Inhaled Nitric Oxide Protects Males but Not Females from Neonatal Mouse Hypoxia-ischemia Brain Injury

Overview

Journal Transl Stroke Res

Publisher Springer

Date 2013 Dec 11

PMID 24323275

Citations 16

Authors

Changlian Zhu

Yanyan Sun

Jianfeng Gao

Xiaoyang Wang

Nikolaus Plesnila

Klas Blomgren

Affiliations

Soon will be listed here.

Abstract

It was recently discovered that while under normal conditions inhaled nitric oxide (iNO) does not affect cerebral blood flow, it selectively dilates arterioles in the ischemic penumbra during experimental cerebral ischemia, thereby increasing collateral blood flow and reducing ischemic brain damage. The mechanism was verified in multiple models, but only in male animals. Our aim was to evaluate the effects of iNO on brain injury in neonatal males and females. Nine-day-old mice were subjected to unilateral hypoxia-ischemia (HI), using 10% oxygen balanced with nitrogen, with or without 50 ppm NO. Brain injury 72 h after HI was reduced by iNO as judged by percentage of injury (-21.7%), atrophy (-23.7%), and total pathological score (-29%). The injury was significantly reduced in males (-32.4%, p<0.05) but not in females (-7.1%, n.s.). Neither the numbers nor the proliferation rates of neural stem cells in the dentate gyrus were affected by iNO. In summary, intraischemic iNO reduced neonatal HI brain injury in a gender-related manner.

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