Differential Effects of Lithium on Muscarinic Receptor Stimulation of Inositol Phosphates in Rat Cerebral Cortex Slices
- 1 November 1985
- journal article
- research article
- Published by Wiley in Journal of Neurochemistry
- Vol. 45 (5), 1514-1521
- https://doi.org/10.1111/j.1471-4159.1985.tb07221.x
Abstract
The accumulation of labelled inositol mono-, bis-, and trisphosphate in rat cerebral cortex slices was examined following preincubation with [3H]inositol. The muscarinic receptor agonist carbachol produced a rapid and sustained increased accumulation of each labelled inositol phosphate both in the presence and absence of 5 mM lithium. Lithium potentiated carbachol-stimulated accumulation of inositol monophosphate (EC50 0.5 mM) and inositol bisphosphate (EC50 4 mM) in a concentration-dependent manner. However, exposure to lithium in the presence of the muscarinic agonist produced a concentration- and time-dependent inhibition of inositol trisphosphate accumulation that was not related to receptor desensitisation. Although the present data do suggest that polyphosphoinositides are substrates for agonist-stimulated phospholipase C in brain, these results may not be entirely consistent with the production of inositol mono- and bisphosphate through inositol trisphosphate dephosphorylation. Furthermore, these data suggest site(s) additional to inositol monophosphatase that are affected by lithium.Keywords
This publication has 36 references indexed in Scilit:
- Phosphoinositide turnover provides a link in stimulus—response couplingTrends in Biochemical Sciences, 1985
- Histamine Stimulation of Inositol 1‐Phosphate Accumulation in Lithium‐Treated Slices from Regions of Guinea Pig BrainJournal of Neurochemistry, 1984
- Correlation between inositol phospholipid hydrolysis and substance P receptors in rat CNSNature, 1984
- Inositol Phospholipid Hydrolysis in Rat Cerebral Cortical Slices: I. Receptor CharacterisationJournal of Neurochemistry, 1984
- Release of Ca2+ from a nonmitochondrial intracellular store in pancreatic acinar cells by inositol-1,4,5-trisphosphateNature, 1983
- Phosphodiesteratic breakdown of endogenous polyphosphoinositides in nerve ending membranesBiochemical and Biophysical Research Communications, 1983
- The stimulation of inositol lipid metabolism that accompanies calcium mobilization in stimulated cells: defined characteristics and unanswered questionsPhilosophical Transactions of the Royal Society of London. B, Biological Sciences, 1981
- Phosphatidyldmositol hydrolysis: A multifunctional transducing mechanismMolecular and Cellular Endocrinology, 1981
- Inositol phospholipids and cell surface receptor functionBiochimica et Biophysica Acta (BBA) - Reviews on Biomembranes, 1975
- Acetycholine stimulation of the phosphodiesteratic cleavage of guinea pig brain phosphoinositidesLife Sciences, 1968