Abstract
Lithium and valproate are chemically unrelated compounds that are used to treat manic-depressive illness. Previously, we reported that lithium ions upregulate genes encoding proteins primarily associated with large dense core vesicles (LDCV) in nerve growth factor (NGF)-differentiated PC12 cells, but not in undifferentiated PC12 cells. Moreover, lithium did not alter the expression of proteins associated with small-clear, synaptic-like vesicles (SSV) in these cells. Based on these observations, we investigated whether valproate had actions similar to those of lithium in PC12 cells. Thus, undifferentiated or NGF-differentiated PC12 cells were exposed to lithium (1 mM) or valproate (1 mM) for 48 h. Extracts from these cells were submitted to semiquantitative Northern and Western analyses. In NGF-differentiated cells, both agents increased the expression of proteins associated with LDCV, the vesicular monoamine transporter 1 (VMAT1), and cysteine string protein (CSP). These same treatments did not alter the expression of proteins primarily associated with SSV, the vesicular acetylcholine transporter (VAChT), and synaptophysin (SY). Furthermore, neither drug affected the expression of these proteins in undifferentiated cells. Interestingly, secretion of 3H-dopamine was increased in cells exhibiting the increase of VMAT1 and csp. Taken together, the convergent effects of these chemically diverse compounds suggest that altered dynamics of LDCV may play a vital role in the biochemical pathway, leading to the relief of the symptoms of manic depression.
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Acknowledgements
We are grateful to Dr E Schweitzer for the PC12 cells and comments, and Dr S Gambhir for analytical equipment. This work was supported by NIH Grant NS31934 (JAU) and an Ahmanson Neurobiology Post-doctoral Fellowship (MLC).
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Cordeiro, M., Gundersen, C. & Umbach, J. Convergent Effects of Lithium and Valproate on the Expression of Proteins Associated with Large Dense Core Vesicles in NGF-differentiated PC12 Cells. Neuropsychopharmacol 29, 39–44 (2004). https://doi.org/10.1038/sj.npp.1300288
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DOI: https://doi.org/10.1038/sj.npp.1300288
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