JP2023542254A - がん治療のためのcd47バインダ及びリポソーム複合体 - Google Patents
がん治療のためのcd47バインダ及びリポソーム複合体 Download PDFInfo
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Abstract
Description
脂質ナノ粒子(lipid nanoparticle)に基づく薬物伝達システムは、相当な長所を有するため普遍的に使用されてきた。資質ナノ粒子は、高い薬容量(drug capacity)、高い安定性(stability)、高い特異性(specificity)を有しており、放出時点(release point)を制御することができる。薬物として使用される遺伝物質のため、正イオン性リポソームは標的がんに薬物を伝達するのに使用されていた。正電荷に荷電されたリポソームは、遺伝的薬物(genetic drug)を引き寄せて薬物が標的に遇うまで保護するために薬物を覆う球状コンプレックス(spherical complex)を形成する。
自然界に存在するSirpαの配列を変形してCD47との結合力が向上されたSV1を突然変異によって選定し、それに対してリポソーム剤形を製作する際に正しい方向に挿入されて反応し得るSV4を突然変異によって確保した(図1を参照)。SV4突然変異の製作は以下のような方法で行われた。前記確保されたSV1配列において、CD47との正しい方向結合のために11番目と104番目のリシンをロイシン(leucine)に置換した。置換のためにSV1遺伝子をpET28aベクトルに挿入したプラスミドを利用して、11番目と104番目に当たる配列で点突然変異(point-mutation)されるようにプライマ(下記表2を参照)を製作し、Quickchange II site-directed mutagenesis kit(Agilent)の方法に従ってそれぞれ或いは同時に置換させた突然変異遺伝子を製作した。
以下、上述したバインダ(SV4)-コンジュゲートリポソームに捕集される薬物の具現例について説明する。
T001の最終薬物の形態はmRNAの形態であって、発現に必要な各構成要素を最適化してUTR(untranslated region)及びKozak配列を最適化した。そのために、レポータ(reporter)遺伝子としてGFP(Green Fluorescent Protein)を使用し、図5のような候補構造を選定して発現効率を決定した。各使用したUTRの配列情報は下記表5のようである。
TS(Thymidylate synthase)は、DNA合成及び復旧のためのチミジレート(dTMP)の唯一のデノボ(de novo)源泉(source)である。TSタンパク質をターゲットとする薬物はがん治療の主軸をなしているが、標的外効果と毒性のため使用が制限されている。TK1(cytosolic thymidine kinase)とTK2(mitochondrial thymidine kinase)は腫瘍環境からチミジンを回復させることで代替dTMPの生成経路に寄与し、TSターゲッティング薬物に対する抵抗を調節する。siRNAを有するTKsの下向き調節(downregulation)で腫瘍細胞を感知するTS siRNAの容量を従来のTSタンパク質ターゲッティング薬物(5FUdR及びpemetrexed)に比べ増加させたという報告があったため、本発明ではdTTP生合成代謝に焦点を合わせた。
まず、各T001 mRNAをトランスフェクションした後、腫瘍細胞の成長を評価するために各グループの細胞数を推定し、生存検査で培養細胞の成長を分析した(図10を参照)。生存検査は以下のように行われた。
細胞生存能を定量化するためにMTT分析を行った。MTT分析方法は以下のようである。
前記実験結果によって、Annexin V染色後フローサイトメトリ分析(Flow cytometric analysis)を行って、T001がアポトーシスを誘導して細胞数の減少または細胞増殖の抑制を誘発するのかを調べた。具体的な分析方法は以下のようである。
