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Zhang T, Ding H, Wang Y, Yuan Z, Zhang Y, Chen G, Xu Y, Chen L. Akt3-mTOR regulates hippocampal neurogenesis in adult mouse. J Neurochem 2021; 159:498-511. [PMID: 34077553 DOI: 10.1111/jnc.15441] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2020] [Revised: 04/16/2021] [Accepted: 05/26/2021] [Indexed: 01/19/2023]
Abstract
Akt signaling has been associated with adult neurogenesis in the hippocampal dentate gyrus (DG). We reported cognitive dysfunction in Akt3 knockout (Akt3-KO) mice with the down-regulation of mTOR activation. However, little is known about the effects of Akt3 signaling on hippocampal neurogenesis. Herein, we show that progenitor cells, neuroblasts, and mature newborn neurons in hippocampal DG expressed Akt3 protein. The Akt3 phosphorylation in hippocampal DG was increased after voluntary wheel running for 7 days in wild-type mice (running WT mice), but not in Akt3-KO mice (running Akt3-KO mice). Subsequently, we observed that the proliferation of progenitor cells was suppressed in Akt3-KO mice and the mTOR inhibitor rapamycin-treated mice, whereas enhanced in running WT mice rather than running Akt3-KO mice. Neurite growth of neuroblasts was impaired in Akt3-KO mice and rapamycin-treated mice. In contrast, neither differentiation of progenitor cells nor migrating of newly generated neurons was altered in Akt3-KO mice or running WT mice. The levels of p70S6K and 4EBP1 phosphorylation were declined in Akt3-KO mice and elevated in running WT mice depending on mTOR activation. Furthermore, telomerase activity, telomere length, and expression of telomerase reverse transcriptase (TERT) were decreased in Akt3-KO mice but increased in running WT mice rather than running Akt3-KO mice, which required the mTOR activation. The study provides in vivo evidence that Akt3-mTOR signaling plays an important role in the proliferation of progenitor cells and neurite growth through positive regulated TERT expression and activation of p70S6K and 4EBP1.
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Affiliation(s)
- Tingting Zhang
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Hong Ding
- Department of Neurology, Nanjing Drum Tower Hospital Clinical College of Nanjing Medical University, Nanjing, China.,The Second Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Ya Wang
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Zihao Yuan
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Yajie Zhang
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Guiquan Chen
- State Key Laboratory of Pharmaceutical Biotechnology, MOE Key Laboratory of Model Animal for Disease Study, Model Animal Research Center, Nanjing University, Nanjing, China
| | - Yun Xu
- Department of Neurology, Nanjing Drum Tower Hospital Clinical College of Nanjing Medical University, Nanjing, China
| | - Ling Chen
- Department of Physiology, Nanjing Medical University, Nanjing, China
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2
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Abstract
Glutathione (GSH) is the most abundant non-protein thiol, and plays crucial roles in the antioxidant defense system and the maintenance of redox homeostasis in neurons. GSH depletion in the brain is a common finding in patients with neurodegenerative diseases, such as Alzheimer’s disease and Parkinson’s disease, and can cause neurodegeneration prior to disease onset. Excitatory amino acid carrier 1 (EAAC1), a sodium-dependent glutamate/cysteine transporter that is selectively present in neurons, plays a central role in the regulation of neuronal GSH production. The expression of EAAC1 is posttranslationally controlled by the glutamate transporter-associated protein 3–18 (GTRAP3-18) or miR-96-5p in neurons. The regulatory mechanism of neuronal GSH production mediated by EAAC1 may be a new target in therapeutic strategies for these neurodegenerative diseases. This review describes the regulatory mechanism of neuronal GSH production and its potential therapeutic application in the treatment of neurodegenerative diseases.
