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ErbB3 drives mammary epithelial survival and differentiation during pregnancy and lactation.
Williams MM, Vaught DB, Joly MM, Hicks DJ, Sanchez V, Owens P, Rahman B, Elion DL, Balko JM, Cook RS
(2017) Breast Cancer Res 19: 105
MeSH Terms: Alleles, Animals, Breast, Cell Differentiation, Cell Proliferation, Cell Survival, Epithelial Cells, Female, Gene Knockout Techniques, Immunohistochemistry, Lactation, Mice, Mice, Transgenic, Phosphatidylinositol 3-Kinases, Pregnancy, Proto-Oncogene Proteins c-akt, RNA, Messenger, Receptor, ErbB-3, Receptor, ErbB-4, STAT5 Transcription Factor, Signal Transduction
Show Abstract · Added March 14, 2018
BACKGROUND - During pregnancy, as the mammary gland prepares for synthesis and delivery of milk to newborns, a luminal mammary epithelial cell (MEC) subpopulation proliferates rapidly in response to systemic hormonal cues that activate STAT5A. While the receptor tyrosine kinase ErbB4 is required for STAT5A activation in MECs during pregnancy, it is unclear how ErbB3, a heterodimeric partner of ErbB4 and activator of phosphatidyl inositol-3 kinase (PI3K) signaling, contributes to lactogenic expansion of the mammary gland.
METHODS - We assessed mRNA expression levels by expression microarray of mouse mammary glands harvested throughout pregnancy and lactation. To study the role of ErbB3 in mammary gland lactogenesis, we used transgenic mice expressing WAP-driven Cre recombinase to generate a mouse model in which conditional ErbB3 ablation occurred specifically in alveolar mammary epithelial cells (aMECs).
RESULTS - Profiling of RNA from mouse MECs isolated throughout pregnancy revealed robust Erbb3 induction during mid-to-late pregnancy, a time point when aMECs proliferate rapidly and undergo differentiation to support milk production. Litters nursed by ErbB3 dams weighed significantly less when compared to litters nursed by ErbB3 dams. Further analysis revealed substantially reduced epithelial content, decreased aMEC proliferation, and increased aMEC cell death during late pregnancy. Consistent with the potent ability of ErbB3 to activate cell survival through the PI3K/Akt pathway, we found impaired Akt phosphorylation in ErbB3 samples, as well as impaired expression of STAT5A, a master regulator of lactogenesis. Constitutively active Akt rescued cell survival in ErbB3-depleted aMECs, but failed to restore STAT5A expression or activity. Interestingly, defects in growth and survival of ErbB3 aMECs as well as Akt phosphorylation, STAT5A activity, and expression of milk-encoding genes observed in ErbB3 MECs progressively improved between late pregnancy and lactation day 5. We found a compensatory upregulation of ErbB4 activity in ErbB3 mammary glands. Enforced ErbB4 expression alleviated the consequences of ErbB3 ablation in aMECs, while combined ablation of both ErbB3 and ErbB4 exaggerated the phenotype.
CONCLUSIONS - These studies demonstrate that ErbB3, like ErbB4, enhances lactogenic expansion and differentiation of the mammary gland during pregnancy, through activation of Akt and STAT5A, two targets crucial for lactation.
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21 MeSH Terms
Inflammation-dependent cerebrospinal fluid hypersecretion by the choroid plexus epithelium in posthemorrhagic hydrocephalus.
