Project acronym DeFiNER
Project Nucleotide Excision Repair: Decoding its Functional Role in Mammals
Researcher (PI) Georgios Garinis
Host Institution (HI) IDRYMA TECHNOLOGIAS KAI EREVNAS
Call Details Consolidator Grant (CoG), LS4, ERC-2014-CoG
Summary Genome maintenance, chromatin remodelling and transcription are tightly linked biological processes that are currently poorly understood and vastly unexplored. Nucleotide excision repair (NER) is a major DNA repair pathway that mammalian cells employ to maintain their genome intact and faithfully transmit it into their progeny. Besides cancer and aging, however, defects in NER give rise to developmental disorders whose clinical heterogeneity and varying severity can only insufficiently be explained by the DNA repair defect. Recent work reveals that NER factors play a role, in addition to DNA repair, in transcription and the three-dimensional organization of our genome. Indeed, NER factors are now known to function in the regulation of gene expression, the transcriptional reprogramming of pluripotent stem cells and the fine-tuning of growth hormones during mammalian development. In this regard, the non-random organization of our genome, chromatin and the process of transcription itself are expected to play paramount roles in how NER factors coordinate, prioritize and execute their distinct tasks during development and disease progression. At present, however, no solid evidence exists as to how NER is functionally involved in such complex processes, what are the NER-associated protein complexes and underlying gene networks or how NER factors operate within the complex chromatin architecture. This is primarily due to our difficulties in dissecting the diverse functional contributions of NER proteins in an intact organism. Here, we propose to use a unique series of knock-in, transgenic and NER progeroid mice to decode the functional role of NER in mammals, thus paving the way for understanding how genome maintenance pathways are connected to developmental defects and disease mechanisms in vivo.
Summary
Genome maintenance, chromatin remodelling and transcription are tightly linked biological processes that are currently poorly understood and vastly unexplored. Nucleotide excision repair (NER) is a major DNA repair pathway that mammalian cells employ to maintain their genome intact and faithfully transmit it into their progeny. Besides cancer and aging, however, defects in NER give rise to developmental disorders whose clinical heterogeneity and varying severity can only insufficiently be explained by the DNA repair defect. Recent work reveals that NER factors play a role, in addition to DNA repair, in transcription and the three-dimensional organization of our genome. Indeed, NER factors are now known to function in the regulation of gene expression, the transcriptional reprogramming of pluripotent stem cells and the fine-tuning of growth hormones during mammalian development. In this regard, the non-random organization of our genome, chromatin and the process of transcription itself are expected to play paramount roles in how NER factors coordinate, prioritize and execute their distinct tasks during development and disease progression. At present, however, no solid evidence exists as to how NER is functionally involved in such complex processes, what are the NER-associated protein complexes and underlying gene networks or how NER factors operate within the complex chromatin architecture. This is primarily due to our difficulties in dissecting the diverse functional contributions of NER proteins in an intact organism. Here, we propose to use a unique series of knock-in, transgenic and NER progeroid mice to decode the functional role of NER in mammals, thus paving the way for understanding how genome maintenance pathways are connected to developmental defects and disease mechanisms in vivo.
Max ERC Funding
1 995 000 €
Duration
Start date: 2016-01-01, End date: 2020-12-31
Project acronym dEMORY
Project Dissecting the Role of Dendrites in Memory
Researcher (PI) Panayiota Poirazi
Host Institution (HI) FOUNDATION FOR RESEARCH AND TECHNOLOGY HELLAS
Call Details Starting Grant (StG), LS5, ERC-2012-StG_20111109
Summary Understanding the rules and mechanisms underlying memory formation, storage and retrieval is a grand challenge in neuroscience. In light of cumulating evidence regarding non-linear dendritic events (dendritic-spikes, branch strength potentiation, temporal sequence detection etc) together with activity-dependent rewiring of the connection matrix, the classical notion of information storage via Hebbian-like changes in synaptic connections is inadequate. While more recent plasticity theories consider non-linear dendritic properties, a unifying theory of how dendrites are utilized to achieve memory coding, storing and/or retrieval is cruelly missing. Using computational models, we will simulate memory processes in three key brain regions: the hippocampus, the amygdala and the prefrontal cortex. Models will incorporate biologically constrained dendrites and state-of-the-art plasticity rules and will span different levels of abstraction, ranging from detailed biophysical single neurons and circuits to integrate-and-fire networks and abstract theoretical models. Our main goal is to dissect the role of dendrites in information processing and storage across the three different regions by systematically altering their anatomical, biophysical and plasticity properties. Findings will further our understanding of the fundamental computations supported by these structures and how these computations, reinforced by plasticity mechanisms, sub-serve memory formation and associated dysfunctions, thus opening new avenues for hypothesis driven experimentation and development of novel treatments for memory-related diseases. Identification of dendrites as the key processing units across brain regions and complexity levels will lay the foundations for a new era in computational and experimental neuroscience and serve as the basis for groundbreaking advances in the robotics and artificial intelligence fields while also having a large impact on the machine learning community.