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McCaffrey TA, St Laurent G, Shtokalo D, Antonets D, Vyatkin Y, Jones D, Battison E, Nigg JT. Biomarker discovery in attention deficit hyperactivity disorder: RNA sequencing of whole blood in discordant twin and case-controlled cohorts. BMC Med Genomics 2020; 13:160. [PMID: 33115496 PMCID: PMC7594430 DOI: 10.1186/s12920-020-00808-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Accepted: 10/14/2020] [Indexed: 12/15/2022] Open
Abstract
Background A variety of DNA-based methods have been applied to identify genetic markers of attention deficit hyperactivity disorder (ADHD), but the connection to RNA-based gene expression has not been fully exploited. Methods Using well defined cohorts of discordant, monozygotic twins from the Michigan State University Twin Registry, and case-controlled ADHD cases in adolescents, the present studies utilized advanced single molecule RNA sequencing to identify expressed changes in whole blood RNA in ADHD. Multiple analytical strategies were employed to narrow differentially expressed RNA targets to a small set of potential biomarkers of ADHD.
Results RNA markers common to both the discordant twin study and case-controlled subjects further narrowed the putative targets, some of which had been previously associated with ADHD at the DNA level. The potential role of several differentially expressed genes, including ABCB5, RGS2, GAK, GIT1 and 3 members of the galactose metabolism pathway (GALE, GALT, GALK1) are substantiated by prior associations to ADHD and by established mechanistic connections to molecular pathways relevant to ADHD and behavioral control. Conclusions The convergence of DNA, RNA, and metabolic data suggests these may be promising targets for diagnostics and therapeutics in ADHD.
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Affiliation(s)
- Timothy A McCaffrey
- Division of Genomic Medicine, Department of Medicine, The George Washington University, 2300 Eye St., Washington, DC, 20037, USA. .,The St. Laurent Institute, Vancouver, WA, USA.
| | | | - Dmitry Shtokalo
- The St. Laurent Institute, Vancouver, WA, USA.,A.P. Ershov Institute of Informatics Systems, Novosibirsk, Russia.,AcademGene, LLC, Novosibirsk, Russia
| | - Denis Antonets
- A.P. Ershov Institute of Informatics Systems, Novosibirsk, Russia.,AcademGene, LLC, Novosibirsk, Russia
| | | | | | | | - Joel T Nigg
- Oregon Health and Science University, Portland, OR, USA
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Qin Y, An D, Xu W, Qi X, Wang X, Chen L, Chen L, Sha S. Estradiol Replacement at the Critical Period Protects Hippocampal Neural Stem Cells to Improve Cognition in APP/PS1 Mice. Front Aging Neurosci 2020; 12:240. [PMID: 32903757 PMCID: PMC7438824 DOI: 10.3389/fnagi.2020.00240] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Accepted: 07/10/2020] [Indexed: 12/17/2022] Open
Abstract
It has been suggested that there is a critical window for estrogen replacement therapy (ERT) in postmenopausal women with Alzheimer’s disease (AD); however, supporting evidence is lacking. To address this issue, we investigated the effective period for estradiol (E2) treatment using a mouse model of AD. Four-month-old female APPswe/PSEN1dE9 (APP/PS1) mice were ovariectomized (OVX) and treated with E2 for 2 months starting at the age of 4 months (early period), 6 months (mid-period), or 8 months (late period). We then evaluated hippocampal neurogenesis, β-amyloid (Aβ) accumulation, telomerase activity, and hippocampal-dependent behavior. Compared to age-matched wild type mice, APP/PS1 mice with intact ovaries showed increased proliferation of hippocampal neural stem cells (NSCs) at 8 months of age and decreased proliferation of NSCs at 10 months of age; meanwhile, Aβ accumulation progressively increased with age, paralleling the reduced survival of immature neurons. OVX-induced depletion of E2 in APP/PS1 mice resulted in elevated Aβ levels accompanied by elevated p75 neurotrophin receptor (p75NTR) expression and increased NSC proliferation at 6 months of age, which subsequently declined; accelerated reduction of immature neurons starting from 6 months of age, and reduced telomerase activity and worsened memory performance at 10 months of age. Treatment with E2 in the early period post-OVX, rather than in the mid or late period, abrogated these effects, and p75NTR inhibition reduced the overproliferation of NSCs in 6-month-old OVX-APP/PS1 mice. Thus, E2 deficiency in young APP/PS1 mice exacerbates cognitive deficits and depletes the hippocampal NSC pool in later life; this can be alleviated by E2 treatment in the early period following OVX, which prevents Aβ/p75NTR-induced NSC overproliferation and preserves telomerase activity.
