N venetoclax Chemical compound C=1C=C(Cl)C=CC=1C=1CC(C)(C)CCC=1CN(CC1)CCN1C(C=C1OC=2C=C3C=CNC3=NC=2)=CC=C1C(=O)NS(=O)(=O)C(C=C1[N+]([O-])=O)=CC=C1NCC1CCOCC1 LQBVNQSMGBZMKD-UHFFFAOYSA-N 0.000 description 1
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- A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
- A61K47/62—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being a protein, peptide or polyamino acid
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- A61K39/0011—Cancer antigens
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- A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
- A61K47/62—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being a protein, peptide or polyamino acid
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- A61P35/00—Antineoplastic agents
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- C—CHEMISTRY; METALLURGY
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- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/195—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria
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- C—CHEMISTRY; METALLURGY
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- C07K—PEPTIDES
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- A61K2039/585—Medicinal preparations containing antigens or antibodies raising an immune response against a target which is not the antigen used for immunisation wherein the target is cancer
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- C07K2319/00—Fusion polypeptide
- C07K2319/01—Fusion polypeptide containing a localisation/targetting motif
- C07K2319/03—Fusion polypeptide containing a localisation/targetting motif containing a transmembrane segment
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2319/00—Fusion polypeptide
- C07K2319/31—Fusion polypeptide fusions, other than Fc, for prolonged plasma life, e.g. albumin
