Project acronym ADIMMUNE
Project Decoding interactions between adipose tissue immune cells, metabolic function, and the intestinal microbiome in obesity
Researcher (PI) Eran Elinav
Host Institution (HI) WEIZMANN INSTITUTE OF SCIENCE
Call Details Consolidator Grant (CoG), LS6, ERC-2018-COG
Summary Obesity and its metabolic co-morbidities have given rise to a rapidly expanding ‘metabolic syndrome’ pandemic affecting
hundreds of millions of individuals worldwide. The integrative genetic and environmental causes of the obesity pandemic
remain elusive. White adipose tissue (WAT)-resident immune cells have recently been highlighted as important factors
contributing to metabolic complications. However, a comprehensive understanding of the regulatory circuits governing their
function and the cell type-specific mechanisms by which they contribute to the development of metabolic syndrome is
lacking. Likewise, the gut microbiome has been suggested as a critical regulator of obesity, but the bacterial species and
metabolites that influence WAT inflammation are entirely unknown.
We propose to use our recently developed high-throughput genomic and gnotobiotic tools, integrated with CRISPR-mediated interrogation of gene function, microbial culturomics, and in-vivo metabolic analysis in newly generated mouse models, in order to achieve a new level of molecular understanding of how WAT immune cells integrate environmental cues into their crosstalk with organismal metabolism, and to explore the microbial contributions to the molecular etiology of WAT inflammation in the pathogenesis of diet-induced obesity. Specifically, we aim to (a) decipher the global regulatory landscape and interaction networks of WAT hematopoietic cells at the single-cell level, (b) identify new mediators of WAT immune cell contributions to metabolic homeostasis, and (c) decode how host-microbiome communication shapes the development of WAT inflammation and obesity.
Unraveling the principles of WAT immune cell regulation and their amenability to change by host-microbiota interactions
may lead to a conceptual leap forward in our understanding of metabolic physiology and disease. Concomitantly, it may
generate a platform for microbiome-based personalized therapy against obesity and its complications.
Summary
Obesity and its metabolic co-morbidities have given rise to a rapidly expanding ‘metabolic syndrome’ pandemic affecting
hundreds of millions of individuals worldwide. The integrative genetic and environmental causes of the obesity pandemic
remain elusive. White adipose tissue (WAT)-resident immune cells have recently been highlighted as important factors
contributing to metabolic complications. However, a comprehensive understanding of the regulatory circuits governing their
function and the cell type-specific mechanisms by which they contribute to the development of metabolic syndrome is
lacking. Likewise, the gut microbiome has been suggested as a critical regulator of obesity, but the bacterial species and
metabolites that influence WAT inflammation are entirely unknown.
We propose to use our recently developed high-throughput genomic and gnotobiotic tools, integrated with CRISPR-mediated interrogation of gene function, microbial culturomics, and in-vivo metabolic analysis in newly generated mouse models, in order to achieve a new level of molecular understanding of how WAT immune cells integrate environmental cues into their crosstalk with organismal metabolism, and to explore the microbial contributions to the molecular etiology of WAT inflammation in the pathogenesis of diet-induced obesity. Specifically, we aim to (a) decipher the global regulatory landscape and interaction networks of WAT hematopoietic cells at the single-cell level, (b) identify new mediators of WAT immune cell contributions to metabolic homeostasis, and (c) decode how host-microbiome communication shapes the development of WAT inflammation and obesity.
Unraveling the principles of WAT immune cell regulation and their amenability to change by host-microbiota interactions
may lead to a conceptual leap forward in our understanding of metabolic physiology and disease. Concomitantly, it may
generate a platform for microbiome-based personalized therapy against obesity and its complications.
