Stability of prostaglandin E2 (PGE2) embedded in poly-d,l-lactide-co-glycolide microspheres: a pre-conditioning approach for tissue engineering applications

Stability of prostaglandin E2 (PGE2) embedded in poly-d,l-lactide-co-glycolide microspheres: a pre-conditioning approach for tissue engineering applications
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嵌入聚-d,l-丙交酯-乙交酯微球中的前列腺素 E2 (PGE2) 的稳定性:组织工程应用的预处理方法

DOI:
10.1007/s10856-008-3678-9
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发表时间:
2009
期刊:
Journal of Materials Science: Materials in Medicine
影响因子:
--
通讯作者:
Brochhausen C.
Brochhausen C.
中科院分区:
--
文献类型:
--
作者:
Watzer B;Zehbe R;Halstenberg S;Kirkpatrick C.J;Brochhausen C.

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前列腺素E2(PGE2)参与血管生成、骨修复和软骨代谢。因此,pge2可能在不同的组织工程应用中代表一个合适的信号分子。pge2的半衰期也很短。其掺入聚d,l-丙交酯-共聚物(PLGA)微球已在先前的研究中得到证实。然而,生物活性pge2在这些微球中的稳定性尚不清楚。通过调整质谱分析,我们研究了pge2的掺入量和pge2在常规细胞培养基和PLGA微球中的稳定性。pge2的稳定性与pH密切相关。强酸性或碱性环境将半衰期从300小时(pH 2.6-4.0)降低到pH 2.0或pH 8.8时的50小时以下。pge2掺入聚d -l -丙交酯-共聚物的半衰期急剧增加,在37℃时达到70天,在8℃时达到300天。扫描电子显微镜(SEM)和原子力显微镜(AFM)分析表明,聚合物相具有明显的纳米结构,并且具有纳米和微孔隙度。
Prostaglandin E2(PGE2) is involved in angiogenesis, bone repair and cartilage metabolism. Thus, PGE2might represent a suitable signaling molecule in different tissue engineering applications. PGE2also has a short half-life time. Its incorporation into poly-d,l-lactide-co-glycolide (PLGA) microspheres was demonstrated in a previous study. However, the stability of bioactive PGE2in these microspheres is unknown. With an adjusted mass spectrometry assay we investigated the amount of incorporated PGE2and the stability of PGE2in conventional cell culture medium and in PLGA microspheres. The stability of PGE2was closely pH dependent. Strong acidic or basic environments reduced the half-life from 300 h (pH 2.6–4.0) to below 50 h at pH 2.0 or pH 8.8. The half-life of PGE2incorporated into poly-d,l-lactide-co-glycolide increased drastically to 70 days at 37°C and to 300 days at 8°C. Analysis with scanning electron microscopy (SEM) and atomic force microscopy (AFM) demonstrated a distinct nanostructure of the polymeric phase and both nano- and microporosity.
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