Human adult neurogenesis across the ages: An immunohistochemical study

Neuropathology and Applied Neurobiology - Tập 42 Số 7 - Trang 621-638 - 2016
Claude Dennis1, Lisa S. Suh2,1, Michael Rodriguez1, Jillian J. Kril1, Greg T. Sutherland1
1Discipline of Pathology Sydney Medical School University of Sydney Camperdown NSW Australia
2Dementia Research Unit School of Medical Sciences University of New South Wales Kensington NSW Australia

Tóm tắt

AbstractAimsNeurogenesis in the postnatal human brain occurs in two neurogenic niches; the subventricular zone (SVZ) in the wall of the lateral ventricles and the subgranular zone (SGZ) of the hippocampus. The extent to which this physiological process continues into adulthood is an area of ongoing research. This study aimed to characterize markers of cell proliferation and assess the efficacy of antibodies used to identify neurogenesis in both neurogenic niches of the human brain.MethodsCell proliferation and neurogenesis were simultaneously examined in the SVZ and SGZ of 23 individuals aged 0.2–59 years, using immunohistochemistry and immunofluorescence in combination with unbiased stereology.ResultsThere was a marked decline in proliferating cells in both neurogenic niches in early infancy with levels reaching those seen in the adjacent parenchyma by 4 and 1 year of age, in the SVZ and SGZ, respectively. Furthermore, the phenotype of these proliferating cells in both niches changed with age. In infants, proliferating cells co‐expressed neural progenitor (epidermal growth factor receptor), immature neuronal (doublecortin and beta III tubulin) and oligodendrocytic (Olig2) markers. However, after 3 years of age, microglia were the only proliferating cells found in either niche or in the adjacent parenchyma.ConclusionsThis study demonstrates a marked decline in neurogenesis in both neurogenic niches in early childhood, and that the sparse proliferating cells in the adult brain are largely microglia.

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Neuropathology and Applied Neurobiology

Tập 42 Số 7

621-638

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