JP7043080B2 - がんに対する有効性判定キット及びがんに対する有効性判定方法 - Google Patents
がんに対する有効性判定キット及びがんに対する有効性判定方法 Download PDFInfo
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- JP7043080B2 JP7043080B2 JP2018564453A JP2018564453A JP7043080B2 JP 7043080 B2 JP7043080 B2 JP 7043080B2 JP 2018564453 A JP2018564453 A JP 2018564453A JP 2018564453 A JP2018564453 A JP 2018564453A JP 7043080 B2 JP7043080 B2 JP 7043080B2
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Description
タンパク質アルギニンメチル基転移酵素5阻害剤のがんに対する有効性判定キットであって、
がん細胞におけるNDRG2の発現量を定量するための試薬を備え、
前記がん細胞は、成人T細胞白血病/リンパ腫、骨肉腫又は子宮がん由来の細胞である。
タンパク質アルギニンメチル基転移酵素5阻害剤のがんに対する有効性判定方法であって、
がん細胞におけるNDRG2の発現量を測定する測定ステップと、
前記測定ステップにおいて測定された発現量を、対応する正常な細胞におけるNDRG2の発現量と比較する比較ステップと、
前記比較ステップにおいて、前記がん細胞におけるNDRG2の発現量が前記正常な細胞におけるNDRG2の発現量よりも低い場合に、タンパク質アルギニンメチル基転移酵素5阻害剤が前記がん細胞に有効であると判定する判定ステップと、
を含み、
前記がん細胞は、成人T細胞白血病/リンパ腫、骨肉腫又は子宮がん由来の細胞である。
まず、実施の形態1に係る抗がん剤について説明する。本実施の形態に係る抗がん剤は、PRMT5阻害剤を含む。PRMT5阻害剤は、PRMT5を直接的又は間接的に阻害するものであれば特に限定されない。PRMT5阻害剤は、例えば、PRMT5に結合してPRMT5の活性を抑制する化合物、抗体、タンパク質、ペプチド、DNAアプタマー及びRNAアプタマー等である。PRMT5阻害剤は、PRMT5遺伝子の発現抑制を介して、PRMT5を阻害してもよい。この場合、PRMT5阻害剤は、siRNA及びアンチセンス核酸等である。
次に、実施の形態2に係る抗がん剤のスクリーニング方法について説明する。本実施の形態に係る抗がん剤のスクリーニング方法は、PRMT5阻害剤を、対応する正常な細胞よりもNDRG2の発現量が低下したがん細胞に接触させる接触ステップを含む。
続いて、実施の形態3に係るがんに対する有効性判定キットについて説明する。該有効性判定キットは、PRMT5阻害剤のがんに対する有効性判定キットであって、がん細胞におけるNDRG2の発現量を定量するための試薬を備える。
下記実施例では、細胞株として、HTLV-1非感染T細胞リンパ性急性白血病T-ALL(Jurkat及びMOLT4)、HTLV-1感染細胞株(HUT102)、ATLL細胞株(KOB)、骨肉腫細胞株(U2OS)及び子宮がん細胞株(HeLa)を用いた。IL2(50U/ml)添加若しくは無添加のfetal bovine serum(FBS)を10%添加したRPM11640又はDMEM培養液で37℃、5%二酸化炭素下で上記細胞株を培養した。
下記実施例におけるウエスタンブロット法及び免疫染色では、一次抗体として、ヤギ抗PRMT5(C-20)ポリクローナル抗体(sc-22132)、ヤギ抗NDRG2(E-20)ポリクローナル抗体(sc-sc-19468)(以上、Santa Cruz社製)、マウス抗β-actin(AC-74)モノクローナル抗体(A5316)(SIGMA ALDRICH社製)、ウサギ抗Caspase3(8G10)モノクローナル抗体(#9665)、ウサギ抗CL.-Caspase3(Asp175)ポリクローナル抗体(#9661)(以上、Cell Signaling TECHNOLOGY社製)を使用した。二次抗体としては、西洋ワサビペルオキシダーゼ(HRP)標識抗ヤギIgG抗体(P0449)、HRP標識抗マウスIgG抗体(P0260)及びHRP標識抗ウサギIgG抗体(P0399)(以上、Dako Cytomation社製)を使用した。
