Inflammatory responses of the substantia nigra after acute hypoxia in neonatal rats.
The neocortex and the striatum are the brain regions most known to be particularly vulnerable to acute insults like hypoxia or ischemia. In this work, we assess the possibility of cellular damage to the substantia nigra (SN) after hypoxia-reoxygenation in the new born rat. The aim of the present paper was to evaluate the expression of growth factor IGF-I, and growth factor binding proteins IGFBP-3 and IGFBP-5 genes and induction of NOS family members (nNOS, eNOS and iNOS) and TNF-alpha genes together with glia activation, in the SN at 5 and 48 h after severe hypoxia in the 7 day-old rat, a model for the term human fetus. At early time, while IGFs remain unchanged, we found a transient increase in eNOS and nNOS. Two days after the injury, nNOS expression remained high, iNOS and TNF-alpha increased and also GFAP protein expression was observed together with a profusion of reactive astrocytes distributed throughout the SN. This study on the acute effects of hypoxia on the developing brain provides additional insights into the vulnerability of the SN, a brain region involved in neurodegenerative pathologies.
Ezquer
Marcelo E
ME
IMBECU-CRICYT, Centro Regional de Investigaciones Cientificas y Tecnologicas, Mendoza 5500, Argentina.
Valdez
Susana R
SR
Seltzer
Alicia M
AM
D000818:Animals; D000831:Animals, Newborn; D015153:Blotting, Western / Q000379:methods; D003599:Cytoskeleton / Q000378:metabolism; D015870:Gene Expression / Q000502:physiology; D005904:Glial Fibrillary Acidic Protein / Q000378:metabolism; D000860:Hypoxia / Q000150:complications / Q000378:metabolism* / Q000473:pathology*; D007150:Immunohistochemistry / Q000379:methods; D007249:Inflammation / Q000209:etiology / Q000378:metabolism*; D018972:Insulin-Like Growth Factor Binding Protein 3 / Q000378:metabolism; D018975:Insulin-Like Growth Factor Binding Protein 5 / Q000378:metabolism; D007334:Insulin-Like Growth Factor I / Q000378:metabolism; D052247:Nitric Oxide Synthase Type II / Q000378:metabolism; D012333:RNA, Messenger / Q000096:biosynthesis; D051381:Rats; D017207:Rats, Sprague-Dawley; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000379:methods; D013378:Substantia Nigra / Q000254:growth & development / Q000378:metabolism* / Q000473:pathology; D013997:Time Factors
D005904:Glial Fibrillary Acidic Protein; D018972:Insulin-Like Growth Factor Binding Protein 3; D018975:Insulin-Like Growth Factor Binding Protein 5; D012333:RNA, Messenger; D007334:Insulin-Like Growth Factor I; D052247:Nitric Oxide Synthase Type II