Summary
Understanding the rules and mechanisms underlying memory formation, storage and retrieval is a grand challenge in neuroscience. In light of cumulating evidence regarding non-linear dendritic events (dendritic-spikes, branch strength potentiation, temporal sequence detection etc) together with activity-dependent rewiring of the connection matrix, the classical notion of information storage via Hebbian-like changes in synaptic connections is inadequate. While more recent plasticity theories consider non-linear dendritic properties, a unifying theory of how dendrites are utilized to achieve memory coding, storing and/or retrieval is cruelly missing. Using computational models, we will simulate memory processes in three key brain regions: the hippocampus, the amygdala and the prefrontal cortex. Models will incorporate biologically constrained dendrites and state-of-the-art plasticity rules and will span different levels of abstraction, ranging from detailed biophysical single neurons and circuits to integrate-and-fire networks and abstract theoretical models. Our main goal is to dissect the role of dendrites in information processing and storage across the three different regions by systematically altering their anatomical, biophysical and plasticity properties. Findings will further our understanding of the fundamental computations supported by these structures and how these computations, reinforced by plasticity mechanisms, sub-serve memory formation and associated dysfunctions, thus opening new avenues for hypothesis driven experimentation and development of novel treatments for memory-related diseases. Identification of dendrites as the key processing units across brain regions and complexity levels will lay the foundations for a new era in computational and experimental neuroscience and serve as the basis for groundbreaking advances in the robotics and artificial intelligence fields while also having a large impact on the machine learning community.
Max ERC Funding
1 398 000 €
Duration
Start date: 2012-10-01, End date: 2017-09-30
Project acronym DYNACOM
Project From Genome Integrity to Genome Plasticity:
Dynamic Complexes Controlling Once per Cell Cycle Replication
Researcher (PI) Zoi Lygerou
Host Institution (HI) PANEPISTIMIO PATRON
Call Details Starting Grant (StG), LS3, ERC-2011-StG_20101109
Summary Accurate genome duplication is controlled by multi-subunit protein complexes which associate with chromatin and dictate when and where replication should take place. Dynamic changes in these complexes lie at the heart of their ability to ensure the maintenance of genomic integrity. Defects in origin bound complexes lead to re-replication of the genome across evolution, have been linked to DNA-replication stress and may predispose for gene amplification events. Such genomic aberrations are central to malignant transformation.
We wish to understand how once per cell cycle replication is normally controlled within the context of the living cell and how defects in this control may result in loss of genome integrity and provide genome plasticity. To this end, live cell imaging in human cells in culture will be combined with genetic studies in fission yeast and modelling and in silico analysis.
The proposed research aims to:
1. Decipher the regulatory mechanisms which act in time and space to ensure once per cell cycle replication within living cells and how they may be affected by system aberrations, using functional live cell imaging.
2. Test whether aberrations in the licensing system may provide a selective advantage, through amplification of multiple genomic loci. To this end, a natural selection experiment will be set up in fission yeast .
3. Investigate how rereplication takes place along the genome in single cells. Is there heterogeneity amongst a population, leading to a plethora of different genotypes? In silico analysis of full genome DNA rereplication will be combined to single cell analysis in fission yeast.
4. Assess the relevance of our findings for gene amplification events in cancer. Does ectopic expression of human Cdt1/Cdc6 in cancer cells enhance drug resistance through gene amplification?
Our findings are expected to offer novel insight into mechanisms underlying cancer development and progression.
Summary
Accurate genome duplication is controlled by multi-subunit protein complexes which associate with chromatin and dictate when and where replication should take place. Dynamic changes in these complexes lie at the heart of their ability to ensure the maintenance of genomic integrity. Defects in origin bound complexes lead to re-replication of the genome across evolution, have been linked to DNA-replication stress and may predispose for gene amplification events. Such genomic aberrations are central to malignant transformation.
