1
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Tagliaferro M, Rosa P, Bellenchi GC, Bastianelli D, Trotta R, Tito C, Fazi F, Calogero A, Ponti D. Nucleolar localization of the ErbB3 receptor as a new target in glioblastoma. BMC Mol Cell Biol 2022; 23:13. [PMID: 35255831 PMCID: PMC8900349 DOI: 10.1186/s12860-022-00411-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Accepted: 02/14/2022] [Indexed: 12/12/2022] Open
Abstract
Background The nucleolus is a subnuclear, non-membrane bound domain that is the hub of ribosome biogenesis and a critical regulator of cell homeostasis. Rapid growth and division of cells in tumors are correlated with intensive nucleolar metabolism as a response to oncogenic factors overexpression. Several members of the Epidermal Growth Factor Receptor (EGFR) family, have been identified in the nucleus and nucleolus of many cancer cells, but their function in these compartments remains unexplored. Results We focused our research on the nucleolar function that a specific member of EGFR family, the ErbB3 receptor, plays in glioblastoma, a tumor without effective therapies. Here, Neuregulin 1 mediated proliferative stimuli, promotes ErbB3 relocalization from the nucleolus to the cytoplasm and increases pre-rRNA synthesis. Instead ErbB3 silencing or nucleolar stress reduce cell proliferation and affect cell cycle progression. Conclusions These data point to the existence of an ErbB3-mediated non canonical pathway that glioblastoma cells use to control ribosomes synthesis and cell proliferation. These results highlight the potential role for the nucleolar ErbB3 receptor, as a new target in glioblastoma. Supplementary Information The online version contains supplementary material available at 10.1186/s12860-022-00411-y.
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Affiliation(s)
- Marzia Tagliaferro
- Department of Medical-Surgical Sciences and Biotechnologies, University of Rome La Sapienza, Corso della Repubblica 79, 04100, Latina, Italy
| | - Paolo Rosa
- Department of Medical-Surgical Sciences and Biotechnologies, University of Rome La Sapienza, Corso della Repubblica 79, 04100, Latina, Italy
| | - Gian Carlo Bellenchi
- Institute of Genetics and Biophysics "Adriano Buzzati Traverso" CNR, 80131, Naples, Italy.,Fondazione Santa Lucia IRCCS, 00143, Rome, Italy.,Department of Systems Medicine, University of Tor Vergata, 00133, Rome, Italy
| | | | - Rosa Trotta
- Laboratory of Tumor Inflammation and Angiogenesis, Center for Cancer Biology (CCB), VIB, Leuven, Belgium.,Laboratory of Tumor Inflammation and Angiogenesis, and Department of Oncology, KU Leuven, Leuven, Belgium
| | - Claudia Tito
- Department of Anatomical, Histological, Forensic and Orthopaedic Sciences, Sapienza University of Rome, 00185, Rome, Italy
| | - Francesco Fazi
- Department of Anatomical, Histological, Forensic and Orthopaedic Sciences, Sapienza University of Rome, 00185, Rome, Italy
| | - Antonella Calogero
- Department of Medical-Surgical Sciences and Biotechnologies, University of Rome La Sapienza, Corso della Repubblica 79, 04100, Latina, Italy.,Istituto Chirurgico Ortopedico Traumatologico, 04100, Latina, Italy
| | - Donatella Ponti
- Department of Medical-Surgical Sciences and Biotechnologies, University of Rome La Sapienza, Corso della Repubblica 79, 04100, Latina, Italy. .,Laboratory of Tumor Inflammation and Angiogenesis, Center for Cancer Biology (CCB), VIB, Leuven, Belgium.
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2
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Extreme Glycemic Fluctuations Debilitate NRG1, ErbB Receptors and Olig1 Function: Association with Regeneration, Cognition and Mood Alterations During Diabetes. Mol Neurobiol 2021; 58:4727-4744. [PMID: 34165684 DOI: 10.1007/s12035-021-02455-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Accepted: 06/16/2021] [Indexed: 12/28/2022]
Abstract
Neuronal regeneration is crucial for maintaining intact neural interactions for perpetuation of cognitive and emotional functioning. The NRG1-ErbB receptor signaling is a key pathway for regeneration in adult brain and also associated with learning and mood stabilization by modulating synaptic transmission. Extreme glycemic stress is known to affect NRG1-ErbB-mediated regeneration in brain; yet, it remains unclear how the ErbB receptor subtypes are differentially affected due to such metabolic variations. Here, we assessed the alterations in NRG1, ErbB receptor subtypes to study the regenerative potential, both in rodents as well as in neuronal and glial cell models of hyperglycemia and hypoglycemic insults during hyperglycemia. The pro-oxidant and anti-oxidant status leading to degenerative changes in brain regions were determined. The spatial memory and anxiogenic behaviour of experimental rodents were tested using 'T' maze and Elevated Plus Maze. Our data revealed that the extreme glycemic discrepancies during diabetes and recurrent hypoglycemia lead to altered expression of NRG1, ErbB receptor subtypes, Syntaxin1 and Olig1 that shows association with impaired regeneration, synaptic dysfunction, demyelination, cognitive deficits and anxiety.
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3
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Guo W, Vandoorne T, Steyaert J, Staats KA, Van Den Bosch L. The multifaceted role of kinases in amyotrophic lateral sclerosis: genetic, pathological and therapeutic implications. Brain 2021; 143:1651-1673. [PMID: 32206784 PMCID: PMC7296858 DOI: 10.1093/brain/awaa022] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Revised: 11/23/2019] [Accepted: 12/11/2019] [Indexed: 02/07/2023] Open
Abstract
Amyotrophic lateral sclerosis is the most common degenerative disorder of motor neurons in adults. As there is no cure, thousands of individuals who are alive at present will succumb to the disease. In recent years, numerous causative genes and risk factors for amyotrophic lateral sclerosis have been identified. Several of the recently identified genes encode kinases. In addition, the hypothesis that (de)phosphorylation processes drive the disease process resulting in selective motor neuron degeneration in different disease variants has been postulated. We re-evaluate the evidence for this hypothesis based on recent findings and discuss the multiple roles of kinases in amyotrophic lateral sclerosis pathogenesis. We propose that kinases could represent promising therapeutic targets. Mainly due to the comprehensive regulation of kinases, however, a better understanding of the disturbances in the kinome network in amyotrophic lateral sclerosis is needed to properly target specific kinases in the clinic.
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Affiliation(s)
- Wenting Guo
- KU Leuven-University of Leuven, Department of Neurosciences, Experimental Neurology, and Leuven Brain Institute (LBI), Leuven, Belgium.,VIB, Center for Brain & Disease Research, Laboratory of Neurobiology, Leuven, Belgium.,KU Leuven-Stem Cell Institute (SCIL), Leuven, Belgium
| | - Tijs Vandoorne
- KU Leuven-University of Leuven, Department of Neurosciences, Experimental Neurology, and Leuven Brain Institute (LBI), Leuven, Belgium.,VIB, Center for Brain & Disease Research, Laboratory of Neurobiology, Leuven, Belgium
| | - Jolien Steyaert
- KU Leuven-University of Leuven, Department of Neurosciences, Experimental Neurology, and Leuven Brain Institute (LBI), Leuven, Belgium.,VIB, Center for Brain & Disease Research, Laboratory of Neurobiology, Leuven, Belgium
| | - Kim A Staats
- Department of Stem Cell Biology and Regenerative Medicine, University of Southern California, Los Angeles, California, USA
| | - Ludo Van Den Bosch
- KU Leuven-University of Leuven, Department of Neurosciences, Experimental Neurology, and Leuven Brain Institute (LBI), Leuven, Belgium.,VIB, Center for Brain & Disease Research, Laboratory of Neurobiology, Leuven, Belgium
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4
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Chen MK, Hsu JL, Hung MC. Nuclear receptor tyrosine kinase transport and functions in cancer. Adv Cancer Res 2020; 147:59-107. [PMID: 32593407 DOI: 10.1016/bs.acr.2020.04.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Signaling functions of plasma membrane-localized receptor tyrosine kinases (RTKs) have been extensively studied after they were first described in the mid-1980s. Plasma membrane RTKs are activated by extracellular ligands and cellular stress stimuli, and regulate cellular responses by activating the downstream effector proteins to initiate a wide range of signaling cascades in the cells. However, increasing evidence indicates that RTKs can also be transported into the intracellular compartments where they phosphorylate traditional effector proteins and non-canonical substrate proteins. In general, internalization that retains the RTK's transmembrane domain begins with endocytosis, and endosomal RTK remains active before being recycled or degraded. Further RTK retrograde transport from endosome-Golgi-ER to the nucleus is primarily dependent on membranes vesicles and relies on the interaction with the COP-I vesicle complex, Sec61 translocon complex, and importin. Internalized RTKs have non-canonical substrates that include transcriptional co-factors and DNA damage response proteins, and many nuclear RTKs harbor oncogenic properties and can enhance cancer progression. Indeed, nuclear-localized RTKs have been shown to positively correlate with cancer recurrence, therapeutic resistance, and poor prognosis of cancer patients. Therefore, understanding the functions of nuclear RTKs and the mechanisms of nuclear RTK transport will further improve our knowledge to evaluate the potential of targeting nuclear RTKs or the proteins involved in their transport as new cancer therapeutic strategies.
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Affiliation(s)
- Mei-Kuang Chen
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, United States; The University of Texas MD Anderson Cancer Center UTHealth Graduate School of Biomedical Sciences, Houston, TX, United States
| | - Jennifer L Hsu
- The University of Texas MD Anderson Cancer Center UTHealth Graduate School of Biomedical Sciences, Houston, TX, United States
| | - Mien-Chie Hung
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, United States; Graduate Institute of Biomedical Sciences, Research Center for Cancer Biology, and Center for Molecular Medicine, China Medical University, Taichung, Taiwan.
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5
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Paterson C, Cumming B, Law AJ. Temporal Dynamics of the Neuregulin-ErbB Network in the Murine Prefrontal Cortex across the Lifespan. Cereb Cortex 2020; 30:3325-3339. [PMID: 31897479 DOI: 10.1093/cercor/bhz312] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Neuregulin-ErbB signaling is essential for numerous functions in the developing, adult, and aging brain, particularly in the prefrontal cortex (PFC). Mouse models with disrupted Nrg and/or ErbB genes are relevant to psychiatric, developmental, and age-related disorders, displaying a range of abnormalities stemming from cortical circuitry impairment. Many of these models display nonoverlapping phenotypes dependent upon the gene target and timing of perturbation, suggesting that cortical expression of the Nrg-ErbB network undergoes temporal regulation across the lifespan. Here, we report a comprehensive temporal expression mapping study of the Nrg-ErbB signaling network in the mouse PFC across postnatal development through aging. We find that Nrg and ErbB genes display distinct expression profiles; moreover, splice isoforms of these genes are differentially expressed across the murine lifespan. We additionally find a developmental switch in ErbB4 splice isoform expression potentially mediated through coregulation of the lncRNA Miat expression. Our results are the first to comprehensively and quantitatively map the expression patterns of the Nrg-ErbB network in the mouse PFC across the postnatal lifespan and may help disentangle the pathway's involvement in normal cortical sequences of events across the lifespan, as well as shedding light on the pathophysiological mechanisms of abnormal Nrg-ErbB signaling in neurological disease.
