JP6633626B2 - 癌特異的トランススプライシングリボザイム及びその用途 - Google Patents
癌特異的トランススプライシングリボザイム及びその用途 Download PDFInfo
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Description
以下、本発明を実施例に基づいて詳細に説明する。但し、以下に示す実施例は本発明を例示するものに過ぎなく、本発明がこれらの実施例により限定されるものではない。
1−1. pAVQ PEPCK−SD/SA−Ribozyme−TK−WPRE−122aT(3X)プラスミドの作製
本発明において、組織特異的な、癌遺伝子治療剤が連結されたトランススプライシングリボザイム(trans−splicing ribozyme)の発現を誘導するために、肝細胞特異的プローモーターであるPEPCKプローモーター(配列番号2)、調節誘導体であるSD/SA(Splicing Donor/Splicing Acceptor、配列番号3)、WPRE(Woodchuck hepatitis virus Posttranscriptional RegulatoryElement、配列番号7)及びmiR−122aTを用いて、最適な構成を製造した。miR−122aTは、肝細胞特異的に発現されるマイクロRNA−122a(miR−122a)を認識する核酸配列(miR−122a target site(miR−122aT)、配列番号8)を意味する。また、TKは、抗HSV遺伝子製剤であるHSVtk(herpessimplexvirus thymidine kinase、配列番号6)を意味するものであって、使用可能な癌遺伝子治療剤のうちの一例として使用した。
本発明者等は、pAVQベクター基盤の対照群プラスミドのうちの一つであるPRT−mut 122aT(PEPCK−Rib−TK−mut 122aT)を作製した。
アデノ−ウイルスベクターを作製するために、pAdenoVatorトランスファーベクター(transfer vector)(キュビオジーン(Qbiogene))にクローニングされたコンストラクト(construct)を、pAdenoVator△E1/E3バックボーンベクター(backbonevector)(キュビオジーン)と共に、コンピテントセル(competentcell)であるBJ5183イーコリ・ストレイン(E.colistrain)に同時形質導入(co−transformation)して、相同組み換え(homologous recombination)をさせた。トランスファーベクター(transfervector)は、制限酵素であるPmeI(NEB)により線形化(linearization)させた後、フェノール抽出及びエタノール沈殿を通じて精製して用意しており、取得したDNA1μgとpAdenoVator△E1/E3バックボーンベクター100ngを、BJ5183に電気穿孔法(electroporation)により同時形質導入した。BJ5183で相同組み換えされた組み換えベクター(recombinant vector)を、制限酵素であるPacI(NEB)により線形化させた後、フェノール抽出及びエタノール沈殿を通じて精製しており、これを293(ヒト胚性腎臓細(Human embryonic kidney))細胞にリン酸カルシウム(calcium phosphate)を用いて形質感染(transfection)した。
ヒト肝癌細胞株(Human hepatocellular carcinoma)であるHep3B細胞、Huh7、Huh7.5及びHepG2細胞と、ヒト肺癌細胞株(human lung adenocarcinoma)であるSKLU−1を用いた。
SD/SA及びWPREが全て連結されたリボザイムの効率性を確認するために、発現度合いを測定した。具体的に、前記実施例1−2で作製したPRT−122aT、PRT−mut 122aT、EPRT−122aT及びEPRT−mut 122aTをそれぞれ、ヒト肝癌細胞であるHep3B細胞(hTERT+、miR−122a-)に形質導入した後、リアルタイム−PCR(realtime−PCR)を通じてHSVtkの発現量を測定することによって、リボザイムの発現量を比較した。対照群として、実施例1−2で製造したリボザイム無しに、抗HSV遺伝子製剤であるHSVtk(herpes simplex virus thymidine kinase)のみを発現するPTを使用した。
正方向プライマー配列(配列番号16; 5'−TGACTTACTGGCAGGTGCTG−3')
逆方向プライマー配列(配列番号17; 5'−CCATTGTTATCTGGGCGCTTG−3')
