Warning: file_get_contents(https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&id=28947649
&cmd=llinks): Failed to open stream: HTTP request failed! HTTP/1.1 429 Too Many Requests
in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 215
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\28947649
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Infect+Immun
2017 ; 85
(12
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Modulation of Neutrophil Extracellular Trap and Reactive Oxygen Species Release
by Periodontal Bacteria
#MMPMID28947649
Hirschfeld J
; White PC
; Milward MR
; Cooper PR
; Chapple ILC
Infect Immun
2017[Dec]; 85
(12
): ä PMID28947649
show ga
Oral bacteria are the main trigger for the development of periodontitis, and some
species are known to modulate neutrophil function. This study aimed to explore
the release of neutrophil extracellular traps (NETs), associated antimicrobial
proteins, and reactive oxygen species (ROS) in response to periodontal bacteria,
as well as the underlying pathways. Isolated peripheral blood neutrophils were
stimulated with 19 periodontal bacteria. NET and ROS release, as well as the
expression of NET-bound antimicrobial proteins, elastase, myeloperoxidase, and
cathepsin G, in response to these species was measured using fluorescence-based
assays. NET and ROS release was monitored after the addition of NADP (NADPH)
oxidase pathway modulators and inhibitors of Toll-like receptors (TLRs).
Moreover, bacterial entrapment by NETs was visualized microscopically, and
bacterial killing was assessed by bacterial culture. Certain microorganisms,
e.g., Veillonella parvula and Streptococcus gordonii, stimulated higher levels of
ROS and NET release than others. NETs were found to entrap, but not kill, all
periodontal bacteria tested. NADPH oxidase pathway modulators decreased ROS
production but not NET production in response to the bacteria. Interestingly, TLR
inhibitors did not impact ROS and NET release. These data suggest that the
variability in the neutrophil response toward different bacteria may contribute
to the pathogenesis of periodontal diseases by mechanisms such as bacterial
avoidance of host responses and activation of neutrophils. Moreover, our results
indicate that bacterium-stimulated NET release may arise in part via NADPH
oxidase-independent mechanisms. The role of TLR signaling in bacterium-induced
ROS and NET release needs to be further elucidated.