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Affiliation(s)
- Clare Paterson
- Department of Psychiatry, University of Colorado, School of Medicine Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Brooke Cumming
- Department of Psychiatry, University of Colorado, School of Medicine Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Amanda J Law
- Department of Psychiatry, University of Colorado, School of Medicine Anschutz Medical Campus, Aurora, CO 80045, USA.,Department of Cell and Developmental Biology, University of Colorado, School of Medicine Anschutz Medical Campus, Aurora, CO 80045, USA.,Department of Medicine, University of Colorado, School of Medicine Anschutz Medical Campus, Aurora, CO 80045, USA
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6
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Ledonne A, Mercuri NB. On the Modulatory Roles of Neuregulins/ErbB Signaling on Synaptic Plasticity. Int J Mol Sci 2019; 21:ijms21010275. [PMID: 31906113 PMCID: PMC6981567 DOI: 10.3390/ijms21010275] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Revised: 12/27/2019] [Accepted: 12/29/2019] [Indexed: 12/14/2022] Open
Abstract
Neuregulins (NRGs) are a family of epidermal growth factor-related proteins, acting on tyrosine kinase receptors of the ErbB family. NRGs play an essential role in the development of the nervous system, since they orchestrate vital functions such as cell differentiation, axonal growth, myelination, and synapse formation. They are also crucially involved in the functioning of adult brain, by directly modulating neuronal excitability, neurotransmission, and synaptic plasticity. Here, we provide a review of the literature documenting the roles of NRGs/ErbB signaling in the modulation of synaptic plasticity, focusing on evidence reported in the hippocampus and midbrain dopamine (DA) nuclei. The emerging picture shows multifaceted roles of NRGs/ErbB receptors, which critically modulate different forms of synaptic plasticity (LTP, LTD, and depotentiation) affecting glutamatergic, GABAergic, and DAergic synapses, by various mechanisms. Further, we discuss the relevance of NRGs/ErbB-dependent synaptic plasticity in the control of brain processes, like learning and memory and the known involvement of NRGs/ErbB signaling in the modulation of synaptic plasticity in brain’s pathological conditions. Current evidence points to a central role of NRGs/ErbB receptors in controlling glutamatergic LTP/LTD and GABAergic LTD at hippocampal CA3–CA1 synapses, as well as glutamatergic LTD in midbrain DA neurons, thus supporting that NRGs/ErbB signaling is essential for proper brain functions, cognitive processes, and complex behaviors. This suggests that dysregulated NRGs/ErbB-dependent synaptic plasticity might contribute to mechanisms underlying different neurological and psychiatric disorders.
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Affiliation(s)
- Ada Ledonne
- Department of Experimental Neuroscience, Santa Lucia Foundation, Via del Fosso di Fiorano, no 64, 00143 Rome, Italy;
- Correspondence: ; Tel.: +3906-501703160; Fax: +3906-501703307
| | - Nicola B. Mercuri
- Department of Experimental Neuroscience, Santa Lucia Foundation, Via del Fosso di Fiorano, no 64, 00143 Rome, Italy;
- Department of Systems Medicine, University of Rome “Tor Vergata”, Via Montpellier no 1, 00133 Rome, Italy
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7
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Lopez-Font I, Sogorb-Esteve A, Javier-Torrent M, Brinkmalm G, Herrando-Grabulosa M, García-Lareu B, Turon-Sans J, Rojas-García R, Lleó A, Saura CA, Zetterberg H, Blennow K, Bosch A, Navarro X, Sáez-Valero J. Decreased circulating ErbB4 ectodomain fragments as a read-out of impaired signaling function in amyotrophic lateral sclerosis. Neurobiol Dis 2019; 124:428-438. [DOI: 10.1016/j.nbd.2018.12.021] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Revised: 12/06/2018] [Accepted: 12/26/2018] [Indexed: 02/07/2023] Open
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8
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Zheng J, Min S, Hu B, Liu Q, Wan Y. Nrdp1 is involved in hippocampus apoptosis in cardiopulmonary bypass-induced cognitive dysfunction via the regulation of ErbB3 protein levels. Int J Mol Med 2019; 43:1747-1757. [PMID: 30720051 PMCID: PMC6414174 DOI: 10.3892/ijmm.2019.4080] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Accepted: 01/17/2019] [Indexed: 12/19/2022] Open
Abstract
The cardiopulmonary bypass (CPB) is an important risk factor for the development of postoperative cognitive dysfunction (POCD). The pathological mechanism of the neuro-modulation receptor degradation protein ring finger protein 41 (Nrdp1) in CPB-induced cognitive dysfunction remains unclear. In the present study, aged Sprague-Dawley male rats and CPB treatment were selected to duplicate the POCD model. A hypoxia/reoxygeneration (H/R) model was established to evaluate the effect of Nrdp1 in vitro. Apoptosis in the hippocampus regions were measured using a terminal deoxynucleotidyl-transferase-mediated dUTP nick end labelling assay, the viability and apoptosis level of the cells were measured via an MTT assay and flow cytometry, respectively, and the expression levels of Nrdp1, erb-b2 receptor tyrosine kinase 3 (ErbB3), phosphorylated-protein kinase B (p-AKT) and cleaved (c-) caspase-3 were detected using western blot analysis. Then, Nrdp1 was upregulated and downregulated in vitro and in vivo through lentivirus infection to further investigate the effect of Nrdp1 in the rats following CPB. The results revealed that Nrdp1 is associated with hippocampus neuronal apoptosis and POCD following CPB in rats. The overexpression of Nrdp1 altered the cognitive function of the rats which was inhibited by CPB, and additionally inhibited the viability and increased the apoptosis of primary hippocampus neuron cells under H/R treatment. Furthermore, knockdown of Nrdp1 promoted the viability of primary hippocampus neuron cells and decreased the apoptosis of cells under H/R treatment. Further study indicated that Nrdp1 regulates the protein expression of ErbB3, p-AKT, cytochrome c, BCL2-associated X, apoptosis regulator, BCL2, apoptosis regulator and c-caspase-3. The results of the present study suggested that CPB may induce apoptosis in the hippocampus of aged rats. Nrdp1 serves an important role in regulating the apoptosis induced by CPB in vivo and in vitro through regulating ErbB3 and p-AKT protein levels.
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Affiliation(s)
- Jie Zheng
- Department of Anesthesiology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China
| | - Su Min
- Department of Anesthesiology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China
| | - Bin Hu
- Department of Anesthesiology, Traditional Chinese Medicine Hospital Affiliated to Southwest Medical University, Luzhou, Sichuan 640000, P.R. China
| | - Qin Liu
- Department of Anesthesiology, Traditional Chinese Medicine Hospital Affiliated to Southwest Medical University, Luzhou, Sichuan 640000, P.R. China
| | - Yunqiang Wan
- Department of Anesthesiology, The First Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, P.R. China
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9
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Zhou X, Wang Z, Huang B, Yuan S, Sheng X, Yu L, Meng G, Wang Y, Po SS, Jiang H. Regulation of the NRG1/ErbB4 Pathway in the Intrinsic Cardiac Nervous System Is a Potential Treatment for Atrial Fibrillation. Front Physiol 2018; 9:1082. [PMID: 30246788 PMCID: PMC6110946 DOI: 10.3389/fphys.2018.01082] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Accepted: 07/20/2018] [Indexed: 12/02/2022] Open
Abstract
Background: The NRG1/ErbB4 signaling mechanism has been widely studied in the central nervous system for many years. However, the role of this pathway in modulating the intrinsic cardiac nervous system is largely unknown. Objective: The present study investigated whether the NRG1/ErbB4 signaling system affects the activity of major atrial ganglionated plexi (GP) in a paroxysmal atrial fibrillation (AF) model by 6-h rapid atrial pacing (RAP). Methods: Twenty-four dogs were randomly divided into (1) a control group (saline microinjections into GP), (2) RAP group (saline microinjections into GP plus 6 h-RAP), (3) NRG1 group (microinjections of neuregulin-1 into GP plus 6 h-RAP) and (4) NRG1 + ERA group (microinjections of neuregulin-1 and ErbB4 receptor antagonist-ERA into GP plus 6 h-RAP). The effective refractory period (ERP), window of vulnerability (WOV), anterior right GP (ARGP) function and neural activity were measured. ARGP tissues were excised for histological study and western blotting. Results: When compared to the control group, 6 h-RAP produced a significant (1) decrease in ERP, an increase in ΣWOV, (2) an increase in ARGP neural activity and neural function, and (3) an increase in c-fos and nerve growth factor protein expression in the ARGP. However, microinjection of NRG1 into the ARGP prior to RAP prevented ERP shortening and AGRP activity enhancement and inhibited the expression of c-Fos and NGF proteins. Furthermore, these changes were significantly attenuated by pretreatment with an ErbB4 receptor antagonist. Conclusion: The NRG1/ErbB4 signaling pathway may exist in the GP, and activation of this pathway suppressed RAP-induced GP activation, atrial electrical remodeling and AF.
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Affiliation(s)
- Xiaoya Zhou
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China
| | - Zhuo Wang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China
| | - Bing Huang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China
| | - Shenxu Yuan
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China
| | - Xia Sheng
- Sir Run Run Shaw Institution of Clinical Medicine and Department of Cardiology, Sir Run Run Shaw Hospital Affiliated to Medical College of Zhejiang University, Hangzhou, China
| | - Lilei Yu
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China
| | - Guannan Meng
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China
| | - Yuhong Wang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China
| | - Sunny S Po
- Heart Rhythm Institute, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
| | - Hong Jiang
- Department of Cardiology, Renmin Hospital of Wuhan University, Wuhan, China
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10
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Chandrasekar A, Olde Heuvel F, Wepler M, Rehman R, Palmer A, Catanese A, Linkus B, Ludolph A, Boeckers T, Huber-Lang M, Radermacher P, Roselli F. The Neuroprotective Effect of Ethanol Intoxication in Traumatic Brain Injury Is Associated with the Suppression of ErbB Signaling in Parvalbumin-Positive Interneurons. J Neurotrauma 2018; 35:2718-2735. [PMID: 29774782 DOI: 10.1089/neu.2017.5270] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Ethanol intoxication (EI) is a frequent comorbidity of traumatic brain injury (TBI), but the impact of EI on TBI pathogenic cascades and prognosis is unclear. Although clinical evidence suggests that EI may have neuroprotective effects, experimental support is, to date, inconclusive. We aimed at elucidating the impact of EI on TBI-associated neurological deficits, signaling pathways, and pathogenic cascades in order to identify new modifiers of TBI pathophysiology. We have shown that ethanol administration (5 g/kg) before trauma enhances behavioral recovery in a weight-drop TBI model. Neuronal survival in the injured somatosensory cortex was also enhanced by EI. We have used phospho-receptor tyrosine kinase (RTK) arrays to screen the impact of ethanol on TBI-induced activation of RTK in somatosensory cortex, identifying ErbB2/ErbB3 among the RTKs activated by TBI and suppressed by ethanol. Phosphorylation of ErbB2/3/4 RTKs were upregulated in vGlut2+ excitatory synapses in the injured cortex, including excitatory synapses located on parvalbumin (PV)-positive interneurons. Administration of selective ErbB inhibitors was able to recapitulate, to a significant extent, the neuroprotective effects of ethanol both in sensorimotor performance and structural integrity. Further, suppression of PV interneurons in somatosensory cortex before TBI, by engineered receptors with orthogonal pharmacology, could mimic the beneficial effects of ErbB inhibitors. Thus, we have shown that EI interferes with TBI-induced pathogenic cascades at multiple levels, with one prominent pathway, involving ErbB-dependent modulation of PV interneurons.
