scholarly journals Author response: Acute stress enhances adult rat hippocampal neurogenesis and activation of newborn neurons via secreted astrocytic FGF2

2013 ◽  
Author(s):  
Elizabeth D Kirby ◽  
Sandra E Muroy ◽  
Wayne G Sun ◽  
David Covarrubias ◽  
Megan J Leong ◽  
...  
Keyword(s):  
Acute Stress ◽  
Hippocampal Neurogenesis ◽  
Author Response ◽  
Adult Rat ◽  
Newborn Neurons

scholarly journals Acute stress enhances adult rat hippocampal neurogenesis and activation of newborn neurons via secreted astrocytic FGF2

eLife ◽  
2013 ◽  
Vol 2 ◽  
Author(s):  
Elizabeth D Kirby ◽  
Sandra E Muroy ◽  
Wayne G Sun ◽  
David Covarrubias ◽  
Megan J Leong ◽  
...  
Keyword(s):  
Basolateral Amygdala ◽  
Acute Stress ◽  
Memory Function ◽  
Brain Regions ◽  
Hippocampal Neurogenesis ◽  
Mammalian Brain ◽  
Stress Hormone ◽  
Adult Rat ◽  
Neural Stem Progenitor Cells ◽  
Newborn Neurons

Stress is a potent modulator of the mammalian brain. The highly conserved stress hormone response influences many brain regions, particularly the hippocampus, a region important for memory function. The effect of acute stress on the unique population of adult neural stem/progenitor cells (NPCs) that resides in the adult hippocampus is unclear. We found that acute stress increased hippocampal cell proliferation and astrocytic fibroblast growth factor 2 (FGF2) expression. The effect of acute stress occurred independent of basolateral amygdala neural input and was mimicked by treating isolated NPCs with conditioned media from corticosterone-treated primary astrocytes. Neutralization of FGF2 revealed that astrocyte-secreted FGF2 mediated stress-hormone-induced NPC proliferation. 2 weeks, but not 2 days, after acute stress, rats also showed enhanced fear extinction memory coincident with enhanced activation of newborn neurons. Our findings suggest a beneficial role for brief stress on the hippocampus and improve understanding of the adaptive capacity of the brain.

Is adult hippocampal neurogenesis really relevant for the treatment of psychiatric disorders?

2020 ◽  
Vol 18 ◽  
Author(s):  
Marco Carli ◽  
Stefano Aringhieri ◽  
Shivakumar Kolachalam ◽  
Biancamaria Longoni ◽  
Giovanna Grenno ◽  
...  
Keyword(s):  
Psychiatric Disorders ◽  
Emotional Processing ◽  
Imaging Techniques ◽  
Hippocampal Neurogenesis ◽  
Adult Brain ◽  
Adult Hippocampal Neurogenesis ◽  
Mood Stabilizers ◽  
Post Traumatic Stress ◽  
Newborn Neurons ◽  
Hippocampal Circuitry

: Adult neurogenesis consists in the generation of newborn neurons from neural stem cells taking place in the adult brain. In mammals, this process is limited to very few areas of the brain, and one of these neurogenic niches is the subgranular layer of the dentate gyrus (DG) of the hippocampus. Adult newborn neurons are generated from quiescent neural progenitors (QNPs), which differentiate through different steps into mature granule cells (GCs), to be finally integrated into the existing hippocampal circuitry. In animal models, adult hippocampal neurogenesis (AHN) is relevant for pattern discrimination, cognitive flexibility, emotional processing and resilience to stressful situations. Imaging techniques allow to visualize newborn neurons within the hippocampus through all their stages of development and differentiation. In humans, the evidence of AHN is more challenging, and, based on recent findings, it persists through the adulthood, even if it declines with age. Whether this process has an important role in human brain function and how it integrates into the existing hippocampal circuitry is still a matter of exciting debate. Importantly, AHN deficiency has been proposed to be relevant in many psychiatric disorders, including mood disorders, anxiety, post-traumatic stress disorder and schizophrenia. This review aims to investigate how AHN is altered in different psychiatric conditions and how pharmacological treatments can rescue this process. In fact, many psychoactive drugs, such as antidepressants, mood stabilizers and atypical antipsychotics (AAPs), can boost AHN with different results. In addition, some non-pharmacological approaches are discussed as well.

scholarly journals Stress-Related Dysfunction of Adult Hippocampal Neurogenesis—An Attempt for Understanding Resilience?

2021 ◽  
Vol 22 (14) ◽  
pp. 7339
Author(s):  
Julia Leschik ◽  
Beat Lutz ◽  
Antonietta Gentile
Keyword(s):  
Major Depression ◽  
Adult Neurogenesis ◽  
Current Knowledge ◽  
Functional Relation ◽  
Hippocampal Neurogenesis ◽  
Adult Hippocampal Neurogenesis ◽  
Special Focus ◽  
Extrinsic Cues ◽  
Health And Disease ◽  
Newborn Neurons

Newborn neurons in the adult hippocampus are regulated by many intrinsic and extrinsic cues. It is well accepted that elevated glucocorticoid levels lead to downregulation of adult neurogenesis, which this review discusses as one reason why psychiatric diseases, such as major depression, develop after long-term stress exposure. In reverse, adult neurogenesis has been suggested to protect against stress-induced major depression, and hence, could serve as a resilience mechanism. In this review, we will summarize current knowledge about the functional relation of adult neurogenesis and stress in health and disease. A special focus will lie on the mechanisms underlying the cascades of events from prolonged high glucocorticoid concentrations to reduced numbers of newborn neurons. In addition to neurotransmitter and neurotrophic factor dysregulation, these mechanisms include immunomodulatory pathways, as well as microbiota changes influencing the gut-brain axis. Finally, we discuss recent findings delineating the role of adult neurogenesis in stress resilience.

