JP6061448B2 - 被験物質の評価方法 - Google Patents
被験物質の評価方法 Download PDFInfo
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- JP6061448B2 JP6061448B2 JP2011053275A JP2011053275A JP6061448B2 JP 6061448 B2 JP6061448 B2 JP 6061448B2 JP 2011053275 A JP2011053275 A JP 2011053275A JP 2011053275 A JP2011053275 A JP 2011053275A JP 6061448 B2 JP6061448 B2 JP 6061448B2
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Landscapes
- Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)
Description
(1) 香料および/または香油と被験物質とをTRPA1発現細胞に接触させ、前記香料および/または香油によりTRPA1を介して引き起こされる生理学的事象を測定し、前記生理学的事象に基づき、前記被験物質が香料および/または香油による刺激を抑制する物質であるかどうかを評価する被験物質の評価方法、
(2) 前記生理学的事象が、前記香料および/または香油の存在下における前記被験物質との接触前後の細胞内カルシウムイオン濃度の変化である前記(1)に記載の評価方法、
(3) 前記香料が、カルボン、メントン、シトロネラール、シトラール、リナロール、テルピネオールおよびオイゲノールからなる群より選ばれた少なくとも1種である前記(1)または(2)に記載の評価方法、ならびに
(4) 前記香油が、スペアミント油、タイム油、チョウジ油、ラベンダー油、セージ油およびローマカミツレ油からなる群より選ばれた少なくとも1種である前記(1)または(2)に記載の評価方法
に関する。
(a)配列番号:1に示される塩基配列に対して、BLASTアルゴリズムにより、Cost to open gap 11、Cost to extend gap 1、expect value 10、wordsize 11の条件でアライメントして算出される配列相同性の値が、TRPA1の生理学的機能を十分に発揮させる観点から、好ましくは60%以上、より好ましくは80%以上、さらに好ましくは90%以上である塩基配列からなり、かつコードされるポリペプチドが少なくとも前記生理学的機能を発現するポリペプチドである核酸、
(b)配列番号:2において、1個または数個のアミノ酸残基の置換、欠失または付加を有するアミノ酸配列をコードし、コードされるポリペプチドが少なくとも前記生理学的機能を発現するポリペプチドである核酸、
(c)ストリンジェントな条件下で、配列番号:1に示される塩基配列からなる核酸に対する相補鎖核酸とハイブリダイズし、コードされるポリペプチドが、前記生理学的機能を発現するポリペプチドである核酸
などが挙げられる。
に基づいて求めることができる。なお、本明細書において、「蛍光強度340nm」はTRPA1発現細胞に導入され、かつ細胞内のカルシウムイオンに結合したFURA 2−AMに基づく励起波長340nmにおける蛍光の強度を示し、「蛍光強度380nm」はTRPA1発現細胞に導入されたFURA 2−AMに基づく励起波長380nmにおける蛍光の強度を示す。
ヒトTRPA1をコードするcDNA〔配列番号:1(GenBankアクセッション番号:NM_007332)に示される塩基配列の63位〜3888位のポリヌクレオチド〕を、哺乳動物細胞用ベクター〔インビトロジェン社製、商品名:pcDNA3.1(+)〕のクローニングサイトに挿入し、ヒトTRPA1発現ベクターを得た。得られたヒトTRPA1発現ベクター1μgと、遺伝子導入用試薬〔インビトロジェン社製、商品名:PLUS Reagent(プラスリージェント)、カタログ番号:11514−015〕6μlとを混合し、混合物Iを得た。また、遺伝子導入用カチオン性脂質〔インビトロジェン社製、商品名:リポフェクタミン(登録商標)、カタログ番号:18324−012〕4μlと、血清使用量低減培地〔インビトロジェン社製、商品名:OPTI−MEM(登録商標)I Reduced−Serum Medium(カタログ番号:11058021)200μlとを混合し、混合物IIを得た。
