11β-Hydroxysteroid Dehydrogenase Type II Inhibition Causes Cerebrovascular Remodeling and Increases Infarct Size after Cerebral Ischemia

• Published in: Endocrinology (Philadelphia) 2009-02, Vol.150 (2), p.713-719
• Main Authors: Osmond, Jessica M, Dorrance, Anne M
• Format: Article
• Language: English
• Subjects: 11β-Hydroxysteroid dehydrogenase; Acetic acid; Biological and medical sciences; Blood pressure; Cerebral blood flow; Cerebral infarction; Cerebrovascular diseases; Cerebrum; Damage assessment; Dehydrogenase; Dehydrogenases; Fundamental and applied biological sciences. Psychology; Glucocorticoids; Hydroxysteroids; Inactivation; Ischemia; Medical sciences; Mineralocorticoid receptors; Neurology; Occlusion; Sodium chloride; Triphenyltetrazolium chloride; Vascular diseases and vascular malformations of the nervous system; Vertebrates: endocrinology
• ISSN: 0013-7227; 1945-7170
• DOI: 10.1210/en.2008-0808

Direct mineralocorticoid receptor (MR) activation with deoxycorticosterone acetate has deleterious effects on the cerebral vasculature. Inhibition of 11β-hydroxysteroid dehydrogenase type II (11βHSD2) mimics the detrimental effects of elevated mineralocorticoids in the heart, but the effect of enzyme inactivation on the cerebral vasculature is unknown. Therefore, we hypothesized that systemic 11βHSD2 inhibition with carbenoxolone (CBX) would cause remodeling of the middle cerebral artery (MCA) and increase the damage caused by cerebral ischemia. Six-week-old male Sprague Dawley rats were divided into control and CBX (2.5 mg/d) + 0.9% NaCl treated. After 4 wk treatment, rats were used to assess either structure and reactivity of the MCA or the response to cerebral ischemia using the MCA occlusion technique. Cerebral damage was assessed by 2,3,5-triphenyltetrazolium chloride staining and expressed as a percentage of the hemisphere infarcted. CBX treatment increased systolic blood pressure (153.2 ± 7.3 vs. 122.1 ± 4.4 mm Hg; P < 0.05) compared with control rats. MCAs from CBX treated rats were smaller and stiffer than control MCAs over a range of intralumenal pressures, indicating inward remodeling of the vessel. CBX treatment significantly increased ischemic cerebral infarct size compared with control rats (27.1 ± 5.4% vs. 14.8 ± 4.2%; P < 0.05). These data indicate that inhibition of 11βHSD2, and, thus, disproportionate glucocorticoid activation of the MR, results in remodeling of the MCA and worsens the outcome of cerebral ischemia, further underscoring the importance of understanding the mechanism by which MR activation leads to cerebrovascular disease. 11β-Hydroxysteroid dehydrogenase inhibition increases blood pressure, altering cerebral vessel structure in a manner that increases the damaged caused by focal cerebral ischemia in rats.