JP2016509674A - 染色されたFFPET切片からマイクロダイセクションした材料のRT−qPCR分析 - Google Patents
染色されたFFPET切片からマイクロダイセクションした材料のRT−qPCR分析 Download PDFInfo
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Abstract
Description
ポリ−L−リジンによるメンブレンスライドのコーティング
PENメンブレンスライド(MicroDissect GmbH)を約1mlのポリ−L−リジン溶液(0.1% w/v,Sigma−Aldrich Chemie GmbH)で被覆し、恒湿チャンバー内で室温において30分間インキュベートした。強力な振とうによりポリ−L−リジン溶液を除去した。その後、PENメンブレンスライドをUV光下で一夜乾燥させた。
ポリ−L−リジンによるPENメンブレンスライドのコーティングにより、低温加熱誘導エピトープ賦活化(LT−HIER,60℃,16時間,pH8)に適用した際のメンブレンスライドへの組織切片の付着が増大した。ポリ−L−リジンでコートされたメンブレンスライド:3つの組織切片のうちスライドから離脱したのは0であった。ポリ−L−リジン無しのメンブレンスライド:3つの組織切片のうち3つがスライドから離脱した。
2M塩化ナトリウム有り/無しCD31染色
腫瘍試料のFFPET切片を、抗体ベースの染色およびその後のRNA単離に用いた。以下の記載はFFPET切片を染色するために2M塩化ナトリウムの存在下で実施した操作のみを述べる。塩化ナトリウム無しの実験については、下記の点が異なる全く同じ操作を実施した:1)染色操作に塩化ナトリウムを用いなかった、2)二次抗体とのインキュベーションを30分間実施した(2M塩化ナトリウムを用いた場合の2時間の代わりに)。高い塩濃度は、二次抗体の結合効率が低いためインキュベーション時間の延長を必要とした。
塩化ナトリウム無しのCD31染色切片のRNA濃度は、非染色切片と比較して有意に低い。塩化ナトリウム有りのCD31染色FFPET切片のRNA濃度は、非染色切片のものと有意差がない(図1を参照)。
CD31染色されたFFPET切片からの2種類のマーカーの遺伝子発現分析
この例は、CD31染色されたFFPET切片から単離されたRNAの、遺伝子発現実験についての記載に従った方法との適性を示す。実施例2に記載した方法を、3つの独立した腫瘍試料からのFFPET切片に適用した。試料をメンブレンスライドに固定した。目的領域(腫瘍および血管)を連続レーザーキャプチャーマイクロダイセクションによりマイクロダイセクションした。それぞれ腫瘍ダイセクション物および血管ダイセクション物における2種類の異なるマーカー(マーカー1およびマーカー2)の発現に関するデータを、単離されたRNAの分析によって得た。実験を二重に実施した。当技術分野で周知の方法を用いてRNAをcDNAに転写した。十分な出発物質を得るために、また感度を高めるために、cDNAをプレアンプリフィケーションした。プレアンプリフィケーションしたcDNAを、最後にリアルタイムPCRを用いて二重に分析した。マーカー1およびマーカー2の発現をそれぞれ基準遺伝子HPRTに対して正規化することにより、マーカー1およびマーカー2の相対発現を求めた。
図4は、非染色腫瘍試料について実施した先の実験(データを示していない)と一致した、3つの独立したCD31染色腫瘍試料から得られたマーカー1およびマーカー2の相対発現のパターンに関するデータを示す。図4A)は、マーカー1が血管細胞と比較して腫瘍細胞においてより高度に発現することを示す。さらに、図4B)は、マーカー2が腫瘍細胞と比較して血管細胞においてより高度に発現することを示す。この場合、腫瘍細胞における発現は血管細胞と比較して発現を検出できないほどきわめて低い(検出されず=n.d.)。非染色腫瘍試料の分析(データを示していない)は再現できたので、本発明による染色方法は、結果に影響を及ぼすほどRNAの品質に有意に影響することはないと結論できる。結果的に、本発明による方法を用いるとRNA分解を最小限に抑えることができ、したがってFFPET試料からのRNAの品質は遺伝子発現分析またはRNA分析のための他のいずれの方法にも十分である。
Claims (15)
- ホルマリン固定され、パラフィン包埋された組織切片の免疫組織化学染色のための方法であって、
a)固体支持体を用意する工程、
b)ホルマリン固定され、パラフィン包埋された組織切片を、固体支持体に固定する工程、
c)ホルマリン固定され、パラフィン包埋された組織切片から、パラフィンを除去する工程、
d)エピトープを賦活化するために、固体支持体に固定された組織切片を50〜70℃で12〜24時間加熱する工程、および、
e)固体支持体に固定された組織切片を染色する工程、
を含み、
その際、少なくとも工程e)を0.5〜3.0M塩化ナトリウムの存在下で実施する、前記方法。 - さらに、
f)固体支持体に固定された染色組織切片から、目的領域をダイセクションし、
g)目的領域からRNAを単離する工程、
h)単離されたRNAをcDNAに逆転写する工程、
i)cDNAを増幅および定量する工程、
を含む、請求項1に記載の方法。 - 固体支持体がポリ−L−リジンでコートされている、請求項1または2に記載の方法。
- 塩化ナトリウムが1.5〜2.5Mの濃度で存在する、請求項1〜3のいずれか1項に記載の方法。
- 塩化ナトリウムが約2Mの濃度で存在する、請求項1〜4のいずれか1項に記載の方法。
- パラフィンの除去が、固体支持体に固定された組織切片をキシロール中でインキュベートすることにより実施される、請求項1〜5のいずれか1項に記載の方法。
- 固体支持体に固定された組織切片の加熱が55〜65℃で14〜18時間実施される、請求項1〜6のいずれか1項に記載の方法。
- 固体支持体に固定された組織切片の加熱が約60℃で約16時間実施される、請求項1〜6のいずれか1項に記載の方法。
- 染色が標識抗体の使用を含む、請求項1〜8のいずれか1項に記載の方法。
- 固体支持体がメンブレンスライドである、請求項1〜9のいずれか1項に記載の方法。
- 工程f)が、目的領域をマイクロダイセクションまたはマクロダイセクションすることを含む、請求項2〜10のいずれか1項に記載の方法。
- 目的領域が1〜2mm2のサイズを有する、請求項2〜11のいずれか1項に記載の方法。
- cDNAを増幅および定量する工程がリアルタイムPCRにより実施される、請求項2〜12のいずれか1項に記載の方法。
- 請求項1〜13のいずれか1項に記載の方法を実施するためのキットであって、
a)ポリ−リジンでコートされた固体支持体、
b)エピトープ賦活化のための溶液、および、
c)0.5〜3.0Mの濃度の塩化ナトリウムを含む免疫組織化学染色のための溶液、
を含む、前記キット。 - さらに、RNAからcDNAへの逆転写、cDNAの増幅および定量を実施するのに必要なすべての試薬を含む、請求項14に記載のキット。
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