Human neurosphere stem cells offer promising potential for the treatment of neurodegenerative diseases. Their well characterized multi-potency of differentiating into neurons, astrocytes, and oligodendrocytes when exposed to the optimum exogenous growth factors make them an exciting area of study (38). Finding novel endogenous methods of modulating stem cell metabolism will allow for the safer treatment of various brain disorders (34). In this experiment, melatonin, N-acetylserotonin, L-tryptophan, and L-DOPA are added in three different concentrations to neurospheres suspended in HNSC/GBM media with less than optimal concentrations of exogenous epidermal growth factor (EGF) and fibroblast growth factor (FGF). The alamarBlue assay (resazurin) was chosen as the most suitable assay for measuring neurosphere metabolism. Metabolic neural stem cells would cause the greatest reduction of the oxidized alamarBlue reagent (resazurin?resorufin), which was detected by a fluorescent plate reader (39-41). The percent reduction in alamarBlue was calculated for all four molecules at three different concentrations and compared to controls without any molecule. Our results illustrate that there was no statistically significant difference at p<0.05 between the biological molecules and the control group except for two exceptions (labeled with asterisks on figures 3 and 5) L-DOPA at a 40 micromolar concentration after 4 hours of incubation and melatonin at a 40 micromolar concentration after 52 hours of incubation.
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Bachelor of Science (B.S.)
Burnett School of Biomedical Sciences
Molecular Biology and Microbiology
Dissertations, Academic -- Medicine; Medicine -- Dissertations, Academic
Length of Campus-only Access
Honors in the Major Thesis
Heriba, Omar, "Melatonin and Neurogenesis: A Comparative Study of the Efficacy of Melatonin, Its Precursors, and L-Dopa on Neural Stem Cell Metabolism in Human Adult Neurospheres" (2014). HIM 1990-2015. 1669.