We wish to understand how once per cell cycle replication is normally controlled within the context of the living cell and how defects in this control may result in loss of genome integrity and provide genome plasticity. To this end, live cell imaging in human cells in culture will be combined with genetic studies in fission yeast and modelling and in silico analysis.
The proposed research aims to:
1. Decipher the regulatory mechanisms which act in time and space to ensure once per cell cycle replication within living cells and how they may be affected by system aberrations, using functional live cell imaging.
2. Test whether aberrations in the licensing system may provide a selective advantage, through amplification of multiple genomic loci. To this end, a natural selection experiment will be set up in fission yeast .
3. Investigate how rereplication takes place along the genome in single cells. Is there heterogeneity amongst a population, leading to a plethora of different genotypes? In silico analysis of full genome DNA rereplication will be combined to single cell analysis in fission yeast.
4. Assess the relevance of our findings for gene amplification events in cancer. Does ectopic expression of human Cdt1/Cdc6 in cancer cells enhance drug resistance through gene amplification?
Our findings are expected to offer novel insight into mechanisms underlying cancer development and progression.
Max ERC Funding
1 531 000 €
Duration
Start date: 2012-02-01, End date: 2017-01-31
Project acronym FastBio
Project A genomics and systems biology approach to explore the molecular signature and functional consequences of long-term, structured fasting in humans
Researcher (PI) Antigoni DIMA
Host Institution (HI) BIOMEDICAL SCIENCES RESEARCH CENTER ALEXANDER FLEMING
Call Details Starting Grant (StG), LS2, ERC-2016-STG
Summary Dietary intake has an enormous impact on aspects of human health, yet scientific consensus about how what we eat affects our biology remains elusive. To address the complex biological impact of diet, I propose to apply an unconventional, ‘humans-as-model-organisms’ approach to compare the molecular and functional effects of a highly structured dietary regime, specified by the Eastern Orthodox Christian Church (EOCC), to the unstructured diet followed by the general population. Individuals who follow the EOCC regime abstain from meat, dairy products and eggs for 180-200 days annually, in a temporally-structured manner initiated in childhood. I aim to explore the biological signatures of structured vs. unstructured diet by addressing three objectives. First I will investigate the effects of the two regimes, and of genetic variation, on higher-level phenotypes including anthropometric, physiological and biomarker traits. Second, I will carry out a comprehensive set of omics assays (metabolomics, transcriptomics, epigenomics and investigation of the gut microbiome), will associate omics phenotypes with genetic variation, and will integrate data across biological levels to uncover complex molecular signatures. Third, I will interrogate the functional consequences of dietary regimes at the cellular level through primary cell culture. Acute and long-term effects of dietary intake will be explored for all objectives through a two timepoint sampling strategy. This proposal therefore comprises a unique opportunity to study a specific perturbation (EOCC structured diet) introduced to a steady-state system (unstructured diet followed by the general population) in a ground-breaking human systems biology type of study. This approach brings together expertise from genomics, computational biology, statistics, medicine and epidemiology. It will lead to novel insights regarding the potent signalling nature of nutrients and is likely to yield results of high translational value.
Summary
Dietary intake has an enormous impact on aspects of human health, yet scientific consensus about how what we eat affects our biology remains elusive. To address the complex biological impact of diet, I propose to apply an unconventional, ‘humans-as-model-organisms’ approach to compare the molecular and functional effects of a highly structured dietary regime, specified by the Eastern Orthodox Christian Church (EOCC), to the unstructured diet followed by the general population. Individuals who follow the EOCC regime abstain from meat, dairy products and eggs for 180-200 days annually, in a temporally-structured manner initiated in childhood. I aim to explore the biological signatures of structured vs. unstructured diet by addressing three objectives. First I will investigate the effects of the two regimes, and of genetic variation, on higher-level phenotypes including anthropometric, physiological and biomarker traits. Second, I will carry out a comprehensive set of omics assays (metabolomics, transcriptomics, epigenomics and investigation of the gut microbiome), will associate omics phenotypes with genetic variation, and will integrate data across biological levels to uncover complex molecular signatures. Third, I will interrogate the functional consequences of dietary regimes at the cellular level through primary cell culture. Acute and long-term effects of dietary intake will be explored for all objectives through a two timepoint sampling strategy. This proposal therefore comprises a unique opportunity to study a specific perturbation (EOCC structured diet) introduced to a steady-state system (unstructured diet followed by the general population) in a ground-breaking human systems biology type of study. This approach brings together expertise from genomics, computational biology, statistics, medicine and epidemiology. It will lead to novel insights regarding the potent signalling nature of nutrients and is likely to yield results of high translational value.