製造例1で得られたTRPA1発現細胞を、細胞内カルシウムイオン測定用試薬であるFURA 2−AM(インビトロジェン社製)を最終濃度5μMで含む10質量%ウシ胎仔血清含有DMEM培地中、室温で60分間インキュベーションすることにより、前記TRPA1発現細胞にFURA 2−AMを導入し、FURA 2−AM導入細胞を得た。
試験例1において、1mMメントールを含有する溶媒Aの代わりに被験物質を含有する被験試料を用いたことを除き、試験例1と同様に操作を行ない、蛍光強度340nmおよび蛍光強度380nmを測定した。なお、被験物質として香料であるカルボン、メントン、シトロネラール、シトラール、リナロール、テルピネオールまたはオイゲノールを用いた。被験試料は、1mMカルボンを含有する溶媒A、1mMメントンを含有する溶媒A、1mMシトロネラールを含有する溶媒A、1mMシトラールを含有する溶媒A、1mMリナロールを含有する溶媒A、1mMテルピネオールを含有する溶媒Aまたは1mMオイゲノールを含有する溶媒Aである。
試験例2において、被験物質として香油であるスペアミント油、タイム油、クローブ油、ラベンダー油、セージ油またはローマカミツレ油を用いたことを除き、試験例2と同様に操作を行ない、TRPA1発現細胞におけるΔ蛍光強度比a/Δ蛍光強度比bを算出した。なお、被験試料は、0.01体積%スペアミント油を含有する溶媒A(試料番号1)、0.01体積%タイム油を含有する溶媒A(試料番号2)、0.01体積%クローブ油を含有する溶媒A(試料番号3)、0.01体積%ラベンダー油を含有する溶媒A(試料番号4)、0.01体積%セージ油を含有する溶媒A(試料番号5)または0.01体積%ローマカミツレ油を含有する溶媒A(試料番号6)である。
試験例1において、被験試料の代わりに1mMシトラールを含有する溶媒Aと被験物質との混合物を用いたことを除き、試験例2と同様に操作を行ない、蛍光強度340nmおよび蛍光強度380nmを測定した。被験物質としてルテニウムレッド〔シグマ アルドリッチ ジャパン(株)製、カンファー〔シグマ アルドリッチ ジャパン(株)製〕、グリセロールまたは1,3−ブチレングリコールを用いた。各混合物中における被験物質の濃度は、それぞれ、ルテニウムレッドが10μM、カンファーが5mM、グリセロールが1mM、1,3−ブチレングリコールが1mMである。前記ルテニウムレッドは、TRPチャネルに対する既知のアンタゴニストである。また、カンファーは、TRPA1に対してブロッカーとして作用する。なお、1mMシトラールを含有する溶媒Aと被験物質との混合物の代わりに対照である溶媒Aを用いたことを除き、前記と同様に操作を行ない、蛍光強度340nmおよび蛍光強度380nmを測定した。測定された蛍光強度340nmおよび蛍光強度380nmから、式(I)にしたがってΔ蛍光強度比Aを算出した。
実施例1において、1mMシトラールを含有する溶媒Aの代わりに0.01体積%タイム油を含有する溶媒Aを用いたことを除き、実施例1と同様に操作を行ない、Δ蛍光強度比AおよびΔ蛍光強度比Bを算出した。
Claims (2)
- 被験物質が香料および/または香油により皮膚に与えられる不快な刺激を抑制する物質であるかどうかを評価する方法であって、メントン、シトロネラールおよびテルピネオールからなる群より選ばれた少なくとも1種の香料および/またはラベンダー油、セージ油およびローマカミツレ油からなる群より選ばれた少なくとも1種の香油と被験物質とをTRPA1発現細胞に接触させ、前記被験物質によりTRPA1を介して引き起こされる生理学的事象を測定し、前記生理学的事象に基づき、前記被験物質が前記香料および/または前記香油により皮膚に与えられる不快な刺激を抑制する物質であるかどうかを評価する被験物質の評価方法。
- 前記生理学的事象が、前記香料および/または香油の存在下における前記被験物質との接触前後の細胞内カルシウムイオン濃度の変化である請求項1に記載の評価方法。
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