JP6072013B2 - 生体適合性材料及びその使用 - Google Patents
生体適合性材料及びその使用 Download PDFInfo
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- JP6072013B2 JP6072013B2 JP2014513003A JP2014513003A JP6072013B2 JP 6072013 B2 JP6072013 B2 JP 6072013B2 JP 2014513003 A JP2014513003 A JP 2014513003A JP 2014513003 A JP2014513003 A JP 2014513003A JP 6072013 B2 JP6072013 B2 JP 6072013B2
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- garnite
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- bone
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- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
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- A61L27/10—Ceramics or glasses
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Description
本出願は、オーストラリア仮特許出願第2011902160号(2011年6月1日)及び第2011903923号(2011年6月23日)の利益を請求する。両特許出願の開示事項を、参照によって本明細書中に組み入れる。
本明細書及び特許請求の範囲において、以下の専門用語は、下記の定義に従って用いるものとする。本明細書中に使用する専門用語は、本発明の特定の実施形態を説明するためにのみ用いるのであって、限定を意図しないことも理解される。特に定義しない限り、本明細書中に使用する全ての技術用語及び科学用語は、本発明が関連する技術分野における当業者によって普通に理解されるのと同じ意味を有する。
生物学的検査のために種々の群のスキャフォールドを調製した。
1- HA/TCP
2- Sr-HT
3- Sr-HT-5%ガーナイト
4- Sr-HT-11%ガーナイトスキャフォールド
5- Sr-HT-14%のガーナイトスキャフォールド
6- Sr-HT/ガーナイト(20重量%)スキャフォールド
初代HOBの単離及び培養
HOBを、以前に記載された(Roohani-Esfahani S.I.、Nouri-Khorasani S.、Lu Z.、Appleyard R.、Zreiqat H.、「The influence hydroxyapatite nanoparticle shape and size on the properties of biphasic calcium phosphate scaffolds coated with hydroxyapatite-PCL composites」、Biomaterials、2010年7月;31(21):5498〜509頁)ようにして、健常なヒト海綿骨から単離した。簡潔には、骨を、1mm3の試験片に分割し、リン酸緩衝生理食塩水(PBS)中で数回洗浄し、37℃においてPBS中0.02%(w/v)トリプシンで90分間消化させた。消化された細胞を、10%(v/v)熱不活性化ウシ胎児血清(FCS)、2mM L-グルタミン、25mM Hepes緩衝液、2mMピルビン酸ナトリウム、30mg/mLペニシリン、100mg/mLストレプトマイシン及び1mMのL-アスコルビン酸リン酸エステルマグネシウム塩を補充したα-基礎培地(α-MEM)を含む完全培地中で培養した。細胞は、5%CO2を用いて37℃において培養し、培地は、コンフルエンスになるまで3日毎に新しくし、コンフルエンスになったら細胞を継代した。
細胞が80〜90%のコンフルエンスに達したら、細胞を、TrypLE(登録商標)Expressを用いてトリプシン処理し、続いて遠心分離し、完全培地中に懸濁させて、mL当たり細胞11×104個の密度を有する細胞懸濁液を生成した。次いで、100μLの細胞懸濁液を、24ウェル細胞培養プレート中に置かれた各スキャフォールドに加えた。37℃のインキュベーター中で1時間インキュベート後、1mLの細胞培養培地を各ウェルに加えた。SEM観察のために、24時間の細胞を、4%のパラホルムアルデヒド溶液中で固定し、PBS中1%四酸化オスミウム中で1時間、後固定し、次に一連の段階的なエタノール溶液(30、50、70、90、95及び100%)中で脱水し、最後に、ヘキサメチルジシラザン(hexamethyldisilizane)中で3分間乾燥させた。乾燥したコーティング試料に、金をスパッタリングしてから、標準的な手順を用いて走査型電子顕微鏡(SEM)観察を行った。