Karimy JK, Zhang J, Kurland DB, Theriault BC, Duran D, Stokum JA, Furey CG, Zhou X, Mansuri MS, Montejo J, Vera A, DiLuna ML, Delpire E, Alper SL, Gunel M, Gerzanich V, Medzhitov R, Simard JM, Kahle KT
(2017) Nat Med 23: 997-1003
MeSH Terms: Acetazolamide, Animals, Antioxidants, Blotting, Western, Bumetanide, Cerebral Hemorrhage, Cerebral Ventricles, Cerebrospinal Fluid, Choroid Plexus, Diuretics, Gene Knockdown Techniques, Gene Knockout Techniques, Hydrocephalus, Immunoblotting, Immunohistochemistry, Immunoprecipitation, Inflammation, NF-kappa B, Proline, Protein-Serine-Threonine Kinases, Rats, Rats, Wistar, Salicylanilides, Solute Carrier Family 12, Member 2, Sulfonamides, Thiocarbamates, Toll-Like Receptor 4
Show Abstract · Added April 3, 2018
The choroid plexus epithelium (CPE) secretes higher volumes of fluid (cerebrospinal fluid, CSF) than any other epithelium and simultaneously functions as the blood-CSF barrier to gate immune cell entry into the central nervous system. Posthemorrhagic hydrocephalus (PHH), an expansion of the cerebral ventricles due to CSF accumulation following intraventricular hemorrhage (IVH), is a common disease usually treated by suboptimal CSF shunting techniques. PHH is classically attributed to primary impairments in CSF reabsorption, but little experimental evidence supports this concept. In contrast, the potential contribution of CSF secretion to PHH has received little attention. In a rat model of PHH, we demonstrate that IVH causes a Toll-like receptor 4 (TLR4)- and NF-κB-dependent inflammatory response in the CPE that is associated with a ∼3-fold increase in bumetanide-sensitive CSF secretion. IVH-induced hypersecretion of CSF is mediated by TLR4-dependent activation of the Ste20-type stress kinase SPAK, which binds, phosphorylates, and stimulates the NKCC1 co-transporter at the CPE apical membrane. Genetic depletion of TLR4 or SPAK normalizes hyperactive CSF secretion rates and reduces PHH symptoms, as does treatment with drugs that antagonize TLR4-NF-κB signaling or the SPAK-NKCC1 co-transporter complex. These data uncover a previously unrecognized contribution of CSF hypersecretion to the pathogenesis of PHH, demonstrate a new role for TLRs in regulation of the internal brain milieu, and identify a kinase-regulated mechanism of CSF secretion that could be targeted by repurposed US Food and Drug Administration (FDA)-approved drugs to treat hydrocephalus.
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Comparative analysis of chimeric ZFP-, TALE- and Cas9-piggyBac transposases for integration into a single locus in human cells.
Luo W, Galvan DL, Woodard LE, Dorset D, Levy S, Wilson MH
(2017) Nucleic Acids Res 45: 8411-8422
MeSH Terms: Bacterial Proteins, CRISPR-Associated Protein 9, CRISPR-Cas Systems, Cell Line, Tumor, DNA Transposable Elements, Endonucleases, Gene Knockout Techniques, Gene Targeting, Gene Transfer Techniques, Humans, Hypoxanthine Phosphoribosyltransferase, Mutagenesis, Insertional, Recombinant Fusion Proteins, Reproducibility of Results, Transcription Activator-Like Effector Nucleases, Transcription Activator-Like Effectors, Transposases, Zinc Fingers
Show Abstract · Added September 11, 2017
Integrating DNA delivery systems hold promise for many applications including treatment of diseases; however, targeted integration is needed for improved safety. The piggyBac (PB) transposon system is a highly active non-viral gene delivery system capable of integrating defined DNA segments into host chromosomes without requiring homologous recombination. We systematically compared four different engineered zinc finger proteins (ZFP), four transcription activator-like effector proteins (TALE), CRISPR associated protein 9 (SpCas9) and the catalytically inactive dSpCas9 protein fused to the amino-terminus of the transposase enzyme designed to target the hypoxanthine phosphoribosyltransferase (HPRT) gene located on human chromosome X. Chimeric transposases were evaluated for expression, transposition activity, chromatin immunoprecipitation at the target loci, and targeted knockout of the HPRT gene in human cells. One ZFP-PB and one TALE-PB chimera demonstrated notable HPRT gene targeting. In contrast, Cas9/dCas9-PB chimeras did not result in gene targeting. Instead, the HPRT locus appeared to be protected from transposon integration. Supplied separately, PB permitted highly efficient isolation of Cas9-mediated knockout of HPRT, with zero transposon integrations in HPRT by deep sequencing. In summary, these tools may allow isolation of 'targeted-only' cells, be utilized to protect a genomic locus from transposon integration, and enrich for Cas9-mutated cells.
Published by Oxford University Press on behalf of Nucleic Acids Research 2017.
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Interaction of phosphorylated Rab11-FIP2 with Eps15 regulates apical junction composition.