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Affiliation(s)
- Yaoyao Qin
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Dong An
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Weixing Xu
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Xiuting Qi
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Xiaoli Wang
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Ling Chen
- Department of Physiology, Nanjing Medical University, Nanjing, China.,State Key Lab of Reproductive Medicine, Nanjing Medical University, Nanjing, China
| | - Lei Chen
- Department of Physiology, Nanjing Medical University, Nanjing, China
| | - Sha Sha
- Department of Physiology, Nanjing Medical University, Nanjing, China.,State Key Lab of Reproductive Medicine, Nanjing Medical University, Nanjing, China
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Zhong H, Rong J, Zhu C, Liang M, Li Y, Zhou R. Epigenetic Modifications of GABAergic Interneurons Contribute to Deficits in Adult Hippocampus Neurogenesis and Depression-Like Behavior in Prenatally Stressed Mice. Int J Neuropsychopharmacol 2020; 23:274-285. [PMID: 32211762 PMCID: PMC7177164 DOI: 10.1093/ijnp/pyaa020] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Revised: 03/15/2020] [Accepted: 03/19/2020] [Indexed: 01/07/2023] Open
Abstract
BACKGROUND Prenatal stress (PRS) is considered a risk factor for depressive disorder. Adult hippocampal neurogenesis is believed to play a role in the regulation of affective behaviors. GABAergic interneuron is a key modulator in adult hippocampal neurogenesis. Growing evidence indicates that PRS has adverse effects on adult hippocampal neurogenesis and DNA epigenetic modifications of the GABAergic system. The aim of this study was to investigate whether epigenetic GABAergic dysfunction participates in the negative impact of PRS on adult hippocampal neurogenesis and related emotional behaviors. METHODS Behavioral tests were used to explore PRS-induced depression-like behaviors of adult female mice. Immunohistochemistry staining, real-time reverse transcription-polymerase chain reaction, western blot, and chromatin immunoprecipitation were employed to detect adult neurogenesis and epigenetic changes of the GABAergic system in the hippocampus of PRS mice. RESULTS PRS mice developed a depression phenotype accompanied by the inhibited maturation of hippocampal newborn neurons. Compared with control mice, PRS mice showed decreased expression of glutamic acid decarboxylase 67 at the mRNA and protein levels. GABAA receptor agonist phenobarbital could rectify the decrease of 5-bromo-2-deoxyuridine/neuronal nuclei double-positive (BrdU+/NeuN+) cells in PRS mice. PRS mice also showed increased expression of DNA methyltransferase 1 and increased binding of DNA methyltransferase 1 to glutamic acid decarboxylase 67 promoter region. The treatment with DNA methyltransferase 1 inhibitor 5-aza-deoxycytidine restored the decrease of BrdU+/NeuN+ cells and depression-like behaviors in PRS mice via improving GABAergic system. CONCLUSIONS The present results indicate that epigenetic changes of the GABAergic system are responsible for adult hippocampus neurogenesis and depression-like behaviors in PRS mice.
