JP2019529341A - リガンドコンジュゲート量子ドットナノ粒子及びこれを用いてdnaメチル化を検出する方法 - Google Patents
リガンドコンジュゲート量子ドットナノ粒子及びこれを用いてdnaメチル化を検出する方法 Download PDFInfo
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- A61K49/0063—Preparation for luminescence or biological staining characterised by a special physical or galenical form, e.g. emulsions, microspheres
- A61K49/0065—Preparation for luminescence or biological staining characterised by a special physical or galenical form, e.g. emulsions, microspheres the luminescent/fluorescent agent having itself a special physical form, e.g. gold nanoparticle
- A61K49/0067—Preparation for luminescence or biological staining characterised by a special physical or galenical form, e.g. emulsions, microspheres the luminescent/fluorescent agent having itself a special physical form, e.g. gold nanoparticle quantum dots, fluorescent nanocrystals
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- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
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Abstract
Description
DCC:ジシクロヘキシルカルボジイミド
DCM:ジクロロメタン
DIC:ジイソプロピルカルボジイミド
EDC:1−エチル−3−(3−ジメチルアミノプロピル)カルボジイミド塩酸塩
HMMM:ヘキサメトキシメチルメラミン
In(MA)3:ミリスチン酸インジウム
QD:量子ドット
sulfo−NHS:N−ヒドロキシスクシンイミドのスルホ誘導体
SMCC:スクシンイミジル4−(N−マレイミドメチル)シクロヘキサン−1−カルボキシレート
(TMS)3P:トリス(トリメチルシリル)ホスフィン
分子シーディングプロセスを使用して、無毒性量子ドット(QD)を生成した。概要を説明すると、500乃至700nmの範囲で発光する非官能化インジウム系量子ドットの調製を以下のようにして行った。ジブチルエステル(約100ml)及びミリスチン酸(MA)(10.06g)を三つ口フラスコに入れて、真空下で約70℃で1時間脱気した。この期間の後、窒素を導入し、そして温度を約90℃に上げた。約4.7gのZnS分子クラスタ[Et3NH]4[Zn10S4(SPh)16]を加え、混合物を約45分間撹拌した。次に、温度を約100℃に上げて、続いてIn(MA)3(1M、15ml)を滴下し、続いてトリメチルシリルホスフィン(TMS)3P(1M、15ml)を滴下した。反応混合物を撹拌しながら温度を約140℃に上げた。140℃で、ジ−n−ブチルセバケートエステルに溶解させたミリスチン酸インジウム(In(MA)3)(1M、35ml)(5分間撹拌したままにした)と、ジ−n−ブチルセバケートエステルに溶解させた(TMS)3P(1M、35ml)を更に滴下した。その後、温度をゆっくりと180℃に上げて、In(MA)3(1M、55ml)、続いて(TMS)3P(1M、40ml)を更に滴下した。このようにして前駆体を添加することで、発光極大が500nmから720nmまで徐々に増加するインジウム系粒子を作製した。所望の発光極大が得られた時点で反応を停止し、反応温度で半時間撹拌し続けた。この期間の後、混合物を約4日間(反応温度よりも約20乃至40℃低い温度で)アニールした。この段階でUVランプも使用して、アニーリングを促進した。
メラミンヘキサメトキシメチルメラミン(HMMM)修飾蛍光ナノ粒子を、薬物送達ビヒクルとして生成及び使用するための方法の一実施形態が、本実施例で提供される。独特なメラミンベースのコーティングは、優れた生体適合性と、低毒性と、非常に低い非特異的結合とを示す。これらの独特の作用により、インビトロとインビボの両方で幅広い生物医学的用途が可能になる。
特定の実施形態では、水溶性QDは、QDに付された標的化リガンドを含むように修飾される。故に、ある実施形態では、非毒性且つ水溶性(生体適合性)であり、コンジュゲーション可能な基(COOH、OH、NH2、SH、アジド、アルキン)を表面に備えた量子ドットナノ粒子が合成される。例えば本明細書の実施例2で与えられたCOOH官能基のような、QDに付加できる官能基を用いて、サンプル、細胞及び組織中のメチル化されたDNAを選択的に同定することを可能にする標的化リガンドを含むように、QDを修飾できる。標的化リガンド修飾QDは、照射されると、検出用の光を発光する。
ガラススライドを用いて、染色体スプレッドを、標準的なプロトコルを用いて調製する。スライドを、適切なブロッキング剤で処理してから、615放射QDに結合されたマウスモノクローナル抗5−メチルシトシン(PBS中に1:1000の希釈)中で、湿性チャンバ内で37℃にて1時間インキュベートした。スライドを、必要に応じてPBSで1回又は複数回洗浄する。