T001はMT5Mとは異なる構造的差のため核酸Tにより特異的である。よって、全般的な核酸の損失よりdTTPの損失による核酸の不均衡はがん細胞の代謝に大きな影響を及ぼし、そのためがん細胞の成長を阻害することができる。それを照明するために、ヒトNT5Mの成熟型(mature form)とイントロン(intron)が含まれた非成熟型(non-mature form)を細胞質T001(CT)と細胞生存能及び細胞成長抑制効果を比較し、各酵素間の基質特異性によって細胞にいかなる影響を及ぼすのかを調べた。各mRNAを大腸がん細胞株HCT-116にトランスフェクションし、24時間後にトリパンブルー分析(Trypan blue assay)を行ってHCT-116細胞生存能と細胞成長抑制結果を図13に示した。具体的な実験方法は以下のようである。
sense(配列番号33):CGAGAAGAAGUCAGAUUACAUCAAG
antisense(配列番号34):CUUGAUGUAAUCUGACUUCUUCUCG
sense(配列番号35):CGCAAAUUCAUUGAAACCUUCCUGA
antisense(配列番号36):UCAGGAAGGUUUCAAUGAAUUUGCG
T001の作用メカニズム上、大腸がん以外のがん種でもがん細胞のアポトーシスを誘発することができると考えられ、トリプルネガティブ乳がん(TNBC)に対して同じ試験を行ってアポトーシス誘発能を確認した。具体的な試験方法は以下のようである。
以下、SV4バインダ及びT001薬物を利用した抗がん剤の具現例について説明する。
(1)CD47バインダ(SV4)
Sirpα由来のタンパク質をを変形した高親和性CD47結合体とそれにDSPEとのコンジュゲーションの際に正しい方向にリポソームの外部に位置するように変形したSV4をCD47バインダ(binder)として使用したが、SV4の推定構造を図1Aに示した。DSPEと結合した資料、それをリポソームに挿入した資料それぞれのKD値を比較した結果、配列変位によってリポソーム形態から改善されたことが分かった(前記表1を参照)。
リポソームは正電荷に荷電して標的まで円滑な薬物伝達を行うために使用された物質として、正イオン性リン脂質(DSPE-PEG1000)、DOTAP、及びコレステロールの構造をそれぞれ下記化学式1乃至3に示した。
上述したように、核内、細胞質内、及びミトコンドリア内で発現可能なmRNAとして、図21にT001 mRNAの構成を概略的に示した。
位置信号がよく作動したのかを確認するために、mRNAを核及びミトコンドリア位置信号でMCF7にトランスフェクションした。mStrrawberry蛍光を検出し、各mRNAの成功的なトランスフェクションと位置を確認した(図22を参照)。具体的な実験方法は以下のようである。
薬物の伝達がCD47を媒介に引き起こされるのかを確認するために、MCF-7細胞にエピルビシン(epirubicin)薬物が捕集されたSV4が結合されたiLPを処理した。この際、CD47の媒介可否を確認するために、CD47抗体(polyclonal)を処理した実験群と処理していない実験群を比較した。具体的なCD47 masking assay方法は以下のようである。
Claims (6)
- がん細胞で過発現するCD47に結合するバインダとして、配列番号1または配列番号2で表されるアミノ酸配列を含むバインダ。
- 前記バインダは、DSPE(1,2-ジステアロール-sn-グリセロ-3-ホスホリルエタノールアミン)-コンジュゲートされることを特徴とする請求項1に記載のバインダ。
- 前記がんは大腸がんまたは乳がんであることを特徴とする請求項1に記載のバインダ。
- リポソームに請求項1に記載のバインダがコンジュゲートされたバインダ-コンジュゲートリポソーム複合体。
- 前記リポソームは、正イオン性リン脂質、DOTAP、及びコレステロールからなる群より選択される一種以上の物質を利用して正電荷に荷電されることを特徴とする請求項4に記載のバインダ-コンジュゲートリポソーム複合体。
- 前記リポソームはPEG化されることを特徴とする請求項4に記載のバインダ-コンジュゲートリポソーム複合体。
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KR10-2020-0122151 | 2020-09-22 | ||
PCT/KR2021/011701 WO2022065724A1 (ko) | 2020-09-22 | 2021-08-31 | 암 치료를 위한 cd47 바인더 및 리포좀 복합체 |
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