Journal
BRAIN RESEARCH
Volume 1132, Issue 1, Pages 185-192Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.brainres.2006.10.098
Keywords
sildenafil; angiogenesis; CBF; tissue signature; functional recovery; MRI
Categories
Funding
- NHLBI NIH HHS [R01 HL064766, HL64766] Funding Source: Medline
- NINDS NIH HHS [R01 NS38292, R01 NS048349, R01 NS043324, P01 NS23393, R01 NS48349, R01 NS038292, P01 NS42345, P01 NS042345, P01 NS023393, R01 NS43324] Funding Source: Medline
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To dynamically investigate the long-term response of an ischemic lesion in rat brain to the administration of sildenafil, male Wistar rats subjected to embolic stroke were treated with sildenafil (n=11) or saline (n=10) at a dose of 10 mg/kg administered subcutaneously 24-h after stroke and daily for an additional 6 days. Magnetic resonance images were acquired and functional performance was measured in all animals at I day, 2 days and weekly for 6 weeks post-stroke. All rats were sacrificed 6 weeks after stroke and endothelial barrier antigen immunostaining was employed for morphological analysis and quantification of cerebral vessels. Map-ISODATA was computed from T-1, T-2 and T-1sat maps. ISODATA derived tissue signatures characterize the degree of ischemic injury. Based on the map-ISODATA calculated at 6 weeks, the ischemic lesion for each animal was divided into two specific regions, the ischemic boundary and ischemic core. The temporal profiles of cerebral blood flow (CBF) and tissue signature were retrospectively tracked in these two regions and were compared with histological evaluation and functional outcome. After 1 week of sildenafil treatment, the ischemic lesion exhibited two significantly different regions, with higher CBF level and correspondingly, lower tissue signature value in the boundary region than in the core region. Sildenafil treatment did not significantly reduce the lesion size, but did enhance angiogenesis. Functional performance was significantly increased after sildenafil treatment compared with the control group. Administration of sildenafil to rats with embolic stroke enhances angiogenesis and selectively increases the CBF level in the ischemic boundary, and improves neurological functional recovery compared to saline-treated rats. (c) 2006 Elsevier B.V. All rights reserved.
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