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Affiliation(s)
| | | | - Martin Wepler
- 2 Institute of Anesthesiological Pathophysiology and Process Engineering, Ulm University , Ulm, Germany
| | - Rida Rehman
- 1 Department of Neurology, Ulm University , Ulm, Germany
| | - Annette Palmer
- 3 Institute of Clinical and Experimental Trauma-Immunology, Ulm University , Ulm, Germany
| | - Alberto Catanese
- 4 Department of Anatomy and Cell Biology, Ulm University , Ulm, Germany
| | - Birgit Linkus
- 1 Department of Neurology, Ulm University , Ulm, Germany
| | - Albert Ludolph
- 1 Department of Neurology, Ulm University , Ulm, Germany
| | - Tobias Boeckers
- 4 Department of Anatomy and Cell Biology, Ulm University , Ulm, Germany
| | - Markus Huber-Lang
- 3 Institute of Clinical and Experimental Trauma-Immunology, Ulm University , Ulm, Germany
| | - Peter Radermacher
- 2 Institute of Anesthesiological Pathophysiology and Process Engineering, Ulm University , Ulm, Germany
| | - Francesco Roselli
- 1 Department of Neurology, Ulm University , Ulm, Germany .,4 Department of Anatomy and Cell Biology, Ulm University , Ulm, Germany
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11
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Ledonne A, Mango D, Latagliata EC, Chiacchierini G, Nobili A, Nisticò R, D'Amelio M, Puglisi-Allegra S, Mercuri NB. Neuregulin 1/ErbB signalling modulates hippocampal mGluRI-dependent LTD and object recognition memory. Pharmacol Res 2018; 130:12-24. [PMID: 29427771 DOI: 10.1016/j.phrs.2018.02.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Revised: 01/19/2018] [Accepted: 02/02/2018] [Indexed: 01/05/2023]
Abstract
The neurotrophic factors neuregulins (NRGs) and their receptors, ErbB tyrosine kinases, regulate neurotransmission, synaptic plasticity and cognitive functions and their alterations have been associated to different neuropsychiatric disorders. Group 1 metabotropic glutamate receptors (mGluRI)-dependent mechanisms are also altered in animal models of neuropsychiatric diseases, especially mGluRI-induced glutamatergic long-term depression (mGluRI-LTD), a form of synaptic plasticity critically involved in learning and memory. Despite this evidence, a potential link between NRGs/ErbB signalling and mGluRI-LTD has never been considered. Here, we aimed to test the hypothesis that NRGs/ErbB signalling regulates mGluRI functions in the hippocampus, thus controlling CA1 pyramidal neurons excitability and synaptic plasticity as well as mGluRI-dependent behaviors. We investigated the functional interaction between NRG1/ErbB signalling and mGluRI in hippocampal CA1 pyramidal neurons, by analyzing the effect of a pharmacological modulation of NRG1/ErbB signalling on the excitation of pyramidal neurons and on the LTD at CA3-CA1 synapses induced by an mGluRI agonist. Furthermore, we verified the involvement of ErbB signalling in mGluRI-dependent learning processes, by evaluating the consequence of an intrahippocampal in vivo injection of a pan-ErbB inhibitor in the object recognition test in mice, a learning task dependent on hippocampal mGluRI. We found that NRG1 potentiates mGluRI-dependent functions on pyramidal neurons excitability and synaptic plasticity at CA3-CA1 synapses. Further, endogenous ErbB signalling per se regulates, through mGluRI, neuronal excitability and LTD in CA1 pyramidal neurons, since ErbB inhibition reduces mGluRI-induced neuronal excitation and mGluRI-LTD. In vivo intrahippocampal injection of the ErbB inhibitor, PD158780, impairs mGluRI-LTD at CA3-CA1 synapses and affects the exploratory behavior in the object recognition test. Thus, our results identify a key role for NRG1/ErbB signalling in the regulation of hippocampal mGluRI-dependent synaptic and cognitive functions, whose alteration might contribute to the pathogenesis of different brain diseases.
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Affiliation(s)
- Ada Ledonne
- Department of Experimental Neuroscience, Santa Lucia Foundation, Rome, Italy.
| | - Dalila Mango
- Pharmacology of Synaptic Disease Lab, European Brain Research Institute, Rome, Italy
| | | | - Giulia Chiacchierini
- Department of Psychology and "Daniel Bovet" Center, University "La Sapienza", Rome, Italy
| | - Annalisa Nobili
- Department of Experimental Neuroscience, Santa Lucia Foundation, Rome, Italy; Department of Medicine, University Campus-Biomedico, Rome, Italy
| | - Robert Nisticò
- Pharmacology of Synaptic Disease Lab, European Brain Research Institute, Rome, Italy; Department of Biology, University of Rome "Tor Vergata", Rome, Italy
| | - Marcello D'Amelio
- Department of Experimental Neuroscience, Santa Lucia Foundation, Rome, Italy; Department of Medicine, University Campus-Biomedico, Rome, Italy
| | - Stefano Puglisi-Allegra
- Department of Experimental Neuroscience, Santa Lucia Foundation, Rome, Italy; Department of Psychology and "Daniel Bovet" Center, University "La Sapienza", Rome, Italy
| | - Nicola Biagio Mercuri
- Department of Experimental Neuroscience, Santa Lucia Foundation, Rome, Italy; Department of Systems Medicine, University of Rome "Tor Vergata", Rome, Italy
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12
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Abstract
Breast cancer affects approximately 1 in 8 women, and it is estimated that over 246,660 women in the USA will be diagnosed with breast cancer in 2016. Breast cancer mortality has decline over the last two decades due to early detection and improved treatment. Over the last few years, there is mounting evidence to demonstrate the prominent role of receptor tyrosine kinases (RTKs) in tumor initiation and progression, and targeted therapies against the RTKs have been developed, evaluated in clinical trials, and approved for many cancer types, including breast cancer. However, not all breast cancers are the same as evidenced by the multiple subtypes of the disease, with some more aggressive than others, showing differential treatment response to different types of drugs. Moreover, in addition to canonical signaling from the cell surface, many RTKs can be trafficked to various subcellular compartments, e.g., the multivesicular body and nucleus, where they carry out critical cellular functions, such as cell proliferation, DNA replication and repair, and therapeutic resistance. In this review, we provide a brief summary on the role of a selected number of RTKs in breast cancer and describe some mechanisms of resistance to targeted therapies.
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Affiliation(s)
- Jennifer L Hsu
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX, 77030, USA.,Center for Molecular Medicine and Graduate Institute of Cancer Biology, China Medical University, Taichung, 404, Taiwan.,Department of Biotechnology, Asia University, Taichung, 413, Taiwan
| | - Mien-Chie Hung
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX, 77030, USA. .,Center for Molecular Medicine and Graduate Institute of Cancer Biology, China Medical University, Taichung, 404, Taiwan. .,Department of Biotechnology, Asia University, Taichung, 413, Taiwan.
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Koleck TA, Bender CM, Sereika SM, Ryan CM, Ghotkar P, Brufsky AM, Jankowitz RC, McAuliffe PF, Clark BZ, Conley YP. Associations between pathologic tumor features and preadjuvant therapy cognitive performance in women diagnosed with breast cancer. Cancer Med 2017; 6:339-348. [PMID: 28083945 PMCID: PMC5313647 DOI: 10.1002/cam4.964] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Revised: 09/27/2016] [Accepted: 10/23/2016] [Indexed: 12/13/2022] Open
Abstract
Intertumor heterogeneity has been proposed as a potential mechanism to account for variability in cognitive performance in women diagnosed with breast cancer. The purpose of this study was to explore associations between variation in pathologic tumor features (PTFs) and variability in preadjuvant therapy cognitive performance in postmenopausal women newly diagnosed with early-stage breast cancer. Participants (N = 329) completed a comprehensive battery of neuropsychological tests to evaluate cognitive performance after primary surgery but prior to initiation of adjuvant anastrozole±chemotherapy. PTF data were abstracted from medical records. Robust multiple linear regression models were fit to estimate associations between individual PTFs and the cognitive function composite domain scores. All models controlled for age, estimated intelligence, and levels of depressive symptoms, anxiety, fatigue, and pain. Diagnosis of a HER2-positive tumor contributed to poorer verbal (b = -0.287, P = 0.018), visual (b = -0.270, P = 0.001), and visual working (b = -0.490, P < 0.001) memory performance compared to diagnosis of a HER2-negative tumor. Similarly, as HER2 immunohistochemistry classification score increased, verbal (b = -0.072, P = 0.093), visual (b = -0.081, P = 0.003), and visual working (b = -0.170, P < 0.001) memory performance score decreased. Associations with performance were also noted between location, focality/centricity, hormone receptor expression, cellular proliferation (i.e., Ki67), and Oncotype DX® Breast Cancer Assay Recurrence Score® .) Our results suggest that certain PTFs related to more aggressive tumor phenotypes or inferior breast cancer prognosis may be implicated in poorer preadjuvant therapy cognitive performance. Follow-up studies that include a cognitive assessment before primary surgery should be conducted to further delineate the role of intertumor heterogeneity on cognitive performance.
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Affiliation(s)
- Theresa A. Koleck
- University of Pittsburgh School of NursingPittsburghPennsylvania
- Columbia University School of NursingNew YorkNew York
| | | | - Susan M. Sereika
- University of Pittsburgh School of NursingPittsburghPennsylvania
- Departments of Biostatistics and EpidemiologyUniversity of Pittsburgh Graduate School of Public HealthPittsburghPennsylvania
| | - Christopher M. Ryan
- Department of PsychiatryUniversity of California San FranciscoSan FranciscoCalifornia
- Department of PsychiatryUniversity of PittsburghPittsburghPennsylvania
| | - Puja Ghotkar
- University of Pittsburgh School of NursingPittsburghPennsylvania
| | - Adam M. Brufsky
- Division of Hematology/OncologyMagee‐Womens Hospital of UPMCPittsburghPennsylvania
- University of Pittsburgh Cancer InstitutePittsburghPennsylvania
- University of Pittsburgh School of MedicinePittsburghPennsylvania
| | - Rachel C. Jankowitz
- University of Pittsburgh Cancer InstitutePittsburghPennsylvania
- University of Pittsburgh School of MedicinePittsburghPennsylvania
- Magee‐Womens Hospital of UPMCCancerCenterPittsburghPennsylvania
| | - Priscilla F. McAuliffe
- University of Pittsburgh Cancer InstitutePittsburghPennsylvania
- University of Pittsburgh School of MedicinePittsburghPennsylvania
- Division of Breast Surgical OncologyMagee‐Womens Hospital of UPMCPittsburghPennsylvania
| | - Beth Z. Clark
- University of Pittsburgh School of MedicinePittsburghPennsylvania
- Division of Gynecologic PathologyMagee‐Womens Hospital of UPMCPittsburghPennsylvania
| | - Yvette P. Conley
- University of Pittsburgh School of NursingPittsburghPennsylvania
- Department of Human GeneticsUniversity of Pittsburgh Graduate School of Public HealthPittsburghPennsylvania
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Mostaid MS, Lloyd D, Liberg B, Sundram S, Pereira A, Pantelis C, Karl T, Weickert CS, Everall IP, Bousman CA. Neuregulin-1 and schizophrenia in the genome-wide association study era. Neurosci Biobehav Rev 2016; 68:387-409. [DOI: 10.1016/j.neubiorev.2016.06.001] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Revised: 05/30/2016] [Accepted: 06/03/2016] [Indexed: 12/22/2022]
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15
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Gao R, Penzes P. Common mechanisms of excitatory and inhibitory imbalance in schizophrenia and autism spectrum disorders. Curr Mol Med 2015; 15:146-67. [PMID: 25732149 DOI: 10.2174/1566524015666150303003028] [Citation(s) in RCA: 327] [Impact Index Per Article: 36.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Revised: 12/20/2014] [Accepted: 01/18/2015] [Indexed: 12/16/2022]
Abstract
Autism Spectrum Disorders (ASD) and Schizophrenia (SCZ) are cognitive disorders with complex genetic architectures but overlapping behavioral phenotypes, which suggests common pathway perturbations. Multiple lines of evidence implicate imbalances in excitatory and inhibitory activity (E/I imbalance) as a shared pathophysiological mechanism. Thus, understanding the molecular underpinnings of E/I imbalance may provide essential insight into the etiology of these disorders and may uncover novel targets for future drug discovery. Here, we review key genetic, physiological, neuropathological, functional, and pathway studies that suggest alterations to excitatory/inhibitory circuits are keys to ASD and SCZ pathogenesis.
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Affiliation(s)
| | - P Penzes
- Department of Physiology, Department of Psychiatry and Behavioral Sciences, Northwestern University Feinberg School of Medicine, 303 E. Chicago Avenue, Chicago, IL 60611, USA.
