CRhvKP的形成是持续进化以及携带碳青霉烯耐药基因或高毒力基因的质粒交换的结果。有三种机制解释了碳青霉烯耐药性和高毒力表型的同时进化:(1)碳青霉烯耐药基因可以通过质粒水平转移到高毒力肺炎克雷伯菌中;(2)含有高毒力编码基因的毒力质粒可以转移到耐碳 ...
在微生物的世界里,细菌就像一群不断 “升级打怪” 的小怪兽,持续进化着。自大约 35 亿年前诞生以来,细菌依据达尔文进化论不断演变,与人类展开了一场漫长的 “战争”。致病性和机会性细菌的进化,如获得毒力因子、毒素以及基因突变增强等,严重影响着人类健康。其中,抗菌耐药性(AMR)的出现更是成为全球关注的重大问题,由于获得 AMR 基因和耐药基因突变,细菌变得越来越 “强大”,难以被现有抗菌药物制服。
肺炎克雷伯菌能成为 “致病高手”,靠的是巧妙避开宿主防御机制的策略。它的主要毒力因子是位于外膜的厚厚的多糖荚膜,这层 “护盾” 能保护细菌免受吞噬细胞的吞噬和血清补体因子的攻击,还能抑制宿主的强烈免疫反应,阻挡抗菌肽的活性。此外,脂多糖(LPS)、菌毛(帮助细菌黏附到不同表面)、铁载体(确保细菌获得宿主中有限的铁离子)以及膜转运蛋白(实现选择性的物质交换)等也是重要的毒力因子。
Thomas A. Russo, MD, SUNY Distinguished Professor and chief of infectious diseases at the Jacobs School, is co-author on a Nature Communications paper analyzing hypervirulent pneumoniae infections.
Klebsiella pneumoniae is a common species of bacteria found in our bodies—and may even be lurking in your gut, mouth or nose right now. But it's also a notoriously harmful bacteria that can make ...
GSK (GSK) plc announced that the U.S. Food and Drug Administration has approved Blujepa for the treatment of female adults and pediatric ...
Klebsiella pneumoniae was the most dangerous of them all.The bacterium can cause very serious infections - including pneumonia, meningitis, sepsis, and skin infections. It is one of the main ...