Max ERC Funding
2 000 000 €
Duration
Start date: 2019-03-01, End date: 2024-02-29
Project acronym CoPathoPhage
Project Pathogen-phage cooperation during mammalian infection
Researcher (PI) Anat Herskovits
Host Institution (HI) TEL AVIV UNIVERSITY
Call Details Consolidator Grant (CoG), LS6, ERC-2018-COG
Summary Most bacterial pathogens are lysogens, namely carry DNA of active phages within their genome, referred to as prophages. While these prophages have the potential to turn under stress into infective viruses which kill their host bacterium in a matter of minutes, it is unclear how pathogens manage to survive this internal threat under the stresses imposed by their invasion into mammalian cells. In the proposed project, we will study the hypothesis that a complex bacteria-phage cooperative adaptation supports virulence during mammalian infection while preventing inadvertent killing by phages. Several years ago, we uncovered a novel pathogen-phage interaction, in which an infective prophage promotes the virulence of its host, the bacterial pathogen Listeria monocytogenes (Lm), via adaptive behaviour. More recently, we discovered that the prophage, though fully infective, is non-autonomous- completely dependent on regulatory factors derived from inactive prophage remnants that reside in the Lm chromosome. These findings lead us to propose that the intimate cross-regulatory interactions between all phage elements within the genome (infective and remnant), are crucial in promoting bacteria-phage patho-adaptive behaviours in the mammalian niche and thereby bacterial virulence. In the proposed project, we will investigate specific cross-regulatory and cooperative mechanisms of all the phage elements, study the domestication of phage remnant-derived regulatory factors, and examine the hypothesis that they collectively form an auxiliary phage-control system that tempers infective phages. Finally, we will examine the premise that the mammalian niche drives the evolution of temperate phages into patho-adaptive phages, and that phages that lack this adaptation may kill host pathogens during infection. This work is expected to provide novel insights into bacteria-phage coexistence in mammalian environments and to facilitate the development of innovative phage therapy strategies.
Summary
Most bacterial pathogens are lysogens, namely carry DNA of active phages within their genome, referred to as prophages. While these prophages have the potential to turn under stress into infective viruses which kill their host bacterium in a matter of minutes, it is unclear how pathogens manage to survive this internal threat under the stresses imposed by their invasion into mammalian cells. In the proposed project, we will study the hypothesis that a complex bacteria-phage cooperative adaptation supports virulence during mammalian infection while preventing inadvertent killing by phages. Several years ago, we uncovered a novel pathogen-phage interaction, in which an infective prophage promotes the virulence of its host, the bacterial pathogen Listeria monocytogenes (Lm), via adaptive behaviour. More recently, we discovered that the prophage, though fully infective, is non-autonomous- completely dependent on regulatory factors derived from inactive prophage remnants that reside in the Lm chromosome. These findings lead us to propose that the intimate cross-regulatory interactions between all phage elements within the genome (infective and remnant), are crucial in promoting bacteria-phage patho-adaptive behaviours in the mammalian niche and thereby bacterial virulence. In the proposed project, we will investigate specific cross-regulatory and cooperative mechanisms of all the phage elements, study the domestication of phage remnant-derived regulatory factors, and examine the hypothesis that they collectively form an auxiliary phage-control system that tempers infective phages. Finally, we will examine the premise that the mammalian niche drives the evolution of temperate phages into patho-adaptive phages, and that phages that lack this adaptation may kill host pathogens during infection. This work is expected to provide novel insights into bacteria-phage coexistence in mammalian environments and to facilitate the development of innovative phage therapy strategies.
