JP7066209B2 - 糖代謝異常の検出方法と予防及び治療 - Google Patents
糖代謝異常の検出方法と予防及び治療 Download PDFInfo
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Description
レプリコン細胞Huh7.5及びHuh7.5/Con1(遺伝子型1b)を高グルコースのDulbecco’s Modified Eagle’s培地(DMEM)で培養した。これを5%二酸化炭素/37℃のインキュベーター内で培養し、10%熱不活性化ウシ胎児血清(heat-inactivated fetal bovine serum,heat-inactivated FBS)、5%抗生物質-抗菌薬(antibiotic-antimycotic)溶液、100U/mLのペニシリン、100μg/mLのストレプトマイシン、及び5%非必須アミノ酸溶液を補充した。そして、細胞株に24時間の飢餓処理を施した後、10%FBS及びアンノナシンを含有する新鮮培地を加えて細胞実験を行った。一方、Con1細胞株については引き続き完全培地(0.5mg/mLのG418を含有)で培養した。
30μgの細胞溶解物サンプルを10%SDS-polyacrylamideゲル上に配置し、電気泳動してから、PVDF膜にブロットした。ブロッキングの後、当該膜を標的タンパクであるGPx2、GLUT1、PCK1(PEPCK)、GLUT2、及びG6PC(G6Pase)抗体(一次抗体)を含有する溶液にそれぞれ浸漬し、2時間インキュベートしてから、0.1%tween 20を含有するPBSで5分間洗浄した。続いて、当該膜をHRP複合二次抗体で1時間インキュベートした。そして、増強化学発光試薬(ECL)を膜に加えて照射し、タンパク質分布を観察した。
細胞を各ウェル1.2×105の数量で6ウェルプレート培地に配置し、一晩成長させた。次に、特定の所定時間だけLipofectAMINE(登録商標)を用い、GPx2過剰発現プラスミド及びsiGPx2(GPx2 siRNA)を当該細胞にトランスフェクションした。また、対照群として、担体にpcDNA(空担体,vihecle)又はsiNC(control siRNA)のみをトランスフェクションした。
24週間:高脂肪餌による糖代謝異常誘発マウス:6週齢のC57BL/6オスマウスを病原無し環境で2週間飼育した。その後、各群が少なくとも5匹のマウスを有するよう、全てのマウスをランダムに6群に分けた。群1には正常餌を与えた。群2には正常餌を与え、且つ、毎週1回マウスの尾部からプラスミド担体を静脈注射した(Turbofectに溶解したものを50μg/plasmid/マウス/週)。群3には正常餌を与え、且つ、毎週1回マウスの尾部からGPx2過剰発現プラスミドを静脈注射した(Turbofectに溶解したものを50μg/plasmid/マウス/週)。群4には、正常餌よりも30%増しの高脂肪餌を与えた。群5には、正常餌よりも30%増しの高脂肪餌を与え、且つ、毎週1回マウスの尾部からプラスミド担体を静脈注射した(Turbofectに溶解したものを50μg/plasmid/マウス/週)。群6には、正常餌よりも30%増しの高脂肪餌を与え、且つ、毎週1回マウスの尾部からGPx2過剰発現プラスミドを静脈注射した(Turbofectに溶解したものを50μg/plasmid/マウス/週)。24週間後に全てのマウスを殺処理し、組織を採取して3つの部分に分けた。第1部分については4%ホルムアルデヒドで固定してパラフィンで包埋し、組織切片として研究した。第2部分の組織については組織用RNAサンプル保存液(RNAlater)に保存し、後の遺伝子発現検出に備えて-80℃環境下に置いた。第3部分の組織については液体窒素に保存した。
全てのマウスを12時間絶食させてから、腹膜内にグルコースを注射した(グルコース2g/体重kg)。次に、グルコース注射から0分、30分、60分及び120分の時点で尾部から採血し、血糖検出器を用いて血糖濃度を検出した。
パラフィンで包埋した肝臓組織を4μmサイズの切片に切断し、100℃でマイクロ波を30分間かけて、非特異性反応をブロッキングした。次に、一次抗体により切片を4℃下で一晩培養した後、0.2%Tween 20を含有するPBSで10分間の洗浄を2度行った。次に、ビオチン標識二次抗体で当該切片を1時間培養した後、0.2%Tween 20を含有するPBSで10分間の洗浄を2度行った。最後に、当該切片を染色し、各種タンパクの発現を観察した。