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Description
WT: ACEQNPIYWARYADWLFTTPLLLLDLALLVDADEGT(配列番号1);
Var1: ACEDQNPYWARYADWLFTTPLLLLDLALLVDG(配列番号2);
Var2: ACEDQNPYWRAYADLFTPLTLLDLLALWDG(配列番号3);
Var3: ACDDQNPWRAYLDLLFPTDTLLLDLLW(配列番号4);
Var4: ACEEQNPWRAYLELLFPTETLLLELLW(配列番号5);
Var5: ACDDQNPWARYLDWLFPTDTLLLDL(配列番号6);
Var6: CDNNNPWRAYLDLLFPTDTLLLDW(配列番号7);
Var7: ACEEQNPWARYLEWLFPTETLLLEL(配列番号8);
Var8: CEEQQPWAQYLELLFPTETLLLEW(配列番号9);
Var9: CEEQQPWRAYLELLFPTETLLLEW(配列番号10);
Var10: ACEDQNPWARYADWLFPTTLLLLD(配列番号11);
Var11: ACEEQNPWARYAEWLFPTTLLLLE(配列番号12);
Var12: ACEDQNPWARYADLLFPTTLAW(配列番号13);
Var13: ACEEQNPWARYAELLFPTTLAW(配列番号14);
Var14: TEDADVLLALDLLLLPTTFLWDAYRAWYPNQECA(配列番号15);
Var15: CDDDDDNPNYWARYANWLFTTPLLLLNGALLVEAEET(配列番号16);
Var16: CDDDDDNPNYWARYAPWLFTTPLLLLPGALLVEAEET(配列番号17);
基本ステップ:動物免疫、細胞融合、ハイブリドーマ細胞の選別とモノクローナル抗体検出、ハイブリドーマ細胞のクローン化、モノクローナル抗体の同定及び製造等。
基本ステップ:1)末梢血又は脾臓、リンパ節等の組織からBリンパ球を分離し、mRNAを抽出してcDNAに逆転写する。2)抗体の軽鎖及び重鎖のプライマーを用いて、ライブラリ作製の必要に応じてPCR技術で異なるIg遺伝子セグメントを増幅する。3)バクテリオファージベクターを構築する。4)発現ベクターを細菌に形質転換し、完全な抗体ライブラリを構築する。抗原のアフィニティ吸着-溶出-増幅を複数回行うことにより、最終的に抗原特異的な抗体クローンを選別する。
本発明に記載の低pH挿入ペプチドは、本分野の通常の技術を用いて製造してなり、このような合成技術は、固相合成、液相合成を含む。
配列番号8及び配列番号18の配列により、カルボキシル末端からアミノ末端に向けて順に合成する。
2-クロロトリチルクロリド樹脂1gを、乾燥した清潔なペプチド合成カラムの中に置き、DCMを8ml加え、5分間膨潤させ、溶媒を真空吸引した。それぞれFmocアミノ酸を2mmol及びDIEAを5mmol取り、8mlのDCMに溶かし、樹脂中に加え、室温で軽く振り60分間反応させた。溶媒を真空吸引した。10mlのDMFで樹脂を2回洗浄し、1回は2分とした。DCM/メタノール/DIEA(80:15:5)を10ml加え、軽く振り10分間反応させ、溶媒を真空吸引した。1回繰り返した。10mlのDMFで樹脂を3回洗浄し、1回は2分とした。溶媒を真空吸引し、N2を吹き付け乾燥させた。
乾燥させたFmocアミノ酸-樹脂2mgを正確に秤取し、キュベットの中に置き、20%ピペリジン/DMFを3ml加え、軽く振り10分間反応させ、20%ピペリジン/DMFをブランク対照として用いてゼロに調整し、紫外分光光度計で試料の290nm吸光度を測定した。2回繰り返して測定し、平均値を取った。カップリング率は、以下の公式によって計算した。
カップリング率(mmol/g)=(Abs試料)/(試料重量mg×1.75)
