Project acronym ERMITO
Project Molecular Anatomy and Pathophysiology of the endoplasmic reticulum-mitochondria interface
Researcher (PI) Luca Scorrano
Host Institution (HI) UNIVERSITA DEGLI STUDI DI PADOVA
Call Details Starting Grant (StG), LS3, ERC-2011-StG_20101109
Summary Organelles are not randomly organized in the cytoplasm of the cell, but often are orderly arranged in mutual relationships that depend on physical, protein bounds. Understanding the molecular nature of the tethers that regulate relative position and juxtaposition of the organelles is one of the main quests of cell biology, given their functional importance. For example, the juxtaposition between mitochondria and endoplasmic reticulum (ER) has been suggested by us and others to crucially impact on Ca2+ signalling and apoptosis. We recently identified the first structural ER-mitochondrial tether in mitofusin 2 (Mfn2), a pro-fusion mitochondria-shaping protein. A fraction of Mfn2 is also located on the ER regulating its morphology, and acting in trans to tether it to mitochondria. The tethering function of Mfn2 impacts on the transmission of Ca2+ signals between the two organelles and is regulated by the oncosuppressor trichoplein/mitostatin. Mfn2 is likely only one of the tethers, as others exist in yeast. Furthermore, the dynamicity of the ER-mitochondria contact is known, but remains poorly understood. Therefore, a clear picture of the anatomy and pathophsyiology of ER-mitochondrial connection is far from being reached.
Here we hypothesize that ER-mitochondrial contacts are crucial specialized hubs of cellular signalling whose architecture is modulated by cellular cues, impacting on integrated signalling cascades and ultimately affecting cellular function. To address this hypothesis we wish to setup a research project that aims at (i) increasing our knowledge on the molecular nature of tethers and modulators of ER-mitochondrial tethers in mammalian cells; (ii) clarifying how mitochondrial and ER function are controlled by the tethering; (iii) addressing how juxtaposition influences complex cellular responses including autophagy and cell death; (iv) elucidating the role of tethering in vivo by generating animal models with defined ER-mitochondrial distance.
Summary
Organelles are not randomly organized in the cytoplasm of the cell, but often are orderly arranged in mutual relationships that depend on physical, protein bounds. Understanding the molecular nature of the tethers that regulate relative position and juxtaposition of the organelles is one of the main quests of cell biology, given their functional importance. For example, the juxtaposition between mitochondria and endoplasmic reticulum (ER) has been suggested by us and others to crucially impact on Ca2+ signalling and apoptosis. We recently identified the first structural ER-mitochondrial tether in mitofusin 2 (Mfn2), a pro-fusion mitochondria-shaping protein. A fraction of Mfn2 is also located on the ER regulating its morphology, and acting in trans to tether it to mitochondria. The tethering function of Mfn2 impacts on the transmission of Ca2+ signals between the two organelles and is regulated by the oncosuppressor trichoplein/mitostatin. Mfn2 is likely only one of the tethers, as others exist in yeast. Furthermore, the dynamicity of the ER-mitochondria contact is known, but remains poorly understood. Therefore, a clear picture of the anatomy and pathophsyiology of ER-mitochondrial connection is far from being reached.
Here we hypothesize that ER-mitochondrial contacts are crucial specialized hubs of cellular signalling whose architecture is modulated by cellular cues, impacting on integrated signalling cascades and ultimately affecting cellular function. To address this hypothesis we wish to setup a research project that aims at (i) increasing our knowledge on the molecular nature of tethers and modulators of ER-mitochondrial tethers in mammalian cells; (ii) clarifying how mitochondrial and ER function are controlled by the tethering; (iii) addressing how juxtaposition influences complex cellular responses including autophagy and cell death; (iv) elucidating the role of tethering in vivo by generating animal models with defined ER-mitochondrial distance.
Max ERC Funding
1 499 995 €
Duration
Start date: 2012-01-01, End date: 2016-12-31
Project acronym ESEARCH
Project Direct Empirical Evidence on Labor Market Search Theories
Researcher (PI) Thomas LE BARBANCHON
Host Institution (HI) UNIVERSITA COMMERCIALE LUIGI BOCCONI
Call Details Starting Grant (StG), SH1, ERC-2017-STG
Summary Our project proposes to provide new empirical evidence on the search strategies of both job seekers and of recruiters in the labor market. This evidence will enhance our understanding of the information asymmetries at the root of search frictions.
