JP5191386B2 - 歯周硬組織再生用組成物及び歯周硬組織を再生する方法 - Google Patents
歯周硬組織再生用組成物及び歯周硬組織を再生する方法 Download PDFInfo
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Description
項1. (i)グリセロリン酸、及びその塩よりなる群から選択される少なくとも1種、及び(ii)アスコルビン酸、その誘導体、及びその塩よりよりなる群から選択される少なくとも1種を含む培地(但し、脂肪前駆細胞の歯周硬組織細胞への分化を促進する量の副腎皮質ホルモンを含まない)で、脂肪前駆細胞を培養することを特徴とする、脂肪前駆細胞を歯周硬組織細胞に分化させる培養方法。
項2. 脂肪前駆細胞がヒト由来である、項1に記載の方法。
項3. 前記(i)成分がβグリセロリン酸であり、且つ前記(ii)成分がアルコルビン酸である、項1に記載の方法。
項4. 前記培地が、前記(i)成分を0.1〜100mg/mL、及び前記(ii)成分を1〜1000μg/mL含有するものである、項1に記載の方法。
項5. 前記培地の副腎皮質ホルモン含有量が10nM未満である、項1に記載の方法。
項6. (i)グリセロリン酸、及びその塩よりなる群から選択される少なくとも1種、及び(ii)アスコルビン酸、その誘導体、及びその塩よりよりなる群から選択される少なくとも1種を含む培地(但し、脂肪前駆細胞の歯周硬組織細胞への分化を促進する量の副腎皮質ホルモンを含まない)で培養された脂肪前駆細胞、並びにスキャフォールドを含む、歯周硬組織再生用組成物。
項7. 前記スキャフォールドが、ヒドロシキアパタイト及び/又はフィブリンゲルである、項6に記載の歯周硬組織再生用組成物。
項8. 前記脂肪前駆細胞がヒト由来である、項6に記載の歯周硬組織再生用組成物。
項9. 前記脂肪前駆細胞1.0×106cells当たり、前記スキャホールドを1〜4000mg含む、項6に記載の歯周硬組織再生用組成物。
項10. 歯周疾患を罹患している患者の歯周患部に、(i)グリセロリン酸、及びその塩よりなる群から選択される少なくとも1種、及び(ii)アスコルビン酸、その誘導体、及びその塩よりよりなる群から選択される少なくとも1種を含む培地(但し、脂肪前駆細胞の歯周硬組織細胞への分化を促進する量の副腎皮質ホルモンを含まない)で培養された脂肪前駆細胞、並びにスキャフォールドを治療有効量投与することを特徴する、歯周疾患の治療方法。
項11. 歯周疾患を罹患している患者の歯周患部に、項6に記載の歯周硬組織再生用組成物を治療有効量投与する、項10に記載の歯周疾患の治療方法。
項12. (i)グリセロリン酸、及びその塩よりなる群から選択される少なくとも1種、及び(ii)アスコルビン酸、その誘導体、及びその塩よりよりなる群から選択される少なくとも1種を含む培地(但し、脂肪前駆細胞の歯周硬組織細胞への分化を促進する量の副腎皮質ホルモンを含まない)の、脂肪前駆細胞を歯周硬組織細胞に分化させるための使用。
項13. (i)グリセロリン酸、及びその塩よりなる群から選択される少なくとも1種、及び(ii)アスコルビン酸、その誘導体、及びその塩よりよりなる群から選択される少なくとも1種を含む培地(但し、脂肪前駆細胞の歯周硬組織細胞への分化を促進する量の副腎皮質ホルモンを含まない)で培養された脂肪前駆細胞、並びにスキャフォールドの、歯周硬組織再生用組成物の製造のための使用。
第1に、本発明は、脂肪前駆細胞を歯周硬組織細胞に分化させる培養方法を提供する。
第二に、本発明は、上記(i)及び(ii)成分を含む培地(但し、脂肪前駆細胞の歯周硬組織細胞への分化を促進する量の副腎皮質ホルモンを含まない)で培養された脂肪前駆細胞、及びスキャフォールドを含む、歯周硬組織再生用組成物を提供する。
更に、本発明は、歯周硬組織の再生方法として有用である「歯周疾患の治療方法」をも提供する。当該治療方法は、歯周疾患を罹患している患者の歯周患部に、(i)グリセロリン酸、及びその塩よりなる群から選択される少なくとも1種、及び(ii)アスコルビン酸、その誘導体、及びその塩よりよりなる群から選択される少なくとも1種を含む培地(但し、脂肪前駆細胞の歯周硬組織細胞への分化を促進する量の副腎皮質ホルモンを含まない)で培養された脂肪前駆細胞、並びにスキャフォールドを治療有効量投与することを特徴するものである。
試験例1 細胞分化誘導
<試験方法>
公知の方法に従ってヒトの脂肪組織から採取した脂肪前駆細胞を、10 mM β-グリセロリン酸、50 μg/mlアスコルビン酸及び10容量% FCS(子牛胎児血清)を含むD-MEM培地(以下、「硬組織誘導培地1」と略す)或いは硬組織誘導培地1に10nMとなるようにデキサメタゾンを添加した培地(以下、「硬組織誘導培地2」と略す)にて37℃、5%二酸化炭素存在下で培養し、培養14及び21日目において、以下に記す方法に従って、各培養液中の細胞に対してアリザリンレッド染色を行い、石灰化ノジュールの形成状況を評価した。また、培養0、7、14、21、28日目の各時点において、以下に記す方法に従って、DNA量及びアルカリフォスファターゼ(以下ALPaseと略す)活性の測定を行った。なお、培養中、硬組織誘導培地1及び硬組織誘導培地2は、3日毎に交換した。
