Abstract
New neurons are generated from stem cells in a few regions of the adult mammalian brain. Here we provide evidence for the generation of dopaminergic projection neurons of the type that are lost in Parkinson's disease from stem cells in the adult rodent brain and show that the rate of neurogenesis is increased after a lesion. The number of new neurons generated under physiological conditions in substantia nigra pars compacta was found to be several orders of magnitude smaller than in the granular cell layer of the dentate gyrus of the hippocampus. However, if the rate of neuronal turnover is constant, the entire population of dopaminergic neurons in substantia nigra could be replaced during the lifespan of a mouse. These data indicate that neurogenesis in the adult brain is more widespread than previously thought and may have implications for our understanding of the pathogenesis and treatment of neurodegenerative disorders such as Parkinson's disease.
MeSH Terms
1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine/pharmacology
Animals
Antimetabolites/pharmacology
Apoptosis
Bromodeoxyuridine/pharmacology
Dopamine/metabolism
Dopamine Agents/pharmacology
Hippocampus/pathology
Humans
Male
Mice
Mice, Inbred C57BL
Microscopy, Fluorescence
Neurons/metabolism,pathology
Parkinson Disease/pathology
Stem Cells/metabolism
Substantia Nigra/anatomy & histology,metabolism,pathology
Synapses
Time Factors
Chemicals
Antimetabolites
Dopamine Agents
1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine
Bromodeoxyuridine
Dopamine
Authors & Affiliations
10 authors, click to expand affiliations / ORCID
Zhao Ming
Departments of Neuroscience, Cell and Molecular Biology, Medical Nobel Institute, and Woman and Child Health, Karolinska Institute, SE-171 77 Stockholm, Sweden.
Momma Stefan
Delfani Kioumars
Carlen Marie
Cassidy Robert M
Johansson Clas B
Brismar Hjalmar
Shupliakov Oleg
Frisen Jonas
Janson Ann Marie
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