JP5513679B2 - タンパク質フラグメントの評価によって毛髪損傷を検出し示すシステム及び方法 - Google Patents
タンパク質フラグメントの評価によって毛髪損傷を検出し示すシステム及び方法 Download PDFInfo
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- G01N33/6803—General methods of protein analysis not limited to specific proteins or families of proteins
- G01N33/6827—Total protein determination, e.g. albumin in urine
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- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
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- G01N2333/00—Assays involving biological materials from specific organisms or of a specific nature
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Description
1.毛髪を漂白し、漂白による損傷の示す標識タンパク質フラグメントを生成する。
毛髪試料は以下のプロトコルを用いて漂白した。
水酸化アンモニウム2%、EDTA四ナトリウム0.2%(酢酸でpHを10.3に調整)、及び過酸化水素6%からなる漂白液を調製した。毛房(茶色及び天然白色)を漂白液に浸し、40℃の炉内に入れた。30分後及び90分後に毛房を漂白液から取り出し、DI水道水で2分間洗い、乾燥した。
過酸化水素(H2O2)を漂白液に含まないことを除き、プロトコル1と同じ。
EDTA四ナトリウム(C10H12N2O8Na4)を漂白液に含まないことを除き、プロトコル1と同じ。
毛髪からの合計タンパク質損失を測定することにより、漂白処置の結果としての毛房の総合的なタンパク質損傷量を評価した。要約すると、各毛房からの0.2〜0.3gの毛髪を5cm(2インチ)の部分に切り分け、ガラスシンチレーションバイアルに加えた。毛髪0.1gに対してDI水1.0mLの比率でDI水を加え、ボルテックスプラットホームで2500rpmで60分間試料を物理的に攪拌した。水抽出物の合計タンパク質濃度をLowryタンパク質定量検定によって分析した。結果を表2に要約する。
漂白処理の結果として毛房が受けた特定のタンパク質損傷を、MALDI−TOF分析によって上述の水抽出物を分析して決定した。水抽出物をMALDIマトリックス溶液(80:20:0.1の比率のアセトニトリル:水:トリフルオロ酢酸溶液1mLに5mgのα−シアノ−4−ヒドロキシ桂皮酸(CHCA)を溶解したもの)と直接混合(1:1)した。それぞれ約1μLの試料をMALDIプレートに付け、MALDI−TOF/TOF 4800プラスシステム(AB−Sciex)で分析した。漂白された毛髪の水抽出物中に検出された毛髪損傷のタンパク質標識は、m/z 994/1037、1596/1639、1204、1278などのピークを含む。ピーク1038は1037の脱アミド化された形態であり、ピーク994/1037及び1596/1639などでのデルタ質量は43Daであることに留意されたい。標識1037及び1204の結果を表1にまとめた。
MALDI−TOF分析で観察された標識タンパク質の識別及び配列のために、漂白水抽出物を逆相HPLS(2mm×15cm、Jupiter、C4、300Aカラム、HP1100システム)で分離し、画分を手作業で収集し、凍結乾燥した。各画分を0.02%のトリフルオロ酢酸(TFA)水溶液に20μLに再溶解し、MALDIマトリックスと1:1で混合し、MALDIプレートに付けて、MALDIシークエンシングを行った。タンパク質の/それらの損傷標識のほかに水抽出物中のタンパク質をより完全に識別するために、漂白された毛髪の別の水抽出物を真空下で乾燥し、50mMのNH4Ac緩衝液(pH 8)に再び溶解した。トリプシン(0.25μg/μL水溶液)10μLを緩衝液に加え、37℃で4時間培養した。そのトリプシン分解物を真空下で乾燥し、0.02& TFA/水50μLに再び溶解してから、HPLC分離を行った。LC画分を収集及び乾燥し、MALDIシークエンシングにより分析した。ProteinPilotソフトウェア(AB−Sciex)を用いて、非トリプシンとトリプシンのLC画分の両方から収集されたMALDIの生データをタンパク質データベースに照合して検索した。結果は以下にまとめられる。
