JP2005147798A - 成人t細胞白血病診断薬 - Google Patents
成人t細胞白血病診断薬 Download PDFInfo
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Abstract
【解決手段】 細胞又は血清におけるTSLC1遺伝子の転写産物又はTSLC1タンパク質の有無を検出することができる試薬を含む。試薬は、TSLC1遺伝子の全部又は一部を増幅するように設計されたプライマー、TSLC1遺伝子の全部又は一部に相補的な配列となるように設計されたプローブ、白血病細胞表面抗原TSLC1を特異的に認識する抗体及び可溶型TSLC1を特異的に認識する抗体のいずれでも良い。
【選択図】 なし
Description
(1) 細胞又は血清におけるTSLC1遺伝子の転写産物又はTSLC1タンパク質の有無を検出することができる試薬を含む、成人T細胞白血病診断薬。
本発明者は、成人T細胞白血病診断薬(ATL)発症に関わる遺伝子異常を発見し、それを基礎にしたATLの発症に関わる診断法を開発するために、ATL患者白血病細胞を用い、DNAマイクロアレイを用いた包括的な遺伝子発現検索を行った。その結果12,000以上の遺伝子群の中で正常Tリンパ球と比較して、TSLC1遺伝子のmRNAと蛋白質がATL白血病細胞において高発現をしていることを発見した。
診断対象から採取した細胞におけるTSLC1遺伝子転写産物を検出する手法としては、特に限定されないが、以下の方法を採用することができる。
RT-PCRを適用する際には、先ず、診断対象の患者よりヘパリン化末梢血を採取する。このヘパリン化末梢血を比重遠心分離にかけ単核球を分離する。分離した単核球を患者検体とする。一方、コントロール検体としては、健常人のCD4陽性Tリンパ球を使用する。健常人のCD4陽性Tリンパ球は、健常人より採取したヘパリン化末梢血をCD8化、抗体混合物を用いて不要な細胞を沈降させた後、分離することができる。
プライマー1;ATGATCGATATCCAGAAAGACACT(配列番号3)
プライマー2;GTACTTCTAGATACCGCTGGG(配列番号4)
上記「1-1. RT-PCR」と同様の方法により、患者検体、コントロール検体を採取し、同様にRNAを分離、cDNAを合成する。蛍光ラベルした特異的合成オリゴヌクレオチドにより、同様にRealtime PCR装置によりDNA合成を行う。
特異的合成オリゴヌクレオチド;TTCGCCATGCTGTGCTTGCTCA(配列番号5)
診断対象から採取した細胞におけるTSLC1遺伝子転写産物を検出する手法としては、上記「1-1. RT-PCR」と同様の方法により、患者検体、コントロール検体を採取し、同様にRNAを分離した後、TSLC1遺伝子のmRNAに特異的にハイブリダイズするオリゴヌクレオチドを用いて、TSLC1遺伝子転写産物を検出してもよい。また、上記「1-1. RT-PCR」と同様の方法によりRNAを分離してcDNAを合成し、合成したcDNAに特異的にハイブリダイズするプローブを用いて、TSLC1遺伝子転写産物を検出してもよい。
細胞又は血清に含まれるTSLC1タンパク質を検出する際には、TSLC1タンパク質を特異的に認識する抗体(以下、TSLC1抗体と呼ぶ)を作製する。TSLC1抗体は、従来公知の手法を用いて作製することができる。なお、TSLC1抗体は、モノクローナル抗体であっても、ポリクローナル抗体であっても良い。
以上のように調製したTSLC1モノクローナル抗体を用いて、診断対象の細胞の表面に存在するTSLC1タンパク質の有無をFACSスキャンにより検出することができる。この方法では、TSLC1モノクローナル抗体としては、配列番号1に示したTSLC1タンパク質のアミノ酸配列における232〜247番目のアミノ酸配列からなるペプチドを抗原として使用して得られたものを使用する。
