JP5926279B2 - Dpp−4阻害剤 - Google Patents
Dpp−4阻害剤 Download PDFInfo
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- JP5926279B2 JP5926279B2 JP2013541862A JP2013541862A JP5926279B2 JP 5926279 B2 JP5926279 B2 JP 5926279B2 JP 2013541862 A JP2013541862 A JP 2013541862A JP 2013541862 A JP2013541862 A JP 2013541862A JP 5926279 B2 JP5926279 B2 JP 5926279B2
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Description
コラーゲンに由来する、式(1):Xe−Pro/Ala/Hyp−Xa−Xb−Xc−Xd(式中、Xeは、等電点5.9〜6.3のアミノ酸残基であり、Pro/Ala/Hypは、Pro、AlaまたはHypを示し、XaはHyp、ProおよびArg以外のアミノ酸残基または欠失であり、XbはGly、Proまたは欠失であり、XcはPro、Alaまた欠失、Xdはアミノ酸残基または欠失である。)で示されるペプチドを有効成分とするDPP−4阻害剤であって、
前記ペプチドが、
式(B−1):Leu−Pro−Xa−Xb−Xc(式中、XaはGlyであり、XbはProまたは欠失、XcはAlaまたは欠失である。)、
式(B−2):Leu/Ile−Hyp−Xa−Xb−Xc(式中、Leu/IleはLeuまたはIleを示し、XaはGly、XbはProまたは欠失、XcはAlaまたは欠失である。)、
式(A−1):Gly−Pro−Xa−Xb−Xc−Xd(式中、XaはHypおよびVal以外の等電点が3.0〜6.2のアミノ酸残基、XbはGly、XcはProまたは欠失、XdはAla以外のアミノ酸残基または欠失である。)、
式(A−2):Gly−Ala−Xa−Xb−Xc−Xd(式中、Xaは等電点が5.8〜6.2のアミノ酸残基または欠失であり、XbはGlyまたは欠失、XcはProまたは欠失、Xdはアミノ酸残基または欠失である。)で示されるペプチドのいずれかであることを特徴とする、DPP−4阻害剤を提供するものである。
Leu−Pro−Gly、
Leu−Pro−Gly−Pro−Ala、
Ile−Hyp−Gly、
Leu−Hyp−Gly−Pro−Ala、
Gly−Pro−Ala−Gly、
Gly−Pro−Ala−Gly−Pro、
Gly−Pro−Ala−Gly−Pro−Arg、
Gly−Pro−Ala−Gly−Pro−Hyp、
Gly−Pro−Ala−Gly−Pro−Ile、
Gly−Pro−Leu−Gly−Pro−Val、
Gly−Pro−Ile−Gly−Pro−Val、
Gly−Ala−Ile−Gly−Pro−Ala、
Gly−Ala−Ile−Gly−Pro−Ser、
Gly−Ala−Val−Gly−Pro−Ala、
Gly−Ala−Val−Gly−Pro、
およびGly−Alaからなる群から選択されるいずれか1種以上である、上記DPP−4阻害剤を提供するものである。
(1)DPP−4阻害率の測定方法
50mMのトリス−塩酸バッファー(pH7.5)1mlに試料1mgを溶解したサンプル液35μlと、50mMのトリス−塩酸バッファー(pH7.5)に溶解したDPP−4(シグマ社製、豚腎臓由来;8.6mU/ml)15μlとをマイクロプレートウェル(NUNC社製、商品名「237015」)中で混合し37℃、10分間インキュベートした。
これに、予め37℃に保温しておいた基質溶液(グリシルPro−4−メチルクマリン−7−アミド(Gly−Pro−MCA)を10μMとなるよう50mMトリス−塩酸バッファー(pH7.5)に溶解したもの)50μlを添加および混合し、37℃で20分間反応させた。
DPP−4によって遊離される7−アミノ−4−メチルクマリン(AMC)の蛍光強度をマイクロプレートリーダー型蛍光検出器(コロナ電器社製、商品名「SH−9000」)で経時的に測定した。なお、測定波長は励起波長380nm、測定波長460nmで行った。なお、サンプルに代えて50mMのトリス−塩酸バッファー(pH7.5)を同量使用したものを対照として蛍光強度を測定した。
DPP−4の活性は、反応時間中における蛍光強度変化量の平均勾配で表し、DPP−4阻害率は、対照を100%とし、サンプルの活性を前記対照から差し引いた分を阻害率(%)として算出した。
