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The Use of Intracerebral Microdialysis to Determine Changes in Blood-Brain Barrier Transport Characteristics

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Abstract

The aim of this study was to determine whether changes in the transport of drugs into the brain could be determined by in vivo intracerebral microdialysis. Atenolol was used as a model drug to determine blood-brain barrier (BBB) transport characteristics. In rats, unilateral opening of the blood-brain barrier was achieved by infusion of hyperosmolar mannitol (25%, w/v) into the left internal carotid artery. BBB transport, expressed as the ratio of the area under the curve (AUC) of atenolol in brain extracellular fluid over plasma, was three times higher for the mannitol treated hemisphere as compared with the contralateral brain or after infusion of saline, being (mean ± SEM) 0.094 ± 0.024 (n = 16), 0.029 ± 0.007 (n = 12) and 0.030 ± 0.009 (n = 12) respectively. Further evaluation of the data indicated that for experiments performed in the morning the mannitol infusion had little effect on the extent of transport of atenolol into the brain, while in the afternoon BBB transport was about 10-fold higher than in the contralateral and saline group. The mean “afternoon” ratios ± SEM were 0.155 ± 0.038 (n = 8), 0.012 ± 0.003 (n = 6) and 0.018 ± 0.006 (n = 6) respectively. It is concluded that intracerebral microdialysis is capable of revealing changes in BBB transport and regional and time-dependent differences in drug levels can be demonstrated with the use of this technique.

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  1. Division of Pharmacology, Leiden/ Amsterdam Centre for Drug Research, Leiden, The Netherlands

    Elizabeth C. M. de Lange, Mayke B. Hesselink, Meindert Danhof, Albertus G. de Boer & Douwe D. Breimer

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  1. Elizabeth C. M. de Lange
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  2. Mayke B. Hesselink
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  3. Meindert Danhof
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  4. Albertus G. de Boer
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  5. Douwe D. Breimer
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de Lange, E.C.M., Hesselink, M.B., Danhof, M. et al. The Use of Intracerebral Microdialysis to Determine Changes in Blood-Brain Barrier Transport Characteristics. Pharm Res 12, 129–133 (1995). https://doi.org/10.1023/A:1016207208406

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