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Affiliation(s)
- Haiquan Zhong
- Department of Physiology, Nanjing Medical University, Jiangsu, China
| | - Jing Rong
- Department of Physiology, Nanjing Medical University, Jiangsu, China
| | - Chunting Zhu
- Department of Physiology, Nanjing Medical University, Jiangsu, China
| | - Min Liang
- Department of Physiology, Nanjing Medical University, Jiangsu, China
| | - Yingchun Li
- Department of Physiology, Nanjing Medical University, Jiangsu, China
| | - Rong Zhou
- Department of Physiology, Nanjing Medical University, Jiangsu, China,Correspondence: Rong Zhou, PhD, Department of Physiology, Nanjing Medical University, Longmian Avenue 101, Jiangning District, Nanjing City, Jiangsu Province, China 211166 ()
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Liang M, Zhong H, Rong J, Li Y, Zhu C, Zhou L, Zhou R. Postnatal Lipopolysaccharide Exposure Impairs Adult Neurogenesis and Causes Depression-like Behaviors Through Astrocytes Activation Triggering GABAA Receptor Downregulation. Neuroscience 2019; 422:21-31. [DOI: 10.1016/j.neuroscience.2019.10.025] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Revised: 09/30/2019] [Accepted: 10/14/2019] [Indexed: 01/20/2023]
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Astrocytic JWA deletion exacerbates dopaminergic neurodegeneration by decreasing glutamate transporters in mice. Cell Death Dis 2018; 9:352. [PMID: 29500411 PMCID: PMC5834463 DOI: 10.1038/s41419-018-0381-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Revised: 02/01/2018] [Accepted: 02/05/2018] [Indexed: 12/29/2022]
Abstract
Astrocytic JWA exerts neuroprotective roles by alleviating oxidative stress and inhibiting inflammation. However, the molecular mechanisms of how astrocytic JWA is involved in dopaminergic neurodegeneration in Parkinson's disease (PD) remain largely unknown. In this study, we found that astrocyte-specific JWA knockout mice (JWA CKO) exacerbated dopamine (DA) neuronal loss and motor dysfunction, and reduced the levels of DA and its metabolites in a 1-methyl-4-phenyl-1, 2, 3, 6-tetrahydropyridine/probenecid (MPTP/p)-induced PD model. Astrocytic JWA deficiency repressed expression of excitatory amino-acid transporter 2 (GLT-1) and glutamate uptake both in vivo and in vitro. Further, the regulation of GLT-1 expression was involved in JWA-triggered activation of the MAPK and PI3K signaling pathways. JWA-increased GLT-1 expression was abolished by inhibitors of MEK and PI3K. Silencing CREB also abrogated JWA-increased GLT-1 expression and glutamate uptake. Additionally, JWA deficiency activated glial fibrillary acidic protein (GFAP), and increased the expression of STAT3. Similarly to the MPTP model, paraquat (PQ) exposure produced PD-like phenotypes in JWA CKO mice. Taken together, our findings provide novel insights into astrocytic JWA function in the pathogenesis of neurotoxin mouse models of PD.
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Zhao X, Wang R, Xiong J, Yan D, Li A, Wang S, Xu J, Zhou J. JWA antagonizes paraquat-induced neurotoxicity via activation of Nrf2. Toxicol Lett 2017; 277:32-40. [DOI: 10.1016/j.toxlet.2017.04.011] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Revised: 04/06/2017] [Accepted: 04/13/2017] [Indexed: 12/13/2022]
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de Oliveira MR, Chenet AL, Duarte AR, Scaini G, Quevedo J. Molecular Mechanisms Underlying the Anti-depressant Effects of Resveratrol: a Review. Mol Neurobiol 2017; 55:4543-4559. [PMID: 28695536 DOI: 10.1007/s12035-017-0680-6] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Accepted: 06/29/2017] [Indexed: 12/27/2022]
Abstract
Major depression is a public health problem, affecting 121 million people worldwide. Patients suffering from depression present high rates of morbidity, causing profound economic and social impacts. Furthermore, patients with depression present cognitive impairments, which could influence on treatment adherence and long-term outcomes. The pathophysiology of major depression is not completely understood yet but involves reduced levels of monoamine neurotransmitters, bioenergetics, and redox disturbances, as well as inflammation and neuronal loss. Treatment with anti-depressants provides a complete remission of symptoms in approximately 50% of patients with major depression. However, these drugs may cause side effects, as sedation and weight gain. In this context, there is increasing interest in studies focusing on the anti-depressant effects of natural compounds found in the diet. Resveratrol is a polyphenolic phytoalexin (3,4',5-trihydroxystilbene; C14H12O3; MW 228.247 g/mol) and has been found in peanuts, berries, grapes, and wine and induces anti-oxidant, anti-inflammatory, and anti-apoptotic effects in several mammalian cell types. Resveratrol also elicits anti-depressant effects, as observed in experimental models using animals. Therefore, resveratrol may be viewed as a potential anti-depressant agent, as well as may serve as a model of molecule to be modified aiming to ameliorate depressive symptoms in humans. In the present review, we describe and discuss the anti-depressant effects of resveratrol focusing on the mechanism of action of this phytoalexin in different experimental models.
