کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4359622 1300530 2007 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of capsule and extended-spectrum beta-lactamases encoding plasmids upon Klebsiella pneumoniae adhesion
موضوعات مرتبط
علوم زیستی و بیوفناوری ایمنی شناسی و میکروب شناسی میکروبیولوژی و بیوتکنولوژی کاربردی
پیش نمایش صفحه اول مقاله
Influence of capsule and extended-spectrum beta-lactamases encoding plasmids upon Klebsiella pneumoniae adhesion
چکیده انگلیسی

Interaction with cells is believed to be a crucial step in the process of colonization by Klebsiella pneumoniae. In this study, we investigated the adhesion properties of 17 extended-spectrum beta-lactamases (ESBLs) producing clinical isolates using 2 intestinal cells (Int-407 and HT-29 cells) and components of the extracellular matrix (ECM) (fibrinogen, collagen, fibronectin). Since the capsule formed by K. pneumoniae potentially masks bacterial cell surface components, we created mutants defective in capsular synthesis. The levels of adhesion of the acapsulated mutants were higher than their corresponding wild-type strains for 7 and 4 isolates with Int-407 and HT-29 cells, respectively, whereas 2 mutants displayed lower adhesion indexes with HT-29 cells. Nine mutants adhered at higher levels than their corresponding wild-type strains to all 3 components of ECM tested and 13 only to collagen. Transfer by mating of ESBL-encoding plasmids did not correlate with the acquisition of adhesive properties by the transconjugants, which suggests that these plasmids were not involved in adhesion expression. The presence of ESBL-encoding plasmids alters the basal adhesion capacity of the recipient strain, and cured strains adhered more than the parental strains. The possessing of capsule or plasmid-encoded factors would have a bacterial cost, including a weaker capacity for adhesion.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Research in Microbiology - Volume 158, Issue 4, May 2007, Pages 339–347
نویسندگان
, ,