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SOD2 activity is not impacted by hyperoxia in murine neonatal pulmonary artery smooth muscle cells and mice.

Abstract：

:Pulmonary hypertension (PH) complicates bronchopulmonary dysplasia (BPD) in 25% of infants. Superoxide dismutase 2 (SOD2) is an endogenous mitochondrial antioxidant, and overexpression protects against acute lung injury in adult mice. Little is known about SOD2 in neonatal lung disease and PH. C57Bl/6 mice and isogenic SOD2+/+ and SOD2-/+ mice were placed in room air (control) or 75% O2 (chronic hyperoxia, CH) for 14 days. Right ventricular hypertrophy (RVH) was assessed by Fulton's index. Medial wall thickness (MWT) and alveolar area were assessed on formalin fixed lung sections. Pulmonary artery smooth muscle cells (PASMC) were placed in 21% or 95% O2 for 24 h. Lung and PASMC protein were analyzed for SOD2 expression and activity. Oxidative stress was measured with a mitochondrially-targeted sensor, mitoRoGFP. CH lungs have increased SOD2 expression, but unchanged activity. SOD2-/+ PASMC have decreased expression and activity at baseline, but increased SOD2 expression in hyperoxia. Hyperoxia increased mitochondrial ROS in SOD2+/+ and SOD2-/+ PASMC. SOD2+/+ and SOD2-/+ CH pups induced SOD2 expression, but not activity, and developed equivalent increases in RVH, MWT, and alveolar area. Since SOD2-/+ mice develop equivalent disease, this suggests other antioxidant systems may compensate for partial SOD2 expression and activity in the neonatal period during hyperoxia-induced oxidative stress.

journal_name

Int J Mol Sci

journal_title

International journal of molecular sciences

authors

Gupta A,Perez M,Lee KJ,Taylor JM,Farrow KN

doi

10.3390/ijms16036373

subject

Has Abstract

pub_date

2015-03-19 00:00:00

pages

6373-90

issue

3

issn

1422-0067

pii

ijms16036373

journal_volume

16

pub_type

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