We will leverage the extraordinary opportunities offered by online job boards, which record search activities in details. We will match for the first time these data with administrative data from unemployment-employment registers. This will enable us to jointly observe search activity and core economic outcomes (wage, job duration) on very large samples.
We will design randomized controlled trials, where we recommend new matches to both job seekers and recruiters. This will test for the extent of geographical and skill mismatch in the labor market. We will further test the assumptions of directed search models by displaying to job seekers the real-time length of the queue in front of vacancies. Finally, we will use new item-to-item collaborative filtering algorithms (amazon-type recommendations) to quantify the social value of the private information that job seekers gather when they screen vacancies.
Using quasi-experimental research designs, we will provide the first precise estimates of the direct and cross effects of search subsidies - unemployment insurance and reduction in vacancy advertising costs - on the search strategies of both sides of the market. We will then test the empirical relevance of behavioral mechanisms, such as reference-dependence or over-optimism.
We expect our direct empirical evidence on search strategies to trigger new developments in search theories. Our results will guide policy-makers who design job boards and search subsidies to both recruiters and job seekers. We hope that the social impact of our research will be to reduce frictional unemployment and to increase the productivity of workers through a reduction of mismatch in the labor market.
Summary
Our project proposes to provide new empirical evidence on the search strategies of both job seekers and of recruiters in the labor market. This evidence will enhance our understanding of the information asymmetries at the root of search frictions.
We will leverage the extraordinary opportunities offered by online job boards, which record search activities in details. We will match for the first time these data with administrative data from unemployment-employment registers. This will enable us to jointly observe search activity and core economic outcomes (wage, job duration) on very large samples.
We will design randomized controlled trials, where we recommend new matches to both job seekers and recruiters. This will test for the extent of geographical and skill mismatch in the labor market. We will further test the assumptions of directed search models by displaying to job seekers the real-time length of the queue in front of vacancies. Finally, we will use new item-to-item collaborative filtering algorithms (amazon-type recommendations) to quantify the social value of the private information that job seekers gather when they screen vacancies.
Using quasi-experimental research designs, we will provide the first precise estimates of the direct and cross effects of search subsidies - unemployment insurance and reduction in vacancy advertising costs - on the search strategies of both sides of the market. We will then test the empirical relevance of behavioral mechanisms, such as reference-dependence or over-optimism.
We expect our direct empirical evidence on search strategies to trigger new developments in search theories. Our results will guide policy-makers who design job boards and search subsidies to both recruiters and job seekers. We hope that the social impact of our research will be to reduce frictional unemployment and to increase the productivity of workers through a reduction of mismatch in the labor market.
Max ERC Funding
1 250 250 €
Duration
Start date: 2018-04-01, End date: 2023-03-31
Project acronym EXTREME
Project The Rise and Fall of Populism and Extremism
Researcher (PI) Maria PETROVA
Host Institution (HI) UNIVERSIDAD POMPEU FABRA
Call Details Starting Grant (StG), SH1, ERC-2018-STG
Summary In the recent years in advanced democracies there has been a wave of electoral successes of populist politicians supporting extreme messages. Is populism caused by negative economic shocks? If so, what are the mechanisms? What explains heterogeneity in responses to such shocks? In this project, I will test empirically if personal experiences, information environment, and their interaction with aggregate economic shocks shape people’s political decisions. The project consists of three parts.
First, I will study how personal employment histories, potentially affected by globalization and technological shocks, individual predispositions, and information environment influenced voting for Trump. I will use a unique database of more than 40 million resumes for the period 2010-2016, the largest available repository of resumes of job-seekers in the US, which was not previously used in academic research, and match it with zipcode-level economic and voting variables.
Second, I will study how negative social experiences during the formative years affect subsequent labor market outcomes, antisocial behavior, and the support of populist agenda. I will examine how corporal punishment in schools in UK affected subsequent educational attainment, employment, antisocial behavior, and voting for UKIP and Brexit. I will digitize archival records on regulations and practice of corporal punishment in different educational authorities in the UK during 1970-80s, combining it with contemporary outcomes.