Lapierre LA, Manning EH, Mitchell KM, Caldwell CM, Goldenring JR
(2017) Mol Biol Cell 28: 1088-1100
MeSH Terms: Adaptor Proteins, Signal Transducing, Animals, Cadherins, Carrier Proteins, Cell Polarity, Dogs, Endosomes, Epithelial Cells, Gene Knockout Techniques, HEK293 Cells, Humans, Intercellular Junctions, Madin Darby Canine Kidney Cells, Membrane Proteins, Occludin, Phosphorylation, Protein Binding, Protein Transport, rab GTP-Binding Proteins
Show Abstract · Added April 18, 2017
MARK2 regulates the establishment of polarity in Madin-Darby canine kidney (MDCK) cells in part through phosphorylation of serine 227 of Rab11-FIP2. We identified Eps15 as an interacting partner of phospho-S227-Rab11-FIP2 (pS227-FIP2). During recovery from low calcium, Eps15 localized to the lateral membrane before pS227-FIP2 arrival. Later in recovery, Eps15 and pS227-FIP2 colocalized at the lateral membrane. In MDCK cells expressing the pseudophosphorylated FIP2 mutant FIP2(S227E), during recovery from low calcium, Eps15 was trapped and never localized to the lateral membrane. Mutation of any of the three NPF domains within GFP-FIP2(S227E) rescued Eps15 localization at the lateral membrane and reestablished single-lumen cyst formation in GFP-FIP2(S227E)-expressing cells in three-dimensional (3D) culture. Whereas expression of GFP-FIP2(S227E) induced the loss of E-cadherin and occludin, mutation of any of the NPF domains of GFP-FIP2(S227E) reestablished both proteins at the apical junctions. Knockdown of Eps15 altered the spatial and temporal localization of pS227-FIP2 and also elicited formation of multiple lumens in MDCK 3D cysts. Thus an interaction of Eps15 and pS227-FIP2 at the appropriate time and location in polarizing cells is necessary for proper establishment of epithelial polarity.
© 2017 Lapierre et al. This article is distributed by The American Society for Cell Biology under license from the author(s). Two months after publication it is available to the public under an Attribution–Noncommercial–Share Alike 3.0 Unported Creative Commons License (http://creativecommons.org/licenses/by-nc-sa/3.0).
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19 MeSH Terms
SKP2 loss destabilizes EZH2 by promoting TRAF6-mediated ubiquitination to suppress prostate cancer.
Lu W, Liu S, Li B, Xie Y, Izban MG, Ballard BR, Sathyanarayana SA, Adunyah SE, Matusik RJ, Chen Z
(2017) Oncogene 36: 1364-1373
MeSH Terms: Animals, Cell Line, Tumor, Disease Models, Animal, Enhancer of Zeste Homolog 2 Protein, Gene Knockout Techniques, Histones, Humans, Lysine, Male, Mice, PTEN Phosphohydrolase, Prostate, Prostatic Neoplasms, Protein Stability, S-Phase Kinase-Associated Proteins, TNF Receptor-Associated Factor 6, Tumor Suppressor Protein p53, Ubiquitination
Show Abstract · Added April 18, 2017
EZH2 is crucial for the progression of prostate cancer (PCa) and castration-resistant prostate cancer (CRPC) through upregulation and activation of progenitor genes, as well as androgen receptor (AR)-target genes. However, the mechanisms by which EZH2 is regulated in PCa and CRPC remain elusive. Here we report that EZH2 is post-transcriptionally regulated by SKP2 in vitro in cultured cells and in vivo in mouse models. We observed aberrant upregulation of Skp2, Ezh2 and histone H3 lysine 27 trimethylation (H3K27me3) in both Pten null mouse embryonic fibroblasts (MEFs) and Pten null mouse prostate tissues. Loss of Skp2 resulted in a striking decrease of Ezh2 levels in Pten/Trp53 double-null MEFs and in prostate tumors of Pten/Trp53 double-null mutant mice. SKP2 knockdown decreased EZH2 levels in human PCa cells through upregulation of TRAF6-mediated and lysine(K) 63-linked ubiquitination of EZH2 for degradation. Ectopic expression of TRAF6 promoted the K63-linked ubiquitination of EZH2 to decrease EZH2 and H3K27me3 levels in PCa cells. In contrast, TRAF6 knockdown resulted in a reduced EZH2 ubiquitination with an increase of EZH2 and H3K27me3 levels in PCa cells. Furthermore, the catalytically dead mutant TRAF6 C70A abolished the TRAF6-mediated polyubiquitination of recombinant human EZH2 in vitro. Most importantly, a concurrent elevation of Skp2 and Ezh2 was found in CRPC tumors of Pten/Trp53 mutant mice, and expression levels of SKP2 and EZH2 were positively correlated in human PCa specimens. Taken together, our findings revealed a novel mechanism on EZH2 ubiquitination and an important signaling network of SKP2-TRAF6-EZH2/H3K27me3, and targeting SKP2-EZH2 pathway may be a promising therapeutic strategy for CRPC treatment.
