J Endod:临床分离粪肠球菌的胞外物质和生物膜形成之间的联系对次氯酸钠的反应

2017-12-07 lishiting MedSci原创

粪肠球菌的胞外物质(ECM)可能对增加环境压力的抵抗力具有重要作用。这篇研究的目的是为了确定粪肠球菌在应对次氯酸钠亚最小抑制浓度(sub-MIC/NaOCl) 或厌氧生长时,ECM水平变化以及对生物膜发育的影响。

粪肠球菌的胞外物质(ECM)可能对增加环境压力的抵抗力具有重要作用。这篇研究的目的是为了确定粪肠球菌在应对次氯酸钠亚最小抑制浓度(sub-MIC/NaOCl) 或厌氧生长时,ECM水平变化以及对生物膜发育的影响。研究在37株临床分离的粪肠球菌中按照它们产生生物膜的能力,通过结晶紫生物膜测定法选出19株:10株较强, 4株中等以及5株未产生生物膜。随后,对所有菌株施加sub-MIC/NaOCl刺激后,进行生物膜检测。在施加sub-MIC/NaOCl以及有氧或厌氧条件下,检测所有菌株的ECM情况。使用扫面电镜检测ECM产物情况。通过双盲独立评估法计算ECM产物水平。使用聚合酶链式反应检测esp基因的表达情况。使用托德-休伊特和明胶琼脂检测明胶酶活性。结果显示,在有氧条件下,ECM表达于所有菌株中。施加sub-MIC/NaOCl后,在10株具有较强产生生物膜的菌株中,有5株可以增强他们的ECM产物,有4株可以增强生物膜生长。有2株ECM产物降低并且生物膜生长减少。有1株未发生任何变化。大部分未产生生物膜的菌株其ECM产物未观察到明显变化,尽管有1株可以增加生物膜生长。而ECM产物在厌氧环境下

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