Max ERC Funding
1 500 000 €
Duration
Start date: 2017-06-01, End date: 2022-05-31
Project acronym KRASHIMPE
Project KRas mutation interactions with host immunity in malignant pleural effusion
Researcher (PI) Georgios Stathopoulos
Host Institution (HI) PANEPISTIMIO PATRON
Call Details Starting Grant (StG), LS4, ERC-2010-StG_20091118
Summary Malignant pleural effusion (MPE) is a significant problem most commonly caused by adenocarcinomas. Although tumors involving the pleura vary in their ability to produce MPE, pathways critical for MPE formation are poorly defined. We have found that mouse tumors harboring mutant (”)KRas produce MPE in mice while tumors without ”KRas do not. LLC and MC38 lung and colon adenocarcinomas, potent inducers of MPE in syngeneic mice, harbor ”KRas that drives constitutive Ras and alternative nuclear factor (NF)-ºB signaling, inflammatory gene expression, and recruitment of specific myeloid cells to the pleural space. In contrast, mouse B16 melanoma and AE17 mesothelioma have wtKRas, lack constitutive Ras/alternative NF-º’ signaling, and are incapable of forming MPE. RNAi-mediated silencing of KRas in MC38 tumors abrogated MPE formation and Ras/alternative NF-º’ activation, while these phenomena were reconstituted in B16 tumors after KRas overexpression. We hypothesize that Ras-activating mutations drive the inflammatory phenotype of adenocarcinomas critical for MPE formation, which is characterized by Ras/alternative NF-ºB activation, inflammatory signalling to host vasculature/immune system, and recruitment of specific myeloid cells, and results in endothelial proliferation/leakiness. To test this hypothesis, we propose to: 1) define the relationship between Ras-activating mutations (RAM) and MPE formation; 2) identify tumor cell Ras-dependent signalling pathways and gene expression signature critical for MPE formation; 3) investigate the host response to tumor cells with RAM that results in MPE; and 4) target Ras and dependent signalling pathways as potential therapy for MPE. Studies will be performed using delivery of mouse/human tumors with/without RAM into the pleura of syngeneic/immunocompromized mice and are likely to yield new insights into the mechanisms of pleural tumor progression and to identify novel approaches to treatment of cancer patients with MPE.
Summary
Malignant pleural effusion (MPE) is a significant problem most commonly caused by adenocarcinomas. Although tumors involving the pleura vary in their ability to produce MPE, pathways critical for MPE formation are poorly defined. We have found that mouse tumors harboring mutant (”)KRas produce MPE in mice while tumors without ”KRas do not. LLC and MC38 lung and colon adenocarcinomas, potent inducers of MPE in syngeneic mice, harbor ”KRas that drives constitutive Ras and alternative nuclear factor (NF)-ºB signaling, inflammatory gene expression, and recruitment of specific myeloid cells to the pleural space. In contrast, mouse B16 melanoma and AE17 mesothelioma have wtKRas, lack constitutive Ras/alternative NF-º’ signaling, and are incapable of forming MPE. RNAi-mediated silencing of KRas in MC38 tumors abrogated MPE formation and Ras/alternative NF-º’ activation, while these phenomena were reconstituted in B16 tumors after KRas overexpression. We hypothesize that Ras-activating mutations drive the inflammatory phenotype of adenocarcinomas critical for MPE formation, which is characterized by Ras/alternative NF-ºB activation, inflammatory signalling to host vasculature/immune system, and recruitment of specific myeloid cells, and results in endothelial proliferation/leakiness. To test this hypothesis, we propose to: 1) define the relationship between Ras-activating mutations (RAM) and MPE formation; 2) identify tumor cell Ras-dependent signalling pathways and gene expression signature critical for MPE formation; 3) investigate the host response to tumor cells with RAM that results in MPE; and 4) target Ras and dependent signalling pathways as potential therapy for MPE. Studies will be performed using delivery of mouse/human tumors with/without RAM into the pleura of syngeneic/immunocompromized mice and are likely to yield new insights into the mechanisms of pleural tumor progression and to identify novel approaches to treatment of cancer patients with MPE.
