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Auteur L. S. NGUYEN |
Documents disponibles écrits par cet auteur (2)
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Profiling olfactory stem cells from living patients identifies miRNAs relevant for autism pathophysiology / L. S. NGUYEN in Molecular Autism, 7 (2016)
[article]
Titre : Profiling olfactory stem cells from living patients identifies miRNAs relevant for autism pathophysiology Type de document : Texte imprimé et/ou numérique Auteurs : L. S. NGUYEN, Auteur ; M. LEPLEUX, Auteur ; M. MAKHLOUF, Auteur ; C. MARTIN, Auteur ; J. FREGEAC, Auteur ; K. SIQUIER-PERNET, Auteur ; A. PHILIPPE, Auteur ; F. FERON, Auteur ; B. GEPNER, Auteur ; C. ROUGEULLE, Auteur ; Y. HUMEAU, Auteur ; L. COLLEAUX, Auteur Article en page(s) : 1p. Langues : Anglais (eng) Mots-clés : 3' Untranslated Regions/genetics Adult Adult Stem Cells/metabolism Animals Astrocytes/metabolism Autism Spectrum Disorder/genetics/pathology/physiopathology Cells, Cultured Female Fibroblasts/metabolism Genetic Vectors/genetics Hippocampus/cytology/embryology Humans Lentivirus/genetics Male Mice MicroRNAs/genetics/physiology Neurons/metabolism/ultrastructure Olfactory Mucosa/pathology Organ Specificity Real-Time Polymerase Chain Reaction Transcriptome Young Adult Astrocyte Autism spectrum disorders MicroRNA Neuron Olfactory mucosa stem cells Index. décimale : PER Périodiques Résumé : BACKGROUND: Autism spectrum disorders (ASD) are a group of neurodevelopmental disorders caused by the interaction between genetic vulnerability and environmental factors. MicroRNAs (miRNAs) are key posttranscriptional regulators involved in multiple aspects of brain development and function. Previous studies have investigated miRNAs expression in ASD using non-neural cells like lymphoblastoid cell lines (LCL) or postmortem tissues. However, the relevance of LCLs is questionable in the context of a neurodevelopmental disorder, and the impact of the cause of death and/or post-death handling of tissue likely contributes to the variations observed between studies on brain samples. METHODS: miRNA profiling using TLDA high-throughput real-time qPCR was performed on miRNAs extracted from olfactory mucosal stem cells (OMSCs) biopsied from eight patients and six controls. This tissue is considered as a closer tissue to neural stem cells that could be sampled in living patients and was never investigated for such a purpose before. Real-time PCR was used to validate a set of differentially expressed miRNAs, and bioinformatics analysis determined common pathways and gene targets. Luciferase assays and real-time PCR analysis were used to evaluate the effect of miRNAs misregulation on the expression and translation of several autism-related transcripts. Viral vector-mediated expression was used to evaluate the impact of miRNAs deregulation on neuronal or glial cells functions. RESULTS: We identified a signature of four miRNAs (miR-146a, miR-221, miR-654-5p, and miR-656) commonly deregulated in ASD. This signature is conserved in primary skin fibroblasts and may allow discriminating between ASD and intellectual disability samples. Putative target genes of the differentially expressed miRNAs were enriched for pathways previously associated to ASD, and altered levels of neuronal transcripts targeted by miR-146a, miR-221, and miR-656 were observed in patients' cells. In the mouse brain, miR-146a, and miR-221 display strong neuronal expression in regions important for high cognitive functions, and we demonstrated that reproducing abnormal miR-146a expression in mouse primary cell cultures leads to impaired neuronal dendritic arborization and increased astrocyte glutamate uptake capacities. CONCLUSIONS: While independent replication experiments are needed to clarify whether these four miRNAS could serve as early biomarkers of ASD, these findings may have important diagnostic implications. They also provide mechanistic connection between miRNA dysregulation and ASD pathophysiology and may open up new opportunities for therapeutic. En ligne : http://dx.doi.org/10.1186/s13229-015-0064-6 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=328
in Molecular Autism > 7 (2016) . - 1p.[article] Profiling olfactory stem cells from living patients identifies miRNAs relevant for autism pathophysiology [Texte imprimé et/ou numérique] / L. S. NGUYEN, Auteur ; M. LEPLEUX, Auteur ; M. MAKHLOUF, Auteur ; C. MARTIN, Auteur ; J. FREGEAC, Auteur ; K. SIQUIER-PERNET, Auteur ; A. PHILIPPE, Auteur ; F. FERON, Auteur ; B. GEPNER, Auteur ; C. ROUGEULLE, Auteur ; Y. HUMEAU, Auteur ; L. COLLEAUX, Auteur . - 1p.