別の実施形態において、リガンド−ナノ粒子コンジュゲートを、生組織サンプル、又は細胞培養において培養した生細胞培養体に導入する。リガンド−ナノ粒子コンジュゲートの適切なメチル化特異的結合リガンドとして、以下に限定されないが、抗メチル化ベースの特異的抗体が挙げられる。リガンド−ナノ粒子コンジュゲートを、メチル化DNA領域、又は活性DNAメチル化領域(メチル化されたシトシン又はアデノシン、例えば5−メチルシトシン、5−ヒドロキシメチルシトシン、5−ホルミルシトシン、5−カルボキシルシトシン、及び/又はN6−メチルアデニンを示す)に接触させる。リガンド−ナノ粒子コンジュゲートを、光源によって励起させる。リガンド−ナノ粒子コンジュゲートによる光放射又は光吸収を測定して、定量化する。検出を、リアルタイムに実行することができる。
別の実施形態において、リガンド−ナノ粒子コンジュゲートを、生物にインビボ導入する。そのような生物として、原核生物、又は哺乳類を含む真核生物が挙げられる。リガンド−ナノ粒子コンジュゲートの適切なメチル化特異的結合リガンドとして、以下に限定されないが、抗5−メチルシトシン抗体、抗5−ヒドロキシメチルシトシン抗体、抗5−ホルミルシトシン抗体、抗5−カルボキシルシトシン抗体、及び/又は抗N6メチルアデニン抗体が挙げられる。リガンド−ナノ粒子コンジュゲートを、メチル化DNA領域又は活性DNAメチル化領域(5−メチルシトシン、5−ヒドロキシメチルシトシン、5−ホルミルシトシン、5−カルボキシルシトシン、及び/又はN6メチルアデニンを示す)に接触させる。リガンド−ナノ粒子コンジュゲートを、光源によって、インビボで、又は組織サンプルを検出のために生物から取り出したならばエクスビボで励起する。リガンド−ナノ粒子コンジュゲートによる光放射又は光吸収を測定して、定量化する。検出は、リアルタイムに実行することができる。
Claims (20)
- ナノ粒子がDNAメチル化特異的結合リガンドに連結されている、ナノ粒子コンジュゲート。
- ナノ粒子は、DNAメチル化特異的結合リガンドに、アミド結合を介して共有結合的に連結されている、請求項1に記載のナノ粒子コンジュゲート。
- ナノ粒子が、コア半導体材料及び外層を含む量子ドットであり、
外層は、メチル化特異的結合リガンドに連結されている官能化有機コーティングを含む、ナノ粒子コンジュゲート。 - メチル化特異的結合リガンドは、5−メチルシトシン及び/又は5−ヒドロキシメチルシトシンに特異的に結合する、請求項3に記載のリガンドナノ粒子コンジュゲート。
- メチル化特異的結合リガンドは、抗5−メチルシトシン抗体、抗5−ヒドロキシメチルシトシン抗体、抗5−ホルミルシトシン抗体、抗5−カルボキシルシトシン抗体、抗N6−メチルアデニン抗体、及びそれらの任意の組合せから選択される、請求項4に記載のリガンドナノ粒子コンジュゲート。
- メチル化特異的結合リガンドは、抗5−メチルシトシン抗体である、請求項5に記載のリガンドナノ粒子コンジュゲート。
- ナノ粒子は、II−VI族材料、III−V族材料、若しくはI−III−IV族材料、又はそれらの任意の合金を含む、請求項6に記載のリガンドナノ粒子コンジュゲート。
- 細胞吸収促進剤、組織浸透促進剤、又はそれらの組合せを更に含む、請求項7に記載のリガンドナノ粒子コンジュゲート。
- リガンドナノ粒子コンジュゲートを調製するプロセスであって、ナノ粒子を、DNAメチル化特異的結合リガンドに結合させる工程を含み、ナノ粒子は、コア半導体材料及び外層を含む量子ドットを含み、外層は、カルボキシル基を含む、プロセス。
- DNAメチル化特異的結合リガンドナノ粒子コンジュゲートを精製する工程を更に含む、請求項9に記載のプロセス。
- DNAメチル化特異的結合リガンドナノ粒子コンジュゲートを単離する工程を更に含む、請求項10に記載のプロセス。
- カップリング工程が、カップリング剤の存在下で行われる、請求項11に記載のプロセス。
- カップリング剤は、1−(3−ジメチルアミノプロピル)−3−エチルカルボジイミド塩酸塩である、請求項12に記載のプロセス。
- DNAメチル化を検出する方法であって、
i)請求項1に記載のリガンド−ナノ粒子コンジュゲートを、メチル化DNA領域と接触させる工程と、
ii)リガンド−ナノ粒子コンジュゲートを光源によって励起させる工程と、
iii)リガンド−ナノ粒子コンジュゲートによる光放射又は光吸収を検出する工程と、
を含む方法。 - サンプルは、固定された組織サンプル、又は細胞培養において培養された生細胞中のサンプルである、請求項14に記載の方法。
- 検出は、リアルタイムに実行される、請求項15に記載の方法。
- 検出シグナルが増幅される、請求項16に記載の方法。
- 請求項1に記載のリガンドナノ粒子コンジュゲートの、DNAサンプルのメチル化された領域を検出するための免疫アッセイにおける試薬としての使用。
- サンプルは、固定された組織サンプル、又は細胞培養において培養された生細胞中のサンプルである、請求項18に記載の使用。
- 検出は、リアルタイムに実行される、請求項18に記載の使用。
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US15/637,890 US20180009659A1 (en) | 2016-07-05 | 2017-06-29 | Ligand conjugated quantum dot nanoparticles and methods of detecting dna methylation using same |
PCT/GB2017/051968 WO2018007800A1 (en) | 2016-07-05 | 2017-07-04 | Ligand conjugated quantum dot nanoparticles and methods of detecting dna methylation using same |
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