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JP2008133287A - Psca:前立腺幹細胞抗原 - Google Patents

Psca:前立腺幹細胞抗原 Download PDF

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JP2008133287A
JP2008133287A JP2007328082A JP2007328082A JP2008133287A JP 2008133287 A JP2008133287 A JP 2008133287A JP 2007328082 A JP2007328082 A JP 2007328082A JP 2007328082 A JP2007328082 A JP 2007328082A JP 2008133287 A JP2008133287 A JP 2008133287A
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Robert Reiter
レイター ロバート
Owen Witte
ウィッテ オーウェン
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Abstract

【課題】血清PSAレベルは、更に病期判定の目的で利用することもできるが、PSA単独では、前立腺腫瘍を信頼性をもって病期を判定することはできないことなどに鑑みて、前立腺癌の管理において、より信頼でき、かつ情報の多い病期判定および予後判定の方法などを提供すること。
【解決手段】前立腺幹細胞抗原(PSCA)と称する、新規の前立腺に特異的な細胞表面抗原であって、高度の前立腺上皮内新生腫瘍(PIN)、アンドロゲン依存型およびアンドロゲン非依存型前立腺腫瘍を含む、前立腺癌の全ての病期を通じて広く過剰発現する抗原など。
【選択図】なし

Description

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図1Aは、ヒトPSCA(ATCC寄託番号209612)をコードするcDNAのヌクレオチド配列(A)および翻訳されたアミノ酸配列(B)である。 図1Bは、ヒトPSCA(ATCC寄託番号209612)をコードするcDNAのヌクレオチド配列(A)および翻訳されたアミノ酸配列(B)である。 図2は、マウスのPSCA相同体をコードするcDNAのヌクレオチド配列である。 図3は、ヒトPSCA、マウスPSCAおよびヒト幹細胞抗原−2(hSCA−2)のアミノ酸配列を並べたものである。斜線の領域は、保存されたアミノ酸を 強調している。保存されたシステインは、太字で示した。PSCA中の4個の予想されたN−グリコシル化部位は、アスタリクスで示した。このタンパク質の最 初および最後の下線を付けたアミノ酸は各々、N−末端の疎水性シグナル配列およびC−末端のGPI−アンカー配列を表わしている。 図4は、ヒトPSCAの疎水性のプロットである。 図5は、ヒトPSCAのChou−Fasman分析である。 図6は、様々な前立腺癌細胞株および異種移植片におけるPSCA発現のRT−PCR分析である。 図7は、正常および癌性の組織におけるPSCA mRNAの制限された発現である。A:正常ヒト組織におけるPSCA発現のRT−PCR分析は、前立腺、胎盤および扁桃腺において高い発現を示している。 示された組織由来の逆転写された第一のcDNA鎖(Clontech,Palo Alto,CA)1ngを、PSCA遺伝子に特異的なプライマーで増幅した。データは、30サイクルの増幅を示している。B:PSCA発現のRT−PCR分析は、前立腺癌異種移植片および正常組織において高レベルを示している。示された組織由来の逆 転写cDNA5ngは、PSCA遺伝子に特異的なプライマーで増幅した。β−アクチン遺伝子に特異的なプライマーによる増幅は、様々な試料のcDNA第一 鎖が正常であることを示している。データは、25サイクルの増幅を示している。AD、アンドロゲン依存型;AI、アンドロゲン非依存型;IT、脛骨内異種 移植片;C.L.、細胞株。 図8は、ヒトPSCA、マウスのPSCAおよびヒトThy−1/Ly−6遺伝子構造の概略図である。 図9は、PSCA発現のノーザンブロット分析である。A:正常な前立腺およびLAPC−4アンドロゲン依存型(AD)および非依存型(AI)の前立腺癌異 種移植片由来のRNA全体は、PSCAまたはPSAに特異的なプローブを用いて分析した。