Max ERC Funding
2 200 000 €
Duration
Start date: 2019-10-01, End date: 2024-09-30
Project acronym DDRMac
Project DNA Damage Response-instructed Macrophage Differentiation in Granulomatous Diseases
Researcher (PI) Antigoni TRIANTAFYLLOPOULOU
Host Institution (HI) CHARITE - UNIVERSITAETSMEDIZIN BERLIN
Call Details Starting Grant (StG), LS6, ERC-2018-STG
Summary Macrophage differentiation programs are critical for the outcome of immunity against infection, chronic inflammatory diseases and cancer. How diverse inflammatory signals are translated to macrophage programs in the large range of human pathologies is largely unexplored. In the last years we focused on macrophage differentiation in granulomatous diseases. These affect millions worldwide, including young adults and children and tend to run a chronic course, with a high socioeconomic burden. Their common hallmark is the formation of granulomas, macrophage-driven structures of organized inflammation that replace healthy tissue. We revealed that macrophage precursors in granulomas experience a replication block and trigger the DNA Damage Response (DDR), a fundamental cellular process activated in response to genotoxic stress. This leads to the formation of multinucleated macrophages with tissue-remodelling signatures (Herrtwich, Cell 2016). Our work unravelled an intriguing link between genotoxic stress and granuloma-specific macrophage programs. The molecular pathways regulating DDR-driven macrophage differentiation and their role in chronic inflammatory pathologies remain however a black box. We hypothesize that the DDR promotes macrophage reprogramming to inflammation-maintaining modules. Such programs operate in granulomatous diseases and in chronic arthritis. Using state-of-the art genetic models, human tissues and an array of techniques crossing the fields of immunology, cell biology and cancer biology, our goal is to unravel the macrophage-specific response to genotoxic stress as an essential regulator of chronic inflammation-induced pathologies. The anticipated results will provide the scientific community with new knowledge on the role of genotoxic stress in immune dysregulation and will carry tremendous implications for the therapeutic targeting of macrophages in the context of chronic inflammatory diseases and cancer.
Summary
Macrophage differentiation programs are critical for the outcome of immunity against infection, chronic inflammatory diseases and cancer. How diverse inflammatory signals are translated to macrophage programs in the large range of human pathologies is largely unexplored. In the last years we focused on macrophage differentiation in granulomatous diseases. These affect millions worldwide, including young adults and children and tend to run a chronic course, with a high socioeconomic burden. Their common hallmark is the formation of granulomas, macrophage-driven structures of organized inflammation that replace healthy tissue. We revealed that macrophage precursors in granulomas experience a replication block and trigger the DNA Damage Response (DDR), a fundamental cellular process activated in response to genotoxic stress. This leads to the formation of multinucleated macrophages with tissue-remodelling signatures (Herrtwich, Cell 2016). Our work unravelled an intriguing link between genotoxic stress and granuloma-specific macrophage programs. The molecular pathways regulating DDR-driven macrophage differentiation and their role in chronic inflammatory pathologies remain however a black box. We hypothesize that the DDR promotes macrophage reprogramming to inflammation-maintaining modules. Such programs operate in granulomatous diseases and in chronic arthritis. Using state-of-the art genetic models, human tissues and an array of techniques crossing the fields of immunology, cell biology and cancer biology, our goal is to unravel the macrophage-specific response to genotoxic stress as an essential regulator of chronic inflammation-induced pathologies. The anticipated results will provide the scientific community with new knowledge on the role of genotoxic stress in immune dysregulation and will carry tremendous implications for the therapeutic targeting of macrophages in the context of chronic inflammatory diseases and cancer.
Max ERC Funding
1 500 000 €
Duration
Start date: 2019-04-01, End date: 2024-03-31
Project acronym ENTRI
Project Enteric-nervous-system-mediated regulation of intestinal inflammation
Researcher (PI) Christoph Klose
Host Institution (HI) CHARITE - UNIVERSITAETSMEDIZIN BERLIN
Call Details Starting Grant (StG), LS6, ERC-2018-STG
Summary Environmental and internal stimuli are constantly sensed by the body’s two large sensory units, the nervous system and the immune system. Integration of these sensory signals and translation into effector responses are essential for maintaining body homeostasis. While some of the intrinsic pathways of the immune or nervous system have been investigated, how the two sensory interfaces coordinate their responses remains elusive. We have recently investigated neuro-immune interaction at the mucosa of the intestine, which is densely innervated by the enteric nervous system (ENS). Our research has exposed a previously unrecognized pathway used by enteric neurons to shape type 2 immunity at mucosal barriers. Cholinergic enteric neurons produce the neuropeptide Neuromedin U (NMU) to elicit potent activation of type 2 innate lymphoid cells (ILC2s) via Neuromedin U receptor 1, selectively expressed by ILC2s. Interestingly, NMU stimulated protective immunity against the parasite Nippostrongylus brasiliensis but also triggered allergic lung inflammation. Therefore, the NMU-NMUR1 axis provides an excellent opportunity to study how neurons and immune cells interact to regulate immune responses and maintain body homeostasis. We propose to generate and use elegant genetic tools, which will allow us to systematically investigate the consequences of neuro-immune crosstalk at mucosal surfaces in various disease models. These tools will enable us to selectively measure and interfere with neuronal and ILC2 gene expression and function, thereby leading to an unprecedented understanding of how the components of neuro-immune crosstalk contribute to parasite immunity or allergic disease development. Furthermore, we will progress into translational aspects of NMU-regulated immune activation for human immunology. Therefore, our research has the potential to develop basic concepts of mucosal immune regulation and such discoveries could also be harnessed for therapeutic intervention.
