JP7338128B2 - 癌診断における放射性標識プロガストリン - Google Patents
癌診断における放射性標識プロガストリン Download PDFInfo
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- JP7338128B2 JP7338128B2 JP2020550911A JP2020550911A JP7338128B2 JP 7338128 B2 JP7338128 B2 JP 7338128B2 JP 2020550911 A JP2020550911 A JP 2020550911A JP 2020550911 A JP2020550911 A JP 2020550911A JP 7338128 B2 JP7338128 B2 JP 7338128B2
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- cancer
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- progastrin
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Description
第一の側面においては、本発明は、化合物またはその薬学的に許容される塩に関し、前記化合物は:
プロガストリン部分、および
キレート化部分
を含み、
前記キレート化部分は、任意に、放射性同位体と結合する。
前記方法は:
a)アミン反応性キレート化部分を、プロガストリン部分とコンジュゲートする工程、および
b)プロガストリンとキレート剤とのコンジュゲートを回収する工程
を含む。
c)プロガストリンとキレート剤とのコンジュゲートを相補的な放射性同位体とインキュベートし、
それによって本発明の化合物を生成する工程をさらに含む。
a)本明細書に記載の化合物またはその薬学的に許容される塩を前記対象に投与すること、および、
b)イン・ビボでのPETまたはSPECTイメージングによって前記化合物を検出すること
を含む、上記方法を提供する。
a)本明細書に記載の化合物またはその薬学的に許容される塩を前記対象に投与する工程、
b)イン・ビボでのPETまたはSPECTイメージングによって前記化合物を検出する工程、および
c)工程b)の検出に基づいて、癌を診断する工程を含む。
a)本明細書に記載の化合物またはその薬学的に許容される塩を前記対象に投与する工程、
b)イン・ビボでのPETまたはSPECTイメージングによって前記化合物を検出する工程、および
c)工程c)の検出に基づいて、癌の予後を判断する工程
を含む。
a)本明細書に記載の化合物またはその薬学的に許容される塩を前記対象に投与すること、および
b)イン・ビボでのPETまたはSPECTイメージングによって前記化合物を検出すること
を含む、上記方法を提供する。
a)前記対象の試料中のプロガストリンのレベルを決定する工程、および
b)本明細書に記載の化合物またはその薬学的に許容される塩を前記対象に投与する工程、
c)イン・ビボでのPETまたはSPECTイメージングによって前記化合物を検出する工程
を含む。
好ましい態様によれば、この方法は:
a)前記対象の試料中のプロガストリンのレベルを測定する工程、
b)工程a)のレベルが0pMより高いかを決定する工程と、
c)本明細書に記載の化合物またはその薬学的に許容される塩を前記対象に投与する工程、および
d)イン・ビボでのPETまたはSPECTイメージングによって前記化合物を検出する工程
を含む。
キレート剤は、0.2M炭酸水素ナトリウム溶液中10mg/mLの濃度で、pH=9で調製される。次いで、10当量のキレート剤を、プロガストリンの分注に加える。共役結合反応を、37℃で2時間行う。最終生成物の精製は、AMICONフィルターで行う。これらフィルターを通して、過剰な未反応キレート剤が除去される。共役ペプチドが得られ、これをNODAGA-プロガストリンと呼ぶ。
結腸直腸癌細胞株T84を解凍後にT75フラスコ内で培養して4代継代し、マウスでの異種移植前に最適な増殖速度を再開させた。用いた培養液は、Glutamax+10%ウシ胎仔血清および1%の抗生剤(ストレプトマイシン、ペニシリン)を含むDMEM-F12であった。マウスでの異種移植のため、細胞培養を80%のコンフルエンスで停止し、1.109細胞/100μlの濃度にするために、細胞を血清およびマトリゲルを含まないDMEM-F12溶液中に1:1の割合で取り出す。