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The Soluble Heparin-Binding EGF-Like Growth Factor Stimulates EGF Receptor Trafficking to the Nucleus. PLoS One 2015; 10:e0127887. [PMID: 26016774 PMCID: PMC4446362 DOI: 10.1371/journal.pone.0127887] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2014] [Accepted: 04/20/2015] [Indexed: 12/04/2022] Open
Abstract
Most ligands of epidermal growth factor receptor (EGFR) have the ability to induce EGFR translocation into the nucleus, where EGFR acts as an important transcriptional regulator. Soluble form of heparin-binding EGF-like growth factor (sHB-EGF) is one of the ligands for EGFR in many cell types; however, there is no evidence for the ability of sHB-EGF to induce EGFR nuclear importation. Here, we demonstrated that treatment of A431 cells with sHB-EGF resulted in nuclear localization of EGFR and such translocation occurs via retrograde pathway. It was shown by confocal microscopy and co-immunoprecipitation assay that the translocation complex consisted of both ligand and receptor. The chromatin immunoprecipitation assay showed the association of sHB-EGF–EGFR complex with promoter region of cyclin D1 in the cell nucleus and this association was prevented by application of EGFR kinase inhibitor AG-1478. The obtained data suggest that sHB-EGF acts similarly to other EGFR ligands and is capable to induce EGFR nuclear translocation as a part of ligand-receptor complex in a tyrosine phosphorylation-dependent manner.
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Abstract
ABSTRACT Cancers exhibit differences in metastatic behavior and drug sensitivity that correlate with certain tumor-specific variables such as differentiation grade, growth rate/extent and molecular regulatory aberrations. In practice, patient management is based on the past results of clinical trials adjusted for these biomarkers. Here, it is proposed that treatment strategies could be fine-tuned upfront simply by quantifying tumorigenic spatial (cell growth) and temporal (genetic stability) control losses, as predicted by genetic defects of cell-cycle-regulatory gatekeeper and genome-stabilizing caretaker tumor suppressor genes, respectively. These differential quantifications of tumor dysfunction may in turn be used to create a tumor-specific ‘periodic table’ that guides rational formulation of survival-enhancing anticancer treatment strategies.
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Affiliation(s)
- Richard J Epstein
- *Clinical Informatics & Research Centre, The Kinghorn Cancer Centre, 370 Victoria St, Darlinghurst 2010, Sydney, Australia
- Laboratory of Genome Evolution, Garvan Institute for Medical Research, 384 Victoria St, Darlinghurst 2010, Sydney, Australia
- Department of Oncology, & UNSW Clinical School, St Vincent's Hospital, 390 Victoria St, Darlinghurst 2010 Sydney, Australia
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Joshi D, Fullerton JM, Weickert CS. Elevated ErbB4 mRNA is related to interneuron deficit in prefrontal cortex in schizophrenia. J Psychiatr Res 2014; 53:125-32. [PMID: 24636039 DOI: 10.1016/j.jpsychires.2014.02.014] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/24/2013] [Revised: 02/17/2014] [Accepted: 02/17/2014] [Indexed: 12/18/2022]
Abstract
Neuregulin 1 and its receptor ErbB4 are confirmed risk genes for schizophrenia, but the neuropathological alterations in NRG1-ErbB4 in schizophrenia are unclear. The present investigations therefore focused on determining lamina specific (ErbB4-pan) and quantitative (pan, JMa, JMb, CYT1 and CYT2) ErbB4 mRNA changes in the dorsolateral prefrontal cortex (DLPFC) in schizophrenia. We also determined which neuronal profiles are ErbB4 mRNA+ in the human DLPFC and the relationship between ErbB4 and interneuron marker mRNAs. In situ hybridisation and quantitative PCR measurements were performed to determine changes in ErbB4 splice variant mRNA levels in the DLPFC in schizophrenia (n = 37) compared to control (n = 37) subjects. Cortical neurons expressing ErbB4-pan were labelled with silver grain clusters. Correlations were performed between ErbB4 and interneuron mRNA levels. ErbB4-pan mRNA was significantly increased (layers I, II and V) in the DLPFC in schizophrenia. Silver grain clusters for ErbB4-pan were detected predominantly over small-medium neurons with low-no expression in the larger, paler, more triangular neuronal profiles. ErbB4-JMa mRNA expression was increased in schizophrenia. Somatostatin, neuropeptide Y and vasoactive intestinal peptide mRNAs negatively correlated with ErbB4-JMa mRNA in people with schizophrenia. Our findings demonstrate that ErbB4-pan laminar mRNA expression is elevated (layers I, II, V) in schizophrenia. At the cellular level, ErbB4-pan mRNA+ signal was detected predominantly in interneuron-like neurons. We provide evidence from this independent Australian postmortem cohort that ErbB4-JMa expression is elevated in schizophrenia and is linked to deficits in dendrite-targeting somatostatin, neuropeptide Y and vasoactive intestinal peptide interneurons.
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Affiliation(s)
- Dipesh Joshi
- Schizophrenia Research Institute, Liverpool St, Darlinghurst, NSW 2011, Australia; Neuroscience Research Australia, Barker St, Randwick, NSW 2031, Australia; School of Psychiatry, Faculty of Medicine, University of New South Wales, Sydney, NSW 2052, Australia
| | - Janice M Fullerton
- Schizophrenia Research Institute, Liverpool St, Darlinghurst, NSW 2011, Australia; Neuroscience Research Australia, Barker St, Randwick, NSW 2031, Australia; School of Medical Sciences, Faculty of Medicine, University of New South Wales, Sydney, NSW 2052, Australia
| | - Cynthia Shannon Weickert
- Schizophrenia Research Institute, Liverpool St, Darlinghurst, NSW 2011, Australia; Neuroscience Research Australia, Barker St, Randwick, NSW 2031, Australia; School of Psychiatry, Faculty of Medicine, University of New South Wales, Sydney, NSW 2052, Australia.
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19
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Downregulation of Neuregulin 1-ErbB4 Signaling and Antidepressant Properties of Ketamine: ErbB4 Expressing Pyramidal Neurons May Play a Role. J Mol Neurosci 2014; 55:372-3. [DOI: 10.1007/s12031-014-0340-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2014] [Accepted: 05/21/2014] [Indexed: 11/27/2022]
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20
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Central neuregulin-1/ErbB signaling modulates cardiac function via sympathetic activity in pressure overload-induced heart failure. J Hypertens 2014; 32:817-25. [DOI: 10.1097/hjh.0000000000000072] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Penzes P, Buonanno A, Passafaro M, Sala C, Sweet RA. Developmental vulnerability of synapses and circuits associated with neuropsychiatric disorders. J Neurochem 2013; 126:165-82. [PMID: 23574039 PMCID: PMC3700683 DOI: 10.1111/jnc.12261] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2013] [Accepted: 04/08/2013] [Indexed: 12/20/2022]
Abstract
Psychiatric and neurodegenerative disorders, including intellectual disability, autism spectrum disorders (ASD), schizophrenia (SZ), and Alzheimer's disease, pose an immense burden to society. Symptoms of these disorders become manifest at different stages of life: early childhood, adolescence, and late adulthood, respectively. Progress has been made in recent years toward understanding the genetic substrates, cellular mechanisms, brain circuits, and endophenotypes of these disorders. Multiple lines of evidence implicate excitatory and inhibitory synaptic circuits in the cortex and hippocampus as key cellular substrates of pathogenesis in these disorders. Excitatory/inhibitory balance--modulated largely by dopamine--critically regulates cortical network function, neural network activity (i.e. gamma oscillations) and behaviors associated with psychiatric disorders. Understanding the molecular underpinnings of synaptic pathology and neuronal network activity may thus provide essential insight into the pathogenesis of these disorders and can reveal novel drug targets to treat them. Here, we discuss recent genetic, neuropathological, and molecular studies that implicate alterations in excitatory and inhibitory synaptic circuits in the pathogenesis of psychiatric disorders across the lifespan.
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Affiliation(s)
- Peter Penzes
- Department of Physiology, Northwestern University Feinberg School of Medicine, Chicago, Illinois 60611, USA.
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Deng C, Pan B, Engel M, Huang XF. Neuregulin-1 signalling and antipsychotic treatment: potential therapeutic targets in a schizophrenia candidate signalling pathway. Psychopharmacology (Berl) 2013; 226:201-15. [PMID: 23389757 DOI: 10.1007/s00213-013-3003-2] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2012] [Accepted: 01/22/2013] [Indexed: 02/08/2023]
Abstract
Identifying the signalling pathways underlying the pathophysiology of schizophrenia is an essential step in the rational development of new antipsychotic drugs for this devastating disease. Evidence from genetic, transgenic and post-mortem studies have strongly supported neuregulin-1 (NRG1)-ErbB4 signalling as a schizophrenia susceptibility pathway. NRG1-ErbB4 signalling plays crucial roles in regulating neurodevelopment and neurotransmission, with implications for the pathophysiology of schizophrenia. Post-mortem studies have demonstrated altered NRG1-ErbB4 signalling in the brain of schizophrenia patients. Antipsychotic drugs have different effects on NRG1-ErbB4 signalling depending on treatment duration. Abnormal behaviours relevant to certain features of schizophrenia are displayed in NRG1/ErbB4 knockout mice or those with NRG1/ErbB4 over-expression, some of these abnormalities can be improved by antipsychotic treatment. NRG1-ErbB4 signalling has extensive interactions with the GABAergic, glutamatergic and dopaminergic neurotransmission systems that are involved in the pathophysiology of schizophrenia. These interactions provide a number of targets for the development of new antipsychotic drugs. Furthermore, the key interaction points between NRG1-ErbB4 signalling and other schizophrenia susceptibility genes may also potentially provide specific targets for new antipsychotic drugs. In general, identification of these targets in NRG1-ErbB4 signalling and interacting pathways will provide unique opportunities for the development of new generation antipsychotics with specific efficacy and fewer side effects.
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Affiliation(s)
- Chao Deng
- Antipsychotic Research Laboratory, Illawarra Health and Medical Research Institute, University of Wollongong, Wollongong 2522 NSW, Australia.
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Abstract
Studies in genetically modified mice have demonstrated that neuregulin-1 (NRG-1), along with the erythroblastic leukemia viral oncogene homolog (ErbB) 2, 3, and 4 receptor tyrosine kinases, is necessary for multiple aspects of cardiovascular development. These observations stimulated in vitro and in vivo animal studies, implicating NRG-1/ErbB signaling in the regulation of cardiac cell biology throughout life. Cardiovascular effects of ErbB2-targeted cancer therapies provide evidence in humans that ErbB signaling plays a role in the maintenance of cardiac function. These and other studies suggest a conceptual model in which a key function of NRG-1/ErbB signaling is to mediate adaptations of the heart to physiological and pathological stimuli through activation of intracellular kinase cascades that regulate tissue plasticity. Recent work implicates NRG-1/ErbB signaling in the regulation of multiple aspects of cardiovascular biology, including angiogenesis, blood pressure, and skeletal muscle responses to exercise. The therapeutic potential of recombinant NRG-1 as a potential treatment for heart failure has been demonstrated in animal models and is now being explored in clinical studies. NRG-1 is found in human serum and plasma, and it correlates with some clinical parameters, suggesting that it may have value as an indicator of prognosis. In this review, we bring together this growing literature on NRG-1 and its significance in cardiovascular development and disease.
