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. 1980 Dec;309:329–339. doi: 10.1113/jphysiol.1980.sp013511

The effect of lithium on electrolyte transport by the in situ choroid plexus of the cat.

D J Reed, M H Yen
PMCID: PMC1274587  PMID: 7252869

Abstract

1. The effects of lithium on electrolyte transport were studied by using the cat choroid plexus isolated in a chamber in situ. 2. Lithium infused intravenously to produce plasma lithium concentrations up to 5 m-equiv/l. caused an increase in plasma magnesium with no effect on the concentration of magnesium in the chamber fluid. 3. When 22NaCl was infused intravenously the chamber fluid/plasma ratio of 22Na was nearly 1 in the first 30 min sample and at the steady state it was significantly greater than 1. 4. When lithium chloride (1.5 m-equiv/l.) or potassium chloride (6.6 m-equiv/l.) was added to the chamber at the start of a collection period with plasma 22Na in the steady state, the 22Na content of the chamber fluid promptly increased 118 and 68%, respectively, above the control value with no increase in secretory rate. 5. The addition of ouabain to the chamber fluid, in addition to the lithium chloride or potassium chloride, tended to stimulate or have no significant effect on 22Na uptake at a concentration of 10(-5) M and to reduce it as well as the secretory rate at 10(-3) M. 6. The date are compatible with there being two functionally separate sodium transport systems in the choroid plexus. One transports sodium accompanied by an anion and water to provide the fluid secreted into the chamber (c.s.f.) and the other operates primarily to regulate the potassium concentration of the c.s.f. by pumping potassium out in exchange for sodium. 7. Lithium can be transported by both systems to a limited extent and the presence of lithium in the c.s.f. stimulates the sodium-potassium regulating pump.

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Selected References

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