Killed but metabolically active Salmonella typhimurium: application of a new technology to an old vector.

Killed but metabolically active Salmonella typhimurium: application of a new technology to an old vector.
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被杀死但代谢活跃的鼠伤寒沙门氏菌:新技术在旧载体上的应用。

DOI:
10.1086/512618
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发表时间:
2007
期刊:
The Journal of infectious diseases
影响因子:
--
通讯作者:
Hohmann,ElizabethL
Hohmann,ElizabethL
中科院分区:
--
文献类型:
--
作者:
Lankowski,AlexanderJ;Hohmann,ElizabethL

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以前的研究表明,减毒沙门氏菌作为疫苗载体产生强烈的免疫反应,然而,平衡免疫原性与反应原性仍然存在问题。最近在其他细菌中的研究表明,DNA切除修复突变体(ΔuvrAB)的光化学处理使生物体“被杀死但代谢活跃”(KBMA)。在此,我们将这一概念扩展到鼠伤寒沙门氏菌。先前在人类志愿者中评估的鼠伤寒沙门氏菌进一步删除了uvrAB基因并命名为CKS362。光化学处理导致CKS362显著失活。这些KBMA微生物具有代谢活性,如放射性蛋氨酸掺入和乳酸脱氢酶活性所示。在腹腔内接种的小鼠中,KBMA CKS362的反应原性明显降低,并刺激相当于其活对应物的体液免疫。由于亲本菌株先前已被发现能引起对沙门氏菌抗原的强烈免疫应答,因此我们建议将CKS362作为原型菌株来测试KBMA生物体在人体中的免疫原性。
Previous studies have shown that attenuated salmonellae utilized as vaccine vectors engender strong immune responses; however, balancing immunogenicity with reactogenicity remains problematic. Recent work in other bacteria has shown that photochemical treatment of DNA excision repair mutants (ΔuvrAB) renders organisms “killed but metabolically active” (KBMA). Here, we extend this concept toSalmonella typhimurium.A strain of attenuatedS. typhimuriumpreviously evaluated in human volunteers was further deleted foruvrABgenes and designated CKS362. Photochemical treatment of CKS362 resulted in significant inactivation. These KBMA organisms were metabolically active as shown by radioactive methionine incorporation and lactate dehydrogenase activity. In mice inoculated intraperitoneally, KBMA CKS362 was markedly less reactogenic and stimulated a humoral immune equivalent to its live counterpart. Because the parental strain has previously been found to elicit strong immune responses toSalmonellaantigens, we propose CKS362 as a prototype strain to test the immunogenicity of KBMA organisms in humans.
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