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Affiliation(s)
- Marcos Roberto de Oliveira
- Programa de Pós-Graduação em Química, Departamento de Química (DQ), Instituto de Ciências Exatas e da Terra (ICET), Universidade Federal de Mato Grosso (UFMT), Av. Fernando Corrêa da Costa, 2367, Cuiabá, MT, CEP 78060-900, Brazil.
| | - Aline Lukasievicz Chenet
- Programa de Pós-Graduação em Química, Departamento de Química (DQ), Instituto de Ciências Exatas e da Terra (ICET), Universidade Federal de Mato Grosso (UFMT), Av. Fernando Corrêa da Costa, 2367, Cuiabá, MT, CEP 78060-900, Brazil
| | - Adriane Ribeiro Duarte
- Programa de Pós-Graduação em Química, Departamento de Química (DQ), Instituto de Ciências Exatas e da Terra (ICET), Universidade Federal de Mato Grosso (UFMT), Av. Fernando Corrêa da Costa, 2367, Cuiabá, MT, CEP 78060-900, Brazil
| | - Giselli Scaini
- Translational Psychiatry Program, Department of Psychiatry and Behavioral Sciences, McGovern Medical School, The University of Texas Health Science Center at Houston (UTHealth), Houston, TX, USA
| | - João Quevedo
- Translational Psychiatry Program, Department of Psychiatry and Behavioral Sciences, McGovern Medical School, The University of Texas Health Science Center at Houston (UTHealth), Houston, TX, USA
- Laboratory of Neurosciences, Graduate Program in Health Sciences, Health Sciences Unit, University of Southern Santa Catarina (UNESC), Criciúma, SC, Brazil
- Center of Excellence on Mood Disorders, Department of Psychiatry and Behavioral Sciences, McGovern Medical School, The University of Texas Health Science Center at Houston (UTHealth), Houston, TX, USA
- Neuroscience Graduate Program, |The University of Texas MD Anderson Cancer Center UTHealth Graduate School of Biomedical Sciences, Houston, TX, USA
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10
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Tian Y, Qi M, Hong Z, Li Y, Yuan Y, Du Y, Chen L, Chen L. Activation of Transient Receptor Potential Vanilloid 4 Promotes the Proliferation of Stem Cells in the Adult Hippocampal Dentate Gyrus. Mol Neurobiol 2016; 54:5768-5779. [PMID: 27660267 DOI: 10.1007/s12035-016-0113-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2016] [Accepted: 09/07/2016] [Indexed: 11/27/2022]
Abstract
Neurogenesis plays an important role in adult hippocampal function, and this process can be modulated by intracellular calcium. The activation of transient receptor potential vanilloid 4 (TRPV4) induces an increase in intracellular calcium concentration, but whether neurogenesis can be modulated by TRPV4 activation remains unclear. Here, we report that intracerebroventricular injection of the TRPV4 agonist GSK1016790A for 5 days enhanced the proliferation of stem cells in the hippocampal dentate gyrus (DG) of adult mice without affecting neurite growth, differentiation, or survival of newborn cells. GSK1016790A induced increases in the hippocampal protein levels of cyclin-dependent kinase (CDK) 6, CDK2, cyclin E1, and cyclin A2 but did not affect CDK4 and cyclin D1 expression. The phosphorylation of retinoblastoma protein (Rb) in hippocampi was enhanced in GSK1016790A-injected mice compared with control mice. Moreover, hippocampal protein levels of extracellular signal-regulated kinase 1/2 (ERK1/2) and p38 mitogen-activated protein kinase (p38 MAPK) phosphorylation were enhanced by GSK1016790A. Finally, GSK1016790A-enhanced proliferation was markedly blocked by a MAPK/ERK kinase or p38 MAPK antagonist (U0126 or SB203580, respectively). The increased protein levels of CDK2 and CDK6, as well as those of cyclin E1 and cyclin A2, in GSK1016790A-injected mice were substantially reduced by co-injection of U0126 or SB203580. We conclude that TRPV4 activation results in the proliferation of stem cells in the adult hippocampal DG, which is likely mediated through ERK1/2 and p38 MAPK signaling to increase the expression of CDKs (CDK6 and CDK2) and cyclins (cyclin E1 and A2), phosphorylate Rb consequently, and accelerate the cell cycle ultimately.
