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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
2016 ; 84
(1
): 11-20
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Brucella abortus Invasion of Osteocytes Modulates Connexin 43 and Integrin
Expression and Induces Osteoclastogenesis via Receptor Activator of NF-?B Ligand
and Tumor Necrosis Factor Alpha Secretion
#MMPMID26459511
Pesce Viglietti AI
; Arriola Benitez PC
; Gentilini MV
; Velásquez LN
; Fossati CA
; Giambartolomei GH
; Delpino MV
Infect Immun
2016[Jan]; 84
(1
): 11-20
PMID26459511
show ga
Osteoarticular brucellosis is the most common localization of human active
disease. Osteocytes are the most abundant cells of bone. They secrete factors
that regulate the differentiation of both osteoblasts and osteoclasts during bone
remodeling. The aim of this study is to determine if Brucella abortus infection
modifies osteocyte function. Our results indicate that B. abortus infection
induced matrix metalloproteinase 2 (MMP-2), receptor activator for NF-?B ligand
(RANKL), proinflammatory cytokines, and keratinocyte chemoattractant (KC)
secretion by osteocytes. In addition, supernatants from B. abortus-infected
osteocytes induced bone marrow-derived monocytes (BMM) to undergo
osteoclastogenesis. Using neutralizing antibodies against tumor necrosis factor
alpha (TNF-?) or osteoprotegerin (OPG), RANKL's decoy receptor, we determined
that TNF-? and RANKL are involved in osteoclastogenesis induced by supernatants
from B. abortus-infected osteocytes. Connexin 43 (Cx43) and the integrins
E11/gp38, integrin-?, integrin-?, and CD44 are involved in cell-cell interactions
necessary for osteocyte survival. B. abortus infection inhibited the expression
of Cx43 but did not modify the expression of integrins. Yet the expression of
both Cx43 and integrins was inhibited by supernatants from B. abortus-infected
macrophages. B. abortus infection was not capable of inducing osteocyte
apoptosis. However, supernatants from B. abortus-infected macrophages induced
osteocyte apoptosis in a dose-dependent manner. Taken together, our results
indicate that B. abortus infection could alter osteocyte function, contributing
to bone damage.