JP2023504907A - フラジェリン由来のtlr5アゴニストを有効成分として含む抗がん剤組成物 - Google Patents
フラジェリン由来のtlr5アゴニストを有効成分として含む抗がん剤組成物 Download PDFInfo
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Abstract
Description
(1.大腸がんマウスモデル)
(1)腫瘍マウスモデルの確立及び腫瘍サイズの分析
大腸がん細胞株であるMC-38を韓国細胞株バンク(韓国、ソウル)から購入し、1%抗生剤(10U/mLペニシリン及び10g/mLストレプトマイシン;Gibco)、10%熱不活性化ウシ胎児血清(FBS;Gibco)を含有するDMEM培地(Gibco、Carlsbad、CA、USA)でMC-38細胞を成長させた。
マウスから採取した脾臓及びリンパ節組織を2つの不透明スライドガラスの粗面の間に置き、スライドガラスを互いに揉んで組織を単細胞単位に分離した後、分離した脾臓細胞をアンモニウム-クロリド-ポタシウム溶解溶液(ACK Lysing Buffer;Gibco)で処理して赤血球を溶解した。その後、脾臓及びリンパ節細胞を1%抗生剤(10U/mLペニシリン及び10g/mLストレプトマイシン;Gibco)、5%熱不活性化ウシ胎児血清(FBS;Gibco)を含有するRPMI 1640培地に再懸濁した。
マウスの脾臓細胞又はリンパ節細胞をフローサイトメーターにより評価した。マクロファージのM1又はM2分極を調べるために、MC-38細胞株を移植したマウスの脾臓及びリンパ節細胞を染色緩衝液で洗浄して染色緩衝液で再懸濁した後、抗マウスCD206 PE(BioLegend、San Diego、CA、USA)と、抗マウスF4/80 Alexa Fluor 700(BioLegend、San Diego、CA、USA)とで4℃で30分間免疫染色した。染色の後、脾臓及びリンパ節細胞を染色緩衝液で洗浄し、染色緩衝液で再懸濁した。その後、FlowJoソフトウェア(TreeStar、Ashland、OR、USA)を用いてFACS_LSR Fortessa (BD Pharmingen、San Diego、CA、USA)でフローサイトメトリー分析を用いて評価した。
(1)腫瘍細胞株
B細胞リンパ腫細胞株であるA20-Luc-GFPは、Imanis Life Sciences(アメリカ、ニューヨーク)から購入した。A20-Luc-GFPは、A20細胞株にLV-eGFP-P2A-Neo形質転換遺伝子を導入したもので、ルシフェラーゼ(luciferase)と緑色蛍光タンパク質を発現する。ルシフェラーゼは、生物発光有機体の細胞で発見される化学物質であるルシフェリンをATPの触媒効果で酸化しながら光を生成する酵素である。
前記A20-Luc-GFP細胞株を1%抗生剤(10U/mLペニシリン及び10g/mLストレプトマイシン;Gibco)、10%熱不活性化ウシ胎児血清(FBS;Gibco)を含有するRPMI培地(Gibco、Carlsbad、CA、USA)で増殖させた。
増殖したA20-Luc-GFP細胞株(1×106)を滅菌生理食塩水で再懸濁し、200μl用量でBALB/Cマウスの皮下に移植して腫瘍マウスモデルを導入した。本願発明であるTLR5アゴニストの抗がん効果を比較するために抗PD-1を陽性対照群として、生理食塩水を陰性対照群として用いた。また、抗PD-1及びTLR5アゴニストを同時に併用投与し、併用投与による効果も確認した。移植の後、9日目から3日間隔で総3回、腹腔内に上記薬物を投与した。形成された腫瘍のサイズは、移植後12日目から3~4日間隔で測定した。
RPMI培地に懸濁させたA20-Luc-GFP細胞株を96ウェルプレートに200μl用量で1×102細胞数から1×105細胞数まで分注し、ルシフェリンを150ug/mlの濃度で注入した後、生物学的発光を測定することによって、細胞数による生物学的発光程度を確認した。腫瘍移植マウスにルシフェリンを150mg/kg腹腔内注射し、ルシフェラーゼを発現する腫瘍の生物学的発光を測定することによって、生体内における腫瘍成長の程度を確認した。生物学的発光は、生体内蛍光分光分析機(IVIS Lumina XRMS)で測定した。
(1.大腸がんマウスモデル)
(1)腫瘍マウスモデルにおけるTLR5アゴニストによる抗がん効果の検証
