JP6948059B2 - miR−140−3pによる骨芽細胞からのオステオカルシン産生促進 - Google Patents
miR−140−3pによる骨芽細胞からのオステオカルシン産生促進 Download PDFInfo
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Description
骨芽細胞分化の過程で、BMP経路に作用するのはmiR−29、miR−208、miR−133、miR−135、miR−138であり、Wnt経路に作用するのはmiR−29とmiR−335である(非特許文献1)。miR−29は両経路に作用するが、作用機序は独立していると考えられる。
ゲノム中に存在するmiRNAは500種類以上報告されているが、その多くのmiRNAに関する機能は依然不明である。
すなわち、本発明は以下からなる:
1.miR−140−3p、その前駆体およびこれらをコードするDNA構築物からなる群から選択される少なくとも1つを有効成分として含む、オステオカルシン産生促進剤。2.miR−140−3p、その前駆体およびこれらをコードするDNA構築物からなる群から選択される少なくとも1つがTGFβ3の遺伝子発現を抑制するものである、前項1に記載の剤。
3.TGFβ3の遺伝子発現の抑制がTGFβ3の3’UTRへの結合によるものである、前項2に記載の剤。
4.miR−140−3p、その前駆体およびこれらをコードするDNA構築物からなる群から選択される少なくとも1つは、Wnt3aの過剰発現によりその発現が抑制されるものである、前項1に記載の剤。
5.前項1〜4のいずれか一項に記載の剤を含む、骨形成促進剤。
6.前項1〜4のいずれか一項に記載の剤をインビトロにおいて細胞に供給することにより、オステオカルシン産生を促進する方法。
7.オステオカルシン産生促進がTGFβ3の発現の抑制によるものである、前項6に記載の方法。
8.miR−140−3pの発現量の促進及び/又はTGFβ3の発現量の抑制をマーカーとして、オステオカルシン産生促進に有効な物質をスクリーニングする方法であって、
(a)被検物質の存在下に細胞を培養する工程、
(b)該細胞における各miR−140−3p及び/又はTGFβ3の発現量を測定する工程、及び
(c) miR−140−3pの発現量を増加させる物質及び/又はTGFβ3の発現量を抑制する物質を選択する工程、
を含む、方法。
9.細胞が骨芽細胞である、前項8に記載のスクリーニング方法。
10.miR−140−3pの発現量の促進及び/又はTGFβ3の発現量の抑制をマーカーとして、骨粗鬆症の治療又は予防に有効な物質をスクリーニングする方法であって、
(a)被検物質の存在下に細胞を培養する工程、
(b)該細胞における各miR−140−3p及び/又はTGFβ3の発現量を測定する工程、及び
(c) miR−140−3pの発現量を増加させる物質及び/又はTGFβ3の発現量を抑制する物質を選択する工程、
を含む、方法。
11.miR−140−3pからなる、健康状態を把握するためのバイオマーカー。
12.miR−140−3pからなる、骨形成を判定するためのバイオマーカー。
13.miR−140−3pからなる、骨粗鬆症の治療効果を判定するためのバイオマーカー。
14.前項1〜4のいずれか一項に記載の剤を含む、骨粗鬆症予防治療剤。
15.前項1〜4のいずれか一項に記載の剤を含む、代謝機能改善剤。
16.代謝機能改善が膵臓β細胞におけるインスリン産生の促進である、前項15に記載の剤。
17.代謝機能改善が脂肪細胞におけるインスリン感受性の促進である、前項15に記載の剤。
18.少なくとも前項1〜5及び14〜17のいずれか一項に記載の剤を含む医薬組成物であって、薬学的に許容される担体、アジュバント、塩、希釈剤及び/又は賦形剤を含む、医薬組成物。
(a) 被検物質の存在下に細胞を培養する工程、
(b)該細胞における各miR−140−3pの発現量を測定する工程、及び
(c) miR−140−3pの発現量を増加させる物質を選択する工程、を含む方法でスクリーニングすることができる。
(a) 被検物質の存在下に細胞を培養する工程、
(b)該細胞におけるTGFβ3の発現量を測定する工程、及び