Max ERC Funding
1 995 000 €
Duration
Start date: 2011-04-01, End date: 2016-03-31
Project acronym MANNA
Project MacroAutophagy and Necrotic Neurodegeneration in Ageing
Researcher (PI) Nektarios TAVERNARAKIS
Host Institution (HI) IDRYMA TECHNOLOGIAS KAI EREVNAS
Call Details Advanced Grant (AdG), LS4, ERC-2015-AdG
Summary Necrosis contributes critically in devastating human pathologies such as stroke, ischemia, and age-associated neurodegenerative disorders. Ageing increases susceptibility to neurodegeneration, in diverse species ranging from the lowly nematode Caenorhabditis elegans to humans. The mechanisms that govern necrotic neurodegeneration and its modulation by ageing are poorly understood. Autophagy has been implicated in necrosis and neurodegeneration, both with pro-survival and a pro-death roles. Autophagic flux declines with age, while induction of autophagy enhances longevity under conditions such as low insulin/IGF1 signalling and dietary restriction, which extend lifespan across diverse taxa. Our recent findings indicate that organelle-specific autophagy, including mitophagy, pexophagy and nucleophagy, is an important, evolutionarily conserved, determinant of longevity. We propose to dissect the molecular underpinnings of neuron vulnerability to necrosis during ageing, focusing on cargo-specific macroautophagy. To this end, we will implement a multifaceted approach that combines the power and versatility of C. elegans genetics with advanced, in vivo neuronal imaging and microfluidics technology. Our objectives are fourfold. First, we will monitor autophagic flux of organellar cargo, during neurodegeneration, under conditions that alter lifespan and identify mediators of organelle-specific autophagy in neurons. Second, we will conduct genome-wide screens for modifiers of age-inflicted neurodegeneration. Third, we will interrogate nematode models of human neurodegenerative disorders for organelle-specific autophagy and susceptibility to necrosis, upon manipulations that alter lifespan. Fourth, we will investigate the functional conservation of key mechanisms in mammalian models of neuronal necrosis. Together, these studies will deepen our understanding of age-related neurodegeneration and provide critical insights with broad relevance to human health and quality of life.
Summary
Necrosis contributes critically in devastating human pathologies such as stroke, ischemia, and age-associated neurodegenerative disorders. Ageing increases susceptibility to neurodegeneration, in diverse species ranging from the lowly nematode Caenorhabditis elegans to humans. The mechanisms that govern necrotic neurodegeneration and its modulation by ageing are poorly understood. Autophagy has been implicated in necrosis and neurodegeneration, both with pro-survival and a pro-death roles. Autophagic flux declines with age, while induction of autophagy enhances longevity under conditions such as low insulin/IGF1 signalling and dietary restriction, which extend lifespan across diverse taxa. Our recent findings indicate that organelle-specific autophagy, including mitophagy, pexophagy and nucleophagy, is an important, evolutionarily conserved, determinant of longevity. We propose to dissect the molecular underpinnings of neuron vulnerability to necrosis during ageing, focusing on cargo-specific macroautophagy. To this end, we will implement a multifaceted approach that combines the power and versatility of C. elegans genetics with advanced, in vivo neuronal imaging and microfluidics technology. Our objectives are fourfold. First, we will monitor autophagic flux of organellar cargo, during neurodegeneration, under conditions that alter lifespan and identify mediators of organelle-specific autophagy in neurons. Second, we will conduct genome-wide screens for modifiers of age-inflicted neurodegeneration. Third, we will interrogate nematode models of human neurodegenerative disorders for organelle-specific autophagy and susceptibility to necrosis, upon manipulations that alter lifespan. Fourth, we will investigate the functional conservation of key mechanisms in mammalian models of neuronal necrosis. Together, these studies will deepen our understanding of age-related neurodegeneration and provide critical insights with broad relevance to human health and quality of life.
Max ERC Funding
2 254 109 €
Duration
Start date: 2017-01-01, End date: 2021-12-31
Project acronym MCs-inTEST
Project Mesenchymal Cells of the Lamina Propria in Intestinal Epithelial and Immunological Homeostasis
Researcher (PI) Georgios Kollias
Host Institution (HI) BIOMEDICAL SCIENCES RESEARCH CENTER ALEXANDER FLEMING
Call Details Advanced Grant (AdG), LS6, ERC-2013-ADG
Summary Mesenchymal cells (MCs) of the intestinal lamina propria refer to a variety of cell types, most commonly intestinal myofibroblasts, fibroblasts, pericytes, and mesenchymal stromal cells, which show many similarities in terms of origin, function and molecular markers. Understanding the physiological significance of MCs in epithelial and immunological homeostasis and the pathophysiology of chronic intestinal inflammatory and neoplastic disease remains a great challenge.