100μLの2M酢酸アンモニウム溶液をNODAGA-プロガストリン(50μLのPBS中で可溶化した10μg)の分注に加える。次いで、IRE Elitジェネレータからの500μLのガリウム-68溶出物、[68Ga]GaCl3を、先に調製した溶液に加える。全体を、10分間室温でインキュベートする。最終pHは4.8である。放射化学純度は、90%(n=3)より高く、また薄層クロマトグラフィー(移動相:0.1Mクエン酸ナトリウム、pH=5)で決定する。2μLの10M水酸化ナトリウムを、最終混合物に加え、pHを中和する。調製したこの溶液を、生体内分布およびPET/CTイメージング試験に用いる。
*%ID/g=ROIにおいて算出された活性(MBq)/(注入活性(MBq)×組織の体積(ml))×100
**筋肉は、放射性トレーサーの非特異的な固定における対照領域とみなされる。
全体で、NODAGA-プロガストリンの生体内分布の動態は、異所性腫瘍T84を100および600mm3の間(表2におけるPET/CT取得)に発達させた合計5匹のマウスにおいて観察および定量された。
放射性標識したプロガストリンペプチドは、このモデルにおいて腫瘍に組み込まれるということを結論付けることができる。
Claims (18)
- 化合物またはその薬学的に許容される塩であって、前記化合物は、
配列番号1のプロガストリン部分、および
キレート化部分
を含み、
前記キレート化部分は、放射性同位体と結合し、
前記プロガストリン部分及び前記キレート化部分は、共有結合している、
前記化合物またはその薬学的に許容される塩。 - 前記キレート化部分が、二官能性キレート剤である、請求項1に記載の化合物またはその薬学的に許容される塩。
- 前記二官能性キレート剤が、NODAGA、NOTA、DOTA、DOTA-NHS、p-SCN-Bn-NOTA、p-SCN-Bn-PCTA、p-SCN-Bn-オキソ-DO3A、デスフェリオキサミン-p-SCN、DTPAおよびTETAの一覧から選択される、請求項2に記載の化合物またはその薬学的に許容される塩。
- 前記二官能性キレート剤が、NODAGA、NOTAまたはDOTAである、請求項2または3に記載の化合物またはその薬学的に許容される塩。
- 前記二官能性キレート剤が、NODAGAである、請求項2から4のいずれか一項に記載の化合物またはその薬学的に許容される塩。
- 前記放射性同位体が、68Ga、64Cu、89Zr、186/188Re、90Y、177Lu、153Sm、213Bi、225Ac、111In、99mTc、123Iまたは223Raからなる一覧から選択される、請求項1から5のいずれか一項に記載の化合物またはその薬学的に許容される塩。
- 前記放射性同位体が、68Gaまたは64Cuである、請求項1から6のいずれか一項に記載の化合物またはその薬学的に許容される塩。
- 前記放射性同位体が、68Gaである、請求項1から7のいずれか一項に記載の化合物またはその薬学的に許容される塩。
- 請求項1から8のいずれか一項に記載の化合物またはその薬学的に許容される塩の調製方法であって:
a)アミン反応性キレート化部分を、前記プロガストリン部分とコンジュゲートする工程、および
b)プロガストリンとキレート剤とのコンジュゲートを回収する工程
を含む、方法。 - 前記アミン反応性キレート化部分が、DOTA-NHS、NOTA-NHSまたはNODAGA-NHSエステルである、請求項9に記載の方法。
- 前記アミン反応性キレート化部分が、NODAGA-NHSエステルである、請求項9または10に記載の方法。
- c)プロガストリンとキレート剤とのコンジュゲートを相補的な放射性同位体とインキュベートし、
それによって請求項1から8のいずれか一項に記載の化合物またはその薬学的に許容される塩を生成する工程をさらに含む、請求項9から11のいずれか一項に記載の方法。 - 対象における1以上の癌の細胞、器官または組織の画像化のための医薬組成物であって、請求項1から8のいずれか一項に記載の化合物またはその薬学的に許容される塩を含み、
前記医薬組成物は、前記対象に投与され、イン・ビボでのPETまたはSPECTイメージングによって検出される、医薬組成物。 - 対象における癌の局在を決定するための医薬組成物であって、請求項1から8のいずれか一項に記載の化合物またはその薬学的に許容される塩を含み、
前記医薬組成物は、前記対象に投与され、イン・ビボでのPETまたはSPECTイメージングによって検出される、医薬組成物。 - 前記医薬組成物の投与前に、前記対象から得られた試料中のプロガストリンのレベルが決定される、請求項14に記載の医薬組成物。
- プロガストリンのレベルが、抗プロガストリン抗体により決定される、請求項15に記載の医薬組成物。
- 請求項1から8のいずれか一項に記載の化合物またはその薬学的に許容される塩と、薬学的に許容される担体とを含む、医薬組成物。
- 請求項1から8のいずれか一項に記載の化合物またはその薬学的に許容される塩を含む、キット。
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