Third, I will examine what makes people actively resist extremist regimes even when it is associated with high personal costs. I will study a historical example of resistance to Nazi regime in Germany during the WWII, which provides unique methodological opportunity to study determinants of resistance to extremism in a high stake environment. I will use a self-collected dataset on treason cases to measure resistance, combining it with data on bombing and exposure to foreign propaganda.
Summary
In the recent years in advanced democracies there has been a wave of electoral successes of populist politicians supporting extreme messages. Is populism caused by negative economic shocks? If so, what are the mechanisms? What explains heterogeneity in responses to such shocks? In this project, I will test empirically if personal experiences, information environment, and their interaction with aggregate economic shocks shape people’s political decisions. The project consists of three parts.
First, I will study how personal employment histories, potentially affected by globalization and technological shocks, individual predispositions, and information environment influenced voting for Trump. I will use a unique database of more than 40 million resumes for the period 2010-2016, the largest available repository of resumes of job-seekers in the US, which was not previously used in academic research, and match it with zipcode-level economic and voting variables.
Second, I will study how negative social experiences during the formative years affect subsequent labor market outcomes, antisocial behavior, and the support of populist agenda. I will examine how corporal punishment in schools in UK affected subsequent educational attainment, employment, antisocial behavior, and voting for UKIP and Brexit. I will digitize archival records on regulations and practice of corporal punishment in different educational authorities in the UK during 1970-80s, combining it with contemporary outcomes.
Third, I will examine what makes people actively resist extremist regimes even when it is associated with high personal costs. I will study a historical example of resistance to Nazi regime in Germany during the WWII, which provides unique methodological opportunity to study determinants of resistance to extremism in a high stake environment. I will use a self-collected dataset on treason cases to measure resistance, combining it with data on bombing and exposure to foreign propaganda.
Max ERC Funding
1 467 736 €
Duration
Start date: 2019-01-01, End date: 2023-12-31
Project acronym FINIMPMACRO
Project Financial Imperfections and Macroeconomic Implications
Researcher (PI) Tommaso Monacelli
Host Institution (HI) UNIVERSITA COMMERCIALE LUIGI BOCCONI
Call Details Starting Grant (StG), SH1, ERC-2011-StG_20101124
Summary We plan to study the implications of financial market imperfections for four main questions.
First, how do financial imperfections affect the optimal conduct of monetary and exchange rate policy in open economies? A key insight is that we characterize financial frictions as endogenous and only occasionally binding. This can have important implications for the optimal conduct of stabilization policy.
Second, how do financial and labor market imperfections interact? We extend the standard search-and-matching model to allow firms to issue debt. This feature affects the wage bargaining process endogenously, since firms, by leveraging, can pay lower wages. We study the ability of such a model to replicate the volatility and persistence of unemployment in the data, and the role of financial imperfections in affecting the transmission of productivity and financial shocks.
Third, does the effectiveness of tax policy depend on its redistributive content, and how is this affected by financial imperfections? We characterize the distributional feature of several Tax Acts in the US, and investigate empirically whether tax changes that “favor the poor” are more expansionary than cuts that “favor the rich”. We then build a theoretical framework with heterogeneous agents and financial frictions to rationalize our evidence.
Fourth, how do financial intermediaries affect the transmission channel of monetary policy? We extend the current New Keynesian framework for monetary policy analysis to study the role of financial intermediaries. We emphasize the role of three features: (i) asymmetric information in interbank markets; (ii) maturity mismatch in the banks’ balance sheets; (iii) the “paradox of securitization”, thereby a deeper diversification of idiosyncratic risk leads to a simultaneous increase in the sensitivity of banks’ balance sheets to aggregate risk.
Summary
We plan to study the implications of financial market imperfections for four main questions.
First, how do financial imperfections affect the optimal conduct of monetary and exchange rate policy in open economies? A key insight is that we characterize financial frictions as endogenous and only occasionally binding. This can have important implications for the optimal conduct of stabilization policy.
Second, how do financial and labor market imperfections interact? We extend the standard search-and-matching model to allow firms to issue debt. This feature affects the wage bargaining process endogenously, since firms, by leveraging, can pay lower wages. We study the ability of such a model to replicate the volatility and persistence of unemployment in the data, and the role of financial imperfections in affecting the transmission of productivity and financial shocks.
