Phosphate Transport in Capillaries of the Blood-Brain Barrier

  • Richard Béliveau
  • Lise Dallaire
  • Sylvie Giroux
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 331)

Abstract

Endothelial cells of cerebral capillaries form a continuous barrier between blood and brain interstitium. These endothelial cells, sealed together by tight junctions, do not possess fenestrations or transendothelial channels (1,2). Brain capillaries also contain a large number of mitochondria and are able to metabolize a variety of substrates (3, 4). This specialized endothelium regulates the movement of solutes between blood and brain. This is accomplished through carrier-mediated transport systems for hexoses, monocarboxylic acids, amino acids, nucleosides, purines and amines (5). Active transport pumps in the endothelial cells of brain capillaries appear to maintain the volume and composition of brain’s interstitial fluid (6). This extracellular fluid differs from plasma in that it is almost free of protein and differs from an ultrafiltrate of plasma by maintaining the concentration of various ions at distinct levels. In fact, the concentration of inorganic phosphate in the interstitial fluid of the brain is held between 0.5 and 1.0 mM, and the plasma level is maintained between 1.5 and 1.8 mM (7). Maintenance of this transcellular phosphate concentration gradient could be a result of transport mechanisms at the luminal and anti-luminal sites of the membranes of cerebral capillaries. The relationship of inorganic phosphate to the phosphorylation processes could account for a regulation of the concentration of this ion by a membrane transport mechanism. Furthermore, capillary cells require phosphate for energy demands, as reflected by the large number of mitochondria, and for synthesis of nucleic acids and complex lipids (3). Phosphate transport in brain capillaries was studied with metabolically active capillaries isolated from bovine cortex (8).

Keywords

Permeability Glycerol Filtration Adenosine Luminal 

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Copyright information

© Springer Science+Business Media New York 1993

Authors and Affiliations

  • Richard Béliveau
    • 1
  • Lise Dallaire
    • 1
  • Sylvie Giroux
    • 1
  1. 1.Laboratoire de Membranologie Groupe de Recherche en Biothérapeutique Moléculaire Département de biochimieUniversité du Québec à MontréalSucc. A, Montréal (Québec)Canada

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