JP2015500484A - 全身骨格筋量の定量方法 - Google Patents
全身骨格筋量の定量方法 Download PDFInfo
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Abstract
Description
(a)10〜200mgのD3−クレアチン、その塩、またはこれらの水和物を上記被検体に経口投与するステップと、
(b)上記D3−クレアチンの投与後、少なくとも12時間経過させるステップと、
(c)上記被検体から生体試料を取得するステップと、
(d)上記生体試料中のクレアチニン濃度およびD3−クレアチニン濃度を定量するステップと、
(e)上記被検体の全身骨格筋量を計算するために、定量した上記クレアチニン濃度およびD3クレアチニン濃度を用いるステップとを含んでいる。
(a)上記被検体から生体試料を取得するステップと、
(b)上記生体試料を分析して、上記生体試料のクレアチニンM+2同位体ピークのピーク面積を求めるステップと、
(c)(b)で求めたピーク面積と、D3−クレアチニンを用いて作成した検量線とを比較して、上記生体試料中のクレアチニンM+2同位体濃度を定量するステップと、
(d)(c)で取得した濃度を、生体試料中のクレアチニンM+0濃度に対するクレアチニンM+2濃度の比である希釈係数で割るステップとを含んでいる。
(a)10〜200mgのD3−クレアチン、その塩、またはこれらの水和物を上記被検体に経口投与するステップと、
(b)上記D3−クレアチンの投与後、少なくとも12時間経過させるステップと、
(c)上記被検体から尿試料を取得するステップと、
(d)上記尿試料中のクレアチニン濃度およびD3−クレアチニン濃度を定量するステップと、
(e)上記被検体の全身骨格筋量を算出するために、定量した上記クレアチニン濃度およびD3クレアチニン濃度を用いるステップとを含んでいる。
(a)上記被検体から生体試料を取得するステップと、
(b)上記生体試料を分析して、上記生体試料のクレアチニンM+2同位体ピークのピーク面積を求めるステップと、
(c)(b)で求めた上記ピーク面積と、D3−クレアチニンを用いて作成した検量線とを比較して、上記生体試料中のクレアチニンM+2同位体濃度を定量するステップと、
(d)(c)で取得した濃度を、生体試料中のクレアチニンM+0濃度に対するクレアチニンM+2濃度の比である希釈係数で割るステップとを含んでいる。
D3−クレアチントレーサー希釈法を用いた前臨床モデルの全身骨格筋量の定量
ラット1匹あたり0.475mgのD3−クレアチンを投与し、尿への流出最小限に止めて、D3−クレアチンが直ちに完全に吸収されて全身に循環するようにし、99%以上のD3−クレアチントレーサーを、体内のクレアチン貯蔵量と平衡になるようにした。
ヒト被検者に、30、60または100mgのD3−クレアチン一水和物を単回経口投与する。その後、D3クレアチン一水和物の投与から1、2、3、4、5または6日後に尿試料を採取する。
式中、tは、定常状態の間の尿の採取間隔である。
クレアチン貯蔵量は、総尿クレアチニン(モル/日)をK(1/日)で割ることによって概算することもできる。
D3−クレアチン一水和物およびD3クレアチニンの参照標準物質をC/D/N Isotopes, Montreal Canadaから購入した。
D3−クレアチンの分離をZorbax Hilic Plusのシリカ分析カラム(50×2.1mm,Rapid Resolution HD 1.8μ,Agilent Corp., Santa Clara CA.)を備えたAcquity UPLC(Waters Corp., Milford, Ma.)を用いて実施した。注入量は概して8μLである。
化学薬品および試薬:Sigma Aldrich(St.Louis,Mo.)から購入したアセトニトリルおよび水(すべてHPLCグレードまたはそれ以上)。Sigma Aldrich(St.Louis,Mo.)から購入したギ酸アンモニウム。CDN Isotopes, Montreal Canadaから購入したd3−クレアチン(一水和物)およびd3−クレアチニンの参照標準。
上記内部標準として機能するアセトニトリル溶液(500ng/mL)を200μLの分取し、アセトニトリルを加えるダブルブランクサンプル以外の各ウェルに加えた。試料、検量線用標準試料、またはQC試料を40μL分取し、SILを含有するプレート内の適切なウェルに移す。上記プレートを密封し、約3分間撹拌混合した。上記プレートを約3000gで5分間遠心分離する。上清を未使用の96ウェルプレートに移し、その後HPLC−MS/MSシステムに注入して分析する。別々のヒトの尿試料からのD3−クレアチンおよびd3−クレアチニンを分析する。
d3−クレアチン、d3−クレアチニンおよびクレアチニンの分離を、Agilent Zorbax Hilic Plusのシリカ分析カラム(寸法:50×2.1mm,Rapid Resolution HD 1.8μ,Agilent Corp., Santa Clara CA.)を備えたAcquity UPLC(Waters Corp., Milford, Ma.)を用いて実施する。注入量は概して2μLである。
LC/MS/MSを用いてバイオマーカーの生体分析定量を行うために、代替マトリックスまたは代替分析物を用いる必要がある。このアッセイでは、d3−クレアチニンが内因的に検出されないのでヒトの尿を使用することができ、d3―クレアチニン検量線からクレアチニンの定量を行うことができる。d3−クレアチニンおよびクレアチニンの等価性が示された。