上記したDPP−4阻害率の測定方法に準じて、サンプル濃度を0.001〜7.2μmol/mlの間で変化させて阻害率を得て、DPP−4活性の50%阻害濃度(IC50値)を算出した。
表1に示すGly−Pro−Ala−Gly−Proを、アプライドバイオシステムズ社製のペプチド自動合成装置(433A)を用いたFmoc固相合成法にて合成した。
合成は、オリゴペプチドのC−末端にあたるアミノ酸を樹脂に担時させ、N−末端を1アミノ酸ずつ伸長させていくステップワイズエロンゲーション法にて行い、伸長反応にあたるペプチドカップリング反応は、ジイソプロピルカルボジイミド(DIC)と1−ヒドロキシベンゾトリアゾール(HOBt)を縮合剤として用いた。なお、伸長させていくN−末端アミノ酸のアミノ基は、9−フルオレニルメチルオキシカルボニル(Fmoc)にて保護したが、オリゴペプチドの構成アミノ酸には反応活性のある側鎖が含まれていないため、特に側鎖の保護は行わないこととした。
まず、オリゴペプチドのC−末端にあたるProのN−末端をFmocで保護し、C−末端を樹脂に担持させたFmoc−Pro−Wang樹脂(0.5−0.8mmol/g、Bachem社製)0.5gを樹脂に担持させた。これをペプチド自動合成装置の反応容器に入れ、20%ピペリジン−DMF溶液でFmocの脱保護を10分間行った。DMFで樹脂を1分間洗浄後、Fmoc−Gly−OH、DICおよびHOBtをそれぞれ1mmolずつ反応溶液に加えた。1時間反応後、未反応のN−末端が検出されない事を確認し、DMFで1分間洗浄した。更に20%ピペリジン−DMFでFmocの脱保護を行い、DMFで樹脂を洗浄後、Fmoc−Ala−OH、DICおよびHOBtをそれぞれ1mmol加え反応を行った。以下同様の方法でPro、Glyについても上記操作を行い、アミノ酸を一つずつ伸長させた。得られたFmoc−Gly−Pro−Ala−Gly−Pro−Wang樹脂を20%ピペリジン−DMF溶液で10分間脱保護後、減圧乾燥を行った。得られた乾燥樹脂をTFA(10mL×3回)で処理し、樹脂からオリゴペプチド粗生成物をTFAに溶出させた。
得られたTFA溶液は室温にて減圧留去後、残渣に氷冷下ジエチルエーテル10mLを加え沈殿物を得た。沈殿物は更にジエチルエーテル(10mL×5回)で洗浄し、沈殿物を減圧乾燥させた。このとき得られた粗生成物の重量は38.5mg(収率29.8%)であった。得られた粗生成物は精製水に溶解し、逆相高速液体クロマトグラフィー(HPLC)にて分取し精製した。得られた精製物は薄層クロマトグラフィー(TLC)、HPLCにて純度を確認後、エドマン法にてアミノ酸配列を決定し、質量分析装置(MALDI−TOF)にて目的の分子量であることを確認した。
最終的な目的物の重量は30.7mgで収率は23.8%であった。
得られたペプチドを用いてDPP−4阻害率およびIC50値を測定した。結果を表1に示す。
オリゴペプチドのC−末端アミノ酸としてFmoc−Arg(Pbf)−Wang樹脂、Fmoc−Hyp−Wang樹脂、Fmoc−Ile−Wang樹脂、Fmoc−Val−Wang樹脂、Fmoc−Gln−Wang、Fmoc−Pro−Wang樹脂を使用し、Fmoc基保護アミノ酸として、Fmoc−Gly−OH、Fmoc−Pro−OH、Fmoc−Leu−OH、Fmoc−Ile−OHを使用し、実施例1に準じて表1に示す、Gly−Pro−Ala−Gly−Pro−Arg(実施例2)、Gly−Pro−Ala−Gly−Pro−Hyp(実施例3)、Gly−Pro−Ala−Gly−Pro−Ile(実施例4)、Gly−Pro−Leu−Gly−Pro−Val(実施例5)、Gly−Pro−Ile−Gly−Pro−Val(実施例6)、Gly−Pro−Val(実施例7)、Gly−Pro−Gln(実施例8)、Gly−Pro−Ala−Gly(実施例9)を合成した。
Fmoc基でアミノ基を保護したアミノ酸を使用し、実施例1に準拠して、表1に示す実施例10〜15のペプチドを合成しDPP−4阻害曲線を作成した。結果を表1に示す。なお、実施例10のペプチドの合成は、実施例1と相違して、2つのカルボキシル基を含むGluを使用するため、Glu側鎖のカルボキシル基をtertiary−ブチル基(But基)で保護したFmoc−Glu(OBut)−Wang樹脂を使用し、最後にTFAにてBut基の除去を行った。
Fmoc基でアミノ基を保護したアミノ酸を使用し、実施例1に準じて、表1に示す比較例1〜比較例3のペプチドを合成した。得られたペプチドを用いてDPP−4阻害率およびIC50値を測定した。結果を表1に示す。なお、比較例1〜比較例3のペプチドは、いずれも配列番号14のアミノ酸配列の一部を構成するペプチドである。