Summary
Environmental and internal stimuli are constantly sensed by the body’s two large sensory units, the nervous system and the immune system. Integration of these sensory signals and translation into effector responses are essential for maintaining body homeostasis. While some of the intrinsic pathways of the immune or nervous system have been investigated, how the two sensory interfaces coordinate their responses remains elusive. We have recently investigated neuro-immune interaction at the mucosa of the intestine, which is densely innervated by the enteric nervous system (ENS). Our research has exposed a previously unrecognized pathway used by enteric neurons to shape type 2 immunity at mucosal barriers. Cholinergic enteric neurons produce the neuropeptide Neuromedin U (NMU) to elicit potent activation of type 2 innate lymphoid cells (ILC2s) via Neuromedin U receptor 1, selectively expressed by ILC2s. Interestingly, NMU stimulated protective immunity against the parasite Nippostrongylus brasiliensis but also triggered allergic lung inflammation. Therefore, the NMU-NMUR1 axis provides an excellent opportunity to study how neurons and immune cells interact to regulate immune responses and maintain body homeostasis. We propose to generate and use elegant genetic tools, which will allow us to systematically investigate the consequences of neuro-immune crosstalk at mucosal surfaces in various disease models. These tools will enable us to selectively measure and interfere with neuronal and ILC2 gene expression and function, thereby leading to an unprecedented understanding of how the components of neuro-immune crosstalk contribute to parasite immunity or allergic disease development. Furthermore, we will progress into translational aspects of NMU-regulated immune activation for human immunology. Therefore, our research has the potential to develop basic concepts of mucosal immune regulation and such discoveries could also be harnessed for therapeutic intervention.
Max ERC Funding
1 499 638 €
Duration
Start date: 2019-07-01, End date: 2024-06-30
Project acronym EpiTune
Project Epigenetic fine-tuning of T cells for improved adoptive cell therapy
Researcher (PI) Julia Polansky-Biskup
Host Institution (HI) CHARITE - UNIVERSITAETSMEDIZIN BERLIN
Call Details Starting Grant (StG), LS6, ERC-2018-STG
Summary "Adoptive T cell therapy is a promising approach in various clinical settings, from target-specific immune reconstitution fighting cancer and chronic infections to combating undesired immune reactivity during auto-immunity and after organ transplantation.
However, its clinical application is currently hampered by: 1) the acquisition of senescence during the required in vitro expansion phase of T cells which limits their survival and fitness after infusion into the patient, and 2) the functional plasticity of T cells, which is sensitive to the inflammatory environment they encounter after transfusion and which might result in a functional switch from the desired effect (e.g. immunosuppressive) to the opposite one (pro-inflammatory).
I want to tackle these obstacles from a new molecular angle, utilizing the profound impact of epigenetic mechanisms on the senescence process as well as on the functional imprinting of T lymphocytes. Epigenetic players such as DNA methylation essentially contribute to T cell differentiation and harbor the unique prospect to imprint a stable developmental and functional state in the genomic structure of a cell, as we could recently show in our basic immune-epigenetic studies. Therefore, I here propose to equip T lymphocytes with the required properties for their successful and safe therapeutic application, including their functional fine-tuning according to the clinical need by directed modifications of the epigenome
('Epi-tuning').