同等のRNAの負荷およびRNAの完全性を、18Sおよび28S RNAのエチジウム染色により個別に示した。B:ヒトの複数の組織のPSCAノーザンブロット分析。フィルターは、Clontech(Palo Alto,CA)から入手し、各列はポリA RNAを2μg含有する。 図10は、前立腺癌異種移植片および腫瘍細胞株におけるPSCA、PSMA、およびPSAの発現のノーザンブロットでの比較である。PSCAおよび PSMAは高レベルの前立腺癌に特異的な遺伝子発現を示した。示された組織由来の総RNA 10μgを、アガロース/ホルムアルデヒドゲル上でサイズ分画してニトロセルロースに転写し、かつ32Pで標識したプローブと順次ハイブリダイゼーションし、PSCA、PSMA、およびPSAのcDNA断片を示した。4時間および72時間後の膜のオートラジオグラフィー暴露を示し、かつ臭化エチジウムゲルは、試料が等量負荷されたことを示している。BPH、良性前立腺肥大症;AD、アンドロゲン依存型;AI、アンドロゲン非依存型;IT、脛骨内異種移植片;C.L.、細胞株。 図11は、正常および悪性前立腺標本上のヒトPSCAのアンチセンスリボプローブによるインサイチューハイブリダイゼーションである。A:PSCAは、基 底細胞上皮内の基底細胞サブセットによって発現される(黒色矢印)が、前立腺管の内壁(lining)の最終分化した分泌細胞によっては発現されない(× 400倍)。B:倍率×40で、PSCAは、高度の前立腺上皮内新生腫瘍(PIN)(黒色矢印)および侵襲性前立腺癌腺(黄色矢印)によって強力に発現さ れるが、正常な上皮においては検出されない(緑色矢印)。C:高度の癌腫におけるPSCAの強力な発現(×200倍)。 図12は、PSCAの生化学的分析である。A:PSCAは、「材料および方法」に示したよ うに、PSCA構築物で一過性にトランスフェクションした293T細胞から免疫沈降し、その後N−グリコシダーゼFまたはO−グリコシダーゼのいずれかに より消化した。B:PSCAは、トランスフェクションした293T細胞から、更にこれらの細胞の馴化培地(conditioned media)から免疫沈降した。15%ポリアクリルアミドゲル上で、細胞に結合したPSCAは、分泌されたPSCAよりも大きく移動した。C:親和性精製 したポリクローナル抗PSCA抗体を用いる、模擬(mock)トランスフェクションした293T細胞、PSCAトランスフェクションした293T細胞およ びLAPC−4前立腺癌異種移植片細胞のFACS分析である。細胞は、表面の発現のみを検出するために透過させ(permeabilize)なかった。y 軸は、相対的細胞数を表わし、X軸は対数スケールでの蛍光染色強度を表わしている。 図13は、ビオチン標識したPSCAプローブの、フィトヘムアグルチニン(phytohemagglutinin)で刺激した末梢血リンパ球由来のヒト中 期細胞への、インサイチューハイブリダイゼーションである。第8相同染色体を矢印で示し;特異的標識が8q24.2に認められた。挿入図は、8q24.2 に(矢印の先)に特異的標識を示す2個の第8相同染色体の部分的核型を示している。画像は、冷却した電荷結合素子(CCD)カメラを装着したZeiss Axiopot顕微鏡を用いて得た。DAPIで染色された染色体およびハイブリダイゼーションシグナルの個別の画像は、画像解析ソフト(NU200およびImage 1.57)を用いて合体した。 図14は、抗−PSCAモノクローナル抗体1G8(緑)および3E6(赤)、マウスの抗−PSCAポリクローナル血清(青)、または対照の第二抗体(黒) を用いる、前立腺癌異種移植片(LAPC−9)、前立腺癌細胞株(LAPC−4)および正常な前立腺上皮細胞(PREC)上の、細胞表面PSCA発現のフ ローサイトメトリー分析である。詳細は実施例5を参照のこと。 図15は、抗−PSCAモノクローナル抗体1G8および3E6のエピトープマッピングである。詳細は実施例5を参照のこと。

Claims (1)

  1. 本願明細書等に記載されるような、抗原。
JP2007328082A 1997-03-10 2007-12-19 Psca:前立腺幹細胞抗原 Expired - Lifetime JP4615007B2 (ja)

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