Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 245.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 245.2 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\23105142
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Immunol
2012 ; 189
(11
): 5411-20
Nephropedia Template TP
Reddy AT
; Lakshmi SP
; Kleinhenz JM
; Sutliff RL
; Hart CM
; Reddy RC
J Immunol
2012[Dec]; 189
(11
): 5411-20
PMID23105142
show ga
Bacterial endotoxin (LPS)-mediated sepsis involves severe, dysregulated
inflammation that injures the lungs and other organs, often fatally. Vascular
endothelial cells are both key mediators and targets of LPS-induced inflammatory
responses. The nuclear hormone receptor peroxisome proliferator-activated
receptor ? (PPAR?) exerts anti-inflammatory actions in various cells, but it is
unknown whether it modulates inflammation through actions within endothelial
cells. To determine whether PPAR? acts within endothelial cells to diminish
endotoxemic lung inflammation and injury, we measured inflammatory responses and
mediators in mice with endothelial-targeted deletion of PPAR?. Endothelial cell
PPAR? (ePPAR?) knockout exacerbated LPS-induced pulmonary inflammation and injury
as shown by several measures, including infiltration of inflammatory cells,
edema, and production of reactive oxygen species and proinflammatory cytokines,
along with upregulation of the LPS receptor TLR4 in lung tissue and increased
activation of its downstream signaling pathways. In isolated LPS-stimulated
endothelial cells in vitro, absence of PPAR? enhanced the production of numerous
inflammatory markers. We hypothesized that the observed in vivo activity of the
ligand-activated ePPAR? may arise, in part, from nitrated fatty acids (NFAs), a
novel class of endogenous PPAR? ligands. Supporting this idea, we found that
treating isolated endothelial cells with physiologically relevant concentrations
of the endogenous NFA 10-nitro-oleate reduced LPS-induced expression of a wide
range of inflammatory markers in the presence of PPAR?, but not in its absence,
and also inhibited neutrophil mobility in a PPAR?-dependent manner. Our results
demonstrate a key protective role of ePPAR? against endotoxemic injury and a
potential ePPAR?-mediated anti-inflammatory role for NFAs.