PURPOSE: The lithium disposition to cerebrospinal fluid (CSF) was evaluated in rats with acute renal failure (ARF) to examine whether electrolyte homeostasis of the CSF is perturbed by kidney dysfunction. In addition, the effects of renal failure on choroid plexial expressions of the Na+-K+-2Cl- co-transporter (NKCC1) and Na+/H+ exchanger (NHE1) were also studied. METHODS: After lithium was intravenously administered at a dose of 4 mmol/kg, its concentration profile in plasma was evaluated by collecting plasma specimens, while that in CSF was monitored with a microdialysis probe in the lateral ventricles. NKCC1 and NHE1 expressions were measured via the Western immunoblot method using membrane specimens prepared from the choroid plexus in normal and ARF rats. RESULTS: The lithium concentration in CSF of ARF rats was 30% lower than that of normal rats, while their plasma lithium profiles were almost the same, indicating that the lithium disposition to CSF was decreased in ARF rats. It was revealed that the choroid plexial expression of NKCC1 was increased by 40% in ARF rats, but that of NHE1 was unchanged. CONCLUSION: ARF decreases the lithium disposition to CSF, possibly by promoting lithium efflux from CSF due to increased NKCC1 expression in the choroid plexus.
PURPOSE: The lithium disposition to cerebrospinal fluid (CSF) was evaluated in rats with acute renal failure (ARF) to examine whether electrolyte homeostasis of the CSF is perturbed by kidney dysfunction. In addition, the effects of renal failure on choroid plexial expressions of the Na+-K+-2Cl- co-transporter (NKCC1) and Na+/H+ exchanger (NHE1) were also studied. METHODS: After lithium was intravenously administered at a dose of 4 mmol/kg, its concentration profile in plasma was evaluated by collecting plasma specimens, while that in CSF was monitored with a microdialysis probe in the lateral ventricles. NKCC1 and NHE1 expressions were measured via the Western immunoblot method using membrane specimens prepared from the choroid plexus in normal and ARFrats. RESULTS: The lithium concentration in CSF of ARFrats was 30% lower than that of normal rats, while their plasma lithium profiles were almost the same, indicating that the lithium disposition to CSF was decreased in ARFrats. It was revealed that the choroid plexial expression of NKCC1 was increased by 40% in ARFrats, but that of NHE1 was unchanged. CONCLUSION:ARF decreases the lithium disposition to CSF, possibly by promoting lithium efflux from CSF due to increased NKCC1 expression in the choroid plexus.
Authors: Zoran B Redzic; Jane E Preston; John A Duncan; Adam Chodobski; Joanna Szmydynger-Chodobska Journal: Curr Top Dev Biol Date: 2005 Impact factor: 4.897
Authors: Francois A Leblond; Martin Petrucci; Pierre Dubé; Gilbert Bernier; Alain Bonnardeaux; Vincent Pichette Journal: J Am Soc Nephrol Date: 2002-06 Impact factor: 10.121
Authors: H Friess; Z W Zhu; F F di Mola; C Kulli; H U Graber; A Andren-Sandberg; A Zimmermann; M Korc; M Reinshagen; M W Büchler Journal: Ann Surg Date: 1999-11 Impact factor: 12.969