In this proposal, we put forward the challenging hypothesis that, especially during acute or chronic inflammatory and tumorigenic conditions, MCs play important physiological roles in intestinal homeostasis regulating key processes such as epithelial damage, regeneration and tumorigenesis, intestinal inflammation and lymphoid tissue formation. We further posit that a unifying principle underlying such functions would be the innate character of MCs, which we hypothesize are capable of directly sensing and metabolizing innate signals from microbiota or cytokines in order to exert homeostatic epithelial and immunological regulatory functions in the intestine.
We will be using genetic approaches to target innate pathways in MCs and state of the art phenotyping to discover the physiologically important signals orchestrating intestinal homeostasis in various animal models of intestinal pathophysiology. We will also study MC lineage relations and plasticity during disease and develop ways to interfere therapeutically with MC physiology to achieve translational added value for intestinal diseases, as well as for a range of other pathologies sharing similar characteristics.
Summary
Mesenchymal cells (MCs) of the intestinal lamina propria refer to a variety of cell types, most commonly intestinal myofibroblasts, fibroblasts, pericytes, and mesenchymal stromal cells, which show many similarities in terms of origin, function and molecular markers. Understanding the physiological significance of MCs in epithelial and immunological homeostasis and the pathophysiology of chronic intestinal inflammatory and neoplastic disease remains a great challenge.
In this proposal, we put forward the challenging hypothesis that, especially during acute or chronic inflammatory and tumorigenic conditions, MCs play important physiological roles in intestinal homeostasis regulating key processes such as epithelial damage, regeneration and tumorigenesis, intestinal inflammation and lymphoid tissue formation. We further posit that a unifying principle underlying such functions would be the innate character of MCs, which we hypothesize are capable of directly sensing and metabolizing innate signals from microbiota or cytokines in order to exert homeostatic epithelial and immunological regulatory functions in the intestine.
We will be using genetic approaches to target innate pathways in MCs and state of the art phenotyping to discover the physiologically important signals orchestrating intestinal homeostasis in various animal models of intestinal pathophysiology. We will also study MC lineage relations and plasticity during disease and develop ways to interfere therapeutically with MC physiology to achieve translational added value for intestinal diseases, as well as for a range of other pathologies sharing similar characteristics.
Max ERC Funding
2 590 000 €
Duration
Start date: 2014-07-01, End date: 2019-06-30
Project acronym NEURONAGE
Project Molecular Basis of Neuronal Ageing
Researcher (PI) Nektarios Tavernarakis
Host Institution (HI) IDRYMA TECHNOLOGIAS KAI EREVNAS
Call Details Advanced Grant (AdG), LS4, ERC-2008-AdG
Summary Ageing is associated with marked decrease of neuronal function and increased susceptibility to neurodegeneration, in organisms as diverse as the lowly worm Caenorhabditis elegans and humans. Although, age-related deterioration of the nervous system is a universal phenomenon, its cellular and molecular underpinnings remain obscure. What mechanisms are responsible for the detrimental effects of ageing on neuronal function? The aim of the proposed research programme is to address this fundamental problem. We will implement an interdisciplinary approach, combining the power of C. elegans, a highly malleable genetic model which offers a precisely defined nervous system, with state-of-the-art microfluidics and optical imaging technologies, to manipulate and monitor neuronal activity during ageing, in vivo. Our objectives are four-fold. First, develop a microfluidics platform for high-throughput manipulation and imaging of specific neurons in individual animals, in vivo. Second, use the platform to monitor neuronal function during ageing in isogenic populations of wild type animals, long-lived mutants and animals under caloric restriction, a condition known to extend lifespan from yeast to primates. Third, examine how ageing modulates susceptibility to neuronal damage in nematode models of human neurodegenerative disorders. Fourth, conduct both forward and reverse genetic screens for modifiers of resistance to ageing-inflicted neuronal function decline. We will seek to identify and thoroughly characterize genes and molecular pathways involved in neuron deterioration during ageing. Ultimately, we will investigate the functional conservation of key isolated factors in more complex ageing models such as Drosophila and the mouse. Together, these studies will lead to an unprecedented understanding of age-related breakdown of neuronal function and will provide critical insights with broad relevance to human health and quality of life.