樹脂に脱保護(DEBLOCK)試薬10mlを加え、均等に混ぜ、室温で軽く振り5分間反応させた。溶媒を捨て、10mlのDMFで樹脂を3回洗浄し、1回は2分とした。6mlのイソプロパノールで樹脂を3回洗浄し、1回は5分とした。6mlのヘキサンで樹脂を3回洗浄し、1回は5分とした。溶媒を真空吸引した。少量の樹脂試料を取り、ニンヒドリン呈色法(Kaiser法)を用いて樹脂上の遊離アミノ基含有量を素早く測定した。樹脂2mlをエタノールで3回洗浄し、5%ニンヒドリン、80%フェノールおよびKCN(2mlの0.001MのKCN:98mlのピペリジン)をそれぞれ2滴加え、均等に充分し、120℃で4~6分間加熱した。Fmoc基の脱保護反応の程度を判断した。
2つ目のアミノ酸の連結は、in-situ活性化法を採用した。Fmocアミノ酸を2mmol、TBTUを4.0mmol及びHOBTを4.0mmol取り、DMFを最少量加えて溶解した後、DIEAを5mmol加え、均等に充分混ぜ、Fmoc基を外した樹脂の中に加えた。室温で軽く振り60分間反応させた。溶媒を真空吸引した。5mlのメタノールで樹脂を3回洗浄し、1回は5分とした。10mlのDMFで樹脂を3回洗浄し、1回は2分とした。溶媒を真空吸引した。樹脂試料を少量取り、ニンヒドリン呈色分析を行った。カップリング率を測定した。
10mlのDEBLOCK試薬を用いて前のアミノ酸N末端のFmoc保護基を外し、10mlのDMFで樹脂を3回洗浄し、溶媒を真空吸引した。樹脂試料を少量取り、ニンヒドリン呈色分析を行った。(3)の方法により、次のアミノ酸をカップリングした。必要なポリペプチド鎖がカップリングされるまで、Fmoc保護基の脱保護及びアミノ酸カップリング反応を繰り返し行った。
すべてのアミノ酸配列が合成された樹脂から、アミノ酸N末端のFmoc保護基を外し、10mlのイソプロパノールで樹脂を3回洗浄し、1回は5分とした。Alexa647を1.38g、TBTU53を1.6g、DIEAを0.76ml取り、混合した後にペプチド-樹脂の中に加え、室温軽く振り60分間反応させた。溶媒を真空吸引した。5mlのメタノールで樹脂を3回洗浄し、1回は5分とした。10mlのDMFで樹脂を3回洗浄し、1回は2分とした。溶媒を真空吸引した。
すべてのアミノ酸配列が合成された樹脂を、10mlのDMFで洗浄した後、さらに6mlのイソプロパノールで樹脂を3回洗浄し、1回は5分とした。6mlのヘキサンで樹脂を3回洗浄し、1回は5分とした。溶媒を真空吸引した後、N2を吹き付け、分解容器の中に入れた。樹脂1gを25mlの切断試薬に入れ、室温で切断し、2時間反応させた。ときどき振り均等に混ぜ、反応後の混合液をガラスろ過器に通して樹脂をろ過し、切断反応混合液を収集し、TFAで樹脂を3回洗浄した。反応混合液を丸底フラスコに移し、予め冷やしておいた等体積のエチルエーテルで4回洗浄し、沈殿を収集した。乾燥後に、合成粗ポリペプチドを得た。
粗ポリペプチドに蒸留水を加え溶解した。Amersham G-25ゲルを15g秤取し、膨潤後にカラムに充填し、充填後のカラムをまず50ml蒸留水で平衡化した。平衡化後に、1回に入れる試料は3~5mlとし、蒸留水で溶出し、紫外分光光度計で220nmにおける紫外吸収を検出し、ピークでポリペプチドを収集した。
Waters社のWaters Delta Prep 4000 HPLC高速クロマトグラフを用いてポリペプチドを分離精製した。カラムは、径方向加圧カラム(25×100、15μm、DELTA PAKC18充填剤)であり、溶出システムは、A液:5%アセトニトリル溶液(0.1%TFAを含む)、B液:95%アセトニトリル溶液(0.08%TFAを含む)である。手動で試料を入れ、1回に入れる試料は1mlとし、流速4ml/分、リニアグラジエントで、45分以内に、B液を5%から50%に上昇させた後、5分以内に95%まで上昇させ、B液を最後に溶出した。215nmにおいて紫外吸収を検出し、ピークで成分を収集し、質量分析で検出した。分子量を検出して正確な成分を収集し、真空で凍結乾燥し、必要な純品とし、使用に備えた。
1、細胞株
ヒト大腸癌細胞株SW480(ADCCから購入)。