クレアチニンを定量するための代替分析物としてd3クレアチニンが利用可能であること、および116/44(M+2)のMRMトランジションを同位体比の補正係数とともに利用可能であることを立証するために多くの実験が行われた。
この方法は、d3クレアチンの投与によって変換されたヒトの尿中のd3クレアチニン量を定量するために用いられる。さらに、内因性クレアチニン量はd3クレアチニン検量線を用いて定量される。
Claims (13)
- 被検体の生体試料中のクレアチニン濃度の定量方法であって、上記方法は、
(a)上記被検体から生体試料を取得するステップと、
(b)上記生体試料を分析して、上記生体試料のクレアチニンM+2同位体ピークのピーク面積を求めるステップと、
(c)(b)で求めたピーク面積と、D3−クレアチニンを用いて作成した検量線とを比較して、上記生体試料中のクレアチニンM+2同位体の濃度を定量するステップと、
(d)(c)で取得した濃度を、生体試料中のクレアチニンM+0濃度に対するクレアチニンM+2の濃度の比である希釈係数で割るステップとを含むことを特徴とする方法。 - 上記生体試料が、尿試料であることを特徴とする請求項1に記載の方法。
- 上記生体試料が、血液試料であることを特徴とする請求項1に記載の方法。
- 上記被検体が、ヒトであることを特徴とする請求項1〜3のいずれか1項に記載の方法。
- 上記クレアチニンM+2同位体ピークのピーク面積が、液体クロマトグラフィー/質量分析(LC/MS/MS)を用いて求められることを特徴とする請求項1〜4のいずれか1項に記載の方法。
- 上記希釈係数が、0.0002142±0.0000214であることを特徴とする請求項1〜5のいずれか1項に記載の方法。
- 上記希釈係数が、0.0002142±0.00001であることを特徴とする請求項1〜6のいずれか1項に記載の方法。
- 上記希釈係数が、0.0002142±0.000005であることを特徴とする請求項1〜7のいずれか1項に記載の方法。
- D3−クレアチンが上記被検体に投与されており、上記生体試料を分析して、上記生体試料中のD3−クレアチニンのピーク面積を求めるステップをさらに含むことを特徴とする請求項1〜8のいずれか1項に記載の方法。
- ヒトの被検体内の全身骨格筋量を定量する方法であって、上記方法は、
(a)10〜200mgのD3−クレアチン、その塩、またはこれらの水和物を上記被検体に経口投与するステップと、
(b)上記D3−クレアチンの投与後、少なくとも24時間経過させるステップと、
(c)上記被検体から生体試料を取得するステップと、
(d)請求項1〜8のいずれか1項に記載の方法に従って上記試料中のクレアチニン濃度を定量するステップと、
(e)上記生体試料中のD3−クレアチニン濃度を定量するステップと、
(f)上記被検体の全身骨格筋量を算出するために、(d)および(e)で定量した上記クレアチニンおよびD3クレアチニン濃度を用いるステップとを含むことを特徴とする方法。 - 上記被検体が女性であり、20〜40mgのD3−クレアチンが投与されることを特徴とする請求項9または10に記載の方法。
- 上記被検体が男性であり、50〜70mgのD3−クレアチンが投与されることを特徴とする請求項9または10に記載の方法。
- D3−クレアチニン一水和物が、上記被検体に投与されることを特徴とする請求項9〜11のいずれか1項に記載の方法。
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Cited By (4)
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JP2017122655A (ja) * | 2016-01-07 | 2017-07-13 | 味の素株式会社 | 骨格筋面積の評価方法 |
WO2019131497A1 (ja) * | 2017-12-25 | 2019-07-04 | 株式会社 明治 | 脱脂粉乳 |
JPWO2019131497A1 (ja) * | 2017-12-25 | 2020-12-10 | 株式会社明治 | 脱脂粉乳 |
JP7407596B2 (ja) | 2017-12-25 | 2024-01-04 | 株式会社明治 | 脱脂粉乳 |
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EP3435088A1 (en) | 2019-01-30 |
EP2788772B1 (en) | 2018-02-14 |
US20170367648A1 (en) | 2017-12-28 |
JP2018138914A (ja) | 2018-09-06 |
JP2020073890A (ja) | 2020-05-14 |
US20160220182A1 (en) | 2016-08-04 |
EP2788772A4 (en) | 2015-04-15 |
US9737260B2 (en) | 2017-08-22 |
ES2668678T3 (es) | 2018-05-21 |
EP2788772A1 (en) | 2014-10-15 |
US20190029591A1 (en) | 2019-01-31 |
WO2013086070A1 (en) | 2013-06-13 |
US20140353486A1 (en) | 2014-12-04 |
JP6294233B2 (ja) | 2018-03-14 |
CA2858368A1 (en) | 2013-06-13 |
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