(c)TGFβ3の発現量を減少させる物質を選択する工程、を含む方法でスクリーニングすることができる。
(a) 被検物質の存在下に細胞を培養する工程、
(b)該細胞におけるmiR−140−3pの発現量及び/又はTGFβ3の発現量を測定する工程、及び
(c) miR−140−3pの発現量を増加させる物質及び/又はTGFβ3の発現量を減少させる物質を選択する工程、を含む方法でスクリーニングすることができる。
1.Wnt3aの過剰発現
マウス由来骨芽細胞を4ウェルプレート(5ml)の各ウェルに2.5x104個ずつ及び6ウェルプレート(2ml)の各ウェルに1x105個ずつ培養した。各ウェル内の培地は、phenol red-free α minimum essentialmedium、10% fetal bovine serum、penicillin、streptomycinを含むものからなる。培養したマウス由来骨芽細胞に、Wnt3a(NM-009522、開始コドンから1275bp)を発現するベクター(pAd/CMV/V5-DEST)又はeGFP(L29345、開始コドンから820bp)を発現するベクター(コントロール)を感染させ(MOI:200)、感染から1、3、7日経過後の細胞からRNAの抽出を行い、感染から3日経過後の細胞を使用してmiRNAマイクロアレイ、アルカリホスファターゼ(ALP)染色、ウェスタンブロットを行った。
RNA抽出はmiRNeasy Mini kit又はTRIzolで行い、ウェスタンブロットには抗リン酸化βカテニン抗体(Cell Signaling Technology)、抗TGFβ3抗体(Abcam)、抗RUNX2抗体(CellSignaling Technology)を使用した。概要を図1に示す。
図1に示すとおりに、マウス由来骨芽細胞におけるWnt3aの過剰発現の解析を行ったところ、骨芽細胞においてリン酸化(Ser675)状態のβカテニンの発現が多くみられた(図2)。リン酸化βカテニンは核内に移行し、他の転写因子と複合体を形成して標的遺伝子であるアルカリホスファターゼ(ALP)の発現を促進すると考えられる。
その結果、Wnt3aの過剰発現により、マウス由来骨芽細胞においてアルカリホスファターゼ(ALP)の活性が促進されたことが認められた(図3)。
Wnt3aとeGFPをそれぞれマウス由来骨芽細胞に導入し、miRNeasy Mini kitを用いてmiRNAの精製を行った。マイクロアレイ解析は3D-Gene miRNAMicroarray Platform(東レ)を用いて行った。
Wnt3aの蛍光強度をグローバルノーマライゼーションしたものを縦軸に、コントロールのeGFPの蛍光強度をグローバルノーマライゼーションしたものを横軸とし、スキャッタープロットが得られた(図5)。
図5に示すとおり、Wnt3aの過剰発現により2倍以上変動したmiRNAのうち、発現の上昇したmiRNAが14種、発現の減少したmiRNAが21種得られた。
図5中の矢印で示すスポットはmiR−140−3pであり、Wnt3aの過剰発現による発現の変動が大きく、かつ発現量が高いmiRNAとして得られた。
図1に示すとおりに、Wnt3aを過剰発現させたマウス由来骨芽細胞の発現解析を行ったところ、miR−140−3pの発現の抑制が認められた(図6)。
Wnt3aの発現に関連するmiRNA遺伝子として得られたmiR−140−3pの標的遺伝子を公知のデータベース[miRBase(http://www.mirbase.org/)、miRDB(http://www.mirdb.org/)、microRNA.org(http://www.microrna.org/microrna/home.do)]を使用して予測した。その結果、miR−140−3pの標的遺伝子としてTGFβ3が候補に挙がった。そこで、図1に示すとおりに、Wnt3aの過剰発現がTGFβ3の発現に及ぼす影響を調べた。
その結果、Wnt3aの過剰発現によりマウス由来骨芽細胞においてTGFβ3の発現が上昇することがわかった(図7)。
アルカリホスファターゼは骨芽細胞の初期分化マーカーであり、オステオカルシンは骨芽細胞の後期分化マーカーである。初期分化の段階ではmiR−140−3pは弱い発現しか認められないが、分化が進むにつれてmiR−140−3pとオステオカルシンの発現促進が認められた。
