title: Angiostatins decrease in the kidney of newborn piglets after hypoxia-reoxygenation.
abstract: Little is known about the expression of kidney angiostatin in the hypoxia and reoxygenation of neonates. In this study, we compared the effect of 21% and 100% reoxygenation on kidney levels of angiostatin and its related factors in newborn piglets subjected to hypoxia-reoxygenation. Newborn piglets were subjected to 2h hypoxia followed by 1h of reoxygenation with either 21% or 100% oxygen and observed for 4days. There were 3 isoforms (38, 43 and 50kDa) of angiostatins identified in the kidney tissue of newborn piglets with the 38kDa being the major isoform (~60%). The 38kDa, but not 43 and 50kDa, angiostatin isoform correlated significantly with the levels of total angiostatin and plasminogen (r=0.95 and r=0.58, respectively). On day 4 of recovery in 100% hypoxic-reoxygenated group, there were decreases in kidney tissue levels of plasminogen, total angiostatin, angiostatin (38 and 43kDa, but not 50kDa), whereas no significant changes were found in the 21% hypoxic-reoxygenated group when compared to the sham-operated piglets with no hypoxia-reoxygenation. Both 21% and 100% hypoxic-reoxygenated groups did not show significant changes in kidney tissue levels of 50kDa angiostatin, MMP-2, MMP-9 and HIF-1alpha. In comparison to 21% oxygen, neonatal resuscitation with 100% oxygen decreased the kidney tissue levels of plasminogen and angiostatin that may play a role in neonatal kidney injury and altered renal development in adulthood.
authors.affiliation: Department of Oncology, University of Alberta, Edmonton, Alberta, Canada T6G 2S2.
authors.forename: Marwan
authors.initials: M
authors.lastname: Emara
authors.forename: Laila
authors.initials: L
authors.lastname: Obaid
authors.forename: Scott
authors.initials: S
authors.lastname: Johnson
authors.forename: David L
authors.initials: DL
authors.lastname: Bigam
authors.forename: Po-Yin
authors.initials: PY
authors.lastname: Cheung
mesh_terms: D043168:Angiostatins / Q000378:metabolism*; D000818:Animals; D000831:Animals, Newborn; D004195:Disease Models, Animal; D000860:Hypoxia / Q000503:physiopathology*; D051795:Hypoxia-Inducible Factor 1, alpha Subunit / Q000378:metabolism; D007668:Kidney / Q000378:metabolism*; D020778:Matrix Metalloproteinase 2 / Q000378:metabolism; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism; D010100:Oxygen / Q000008:administration & dosage*; D010958:Plasminogen / Q000378:metabolism; D020033:Protein Isoforms; D013552:Swine
chemical_list: D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D020033:Protein Isoforms; D043168:Angiostatins; D010958:Plasminogen; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9; D010100:Oxygen