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Opposite Effects of Lithium on Proximal and Distal Caspases of Immature and Mature Primary Neurons Correlate with Earlier Paradoxical Actions on Viability

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Abstract

To provide an explanation for earlier paradoxical findings of lithium on survival of mature and immature neurons, this study monitors changes in cytosolic caspases in rat cerebellar granule cells (CGC) grown 2–7 days in vitro (DIV), or in murine E-17 cortical neurons. Data show Li+ protects mature 7-DIV CGC parallel to a decrease in proximal and distal caspases but increases levels for immature 2-DIV-CGC or E-17 cortical neurons. Caspases mirror viability based on morphological analyses (dye uptake, phase-contrast, DNA fragmentation), and suggest protection occurs by suppressing activation of a cascade resulting in distal effectors that destroy proteins essential for neuronal survival. Protection was dose-dependent with EC50 3.0 mM and extended to 64 h in K+-serum deprived apoptotic media. Neuronal extracts contain a spectrum of proximal (-2, -8, -9) and distal (-3, -6) caspases sensitive to Li+ on assay with preferred peptide substrates and by immunobloting. The lack of direct effect on activated cytosols indicates Li+ acts upstream only on intact cells, at sites for recruitment of pivotal procaspases. Alterations of procaspase-9 p46 and membrane-bound cytochrome c (Apaf-1) point to interaction with an intrinsic Mt-mediated pathway as one of the targets. The opposite effects on caspases and viability of immature or embryological neurons point to existence of alternative pathways that alter during neurite outgrowth suggesting the use of Li+ as a probe to unravel events relevant to neurogenesis.

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Authors and Affiliations

  1. Division of Neurochemistry, Nathan S. Kline Institute for Psychiatric Research, Orangeburg, New York

    Neville Marks, Mariko Saito, Margaret A. Reilly & Martin J. Berg

  2. Division of Psychopharmacology, Nathan S. Kline Institute for Psychiatric Research, Orangeburg, New York

    Maurice Green

  3. Dementia Research Program, and Department of Psychiatry, New York University Medical Center, USA

    Austin J. Yang & Kristen Ditaranto

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  1. Neville Marks
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Marks, N., Saito, M., Green, M. et al. Opposite Effects of Lithium on Proximal and Distal Caspases of Immature and Mature Primary Neurons Correlate with Earlier Paradoxical Actions on Viability. Neurochem Res 26, 1311–1320 (2001). https://doi.org/10.1023/A:1014249517926

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