Hypoxic Preconditioning Suppresses Glial Activation and Neuroinflammation in Neonatal Brain Insults.
Perinatal insults and subsequent neuroinflammation are the major mechanisms of neonatal brain injury, but there have been only scarce reports on the associations between hypoxic preconditioning and glial activation. Here we use neonatal hypoxia-ischemia brain injury model in 7-day-old rats and in vitro hypoxia model with primary mixed glial culture and the BV-2 microglial cell line to assess the effects of hypoxia and hypoxic preconditioning on glial activation. Hypoxia-ischemia brain insult induced significant brain weight reduction, profound cell loss, and reactive gliosis in the damaged hemisphere. Hypoxic preconditioning significantly attenuated glial activation and resulted in robust neuroprotection. As early as 2 h after the hypoxia-ischemia insult, proinflammatory gene upregulation was suppressed in the hypoxic preconditioning group. In vitro experiments showed that exposure to 0.5% oxygen for 4 h induced a glial inflammatory response. Exposure to brief hypoxia (0.5 h) 24 h before the hypoxic insult significantly ameliorated this response. In conclusion, hypoxic preconditioning confers strong neuroprotection, possibly through suppression of glial activation and subsequent inflammatory responses after hypoxia-ischemia insults in neonatal rats. This might therefore be a promising therapeutic approach for rescuing neonatal brain injury.
Graduate Institute of Clinical Medicine, National Taiwan University College of Medicine, Taipei, Taiwan ; Departments of Pediatrics, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan.
Chien-Yi
CY
Chen
Department of Anesthesiology, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan.
Wei-Zen
WZ
Sun
Department of Pharmacology, College of Medicine, National Taiwan University, No. 1 Jen Ai Road, Section 1, Taipei 10051, Taiwan.
Kai-Hsiang
KH
Kang
Departments of Pediatrics, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan.
Hung-Chieh
HC
Chou
Departments of Pediatrics, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan.
Po-Nien
PN
Tsao
Departments of Pediatrics, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan.
Wu-Shiun
WS
Hsieh
Department of Pharmacology, College of Medicine, National Taiwan University, No. 1 Jen Ai Road, Section 1, Taipei 10051, Taiwan.
Wen-Mei
WM
Fu
D000818:Animals; D000831:Animals, Newborn; D001921:Brain / Q000378:metabolism / Q000473:pathology; D004195:Disease Models, Animal; D000860:Hypoxia / Q000378:metabolism / Q000503:physiopathology*; D020925:Hypoxia-Ischemia, Brain / Q000378:metabolism / Q000473:pathology* / Q000517:prevention & control*; D019194:Ischemic Preconditioning / Q000379:methods*; D008297:Male; D017628:Microglia / Q000378:metabolism / Q000473:pathology; D051381:Rats; D017207:Rats, Sprague-Dawley