The impact of native leptomeningeal collateralization on rapid blood flow recruitment following ischemic stroke

Atsushi Kanoke, Yosuke Akamatsu, Yasuo Nishijima, Eric To, Chih C. Lee, Yuandong Li, Ruikang K. Wang, Teiji Tominaga, Jialing Liu

Research output: Contribution to journalArticlepeer-review

Abstract

The leptomeningeal collateral status is an independent predictor of stroke outcome. By means of optical coherent tomography angiography to compare two mouse strains with different extent of native leptomeningeal collateralization, we determined the spatiotemporal dynamics of collateral flow and downstream hemodynamics following ischemic stroke. A robust recruitment of leptomeningeal collateral flow was detected immediately after middle cerebral artery (MCA) occlusion in C57BL/6 mice, with continued expansion over the course of seven days. In contrast, little collateral recruitment was seen in Balb/C mice during- and one day after MCAO, which coincided with a greater infarct size and worse functional outcome compared to C57BL/6, despite a slight improvement of cortical perfusion seven days after MCAO. Both strains of mice experienced a reduction of blood flow in the penetrating arterioles (PA) by more than 90% 30-min after dMCAO, although the decrease of PA flow was greater and the recovery was less in the Balb/C mice. Further, Balb/C mice also displayed a prolonged greater heterogeneity of capillary transit time after dMCAO in the MCA territory compared to C57BL/6 mice. Our data suggest that the extent of native leptomeningeal collaterals affects downstream hemodynamics with a long lasting impact in the microvascular bed after cortical stroke.

Original languageEnglish
Pages (from-to)2165-2178
Number of pages14
JournalJournal of Cerebral Blood Flow and Metabolism
Volume40
Issue number11
DOIs
Publication statusPublished - 2020 Nov 1

Keywords

  • Doppler OCT
  • Native collaterals
  • collateral recruitment
  • distal MCAO
  • stroke outcome

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology
  • Cardiology and Cardiovascular Medicine

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