RPMI 1640培地(solarbio)、ウシ胎児血清(元亨金馬社)、PBS(pH=7.4)(Gibco)、塩酸、alexa647で標識したvar7(var7は標準var7であり、配列は、Ala-Cys-Glu-Glu-Gln-Asn-Pro-Trp-Ala-Arg-Tyr-Leu-Glu-Trp-Leu-Phe-Pro-Thr-Glu-Thr-Leu-Leu-Leu-Glu-Leu(配列番号8))及びalexa647で標識したp-var7(p-var7はvar7の細胞外ドメインを1回繰り返した伸長版var7であり、配列は、Ala-Cys-Glu-Glu-Gln-Asn-Pro-Gly-Gly-Gly-Ser-Ala-Cys-Glu-Glu-Gln-Asn-Pro-Trp-Ala-Arg-Tyr-Leu-Glu-Trp-Leu-Phe-Pro-Thr-Glu-Thr-Leu-Leu-Leu-Glu-Leu(配列番号18))。alexa647は、上記2つのポリペプチドのN末端2位のCys上に連結する。
クリーンベンチ(RONGFENG)、CO2インキュベーター(Thermo)、遠心機(Thermo)、共焦点レーザー顕微鏡用シャーレ(20mm)(Corning)、電子pH計(ザルトリウス)、光学顕微鏡(オリンパス)、共焦点レーザー顕微鏡(ニコン)。
(1)対数期にあるSW480細胞を収集し、培養液を捨て、生理食塩水で2回洗い、0.25%パンクレアチンを適量加えて細胞が容器に付着しなくなるまで消化させ、培養液を適量加えて消化を停止させ、10ml試験管に移し、1000rpmで5分間遠心し、上清を吸い取り、10%ウシ胎児血清を含むRPMI 1640培地を1ml加え、再懸濁し、細胞を均等に混ぜた。中から10μl細胞懸濁液を吸い取り、細胞計算盤の中に入れて数を計測した後、細胞懸濁液を一定量取り、共焦点レーザー顕微鏡用シャーレの中に入れ、完全培地を用いて5×105まで調整し、1ml細胞の系を、細胞培養装置に入れて1晩培養した。
結果は、図1及び図2に示す通りであった。var7及びp-var7は、酸性溶液環境において、どちらもヒト結腸癌細胞SW480表面に有効に挿入することができたが、中性溶液環境では、p-var7の膜挿入能力が失われ(図2)、var7はこの能力を持ち続けた(図2)。p-var7は、酸性の腫瘍組織微小環境での方が強い選択性を有することが示された。
1、試験手順
マウス結腸癌細胞CT26をBalb/cマウスに皮下接種し、腫瘍を約1cmの長さにし、静脈に生理食塩水(N.S.)、alexa647で標識したp-var7、alexa647で標識したvar7をそれぞれ注射し、用量は60μΜ/100μL N.S.とした。24、48、72時間後に生体イメージング(Cy5.5の波長で励起した)を行い、仰臥位で写真を撮影した。マウスを安楽死させ、腫瘍の撮像を行った。
結果は、図3の結果に示す通りであった。var7及びp-var7は、どちらも腫瘍を標識することができたが、p-var7の標識能力の方が強かった。時間の経過に伴い、var7の蛍光強度の衰えが著しく、72時間後には、腫瘍組織で少量の標識しか認められなかったのに対し、p-var7は、72時間後でも比較的強い蛍光標識が認められた。この実験によって、p-var7は、体内で腫瘍組織を標的とすることができ、且つ比較的長時間維持されることが証明された。A図において黒い矢印で表したものが、腫瘍組織である。
実験材料:MC38細胞は、ATCCから購入した。p-var7ポリペプチド(分子量4095Da)は、北京華大タンパク質研究開発センター有限公司に合成を委託し、PBSに溶かし、濃度は40μMとした。p-var7の細胞外ドメイン(Ala-Cys-Glu-Glu-Gln-Asn-Pro-Gly-Gly-Gly-Ser-Ala-Cys-Glu-Glu-Gln-Asn-Pro、配列番号22)をKLH(北京金斯瑞生物科技有限公司が合成)と連結させた。6~8週齢の雌性C57/BL6マウスは、Vital Riverから購入した。
(1)ステップ:KLHと連結したp-var7の細胞外ドメインを用いてBalb/cマウスを免疫し、ハイブリドーマを調製し、2株のモノクローナル抗体を得て、ELISAで抗体と抗原の特異的な結合及び抗体亜型を検出した。
その結果、1G12及び1G1と命名されたモノクローナル抗体が、抗原と特異的に結合することが示された。そのうち、1G12の方が、親和性が高く、1G1の方が、親和性が低かった。OD値はそれぞれ1.4423、0.4924であり、且つこの2株はどちらもIgG1亜型であり、調製された抗体の濃度は約0.7mg/mlであった。
