JP7016168B2 - 歯周炎治療薬及び歯周炎治療用組成物 - Google Patents
歯周炎治療薬及び歯周炎治療用組成物 Download PDFInfo
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Description
(1)肝細胞増殖因子(HGF)シグナル阻害剤を有効成分として含有する歯周炎治療薬。
(2)前記HGFシグナル阻害剤が、HGF特異的結合物質、HGF発現阻害剤、HGF活性化酵素特異的結合物質、HGF活性化酵素発現阻害剤、HGF活性化酵素阻害剤、c-Met特異的結合物質、c-Met発現阻害剤及びc-Met阻害剤からなる群より選択される、(1)に記載の歯周炎治療薬。
(3)(1)又は(2)に記載の歯周炎治療薬及び薬学的に許容可能な担体を含む歯周炎治療用組成物。
まず、発明者らが以前に開発した、歯肉線維芽細胞のコラーゲンゲル三次元培養系について図1(a)~(d)を参照しながら説明する。この培養系は、歯周組織におけるコラーゲンの分解に対する被験物質の影響をインビトロにおいて評価することができ、インビボに近い結果を得ることができるものである。
1実施形態において本発明は、HGFシグナル阻害剤を有効成分として含有する歯周炎治療薬を提供する。
HGF特異的結合物質としては、上述したHGFのプロフォームに特異的に結合し上述したHGF活性化酵素によるHGFの活性化を阻害するもの、HGFに特異的に結合しHGFとc-METとの結合を阻害するもの、HGFに特異的に結合しc-METの下流へのシグナル伝達を遮断するもの等が挙げられる。
発現阻害剤としては、例えば、siRNA、shRNA、miRNA、リボザイム、アンチセンス核酸、低分子化合物、HGFやc-Metの発現を阻害する因子等が挙げられる。これらの発現阻害物質を生体に投与することにより、HGF、HGF活性化酵素、c-Metの発現を阻害することができる。その結果、HGFシグナルを阻害し、歯周炎を治療することができる。
HGF活性化酵素阻害剤とは、HGFのプロフォーム(1本鎖型)を活性化して2本鎖型に変化させる酵素を阻害する物質である。具体的なHGF活性化酵素阻害剤としては、例えば、HGFアクチベーターインヒビター タイプ-1、HGFアクチベーターインヒビター タイプ-2、HGF活性化酵素に対する抗体(例えば、抗HGFA抗体)等が挙げられる。
c-Met阻害剤とは、c-Metの下流のシグナル伝達を遮断する低分子化合物である。具体的には、例えば、PHA665752(CAS番号:477575-56-7)、Quercetin(CAS番号:117-39-5)、MSC2156119J(CAS番号:1100598-30-8)、Tivantinib(CAS番号:905854-02-6)、XL880(CAS番号:849217-64-7),PF-02341066(CAS番号:877399-52-5)、漢方方剤の一種である麻黄湯等が挙げられる。
1実施形態において、本発明は、上述した歯周炎治療薬及び薬学的に許容可能な担体を含む歯周炎治療用組成物を提供する。
[その他の実施形態]
コラーゲンゲル三次元培養系を用いて、歯周炎患者由来の歯肉線維芽細胞によるコラーゲンの分解に対するHGF中和抗体の影響を検討した。
歯周外科手術の際に切除され不要となった歯肉片由来の組織を細切後、組織片を細胞培養プレートの底に静置した。続いて、組織片から外生した細胞を第1代として継代培養を行い、ヒト歯肉線維芽細胞を得た。
歯周外科手術の際に切除され、不要となった歯肉片をDispase処理した後、結合組織部分から剥離した上皮組織を細切し、組織片をプレートの底に静置した。続いて、組織片から外生した細胞を第1代として継代培養を行い、ヒト歯肉上皮細胞を得た。
セルマトリックスtypeI-A(新田ゼラチン)、5×DMEM、再構成用緩衝液(新田ゼラチン)を混合し、コラーゲン混合溶液を作製した。このコラーゲン混合溶液に、HGF中和抗体(型式「AB-294-NA」、R&D社)を終濃度20μg/mLとなるように添加した。
続いて、作製した各コラーゲンゲルを37℃でインキュベートし、24時間後にコラーゲンゲルをプレートから剥がし、ゲルを浮遊させた(培養1日目)。培地には上述したものと同濃度の各被験物質(HGF中和抗体及びHGF)を添加した。続いて、37℃でコラーゲンゲルの浮遊培養を継続し、浮遊培養開始後5日目にコラーゲンゲルを観察した。
続いて、図2(a)及び図2(d)のコラーゲンゲルをパラホルムアルデヒド固定後パラフィン包埋して薄切切片を作製した。続いて、これらの薄切切片をヘマトキシリン・エオジン染色して顕微鏡観察した。図3(a)及び(b)は、ヘマトキシリン・エオジン染色の結果を示す顕微鏡写真である。図3(a)は、対照である図2(a)のコラーゲンゲルの薄切切片の染色結果を示す写真である。また、図3(b)は、HGF中和抗体を添加した図2(d)のコラーゲンゲルの薄切切片の染色結果を示す写真である。
