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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 Front+Physiol
2018 ; 9
(ä): 138
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Vascular Endothelial Cell-Specific Connective Tissue Growth Factor (CTGF) Is
Necessary for Development of Chronic Hypoxia-Induced Pulmonary Hypertension
#MMPMID29535639
Pi L
; Fu C
; Lu Y
; Zhou J
; Jorgensen M
; Shenoy V
; Lipson KE
; Scott EW
; Bryant AJ
Front Physiol
2018[]; 9
(ä): 138
PMID29535639
show ga
Chronic hypoxia frequently complicates the care of patients with interstitial
lung disease, contributing to the development of pulmonary hypertension (PH), and
premature death. Connective tissue growth factor (CTGF), a matricellular protein
of the Cyr61/CTGF/Nov (CCN) family, is known to exacerbate vascular remodeling
within the lung. We have previously demonstrated that vascular endothelial-cell
specific down-regulation of CTGF is associated with protection against the
development of PH associated with hypoxia, though the mechanism for this effect
is unknown. In this study, we generated a transgenic mouse line in which the Ctgf
gene was floxed and deleted in vascular endothelial cells that expressed Cre
recombinase under the control of VE-Cadherin promoter (eCTGF KO mice). Lack of
vascular endothelial-derived CTGF protected against the development of PH
secondary to chronic hypoxia, as well as in another model of bleomycin-induced
pulmonary hypertension. Importantly, attenuation of PH was associated with a
decrease in infiltrating inflammatory cells expressing CD11b or integrin ?(M)
(ITGAM), a known adhesion receptor for CTGF, in the lungs of hypoxia-exposed
eCTGF KO mice. Moreover, these pathological changes were associated with
activation of-Rho GTPase family member-cell division control protein 42 homolog
(Cdc42) signaling, known to be associated with alteration in endothelial barrier
function. These data indicate that endothelial-specific deletion of CTGF results
in protection against development of chronic-hypoxia induced PH. This protection
is conferred by both a decrease in inflammatory cell recruitment to the lung, and
a reduction in lung Cdc42 activity. Based on our studies, CTGF inhibitor
treatment should be investigated in patients with PH associated with chronic
hypoxia secondary to chronic lung disease.