(1)マウス結腸癌MC38移植モデルの作製:MC38をC57/BL6マウスに接種し、腫瘍の直径が1cmになったときに、腫瘍を無菌剥離し、切り刻み、ホモジネートし、ろ過して、単細胞懸濁液を作製した。1640完全培地で培養して増殖し、細胞をC57/BL6マウスの側腹部に皮下注射し、2×106個の細胞/匹とした。腫瘍の直径が0.8~1cmになるまで待ち、大きすぎる腫瘍及び小さすぎる腫瘍を除去し、腫瘍の大きさが基本的に一致したマウスを割付けた。p-var7単独注射群10匹、p-var7と1G12の併用注射群10匹、p-var7と1G1の併用注射群10匹、生理食塩水N.S注射群10匹の計4群に割付けた。3日ごとに腫瘍の大きさを測定した。
結果は、図4及び図5に示す通りであった。1G12は、腫瘍の増殖を著しく抑制することができ、2週目での抑制率は50%であったが、1G1には顕著な腫瘍抑制効果が認められなかった。治療過程において、マウスの体質の状况は良好であり、活動の低下、下痢、体重減少などの症状は認められなかった。図6は、マウスの体重が変わらなかったことを示している。病理の結果、治療群のマウスの肝臓、腎臓、肺、脾臓、腸の臓器に器質的な変化は認められなかった(図7~11)。
1、原核の発現
ステップ:
菌種の作製
配列番号21で示されるアミノ酸配列によりDNA配列を設計し全遺伝子の合成を行った。合成時に酵素切断部位Nde I及びXho I配列を両端に連結し、この2種類の酵素を用いて、それぞれher2の第IVドメイン-pHLIPを切断し、核酸及びPET28aベクターをコードした。酵素切断セグメント及びベクターを回収し、T4リガーゼを用いてコンピテントセルBL21(DE3)を連結し、平板培地で培養し、クローンを選別してシークエンシングした。
シークエンシングが正確なクローンを培養し(LB培地、37℃)、OD値が0.6~0.8になったときに誘導し、IPTGを加えて誘導し、IPTGの最終濃度を0.5mMとし、4~6時間遠心して菌を回収した。
ステップ:
(1)封入体の洗浄
A液:50mMのTris、2mMのEDTA、pH8.0、2回洗浄。
B液:50mMのTris、2mMのEDTA、0.1%のTriton、pH8.0、1回洗浄。
C液:20mMのTris、1M尿素、pH8.0、1回洗浄。
抽出:8M尿素、5mMのβ-Me、0.3MのNaCl、20mMのTrisを用いて、pH8.0で封入体を抽出し、抽出比は1:20とした。
ステップ(2)で処理した試料にSDS-PAGEを行った。結果は、図12に示す通りであった。本実験により、本発明の組成物を分離精製することができた。注:図12において、レーン1:GJ封入体リフォールディング;レーン2:試料逃げ;レーン3及び4:緩存液平衡化;レーン5:40mMのイミダゾール溶出;レーン6:300mMイミダゾール溶出;レーン7:マーカー。
1、細胞培養
A549細胞を、10%ウシ胎児血清、160万単位ゲンタマイシン/mlを含有するDMEM培地で、37℃で、5%のCO2インキュベーターの中で培養した。細胞が一面に増殖した後、1:10で継代培養した。
A549細胞(5×105/ウェル)を、カバースリップ(coverslip)シャーレで1晩培養し、培養上清を捨て、pH6.3及び7.4のPBSをそれぞれ加え、実施例5で発現したher2の第IVドメイン-pHLIP(60μg/ml)を加え、37℃で1時間培養し、上清を捨て、対応するpHのPBSで3回洗浄し、pH6.3及び7.4のPBSを加えた。トラスツズマブ-FITC又はTGLA-FITC(対照抗体)(濃度はいずれも1:400で希釈)を加え、37℃で30分間培養し、上清を捨て、対応するpHのPBSで3回洗浄し、pH7.4のPBSを加え、共焦点観察した。割付け:(1)pH6.3未処理群;(2)pH6.3組成物(her2の第IVドメイン-pHLIP);(3)pH6.3組成物(her2の第IVドメイン-pHLIP)+トラスツズマブ-FITC;(4)pH6.3組成物(her2の第IVドメイン-pHLIP)+TGLA-FITC;(5)pH7.4組成物(her2の第IVドメイン-pHLIP)+トラスツズマブ-FITC;(6)pH7.4トラスツズマブ-FITC。