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Affiliation(s)
- Yujing Tian
- Department of Physiology, Nanjing Medical University, No. 140, Hanzhong Road, Nanjing, 210029, People's Republic of China
| | - Mengwen Qi
- Department of Physiology, Nanjing Medical University, No. 140, Hanzhong Road, Nanjing, 210029, People's Republic of China
| | - Zhiwen Hong
- Department of Physiology, Nanjing Medical University, No. 140, Hanzhong Road, Nanjing, 210029, People's Republic of China
| | - Yingchun Li
- Department of Physiology, Nanjing Medical University, No. 140, Hanzhong Road, Nanjing, 210029, People's Republic of China
| | - Yibiao Yuan
- The Laboratory Center for Basic Medical Sciences, Nanjing Medical University, Nanjing, 210029, People's Republic of China
| | - Yimei Du
- Research Center of Ion Channelopathy, Institute of Cardiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China
| | - Lei Chen
- Department of Physiology, Nanjing Medical University, No. 140, Hanzhong Road, Nanjing, 210029, People's Republic of China.
| | - Ling Chen
- Department of Physiology, Nanjing Medical University, No. 140, Hanzhong Road, Nanjing, 210029, People's Republic of China
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Zhang Z, Hong J, Zhang S, Zhang T, Sha S, Yang R, Qian Y, Chen L. Postpartum estrogen withdrawal impairs hippocampal neurogenesis and causes depression- and anxiety-like behaviors in mice. Psychoneuroendocrinology 2016; 66:138-49. [PMID: 26803529 DOI: 10.1016/j.psyneuen.2016.01.013] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Revised: 01/11/2016] [Accepted: 01/11/2016] [Indexed: 12/13/2022]
Abstract
Postpartum estrogen withdrawal is known to be a particularly vulnerable time for depressive symptoms. Ovariectomized adult mice (OVX-mice) treated with hormone-simulated pregnancy (HSP mice) followed by a subsequent estradiol benzoate (EB) withdrawal (EW mice) exhibited depression- and anxiety-like behaviors, as assessed by forced swim, tail suspension and elevated plus-maze, while HSP mice, OVX mice or EB-treated OVX mice (OVX/EB mice) did not. The survival and neurite growth of newborn neurons in hippocampal dentate gyrus were examined on day 5 after EW. Compared with controls, the numbers of 28-day-old BrdU(+) and BrdU(+)/NeuN(+) cells were increased in HSP mice but significantly decreased in EW mice; the numbers of 10-day-old BrdU(+) cells were increased in HSP mice and OVX/EB mice; and the density of DCX(+) fibers was reduced in EW mice and OVX mice. The phosphorylation of hippocampal NMDA receptor (NMDAr) NR2B subunit or Src was increased in HSP mice but decreased in EW mice. NMDAr agonist NMDA prevented the loss of 28-day-old BrdU(+) cells and the depression- and anxiety-like behaviors in EW mice. NR2B inhibitor Ro25-6981 or Src inhibitor dasatinib caused depression- and anxiety-like behaviors in HSP mice with the reduction of 28-day-old BrdU(+) cells. The hippocampal BDNF levels were reduced in EW mice and OVX mice. TrkB receptor inhibitor K252a reduced the density of DCX(+) fibers in HSP mice without the reduction of 28-day-old BrdU(+) cells, or the production of affective disorder. Collectively, these results indicate that postpartum estrogen withdrawal impairs hippocampal neurogenesis in mice that show depression- and anxiety-like behaviors.
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Affiliation(s)
- Zhuan Zhang
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing 86025, China; Department of Anesthesiology, Jiangsu Province Hospital, Nanjing Medical University, Nanjing 86025, China
| | - Juan Hong
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing 86025, China; Department of Physiology, Nanjing Medical University, Nanjing 86025, China
| | - Suyun Zhang
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing 86025, China
| | - Tingting Zhang
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing 86025, China; Department of Physiology, Nanjing Medical University, Nanjing 86025, China
| | - Sha Sha
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing 86025, China; Department of Physiology, Nanjing Medical University, Nanjing 86025, China
| | - Rong Yang
- Department of Obstetrics and Gynecology, Hangzhou First People's Hospital, Hangzhou 860571, China
| | - Yanning Qian
- Department of Anesthesiology, Jiangsu Province Hospital, Nanjing Medical University, Nanjing 86025, China
| | - Ling Chen
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing 86025, China; Department of Physiology, Nanjing Medical University, Nanjing 86025, China.
