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2018 ; 7
(3
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Redistribution of Extracellular Superoxide Dismutase Causes Neonatal Pulmonary
Vascular Remodeling and PH but Protects Against Experimental Bronchopulmonary
Dysplasia
#MMPMID29538340
Sherlock LG
; Trumpie A
; Hernandez-Lagunas L
; McKenna S
; Fisher S
; Bowler R
; Wright CJ
; Delaney C
; Nozik-Grayck E
Antioxidants (Basel)
2018[Mar]; 7
(3
): ä PMID29538340
show ga
BACKGROUND: A naturally occurring single nucleotide polymorphism (SNP),
(R(213)G), in extracellular superoxide dismutase (SOD3), decreases SOD3 matrix
binding affinity. Humans and mature mice expressing the R(213)G SNP exhibit
increased cardiovascular disease but decreased lung disease. The impact of this
SNP on the neonatal lung at baseline or with injury is unknown. METHODS: Wild
type and homozygous R(213)G mice were injected with intraperitoneal bleomycin or
phosphate buffered saline (PBS) three times weekly for three weeks and tissue
harvested at 22 days of life. Vascular and alveolar development were evaluated by
morphometric analysis and immunostaining of lung sections. Pulmonary hypertension
(PH) was assessed by right ventricular hypertrophy (RVH). Lung protein expression
for superoxide dismutase (SOD) isoforms, catalase, vascular endothelial growth
factor receptor 2 (VEGFR2), endothelial nitric oxide synthase (eNOS) and
guanosine triphosphate cyclohydrolase-1 (GTPCH-1) was evaluated by western blot.
SOD activity and SOD3 expression were measured in serum. RESULTS: In R(213)G
mice, SOD3 lung protein expression decreased, serum SOD3 protein expression and
SOD serum activity increased compared to wild type (WT) mice. Under control
conditions, R(213)G mice developed pulmonary vascular remodeling (decreased
vessel density and increased medial wall thickness) and PH; alveolar development
was similar between strains. After bleomycin injury, in contrast to WT, R(213)G
mice were protected from impaired alveolar development and their vascular
abnormalities and PH did not worsen. Bleomycin decreased VEGFR2 and GTPCH-1 only
in WT mice. CONCLUSION: R(213)G neonatal mice demonstrate impaired vascular
development and PH at baseline without alveolar simplification, yet are protected
from bleomycin induced lung injury and worsening of pulmonary vascular remodeling
and PH. These results show that vessel bound SOD3 is essential in normal
pulmonary vascular development, and increased serum SOD3 expression and SOD
activity prevent lung injury in experimental bronchopulmonary dysplasia (BPD) and
PH.