JP2019507117A - P65の転写調節ドメインと蛋白質運搬ドメインとを含む新規融合蛋白質およびその用途 - Google Patents
P65の転写調節ドメインと蛋白質運搬ドメインとを含む新規融合蛋白質およびその用途 Download PDFInfo
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Abstract
Description
(a)本発明は、NF−κBのサブユニットであるp65の転写調節ドメインと蛋白質運搬ドメインとを含む融合蛋白質およびその用途を提供する。
(b)本発明の融合蛋白質は、競合阻害によってNF−κBおよびIL−2の転写を抑制し、LPSによる炎症性サイトカインの分泌を抑制し、脾臓細胞におけるIL−2、IFN−γ、IL−4、IL−17AおよびIL−10の生成を抑制する効果があることから、NF−κBの過活性−関連疾患の予防または治療組成物として有用に利用可能である。
蛋白質運搬ドメイン(PTD)のHph−1(配列リスト第4配列)を、p65の転写調節ドメインのp65−TMD(配列リスト第2配列)とpET−28a(+)ベクター(Novagen)にクローニングして、組換え融合DNA(nt−p65−TMD)(配列リスト第6配列)を製作した。前記組換え融合DNAをBL21CodonPlus(DE3)−RIPL大腸菌菌株(Invitogen)に形質転換させた。前記形質転換菌株を培養した後、1mM IPTG(isopropyl−β−D−thiogalactopyranoside、Duchefa)を入れて、37℃で5時間蛋白質を発現するように誘導した。その後、細胞のみを集めて分解用緩衝液(10mM イミダゾール、50mM NaH2PO4、300mM NaClおよびpH8.0)に溶解させた後、粉砕機で細胞を分解させた。融合蛋白質は、蛋白質の前部分に人為的に結合させておいた6個のヒスチジン(Histidine)を用いてNi−NTAビーズ(Qiagen)と結合させた。カラム(HisTrap chromatography columns、Bio−Rad)に蛋白質を入れて洗浄用緩衝液(30mM イミダゾール、50mM NaH2PO4、300mM NaClおよびpH8.0)で十分に洗浄し、溶出用緩衝液(250mM イミダゾール、50mM NaH2PO4、300mM NaClおよびpH8.0)で蛋白質を分離した。PD−10Sephadex G−25(GE Healthcare)を用いて緩衝液を10%グリセロールPBSに切り替えながらイミダゾールとNaClを除去した。得られた蛋白質にはLPSのようなエンドトキシンが存在するので、これを除去するために、SPビーズ(SP SepharoseTM Fast Flow、GE Healthcare)によりもう一度精製をした。これを再び結合用緩衝液(50mM NaH2PO4、300mM NaCl、pH6.0)で結合させた後、これをカラムに入れて溶出用緩衝液(50mM NaH2PO4、2M NaCl、pH6.0)で蛋白質を分離した。最後に、PD−10Sephadex G−25によりNaClを除去し、緩衝液を10%グリセロールPBSに切り替えた後、最終的に得られた蛋白質(配列リスト第5配列、組換え融合蛋白質)は実験前まで80℃で保管した(図1および2参照)。
(2−1.ウェスタンブロットを利用した細胞内伝達の確認)
BV2ミクログリア細胞とジャーカット(Jurkat)T細胞を用いて、実施例1のnt−p65−TMDを濃度別(0、0.1、0.5、1、2および5μM)または時間別(0、1、2、4、6、12、24および48h)に組換え融合蛋白質と共に培養し、ウェスタンブロットで蛋白質伝達の有無を確認した。
その結果、濃度に比例してよく伝達されることを確認し、48時間後にも細胞培養液内で蛋白質が構造をよく維持しつつ持続的に伝達されることを確認した(図3参照)。
実施例1のnt−p65−TMD組換え融合蛋白質5μMを、1時間、BV2ミクログリア細胞およびHeLa細胞と共に培養をし、PBSで洗った後、0.2%Triton X−100(Sigma−Aldrich)を用いて細胞に隙間を設けた後、その間に蛍光標識抗体を前記組換え融合蛋白質に結合させた。次に、DAPI染色剤(Invitrogen)を用いて細胞の核を染色した後、蛍光顕微鏡により蛍光の位置を確認して、組換え融合蛋白質が伝達された位置を確認した。