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12
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Li G, Zhou L, Zhu Y, Wang C, Sha S, Xian X, Ji Y, Liu G, Chen L. Seipin knockout in mice impairs stem cell proliferation and progenitor cell differentiation in the adult hippocampal dentate gyrus via reduced levels of PPARγ. Dis Model Mech 2015; 8:1615-24. [PMID: 26398946 PMCID: PMC4728316 DOI: 10.1242/dmm.021550] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Accepted: 09/14/2015] [Indexed: 12/16/2022] Open
Abstract
The seipin gene (BSCL2) was originally identified in humans as a loss-of-function gene associated with congenital generalized lipodystrophy type 2 (CGL2). Neuronal seipin-knockout (seipin-nKO) mice display a depression-like phenotype with a reduced level of hippocampal peroxisome proliferator-activated receptor gamma (PPARγ). The present study investigated the influence of seipin deficiency on adult neurogenesis in the hippocampal dentate gyrus (DG) and the underlying mechanisms of the effects. We show that the proliferative capability of stem cells in seipin-nKO mice was substantially reduced compared to in wild-type (WT) mice, and that this could be rescued by the PPARγ agonist rosiglitazone (rosi). In seipin-nKO mice, neuronal differentiation of progenitor cells was inhibited, with the enhancement of astrogliogenesis; both of these effects were recovered by rosi treatment during early stages of progenitor cell differentiation. In addition, rosi treatment could correct the decline in hippocampal ERK2 phosphorylation and cyclin A mRNA level in seipin-nKO mice. The MEK inhibitor U0126 abolished the rosi-rescued cell proliferation and cyclin A expression in seipin-nKO mice. In seipin-nKO mice, the hippocampal Wnt3 protein level was less than that in WT mice, and there was a reduction of neurogenin 1 (Neurog1) and neurogenic differentiation 1 (NeuroD1) mRNA, levels of which were corrected by rosi treatment. STAT3 phosphorylation (Tyr705) was enhanced in seipin-nKO mice, and was further elevated by rosi treatment. Finally, rosi treatment for 10 days could alleviate the depression-like phenotype in seipin-nKO mice, and this alleviation was blocked by the MEK inhibitor U0126. The results indicate that, by reducing PPARγ, seipin deficiency impairs proliferation and differentiation of neural stem and progenitor cells, respectively, in the adult DG, which might be responsible for the production of the depression-like phenotype in seipin-nKO mice.
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Affiliation(s)
- Guoxi Li
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing 210029, China Department of Physiology, Nanjing Medical University, Nanjing 210029, China
| | - Libin Zhou
- Department of Physiology, Nanjing Medical University, Nanjing 210029, China
| | - Ying Zhu
- Department of Physiology, Nanjing Medical University, Nanjing 210029, China
| | - Conghui Wang
- Department of Physiology, Nanjing Medical University, Nanjing 210029, China
| | - Sha Sha
- Department of Physiology, Nanjing Medical University, Nanjing 210029, China
| | - Xunde Xian
- Department of Molecular Genetics, UT Southwestern Medical Center, Dallas, TX 75390, USA
| | - Yong Ji
- Key Laboratory of Cardiovascular Disease and Molecular Intervention, Atherosclerosis Research Centre, Nanjing Medical University, Nanjing 210029, China
| | - George Liu
- Institute of Cardiovascular Sciences, Peking University, Beijing 100191, China
| | - Ling Chen
- State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing 210029, China Department of Physiology, Nanjing Medical University, Nanjing 210029, China
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Chen T, Wang C, Sha S, Zhou L, Chen L, Chen L. Simvastatin Enhances Spatial Memory and Long-Term Potentiation in Hippocampal CA1 via Upregulation of α7 Nicotinic Acetylcholine Receptor. Mol Neurobiol 2015. [DOI: 10.1007/s12035-015-9344-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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