Abstract
The development of neuronal cells in a given cellular environment requires mechanisms that dynamically regulate the balanced interactions of multiple factors which are known to control maintenance and plasticity in function of neurons throughout constantly changing extracellular conditions. Periodic release of excitatory amino acids from both developing glial and neuronal cells into the extracellular environment and their uptake has been shown to stimulate neuronal function in concert with growth factors that control the degree of depolarization and, therefore, neuronal function. This study attempts to characterize the critical concentrations of these factors either alone or together in relation to energy metabolism, cell survival and function. We demonstrate a close correlation between energy metabolism of neuronal cells, controlled by the combination of growth-factors (βFGF, BDNF), and glutamate-taurine as well as K+ in depolarizing concentrations (10–25 mM), during the balancing act of neuronal survival or death, and neuronal function. These functions depend on medium conditions (energy sources, ion composition), the ratio of glial cells versus neurons and cell density. Granule cell migration as a measure of developmental neuronal function was analyzed in the presence of various combinations of growth factors and taurine under various depolarizing conditions (glutamate, K+). We found that K+ concentrations > 7 mM in BME and 10% horse serum blocked migration in less than 30 min. Taurine did not prevent this effect. However, in the presence of HEPES as well as in F12-medium with HEPES, taurine restored granule cell migration. On the other hand, glutamate- or NMDA-mediated depolarization stopped migrating granule cells while NMDA antagonists extended the period of migration. Taurine amplified the stop-signal in the presence of glutamate agonists but increased the number of migrating cells in the absence of glutamate. Thus, the mechanisms of glutamate receptor-mediated depolarization and K+-depolarization appear to be different. Since taurine prevents glutamate-mediated excitotoxicity, possibly by reducing Ca2+ influx under depolarizing conditions, but amplifies the stop-signal, Ca2+ levels may not control granule cell migration.
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Trenkner, E., El Idrissi, A., Harris, C. (1996). Balanced Interaction of Growth Factors and Taurine Regulate Energy Metabolism, Neuronal Survival, and Function of Cultured Mouse Cerebellar Cells under Depolarizing Conditions. In: Huxtable, R.J., Azuma, J., Kuriyama, K., Nakagawa, M., Baba, A. (eds) Taurine 2. Advances in Experimental Medicine and Biology, vol 403. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-0182-8_55
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DOI: https://doi.org/10.1007/978-1-4899-0182-8_55
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