Summary
Ageing is associated with marked decrease of neuronal function and increased susceptibility to neurodegeneration, in organisms as diverse as the lowly worm Caenorhabditis elegans and humans. Although, age-related deterioration of the nervous system is a universal phenomenon, its cellular and molecular underpinnings remain obscure. What mechanisms are responsible for the detrimental effects of ageing on neuronal function? The aim of the proposed research programme is to address this fundamental problem. We will implement an interdisciplinary approach, combining the power of C. elegans, a highly malleable genetic model which offers a precisely defined nervous system, with state-of-the-art microfluidics and optical imaging technologies, to manipulate and monitor neuronal activity during ageing, in vivo. Our objectives are four-fold. First, develop a microfluidics platform for high-throughput manipulation and imaging of specific neurons in individual animals, in vivo. Second, use the platform to monitor neuronal function during ageing in isogenic populations of wild type animals, long-lived mutants and animals under caloric restriction, a condition known to extend lifespan from yeast to primates. Third, examine how ageing modulates susceptibility to neuronal damage in nematode models of human neurodegenerative disorders. Fourth, conduct both forward and reverse genetic screens for modifiers of resistance to ageing-inflicted neuronal function decline. We will seek to identify and thoroughly characterize genes and molecular pathways involved in neuron deterioration during ageing. Ultimately, we will investigate the functional conservation of key isolated factors in more complex ageing models such as Drosophila and the mouse. Together, these studies will lead to an unprecedented understanding of age-related breakdown of neuronal function and will provide critical insights with broad relevance to human health and quality of life.
Max ERC Funding
2 376 000 €
Duration
Start date: 2009-05-01, End date: 2015-04-30
Project acronym NEUROPHAGY
Project The Role of Autophagy in Synaptic Plasticity
Researcher (PI) Vassiliki NIKOLETOPOULOU
Host Institution (HI) IDRYMA TECHNOLOGIAS KAI EREVNAS
Call Details Starting Grant (StG), LS5, ERC-2016-STG
Summary Neuronal metabolism is emerging as an essential regulator of brain function and its deregulation is a common denominator in neurological disorders entailing intellectual disability and synapse dys-morphogenesis. The autophagy-lysosome system is the major catabolic pathway dedicated to the recycling not only of protein aggregates but also lipids, nucleic acids, polysaccharides and defective or superfluous organelles, among others.
Appreciation of the role of autophagic pathways in the healthy and diseased brain continues to expand, as accumulating evidence indicates that proper regulation of autophagy is indispensable for neuronal integrity. At the cellular level, several lines of evidence implicate autophagy in the regulation of synaptic plasticity. However, the synapse-specific substrates of autophagy remain elusive. Similarly, the synaptic defects arising from autophagy impairment have never been thus far systematically addressed, yet they translate into severe behavioural deficiencies, such as compromised memory and cognition, pertinent to disorders of intellectual disability.
The present proposal aims to determine how autophagy regulates synaptic plasticity and how its deregulation contributes to synaptic defects. In particular, the objectives aim to: 1) Monitor and characterize the presence of the autophagic machinery in pre- and post-synaptic sites. 2) Identify autophagic substrates residing in synapses and whose turnover via autophagy determines synaptic plasticity. 3) Characterize the synaptic defects and ensuing behavioural deficits arising from impaired autophagy in the hippocampus. 4) Use C. elegans as a model system to address the evolutionary conservation of the synaptic role of autophagy and perform forward genetic screens to reveal novel regulators of autophagy in synapses.
Summary
Neuronal metabolism is emerging as an essential regulator of brain function and its deregulation is a common denominator in neurological disorders entailing intellectual disability and synapse dys-morphogenesis. The autophagy-lysosome system is the major catabolic pathway dedicated to the recycling not only of protein aggregates but also lipids, nucleic acids, polysaccharides and defective or superfluous organelles, among others.
Appreciation of the role of autophagic pathways in the healthy and diseased brain continues to expand, as accumulating evidence indicates that proper regulation of autophagy is indispensable for neuronal integrity. At the cellular level, several lines of evidence implicate autophagy in the regulation of synaptic plasticity. However, the synapse-specific substrates of autophagy remain elusive. Similarly, the synaptic defects arising from autophagy impairment have never been thus far systematically addressed, yet they translate into severe behavioural deficiencies, such as compromised memory and cognition, pertinent to disorders of intellectual disability.