図13に示すように、ヒト肺癌細胞株A549でHer2が発現しなかった。
実験材料:A549細胞は、ATCCから購入した。Her2の第IVドメイン-pHLIP(Her2 D4-pHLIP)原核発現。Herceptinは、ロシュ製薬から購入した。6~8週齢の雄性ヌードマウスは、Vital Riverから購入した。
A549をヌードマウスに接種し、腫瘍の直径が1cmになったときに、腫瘍を無菌剥離し、切り刻み、ホモジネートし、ろ過して、単細胞懸濁液を作製した。1640完全培地で培養して増殖し、細胞をヌードマウスの側腹部に皮下注射し、1×106個の細胞/匹とした。腫瘍の直径が0.5~1cmになるまで待ち、大きすぎる腫瘍及び小さすぎる腫瘍を除去し、腫瘍の大きさが基本的に一致したマウスを割付けた。Her2 D4-pHLIP単独注射群10匹、Her2 D4-pHLIPとherceptinの併用注射群10匹、Her2 D4-pHLIPとIgG1の併用注射群10匹、生理食塩水N.S注射群10匹の計4群に割付けた。3日ごとに腫瘍の大きさを測定した。
図16の結果に示すように、Herceptinは肺癌マウスの腫瘍増殖を著しく抑制した。
Claims (36)
- 配列が配列番号1である低pH挿入ペプチド又はその変異体の細胞外ドメインを2回以上繰り返して得られる配列をN末端に含有し、前記配列が配列番号1である低pH挿入ペプチドの変異体が、配列番号2~配列番号17で示す配列のポリペプチドを含むことを特徴とする改良型低pH挿入ペプチド。
- N末端からC末端までの配列が、(細胞外ドメイン)n+リンカー+前記配列が配列番号1である低pH挿入ペプチド又はその変異体であり、式中、n=1、2、3、4・・・・・・・・・・・である、請求項1に記載の改良型低pH挿入ペプチド。
- 前記リンカーの配列が(GGGS)m(式中、m=1、2、3、4・・・・・・・・・・・・)である、請求項2に記載の改良型低pH挿入ペプチド。
- 前記リンカーの配列がGGGSである、請求項3に記載の改良型低pH挿入ペプチド。
- 配列が、配列番号18に示す通りであることを特徴とする請求項1~4のいずれか一項に記載の改良型低pH挿入ペプチド。
- 請求項1~5のいずれか一項に記載の改良型低pH挿入ペプチドを含むことを特徴とする組成物。
- 請求項1~6のいずれか一項に記載の配列が配列番号1である低pH挿入ペプチド若しくはその変異体と、マーカー分子とを含む、組成物。
- 治療剤、診断剤、マーカー分子を含む機能体を含み、前記機能体は、前記改良型低pH挿入ペプチドのN末端と連結するか、若しくはC末端と連結し、又は前記配列が配列番号1である低pH挿入ペプチド若しくはその変異体のN末端と連結するか、若しくはC末端と連結することを特徴とする請求項7に記載の組成物。
- 前記治療剤が、抗体医薬品、低分子医薬品、抗生物質、ポリペプチド、ペプチド核酸、ナノ粒子、又はリポソームを含み、前記ポリペプチドが、毒素、環状ペプチド、微小管阻害薬、プロテアーゼ活性化受容体を含み、前記ペプチド核酸が、アンチセンスオリゴポリヌクレオチドペプチドを含むことを特徴とする請求項8に記載の組成物。
- 前記診断剤が、蛍光染料を含むことを特徴とする請求項8に記載の組成物。
- 前記マーカー分子が、腫瘍表面抗原又はその機能ドメインを含み、前記腫瘍表面抗原の機能ドメインは、前記腫瘍表面抗原の抗体を識別し結合するドメインであり、前記腫瘍表面抗原が、ER、PR、P53、EGFR、IGFR、Her2、CD20、CD25、CD117、CD34、CD138、CD33、VEGFR、BCMA、Mesothelin、CEA、PSCA、MUC1、EpCAM、S100、CD22、CD19、CD70、CD30、ALK、RANK、GPC2、GPC3、Her3、EGFRvIII、GD2、PD-L1、PD-L2を含むことを特徴とする請求項8に記載の組成物。
- 前記マーカー分子は、リンカーによって前記改良型低pH挿入ペプチドのN末端と連結するか、又は前記配列が配列番号1である低pH挿入ペプチド若しくはその変異体のN末端と連結する、請求項11に記載の組成物。
- 前記リンカーの配列が(GGGS)m又は(GGGGS)m(式中、m=自然数)である、請求項12に記載の組成物。