To reach these goals I want: 1) to reveal strategies for the directed manipulation of the epigenetically-driven mechanism of cellular senescence and 2) to apply state-of-the-art CRISPR/Cas9-mediated epigenetic editing approaches for the imprinting of a desired functional state of therapeutic T cell products. These innovative epigenetic ""one-shot"" manipulations during the in vitro expansion phase should advance T cell therapy towards improved efficiency, stability as well as safety."
Summary
"Adoptive T cell therapy is a promising approach in various clinical settings, from target-specific immune reconstitution fighting cancer and chronic infections to combating undesired immune reactivity during auto-immunity and after organ transplantation.
However, its clinical application is currently hampered by: 1) the acquisition of senescence during the required in vitro expansion phase of T cells which limits their survival and fitness after infusion into the patient, and 2) the functional plasticity of T cells, which is sensitive to the inflammatory environment they encounter after transfusion and which might result in a functional switch from the desired effect (e.g. immunosuppressive) to the opposite one (pro-inflammatory).
I want to tackle these obstacles from a new molecular angle, utilizing the profound impact of epigenetic mechanisms on the senescence process as well as on the functional imprinting of T lymphocytes. Epigenetic players such as DNA methylation essentially contribute to T cell differentiation and harbor the unique prospect to imprint a stable developmental and functional state in the genomic structure of a cell, as we could recently show in our basic immune-epigenetic studies. Therefore, I here propose to equip T lymphocytes with the required properties for their successful and safe therapeutic application, including their functional fine-tuning according to the clinical need by directed modifications of the epigenome
('Epi-tuning').
To reach these goals I want: 1) to reveal strategies for the directed manipulation of the epigenetically-driven mechanism of cellular senescence and 2) to apply state-of-the-art CRISPR/Cas9-mediated epigenetic editing approaches for the imprinting of a desired functional state of therapeutic T cell products. These innovative epigenetic ""one-shot"" manipulations during the in vitro expansion phase should advance T cell therapy towards improved efficiency, stability as well as safety."
Max ERC Funding
1 489 725 €
Duration
Start date: 2019-01-01, End date: 2023-12-31
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 iDysChart
Project Charting key molecules and mechanisms of human immune Dysregulation
Researcher (PI) Ahmet Kaan BOZTUG
Host Institution (HI) LUDWIG BOLTZMANN GESELLSCHAFT GMBH
Call Details Consolidator Grant (CoG), LS6, ERC-2018-COG
Summary The central challenge for the immune system is to efficiently recognize and neutralize foreign antigen while protecting self. If the latter fails, autoimmunity and/or autoinflammation may occur, as observed in many human diseases. Though several human genes involved in the process have been identified we still lack: i) a comprehensive appreciation of all contributing molecular pathways, ii) an understanding of the interplay and epistatic relationships among the various elements and iii) a satisfactory strategy to counteract dysregulation based on an understanding of the regulatory logic.
I hypothesize that there is only a finite number of pathways involved and that it should be possible to mount a synergistic strategy to create a first chart of the entire “territory”. Key to this endeavor is the identification of sufficient elements by mapping immune dysregulation genes to “anchor” the chart onto signposts of which the human pathophysiological relevance is certain. From these signposts, contextualization and integration is achieved by interaction proteomics and network informatics mining the existing data universe, validated through biochemical and imaging tools to power an established set of immune assays. While it may be preposterous to claim feasibility with one ERC grant, I propose that once such a chart exists, even at initial low resolution, it can help reconcile disconnected observations and coalesce future work while being immensely improved in accuracy and mechanistic understanding by the entire community. iDysChart will work towards these goals by 1) identifying novel monogenic causes of autoimmune/autoinflammatory diseases, enabling elucidation of fundamental mechanisms, 2) creating a network-level understanding of molecular pathways of immune dysregulation and 3) employing chemical and genetic screens to complement human disease gene discovery in predicting the core human immune dysregulome and investigating potential avenues for therapeutic modulation.
