Regulatory Volume Decrease in Neural Precursor Cells: Taurine Efflux and Gene Microarray Analysis

BACKGROUND/AIMS: Neural stem/ progenitor cells (NPCs) endure important changes in cell volume during growth, proliferation and migration. As a first approach to know about NPC response to cell volume changes, the Regulatory Volume Decrease (RVD) subsequent to hypotonic swelling was investigated. METHODS: NPCs obtained from the mesencephalon and the subventricular zone of embryonic and adult mice, respectively, were grown and cultured as neurospheres. Cell volume changes were measured by large-angle light-scattering and taurine efflux by [(3)H]-taurine. Expression of genes encoding molecules related to RVD was analysed using a DNA microarray obtained from NPC samples. RESULTS: Embryonic and adult NPCs exposed to osmolarity reduction (H15, H30, H40) exhibited rapid swelling followed by RVD. The magnitude, efficiency and pharmacological profile, of RVD and of [(3)H]-taurine osmosensitive efflux were comparable to those found in cultured brain cells, astrocytes and neurons. The relative expression of genes encoding molecules related to volume regulation, i.e. K(+) and Cl(-) channels, cotransporters, exchangers and aquaporins were identified in NPCs. CONCLUSION: NPCs show the ability to respond to hypotonic-evoked volume changes by adaptative recovery processes, similar to those found in other cultured brain cells. Genes related to molecules involved in RVD were found expressed in NPCs.

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