Adult neurogenesis has been questioned for many years. In the
early 1900s, a dogma was established that denied new neuron
formation in the adult brain. In the last century however, new
discoveries have demonstrated the real existence of proliferation
in the adult brain, and in the last decade, these studies led to
the identification of neural stem cells in mammals. Adult neural
stem cells are undifferentiated cells that are present in the adult
brain and are capable of dividing and differentiating into glia and
new neurons. Newly formed neurons terminally differentiate into
mature neurons in the olfactory bulb and the dentate gyrus of the
hippocampus. Since then, a number of new research lines have
emerged whose common objective is the phenotypical and molecular
characterization of brain stem cells. As a result, new therapies
are successfully being applied to animal models for certain
neurodegenerative diseases or stroke. At present, and in years to
come, this finding extends to the adult human brain, and gives
reason and hope to all the previous studies.
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