Biomaterials:生物材料表面通过接触转移抗微生物剂来防御细菌

2019-03-21 不详 网络

尽管对组织接触生物医学装置可促进组织愈合,但这些装置仍然易受细菌定植,生物膜形成和慢性感染的影响。选择抗性基因的威胁在很大程度上排除了持续的抗菌洗脱作为广泛的临床解决方案。为此,研究人员开发出改良表面的材料,其中抗菌剂仅在存在细菌挑战时释放。本研究中,我们探索了一种新的自我防御方法,使用阴离子微凝胶,通过络合加载小分子阳离子抗菌剂。我们确定了在微凝胶内隔离抗菌药物长达数周的条件。然而,细菌接触会触

尽管对组织接触生物医学装置可促进组织愈合,但这些装置仍然易受细菌定植,生物膜形成和慢性感染的影响。选择抗性基因的威胁在很大程度上排除了持续的抗菌洗脱作为广泛的临床解决方案。为此,研究人员开发出改良表面的材料,其中抗菌剂仅在存在细菌挑战时释放。本研究中,我们探索了一种新的自我防御方法,使用阴离子微凝胶,通过络合加载小分子阳离子抗菌剂。

我们确定了在微凝胶内隔离抗菌药物长达数周的条件。然而,细菌接触会触发释放并导致局部细菌杀死。我们推测,细菌的紧密接近会改变局部热力学环境,并干扰微凝胶-抗菌复合物。接触转移方法不需要细菌代谢,而是由微凝胶和细菌细胞包膜之间的差异驱动,其中存在高浓度的负电荷和疏水性。然而,与代谢巨噬细胞或成骨细胞的接触不足以引发抗微生物释放,表明接触转移可以特异于细菌并且表明生物医学装置表面的途径可以同时促进愈合和抵抗感染

原始出处:

Liang J, Wang H, Libera M. Biomaterial surfaces self-defensive against bacteria by contact transfer of antimicrobials. Biomaterials. 2019 Mar 8;204:25-35. doi: 10.1016/j.biomaterials.2019.03.006.

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    2019-05-26 sunylz
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