スキャフォールド上で培養したHOBから、Trizol試薬(Sigma)及びRNeasy Mini Kit(Qiagen)を用いて製造業者の使用説明書に従って、全RNAを単離した。0.7μgの全RNAから、Omniscript RT Kitを用いて製造業者の使用説明書に従って、ファーストストランドcDNAを合成した。cDNAを、骨芽細胞関連遺伝子Runx-2及びオステオカルシンに関して分析した。これらの相対遺伝子発現レベルは、ハウスキーピング遺伝子[グリセルアルデヒド3-リン酸デヒドロゲナーゼ(GAPDH)]に正規化することによって得た。Runx-2、オステオカルシン及びGAPDHのmRNA発現レベルは、定量的リアルタイムポリメラーゼ連鎖反応(qRT-PCR)を用いて分析した。
Sr-HT/ガーナイト(20重量%)上で培養し、Sr-HT及び市販のヒドロキシアパタイト/リン酸三カルシウム(HA/TCP)スキャフォールドと比較したHOBの典型的な形態が、図6が示されている。わずか1時間後であっても、HOB細胞は、Sr-HT/ガーナイト(20重量%)表面では十分に扁平であり(図7、矢印)、スキャフォールド表面のほとんどを被覆する多くの拡大された隆起物を成長させているのが観察される。これに対して、Sr-HT及びHA/TCPは、より少ない細胞を示し、これらは1時間においてはるかに多くが収縮したままであった。24時間において、延展は、Sr-HT-20%ガーナイトに関しては高レベルに保持され、他の材料に関して観察されるよりも依然として広範であった。新たに開発したSr-HT/ガーナイト(20重量%)と比較して、実質的に低減した延展が観察された。これらの結果は、開発したスキャフォールドの生体適合性を裏付け、骨芽細胞接着の卓越した促進を示している。細胞の数及び扁平度(degree of flattening)は、Sr-HT及び商業的に使用されているHA/TCPより著しく優れているようである。
本発明の材料の生体適合性を検証するために、Sr-HT-ガーナイト(5重量%)、Sr-HT-ガーナイト(11重量%)、Sr-HT-ガーナイト(14重量%)及びSr-HT/ガーナイト(20重量%)を調製し、細胞分化の結果を、Sr-HT及びHA/TCPスキャフォールド上に播種された細胞の結果と、1時間及び24時間に関して比較した。重要な骨芽細胞分化マーカー(Runx-2及びオステオカルシン)のそれらの発現を、臨床的に使用されているHA/TCPスキャフォールド及びSr-HTスキャフォールドと比較した。Runx-2は、骨芽細胞分化における初期マスター転写因子であるのに対し、オステオカルシンは、骨芽細胞分化の後期マーカーである。結果は、Sr-HT-ガーナイト(14重量%)及びSr-HT/ガーナイト(20重量%)スキャフォールド上に播種されたHOB中における骨形成遺伝子の発現が、1日目には、HA/TCP及びSr-HTスキャフォールドと比較してRunx-2及びオステオカルシンの両者に関して著しく上方制御されていることを示した(図7を参照のこと)。これらの結果から、Sr-HT/ガーナイト(20重量%)スキャフォールドが骨芽細胞分化を活発にサポートし、インビボ骨伝導性の高い可能性を示すことがわかる。
Sr-HT/20%ガーナイトの機械的性質を、走査型電子顕微鏡観察によってさらに特性決定した。これにより、この材料の2つの相の存在が確認される。
擬似溶液中への浸漬後のセラミック材料の表面におけるアパタイト結晶の形成は、インビボ生物活性を予測する(Kokubo T.及びTakadama H、「How useful is SBF in predicting in vivo bone bioactivity?」、Biomaterials、(2006年)27、2907〜2915頁)。擬似溶液中へのSr-HT/20%ガーナイトスキャフォールド浸漬の効果について研究を行った。これは、セラミック表面にアパタイト結晶が漸次形成されることを立証し、本発明の材料の生物活性及び臨床的有用性のさらなる証拠を示している。
以前に記載された(Roohani-Esfahani S.I.ら、Biomaterials、2010年7月;31(21)5498〜509頁、2010年)ようにして、スキャフォールド構造を生成する犠牲テンプレートとして十分に網状のポリウレタンフォームを用いて、Sr-HT/20%ガーナイト又は臨床的に使用されている材料であるリン酸三カルシウム/ヒドロキシアパタイト(TCP/HA)を含む高多孔質の相互接続スキャフォールドを調製した。
TCP/HAと比較した、Sr-HT/20%ガーナイトのインビボ有効性を、ウサギ橈骨を貫いて発生した臨界サイズ欠損に、多孔質スキャフォールドを植え込むことによって評価した。このモデルにおいて、尺骨は著しい機械的なサポートを提供するが、部分的な体重負荷がスキャフォールドに伝達される。
非脱灰組織学的評価を行い、TCP/HA又はSr-HT/20%ガーナイトのいずれかを含む、橈骨欠損を架橋する骨の存在を評価した。欠損端部の近傍及びその中点において切片を採取した。骨形成を、組織形態計測によって標準的な技術を用いて、各部位において定性的に及び中点において定量的に評価した。Sr-HT/20%ガーナイトでは、欠損端部及び中点のいずれにおいても広範囲に及ぶ新骨形成が観察された。これは、欠損架橋が完全であることを示している。これに対して、TCP/HAでは新骨形成がほとんど認められなかった(図16を参照のこと)。さらに、スキャフォールド構造は、Sr-HT/20%ガーナイトでは著しく良好に保存された。これは、優れた機械的性質と一致する。Sr-HT/20%ガーナイトスキャフォールド内の髄空間(矢印を参照のこと)の出現は、骨再形成が起こっていること及び正常な皮質構造が再生されていることを示している。欠損の中点における組織形態計測による評価により、Sr-HT/20%ガーナイトで処置された欠損中の骨形成レベルがTCP/HAと比較して有意に増加していることが確認された(図17を参照のこと)。