細胞の培養上清を除去後、回収した細胞をPBSにて二回洗浄後、100%エチルアルコールにて10分間固定した。斯くして固定化された細胞に対して、アリザリンレッドS溶液にて5分間染色した後、蒸留水にて洗浄した。アリザリンレッドSにて染色された部分を位相差顕微鏡にて観察した。
細胞の培養上清を除去後、回収した細胞をPBSにて二回洗浄後、蒸留水中にてハンディ−ソニックで超音波粉砕し液体画分を回収した。この液体画分に、パラニトロフェノール-2-リン酸ナトリウム(pNPP)を500μMとなるように添加し、37℃で30分間反応させた後、同溶液のO.D.415 nm吸光度を測定し、水解されたpNPP量を求めた。なお、30分間に1 nmolのpNPPを水解するALPase活性を1ユニット(U)とし、DNA量1 μg当たりのユニット値で示した。
アリザリンレッド染色した結果を図1に、またALPase活性の測定結果を図2に示す。この結果から、硬組織誘導培地1で培養した脂肪前駆細胞は、培養14日目でも、アリザリンレッドで染色された細胞の割合が高く、石灰化のジュールを形成して硬組織細胞に分化していることが確認できた(図1)。一方、デキサメタゾンを含む硬組織誘導培地2では、培養14日目では、アリザリンレッドで染色された細胞が殆ど観察されず、石灰化のジュールを形成していないことが分かった(図1)。また、硬組織誘導培地1及び硬組織誘導培地2では、硬組織細胞への分化を示す1つの指標であるALPaseの発現量は、若干異なる挙動を示した(図2参照)。
公知の方法に従ってヒトの脂肪組織から採取した脂肪前駆細胞を、硬組織誘導培地1又は硬組織誘導培地2を用いて37℃、5%二酸化炭素存在下で培養し、培養7日目に細胞を回収した。回収した細胞1.5x106cellsとハイドロキシアパタイト又はβ-TCP 40 mgを混和し、37oCにて90分間培養後、フィブリノゲン及びトロンビンを各15 μl添加し、6週齢のSCIDマウスの背中皮下に移植した。移植後4週間目に移植体を取り出し、移植体中のヒトオステオカルシンmRNA発現量をRT-PCR法にて測定した。なお、コントロールとしてHPRT(Hypoxanthine phosphoribosyl taransferase)のmRNA発現量についても同様に測定した。
2歳のビーグル犬の下顎人工的2級根分岐部病変を作製し、同時に腹部より大網を採取した。採取した大網から脂肪前駆細胞を単離し保存した。単離保存した脂肪前駆細胞を硬組織誘導培地1で37℃、5%二酸化炭素存在下で培養し、培養7日目に細胞を回収した。回収した細胞1.5×105cellsとフィブリンゲル100μlを混和し、これを手術後4週間目の上記ビーグル犬の根分岐部病変の実験側に移植した。また、根分岐部病変の対照側には、フィブリンゲルのみを填入した。移植後4週間目に下顎骨を採取し、マイクロCTにて歯周硬組織を撮影し、その再生の程度を評価した。
Claims (7)
- (i)グリセロリン酸、及びその塩よりなる群から選択される少なくとも1種、及び(ii)アスコルビン酸、その誘導体、及びその塩よりよりなる群から選択される少なくとも1種を含む培地(但し、脂肪前駆細胞の歯周硬組織細胞への分化を促進する量の副腎皮質ホルモンを含まない)で培養された脂肪前駆細胞、並びにスキャフォールドを含む、歯周硬組織再生用組成物。
- 前記スキャフォールドが、ヒドロシキアパタイト及び/又はフィブリンゲルである、請求項1に記載の歯周硬組織再生用組成物。
- 前記脂肪前駆細胞がヒト由来である、請求項1に記載の歯周硬組織再生用組成物。
- 前記脂肪前駆細胞1.0×106cells当たり、前記スキャホールドを1〜4000mg含む、請求項1に記載の歯周硬組織再生用組成物。
- 歯周疾患を罹患している患者(但し、ヒトを除く)の歯周患部に、
(i)グリセロリン酸、及びその塩よりなる群から選択される少なくとも1種、及び(ii)アスコルビン酸、その誘導体、及びその塩よりよりなる群から選択される少なくとも1種を含む培地(但し、脂肪前駆細胞の歯周硬組織細胞への分化を促進する量の副腎皮質ホルモンを含まない)で培養された脂肪前駆細胞、並びにスキャフォールドを治療有効量投与することを特徴する、歯周疾患の治療方法。 - 歯周疾患を罹患している患者(但し、ヒトを除く)の歯周患部に、請求項1に記載の歯周硬組織再生用組成物を治療有効量投与する、請求項5に記載の歯周疾患の治療方法。
- (i)グリセロリン酸、及びその塩よりなる群から選択される少なくとも1種、及び(ii)アスコルビン酸、その誘導体、及びその塩よりよりなる群から選択される少なくとも1種を含む培地(但し、脂肪前駆細胞の歯周硬組織細胞への分化を促進する量の副腎皮質ホルモンを含まない)で培養された脂肪前駆細胞、並びにスキャフォールドの、歯周硬組織再生用組成物の製造のための使用。
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