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Affiliation(s)
- Oghenerukevwe Odiete
- Division of Cardiovascular Medicine, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN 37232, USA
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Matsukawa R, Hirooka Y, Ito K, Sunagawa K. Inhibition of neuregulin-1/ErbB signaling in the rostral ventrolateral medulla leads to hypertension through reduced nitric oxide synthesis. Am J Hypertens 2013; 26:51-7. [PMID: 23382327 DOI: 10.1093/ajh/hps005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND We recently reported that activation of neuregulin-1 (NRG-1)/ErbB signaling in the rostral ventrolateral medulla (RVLM) of the brainstem elicits sympathoinhibition and depressor effects, and ErbB2-type ErbB receptors are involved in the neurogenic mechanisms of hypertension. Nitric oxide (NO) in the RVLM also elicits sympathoinhibition and depressor effects. NRG-1 enhances NO synthase (NOS) expression in several tissues. Here, we tested the hypothesis that ErbB2 inhibition in the RVLM contributes to increasing blood pressure via modulating the effects of NOS. METHODS We measured the effects of chronic intracisternal infusion of an ErbB2 antagonist and local ErbB2 inhibition in the RVLM using RNA interference (ErbB2 siRNA) on blood pressure (BP), heart rate (HR), norepinephrine excretion (uNE), and NOS expression in the RVLM. The central effects of the ErbB2 antagonist or NRG-1β were investigated with or without chronic and acute prior administration of a NOS inhibitor. RESULTS Intracisternal infusion of the ErbB2 antagonist and ErbB2 siRNA increased BP, HR, and uNE; and reduced neuronal and endothelial NOS expression in the RVLM. Further, prior systemic administration of a NOS inhibitor abolished the pressor response to intracisternal infusion of an ErbB2 antagonist in awake rats. Prior injection of a NOS inhibitor or γ-aminobutyric acid-A receptor antagonist into the RVLM attenuated the depressor response to NRG-1 in anesthetized rats. CONCLUSIONS These findings indicate that inhibition of ErbB2 expression in the RVLM leads to hypertension, at least in part, by reducing NO synthesis and inhibiting γ-aminobutyric acid activity. NRG-1/ErbB signaling in the RVLM might exist upstream of NO synthesis.
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Affiliation(s)
- Ryuichi Matsukawa
- Department of Cardiovascular Medicine, Kyushu University Graduate School of Medical Sciences, Fukuoka, Japan
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Zhao WJ. Expression and Localization of Neuregulin-1 (Nrg1) and ErbB2/ErbB4 Receptors in Main Endocrine Organs of the Rhesus Monkey. Int J Endocrinol Metab 2013; 11:162-6. [PMID: 24348587 PMCID: PMC3860111 DOI: 10.5812/ijem.9871] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Revised: 01/30/2013] [Accepted: 02/06/2013] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND Although Neuregulin-1 (Nrg1)and its receptors have been indicated at the mRNA level in partial human endocrine organs and its functional roles have been evaluated in vitro, their morphological distribution in higher animals are not fully studied. The present research focused on expression of Nrg1 and its main receptors ErbB2 and ErbB4 in main endocrine organs of the rhesus monkey. MATERIALS AND METHODS The morphological expression of Nrg1 and its receptors ErbB2 and ErbB4 as well as their potential co-localization were determined by double immunofluorescence in the pituitary, thyroid, parathyroid, pancreas and adrenal gland sample tissues. The expression level of Nrg1 on each sample was indexed by the fold of integrative fluorescence intensity (IFI) relative to that of one cortical tissue. RESULTS Differential expression of Nrg1 and their cognate receptors ErbB2 and ErbB4 were found selectively expressed in endocrine organs we tested, with higher expression levels detected in the adrenal gland (AG) and pancreas. Co-localization of Nrg1 with either ErbB2 or ErbB4 was detected in AG, thyroid and parathyroid gland, and Nrg1 was only co-localized with ErbB4 in the islet cells of the pancreas. In the pituitary, adjacent localization of Nrg1 positive cells with ErbB4 positive cells were observed. CONCLUSIONS This investigation morphologically profiles the differential expression of Nrg1 and its receptors ErbB2 and ErbB4 in the main endocrine organ structures, suggesting an autocrine or paracrine-directed Nrg1-ErbB signaling pathway in some of these structures.
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Affiliation(s)
- Wei-jiang Zhao
- Center for Neuroscience, Shantou University Medical College, Shantou, People's Republic of China
- Corresponding author: Wei-jiang Zhao, Center for Neuroscience, Shantou University Medical College, 22 Xin Ling Road, Shantou, Guandong Province 515041, People’s Republic of China. Tel: + 86-13794125386, Fax: + 86-75488900236, E-mail:
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Depboylu C, Höllerhage M, Schnurrbusch S, Brundin P, Oertel WH, Schrattenholz A, Höglinger GU. Neuregulin-1 receptor tyrosine kinase ErbB4 is upregulated in midbrain dopaminergic neurons in Parkinson disease. Neurosci Lett 2012; 531:209-14. [DOI: 10.1016/j.neulet.2012.10.050] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2012] [Revised: 10/24/2012] [Accepted: 10/25/2012] [Indexed: 02/03/2023]
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du Bois TM, Newell KA, Huang XF. Perinatal phencyclidine treatment alters neuregulin 1/erbB4 expression and activation in later life. Eur Neuropsychopharmacol 2012; 22:356-63. [PMID: 21962913 DOI: 10.1016/j.euroneuro.2011.09.002] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2011] [Revised: 08/16/2011] [Accepted: 09/01/2011] [Indexed: 02/06/2023]
Abstract
Schizophrenia is a complex and devastating mental disorder of unknown etiology. Hypofunction of N-methyl-D-aspartate (NMDA) receptors are implicated in the disorder, since phencyclidine (PCP) and other NMDA receptor antagonists mimic schizophrenia-like symptoms in humans and animals so well. Moreover, genetic linkage and post mortem studies strongly suggest a role for altered neuregulin 1 (Nrg1)/erbB4 signaling in schizophrenia pathology. This study investigated the relationship between the NMDA receptor and Nrg1 signaling pathways using the perinatal PCP animal model. Rats (n=5/group) were treated with PCP (10 mg/kg) or saline on postnatal days (PN) 7, 9 and 11 and were sacrificed on PN12, 5 weeks and 20 weeks for biochemical analyses. Western blotting was used to determine total and phosphorylated levels of proteins involved in NMDA receptor/Nrg1 signaling in the prefrontal cortex and hippocampus. In the cortex, PCP treatment altered Nrg1/erbB4 expression levels throughout development, including decreased Nrg1 and erbB4 at PN12 (-25-30%; p<0.05); increased erbB4 and p-erbB4 (+18-27%; p<0.01) at 5 weeks; and decreased erbB4 and p-erbB4 (-16-18%; p<0.05) along with increased Nrg1 (+33%; p<0.01) at 20 weeks. In the hippocampus, levels of Nrg1/erbB4 were largely unaffected apart from a significant decrease in p-erbB4 at 20 weeks (-13%; p<0.001); however NMDA receptor subunits and PSD-95 showed increases at PN12 and 5 weeks (+20-32%; p<0.05), and decreases at 20 weeks (-22-29%; p<0.05). This study shows that NMDA receptor antagonism early in development can have long term effects on Nrg1/erbB4 expression which could be important in understanding pathological processes which might be involved in schizophrenia.
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Affiliation(s)
- Teresa Marie du Bois
- Centre for Translational Neuroscience, School of Health Sciences, Illawarra Health and Medical Research Institute, University of Wollongong, Northfields Avenue, Wollongong, NSW 2522, Australia.
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Wang YN, Hung MC. Nuclear functions and subcellular trafficking mechanisms of the epidermal growth factor receptor family. Cell Biosci 2012; 2:13. [PMID: 22520625 PMCID: PMC3418567 DOI: 10.1186/2045-3701-2-13] [Citation(s) in RCA: 111] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Accepted: 04/20/2012] [Indexed: 12/22/2022] Open
Abstract
Accumulating evidence suggests that various diseases, including many types of cancer, result from alteration of subcellular protein localization and compartmentalization. Therefore, it is worthwhile to expand our knowledge in subcellular trafficking of proteins, such as epidermal growth factor receptor (EGFR) and ErbB-2 of the receptor tyrosine kinases, which are highly expressed and activated in human malignancies and frequently correlated with poor prognosis. The well-characterized trafficking of cell surface EGFR is routed, via endocytosis and endosomal sorting, to either the lysosomes for degradation or back to the plasma membrane for recycling. A novel nuclear mode of EGFR signaling pathway has been gradually deciphered in which EGFR is shuttled from the cell surface to the nucleus after endocytosis, and there, it acts as a transcriptional regulator, transmits signals, and is involved in multiple biological functions, including cell proliferation, tumor progression, DNA repair and replication, and chemo- and radio-resistance. Internalized EGFR can also be transported from the cell surface to several intracellular compartments, such as the Golgi apparatus, the endoplasmic reticulum, and the mitochondria, in addition to the nucleus. In this review, we will summarize the functions of nuclear EGFR family and the potential pathways by which EGFR is trafficked from the cell surface to a variety of cellular organelles. A better understanding of the molecular mechanism of EGFR trafficking will shed light on both the receptor biology and potential therapeutic targets of anti-EGFR therapies for clinical application.
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Affiliation(s)
- Ying-Nai Wang
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030, USA.
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Neuregulin-1/ErbB signaling in rostral ventrolateral medulla is involved in blood pressure regulation as an antihypertensive system. J Hypertens 2011; 29:1735-42. [PMID: 21738056 DOI: 10.1097/hjh.0b013e32834937d6] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
OBJECTIVES Neuregulin-1 (NRG-1), located in the central nervous system (CNS), plays an important role in synaptic function, neurite outgrowth, and survival of neurons and glia acting on the ErbB receptor family. However, the functional role of NRG-1/ErbB signaling in the CNS and blood pressure regulation is unknown, particularly in the rostral ventrolateral medulla (RVLM), a major vasomotor center. Thus, we investigated whether NRG-1/ErbB signaling in the RVLM is involved in blood pressure regulation. METHODS AND RESULTS Microinjection of NRG-1 into the RVLM decreased arterial blood pressure, heart rate (HR), and renal sympathetic nerve activity (RSNA) in Wistar rats. In contrast, microinjection of an ErbB2 or ErbB4 inhibitor into the RVLM increased arterial pressure, HR, and RSNA. ErbB2 expression levels in the brainstem were significantly lower in spontaneously hypertensive rats (SHRs) than in Wistar-Kyoto (WKY) rats. Depressor responses to NRG-1 and pressor responses to the ErbB2 inhibitor were significantly smaller in SHRs than in WKY rats (P < 0.05). Furthermore, the inhibition of ErbB2 expression in the RVLM by RNA interference significantly increased arterial pressure, HR, and urinary norepinephrine excretion in conscious WKY rats (P < 0.01). CONCLUSION Our findings indicate that the NRG-1/ErbB signaling in the RVLM has depressor and sympathoinhibitory effects. Reduced NRG/ErbB2 signaling in the RVLM may contribute to the neural mechanisms of hypertension.
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Neddens J, Buonanno A. Expression of the neuregulin receptor ErbB4 in the brain of the rhesus monkey (Macaca mulatta). PLoS One 2011; 6:e27337. [PMID: 22087295 PMCID: PMC3210802 DOI: 10.1371/journal.pone.0027337] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2011] [Accepted: 10/14/2011] [Indexed: 02/03/2023] Open
Abstract
We demonstrated recently that frontal cortical expression of the Neuregulin (NRG) receptor ErbB4 is restricted to interneurons in rodents, macaques, and humans. However, little is known about protein expression patterns in other areas of the brain. In situ hybridization studies have shown high ErbB4 mRNA levels in various subcortical areas, suggesting that ErbB4 is also expressed in cell types other than cortical interneurons. Here, using highly-specific monoclonal antibodies, we provide the first extensive report of ErbB4 protein expression throughout the cerebrum of primates. We show that ErbB4 immunoreactivity is high in association cortices, intermediate in sensory cortices, and relatively low in motor cortices. The overall immunoreactivity in the hippocampal formation is intermediate, but is high in a subset of interneurons. We detected the highest overall immunoreactivity in distinct locations of the ventral hypothalamus, medial habenula, intercalated nuclei of the amygdala and structures of the ventral forebrain, such as the islands of Calleja, olfactory tubercle and ventral pallidum, and medium expression in the reticular thalamic nucleus. While this pattern is generally consistent with ErbB4 mRNA expression data, further investigations are needed to identify the exact cellular and subcellular sources of mRNA and protein expression in these areas. In contrast to in situ hybridization in rodents, we detected only low levels of ErbB4-immunoreactivity in mesencephalic dopaminergic nuclei but a diffuse pattern of immunofluorescence that was medium in the dorsal striatum and high in the ventral forebrain, suggesting that most ErbB4 protein in dopaminergic neurons could be transported to axons. We conclude that the NRG-ErbB4 signaling pathway can potentially influence many functional systems throughout the brain of primates, and suggest that major sites of action are areas of the “corticolimbic” network. This interpretation is functionally consistent with the genetic association of NRG1 and ERBB4 with schizophrenia.