Third, does the effectiveness of tax policy depend on its redistributive content, and how is this affected by financial imperfections? We characterize the distributional feature of several Tax Acts in the US, and investigate empirically whether tax changes that “favor the poor” are more expansionary than cuts that “favor the rich”. We then build a theoretical framework with heterogeneous agents and financial frictions to rationalize our evidence.
Fourth, how do financial intermediaries affect the transmission channel of monetary policy? We extend the current New Keynesian framework for monetary policy analysis to study the role of financial intermediaries. We emphasize the role of three features: (i) asymmetric information in interbank markets; (ii) maturity mismatch in the banks’ balance sheets; (iii) the “paradox of securitization”, thereby a deeper diversification of idiosyncratic risk leads to a simultaneous increase in the sensitivity of banks’ balance sheets to aggregate risk.
Max ERC Funding
778 800 €
Duration
Start date: 2012-01-01, End date: 2016-12-31
Project acronym FLARE
Project Floral Integrating Networks at the Shoot Apical Meristem of Rice
Researcher (PI) Fabio Fornara
Host Institution (HI) UNIVERSITA DEGLI STUDI DI MILANO
Call Details Starting Grant (StG), LS9, ERC-2010-StG_20091118
Summary Discriminating differences in day length is critical for many organisms to synchronize reproduction with the most favourable season of the year. Plants have evolved sophisticated time-keeping mechanisms that largely work in leaves, to measure the duration of the day. Upon perception of favourable day lengths, a leaf-borne signal moves to the shoot apical meristem to induce flower formation. Rice is a crop whose yield heavily depends on flowering at the right time, and genetic variation within leaf regulators contributes to diversification of flowering responses among different rice varieties. However, how the shoot apical meristem responds to changes in day length and initiates flowering is currently unknown. High-yielding European rice varieties flower within a limited range of days and expanding such range would prove beneficial to increase yield and expand cultivation to different environments. Our goal is to identify novel genes that modify meristem sensitivity to day length, and breed them into high-yielding cultivars. Together with the gene pool controlling day length responses in the leaves, these novel alleles will allow to design varieties with diverse sensitivities to photoperiod and will distribute the reproductive phase over a broader period of time. This knowledge-based breeding will require preliminary studies in order to identify regulators acting in the shoot apical meristem. To this extent, rice provides an excellent biological model for the availability of powerful genetic and molecular tools. I am proposing a number of genetic and biochemical screens that will allow us to explore the rice genome for genes required at the shoot apical meristem to drive reproductive phase transitions. We will investigate genetic variation in these components, relate it to flowering and adaptation, and use it for introgressing novel alleles into elite germplasm.
Summary
Discriminating differences in day length is critical for many organisms to synchronize reproduction with the most favourable season of the year. Plants have evolved sophisticated time-keeping mechanisms that largely work in leaves, to measure the duration of the day. Upon perception of favourable day lengths, a leaf-borne signal moves to the shoot apical meristem to induce flower formation. Rice is a crop whose yield heavily depends on flowering at the right time, and genetic variation within leaf regulators contributes to diversification of flowering responses among different rice varieties. However, how the shoot apical meristem responds to changes in day length and initiates flowering is currently unknown. High-yielding European rice varieties flower within a limited range of days and expanding such range would prove beneficial to increase yield and expand cultivation to different environments. Our goal is to identify novel genes that modify meristem sensitivity to day length, and breed them into high-yielding cultivars. Together with the gene pool controlling day length responses in the leaves, these novel alleles will allow to design varieties with diverse sensitivities to photoperiod and will distribute the reproductive phase over a broader period of time. This knowledge-based breeding will require preliminary studies in order to identify regulators acting in the shoot apical meristem. To this extent, rice provides an excellent biological model for the availability of powerful genetic and molecular tools. I am proposing a number of genetic and biochemical screens that will allow us to explore the rice genome for genes required at the shoot apical meristem to drive reproductive phase transitions. We will investigate genetic variation in these components, relate it to flowering and adaptation, and use it for introgressing novel alleles into elite germplasm.