実験例1と同様のコラーゲンゲル三次元培養系を用いて、歯周炎患者由来の歯肉線維芽細胞によるコラーゲンの分解に対するHGF中和抗体の影響を検討した。本実験例では、分解されずに残存したコラーゲンの定量を行った。
セルマトリックスtypeI-A(新田ゼラチン)、5×DMEM、再構成用緩衝液(新田ゼラチン)を混合し、コラーゲン混合溶液を作製した。このコラーゲン混合溶液に、HGF中和抗体(型式「AB-294-NA」、R&D社)を終濃度20μg/mLとなるように添加した。また、比較のために、被験物質を含まない試料(対照)も作製した。
続いて、作製した各コラーゲンゲルを37℃でインキュベートし、24時間後にコラーゲンゲルをプレートから剥がし、ゲルを浮遊させた(培養1日目)。試験群の培地には上述したものと同濃度のHGF中和抗体を添加した。続いて、37℃でコラーゲンゲルの浮遊培養を継続した。
浮遊培養開始後5日目にコラーゲンゲルを回収し、ゲル中のコラーゲン残量を定量した。回収したゲルを熱処理によって可溶化し、コラーゲンを定量した。コラーゲンの定量には、市販のキット(商品名「Sircol Soluble/Insoluble Collagen Assay Kit」、バイオカラー社製)を使用した。
実験例1と同様のコラーゲンゲル三次元培養系を用いて、歯周炎患者由来の歯肉線維芽細胞によるコラーゲンの分解に対するHGF中和抗体の影響を、DNAマイクロアレイを用いたトランスクリプトーム解析により検討した。
セルマトリックスtypeI-A(新田ゼラチン)、5×DMEM、再構成用緩衝液(新田ゼラチン)を混合し、コラーゲン混合溶液を作製した。このコラーゲン混合溶液に、HGF中和抗体(型式「AB-294-NA」、R&D社)を終濃度20μg/mLとなるように添加した。また、比較のために、被験物質を含まない試料(対照)及び、HGF(型式「100-39」、ぺプロテック社)を終濃度50ng/mLとなるように添加した試料も作製した。
続いて、作製した各コラーゲンゲルを37℃でインキュベートし、24時間後にコラーゲンゲルをプレートから剥がし、ゲルを浮遊させた(培養1日目)。試験群の培地には上述したものと同濃度のHGF中和抗体を添加した。続いて、37℃でコラーゲンゲルの浮遊培養を継続した。
浮遊培養開始後5日目にコラーゲンゲルを回収し、質量を測定した。図5(a)及び(b)は回収したコラーゲンゲルの写真である。図5(a)は上述したPAF1を用いた結果を示し、図5(b)は上述したPAF2を用いた結果を示す。図5(a)及び(b)中、「対照」は対照のコラーゲンゲルであることを示し、「HGF」はHGFを添加したコラーゲンゲルであることを示し、「HGF中和抗体」はHGF中和抗体を添加したコラーゲンゲルであることを示す。また、下記表1に、各コラーゲンゲルの質量を測定した結果を示す。
本発明の歯周炎治療薬をヒトに臨床応用する前に、サルを用いた実験を行うことが必要となる。そこで、実験例1と同様のコラーゲンゲル三次元培養系を用いて、歯周炎を自然発症したサル由来の歯肉線維芽細胞によるコラーゲンの分解に対するHGF中和抗体の影響を検討した。なお、サルの歯肉上皮細胞は培養が困難であるため、歯肉上皮細胞としてはヒトの歯肉上皮細胞を使用した。
歯周炎を自然発症したサル(Macaca fascicularis、霊長類医科学研究センター飼育)の安楽死個体由来の歯肉片の組織を細切後、組織片を細胞培養プレートの底に静置した。続いて、組織片から外生した細胞を第1代として継代培養を行い、サル歯肉線維芽細胞を得た。
セルマトリックスtypeI-A(新田ゼラチン)、5×DMEM、再構成用緩衝液(新田ゼラチン)を混合し、コラーゲン混合溶液を作製した。このコラーゲン混合溶液に、HGF中和抗体(型式「AB-294-NA」、R&D社)を終濃度20μg/mLとなるように添加した。また、比較のために、被験物質を含まない試料(対照)及び、HGF(型式「100-39」、ぺプロテック社)を終濃度50ng/mLとなるように添加した試料も作製した。
続いて、作製した各コラーゲンゲルを37℃でインキュベートし、24時間後にコラーゲンゲルをプレートから剥がし、ゲルを浮遊させた(培養1日目)。試験群の培地には上述したものと同濃度のHGF中和抗体を添加した。続いて、37℃でコラーゲンゲルの浮遊培養を継続した。
図6(a)~(f)は浮遊培養開始後5日目の各コラーゲンゲルを撮影した写真である。図6(a)~(c)は上述したSAF1を用いた結果を示し、図6(d)~(f)は上述したSAF2を用いた結果を示す。
続いて、図6(a)及び(c)のコラーゲンゲルをパラホルムアルデヒド固定後パラフィン包埋して薄切切片を作製した。続いて、これらの薄切切片をヘマトキシリン・エオジン染色して顕微鏡観察した。
Claims (2)
- 肝細胞増殖因子(HGF)中和抗体を有効成分として含有する歯周炎治療薬。
- 請求項1に記載の歯周炎治療薬及び薬学的に許容可能な担体を含む歯周炎治療用組成物。
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