機械的特性の損失、形態的な損傷、及びタンパク質の損失を含む紫外線曝露による毛髪繊維の損傷を記録した。毛髪に対する紫外線損傷のペプチド標識を識別するために、紫外線によって引き起こされる特定のタンパク質の分解を以下のプロセスによって調査した。
プロトコル:Atlas Ci3000+ Xenon Arc Fade−Ometerにおいて放射照度の設定を420nmで1.48W/m2とし、チャンバ温度35℃、相対湿度80%で毛房(一般人の茶色の毛髪)を最高75時間まで紫外線に曝した。製造業者(Atlas Material Testing Technology LLC)により提供されているOutdoor to Xenon Radiant Energy Conversionプログラムを用いて行った計算によると、これらの条件下での1時間の紫外線曝露はフロリダ州で7.5時間の屋外日光曝露にほぼ相当する。
毛髪からの合計タンパク質損失を測定することにより、紫外線曝露の結果としての毛房の総合的なタンパク質損傷量を評価した。端的に述べると、各毛房からの0.2〜0.3gの毛髪を5cm(2インチ)の部分に切り分け、ガラスシンチレーションバイアルに加えた。毛髪0.1gに対してDI水1.0mLの比率でDI水を加え、ボルテックスプラットホームで2500rpmで60分間試料を物理的に攪拌した。水抽出物の合計タンパク質濃度をLowryタンパク質定量検定によって分析した。結果を表3に要約する。
紫外線曝露の結果として毛房が受けた特定のタンパク質損傷を、MALDI−TOF分析によって上述の水抽出物を分析して決定した。水抽出物をMALDIマトリックス溶液(80:20:0.1の比率のアセトニトリル:水:トリフルオロ酢酸1mLに5mgのα−シアノ−4−ヒドロキシ桂皮酸(CHCA)を溶解したもの)と直接混合(1:1)した。約1μlの各試料をMALDIプレートに付け、MALDI−TOF/TOF 4800プラスシステム(AB−Sciex)で分析した。水抽出物では、紫外線による毛髪損傷のタンパク質標識(m/z 1278)が検出された。漂白した毛髪の抽出物にもこの標識は低レベルで検出されたが、この標識は紫外線損傷後により多く、毛髪の紫外線照射後に見つかった優勢な低分子量の画分である。この標識は、消費者に関連する曝露範囲内での毛髪への紫外線曝露量に比例して増加することも見出されている(表3)。
Claims (5)
- 毛髪損傷の種類又は原因を標識タンパク質フラグメントと相関させる方法であって、
a)2つの全く同じ毛髪試料(試料A及び試料B)を生成する工程と、
b)損傷を及ぼす組成物又は処理を試料Aに適用し、損傷を及ぼす組成物又は処理を試料Bには適用しない工程と、
c)好適な溶媒試料を用いて試料A及び試料Bのそれぞれからタンパク質フラグメントを抽出する工程と、
d)MALDI−MSを用いて試料A及び試料Bからの前記タンパク質フラグメント試料を分析する工程と、
e)試料A及び試料Bからの前記MALDI−MSの結果を比較する工程と、
f)試料Bには存在せず試料Aに存在する特有の修飾パターンを識別することによって前記標識タンパク質フラグメントを識別する工程と
を含む、方法。 - 酵素によるタンパク質分解の後に前記MALDI−MSを行う、請求項1に記載の方法。
- 前記酵素によるタンパク質分解をせずに前記MALDI−MSを行う、請求項1に記載の方法。
- 毛髪損傷の種類又は原因を示す方法であって、
a)好適な溶媒を用いて毛髪試料からタンパク質フラグメントを抽出する工程と、
b)MALDI−MSによって前記タンパク質フラグメント試料を分析し、タンパク質フラグメントの結果を得る工程と、
c)前記タンパク質フラグメントの結果を特定の損傷の標識タンパク質フラグメントのリストと比較することによって毛髪損傷を識別する工程と
を含む、方法。
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