Max ERC Funding
1 499 880 €
Duration
Start date: 2011-04-01, End date: 2016-03-31
Project acronym FlyGutHomeostasis
Project Identification of paracrine and systemic signals controlling adult stem cell activity and organ homeostasis
Researcher (PI) Ditte ANDERSEN
Host Institution (HI) KOBENHAVNS UNIVERSITET
Call Details Starting Grant (StG), LS3, ERC-2018-STG
Summary Due to its remarkable self-renewing capacity, the fly gut has recently become a prime paradigm for studying stem-cell function during adult tissue homeostasis. This capacity for self-renewal relays on the proliferative activity of the intestinal stem cells (ISC), which is tightly coupled with cell loss to maintain intestinal homeostasis. ISC proliferation is controlled by multiple local and systemic signals released from the ISC niche (enterocytes (ECs), enteroendocrine (EE) cells, enteroblasts (EBs), and visceral muscles (VMs)) and non-gastrointestinal (non-GI) organs. Despite the physiological divergence between insects and mammals, studies have shown that flies represent a model that is well suited for studying stem cell physiology during ageing, stress, and infection. As a saturating approach to identify local and systemic signals controlling intestinal homeostasis in steady-state and challenged conditions, RNAis will be used to known down all genes encoding secreted peptides specifically in ECs, EEs, or VMs and all genes encoding transmembrane and membrane-associated proteins in the VMs. The proposed screens should identify novel intra- and inter-organ circuitries allowing communication between the gut and other organs to provide organismal health. In addition, the systematic knockdown of secreted peptides from the ISC niche could identify gut-derived signals that couple changes in environmental inputs, such as nutrient availability, with systemic changes in feeding behavior, energy balance, and metabolism. Since large-scale approaches are not feasible in vertebrate models, the signals identified in the above screens could potentially reveal novel couplings contributing to mammalian GI homeostasis and disease. The final part of the proposed project aims a deciphering the molecular signals coupling epithelial fitness with ligand-independent TNFR activation to control ISC division and epithelial turnover in steady-state, challenged and pathological conditions.
Summary
Due to its remarkable self-renewing capacity, the fly gut has recently become a prime paradigm for studying stem-cell function during adult tissue homeostasis. This capacity for self-renewal relays on the proliferative activity of the intestinal stem cells (ISC), which is tightly coupled with cell loss to maintain intestinal homeostasis. ISC proliferation is controlled by multiple local and systemic signals released from the ISC niche (enterocytes (ECs), enteroendocrine (EE) cells, enteroblasts (EBs), and visceral muscles (VMs)) and non-gastrointestinal (non-GI) organs. Despite the physiological divergence between insects and mammals, studies have shown that flies represent a model that is well suited for studying stem cell physiology during ageing, stress, and infection. As a saturating approach to identify local and systemic signals controlling intestinal homeostasis in steady-state and challenged conditions, RNAis will be used to known down all genes encoding secreted peptides specifically in ECs, EEs, or VMs and all genes encoding transmembrane and membrane-associated proteins in the VMs. The proposed screens should identify novel intra- and inter-organ circuitries allowing communication between the gut and other organs to provide organismal health. In addition, the systematic knockdown of secreted peptides from the ISC niche could identify gut-derived signals that couple changes in environmental inputs, such as nutrient availability, with systemic changes in feeding behavior, energy balance, and metabolism. Since large-scale approaches are not feasible in vertebrate models, the signals identified in the above screens could potentially reveal novel couplings contributing to mammalian GI homeostasis and disease. The final part of the proposed project aims a deciphering the molecular signals coupling epithelial fitness with ligand-independent TNFR activation to control ISC division and epithelial turnover in steady-state, challenged and pathological conditions.
Max ERC Funding
1 498 964 €
Duration
Start date: 2019-02-01, End date: 2024-01-31
Project acronym FRICTIONS
Project Financial Frictions
Researcher (PI) Lasse Heje Pedersen
Host Institution (HI) COPENHAGEN BUSINESS SCHOOL
Call Details Starting Grant (StG), SH1, ERC-2012-StG_20111124
Summary "Financial economics is at a crossroads: Academics are struggling to redefine the theory of finance and practitioners and regulators to restructure the financial industry. The current financial crisis will have significant impact on how we regulate financial markets and how we manage risk in companies and financial institutions. It will continue to inspire an intense discussion and research agenda over the next decade in academics, in industry, and among financial regulators and a central focus will be the role of frictions in financial markets. Nowhere are these issues more pertinent than in Europe right now.
