title: Inhaled nitric oxide protects males but not females from neonatal mouse hypoxia-ischemia brain injury.
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.
authors: Center for Brain Repair and Rehabilitation, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Box 432, SE 405 30, Göteborg, Sweden, changlian.zhu@neuro.gu.se.
authors: Changlian
authors: C
authors: Zhu
authors: Yanyan
authors: Y
authors: Sun
authors: Jianfeng
authors: J
authors: Gao
authors: Xiaoyang
authors: X
authors: Wang
authors: Nikolaus
authors: N
authors: Plesnila
authors: Klas
authors: K
authors: Blomgren
mesh_terms: D000280:Administration, Inhalation; D000818:Animals; D000831:Animals, Newborn; D001921:Brain / Q000187:drug effects* / Q000473:pathology; D004195:Disease Models, Animal; D005260:Female; D020925:Hypoxia-Ischemia, Brain / Q000473:pathology*; D007150:Immunohistochemistry; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018696:Neuroprotective Agents / Q000008:administration & dosage*; D009569:Nitric Oxide / Q000008:administration & dosage*; D012727:Sex Characteristics
chemical_list: D018696:Neuroprotective Agents; D009569:Nitric Oxide