Summary
The central challenge for the immune system is to efficiently recognize and neutralize foreign antigen while protecting self. If the latter fails, autoimmunity and/or autoinflammation may occur, as observed in many human diseases. Though several human genes involved in the process have been identified we still lack: i) a comprehensive appreciation of all contributing molecular pathways, ii) an understanding of the interplay and epistatic relationships among the various elements and iii) a satisfactory strategy to counteract dysregulation based on an understanding of the regulatory logic.
I hypothesize that there is only a finite number of pathways involved and that it should be possible to mount a synergistic strategy to create a first chart of the entire “territory”. Key to this endeavor is the identification of sufficient elements by mapping immune dysregulation genes to “anchor” the chart onto signposts of which the human pathophysiological relevance is certain. From these signposts, contextualization and integration is achieved by interaction proteomics and network informatics mining the existing data universe, validated through biochemical and imaging tools to power an established set of immune assays. While it may be preposterous to claim feasibility with one ERC grant, I propose that once such a chart exists, even at initial low resolution, it can help reconcile disconnected observations and coalesce future work while being immensely improved in accuracy and mechanistic understanding by the entire community. iDysChart will work towards these goals by 1) identifying novel monogenic causes of autoimmune/autoinflammatory diseases, enabling elucidation of fundamental mechanisms, 2) creating a network-level understanding of molecular pathways of immune dysregulation and 3) employing chemical and genetic screens to complement human disease gene discovery in predicting the core human immune dysregulome and investigating potential avenues for therapeutic modulation.
Max ERC Funding
1 999 263 €
Duration
Start date: 2019-06-01, End date: 2024-05-31
Project acronym IM-ID
Project Defining the intrinsic transcriptional programs and the microenvironmental signals tailoring lung Interstitial Macrophage IDentity
Researcher (PI) Thomas MARICHAL
Host Institution (HI) UNIVERSITE DE LIEGE
Call Details Starting Grant (StG), LS6, ERC-2018-STG
Summary The mechanisms underlying lung homeostasis are of fundamental biological importance and have critical implications for the prevention of immune-mediated diseases such as asthma. We have demonstrated that lung Interstitial Macrophages (IM) exhibit a tolerogenic profile and are able to prevent and limit the development of aberrant immune responses against allergens, thus underscoring their role as crucial regulators of lung homeostasis. In addition, we have shown that IM could expand from monocyte precursors upon host exposure to bacterial unmethylated CpG-DNA, resulting in robust protection against allergic asthma. To date, however, IM have only been characterized as a bulk population in functional studies, and little is known about the tissue-instructive signals, specific transcription factors and differentiation programs which contribute to determining their identity (ID) and function, as proposed by the macrophage niche model. We have developed an innovative transgenic tool to selectively target IM which, in combination with high dimensional single cell technologies, will allow us to (1) define the precise ID of IM, i.e. their spatial organization, heterogeneity, molecular signature and the specific TF governing their differentiation and function; (2) investigate how IM ID is imprinted by the local niche to sustain lung homeostasis. Specifically, we aim to identify the epithelial cell-derived chemo-attractive signals controlling IM precursor recruitment and to elucidate the contribution of the lung cholinergic nervous system to IM ID and lung homeostasis. This research will increase our understanding of the basic mechanisms underlying the fine-tuning of tolerogenic IM and will thus provide robust foundations for novel IM-targeted approaches promoting health and preventing airway diseases in which IM (dys)functions have been implicated.