To take up the challenge presented by this crossroad of financial economics, my research project seeks to contribute to the knowledge of financial frictions and what to do about them. FRICTIONS will explore how financial frictions affect asset prices and the economy, and the implications of frictions for financial risk management, the optimal regulation, and the conduct of monetary policy.
Whereas economists have traditionally focused on the assumption of perfect markets, a growing body of evidence is leading to a widespread recognition that markets are plagued by significant financial frictions. FRICTIONS will model key financial frictions such as leverage constraints, margin requirements, transaction costs, liquidity risk, and short sale constraints. The objective is to develop theories of the origins of these frictions, study how these frictions change over time and across markets, and, importantly, how they affect the required return on assets and the economy.
The project will test these theories using data from global equity, bond, and derivative markets. In particular, the project will measure these frictions empirically and study the empirical effect of frictions on asset returns and economic dynamics. The end result is an empirically-validated model of economic behavior subject to financial frictions that yields qualitative and quantitative insights."
Summary
"Financial economics is at a crossroads: Academics are struggling to redefine the theory of finance and practitioners and regulators to restructure the financial industry. The current financial crisis will have significant impact on how we regulate financial markets and how we manage risk in companies and financial institutions. It will continue to inspire an intense discussion and research agenda over the next decade in academics, in industry, and among financial regulators and a central focus will be the role of frictions in financial markets. Nowhere are these issues more pertinent than in Europe right now.
To take up the challenge presented by this crossroad of financial economics, my research project seeks to contribute to the knowledge of financial frictions and what to do about them. FRICTIONS will explore how financial frictions affect asset prices and the economy, and the implications of frictions for financial risk management, the optimal regulation, and the conduct of monetary policy.
Whereas economists have traditionally focused on the assumption of perfect markets, a growing body of evidence is leading to a widespread recognition that markets are plagued by significant financial frictions. FRICTIONS will model key financial frictions such as leverage constraints, margin requirements, transaction costs, liquidity risk, and short sale constraints. The objective is to develop theories of the origins of these frictions, study how these frictions change over time and across markets, and, importantly, how they affect the required return on assets and the economy.
The project will test these theories using data from global equity, bond, and derivative markets. In particular, the project will measure these frictions empirically and study the empirical effect of frictions on asset returns and economic dynamics. The end result is an empirically-validated model of economic behavior subject to financial frictions that yields qualitative and quantitative insights."
Max ERC Funding
1 307 160 €
Duration
Start date: 2013-01-01, End date: 2017-12-31
Project acronym FunDiT
Project Functional Diversity of T cells
Researcher (PI) Ondrej STEPANEK
Host Institution (HI) USTAV MOLEKULARNI GENETIKY AKADEMIE VED CESKE REPUBLIKY VEREJNA VYZKUMNA INSTITUCE
Call Details Starting Grant (StG), LS6, ERC-2018-STG
Summary T cells have a central role in most adaptive immune responses, including immunity to infection, cancer, and autoimmunity. Increasing evidence shows that even resting steady-state T cells form many different subsets with unique functions. Variable level of self-reactivity and previous antigenic exposure are most likely two major determinants of the T-cell diversity. However, the number, identity, and biological function of steady-state T-cell subsets are still very incompletely understood. Receptors to ligands from TNF and B7 families exhibit variable expression among T-cell subsets and are important regulators of T-cell fate decisions. We hypothesize that pathways triggered by these receptors substantially contribute to the functional diversity of T cells.The FunDiT project uses a set of novel tools to systematically identify steady-state CD8+ T cell subsets and characterize their biological roles. The project has three complementary objectives.
(1) Identification of CD8+ T cell subsets. We will identify subsets based on single cell gene expression profiling. We will determine the role of self and foreign antigens in the formation of these subsets and match corresponding subsets between mice and humans.