なお、本願では、上記測定法に基づくDPP−4阻害率が30%以下、またはIC50が10μmol/ml以上のいずれかを満たすものを比較例とした。
表1の実施例1〜6、9、12〜15に示すように、N末端がGlyであり、N末端から2番目のアミノ酸残基がProまたはAlaのアミノ酸数4〜6のペプチドは、N末端が4番目のアミノ酸残基がGlyであると、N末端から3番目のアミノ酸の種類を問わず、いずれもDPP−4阻害活性に優れた。特に、実施例1〜4、および実施例9に示すように、Gly−Pro−Ala−Glyの配列を有するペプチドは、ペプチド長が長くなるに従いDPP−4阻害活性が増加した。
表1の比較例1〜比較例3と実施例7、8、10および11とを比較して明らかなように、ジペプチドまたはトリペプチドの場合、N末端から2番目がProやAlaであっても3番目がHypであるとDPP−4阻害活性が極めて低いかDPP−4阻害活性は存在しなかった。
Fmoc基でアミノ基を保護したアミノ酸を使用し、実施例1に準拠して、表2に示すペプチドを合成した。また、実施例17で合成したペプチド(Leu−Pro−Gly)のDPP−4阻害曲線を作成した。この阻害曲線を図2に示す。
Fmoc基でアミノ基を保護したアミノ酸を使用し、実施例1に準じて、表2に示す比較例4から比較例7のペプチドを合成した。得られたペプチドを用いてDPP−4阻害率およびIC50値を測定した。結果を表2に示す。なお、比較例4から比較例7のペプチドは、いずれも配列番号14のアミノ酸配列の一部を構成するペプチドである。
表2の実施例16〜実施例25から、N末端から2番目のアミノ酸残基がHypであっても、DPP−4阻害活性が発揮されることが判明した。一方、実施例20と比較例4〜7とを比較して明らかなように、N末端から2番目のアミノ酸残基がProまたはHypであるジペプチドは、N末端のアミノ酸残基の種類によってDPP−4阻害活性が大きく異なる傾向があり、Phe、Proの場合にはDPP−4阻害活性は全く存在しない。
実施例25と比較例6とを比較すると、Ala−HypのジペプチドにN末端から3番目のアミノ酸残基としてGlyが結合するとDPP−4阻害活性が発揮される。この傾向は、実施例21から実施例25に示すように、N末端のアミノ酸残基に限定されずに観察された。更に、実施例16〜実施例18に示すように、N末端から2番目のアミノ酸残基がProの場合も3番目にGlyが結合するとDPP−4阻害活性が増し、ペプチド長が長くなると更にDPP−4阻害活性が増強される傾向が観察された。
Claims (1)
- Leu−Pro−Gly、
Leu−Pro−Gly−Pro−Ala、
Ile−Hyp−Gly、
Leu−Hyp−Gly−Pro−Ala、
Gly−Pro−Ala−Gly、
Gly−Pro−Ala−Gly−Pro、
Gly−Pro−Ala−Gly−Pro−Arg、
Gly−Pro−Ala−Gly−Pro−Hyp、
Gly−Pro−Ala−Gly−Pro−Ile、
Gly−Pro−Leu−Gly−Pro−Val、
Gly−Pro−Ile−Gly−Pro−Val、
Gly−Ala−Ile−Gly−Pro−Ala、
Gly−Ala−Ile−Gly−Pro−Ser、
Gly−Ala−Val−Gly−Pro−Ala、
Gly−Ala−Val−Gly−Pro、
およびGly−Alaからなる群から選択されるいずれか1種以上のペプチドを有効成分とするDPP−4阻害剤。
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CN106831980A (zh) | 2017-06-13 |
CN106243216B (zh) | 2019-12-20 |
HK1200840A1 (en) | 2015-08-14 |
US9340579B2 (en) | 2016-05-17 |
CN106831980B (zh) | 2020-09-15 |
CA2854289C (en) | 2019-11-12 |
US20140309401A1 (en) | 2014-10-16 |
CN106866814B (zh) | 2020-06-23 |
JPWO2013065832A1 (ja) | 2015-04-02 |
WO2013065832A1 (ja) | 2013-05-10 |
CN106243216A (zh) | 2016-12-21 |
CN106866814A (zh) | 2017-06-20 |
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