上述のJurkat、MOLT4、HUT102、KOB、U2OS及びHeLaにおけるNDRG2の発現量として、NDRG2タンパク質の発現量をウエスタンブロット法で確認した。ウエスタンブロット法では、培養した細胞を回収後、リン酸緩衝生理食塩水(PBS)(10mMリン酸緩衝液、120mM NaCl、2.7mM KCl、pH7.5)で洗浄した。次に、1%NP-40緩衝液(1%Nonidet P-40、50mM Tris-HCl(pH8.0)、150mM NaCl、5mM EDTA(pH8.0))を加えて細胞を溶解させた。遠心後、10~20gの細胞溶解液にSDSサンプル緩衝液(100mM Tris-HCl(pH6.8)、4%SDS、50%グリセロール、0.01%ブロモフェノールブルー、5%β-メルカプトエタノール)を加えて、95℃で5分間煮沸した。得られた試料を、8%SDS-ポリアクリルアミド電気泳動(SDS-PAGE)に供した。
図1に示すように、HTLV-1に非感染の細胞株Jurkat及びMOLT4では、NDRG2タンパク質の発現が認められた。一方、HUT102、KOB、U2OS及びHeLaでは、NDRG2タンパク質がほとんど発現していなかった。なお、Jurkat及びMOLT4におけるNDRG2のmRNAの発現量は、CD4陽性T細胞と同程度であることが上記非特許文献1において示されている。
細胞株におけるPRMT5遺伝子の発現を低下させるために、knockout(商標) RNAi system(Clontech社製)を用いて、PRMT5発現低下ベクターとしてsh-PRMT5-3及びsh-PRMT5-4を作製した。sh-PRMT5-3のセンス鎖の塩基配列及びアンチセンス鎖の塩基配列を、それぞれ配列番号1及び配列番号2に示す。sh-PRMT5-4のセンス鎖の塩基配列及びアンチセンス鎖の塩基配列を、それぞれ配列番号3及び配列番号4に示す。コントロールshRNAベクターとして、標的遺伝子の塩基配列を含まないMock又はルシフェラーゼを標的としたshlucを作製した。
図2(A)は、HUT102を親株(parental)として、親株から樹立したMock細胞株、shPRMT5-3細胞株及びshPRMT5-4細胞株の細胞増殖能の経時変化を示す。shPRMT5-3細胞株及びshPRMT5-4細胞株では、PRMT5遺伝子の発現低下により有意に細胞増殖能が低下した。図2(B)は、KOBを親株として、親株から樹立したMock細胞株、shPRMT5-3細胞株及びshPRMT5-4細胞株の細胞増殖能の経時変化を示す。HUT102と同様に、shPRMT5-3細胞株及びshPRMT5-4細胞株では、PRMT5遺伝子の発現低下により有意に細胞増殖能が低下した。
HUT102の親株、Mock細胞株、shPRMT5-3細胞株及びshPRMT5-4細胞株を回収し、それぞれ1×107個の細胞をPBSとMatrigel(BD社製)に懸濁し、26Gのシリンジを用いて免疫不全SCIDマウス(CLEA Japan社製)の背部皮下に移植した。移植後7日から腫瘍の直径及び短径を電動ノギスで随時測定し、計算式(直径×(短径)2/2)で腫瘍体積を算出した。
図6は、腫瘍体積の経時変化を示す。shPRMT5-3細胞株及びshPRMT5-4細胞株で移植後17日目以降、有意に腫瘍形成能が低下した。図7及び図8に示すように、31日目の腫瘍重量及び大きさはshPRMT5-3細胞株及びshPRMT5-4細胞株で顕著に減少していた。図9は、腫瘍免疫組織化学染色の結果を示す。shPRMT5-3細胞株及びshPRMT5-4細胞株の腫瘍では、CL.-caspase3が増加していた。
HUT102及びKOBに加え、Jurkat及びMOLT4を培養した。培養開始時に、PRMT5阻害剤であるAdOX(Sigma社製)を培地にそれぞれ付加した。上記実施例2と同様に、細胞増殖能を評価した。
図10(A)及び図10(B)は、それぞれHUT102及びKOBの細胞増殖能の経時変化を示す。AdOXは、HUT102及びKOBのいずれでも濃度依存的に細胞増殖抑制を示した。一方、図11(A)及び図11(B)は、それぞれJurkat及びMOLT4の細胞増殖能の経時変化を示す。NDRG2の発現が低下していないJurkat及びMOLT4では、AdOXによる細胞増殖抑制が認められなかった。
Claims (2)
- タンパク質アルギニンメチル基転移酵素5阻害剤のがんに対する有効性判定キットであって、