(2) Role of particular subsets in the immune response. We will compare antigenic responses of particular subsets using our novel model allowing inducible expression of a defined TCR. The activity of T-cell subsets in three disease models (infection, cancer, autoimmunity) will be characterized.
(3) Characterization of key costimulatory/inhibitory pathways. We will use our novel mass spectrometry-based approach to identify receptors and signaling molecules involved in the signaling by ligands from TNF and B7 families in T cells.
The results will provide understanding of the adaptive immunity in particular disease context and resolve long-standing questions concerning the roles of T-cell diversity in protective immunity and tolerance to healthy tissues and tumors.
Summary
T cells have a central role in most adaptive immune responses, including immunity to infection, cancer, and autoimmunity. Increasing evidence shows that even resting steady-state T cells form many different subsets with unique functions. Variable level of self-reactivity and previous antigenic exposure are most likely two major determinants of the T-cell diversity. However, the number, identity, and biological function of steady-state T-cell subsets are still very incompletely understood. Receptors to ligands from TNF and B7 families exhibit variable expression among T-cell subsets and are important regulators of T-cell fate decisions. We hypothesize that pathways triggered by these receptors substantially contribute to the functional diversity of T cells.The FunDiT project uses a set of novel tools to systematically identify steady-state CD8+ T cell subsets and characterize their biological roles. The project has three complementary objectives.
(1) Identification of CD8+ T cell subsets. We will identify subsets based on single cell gene expression profiling. We will determine the role of self and foreign antigens in the formation of these subsets and match corresponding subsets between mice and humans.
(2) Role of particular subsets in the immune response. We will compare antigenic responses of particular subsets using our novel model allowing inducible expression of a defined TCR. The activity of T-cell subsets in three disease models (infection, cancer, autoimmunity) will be characterized.
(3) Characterization of key costimulatory/inhibitory pathways. We will use our novel mass spectrometry-based approach to identify receptors and signaling molecules involved in the signaling by ligands from TNF and B7 families in T cells.
The results will provide understanding of the adaptive immunity in particular disease context and resolve long-standing questions concerning the roles of T-cell diversity in protective immunity and tolerance to healthy tissues and tumors.
Max ERC Funding
1 725 000 €
Duration
Start date: 2019-01-01, End date: 2023-12-31
Project acronym GADD45&P38SIGNALING
Project Role of the Gadd45 family and p38 MAPK in tumor suppression and autoimmunity
Researcher (PI) Jesús Salvador
Host Institution (HI) AGENCIA ESTATAL CONSEJO SUPERIOR DEINVESTIGACIONES CIENTIFICAS
Call Details Starting Grant (StG), LS3, ERC-2007-StG
Summary Gadd45 family proteins play a critical role in genomic stability, cell cycle regulation proliferation and apoptosis. Gadd45a is activated by the tumor suppressor gene p53, which is mutated in >50% of human tumors. The lack of GADD45a in mice leads to spontaneous development of an autoimmune disease similar to systemic lupus erythematosus. The molecular mechanisms that cause autoimmunity are poorly understood. Recent evidence suggests that p38 activation is involved in autoimmune development and tumor suppression. We found that Gadd45a negatively regulates p38 activity in T cells by preventing phosphorylation on Tyr323. Inhibition of Tyr323p38 phosphorylation is a potential therapeutic target in several types of leukemia and autoimmune diseases, including lupus and rheumatoid arthritis. The main goals of this project are a) to study the in vivo function of the Gadd45 family and p38 in tumor suppression and autoimmunity, and b) to analyze their molecular mechanisms to identify targets for disease treatment. We will dissect the signaling pathways involved in development of autoimmunity and cancer using a multidisciplinary approach that combines mouse genetic, human epigenetic, biochemical, molecular biological and immunological techniques. Our project involves the characterization of murine models deficient in each member of the Gadd45 family (Gadd45a, Gadd45b, Gadd45g), as well as double- and triple-knockout mice, development of a knock-in model for p38a, in vivo and in vitro analysis of T cell activation, proliferation, apoptosis and differentiation, epigenetic studies of potential targets, and finally, validation of these results in autoimmune disease and cancer patients. The results of this project will help identify new therapeutic targets for autoimmune diseases and/or cancer.
