JP2022158197A - 筋肥大促進用医薬組成物及び食品組成物 - Google Patents
筋肥大促進用医薬組成物及び食品組成物 Download PDFInfo
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Abstract
Description
既述のように、筋芽細胞は、筋芽細胞同士又は既存の筋繊維と融合して筋管細胞となり、筋管細胞は成熟して筋繊維となる。本試験では、マウス筋芽細胞株を筋管細胞へと分化させ、当該筋管細胞を5-アセチル-1-ベンジルピロリジン-2-オン存在下で培養した後、培養した筋管細胞の短径(myotube diameter)を測定して、5-アセチル-1-ベンジルピロリジン-2-オンに筋肥大促進作用があるか否かを確認した。
マウス筋芽細胞株C2C12
European Collection of Authenticated Cell Culture(ECACC)(Salisbury, England)より入手。
・5-アセチル-1-ベンジルピロリジン-2-オンをDMSO(Dimethyl Sulfoxide:ジメチルスルホキシド)に溶解して調整した。
・0.0006μg/ml、0.006μg/ml、0.06μg/ml、0.6μg/ml、6μg/mlの濃度に調整した。
1)C2C12 筋芽細胞を48-well培養プレート(250μl容量)に播種し、増殖培地で培養。
2)筋芽細胞がコンフルエントになった時点で分化培地に交換し、さらに6日間培養し筋 管細胞に分化。
3)分化6日目の筋管細胞を各濃度の検体存在下でさらに48時間培養した。
4)培養後、筋管細胞をPBS(-)(Phosphate-buffered saline:りん酸緩衝生理食塩水 ,Ca2+とMg2+不含)で3回洗浄した後、4%paraformaldehydeを含むPBS(-)を加え、 37℃のインキュベーター内で20分間静置して細胞を固定。
5)再度PBS(-)で筋管細胞を3回洗浄後、0.1%TritonX-100を含むPBS(-)を加え、3 7℃のインキュベーター内で5分間静置。
6)再度PBS(-)で筋管細胞を3回洗浄後、37℃のインキュベーター内で Blocking re agent(10% FBS、5% 牛血清アルブミン(BSA)、0.1% sodium azide を含む PBS(-) )と1時間反応させた。
7)再度PBS(-)で筋管細胞を3回洗浄後、3% BSA と抗ミオシン重鎖(MyHC)マウスモ ノクローナル抗体(1/2000)を含むPBS(-)中で4℃で一晩静置。
8)再度PBS(-)で筋管細胞を6回洗浄後、37℃のインキュベーター内で 3% BSA と Alexa fluor 抗マウス IgG(1/3000)を含むPBS(-)と1時間反応させた。
9)再度PBS(-)で筋管細胞を6回洗浄後、PBS(-)で希釈したDAPI(終濃度1μg/m l)と37℃のインキュベーター内で10分間反応させ、PBS(-)で1回洗浄。
10)control(検体存在なし)と各濃度の検体存在下における筋管細胞(核を2個以上有 するMyHC陽性の筋管細胞)を蛍光顕微鏡(BZ-9000、Keyence, Osaka, Japan)にて10 倍の倍率で異なる箇所を3カ所撮影し,各撮影箇所につき約100本(計約300本) の筋管細胞の短径を次の手順で測定。
11)各試験区の撮影箇所における筋管細胞の短径をImage J software(version 1.44p; Na tional Institutes of Health, Bethesda, MD, USA)で測定。
12)各試験区の筋管細胞短径の平均値を求めた後、controlにおける短径平均値を1とし たときの各濃度の検体存在下の相対値を求め、検体存在下における筋肥大効果を比較評 価した。
control(検体存在なし)と各濃度の検体存在下の2群間で筋管細胞の短径平均値の有意差検定をStudentのt検定により行ったところ、特に終濃度0.06μg/mlの検体存在下で培養された筋管細胞において、その短径が有意に大きくなっていることが確認できた(controlと比較してP<0.05の有意水準)。よって、5-アセチル-1-ベンジルピロリジン-2-オンによる筋管細胞の短径増大の促進が確認され、筋肥大促進効果が認められた。
Claims (2)
- 5-アセチル-1-ベンジルピロリジン-2-オンを有効成分として含有してなる筋肥大促進用医薬組成物。
- 5-アセチル-1-ベンジルピロリジン-2-オンを有効成分として含有してなる筋肥大促進用食品組成物。
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