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Neurogenesis and neuroplasticity mechanisms
Research Guide
What is Neurogenesis and neuroplasticity mechanisms?
Neurogenesis and neuroplasticity mechanisms refer to the processes of generating new neurons and glial cells in the adult mammalian brain and the adaptive changes in neuronal structure and function, including synaptic plasticity, that support brain development, cognitive function, and responses to neurological disorders.
This field encompasses 61,343 papers on adult neurogenesis, focusing on generation, differentiation, and functional roles of new neurons and glia in regions like the hippocampus. Key studies demonstrate neural stem cells persist in the adult human hippocampus (Eriksson et al., 1998) and can generate neurons and astrocytes from adult mammalian CNS cells (Reynolds and Weiss, 1992). Research highlights links to cognitive improvements, such as exercise increasing hippocampal size (Erickson et al., 2011), and antidepressant effects requiring hippocampal neurogenesis (Santarelli et al., 2003).
Topic Hierarchy
Research Sub-Topics
Hippocampal Neurogenesis in Adults
This sub-topic studies the generation and integration of new neurons in the adult dentate gyrus, influenced by exercise and stress. Researchers examine functional roles in pattern separation and memory.
Neural Stem Cell Regulation
Investigations focus on quiescence, proliferation, and lineage commitment of neural stem cells in the subventricular zone and hippocampus. Studies explore niche signals and epigenetic controls.
Neuronal Differentiation Mechanisms
Researchers analyze transcription factors, signaling pathways like Notch and Wnt, driving progenitor differentiation into neurons. Models include in vitro and organoid systems.
Neurogenesis in Cognitive Function
This area examines how newborn neurons contribute to learning, memory consolidation, and forgetting. Studies use ablation models and behavioral assays in rodents.
Oligodendrocyte Progenitor Dynamics
Studies track OPC proliferation, migration, and myelination in adult brain repair contexts like demyelination. Research includes single-cell RNA-seq and lineage tracing.
Why It Matters
Neurogenesis and neuroplasticity mechanisms enable neuronal replacement and synaptic adaptations that underpin cognitive function and recovery from brain insults. Erickson et al. (2011) showed that aerobic exercise training increased anterior hippocampal volume by 2% over one year, reversing age-related loss by 1-2 years and improving spatial memory in 120 older adults. Santarelli et al. (2003) demonstrated that disrupting hippocampal neurogenesis blocks behavioral responses to antidepressants in mice, linking it to therapeutic efficacy in depression treatment. Gage (2000) established that mammalian neural stem cells exist in adult brains, including humans, supporting potential regenerative therapies for neurological disorders. These findings inform interventions in dementia risk reduction and psychiatric treatments.
Reading Guide
Where to Start
"Neurogenesis in the adult human hippocampus" by Eriksson et al. (1998) is the first paper to read, as it provides foundational evidence of new neuron generation in the adult human brain using BrdU labeling in postmortem tissue, establishing the field's premise with 6253 citations.
Key Papers Explained
Reynolds and Weiss (1992) first isolated multipotent neural stem cells from adult mouse brain, generating neurons and astrocytes (5345 citations), foundational for Gage (2000) who mapped their persistence in adult mammalian regions including humans (4713 citations). Eriksson et al. (1998) extended this to human hippocampus (6253 citations), while Erickson et al. (2011) linked exercise-induced neurogenesis to hippocampal growth and memory (4574 citations), and Santarelli et al. (2003) showed its necessity for antidepressant behavioral effects (4246 citations).