Summary
Gadd45 family proteins play a critical role in genomic stability, cell cycle regulation proliferation and apoptosis. Gadd45a is activated by the tumor suppressor gene p53, which is mutated in >50% of human tumors. The lack of GADD45a in mice leads to spontaneous development of an autoimmune disease similar to systemic lupus erythematosus. The molecular mechanisms that cause autoimmunity are poorly understood. Recent evidence suggests that p38 activation is involved in autoimmune development and tumor suppression. We found that Gadd45a negatively regulates p38 activity in T cells by preventing phosphorylation on Tyr323. Inhibition of Tyr323p38 phosphorylation is a potential therapeutic target in several types of leukemia and autoimmune diseases, including lupus and rheumatoid arthritis. The main goals of this project are a) to study the in vivo function of the Gadd45 family and p38 in tumor suppression and autoimmunity, and b) to analyze their molecular mechanisms to identify targets for disease treatment. We will dissect the signaling pathways involved in development of autoimmunity and cancer using a multidisciplinary approach that combines mouse genetic, human epigenetic, biochemical, molecular biological and immunological techniques. Our project involves the characterization of murine models deficient in each member of the Gadd45 family (Gadd45a, Gadd45b, Gadd45g), as well as double- and triple-knockout mice, development of a knock-in model for p38a, in vivo and in vitro analysis of T cell activation, proliferation, apoptosis and differentiation, epigenetic studies of potential targets, and finally, validation of these results in autoimmune disease and cancer patients. The results of this project will help identify new therapeutic targets for autoimmune diseases and/or cancer.
Max ERC Funding
1 755 805 €
Duration
Start date: 2008-09-01, End date: 2014-08-31
Project acronym GENESFORCEMOTION
Project Physical Forces Driving Collective Cell Migration: from Genes to Mechanism
Researcher (PI) Xavier Trepat Guixer
Host Institution (HI) FUNDACIO INSTITUT DE BIOENGINYERIA DE CATALUNYA
Call Details Starting Grant (StG), LS3, ERC-2009-StG
Summary Fundamental biological processes including morphogenesis, tissue repair, and tumour metastasis require collective cell motions, and to drive these motions cells exert traction forces on their surroundings. The mechanisms underlying this basic principle of health and disease have been debated intensively and, using a variety of methods in vivo, in vitro, and in silico, much conflicting evidence has accumulated. This conflicting evidence has been in every case indirect or inferential, however, because within the moving cell group the physical forces themselves have remained inaccessible to direct experimental observation. To fill this gap, this ERC application describes an interdisciplinary project to uncover the physical mechanisms underlying collective cell migration. In Objective 1, I propose to develop technology to map forces that cells within moving groups exert on each other and on their extracellular matrix. In Objective 2, we will use siRNA technology to provide a systematic analysis of the genes that regulate force generation and transmission in a migrating epithelial cell sheet. In Objective 3, we will use this pool of data to establish a constitutive link between genes, forces and collective cell motion. Although these Objectives present major technical and scientific challenges, the feasibility of each is supported by a unique technical know-how and by a productive track record in the field of cell biophysics.
Summary
Fundamental biological processes including morphogenesis, tissue repair, and tumour metastasis require collective cell motions, and to drive these motions cells exert traction forces on their surroundings. The mechanisms underlying this basic principle of health and disease have been debated intensively and, using a variety of methods in vivo, in vitro, and in silico, much conflicting evidence has accumulated. This conflicting evidence has been in every case indirect or inferential, however, because within the moving cell group the physical forces themselves have remained inaccessible to direct experimental observation. To fill this gap, this ERC application describes an interdisciplinary project to uncover the physical mechanisms underlying collective cell migration. In Objective 1, I propose to develop technology to map forces that cells within moving groups exert on each other and on their extracellular matrix. In Objective 2, we will use siRNA technology to provide a systematic analysis of the genes that regulate force generation and transmission in a migrating epithelial cell sheet. In Objective 3, we will use this pool of data to establish a constitutive link between genes, forces and collective cell motion. Although these Objectives present major technical and scientific challenges, the feasibility of each is supported by a unique technical know-how and by a productive track record in the field of cell biophysics.
Max ERC Funding
1 749 745 €
Duration
Start date: 2010-01-01, End date: 2014-12-31