Effects of inhibition of nitric oxide synthase on blood-brain barrier transport in focal cerebral ischemia

Oak Za Chi, Hwu Meei Wei, Arabinda K. Sinha, Harvey R. Weiss

Research output: Contribution to journalArticle

42 Scopus citations

Abstract

This study was performed to determine whether nitric oxide (NO) alters the transport of small hydrophilic molecules across the blood-brain barrier in focal cerebral ischemia by administering an NO synthase inhibitor, NG-nitro-L-arginine methyl ester (L-NAME) and by measuring the blood-brain barrier transfer coefficient (Ki) of14C-α-aminoisobutyric acid (14C- AIB) in the rats with middle cerebral artery occluded under isoflurane anesthesia. L-NAME increased the mean arterial blood pressure from 91 ± 9 to 134 ± 13 mm Hg. The Ki of the ischemic cortex (ICO) was 26% higher than that of the contralateral cortex (CCO) in the control animals without the L-NAME treatment. However, in the L-NAME-treated animals, Ki was 33% lower in the ICO than in the CCO. The Ki of ICO in the L-NAME group was significantly lower (−54%) than that of the control group. L-NAME did not affect Ki significantly in the nonischemic brain regions. Our data demonstrate that focal ischemia increased Ki of14C-AIB, but L- NAME significantly decreased the Ki in the focal ischemic area of the brain without causing significant changes in the nonischemic tissue. Our results suggest that NO may participate in increasing transport of small hydrophilic molecules across the blood-brain barrier in focal ischemia.

Original languageEnglish (US)
Pages (from-to)367-373
Number of pages7
JournalPharmacology
Volume48
Issue number6
DOIs
StatePublished - Jan 1 1994

All Science Journal Classification (ASJC) codes

  • Pharmacology

Keywords

  • Blood-brain barrier
  • Brain
  • Focal ischemia
  • Nitric oxide synthase

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