Human adult neurogenesis across the ages: An immunohistochemical study

C. V. Dennis, L. S. Suh, M. L. Rodriguez, J. J. Kril, G. T. Sutherland*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

123 Citations (Scopus)

Abstract

Aims: Neurogenesis 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. Methods: Cell 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. Results: There 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. Conclusions: This 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.

Original languageEnglish
Pages (from-to)621-638
Number of pages18
JournalNeuropathology and Applied Neurobiology
Volume42
Issue number7
DOIs
Publication statusPublished - Dec 2016
Externally publishedYes

Keywords

  • adult neurogenesis
  • human post-mortem brain tissue
  • immunohistochemistry
  • microglial proliferation
  • subventricular zone and subgranular zone

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