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Affiliation(s)
- Jörg Neddens
- Section on Molecular Neurobiology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, United States of America.
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Neddens J, Fish KN, Tricoire L, Vullhorst D, Shamir A, Chung W, Lewis DA, McBain CJ, Buonanno A. Conserved interneuron-specific ErbB4 expression in frontal cortex of rodents, monkeys, and humans: implications for schizophrenia. Biol Psychiatry 2011; 70:636-45. [PMID: 21664604 PMCID: PMC5040357 DOI: 10.1016/j.biopsych.2011.04.016] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2011] [Revised: 04/15/2011] [Accepted: 04/15/2011] [Indexed: 12/16/2022]
Abstract
BACKGROUND Neuregulin-1 and ErbB4 are genetically associated with schizophrenia, and detailed knowledge of the cellular and subcellular localization of ErbB4 is important for understanding how neuregulin-1 regulates neuronal network activity and behavior. Expression of ErbB4 is restricted to interneurons in the rodent hippocampus and cortex. However, controversy remains about the cellular expression pattern in primate brain and its subcellular distribution in postsynaptic somatodendritic locations versus presynaptic terminals. METHODS ErbB4 expression was analyzed in pyramidal cells and interneurons in the frontal cortex of five species: C57BL6 mice (n = 3), ErbB4⁻/⁻ mice (n = 2), Sprague-Dawley rats (n = 3), two macaque species (n = 3 + 2), and humans (normal control subjects, n = 2). We investigated 1) messenger RNA in mice, macaques, and humans; 2) protein expression in all species using highly specific monoclonal antibodies; and 3) specificity tests of several ErbB4 antibodies on brain samples (mouse, macaque, human). RESULTS ErbB4 RNA is restricted to interneurons in the frontal cortex of mice. ErbB4 protein is undetectable in pyramidal cells of rodents, macaques, and human frontal cortex, whereas most interneurons positive for parvalbumin, calretinin, or cholecystokinin, but only a minority of calbindin-positive cells, co-express ErbB4 in macaques. Importantly, no presynaptic ErbB4 expression was detected in any species. CONCLUSIONS The interneuron-selective somatodendritic expression of ErbB4 is consistent with a primary role of neuregulin-ErbB4 signaling in the postsynaptic modulation of gamma-aminobutyric acidergic function in rodents and primates. Our data validate the use of rodents to analyze effects of abnormal ErbB4 function as a means to model endophenotypes of psychiatric disorders.
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Cooper MA, Koleske AJ. ErbB4 localization to interneurons: clearer insights into schizophrenia pathology. Biol Psychiatry 2011; 70:602-3. [PMID: 21924131 PMCID: PMC3376398 DOI: 10.1016/j.biopsych.2011.08.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/09/2011] [Accepted: 08/10/2011] [Indexed: 12/31/2022]
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Woo RS, Lee JH, Yu HN, Song DY, Baik TK. Expression of ErbB4 in the neurons of Alzheimer's disease brain and APP/PS1 mice, a model of Alzheimer's disease. Anat Cell Biol 2011; 44:116-27. [PMID: 21829755 PMCID: PMC3145840 DOI: 10.5115/acb.2011.44.2.116] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2011] [Revised: 04/21/2011] [Accepted: 05/02/2011] [Indexed: 01/10/2023] Open
Abstract
Neuregulin-1 (NRG1) plays important roles in the development and plasticity of the brain, and has also been reported to exhibit potent neuroprotective properties. Although ErbB4, a key NRG1 receptor, is expressed in multiple regions in the adult animal brain, little is known about its role in Alzheimer's disease (AD). AD is characterized by progressive impairment of cognition and behavioral disturbance that strongly correlate with degeneration and death of neurons in the cerebral cortex and limbic brain areas, such as the hippocampus and the amygdala. Here, we show that the ErbB4 and phospho-ErbB4 immunoreactivities were higher intensity in the neurons of the CA1-2 transitional field of AD brains as compared to age-matched controls. Also, ErbB4 expression was increased in the neurons of the cortico medial nucleus amygdala, human basal forebrain and superior frontal gyrus of AD brains. In cerebral cortex and hippocampus of amyloid precursor protein/presenilin 1 double transgenic mice, ErbB4 immunoreactivity significantly increased in comparison to age-matched wild type control. These results suggest that up-regulating of ErbB4 immunoreactivity may involve in the progression of pathology of AD.
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Affiliation(s)
- Ran-Sook Woo
- Department of Anatomy and Neuroscience, College of Medicine, Eulji University, Daejeon, Korea
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Liu Z, Gao W, Wang Y, Zhang W, Liu H, Li Z. Neuregulin-1β regulates outgrowth of neurites and migration of neurofilament 200 neurons from dorsal root ganglial explants in vitro. Peptides 2011; 32:1244-8. [PMID: 21515322 DOI: 10.1016/j.peptides.2011.04.005] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2011] [Revised: 04/04/2011] [Accepted: 04/07/2011] [Indexed: 01/05/2023]
Abstract
Neuregulin-1β (NRG-1β) signaling has multiple functions in neurons. To assess NRG-1β on neurite outgrowth and neuronal migration in vitro, organotypic dorsal root ganglion (DRG) neuronal culture model was established. Neurite outgrowth and neuronal migration were evaluated using this culture model in the presence (5nmol/L, 10nmol/L, 20nmol/L) or absence of NRG-1β. Neurofilament 200 (NF-200)-immunoreactive (IR) neurons were determined as the migrating neurons. The number of nerve fiber bundles extended from DRG explant increased significantly in the presence of NRG-1β (5nmol/L, 23.0±2.2, P<0.05; 10nmol/L, 27.0±2.7, P<0.001; 20nmol/L, 30.8±3.7, P<0.001) as compared with that in the absence of NRG-1β (19.0±2.2). The number of neurons migrating from DRG explants increased significantly in the presence of NRG-1β (5nmol/L, 39.6±5.0, P<0.05; 10nmol/L, 54.6±6.7, P<0.001; 20nmol/L, 62.2±5.7, P<0.001) as compared with that in the absence of NRG-1β (31.6±4.0). Moreover, the increase of the number of nerve fiber bundles and the number of migrating NF-200-IR neurons was dose-dependent for NRG-1β addition. The data in this study imply that NRG-1β promotes neurite outgrowth and neuronal migration from DRG explants in vitro.
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Affiliation(s)
- Zhen Liu
- Department of Anatomy, Shandong University School of Medicine, 44 Wenhua Xi Road, Jinan, Shandong Province 250012, China
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Rico B, Marín O. Neuregulin signaling, cortical circuitry development and schizophrenia. Curr Opin Genet Dev 2011; 21:262-70. [DOI: 10.1016/j.gde.2010.12.010] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2010] [Accepted: 12/21/2010] [Indexed: 01/28/2023]
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A nuclear variant of ErbB3 receptor tyrosine kinase regulates ezrin distribution and Schwann cell myelination. J Neurosci 2011; 31:5106-19. [PMID: 21451047 DOI: 10.1523/jneurosci.5635-10.2011] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Reciprocal interactions between glia and neurons are essential for the proper organization and function of the nervous system. Recently, the interaction between ErbB receptors (ErbB2 and ErbB3) on the surface of Schwann cells and neuronal Neuregulin-1 (NRG1) has emerged as the pivotal signal that controls Schwann cell development, association with axons, and myelination. To understand the function of NRG1-ErbB2/3 signaling axis in adult Schwann cell biology, we are studying the specific role of ErbB3 receptor tyrosine kinase (RTK) since it is the receptor for NRG1 on the surface of Schwann cells. Here, we show that alternative transcription initiation results in the formation of a nuclear variant of ErbB3 (nuc-ErbB3) in rat primary Schwann cells. nuc-ErbB3 possesses a functional nuclear localization signal sequence and binds to chromatin. Using chromatin immunoprecipitation (ChIP)-chip arrays, we identified the promoters that associate with nuc-ErbB3 and clustered the active promoters in Schwann cell gene expression. nuc-ErbB3 regulates the transcriptional activity of ezrin and HMGB1 promoters, whereas inhibition of nuc-ErbB3 expression results in reduced myelination and altered distribution of ezrin in the nodes of Ranvier. Finally, we reveal that NRG1 regulates the translation of nuc-ErbB3 in rat Schwann cells. For the first time, to our knowledge, we show that alternative transcription initiation from a gene that encodes a RTK is capable to generate a protein variant of the receptor with a distinct role in molecular and cellular regulation. We propose a new concept for the molecular regulation of myelination through the expression and distinct role of nuc-ErbB3.
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Chalazonitis A, D'Autréaux F, Pham TD, Kessler JA, Gershon MD. Bone morphogenetic proteins regulate enteric gliogenesis by modulating ErbB3 signaling. Dev Biol 2010; 350:64-79. [PMID: 21094638 DOI: 10.1016/j.ydbio.2010.11.017] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2010] [Revised: 10/20/2010] [Accepted: 11/11/2010] [Indexed: 12/19/2022]
Abstract
The neural crest-derived cell population that colonizes the bowel (ENCDC) contains proliferating neural/glial progenitors. We tested the hypothesis that bone morphogenetic proteins (BMPs 2 and 4), which are known to promote enteric neuronal differentiation at the expense of proliferation, function similarly in gliogenesis. Enteric gliogenesis was analyzed in mice that overexpress the BMP antagonist, noggin, or BMP4 in the primordial ENS. Noggin-induced loss-of-function decreased, while BMP4-induced gain-of-function increased the glial density and glia/neuron ratio. When added to immunoisolated ENCDC, BMPs provoked nuclear translocation of phosphorylated SMAD proteins and enhanced both glial differentiation and expression of the neuregulin receptor ErbB3. ErbB3 transcripts were detected in E12 rat gut, before glial markers are expressed; moreover, expression of the ErbB3 ligand, glial growth factor 2 (GGF2) escalated rapidly after its first detection at E14. ErbB3-immunoreactive cells were located in the ENS of fetal and adult mice. GGF2 stimulated gliogenesis and proliferation and inhibited glial cell derived neurotrophic factor (GDNF)-promoted neurogenesis. Enhanced glial apoptosis occurred following GGF2 withdrawal; BMPs intensified this GGF2-dependence and reduced GGF2-stimulated proliferation. These observations support the hypotheses that BMPs are required for enteric gliogenesis and act by promoting responsiveness of ENCDC to ErbB3 ligands such as GGF2.
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Affiliation(s)
- Alcmène Chalazonitis
- Department of Pathology & Cell Biology, Columbia University, New York, NY 10032, USA.
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Buonanno A. The neuregulin signaling pathway and schizophrenia: from genes to synapses and neural circuits. Brain Res Bull 2010; 83:122-31. [PMID: 20688137 PMCID: PMC2958213 DOI: 10.1016/j.brainresbull.2010.07.012] [Citation(s) in RCA: 126] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2010] [Revised: 07/14/2010] [Accepted: 07/20/2010] [Indexed: 02/07/2023]
Abstract
Numerous genetic linkage and association studies implicate members of the Neuregulin-ErbB receptor (NRG-ErbB) signaling pathway as schizophrenia "at risk" genes. An emphasis of this review is to propose plausible neurobiological mechanisms, regulated by the Neuregulin-ErbB signaling network, that may be altered in schizophrenia and contribute to its etiology. To this end, the distinct neurotransmitter pathways, neuronal subtypes and neural network systems altered in schizophrenia are initially discussed. Next, the review focuses on the possible significance of genetic studies associating NRG1 and ErbB4 with schizophrenia, in light of the functional role of this signaling pathway in regulating glutamatergic, GABAergic and dopaminergic neurotransmission, as well as modulating synaptic plasticity and gamma oscillations. The importance of restricted ErbB4 receptor expression in GABAergic interneurons is emphasized, particularly their expression at glutamatergic synapses of parvalbumin-positive fast-spiking interneurons where modulation of inhibitory drive could account for the dramatic effects of NRG-ErbB signaling on gamma oscillations and pyramidal neuron output. A case is made for reasons that the NRG-ErbB signaling pathway constitutes a "biologically plausible" system for understanding the pathogenic mechanisms that may underlie the complex array of positive, negative and cognitive deficits associated with schizophrenia during development.
