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By
Jeffrey D. MacKlis, Department of Neurology, MGH-HMS Center for Nervous System Repair, Harvard Medical School, Boston, MA, USA,
Gerd Kempermann, Max Delbruck Center for Molecular Medicine (MDC), Berlin-Buch, Germany
Edited by
Michael Selzer, University of Pennsylvania,Stephanie Clarke, Université de Lausanne, Switzerland,Leonardo Cohen, National Institute of Mental Health, Bethesda, Maryland,Pamela Duncan, University of Florida,Fred Gage, Salk Institute for Biological Studies, San Diego
This chapter deals with adult neurogenesis and examines what is known about the behavior and function of precursor cells in the adult brain. It outlines few examples of normally occurring neurogenesis in the mammalian central nervous system (CNS), and describes adult neural precursors. Functional adult neurogenesis occurs in many non-mammalian vertebrates. The chapter reviews a few lines of recent research demonstrating that endogenous neural precursors can be induced to differentiate into neurons in regions of the adult brain that do not normally undergo neurogenesis. In the adult mammalian brain, neurogenesis normally occurs only in the olfactory bulb and the dentate gyrus (DG) of the hippocampus. Transplantation studies support the concept of neurogenic and non-neurogenic regions, and provide evidence about the role of the microenvironment in realizing the potential of neuronal stem or progenitor cells. Neuronal replacement therapies based on manipulation of endogenous precursors may be possible in the future.
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