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Updated: Mar 31, 2026
Combined Mechanical and Enzymatic Dissociation of Mouse Brain Hippocampal Tissue
Published on: October 21, 2021
Localized hypoxia within the subgranular zone determines the early survival of newborn hippocampal granule cells
Christina Chatzi1, Eric Schnell2,3, Gary L Westbrook1
1The Vollum Institute, Oregon Health and Science University, Portland, United States.
Insights
Localized hypoxia in the adult hippocampus supports newborn neural stem cell survival. This microenvironment protects cells from oxidative damage during early differentiation, promoting neurogenesis.
Area of Science:
- Neuroscience
- Cell Biology
- Stem Cell Research
Background:
- Most newborn cells in the adult hippocampus undergo cell death during early differentiation.
- Adult neural stem cells (NSCs) reside in a hypoxic environment, which promotes their survival and proliferation.
- Hypoxia's role in the survival of differentiating neural progenitor cells is not fully understood.
Purpose of the Study:
- To investigate the hypothesis that migration of intermediate progenitor cells (IPCs) away from hypoxic zones leads to oxidative stress and cell death.
- To determine if localized hypoxia within the subgranular zone (SGZ) is crucial for the survival of newborn hippocampal cells.
Main Methods:
- Observation of hypoxic niches and oxidative byproducts in the SGZ of the adult hippocampus.
- In vitro neurosphere and in vivo studies using dimethyloxallyl glycine to stabilize hypoxia-inducible factor-1α.
- Rescue experiments in Bax(fl/fl) mutant mice to assess the role of apoptosis.
Main Results:
- Hypoxic niches containing adult NSCs and early IPCs were identified in the SGZ.
- Oxidative byproducts were found in later-stage differentiating cells (late IPCs and neuroblasts).
- Stabilizing hypoxia-inducible factor-1α increased the early survival of newborn SGZ cells and neurospheres, but did not affect proliferation or differentiation.
- Bax mutant experiments supported the role of hypoxia in promoting cell survival.
Conclusions:
- Localized hypoxia within the SGZ is a critical component of the neurogenic microenvironment.
- This hypoxia promotes the activity-independent survival of adult hippocampal newborn cells during early differentiation stages.
Abstract:
The majority of adult hippocampal newborn cells die during early differentiation from intermediate progenitors (IPCs) to immature neurons. Neural stem cells in vivo are located in a relative hypoxic environment, and hypoxia enhances their survival, proliferation and stemness in vitro. Thus, we hypothesized that migration of IPCs away from hypoxic zones within the SGZ might result in oxidative damage, thus triggering cell death. Hypoxic niches were observed along the SGZ, composed of adult NSCs and early IPCs, and oxidative byproducts were present in adjacent late IPCs and neuroblasts. Stabilizing hypoxia inducible factor-1α with dimethyloxallyl glycine increased early survival, but not proliferation or differentiation, in neurospheres in vitro and in newly born SGZ cells in vivo. Rescue experiments in Bax(fl/fl) mutants supported these results. We propose that localized hypoxia within the SGZ contributes to the neurogenic microenvironment and determines the early, activity-independent survival of adult hippocampal newborn cells.