大腸菌菌株から発現して得た蛋白質からLPSが完全に除去されて細胞や動物で毒性を示さないことを確認するために、細胞毒性テストを行った。BV2ミクログリア細胞および脾臓細胞に多様な濃度の蛋白質を伝達した後に、生きている細胞に存在するジヒドロゲナーゼによって色を示す基質のWST−8を入れて共に培養した。
(4−1.HEK293T細胞におけるNF−κBおよびIL−2の転写抑制効果の確認)
実施例1のnt−p65−TMD組換え融合蛋白質がNF−κBおよびIL−2サイトカイン遺伝子のプロモーターに野生型p65の代わりに結合して発現を抑制するかを直接的に確認するために、ルシフェラーゼレポーター遺伝子(luciferase reporter gene)を用いた。まず、HEK293T細胞に、下位にルシフェラーゼを有するNF−κBおよびIL−2プロモーターと野生型p65遺伝子を核内注入(transfection)した後、nt−p65−TMD組換え融合蛋白質で処理した。
BV2ミクログリア細胞に、実施例1のnt−p65−TMD組換え融合蛋白質を処理した後、1時間後にLPS(1μg/ml、E.coli serotype O55:B5、Sigma−Aldrich)を処理して24時間培養した。
実施例1のnt−p65−TMD組換え融合蛋白質が抗CD3(1μg/ml、BD Pharmingen)および抗CD28(1μg/ml、BD Pharmingen)で刺激されたジャーカットT細胞の活性化によって活性化されたNF−κBの転写を特異的に抑制するか否かを確認した。T細胞が活性化されると、NF−κBのみならず、NFATの転写も活性化されるため、nt−p65−TMD融合蛋白質がNFATの転写には影響を及ぼさずにNF−κBだけを抑制する場合、nt−p65−TMD組換え融合蛋白質がNF−κBに特異的な競合阻害剤として作用することを確認することができる。したがって、これを確認するために、ルシフェラーゼレポーター遺伝子を用いた。まず、ジャーカットT細胞に、下位にルシフェラーゼを有するNF−κBおよびNFATレポーター遺伝子を、電気穿孔法(elctroporation)を利用して核内注入した後、抗CD3および抗CD28で刺激されたジャーカットT細胞をnt−p65−TMD組換え融合蛋白質で処理した。
実施例1のnt−p65−TMD組換え融合蛋白質が細胞内の多様な信号伝達体系に関連する蛋白質のチロシンリン酸化に関与するかを確認するために、ウェスタンブロットを利用した。ジャーカットT細胞にnt−p65−TMD 2μMを1時間処理した後、抗CD3(2.5μg/ml)および抗CD28(2.5μg/ml)で刺激を与えて、ZAP−70、p38、JNKおよびERKのチロシンリン酸化の有無を観察した。
6−8週齢の雌C57BL/6マウスの脾臓から脾臓細胞を分離し、実施例1のnt−p65−TMDを1時間処理して、組換え融合蛋白質を細胞内に伝達した。この細胞を抗CD3(1μg/ml)および抗CD28(1μg/ml)で刺激した後、72時間培養した。その後、培養液に存在するサイトカインの量を、ELISAを利用して測定した。
6−8週齢の雄BALB/cマウスにLPS(20mg/kg)を腹腔注入して、敗血症ショック動物モデルにした。その後、2時間、14時間経過時、それぞれ実施例1のnt−p65−TMD組換え融合蛋白質を腹腔内注入し、6日間観察した。
大韓実験供給センターから供給された6週齢の特定病原体不在(specific pathogen−free、SPF)SD系ラットを用いて、急性毒性実験を下記のように行った:各グループあたり2匹ずつの動物に、本発明の実施例1の組換え融合蛋白質を1g/kgの用量で1回経口投与後、動物のへい死の有無、臨床症状および体重変化を観察し、血液学的検査と血液生化学的検査を実施し、解剖して、肉眼で腔臓器と胸腔臓器の異常の有無を観察した。
Park et al., Intranuclear interactomic inhibition of NF-kB suppresses LPS-induced severe sepsis, Biochemical and Biophysical Research Communications, 2015;464:711-717.