効率性増加のためのSD/SA、WPREが挿入され、肝組織特異的発現調節のための正常な肝組織では発現されるが、肝癌細胞では発現量が減少される、miR−122aを標的とする核酸配列(miR−122aT)を3回繰り返して挿入した(3コピー)、前記実施例1で製造したプラスミドと、これに対する陰性対照群(negative control)としてmut−122aTを挿入したプラスミドとを比較実験することによって、miR−122による調節可否と、肝癌細胞に対して特異的に細胞死を誘導して治療効果をあらわせるか否かを評価した。
前記実施例1−2で作製した組み換えベクター、PT(PEPCK−TK)、PRT−122aT(PEPCK−Rib−TK−122aT)、EPRT−122aT(PEPCK−SD/SA−Rib−TK−WPRE−122aT)及びEPRT−mut 122aT(PEPCK−SD/SA−Rib−TK−WPRE−mut 122aT)をそれぞれ、Hep3B(hTERT+、miR−122a-)、Huh7(hTERT+、miR−122a+)、Huh7.5(hTERT+、miR−122a+)細胞に形質導入した。
癌遺伝子治療剤が連結されたトランススプライシングリボザイムにmiR−122aTが追加に連結された組み換えベクターを形質導入して発現されたリボザイムが、肝癌細胞特異的な効果をあらわすことを、前記5−1のトランジェントアッセイ(transientassay)のほかに、ウイルス感染を利用したアッセイを用いて改めて確認した。
1)毒性検査
4〜5週齢C57BLマウス(オリエントバイオ株式会社(Orient Bio inc.))を使用し、陰性対照群(PBS)、Ad−PRT−122aT(10 x 1010)、Ad−EPRT−122aT(10 x1010)、Ad−EPRT−122aT(2 x 1010)、Ad−EPRT−122aT(1 x 1010)、Ad−EPRT−122aT(0.5x1010)をそれぞれ注入した。注入してから2日、7日及び14日(n=7)後に、血液サンプルを採取してALTとASTの水準を測定した。
4〜5週齢BALB/cマウス(オリエントバイオ株式会社)にHep3B細胞(肝癌細胞)を3 x 106細胞量で脾臓内に移植して、腫瘍モデル(同所多発性肝癌モデル)を構築した。これに陰性対照群(PBS)、Ad−PRT−122aT(10 x 1010)、Ad−EPRT−122aT(10 x1010)、Ad−EPRT−122aT(2 x 1010)、Ad−EPRT−122aT(1 x 1010)、Ad−EPRT−122aT(0.5x1010)をi.v(Intravenous、静脈)を通じて注入した後、TK遺伝子の活性のために、10日間毎日GCV 50mg/kgを注入した。10日後、その結果は、腫瘍組織の重量測定及びH&E染色を通じて組織を観察した。
Claims (7)
- (i)肝細胞特異的プローモーターである配列番号2の核酸配列からなるphosphoenolpyruvatecarboxykinase (PEPCK) プローモーターと;
(ii)癌特異的遺伝子を標的とするトランススプライシングリボザイムであるTelomerase Reverse Transcriptase (TERT) mRNA及び前記リボザイムの3’エクソンに連結された目的遺伝子であるherpes simplex virus-thymidine kinase (HSVtk) 遺伝子を含む、リボザイム−目的遺伝子発現カセットと;を含み、
前記発現カセットは、該発現カセットの5’末端にスプライシング供与体/スプライシング受容体配列(splicing donor/splicing acceptor sequence、SD/SA sequence)が連結され、3’末端にWPRE(Woodchuck hepatitis virus Posttranscriptional Regulatory Element)が連結されたものであり、
(iii)前記WPREの3’末端にマイクロRNA−122a(microRNA−122a、miR−122a)を認識する核酸配列が追加に連結されたことを特徴とする、組み換えベクター。 - 前記トランススプライシングリボザイムは、配列番号5の核酸配列を含むものである、請求項1に記載の組み換えベクター。
- 前記HSVtk遺伝子は、配列番号6の核酸配列を含むものである、請求項1に記載の組み換えベクター。
- 前記マイクロRNA−122(microRNA−122a、miR−122a)を認識する核酸配列は、配列番号8の核酸配列を含むものである、請求項1に記載の組み換えベクター。
- 請求項1〜4のいずれか一項に記載の組み換えベクターが導入されたことを特徴とする、形質転換細胞。
- 請求項1〜4のいずれか一項に記載の組み換えベクターから発現されたことを特徴とする、リボザイム。
- 請求項1〜4のいずれか一項に記載の組み換えベクター又は該組み換えベクターから発現されたリボザイムを有効成分として含むことを特徴とする、肝癌予防又は治療用薬学的組成物。
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