Claims (11)
- ケイ酸ストロンチウムカルシウム亜鉛及びガーナイト(ZnAl2O4)を含む複合生体適合性セラミック材料。
- 近似分子式Sr0.1Ca1.9ZnSi2O7のケイ酸ストロンチウムカルシウム亜鉛及びガーナイトを含む、請求項1に記載の材料。
- ガーナイトの重量百分率が20%である、請求項1又は2に記載の材料。
- 前記材料の気孔率が、75〜85%である、請求項1から3のいずれか一項に記載の材料。
- 前記材料の圧縮強度が、4MPaである、請求項1から4のいずれか一項に記載の材料。
- 前記材料の弾性率が、170MPaである、請求項1から5のいずれか一項に記載の材料。
- ポリグリコリド、ポリジオキサノン、ポリヒドロキシアルカノエート、ポリラクチド、アルギネート、コラーゲン、キトサン、ポリアルキレンオキサレート、ポリ無水物、ポリ(グリコリド-co-トリメチレンカーボネート)、ポリエステルアミド及び/又はポリデプシペプチドから選択される少なくとも1種の吸収性ポリマー材料を含むコーティングを含む、請求項1から6のいずれか一項に記載の材料。
- 請求項1から7のいずれか一項に記載の材料を含む、植込み型医療機器、骨インプラント、歯の詰め物又はバイオセメント又は植込み型薬物送達装置。
- 複合生体適合性セラミック材料を調製するための方法であって、
ゾル-ゲル法によって、ストロンチウムがドープされたケイ酸カルシウム亜鉛粉末を生成するステップと、
回転ボールミル機によって、前記のストロンチウムがドープされたケイ酸カルシウム亜鉛粉末をアルミナ粉末と混合し、機械的に活性化させるステップと、
得られた粉末を乾燥及び焼結して、前記複合生体適合性セラミック材料を形成するステップと
を含む、方法。 - 複合生体適合性セラミック材料を調製するための組成物であって、アルミナと、ストロンチウムがドープされたハーディストナイト[SrxCa(2-x)ZnSi2O7](式中、xは0.05〜0.9である)の形態のSrがドープされたケイ酸カルシウム亜鉛とを含む、組成物。
- アルミナの量が、15重量%である、請求項10に記載の組成物。
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| CN107149698B (zh) * | 2011-06-01 | 2021-01-15 | 阿莱格拉骨科有限公司 | 生物相容的材料及其用途 |
| WO2014183148A1 (en) * | 2013-05-14 | 2014-11-20 | The University Of Sydney | A bioactive material and method of forming same |
| US9238090B1 (en) | 2014-12-24 | 2016-01-19 | Fettech, Llc | Tissue-based compositions |
| DE102015115958A1 (de) * | 2015-09-22 | 2017-03-23 | Schott Ag | Medizinisches Glaselement |
| JP6864360B2 (ja) * | 2016-10-29 | 2021-04-28 | 公立大学法人奈良県立医科大学 | ケイ酸ストロンチウムアパタイトおよびこれを含む細胞培養基材と生体活性インプラント |
| WO2019065285A1 (ja) * | 2017-09-29 | 2019-04-04 | 学校法人神奈川大学 | メリライト型複合酸化物 |
| CN107746268B (zh) * | 2017-11-07 | 2020-09-01 | 聊城大学 | 一种锌黄长石/硅酸钙复合生物陶瓷材料及其制备方法 |
| US11857558B2 (en) * | 2018-09-14 | 2024-01-02 | Angelus Indústria De Produtos Odontológicos S/a | Dental and medical compositions having a multiple source of metallic ions |
| CN110051439A (zh) * | 2019-04-29 | 2019-07-26 | 隋君 | Picc置管长度测量方法 |
| CN112043868A (zh) * | 2019-06-05 | 2020-12-08 | 中国科学院金属研究所 | 具有微观定向结构的义齿用陶瓷/树脂复合材料及其制备方法 |
| CN111205080B (zh) * | 2020-01-19 | 2022-04-29 | 武汉工程大学 | 一种高强度铝酸锌多孔陶瓷及其制备方法 |
| CN113061022A (zh) * | 2021-02-19 | 2021-07-02 | 南京航空航天大学 | 一种基于原位法制备硅酸钙/氧化镁多孔生物骨支架的方法 |
| CN112745142B (zh) * | 2021-03-04 | 2022-07-19 | 四川大学 | 具有抗菌功能的石墨烯/磷酸钙陶瓷复合支架及制备方法 |
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