J Endod:人冻干牙本质基质可作为牙组织工程中的生物活性支架材料

2019-10-07 lishiting MedSci原创

牙本质是牙组织工程中适宜的支架材料,并且能为调节牙源性细胞提供适当浓度的生物活性蛋白成分。冻干是处理牙本质的一种可行策略,因其能够长效保持生物药剂产品以及牙本质的稳定,进而改善分布和存储。因此,作者认为:冻干牙本质基质(FDDM)能够为牙组织再生组成一种全新的生物结构支架。

牙本质是牙组织工程中适宜的支架材料,并且能为调节牙源性细胞提供适当浓度的生物活性蛋白成分。冻干是处理牙本质的一种可行策略,因其能够长效保持生物药剂产品以及牙本质的稳定,进而改善分布和存储。因此,作者认为:冻干牙本质基质(FDDM)能够为牙组织再生组成一种全新的生物结构支架。


研究采用一种改良技术制备FDDM以保存牙本质的机械和生物特性。检测FDDM的抗压能力以及显微硬度。同时,检测其不同的生物特征,包括:细胞形态、细胞增殖、胶原分泌、碱性磷酸酶活性以及基因和蛋白表达。为了评估FDDM的体内诱导活性,将FDDM和人牙髓干细胞(DPSC)膜片同时植入裸鼠背部皮下。移植8周后,取出移植物并进行组织学观察和分析。


结果显示,FDDM的机械性能和生物学特点与牙本质相似(P > .05)。与培养于a-MEM或羟基磷灰石的DPSCs相比,培养于FDDM和牙本质上的DPSCs表现出极佳的细胞粘附、生长、活性和胶原分泌能力,但矿化能力减弱(P < .05)。组织学结果显示,FDDM与牙本质相似,支持体内牙本质/牙髓的组织再生,同时相关牙本质标志物表达水平上调,如:牙本质涎蛋白和碱性磷酸酶。


结论:这些结果表明,FDDM为牙组织再生构成了一种极佳的支架材料。


原始出处:


Wang F, Xie C, et al. Human Freeze-dried Dentin Matrix as a Biologically Active Scaffold for Tooth Tissue Engineering. J Endod. 2019 Sep 26. pii: S0099-2399(19)30589-8. doi: 10.1016/j.joen.2019.08.006.


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    2019-10-08 1209e435m98(暂无昵称)

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为了促进组织工程骨的血管化,将IFN-γ极化巨噬细胞至M1加载到5%硅酸钙/β-磷酸三钙(CaSiO3-β-TCP)支架上。从支架释放的IFN-γ和Si分别使M1和M2巨噬细胞极化。 制备β-TCP、CaSiO3-β-TCP和IFN-γ@ CaSiO3-β-TCP,并评估其生物相容性。流式细胞术检测巨噬细胞的极化。培养人类脐静脉内皮细胞,并在从与负载巨噬细胞支架培养基中提取的诱导基质胶条件培养中诱