本発明のTLR5アゴニストによる単独又は併用投与による抗がん効果を観察するために、腫瘍マウスモデルを誘導した後、投与物質毎の腫瘍の成長を比較した。
本発明のTLR5アゴニストが免疫チェックポイント抑制剤として腫瘍微小環境変化を誘導するか否かを確認するため、腫瘍マウスモデルにおける投与物質毎のマウスの脾臓とリンパ節細胞の免疫プロファイリングをフローサイトメトリーで評価した。このために、本発明者らは、マウスの脾臓とリンパ節細胞からM1及びM2マクロファージの分化条件を確立した。一般に、M1マクロファージは、腫瘍攻撃性を有し、抗がん効果があると知られており、M2マクロファージは、がんに優しい腫瘍支持性マクロファージとして腫瘍を成長させると知られている。したがって、前記M1/M2マクロファージの分極度変化を通じて、本発明のTLR5アゴニストが腫瘍細胞株の腫瘍微小環境を調節して抗がん効果を有するか否かを確認した。
(1)A20-Luc-GFP細胞株の生物学的発光の検証
A20-Luc-GFP細胞株を1×102細胞数から1×105細胞数までそれぞれ異なる細胞数の生物学的発光を測定し、細胞数による生物学的発光程度を確認してその結果を図7に示した。細胞数の増加によって生物学的発光程度も比例して増加することが確認された。このような結果は、A20-Luc-GFP細胞株を用いて腫瘍マウスモデルを導入したときに形成された腫瘍の生物学的発光を測定する場合、生体内における腫瘍の成長程度を確認できることを意味する。
本発明のTLR5アゴニスト(「KMRC011」)の単独又は併用投与による抗がん効果を観察するために、腫瘍マウスモデルを誘導した後、投与物質毎の腫瘍の成長を比較した。
マウスの皮下にA20-Luc-GFP細胞株を移植した後9日目から3日間隔で総3回ずつ生理食塩水200μl/mice、TLR5アゴニスト100μg/kg、抗PD-1 200μg/miceを各単独で投与し、抗TLR5アゴニスト及び抗PD-1を併用投与した。生物学的発光を測定して抗がん効果を観察し、上記の結果を図6に示した。図8ないし9に示したように、本願発明のTLR5アゴニストは、腫瘍の成長速度を遅延させた。また、上記の実験結果より、本発明のTLR5アゴニスト及び抗PD-1の併用投与は、各物質の単独投与に比べて抗腫瘍に上昇したシナジー効果があることが分かる。
Claims (12)
- フラジェリン由来のTLR5アゴニストの治療学的有効量を含む、抗がん剤組成物。
- 前記フラジェリン由来のTLR5アゴニストは、フラジェリンのD0ドメイン及びD1ドメインを含むことを特徴とする、請求項1に記載の組成物。
- 前記フラジェリン由来のTLR5アゴニストは、D1ドメインの内部に配列番号1に開示されたアミノ酸配列のリンカーペプチドを含むことを特徴とする、請求項1に記載の組成物。
- 前記フラジェリン由来のTLR5アゴニストは、配列番号2に開示されたアミノ酸配列を含むことを特徴とする、請求項1に記載の組成物。
- 前記フラジェリン由来のTLR5アゴニストは、腫瘍微小環境を調節することを特徴とする、請求項1に記載の組成物。
- 前記フラジェリン由来のTLR5アゴニストは、脾臓とリンパ節でM1(F4/80+CD206-)分極を増加させ、M2(F4/80+CD206+)分極を減少させることを特徴とする、請求項1に記載の組成物。
- 前記組成物は、がん細胞の成長阻害活性を有することを特徴とする、請求項1に記載の組成物。
- 免疫チェックポイント抑制剤をさらに含むことを特徴とする、請求項1に記載の組成物。
- 前記免疫チェックポイント抑制剤は、抗PD-1抗体であることを特徴とする、請求項8に記載の組成物。
- 前記抗PD-1抗体は、アベルマブ(avelumab)、トリメリムマブ(Tremelimumab)、イピリムマブ(Ipilimumab)、ニボルマブ(Nivolumab)、ペムブロリズマブ(Pembrolizumav)、アテゾリズマブ(Atezolizumab)、デュルバルマブ(Durvalumab)、ランブロリズマブ(Lamvrolizumab)、AMP-224、MEDI4376及びCT-011からなる群より選択される1種以上であることを特徴とする、請求項9に記載の組成物。
- 薬剤学的に許容される担体を含むことを特徴とする、請求項1~10のいずれか一項に記載の組成物。
- 請求項11の組成物を含む、薬学的製剤。
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