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2013 ; 13
(6
): 759-72
Nephropedia Template TP
gab.com Text
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English Wikipedia
A secreted bacterial protease tailors the Staphylococcus aureus virulence
repertoire to modulate bone remodeling during osteomyelitis
#MMPMID23768499
Cassat JE
; Hammer ND
; Campbell JP
; Benson MA
; Perrien DS
; Mrak LN
; Smeltzer MS
; Torres VJ
; Skaar EP
Cell Host Microbe
2013[Jun]; 13
(6
): 759-72
PMID23768499
show ga
Osteomyelitis is a common manifestation of invasive Staphylococcus aureus
infection. Pathogen-induced bone destruction limits antimicrobial penetration to
the infectious focus and compromises treatment of osteomyelitis. To investigate
mechanisms of S. aureus-induced bone destruction, we developed a murine model of
osteomyelitis. Microcomputed tomography of infected femurs revealed that
S. aureus triggers profound alterations in bone turnover. The bacterial
regulatory locus sae was found to be critical for osteomyelitis pathogenesis, as
Sae-regulated factors promote pathologic bone remodeling and intraosseous
bacterial survival. Exoproteome analyses revealed the Sae-regulated protease
aureolysin as a major determinant of the S. aureus secretome and identified the
phenol-soluble modulins as aureolysin-degraded, osteolytic peptides that trigger
osteoblast cell death and bone destruction. These studies establish a murine
model for pathogen-induced bone remodeling, define Sae as critical for
osteomyelitis pathogenesis, and identify protease-dependent exoproteome
remodeling as a major determinant of the staphylococcal virulence repertoire.