Langues : Anglais (eng)
in Molecular Autism > 7 (2016) . - 1p.
Mots-clés : 3' Untranslated Regions/genetics Adult Adult Stem Cells/metabolism Animals Astrocytes/metabolism Autism Spectrum Disorder/genetics/pathology/physiopathology Cells, Cultured Female Fibroblasts/metabolism Genetic Vectors/genetics Hippocampus/cytology/embryology Humans Lentivirus/genetics Male Mice MicroRNAs/genetics/physiology Neurons/metabolism/ultrastructure Olfactory Mucosa/pathology Organ Specificity Real-Time Polymerase Chain Reaction Transcriptome Young Adult Astrocyte Autism spectrum disorders MicroRNA Neuron Olfactory mucosa stem cells Index. décimale : PER Périodiques Résumé : BACKGROUND: Autism spectrum disorders (ASD) are a group of neurodevelopmental disorders caused by the interaction between genetic vulnerability and environmental factors. MicroRNAs (miRNAs) are key posttranscriptional regulators involved in multiple aspects of brain development and function. Previous studies have investigated miRNAs expression in ASD using non-neural cells like lymphoblastoid cell lines (LCL) or postmortem tissues. However, the relevance of LCLs is questionable in the context of a neurodevelopmental disorder, and the impact of the cause of death and/or post-death handling of tissue likely contributes to the variations observed between studies on brain samples. METHODS: miRNA profiling using TLDA high-throughput real-time qPCR was performed on miRNAs extracted from olfactory mucosal stem cells (OMSCs) biopsied from eight patients and six controls. This tissue is considered as a closer tissue to neural stem cells that could be sampled in living patients and was never investigated for such a purpose before. Real-time PCR was used to validate a set of differentially expressed miRNAs, and bioinformatics analysis determined common pathways and gene targets. Luciferase assays and real-time PCR analysis were used to evaluate the effect of miRNAs misregulation on the expression and translation of several autism-related transcripts. Viral vector-mediated expression was used to evaluate the impact of miRNAs deregulation on neuronal or glial cells functions. RESULTS: We identified a signature of four miRNAs (miR-146a, miR-221, miR-654-5p, and miR-656) commonly deregulated in ASD. This signature is conserved in primary skin fibroblasts and may allow discriminating between ASD and intellectual disability samples. Putative target genes of the differentially expressed miRNAs were enriched for pathways previously associated to ASD, and altered levels of neuronal transcripts targeted by miR-146a, miR-221, and miR-656 were observed in patients' cells. In the mouse brain, miR-146a, and miR-221 display strong neuronal expression in regions important for high cognitive functions, and we demonstrated that reproducing abnormal miR-146a expression in mouse primary cell cultures leads to impaired neuronal dendritic arborization and increased astrocyte glutamate uptake capacities. CONCLUSIONS: While independent replication experiments are needed to clarify whether these four miRNAS could serve as early biomarkers of ASD, these findings may have important diagnostic implications. They also provide mechanistic connection between miRNA dysregulation and ASD pathophysiology and may open up new opportunities for therapeutic. En ligne : http://dx.doi.org/10.1186/s13229-015-0064-6 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=328 Role of miR-146a in neural stem cell differentiation and neural lineage determination: relevance for neurodevelopmental disorders / L. S. NGUYEN in Molecular Autism, 9 (2018)
[article]
Titre : Role of miR-146a in neural stem cell differentiation and neural lineage determination: relevance for neurodevelopmental disorders Type de document : Texte imprimé et/ou numérique Auteurs : L. S. NGUYEN, Auteur ; J. FREGEAC, Auteur ; C. BOLE-FEYSOT, Auteur ; N. CAGNARD, Auteur ; A. IYER, Auteur ; J. ANINK, Auteur ; E. ARONICA, Auteur ; O. ALIBEU, Auteur ; P. NITSCHKE, Auteur ; L. COLLEAUX, Auteur Article en page(s) : 38p. Langues : Anglais (eng) Mots-clés : Autism Spectrum Disorder/genetics/metabolism Cell Line Cell Lineage Child Female Humans Male MicroRNAs/genetics/metabolism Neural Stem Cells/cytology/metabolism Neurogenesis Temporal Lobe/cytology/metabolism Up-Regulation Autism spectrum disorders Human neural stem cell Transcriptome microRNA Index. décimale : PER Périodiques Résumé : Background: MicroRNAs (miRNAs) are small, non-coding RNAs that regulate gene expression at the post-transcriptional level. miRNAs have emerged as important modulators of brain development and neuronal function and are implicated in several neurological diseases. Previous studies found miR-146a upregulation is the most common miRNA deregulation event in neurodevelopmental disorders such as autism spectrum disorder (ASD), epilepsy, and intellectual disability (ID). Yet, how miR-146a upregulation affects the developing fetal brain remains unclear. Methods: We analyzed the expression of miR-146a in the temporal lobe of ASD children using Taqman assay. To assess the role of miR-146a in early brain development, we generated and characterized stably induced H9 human neural stem cell (H9 hNSC) overexpressing miR-146a using various cell and molecular biology techniques. Results: We first showed that miR-146a upregulation occurs early during childhood in the ASD brain. In H9 hNSC, miR-146a overexpression enhances neurite outgrowth and branching and favors differentiation into neuronal like cells. Expression analyses revealed that 10% of the transcriptome was deregulated and organized into two modules critical for cell cycle control and neuronal differentiation. Twenty known or predicted targets of miR-146a were significantly deregulated in the modules, acting as potential drivers. The two modules also display distinct transcription profiles during human brain development, affecting regions relevant for ASD including the neocortex, amygdala, and hippocampus. Cell type analyses indicate markers for pyramidal, and interneurons are highly enriched in the deregulated gene list. Up to 40% of known markers of newly defined neuronal lineages were deregulated, suggesting that miR-146a could participate also in the acquisition of neuronal identities. Conclusion: Our results demonstrate the dynamic roles of miR-146a in early neuronal development and provide new insight into the molecular events that link miR-146a overexpression to impaired neurodevelopment. This, in turn, may yield new therapeutic targets and strategies. En ligne : https://dx.doi.org/10.1186/s13229-018-0219-3 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=371
in Molecular Autism > 9 (2018) . - 38p.[article] Role of miR-146a in neural stem cell differentiation and neural lineage determination: relevance for neurodevelopmental disorders [Texte imprimé et/ou numérique] / L. S. NGUYEN, Auteur ; J. FREGEAC, Auteur ; C. BOLE-FEYSOT, Auteur ; N. CAGNARD, Auteur ; A. IYER, Auteur ; J. ANINK, Auteur ; E. ARONICA, Auteur ; O. ALIBEU, Auteur ; P. NITSCHKE, Auteur ; L. COLLEAUX, Auteur . - 38p.
Langues : Anglais (eng)
in Molecular Autism > 9 (2018) . - 38p.
Mots-clés : Autism Spectrum Disorder/genetics/metabolism Cell Line Cell Lineage Child Female Humans Male MicroRNAs/genetics/metabolism Neural Stem Cells/cytology/metabolism Neurogenesis Temporal Lobe/cytology/metabolism Up-Regulation Autism spectrum disorders Human neural stem cell Transcriptome microRNA Index. décimale : PER Périodiques Résumé : Background: MicroRNAs (miRNAs) are small, non-coding RNAs that regulate gene expression at the post-transcriptional level. miRNAs have emerged as important modulators of brain development and neuronal function and are implicated in several neurological diseases. Previous studies found miR-146a upregulation is the most common miRNA deregulation event in neurodevelopmental disorders such as autism spectrum disorder (ASD), epilepsy, and intellectual disability (ID). Yet, how miR-146a upregulation affects the developing fetal brain remains unclear. Methods: We analyzed the expression of miR-146a in the temporal lobe of ASD children using Taqman assay. To assess the role of miR-146a in early brain development, we generated and characterized stably induced H9 human neural stem cell (H9 hNSC) overexpressing miR-146a using various cell and molecular biology techniques. Results: We first showed that miR-146a upregulation occurs early during childhood in the ASD brain. In H9 hNSC, miR-146a overexpression enhances neurite outgrowth and branching and favors differentiation into neuronal like cells. Expression analyses revealed that 10% of the transcriptome was deregulated and organized into two modules critical for cell cycle control and neuronal differentiation. Twenty known or predicted targets of miR-146a were significantly deregulated in the modules, acting as potential drivers. The two modules also display distinct transcription profiles during human brain development, affecting regions relevant for ASD including the neocortex, amygdala, and hippocampus. Cell type analyses indicate markers for pyramidal, and interneurons are highly enriched in the deregulated gene list. Up to 40% of known markers of newly defined neuronal lineages were deregulated, suggesting that miR-146a could participate also in the acquisition of neuronal identities. Conclusion: Our results demonstrate the dynamic roles of miR-146a in early neuronal development and provide new insight into the molecular events that link miR-146a overexpression to impaired neurodevelopment. This, in turn, may yield new therapeutic targets and strategies. En ligne : https://dx.doi.org/10.1186/s13229-018-0219-3 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=371