scholarly journals Long-Term Overconsumption of Sugar Starting at Adolescence Produces Persistent Hyperactivity and Neurocognitive Deficits in Adulthood

2021 ◽  
Vol 15 ◽  
Author(s):  
Kate Beecher ◽  
Ignatius Alvarez Cooper ◽  
Joshua Wang ◽  
Shaun B. Walters ◽  
Fatemeh Chehrehasa ◽  
...  
Keyword(s):  
Dietary Habits ◽  
Hippocampal Neurogenesis ◽  
Neurocognitive Deficits ◽  
Long Term Effects ◽  
Sugar Consumption ◽  
Food And Beverages ◽  
Increased Risk ◽  
Newborn Neurons ◽  
Dependent Learning

Sugar has become embedded in modern food and beverages. This has led to overconsumption of sugar in children, adolescents, and adults, with more than 60 countries consuming more than four times (>100 g/person/day) the WHO recommendations (25 g/person/day). Recent evidence suggests that obesity and impulsivity from poor dietary habits leads to further overconsumption of processed food and beverages. The long-term effects on cognitive processes and hyperactivity from sugar overconsumption, beginning at adolescence are not known. Using a well-validated mouse model of sugar consumption, we found that long-term sugar consumption, at a level that significantly augments weight gain, elicits an abnormal hyperlocomotor response to novelty and alters both episodic and spatial memory. Our results are similar to those reported in attention deficit and hyperactivity disorders. The deficits in hippocampal-dependent learning and memory were accompanied by altered hippocampal neurogenesis, with an overall decrease in the proliferation and differentiation of newborn neurons within the dentate gyrus. This suggests that long-term overconsumption of sugar, as that which occurs in the Western Diet might contribute to an increased risk of developing persistent hyperactivity and neurocognitive deficits in adulthood.

scholarly journals Haploinsufficiency of the psychiatric risk gene Cyfip1 causes abnormal postnatal hippocampal neurogenesis through microglial and Arp2/3 mediated actin dependent mechanisms

2018 ◽  
Author(s):  
Niels Haan ◽  
Laura J Westacott ◽  
Jenny Carter ◽  
Michael J Owen ◽  
William P Gray ◽  
...  
Keyword(s):  
Genetic Risk ◽  
Hippocampal Neurons ◽  
Hippocampal Neurogenesis ◽  
Actin Dynamics ◽  
Biological Processes ◽  
Risk Gene ◽  
A Cell ◽  
Adult Born Neurons ◽  
Newborn Neurons ◽  
And Migration

AbstractGenetic risk factors can significantly increase chances of developing psychiatric disorders, but the underlying biological processes through which this risk is effected remain largely unknown. Here we show that haploinsufficiency of Cyfip1, a candidate risk gene present in the pathogenic 15q11.2(BP1-BP2) deletion may impact on psychopathology via abnormalities in cell survival and migration of newborn neurons during postnatal hippocampal neurogenesis. We demonstrate that haploinsufficiency of Cyfip1 leads to increased numbers of adult born hippocampal neurons due to reduced apoptosis, without altering proliferation. We confirm this is due to a cell autonomous failure of microglia to induce apoptosis through the secretion of the appropriate factors. Furthermore, we show an abnormal migration of adult-born neurons due to altered Arp2/3 mediated actin dynamics. Together, our findings throw new light on how the genetic risk candidate Cyfip1 may influence the hippocampus, a brain region with strong evidence for involvement in psychopathology.

scholarly journals Live imaging of neurogenesis in the adult mouse hippocampus

Science ◽  
2018 ◽  
Vol 359 (6376) ◽  
pp. 658-662 ◽  
Author(s):  
Gregor-Alexander Pilz ◽  
Sara Bottes ◽  
Marion Betizeau ◽  
David J. Jörg ◽  
Stefano Carta ◽  
...  
Keyword(s):  
Adult Mouse ◽  
Hippocampal Neurogenesis ◽  
Cell Fates ◽  
Comprehensive Description ◽  
Mouse Hippocampus ◽  
Asymmetric Divisions ◽  
Stem And Progenitor Cells ◽  
Newborn Neurons ◽  
Insight Into

Neural stem and progenitor cells (NSPCs) generate neurons throughout life in the mammalian hippocampus. We used chronic in vivo imaging and followed genetically labeled individual NSPCs and their progeny in the mouse hippocampus for up to 2 months. We show that NSPCs targeted by the endogenous Achaete-scute homolog 1 (Ascl1) promoter undergo limited rounds of symmetric and asymmetric divisions, eliciting a burst of neurogenic activity, after which they are lost. Further, our data reveal unexpected asymmetric divisions of nonradial glia-like NSPCs. Cell fates of Ascl1-labeled lineages suggest a developmental-like program involving a sequential transition from a proliferative to a neurogenic phase. By providing a comprehensive description of lineage relationships, from dividing NSPCs to newborn neurons integrating into the hippocampal circuitry, our data offer insight into how NSPCs support life-long hippocampal neurogenesis.

Protective effects of melatonin against valproic acid-induced memory impairments and reductions in adult rat hippocampal neurogenesis

Neuroscience ◽  
2019 ◽  
Vol 406 ◽  
pp. 580-593 ◽  
Author(s):  
Anusara Aranarochana ◽  
Pornthip Chaisawang ◽  
Apiwat Sirichoat ◽  
Wanassanun Pannangrong ◽  
Peter Wigmore ◽  
...  
Keyword(s):  
Valproic Acid ◽  
Hippocampal Neurogenesis ◽  
Protective Effects ◽  
Memory Impairments ◽  
Adult Rat
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