The present proposal aims to determine how autophagy regulates synaptic plasticity and how its deregulation contributes to synaptic defects. In particular, the objectives aim to: 1) Monitor and characterize the presence of the autophagic machinery in pre- and post-synaptic sites. 2) Identify autophagic substrates residing in synapses and whose turnover via autophagy determines synaptic plasticity. 3) Characterize the synaptic defects and ensuing behavioural deficits arising from impaired autophagy in the hippocampus. 4) Use C. elegans as a model system to address the evolutionary conservation of the synaptic role of autophagy and perform forward genetic screens to reveal novel regulators of autophagy in synapses.
Max ERC Funding
1 493 750 €
Duration
Start date: 2017-03-01, End date: 2022-02-28
Project acronym OPN-IMMUNOREGULATION
Project Immune mechanisms of osteopontin-mediated protection in allergic airway disease
Researcher (PI) Vasiliki Panoutsakopoulou
Host Institution (HI) IDRYMA IATROVIOLOGIKON EREUNON AKADEMIAS ATHINON
Call Details Starting Grant (StG), LS6, ERC-2009-StG
Summary In allergic asthma, an important health problem, disease is driven by allergen-specific Th2 immune responses. Differentiation of Th2 cells depends on their early interactions with antigen presenting cells, such as dendritic cells (DCs), and cytokines are crucial for this process. Osteopontin (Opn) was originally identified as an important cytokine for Th1 immunity and autoimmunity. Our group recently demonstrated that Opn is highly expressed in the lungs of asthmatic patients and of mice with Th2-mediated allergic airway inflammation. Our work revealed anti-allergic effects of Opn on airway disease during secondary pulmonary antigenic challenge mediated by regulation of DC subsets. In addition, intranasal administration of recombinant Opn during pulmonary exposure to the allergen protected mice from allergic airway disease suppressing all features of disease, recruitment of Th2 cells and allergen-specific Th2 responses. Our previous experiments, as well as preliminary studies presented in this proposal, point to an important novel immunoregulatory role for Opn in the Th2 setting. However, most aspects of the Opn-mediated immune mechanism of protection remain unclear. With this proposal, we aim at elucidating the immunoregulatory/protective mechanisms of Opn utilizing immunologic, molecular and genomic approaches as well as in vivo mouse models of allergic airway inflammation. We propose to investigate the mechanisms mediating Opn-effects on: (1) DC subsets and Treg cells that confer protection during pulmonary allergen challenge (2) recruitment and function of allergen-specific Th2 (generated during sensitization) as well as of newly-activated Th effector cells and their interactions during pulmonary allergen challenge and (3) antigenic tolerance induction in the Th2 setting. The studies proposed here will provide new insight into the biology of Opn-dependent regulation of DC subsets, Th2 responses and DC-T cell interactions opening new important questions in im
Summary
In allergic asthma, an important health problem, disease is driven by allergen-specific Th2 immune responses. Differentiation of Th2 cells depends on their early interactions with antigen presenting cells, such as dendritic cells (DCs), and cytokines are crucial for this process. Osteopontin (Opn) was originally identified as an important cytokine for Th1 immunity and autoimmunity. Our group recently demonstrated that Opn is highly expressed in the lungs of asthmatic patients and of mice with Th2-mediated allergic airway inflammation. Our work revealed anti-allergic effects of Opn on airway disease during secondary pulmonary antigenic challenge mediated by regulation of DC subsets. In addition, intranasal administration of recombinant Opn during pulmonary exposure to the allergen protected mice from allergic airway disease suppressing all features of disease, recruitment of Th2 cells and allergen-specific Th2 responses. Our previous experiments, as well as preliminary studies presented in this proposal, point to an important novel immunoregulatory role for Opn in the Th2 setting. However, most aspects of the Opn-mediated immune mechanism of protection remain unclear. With this proposal, we aim at elucidating the immunoregulatory/protective mechanisms of Opn utilizing immunologic, molecular and genomic approaches as well as in vivo mouse models of allergic airway inflammation. We propose to investigate the mechanisms mediating Opn-effects on: (1) DC subsets and Treg cells that confer protection during pulmonary allergen challenge (2) recruitment and function of allergen-specific Th2 (generated during sensitization) as well as of newly-activated Th effector cells and their interactions during pulmonary allergen challenge and (3) antigenic tolerance induction in the Th2 setting. The studies proposed here will provide new insight into the biology of Opn-dependent regulation of DC subsets, Th2 responses and DC-T cell interactions opening new important questions in im
Max ERC Funding
1 511 200 €
Duration
Start date: 2009-12-01, End date: 2015-11-30
