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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Infect+Immun
2014 ; 82
(12
): 4921-30
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Bacterial lysis liberates the neutrophil migration suppressor YbcL from the
periplasm of uropathogenic Escherichia coli
#MMPMID25183735
Lau ME
; Danka ES
; Tiemann KM
; Hunstad DA
Infect Immun
2014[Dec]; 82
(12
): 4921-30
PMID25183735
show ga
Uropathogenic Escherichia coli (UPEC) modulates aspects of the innate immune
response during urinary tract infection to facilitate bacterial invasion of the
bladder epithelium, a requirement for the propagation of infection. For example,
UPEC-encoded YbcL suppresses the traversal of bladder epithelia by neutrophils in
both an in vitro model and an in vivo murine cystitis model. The suppressive
activity of YbcL requires liberation from the bacterial periplasm, though the
mechanism of release is undefined. Here we present findings on the site of action
of YbcL and demonstrate a novel mode of secretion for a UPEC exoprotein.
Suppression of neutrophil migration by purified YbcL(UTI), encoded by cystitis
isolate UTI89, required the presence of a uroepithelial layer; YbcL(UTI) did not
inhibit neutrophil chemotaxis directly. YbcL(UTI) was released to a greater
extent during UPEC infection of uroepithelial cells than during that of
neutrophils. Release of YbcL(UTI) was maximal when UPEC and bladder epithelial
cells were in close proximity. Established modes of secretion, including outer
membrane vesicles, the type II secretion system, and the type IV pilus, were
dispensable for YbcL(UTI) release from UPEC. Instead, YbcL(UTI) was liberated
during bacterial death, which was augmented upon exposure to bladder epithelial
cells, as confirmed by detection of bacterial cytoplasmic proteins and DNA in the
supernatant and enumeration of bacteria with compromised membranes. As YbcL(UTI)
acts on the uroepithelium to attenuate neutrophil migration, this mode of release
may represent a type of altruistic cooperation within a UPEC population during
colonization of the urinary tract.