また、以上のように調製したTSLC1モノクローナル抗体を用いて、診断対象の血中に存在するTSLC1タンパク質を検出することができる。この方法では、TSLC1モノクローナル抗体としては、配列番号1に示したTSLC1タンパク質のアミノ酸配列における315〜331番目のアミノ酸配列からなるペプチドを抗原として使用して得られたものを使用する。
[実施例1]
本例では、健常者と比較してATL患者においてTSLC1遺伝子が特異的に発現していることを、DNAマイクロアレイを用いた遺伝子発現解析により確認した。
上述したように分離した、患者白血病細胞検体、コントロールCD4+リンパ球検体に対してトリゾール液を用いて細胞可溶化し、RNAと、DNA・蛋白質・その他分画とに分離した。分離したRNA 1 mgを用いて、オリゴdTプライマーを用い、逆転写酵素により一本鎖cDNAを合成した。次に、合成したcDNAを鋳型として、下記のTSLC1特異的プライマーにより、TaqDNAポリメラーゼを用いてサーマルサイクラーによるDNA合成を行った。
プライマー1;ATGATCGATATCCAGAAAGACACT(配列番号3)
プライマー2;GTACTTCTAGATACCGCTGGG(配列番号4)
PCRは、94℃5分1サイクル、94℃30秒、60℃30秒、72℃1分30サイクル、72℃5分1サイクルの条件で行った。PCR産物を、2%アガロースゲル電気泳動を行い、バンドを観察した。
本例では、ノーザン・ハイブリダイゼーション法を用いて白血病細胞株におけるTSLC1遺伝子の発現様式を検討した。本例では、HTLV-1非感染T細胞白血病株(Jurkat、MOLT-4)、HTLV-1感染T細胞株(HUT-102、MT-2、OMT)及びATL細胞株(ED、KOB、SO-4、KK-1、ST-1、Su9T、S1T)の各種白血病細胞株を用いた。
可溶型TSLC及び全長型TSLC用forward;5’-TGACCAGTCAGCTGATGCTG-3’(配列番号6)
可溶型TSLC1用reverse;5’-CTTGACCAAAAGCTTTGAGAG-3’(配列番号7)
全長型TSLC1用reverse;5’-ATCGAGCCTTCTTCACCTGCT-3’(配列番号8)
PCR条件としては、可溶型TSLCについては94℃5分1サイクル、94℃30秒、63℃30秒及び72℃1分25サイクル、72℃5分1サイクルとした。全長型TSLCについては94℃5分1サイクル、94℃30秒、63℃30秒、72℃1分25サイクル、72℃5分1サイクルとした。以上の条件によりPCRを行い、2%アガロースゲル電気泳動により産物の確認を行った。
本例では、T細胞白血病細胞株におけるTSLC1遺伝子の発現とプロモーター領域のメチル化との関連性を検討した。なお、プロモーター領域のメチル化は、以下のようにして判断した。
本例では、TSLC1タンパク質による細胞接着能の亢進について検討した。先ず、以下の様にして、マウスT細胞白血病細胞株CTLL2にTSLC1遺伝子を導入した。
図7から判るように、TSLC1-GFP融合タンパク質は細胞膜に特異的に発現していた。
Claims (5)
- 細胞又は血清におけるTSLC1遺伝子の転写産物又はTSLC1タンパク質の有無を検出することができる試薬を含む、成人T細胞白血病診断薬。
- 上記試薬は、TSLC1遺伝子の全部又は一部を増幅するように設計されたプライマーを含むことを特徴とする請求項1記載の成人T細胞白血病診断薬。
- 上記試薬は、TSLC1遺伝子の全部又は一部に相補的な配列となるように設計されたプローブを含むことを特徴とする請求項1記載の成人T細胞白血病診断薬。
- 上記試薬は、白血病細胞表面抗原TSLC1を特異的に認識する抗体を含むことを特徴とする請求項1記載の成人T細胞白血病診断薬。
- 上記試薬は、可溶型TSLC1を特異的に認識する抗体を含むことを特徴とする請求項1記載の成人T細胞白血病診断薬。
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