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J Appl Physiol 71: 795-800, 1991;
8750-7587/91 $5.00
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Journal of Applied Physiology, Vol 71, Issue 3 795-800, Copyright © 1991 by American Physiological Society

ARTICLES

Role of NaCl cotransport in cerebrospinal fluid production: effects of loop diuretics

S. Javaheri
Pulmonary Section, Veterans Administration Medical Center, Cincinnati, Ohio 45220.

Cerebrospinal fluid (CSF) is secreted primarily by the choroid plexus (CP) located in the cerebral ventricles. Although much is known about ionic composition of cisternal CSF, the mechanisms involved in secretion of CSF in mammals are still not understood. The main aim of this report is to critically review the role of NaCl cotransport carrier in CSF production. On the basis of the studies in the literature, a model for CSF production by the CP is proposed. In this model, CP cells are assumed to be equipped with an NaCl cotransport carrier located on the basolateral (blood-facing) membrane. Because Na+ and Cl- are the two principal ions in CSF, their continued secretions into cerebral ventricles by CP cells require an adequate intracellular supply, which may be guaranteed by the NaCl cotransport carrier. Although this appears to be a reasonable assumption, making the processes involved in CSF production similar to those of other secretory epithelial cells, the presence of such a carrier in mammalian CP remains controversial. The reasons for this controversy are critically reviewed, and some suggestions for further studies are made.


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