48名のC型肝炎患者を募集して、それぞれを経口ブドウ糖負荷試験及びグリコヘモグロビンに基づき分類したところ(表1参照)、19名が正常血糖患者、11名が耐糖能異常患者、18名が2型糖尿病患者であった。
患者ごとにウィルスの定型分析を行い、ウィルスの遺伝子型を特定するとともに、ウィルスの定量分析を行った。次に、5名の正常血糖患者、3名の耐糖能異常患者、3名の2型糖尿病患者をランダムに抽出した。且つ、インスリン又は経口血糖降下薬の服用経験のない者をサンプルとし、遺伝子チップ実験を行うことで候補遺伝子を選別した。その他のサンプルについては検証群とし、候補遺伝子の検証に用いた。2つのサンプル群の基本データについては表2に示す通りであった。
各患者の肝臓切片を収集し、各々よりRNAを抽出してRNA濃度を測定してから、それぞれをcDNAに変換して完全性を確認した。結果は図4に示す通りであった。
マイクロアレイチップ実験により全遺伝子の発現検出を行い、全チップの結果を正則化したところ、図5に示すようになった。
遺伝子ネットワーク解析の結果、GPx2は、脂肪酸の酸化、耐糖能、グルコースの取り込み、及び糖新生の遺伝子との間にいずれも密接な関係を有すると推測された。
細胞実験で、糖代謝におけるGPx2の役割を検証した。C型肝炎ウィルス(Hepatitis C virus,HCV)は、GPx2の発現を抑制することでHCVによる肝細胞の糖代謝異常(グルコース輸送の低下と糖新生の増加)を招来し得る。これに対し、GPx2の発現を増加させれば、HCVに起因する糖代謝異常現象を明らかに改善可能である。
Claims (6)
- 所望個体における2型糖尿病の進行リスクを検出する方法であって、
(a)前記所望個体の検体におけるGPx2のみの遺伝子発現量、GPx2のみのタンパク発現量、又はGPx2のみのタンパク活性を検出し、
(b)前記所望個体の検体におけるGPx2のみの遺伝子発現量、GPx2のみのタンパク発現量、又はGPx2のみのタンパク活性を正常個体からの検体のGPx2のみの発現量、GPx2のみのタンパク発現量、又はGPx2のみのタンパク活性と比較して、前記所望個体からの検体のGPx2のみの遺伝子発現量、GPx2のみのタンパク発現量、又はGPx2のみのタンパク活性が前記正常個体からの検体のGPx2のみの発現量、GPx2のみのタンパク発現量、又はGPx2のみのタンパク活性よりも低く、P値<0.05の場合には、前記所望個体が2型糖尿病を進行させるリスクが高い糖代謝異常状態を有することを意味する方法であって、前記検体は、肝臓からなる群より選択する、方法。
- 前記個体は動物であり、ヒト及び哺乳類を含む請求項1に記載の方法。
- 前記個体はヒトである請求項1に記載の方法。
- GPx2遺伝子をコードする核酸またはGPx2タンパク質を利用して2型糖尿病を予防又は治療する医薬組成物を調製する使用であって、前記組成物は、有効投与量のGPx2遺伝子をコードする核酸またはGPx2タンパク質及び医薬的に許容可能な担体を含む使用。
- 前記2型糖尿病は、C型肝炎ウィルスへの感染又は高脂肪食の摂取により招来される請求項4に記載の使用。
- 前記有効投与量とは、少なくとも、投与対象の前記GPx2遺伝子をコードする核酸またはGPx2タンパク質を正常発現量まで回復させられる投与量である請求項4に記載の使用。
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WO2005058142A3 (en) | 2003-12-16 | 2006-03-02 | Univ Emory | Diabetes diagnostic |
WO2010005533A2 (en) | 2008-06-30 | 2010-01-14 | The Johns Hopkins University | Compositions and methods for the treatment of ocular oxidative stress and retinitis pigmentosa |
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