マウス由来骨芽細胞にmiR−140−3pと同様の配列を持つmiR−140−3p mimic又はコントロールmiR−NC(mirVana(商標) miRNA mimic又はmimic negative control、Ambion)を導入したのちに、マウス由来骨芽細胞を3日間培養し、TGFβ3の遺伝子発現及びタンパク質発現を調べた。
miR−NCを導入した細胞と比較して、miR−140−3p mimicを導入した細胞では、TGFβ3の発現がmRNA、タンパク質レベルとも低下した(図8)。
TGFβ3の3’UTR領域とmiR−140−3pは相補的な配列を有している(図9)。miR−140−3pを発現させた細胞ではルシフェラーゼの発現が抑制された(図9)。よって、miR−140−3pはTGFβ3の3’UTR領域を介してTGFβ3の転写活性を抑制することが示された。
マウス由来骨芽細胞を24ウェルプレート(1ml)の各ウェルに3x104個ずつ培養した。各ウェル内の培地はphenol red-free α minimum essentialmedium、10% fetal bovine serum、penicillin、streptomycinを含むものからなる。培養したマウス由来骨芽細胞に、miR−140−3p mimic又はnegative control(NC)のmiRNAをトランスフェクションし、1日経過後に培地交換(MC)を行い、トランスフェクションから2日後の細胞のRNAの抽出を行い、トランスフェクションから3日後の細胞をウェスタンブロットに使用した。概要を図10に示す。
その結果、miR−140−3p mimicをマウス由来骨芽細胞へ導入することにより、オステオカルシンの発現が促進された(図11)。
recombinant TGFβ3(rTGFβ3、Cell Signaling Technologyから購入)を投与する24時間前に、マウス由来骨芽細胞を24ウェルプレート(1ml)の各ウェルに4x104個ずつ培養した。各ウェル内の培地はphenolred-free α minimum essential medium、10% fetal bovineserum、penicillin、streptomycinを含むものからなる。rTGFβ3を5ng/mlの濃度で培地に投与し、rTGFβ3の投与から2、5、24、72時間後にRNAの抽出を行った。概要を図12に示す。
今後の高齢化社会の進展を考慮すると、骨粗鬆症の発症予防は健康寿命の延伸に重要な役割を果たすと考えられる。従来の骨粗鬆症治療薬の使用は骨粗鬆症と診断されることが必須であり、副作用の発生も懸念される。本発明に係るmiR−140−3pは治療だけでなく予防にも活用できると考えられ、病気や介護の予防の促進と、公的保険に依存しない健康産業の創出に貢献し、健康産業を創出できると思われる。
Claims (7)
- miR−140−3pをコードするDNA構築物を有効成分として含む、骨芽細胞におけるオステオカルシン産生促進剤。
- miR−140−3pをコードするDNA構築物がTGFβ3の遺伝子発現を抑制するものである、請求項1に記載の剤。
- TGFβ3の遺伝子発現の抑制がTGFβ3の3’UTRへの結合によるものである、請求項2に記載の剤。
- miR−140−3pをコードするDNA構築物は、Wnt3aの過剰発現によりその発現が抑制されるものである、請求項1に記載の剤。
- 請求項1〜4のいずれか一項に記載の剤をインビトロにおいて骨芽細胞に供給することにより、オステオカルシン産生を促進する方法。
- オステオカルシン産生促進がTGFβ3の発現の抑制によるものである、請求項5に記載の方法。
- miR−140−3pの発現量の促進をマーカーとして、オステオカルシン産生促進に有効な物質をスクリーニングする方法であって、
(a)被検物質の存在下に骨芽細胞を培養する工程、
(b)該細胞におけるmiR−140−3pの発現量を測定する工程、及び
(c) miR−140−3pの発現量を増加させる物質を選択する工程、
を含む、方法。
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