- 前記リンカーの配列がGGGGSである、請求項13に記載の組成物。
- 前記マーカー分子は、リンカーによって前記配列が配列番号1である低pH挿入ペプチドのN末端と連結する、請求項12に記載の組成物。
- 前記リンカーの配列が(GGGS)m又は(GGGGS)m(式中、m=自然数)である、請求項15に記載の組成物。
- 前記リンカーの配列がGGGGSである、請求項16に記載の組成物。
- 前記マーカー分子は、腫瘍表面抗原Her2又はその機能ドメインであることを特徴とする請求項11~17のいずれか一項に記載の組成物。
- Her2の機能ドメインは、Her2タンパクの第IVドメイン、又はHer2タンパクの第IIドメインであり、Her2タンパクの第IVドメインの配列は、配列番号20に示す通りであり、Her2タンパクの第IIドメインの配列は、配列番号23に示す通りである、請求項18に記載の組成物。
- Her2タンパクの第IVドメインは、リンカーによって前記配列が配列番号1である低pH挿入ペプチドのN末端と連結し、前記リンカーの配列はGGGGSであり、前記組成物の配列は、配列番号21で示す通りであり、Her2タンパクの第IIドメインは、リンカーによって前記配列が配列番号1である低pH挿入ペプチドのN末端と連結し、前記リンカーの配列はGGGGSであり、前記組成物の配列は、配列番号24に示す通りであることを特徴とする請求項19に記載の組成物。
- 新しい抗原配列が、請求項1~5のいずれか一項に記載の、配列が配列番号1である改良型低pH挿入ペプチドの細胞外ドメイン配列若しくはその変異体の配列を2回以上繰り返して得られる配列であり、前記新しい抗原配列が配列番号22に示す通りであることを特徴とする新しい抗原。
- 請求項21に記載の新しい抗原をコードすることを特徴とする核酸分子。
- 請求項21に記載の新しい抗原と、前記新しい抗原と連結したタンパク又はポリペプチドを含む、融合タンパク質。
- 請求項21に記載の新しい抗原と、前記新しい抗原とカップリングしたキャリアタンパク質を含む、請求項23に記載の融合タンパク質。
- 前記キャリアタンパク質が、KLH、BSA、又はOVAを含む、請求項24に記載の融合タンパク質。
- 請求項21に記載の新しい抗原又は請求項23に記載の融合タンパク質により製造されてなることを特徴とする新しい抗体。
- 請求項1~5のいずれか一項に記載の改良型低pH挿入ペプチドを含むことを特徴とする腫瘍標識システム。
- 請求項11~20のいずれかに記載の組成物を含むことを特徴とする請求項27に記載の腫瘍標識システム。
- 請求項27又は28に記載の腫瘍標識システムを含むか、又は請求項9に記載の組成物を含む、標的腫瘍治療システム。
- 請求項27又は28に記載の腫瘍標識システムと、請求項26に記載の新しい抗体、又は請求項11~20のいずれか一項に記載の組成物における腫瘍表面抗原若しくはその機能ドメインの抗体とを含む腫瘍殺傷システムを含む、請求項29に記載の標的腫瘍治療システム。
- 前記腫瘍殺傷システムがCAR-Tシステムを含む、請求項30に記載の標的腫瘍治療システム。
- 請求項7~20のいずれか一項に記載の組成物の製造における、請求項1~5のいずれか一項に記載の改良型低pH挿入ペプチドの応用。
- 請求項27又は28に記載の腫瘍標識システムの製造における、請求項1~5のいずれか一項に記載の改良型低pH挿入ペプチド、又は請求項11~20のいずれか一項に記載の組成物の応用。
- 請求項29~31のいずれか一項に記載の標的腫瘍治療システムの製造における、請求項1~5のいずれか一項に記載の改良型低pH挿入ペプチド、請求項9に記載の組成物、請求項11~20のいずれか一項に記載の組成物、又は請求項27若しくは28に記載の腫瘍標識システムの応用。
- 請求項23~25のいずれか一項に記載の融合タンパク質、請求項26に記載の新しい抗体又は請求項30~31のいずれか一項に記載の腫瘍殺傷システムの製造における、請求項21に記載の新しい抗原の応用。
- 請求項9に記載の組成物又は請求項30~31のいずれか一項に記載の腫瘍殺傷システムの製造における、請求項26に記載の新しい抗体の応用。
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