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Affiliation(s)
- Andrés Buonanno
- National Institutes of Health, Eunice Shriver Kennedy NICHD, Section on Molecular Neurobiology, Program of Developmental Neurobiology, 35 Lincoln Drive, Bethesda, MD 20892-3714, USA.
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Wang YN, Yamaguchi H, Hsu JM, Hung MC. Nuclear trafficking of the epidermal growth factor receptor family membrane proteins. Oncogene 2010; 29:3997-4006. [PMID: 20473332 DOI: 10.1038/onc.2010.157] [Citation(s) in RCA: 168] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Multiple membrane-bound receptor tyrosine kinases (RTKs), such as the epidermal growth factor receptor (EGFR) and ErbB-2, have been reported to be localized in the nucleus, where emerging evidence suggests that they are involved in transcriptional regulation, cell proliferation, DNA repair and chemo- and radio-resistance. Recent studies have shown that endocytosis and endosomal sorting are involved in the nuclear transport of cell surface RTKs. However, the detailed mechanism by which the full-length receptors embedded in the endosomal membrane travel all the way from the cell surface to the early endosomes and pass through the nuclear pore complexes is unknown. This important area has been overlooked for decades, which has hindered progress in our understanding of nuclear RTKs' functions. Here, we discuss the putative mechanisms by which EGFR family RTKs are shuttled into the nucleus. Understanding the trafficking mechanisms as to how RTKs are transported from the cell surface to the nucleus will significantly contribute to understanding the functions of the nuclear RTKs.
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Affiliation(s)
- Y-N Wang
- Department of Molecular and Cellular Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
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Wang SC, Hung MC. Nuclear translocation of the epidermal growth factor receptor family membrane tyrosine kinase receptors. Clin Cancer Res 2009; 15:6484-9. [PMID: 19861462 PMCID: PMC5537741 DOI: 10.1158/1078-0432.ccr-08-2813] [Citation(s) in RCA: 137] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Integral membrane proteins contain a hydrophobic transmembrane domain and mainly locate in the plasma membrane lipid bilayer. The receptor tyrosine kinases (RTK) of the epidermal growth factor receptor (EGFR) superfamily, including ErbB-1, ErbB-2, ErbB-3, and ErbB-4, constitute an important group of such membrane proteins, which have a profound impact on cancer initiation, progression, and patient outcome. Although studies of their functions have conventionally focused on their membrane-associated forms, documented observations of the presence of these membrane receptors and their functioning partners in the nucleus have reshaped the intracellular geography and highlight the need to modify the central dogma. The ErbB proteins in the membrane can translocate to the nucleus through different mechanisms. Nuclear RTKs regulate a variety of cellular functions, such as cell proliferation, DNA damage repair, and signal transduction, both in normal tissues and in human cancer cell. In addition, they play important roles in determining cancer response to cancer therapy. Nuclear presence of these ErbB proteins is emerging as an important marker in human cancers. An integrated picture of the RTK-centered signaling transduction network extending from the membrane-cytoplasm boundary to the nuclear compartment is looming in the foreseeable horizon for clinical application.
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Affiliation(s)
- Shao-Chun Wang
- Department of Molecular and Cellular Oncology, University of Texas M. D. Anderson Cancer Center, Houston, Texas
- Department of Cancer and Cell Biology, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Mien-Chie Hung
- Department of Molecular and Cellular Oncology, University of Texas M. D. Anderson Cancer Center, Houston, Texas
- Center for Molecular Medicine and Graduate Institute of Cancer Biology, China Medical University and Hospital, Taichung, Taiwan and Asia University, Taichung 413, Taiwan
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Selective expression of ErbB4 in interneurons, but not pyramidal cells, of the rodent hippocampus. J Neurosci 2009; 29:12255-64. [PMID: 19793984 DOI: 10.1523/jneurosci.2454-09.2009] [Citation(s) in RCA: 183] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
NRG1 and ERBB4 have emerged as some of the most reproducible schizophrenia risk genes. Moreover, the Neuregulin (NRG)/ErbB4 signaling pathway has been implicated in dendritic spine morphogenesis, glutamatergic synaptic plasticity, and neural network control. However, despite much attention this pathway and its effects on pyramidal cells have received recently, the presence of ErbB4 in these cells is still controversial. As knowledge of the precise locus of receptor expression is crucial to delineating the mechanisms by which NRG signaling elicits its diverse physiological effects, we have undertaken a thorough analysis of ErbB4 distribution in the CA1 area of the rodent hippocampus using newly generated rabbit monoclonal antibodies and ErbB4-mutant mice as negative controls. We detected ErbB4 immunoreactivity in GABAergic interneurons but not in pyramidal neurons, a finding that was further corroborated by the lack of ErbB4 mRNA in electrophysiologically identified pyramidal neurons as determined by single-cell reverse transcription-PCR. Contrary to some previous reports, we also did not detect processed ErbB4 fragments or nuclear ErbB4 immunoreactivity. Ultrastructural analysis in CA1 interneurons using immunoelectron microscopy revealed abundant ErbB4 expression in the somatodendritic compartment in which it accumulates at, and adjacent to, glutamatergic postsynaptic sites. In contrast, we found no evidence for presynaptic expression in cultured GAD67-positive hippocampal interneurons and in CA1 basket cell terminals. Our findings identify ErbB4-expressing interneurons, but not pyramidal neurons, as a primary target of NRG signaling in the hippocampus and, furthermore, implicate ErbB4 as a selective marker for glutamatergic synapses on inhibitory interneurons.
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Zheng Y, Watakabe A, Takada M, Kakita A, Namba H, Takahashi H, Yamamori T, Nawa H. Expression of ErbB4 in substantia nigra dopamine neurons of monkeys and humans. Prog Neuropsychopharmacol Biol Psychiatry 2009; 33:701-6. [PMID: 19336245 DOI: 10.1016/j.pnpbp.2009.03.021] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/09/2008] [Revised: 03/16/2009] [Accepted: 03/17/2009] [Indexed: 12/19/2022]
Abstract
Abnormal neuregulin-1 signaling through its receptor (ErbB4) might be associated with schizophrenia, although their neuropathological contribution remains controversial. To assess the role of neuregulin-1 in the dopamine hypothesis of schizophrenia, we used in situ hybridization and immunoblotting to investigate the cellular distribution of ErbB4 mRNA in the substantia nigra of Japanese monkeys (Macaca fuscata) and human postmortem brains. In both monkeys and humans, significant signal for ErbB4 mRNA was detected in substantia nigra dopamine neurons, which were identified by melanin deposits. The expression of ErbB4 mRNA in nigral dopamine neurons was confirmed with an independent RNA probe, as well as with combined tyrosine hydroxylase immunostaining. Immunoblotting appeared to support the observation of in situ hybridization. Immunoreactivity for ErbB4 protein was much more enriched in substantia nigra pars compacta containing dopamine neurons than in neighboring substantia nigra pars reticulata. These observations suggest that ErbB4 is expressed in the dopaminergic neurons of primate substantia nigra and ErbB4 abnormality might contribute to the dopaminergic pathology associated with schizophrenia or other brain diseases.
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Affiliation(s)
- Yingjun Zheng
- Department of Molecular Neurobiology, Brain Research Institute, University of Niigata, Niigata 951-8585, Japan
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Dickerson JW, Hemmerle AM, Numan S, Lundgren KH, Seroogy KB. Decreased expression of ErbB4 and tyrosine hydroxylase mRNA and protein in the ventral midbrain of aged rats. Neuroscience 2009; 163:482-9. [PMID: 19505538 DOI: 10.1016/j.neuroscience.2009.06.008] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2009] [Revised: 06/03/2009] [Accepted: 06/04/2009] [Indexed: 10/20/2022]
Abstract
Decreased availability or efficacy of neurotrophic factors may underlie an increased susceptibility of mesencephalic dopaminergic cells to age-related degeneration. Neuregulins (NRGs) are pleotrophic growth factors for many cell types, including mesencephalic dopamine cells in culture and in vivo. The functional NRG receptor ErbB4 is expressed by virtually all midbrain dopamine neurons. To determine if levels of the NRG receptor are maintained during aging in the dopaminergic ventral mesencephalon, expression of ErbB4 mRNA and protein was examined in young (3 months), middle-aged (18 months), and old (24-25 months) Brown Norway/Fischer 344 F1 rats. ErbB4 mRNA levels in the substantia nigra pars compacta (SNpc), but not the adjacent ventral tegmental area (VTA) or subtantia nigra pars lateralis (SNl), were significantly reduced in the middle-aged and old animals when compared to young rats. Protein expression of ErbB4 in the ventral midbrain was significantly decreased in the old rats when compared to the young rats. Expression of tyrosine hydroxylase (TH) mRNA levels was significantly reduced in the old rats when compared to young animals in the SNpc, but not in the VTA or SNI. TH protein levels in the ventral midbrain were also decreased in the old animals when compared to the young animals. These data demonstrate a progressive decline of ErbB4 expression, coinciding with a loss of the dopamine-synthesizing enzyme TH, in the ventral midbrain of aged rats, particularly in the SNpc. These findings may implicate a role for diminished NRG/ErbB4 trophic support in dopamine-related neurodegenerative disorders of aging such as Parkinson's disease.
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Affiliation(s)
- J W Dickerson
- Department of Neurology, College of Medicine, University of Cincinnati, Cincinnati, OH 45267, USA
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Konrad A, Vucurevic G, Musso F, Stoeter P, Dahmen N, Winterer G. ErbB4 genotype predicts left frontotemporal structural connectivity in human brain. Neuropsychopharmacology 2009; 34:641-50. [PMID: 18668031 DOI: 10.1038/npp.2008.112] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Diminished left frontotemporal connectivity is among the most frequently reported findings in schizophrenia and there is evidence that altered neuronal myelination may in part account for this deficit. Several investigations have suggested that variations of the genes that encode the Neuregulin 1 (NRG1)-ErbB4 receptor complex are associated with schizophrenia illness. As NRG1--ErbB4 has been implicated in neuronal myelination, we investigated with diffusion tensor imaging (DTI) whether fractional anisotropy (FA)--a putative measure of neuronal myelination--is predicted by a risk haplotype of the ErbB4 gene. The effects of the ErbB4 genotype were investigated in healthy subjects (N=59; mean age: 22.6+/-1.8 years). We also measured reaction time (RT) during a selective attention/working memory paradigm (visual oddball). In the schizophrenia risk genotype group, we found lower FA in the temporal lobe white matter (WM) including frontotemporal fiber tracts, predominantly in the left hemisphere. RT was increased in the risk genotype group and correlated with FA in the affected brain region. As FA is considered to index structural integrity of WM, to which neuronal fiber myelination is contributing, our results suggest that variations of the ErbB4 genotype may confer risk for schizophrenia illness via its impact on left frontotemporal connectivity in human brain. Reliability and validity of the result is suggested by our observation that (1) the FA-genotype association was not only obtained in the entire sample but also in both the split halves and (2) a statistical relationship was found among RT, genotype and FA.
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Affiliation(s)
- Andreas Konrad
- Department of Psychiatry and Psychotherapy, Johannes Gutenberg University, Mainz, Germany.