Claims (17)
- NF−κBの転写調節ドメインおよび蛋白質運搬ドメインを含む融合蛋白質であって、前記融合蛋白質は、競合阻害によってNF−κBの転写を抑制する、融合蛋白質。
- 前記NF−κBは、RelA(p65)、c−Rel、Rel−B、NF−κB1(p50)およびNF−κB2(p52)から構成された群より選択されたNF−κBであることを特徴とする、請求項1に記載の融合蛋白質。
- 前記NF−κBは、RelA(p65)であることを特徴とする、請求項1に記載の融合蛋白質。
- 前記NF−κBの転写調節ドメインは、配列リスト第1配列のアミノ酸配列からなることを特徴とする、請求項1に記載の融合蛋白質。
- 前記NF−κBの転写調節ドメインは、配列リスト第3配列のヌクレオチド配列によってコードされることを特徴とする、請求項4に記載の融合蛋白質。
- 前記蛋白質運搬ドメインは、Hph−1、Sim−2、Tat、VP22、Antp(antennapedia)、Pep−1(peptide−1)、PTD−5(protein transduction domain−5)、7R、9R、11RおよびCTP(cytoplasmic transduction peptide)から構成された群より選択されたことを特徴とする、請求項1に記載の融合蛋白質。
- 前記蛋白質運搬ドメインは、Hph−1であることを特徴とする、請求項1に記載の融合蛋白質。
- 前記蛋白質運搬ドメインは、配列リスト第2配列のアミノ酸配列からなることを特徴とする、請求項1に記載の融合蛋白質。
- 前記蛋白質運搬ドメインは、配列リスト第4配列のヌクレオチド配列によってコードされることを特徴とする、請求項8に記載の融合蛋白質。
- 前記融合蛋白質は、配列リスト第5配列のアミノ酸配列を含むことを特徴とする、請求項1に記載の融合蛋白質。
- 前記融合蛋白質は、配列リスト第6配列のヌクレオチド配列によってコードされることを特徴とする、請求項10に記載の融合蛋白質。
- 請求項1に記載の融合蛋白質を含む、NF−κBの転写または活性抑制剤。
- 請求項1に記載の融合蛋白質を有効成分として含む、NF−κBの過活性−関連疾患の予防または治療用薬剤学的組成物。
- 前記NF−κBの過活性−関連疾患は、炎症疾患または自己免疫疾患であることを特徴とする請求項13に記載の組成物。
- 前記NF−κBの過活性−関連疾患は、敗血症性ショック、アレルギー性喘息、アレルギー性鼻炎、アトピー性皮膚炎、全身性紅斑性狼瘡、リウマチ関節炎、潰瘍性大腸炎、涙腺炎、アルツハイマー疾患、脳卒中、動脈硬化症、血管再狭窄、I型糖尿病、II型糖尿病、蕁麻疹、結膜炎、乾癬、全身性炎症反応症候群、多発性筋炎、皮膚筋炎、結節性多発関節炎、混合結合組織症、シェーグレン症候群、痛風、パーキンソン病、筋萎縮性側索硬化症、糖尿性網膜症、多発性硬化症、クローン病、慢性甲状腺炎、セリアック病、重症筋無力症、尋常性天疱瘡、ウイルス疾患、細菌性疾患、放射線による障害、動脈硬化、血管腫、血管線維腫、再潅流障害および心臓肥大症から構成される群より選択される疾患であることを特徴とする、請求項13に記載の組成物。
- 請求項1に記載の融合蛋白質を有効成分として含む組成物を投与する段階を含む、NF−κBの転写または活性抑制方法。
- 請求項1に記載の融合蛋白質を有効成分として含む組成物を、これを必要とする個体に投与する段階を含む、NF−κBの過活性−関連疾患の予防、改善または治療方法。
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