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CREBBP Inactivation Promotes the Development of HDAC3-Dependent Lymphomas.
Jiang Y, Ortega-Molina A, Geng H, Ying HY, Hatzi K, Parsa S, McNally D, Wang L, Doane AS, Agirre X, Teater M, Meydan C, Li Z, Poloway D, Wang S, Ennishi D, Scott DW, Stengel KR, Kranz JE, Holson E, Sharma S, Young JW, Chu CS, Roeder RG, Shaknovich R, Hiebert SW, Gascoyne RD, Tam W, Elemento O, Wendel HG, Melnick AM
(2017) Cancer Discov 7: 38-53
MeSH Terms: Acetylation, Animals, CREB-Binding Protein, Cell Line, Tumor, Enhancer Elements, Genetic, Gene Knockout Techniques, Germinal Center, Histone Deacetylases, Histones, Humans, Lymphoma, Large B-Cell, Diffuse, Mice, Mutation, Neoplasm Transplantation, Nuclear Receptor Co-Repressor 2, Proto-Oncogene Proteins c-bcl-6, Transcription, Genetic
Show Abstract · Added April 6, 2017
Somatic mutations in CREBBP occur frequently in B-cell lymphoma. Here, we show that loss of CREBBP facilitates the development of germinal center (GC)-derived lymphomas in mice. In both human and murine lymphomas, CREBBP loss-of-function resulted in focal depletion of enhancer H3K27 acetylation and aberrant transcriptional silencing of genes that regulate B-cell signaling and immune responses, including class II MHC. Mechanistically, CREBBP-regulated enhancers are counter-regulated by the BCL6 transcriptional repressor in a complex with SMRT and HDAC3, which we found to bind extensively to MHC class II loci. HDAC3 loss-of-function rescued repression of these enhancers and corresponding genes, including MHC class II, and more profoundly suppressed CREBBP-mutant lymphomas in vitro and in vivo Hence, CREBBP loss-of-function contributes to lymphomagenesis by enabling unopposed suppression of enhancers by BCL6/SMRT/HDAC3 complexes, suggesting HDAC3-targeted therapy as a precision approach for CREBBP-mutant lymphomas.
SIGNIFICANCE - Our findings establish the tumor suppressor function of CREBBP in GC lymphomas in which CREBBP mutations disable acetylation and result in unopposed deacetylation by BCL6/SMRT/HDAC3 complexes at enhancers of B-cell signaling and immune response genes. Hence, inhibition of HDAC3 can restore the enhancer histone acetylation and may serve as a targeted therapy for CREBBP-mutant lymphomas. Cancer Discov; 7(1); 38-53. ©2016 AACR.See related commentary by Höpken, p. 14This article is highlighted in the In This Issue feature, p. 1.
©2016 American Association for Cancer Research.
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17 MeSH Terms
Transcriptional Maintenance of Pancreatic Acinar Identity, Differentiation, and Homeostasis by PTF1A.
