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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 Am+J+Physiol+Lung+Cell+Mol+Physiol
2014 ; 306
(12
): L1090-103
Nephropedia Template TP
Yamaji-Kegan K
; Takimoto E
; Zhang A
; Weiner NC
; Meuchel LW
; Berger AE
; Cheadle C
; Johns RA
Am J Physiol Lung Cell Mol Physiol
2014[Jun]; 306
(12
): L1090-103
PMID24793164
show ga
Pulmonary hypertension (PH) is characterized by elevated pulmonary artery
pressure that leads to progressive right heart failure and ultimately death.
Injury to endothelium and consequent wound repair cascades have been suggested to
trigger pulmonary vascular remodeling, such as that observed during PH. The
relationship between injury to endothelium and disease pathogenesis in this
disorder remains poorly understood. We and others have shown that, in mice,
hypoxia-induced mitogenic factor (HIMF, also known as FIZZ1 or RELM?) plays a
critical role in the pathogenesis of lung inflammation and the development of PH.
In this study, we dissected the mechanism by which HIMF and its human homolog
resistin (hRETN) induce pulmonary endothelial cell (EC) apoptosis and subsequent
lung inflammation-mediated PH, which exhibits many of the hallmarks of the human
disease. Systemic administration of HIMF caused increases in EC apoptosis and
interleukin (IL)-4-dependent vascular inflammatory marker expression in mouse
lung during the early inflammation phase. In vitro, HIMF, hRETN, and IL-4
activated pulmonary microvascular ECs (PMVECs) by increasing angiopoietin-2
expression and induced PMVEC apoptosis. In addition, the conditioned medium from
hRETN-treated ECs had elevated levels of endothelin-1 and caused significant
increases in pulmonary vascular smooth muscle cell proliferation. Last, HIMF
treatment caused development of PH that was characterized by pulmonary vascular
remodeling and right heart failure in wild-type mice but not in IL-4 knockout
mice. These data suggest that HIMF contributes to activation of vascular
inflammation at least in part by inducing EC apoptosis in the lung. These events
lead to subsequent PH.