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Current research builds on hippocampal neurogenesis evidence from Eriksson et al. (1998) and Gage (2000), exploring functional integration and therapeutic modulation as implied in Santarelli et al. (2003) and Erickson et al. (2011). Focus on neural stem cell regulation in neurogenic niches and astrocyte roles from Sofroniew and Vinters (2009). No recent preprints available.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | Epigenetic Regulations of GABAergic Neurotransmission: Relevan... | 2016 | Medical Epigenetics | 9.0K | ✓ |
| 2 | Neurogenesis in the adult human hippocampus | 1998 | Nature Medicine | 6.3K | ✓ |
| 3 | Generation of Neurons and Astrocytes from Isolated Cells of th... | 1992 | Science | 5.3K | ✕ |
| 4 | Cerebral organoids model human brain development and microcephaly | 2013 | Nature | 5.1K | ✓ |
| 5 | Astrocytes: biology and pathology | 2009 | Acta Neuropathologica | 5.0K | ✓ |
| 6 | Identification of a cancer stem cell in human brain tumors. | 2003 | PubMed | 4.9K | ✕ |
| 7 | Mammalian Neural Stem Cells | 2000 | Science | 4.7K | ✕ |
| 8 | Exercise training increases size of hippocampus and improves m... | 2011 | Proceedings of the Nat... | 4.6K | ✓ |
| 9 | Neurotrophins: Roles in Neuronal Development and Function | 2001 | Annual Review of Neuro... | 4.3K | ✓ |
| 10 | Requirement of Hippocampal Neurogenesis for the Behavioral Eff... | 2003 | Science | 4.2K | ✓ |
Frequently Asked Questions
What is adult neurogenesis in the human hippocampus?
Adult neurogenesis occurs in the human hippocampus, as shown by Eriksson et al. (1998) who identified new neurons in postmortem brains of cancer patients labeled with BrdU. This process involves generation of functional neurons from neural stem cells in the dentate gyrus. It contributes to hippocampal functions like memory formation.
How do neural stem cells generate new neurons and glia?
Reynolds and Weiss (1992) isolated cells from adult mouse striatum that proliferated in vitro into multipotent neural stem cells producing neurons and astrocytes. These cells self-renew and differentiate based on growth factors. Gage (2000) confirmed such stem cells persist in adult mammalian brains across regions.
What role does exercise play in hippocampal neurogenesis?
Erickson et al. (2011) found aerobic exercise increased hippocampal volume by 2% and improved memory in older adults. This links physical activity to enhanced neurogenesis and perfusion. Higher-fit adults show larger hippocampal volumes correlating with better cognition.
Why is hippocampal neurogenesis required for antidepressant effects?
Santarelli et al. (2003) used genetic and radiological methods to show disrupting antidepressant-induced hippocampal neurogenesis blocks behavioral responses in mice. Chronic antidepressants increase new neuron formation. This mechanism underlies their therapeutic impact on mood disorders.
What are the functions of astrocytes in neuroplasticity?
Sofroniew and Vinters (2009) describe astrocytes as tiling the CNS and supporting neuronal functions through reactive gliosis after insults. They outnumber neurons over fivefold and regulate synaptic plasticity. Astrocytes respond to all CNS injuries with complex protective and pathological roles.
How do neurotrophins influence neurogenesis?
Huang and Reichardt (2001) explain neurotrophins like BDNF activate Trk receptors to regulate neuronal development, maintenance, and synaptic plasticity. They promote survival and differentiation of new neurons. Neurotrophins also signal via p75NTR for diverse effects in the nervous system.
Open Research Questions
- ? How do epigenetic modifications precisely regulate GABAergic interneuron generation during adult neurogenesis?
- ? What molecular signals control the integration of newborn hippocampal neurons into existing circuits?
- ? Can targeted enhancement of adult neurogenesis restore cognitive deficits in aging or dementia models?
- ? What distinguishes neural stem cell quiescence from activation in neurogenic niches?
- ? How do astrocytes coordinate synaptic plasticity and neurogenesis in response to environmental stimuli like exercise?
Recent Trends
The field spans 61,343 works with sustained high citation impact from foundational papers like Eriksson et al. (1998, 6253 citations) on human hippocampal neurogenesis and Reynolds and Weiss (1992, 5345 citations) on adult stem cells.
Influential advancements include Erickson et al. (2011, 4574 citations) demonstrating exercise boosts hippocampal volume by 2%. No new preprints or news in last 6-12 months.
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