Hoang CQ, Hale MA, Azevedo-Pouly AC, Elsässer HP, Deering TG, Willet SG, Pan FC, Magnuson MA, Wright CV, Swift GH, MacDonald RJ
(2016) Mol Cell Biol 36: 3033-3047
MeSH Terms: Acinar Cells, Animals, Cell Differentiation, Gene Expression Profiling, Gene Expression Regulation, Gene Knockout Techniques, Homeostasis, Mice, Pancreas, Exocrine, Protein Unfolding, Sequence Analysis, RNA, Transcription Factors, Transcription, Genetic, Unfolded Protein Response
Show Abstract · Added November 1, 2016
Maintenance of cell type identity is crucial for health, yet little is known of the regulation that sustains the long-term stability of differentiated phenotypes. To investigate the roles that key transcriptional regulators play in adult differentiated cells, we examined the effects of depletion of the developmental master regulator PTF1A on the specialized phenotype of the adult pancreatic acinar cell in vivo Transcriptome sequencing and chromatin immunoprecipitation sequencing results showed that PTF1A maintains the expression of genes for all cellular processes dedicated to the production of the secretory digestive enzymes, a highly attuned surveillance of unfolded proteins, and a heightened unfolded protein response (UPR). Control by PTF1A is direct on target genes and indirect through a ten-member transcription factor network. Depletion of PTF1A causes an imbalance that overwhelms the UPR, induces cellular injury, and provokes acinar metaplasia. Compromised cellular identity occurs by derepression of characteristic stomach genes, some of which are also associated with pancreatic ductal cells. The loss of acinar cell homeostasis, differentiation, and identity is directly relevant to the pathologies of pancreatitis and pancreatic adenocarcinoma.
Copyright © 2016, American Society for Microbiology. All Rights Reserved.
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14 MeSH Terms
Knockdown of triglyceride synthesis does not enhance palmitate lipotoxicity or prevent oleate-mediated rescue in rat hepatocytes.
Leamy AK, Hasenour CM, Egnatchik RA, Trenary IA, Yao CH, Patti GJ, Shiota M, Young JD
(2016) Biochim Biophys Acta 1861: 1005-1014
MeSH Terms: Animals, Apoptosis, Diacylglycerol O-Acyltransferase, Esterification, Gene Knockout Techniques, Hepatocytes, Lipid Metabolism, Lipogenesis, Oleic Acid, Oxidative Stress, Palmitic Acid, Rats, Triglycerides
Show Abstract · Added April 27, 2017
Experiments in a variety of cell types, including hepatocytes, consistently demonstrate the acutely lipotoxic effects of saturated fatty acids, such as palmitate (PA), but not unsaturated fatty acids, such as oleate (OA). PA+OA co-treatment fully prevents PA lipotoxicity through mechanisms that are not well defined but which have been previously attributed to more efficient esterification and sequestration of PA into triglycerides (TGs) when OA is abundant. However, this hypothesis has never been directly tested by experimentally modulating the relative partitioning of PA/OA between TGs and other lipid fates in hepatocytes. In this study, we found that addition of OA to PA-treated hepatocytes enhanced TG synthesis, reduced total PA uptake and PA lipid incorporation, decreased phospholipid saturation and rescued PA-induced ER stress and lipoapoptosis. Knockdown of diacylglycerol acyltransferase (DGAT), the rate-limiting step in TG synthesis, significantly reduced TG accumulation without impairing OA-mediated rescue of PA lipotoxicity. In both wild-type and DGAT-knockdown hepatocytes, OA co-treatment significantly reduced PA lipid incorporation and overall phospholipid saturation compared to PA-treated hepatocytes. These data indicate that OA's protective effects do not require increased conversion of PA into inert TGs, but instead may be due to OA's ability to compete against PA for cellular uptake and/or esterification and, thereby, normalize the composition of cellular lipids in the presence of a toxic PA load.
Copyright © 2016 Elsevier B.V. All rights reserved.
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13 MeSH Terms
Testing the role of predicted gene knockouts in human anthropometric trait variation.