がん細胞におけるNDRG2の発現量を定量するための試薬を備え、
前記がん細胞は、成人T細胞白血病/リンパ腫、骨肉腫又は子宮がん由来の細胞である、
がんに対する有効性判定キット。 - タンパク質アルギニンメチル基転移酵素5阻害剤のがんに対する有効性判定方法であって、
がん細胞におけるNDRG2の発現量を測定する測定ステップと、
前記測定ステップにおいて測定された発現量を、対応する正常な細胞におけるNDRG2の発現量と比較する比較ステップと、
前記比較ステップにおいて、前記がん細胞におけるNDRG2の発現量が前記正常な細胞におけるNDRG2の発現量よりも低い場合に、タンパク質アルギニンメチル基転移酵素5阻害剤が前記がん細胞に有効であると判定する判定ステップと、
を含み、
前記がん細胞は、成人T細胞白血病/リンパ腫、骨肉腫又は子宮がん由来の細胞である、
がんに対する有効性判定方法。
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JP2017012654 | 2017-01-27 | ||
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PCT/JP2018/000173 WO2018139181A1 (ja) | 2017-01-27 | 2018-01-09 | 抗がん剤、抗がん剤のスクリーニング方法、がんに対する有効性判定キット及びがんに対する有効性判定方法 |
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WO2010116899A1 (ja) | 2009-04-09 | 2010-10-14 | 国立大学法人宮崎大学 | Pten のリン酸化抑制剤又は脱リン酸化剤 |
WO2016022605A1 (en) | 2014-08-04 | 2016-02-11 | Epizyme, Inc. | Prmt5 inhibitors and uses thereof |
JP2016514700A (ja) | 2013-03-15 | 2016-05-23 | オハイオ・ステイト・イノベーション・ファウンデーション | Prmt5インヒビターおよびそれらの使用方法 |
WO2016178870A1 (en) | 2015-05-04 | 2016-11-10 | Eli Lilly And Company | 5'-substituted nucleoside analogs |
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WO2010116899A1 (ja) | 2009-04-09 | 2010-10-14 | 国立大学法人宮崎大学 | Pten のリン酸化抑制剤又は脱リン酸化剤 |
JP2016514700A (ja) | 2013-03-15 | 2016-05-23 | オハイオ・ステイト・イノベーション・ファウンデーション | Prmt5インヒビターおよびそれらの使用方法 |
WO2016022605A1 (en) | 2014-08-04 | 2016-02-11 | Epizyme, Inc. | Prmt5 inhibitors and uses thereof |
WO2016178870A1 (en) | 2015-05-04 | 2016-11-10 | Eli Lilly And Company | 5'-substituted nucleoside analogs |
Non-Patent Citations (3)
Title |
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Nature Communications, 2014, Vol.5, Article No.3393, pp.1-15 |
Oncotarget, 2015, Vol.6, pp.22799-22811 |
Viruses, 2016, Vol.8, No.1, Article.7, pp.1-20 |
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JPWO2018139181A1 (ja) | 2020-01-23 |
EP3574917A1 (en) | 2019-12-04 |
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