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Maarouf CL, Daugs ID, Spina S, Vidal R, Kokjohn TA, Patton RL, Kalback WM, Luehrs DC, Walker DG, Castaño EM, Beach TG, Ghetti B, Roher AE. Histopathological and molecular heterogeneity among individuals with dementia associated with Presenilin mutations. Mol Neurodegener 2008; 3:20. [PMID: 19021905 PMCID: PMC2600784 DOI: 10.1186/1750-1326-3-20] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2008] [Accepted: 11/20/2008] [Indexed: 01/19/2023] Open
Abstract
Background Mutations in the presenilin (PSEN) genes are associated with early-onset familial Alzheimer's disease (FAD). Biochemical characterizations and comparisons have revealed that many PSEN mutations alter γ-secretase activity to promote accumulation of toxic Aβ42 peptides. In this study, we compared the histopathologic and biochemical profiles of ten FAD cases expressing independent PSEN mutations and determined the degradation patterns of amyloid-β precursor protein (AβPP), Notch, N-cadherin and Erb-B4 by γ-secretase. In addition, the levels of Aβ40/42 peptides were quantified by ELISA. Results We observed a wide variation in type, number and distribution of amyloid deposits and neurofibrillary tangles. Four of the ten cases examined exhibited a substantial enrichment in the relative proportions of Aβ40 over Aβ42. The AβPP N-terminal and C-terminal fragments and Tau species, assessed by Western blots and scanning densitometry, also demonstrated a wide variation. The Notch-1 intracellular domain was negligible by Western blotting in seven PSEN cases. There was significant N-cadherin and Erb-B4 peptide heterogeneity among the different PSEN mutations. Conclusion These observations imply that missense mutations in PSEN genes can alter a range of key γ-secretase activities to produce an array of subtly different biochemical, neuropathological and clinical manifestations. Beyond the broad common features of dementia, plaques and tangles, the various PSEN mutations resulted in a wide heterogeneity and complexity and differed from sporadic AD.
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Affiliation(s)
- Chera L Maarouf
- The Longtine Center for Molecular Biology and Genetics, Sun Health Research Institute, Sun City, AZ 85351, USA.
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Shao L, Vawter MP. Shared gene expression alterations in schizophrenia and bipolar disorder. Biol Psychiatry 2008; 64:89-97. [PMID: 18191109 PMCID: PMC3098561 DOI: 10.1016/j.biopsych.2007.11.010] [Citation(s) in RCA: 138] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2007] [Revised: 11/06/2007] [Accepted: 11/08/2007] [Indexed: 12/15/2022]
Abstract
BACKGROUND Schizophrenia and bipolar disorder together affect approximately 2.5% of the world population, and their etiologies are thought to involve multiple genetic variants and environmental influences. The analysis of gene expression patterns in brain may provide a characteristic signature for each disorder. METHODS RNA samples from the dorsolateral prefrontal cortex (Brodmann area 46) consisting of individuals with schizophrenia (SZ), bipolar disorder (BPD), and control subjects were tested on the Codelink Human 20K Bioarray platform. Selected transcripts were validated by quantitative real-time polymerase chain reaction (PCR). The strong effects of age, gender, and pH in the analysis of differential gene expression were controlled by analysis of covariance (ANCOVA). Criteria for differential gene expression were 1) a gene was significantly dysregulated in both BPD and SZ compared with control subjects and 2) significant in ANCOVA analysis with samples that have a pH above the median of the sample. RESULTS A list of 78 candidate genes passed these two criteria in BPD and SZ and was overrepresented for functional categories of nervous system development, immune system development and response, and cell death. Five dysregulated genes were confirmed with quantitative Q-PCR in both BPD and SZ. Three genes were highly enriched in brain expression (AGXT2L1, SLC1A2, and TU3A). The distribution of AGXT2L1 expression in control subjects versus BPD and SZ was highly significant (Fisher's Exact Test, p < 10(-06)). CONCLUSIONS These results suggest a partially shared molecular profile for both disorders and offer a window into discovery of common pathophysiology that might lead to core treatments.
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Affiliation(s)
- Ling Shao
- Department of Psychiatry and Human Behavior, Functional Genomics Laboratory, School of Medicine, University of California, Irvine, California 92697-4260, USA.
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Chong VZ, Webster MJ, Rothmond DA, Weickert CS. Specific developmental reductions in subventricular zone ErbB1 and ErbB4 mRNA in the human brain. Int J Dev Neurosci 2008; 26:791-803. [PMID: 18662768 DOI: 10.1016/j.ijdevneu.2008.06.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2007] [Revised: 06/26/2008] [Accepted: 06/27/2008] [Indexed: 01/18/2023] Open
Abstract
The primate postnatal subventricular zone (SVZ) lies under the ventrolateral borders of the lateral ventricles as a discrete region of cells with gliogenic and neurogenic capacity regulated by ErbB receptors. However, the specific role of each ErbB subtype in SVZ cell development remains unclear, particularly in the human brain. The postnatal spatial and temporal expression profile of ErbB subtypes in the human brain may provide valuable insight into their distinct functions in the SVZ following birth. Hence, we examined the expression profile of ErbB1, ErbB2, ErbB3 and ErbB4 mRNA in the SVZ of human postmortem brains from neonates, infants, toddlers, school age subjects, adolescents, young adults and adults using in situ hybridization. SVZ transcript levels of ErbB1 and ErbB4 were highest in neonates and diminished with age. SVZ ErbB4 mRNA quantities significantly decreased by >85% to almost undetectable levels after the first year of life, while SVZ ErbB1 transcript levels displayed more gradual reductions, stabilizing to approximately 30-40% of neonate levels after the age of 5 years. In the neonate and infant SVZ, ErbB4 mRNA was localized to cell clusters resembling migratory neuroblast aggregates whereas ErbB1 mRNA was expressed in cells along but not within these clusters. ErbB2 mRNA appeared to be constantly expressed in the human SVZ at all postnatal ages as opposed to ErbB3 transcripts, which were not detected in the human SVZ at any age following birth. These findings suggest that ErbB1 and ErbB4 may play more salient roles than ErbB2 and ErbB3 in mediating early postnatal neurodevelopmental events. In addition, ErbB1- and ErbB4-immunoreactive cells and fibers were extensive throughout the human infant SVZ, but did not appear to overlap with PSA-NCAM-immunopositive clusters. The restriction of robust SVZ ErbB4 expression to neonate and infant age groups may indicate that SVZ-derived ErbB4-dependent postnatal neuronal development is most extensive within a narrow time frame early after birth.
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Affiliation(s)
- Victor Z Chong
- MiNDS Unit, CBDB, National Institute of Mental Health, National Institutes of Health, Bethesda, MD, USA
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Chong VZ, Thompson M, Beltaifa S, Webster MJ, Law AJ, Weickert CS. Elevated neuregulin-1 and ErbB4 protein in the prefrontal cortex of schizophrenic patients. Schizophr Res 2008; 100:270-80. [PMID: 18243664 PMCID: PMC2746974 DOI: 10.1016/j.schres.2007.12.474] [Citation(s) in RCA: 148] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/27/2007] [Revised: 12/24/2007] [Accepted: 12/27/2007] [Indexed: 02/06/2023]
Abstract
Neuregulin-1 (NRG1) and its receptor, ErbB4, have been implicated in schizophrenia at both gene and transcript levels. The present investigation compared NRG1 and ErbB4 protein levels in prefrontal cortical (PFC) cytoplasmic and nuclear fractions among normal, schizophrenic, bipolar and major depressed subjects from the Stanley Consortium. We used immunoblotting procedures to examine potential NRG1 and ErbB4 immunoreactive bands, but specifically quantified NRG1 immunoreactive signals at 42, 48 and 53 kDa and ErbB4 immunoreactive signals at 21, 55, 60 and 180 kDa. PFC cytoplasmic 53 kDa NRG1 protein levels were significantly increased (approximately 20%) in schizophrenic patients relative to each of the other subject groups. We also detected diagnostic effects on PFC cytoplasmic full-length (180 kDa) ErbB4 protein levels, and post hoc tests revealed that these quantities were significantly increased (approximately 30%) in schizophrenic patients relative to normal and to depressed subjects. In addition, we examined the levels of potential ErbB4 cleavage products at 21, 55 and 60 kDa relative to those of full-length ErbB4 in the PFC fractions. We detected trends for diagnostic effects on PFC cytoplasmic 21 kDa/180 kDa and 55 kDa/180 kDa ratios, and post hoc tests revealed that these ratios were significantly reduced in schizophrenic patients relative to normal individuals. Our investigation suggests that schizophrenia-associated NRG1 and ErbB4 mRNA elevations also occur at the protein level and may be specific to schizophrenia. We hypothesize that ErbB4 proteolytic processing may also be altered in schizophrenia, yielding altered ratios of functionally distinct forms of ErbB4.
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Affiliation(s)
- Victor Z. Chong
- MiNDS Unit, CBDB, National Institute of Mental Health, National Institutes of Health, 10 Center Drive, Bldg. 10, Bethesda, MD, 20892, USA
| | - Mia Thompson
- MiNDS Unit, CBDB, National Institute of Mental Health, National Institutes of Health, 10 Center Drive, Bldg. 10, Bethesda, MD, 20892, USA
| | - Senda Beltaifa
- MiNDS Unit, CBDB, National Institute of Mental Health, National Institutes of Health, 10 Center Drive, Bldg. 10, Bethesda, MD, 20892, USA
| | - Maree J. Webster
- Dept. of Psychiatry, Stanley Laboratory of Brain Research, Uniform Services University of Health Sciences, Bethesda, MD, 20892, USA
| | - Amanda J. Law
- Dept. of Psychiatry, University of Oxford, Warneford Hospital, Oxford, OX3 7JX, United Kingdom
| | - Cynthia Shannon Weickert
- MiNDS Unit, CBDB, National Institute of Mental Health, National Institutes of Health, 10 Center Drive, Bldg. 10, Bethesda, MD, 20892, USA
- Schizophrenia Research Institute, Dept. of Psychiatry, University of New South Wales, Prince of Wales Medical Research Institute, Corner of Barker and Easy Street, Randwick, NSW 2031, Australia
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Mechawar N, Lacoste B, Yu WF, Srivastava LK, Quirion R. Developmental profile of neuregulin receptor ErbB4 in postnatal rat cerebral cortex and hippocampus. Neuroscience 2007; 148:126-39. [PMID: 17630218 DOI: 10.1016/j.neuroscience.2007.04.066] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2006] [Revised: 04/09/2007] [Accepted: 04/12/2007] [Indexed: 01/29/2023]
Abstract
We investigated the cellular and subcellular distributions of neuregulin tyrosine kinase receptor ErbB4 in the postnatal rat frontal cortex and hippocampus by light-, confocal- and electron-microscopic immunocytochemistry. At birth, ErbB4-immunoreactivity (ErbB4-IR) was prominent in the apical cytoplasm and dendrites of cortical plate neurons and hippocampal pyramidal cells. Throughout postnatal development and in adulthood, ErbB4-IR in both regions remained confined to the somatodendritic compartment of neurons, which increased in number to reach the adult pattern by the end of the first postnatal month (P30). At all ages examined, double-labeling experiments revealed that ErbB4-IR always co-localized with the neuronal marker neuronal nuclei (NeuN) and never with glial markers Nestin or glial fibrillary acidic protein (GFAP). Immunoperoxidase labeling at the ultrastructural level confirmed the exclusive localization of ErbB4-IR in somatodendrites, and notably in dendritic spines. Immunogold labeling showed preponderant ErbB4-IR in the cytoplasm, where it was associated with microtubules. Furthermore, ErbB4-IR was abundant in the nucleus of adult cortical and hippocampal neurons, suggesting a role for ErbB4 nuclear signaling in the brain beyond embryonic development. Taken together, these results show that ErbB4 is expressed by neuronal somatodendrites in cerebral cortex and hippocampus from birth to adulthood, and support a role for neuregulins in dendritic growth and plasticity.
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Affiliation(s)
- N Mechawar
- Douglas Hospital Research Centre, McGill University, Department of Psychiatry, 6875 LaSalle Boulevard, Verdun, Montréal, Québec, Canada H4H 1R3.
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