Ischemia/reperfusion-induced neovascularization in the cerebral cortex of the ovine fetus

Daniela Virgintino, Francesco Girolamo, Marco Rizzi, Nigar Ahmedli, Grazyna B. Sadowska, Edward G. Stopa, Jiyong Zhang, Barbara S. Stonestreet

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Information on the effects of injury on neovascularization in the immature brain is limited. We investigated the effects of ischemia on cerebral cortex neovascularization after the exposure of fetuses to 30 minutes of cerebral ischemia followed by 48 hours of reperfusion (I/R-48), 30 minutes of cerebral ischemia followed by 72 hours of reperfusion (I/R-72), or sham control treatment (Non-I/R). Immunohistochemical and morphometric analyses of cerebral cortex sections included immunostaining for glial fibrillary acidic protein and collagen type IV (a molecular component of the vascular basal lamina) to determine the glial vascular network in fetal brains and Ki67 as a proliferation marker. Cerebral cortices from I/R-48 and I/R-72 fetuses exhibited general responses to ischemia, including reactive astrocyte morphology, which was not observed in Non-I/R fetuses. Cell bodies of reactive proliferating astrocytes, along with large end-feet, surrounded the walls of cerebral cortex microvessels in addition to the thick collagen type IV-enriched basal lamina. Morphometric analysis of the Non-I/R group with the I/R-48 and I/R-72 groups revealed increased collagen type IV density in I/R-72 cerebral cortex microvessels (p < 0.01), which also frequently displayed a sprouting appearance characterized by growing tip cells and activated pericytes. Increases in cerebral cortex basic fibroblast growth factor were associated with neovascularization. We conclude that increased neovascularization in fetal cerebral cortices occurs within 72 hours of ischemia.

Original languageEnglish (US)
Pages (from-to)495-506
Number of pages12
JournalJournal of Neuropathology and Experimental Neurology
Volume73
Issue number6
DOIs
StatePublished - Jun 2014
Externally publishedYes

Keywords

  • Cerebral cortex
  • Fetus
  • Ischemia/reperfusion
  • Neovascularization
  • Ovine
  • Sheep

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Neurology
  • Clinical Neurology
  • Cellular and Molecular Neuroscience

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