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Effects of chronic lithium administration on rat brain phosphatidylinositol cycle constituents, membrane phospholipids and amino acids
Author(s) -
Pettegrew Jay W,
Panchalingam Kanagasabai,
McClure Richard J,
Gershon Samuel,
Muenz Larry R,
Levine Joseph
Publication year - 2001
Publication title -
bipolar disorders
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.285
H-Index - 129
eISSN - 1399-5618
pISSN - 1398-5647
DOI - 10.1034/j.1399-5618.2001.30404.x
Subject(s) - lithium (medication) , phosphatidylinositol , pharmacology , chemistry , neuroscience , endocrinology , medicine , biochemistry , biology , signal transduction
Objective:There is evidence linking affective disorders and their treatment to alterations in membrane phospholipid metabolism, the phosphatidylinositol (PtdIns) second messenger cycle and brain excitatory and inhibitory amino acids. This study examines lithium effects on rat brain metabolites associated with the above systems and their reversal by myo ‐inositol.
Methods: Thirty rats were treated for 14 days with i.p. lithium, saline or lithium plus myo ‐inositol. 1 H, 31 P and 7 Li NMR were used to measure brain metabolites.
Results: Lithium, administered alone or with myo ‐inositol, resulted in brain lithium concentrations of approximately 0.6 μM/gram brain tissue. Brain myo ‐inositol was unchanged when lithium was co‐administered with myo ‐inositol. Lithium increased brain inositol‐1‐phosphate (I1P) by 98% compared with saline and this effect was not attenuated by the addition of myo ‐inositol. Lithium treatment decreased phosphatidylserine (PtdSer) and PtdIns by 3% and 8%, respectively. Lithium also decreased taurine levels by 8% and increased aspartate levels by 9%. The above effects of lithium on PtdSer, PtdIns and taurine were attenuated or abolished by the co‐administration of myo ‐inositol.
Conclusions: Lithium alters levels of key membrane phospholipids and appears to affect the balance between inhibitory and excitatory amino acids in rat brain. Co‐administration of myo ‐inositol attenuates some of these lithium effects on brain metabolites.