Lessard S, Manning AK, Low-Kam C, Auer PL, Giri A, Graff M, Schurmann C, Yaghootkar H, Luan J, Esko T, Karaderi T, NHLBI GO Exome Sequence Project, GOT2D, T2D-GENES, GIANT Consortium, Bottinger EP, Lu Y, Carlson C, Caulfield M, Dubé MP, Jackson RD, Kooperberg C, McKnight B, Mongrain I, Peters U, Reiner AP, Rhainds D, Sotoodehnia N, Hirschhorn JN, Scott RA, Munroe PB, Frayling TM, Loos RJ, North KE, Edwards TL, Tardif JC, Lindgren CM, Lettre G
(2016) Hum Mol Genet 25: 2082-2092
MeSH Terms: Anthropometry, Body Height, Body Mass Index, Canada, Exome, Female, Gene Knockout Techniques, Genotype, Humans, Male, Mutation, Phenotype, Polymorphism, Single Nucleotide, Quantitative Trait Loci, Waist-Hip Ratio
Show Abstract · Added April 26, 2017
Although the role of complete gene inactivation by two loss-of-function mutations inherited in trans is well-established in recessive Mendelian diseases, we have not yet explored how such gene knockouts (KOs) could influence complex human phenotypes. Here, we developed a statistical framework to test the association between gene KOs and quantitative human traits. Our method is flexible, publicly available, and compatible with common genotype format files (e.g. PLINK and vcf). We characterized gene KOs in 4498 participants from the NHLBI Exome Sequence Project (ESP) sequenced at high coverage (>100×), 1976 French Canadians from the Montreal Heart Institute Biobank sequenced at low coverage (5.7×), and >100 000 participants from the Genetic Investigation of ANthropometric Traits (GIANT) Consortium genotyped on an exome array. We tested associations between gene KOs and three anthropometric traits: body mass index (BMI), height and BMI-adjusted waist-to-hip ratio (WHR). Despite our large sample size and multiple datasets available, we could not detect robust associations between specific gene KOs and quantitative anthropometric traits. Our results highlight several limitations and challenges for future gene KO studies in humans, in particular when there is no prior knowledge on the phenotypes that might be affected by the tested gene KOs. They also suggest that gene KOs identified with current DNA sequencing methodologies probably do not strongly influence normal variation in BMI, height, and WHR in the general human population.
© The Author 2016. Published by Oxford University Press.
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Neuron class-specific requirements for Fragile X Mental Retardation Protein in critical period development of calcium signaling in learning and memory circuitry.
Doll CA, Broadie K
(2016) Neurobiol Dis 89: 76-87
MeSH Terms: Animals, Animals, Genetically Modified, Calcium Signaling, Cholinergic Neurons, Critical Period (Psychology), Disease Models, Animal, Drosophila Proteins, Drosophila melanogaster, Fragile X Mental Retardation Protein, GABAergic Neurons, Gene Knockout Techniques, Learning, Memory, Mushroom Bodies, Neurons
Show Abstract · Added March 29, 2017
Neural circuit optimization occurs through sensory activity-dependent mechanisms that refine synaptic connectivity and information processing during early-use developmental critical periods. Fragile X Mental Retardation Protein (FMRP), the gene product lost in Fragile X syndrome (FXS), acts as an activity sensor during critical period development, both as an RNA-binding translation regulator and channel-binding excitability regulator. Here, we employ a Drosophila FXS disease model to assay calcium signaling dynamics with a targeted transgenic GCaMP reporter during critical period development of the mushroom body (MB) learning/memory circuit. We find FMRP regulates depolarization-induced calcium signaling in a neuron-specific manner within this circuit, suppressing activity-dependent calcium transients in excitatory cholinergic MB input projection neurons and enhancing calcium signals in inhibitory GABAergic MB output neurons. Both changes are restricted to the developmental critical period and rectified at maturity. Importantly, conditional genetic (dfmr1) rescue of null mutants during the critical period corrects calcium signaling defects in both neuron classes, indicating a temporally restricted FMRP requirement. Likewise, conditional dfmr1 knockdown (RNAi) during the critical period replicates constitutive null mutant defects in both neuron classes, confirming cell-autonomous requirements for FMRP in developmental regulation of calcium signaling dynamics. Optogenetic stimulation during the critical period enhances depolarization-induced calcium signaling in both neuron classes, but this developmental change is eliminated in dfmr1 null mutants, indicating the activity-dependent regulation requires FMRP. These results show FMRP shapes neuron class-specific calcium signaling in excitatory vs. inhibitory neurons in developing learning/memory circuitry, and that FMRP mediates activity-dependent regulation of calcium signaling specifically during the early-use critical period.
Copyright © 2016 Elsevier Inc. All rights reserved.
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