Abstract
In order for stem cells to fulfill their clinical promise, we must understand their developmental transitions and it must be possible to control the differentiation of stem cells into specific cell fates. To understand the mechanism of the sequential restriction and multipotency of stem cells, we have established culture conditions that allow the differentiation of multipotential neural stem cells from postnatal stem cells. We used immunocytochemistry, fluorescence microscopy, and calcium imaging to demonstrate that progeny of adult rat neural stem cells develop into functional neurons that release excitatory neurotransmitters. We also found that the nontoxic heavy chain fragment of tetanus toxin, a toxin that targets neurons with high specificity, retained the specificity toward neural stem cell-derived neurons. These studies show that neural stem cells derived from adult tissues retain the potential to differentiate into functional neurons with morphological and functional properties of mature central nervous system neurons.
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