Summary
The mechanisms underlying lung homeostasis are of fundamental biological importance and have critical implications for the prevention of immune-mediated diseases such as asthma. We have demonstrated that lung Interstitial Macrophages (IM) exhibit a tolerogenic profile and are able to prevent and limit the development of aberrant immune responses against allergens, thus underscoring their role as crucial regulators of lung homeostasis. In addition, we have shown that IM could expand from monocyte precursors upon host exposure to bacterial unmethylated CpG-DNA, resulting in robust protection against allergic asthma. To date, however, IM have only been characterized as a bulk population in functional studies, and little is known about the tissue-instructive signals, specific transcription factors and differentiation programs which contribute to determining their identity (ID) and function, as proposed by the macrophage niche model. We have developed an innovative transgenic tool to selectively target IM which, in combination with high dimensional single cell technologies, will allow us to (1) define the precise ID of IM, i.e. their spatial organization, heterogeneity, molecular signature and the specific TF governing their differentiation and function; (2) investigate how IM ID is imprinted by the local niche to sustain lung homeostasis. Specifically, we aim to identify the epithelial cell-derived chemo-attractive signals controlling IM precursor recruitment and to elucidate the contribution of the lung cholinergic nervous system to IM ID and lung homeostasis. This research will increase our understanding of the basic mechanisms underlying the fine-tuning of tolerogenic IM and will thus provide robust foundations for novel IM-targeted approaches promoting health and preventing airway diseases in which IM (dys)functions have been implicated.
Max ERC Funding
1 500 000 €
Duration
Start date: 2019-01-01, End date: 2023-12-31
Project acronym ImAgine
Project Exploring the link between innate Immunity and cellular Aging
Researcher (PI) Andrea ABLASSER
Host Institution (HI) ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE
Call Details Starting Grant (StG), LS6, ERC-2018-STG
Summary The innate immune system has evolved signalling receptors, which detect various stresses including microbial infection but also signals emanating from non-infectious cellular damage. Upon activation, these signalling receptors can trigger a variety of distinct effector responses collectively aimed towards maintaining the integrity of the host. The recognition of cytosolic DNA through the cGAS-STING pathway is a fundamental mechanism through which pathogens and cellular stress evoke an inflammatory response. Recently, we discovered a new role of the cGAS-STING pathway in promoting cellular senescence, a critical stress response program that is emerging as a key driver of aging. On the basis of this finding, the overarching gaol of ImAgine is to further explore the molecular links that exist between the mechanisms of innate immune signalling and those underlying aging processes. Specifically, we will address whether the cGAS-STING pathway acts as a contributor to age-associated phenotypes and we will interrogate mitotic perturbations as a physiological source of age-associated damage that activates the innate DNA sensing machinery. Another intriguing possibility emerging from our work is that cellular senescence is relevant for the host response against pathogens. Utilising an array of genetic and pharmacological tools, we will challenge this idea and molecularly decipher the role of senescent cells in physiological models of acute and chronic infection. A detailed picture of the interplay between innate immune pathways and cellular ageing will not only be a critical step towards a global understanding of fundamental host response mechanisms, but may also provide new concepts for the treatment of diseases that are associated with infectious diseases or ageing.
Summary
The innate immune system has evolved signalling receptors, which detect various stresses including microbial infection but also signals emanating from non-infectious cellular damage. Upon activation, these signalling receptors can trigger a variety of distinct effector responses collectively aimed towards maintaining the integrity of the host. The recognition of cytosolic DNA through the cGAS-STING pathway is a fundamental mechanism through which pathogens and cellular stress evoke an inflammatory response. Recently, we discovered a new role of the cGAS-STING pathway in promoting cellular senescence, a critical stress response program that is emerging as a key driver of aging. On the basis of this finding, the overarching gaol of ImAgine is to further explore the molecular links that exist between the mechanisms of innate immune signalling and those underlying aging processes. Specifically, we will address whether the cGAS-STING pathway acts as a contributor to age-associated phenotypes and we will interrogate mitotic perturbations as a physiological source of age-associated damage that activates the innate DNA sensing machinery. Another intriguing possibility emerging from our work is that cellular senescence is relevant for the host response against pathogens. Utilising an array of genetic and pharmacological tools, we will challenge this idea and molecularly decipher the role of senescent cells in physiological models of acute and chronic infection. A detailed picture of the interplay between innate immune pathways and cellular ageing will not only be a critical step towards a global understanding of fundamental host response mechanisms, but may also provide new concepts for the treatment of diseases that are associated with infectious diseases or ageing.
Max ERC Funding
1 489 520 €
Duration
Start date: 2019-01-01, End date: 2023-12-31
Project acronym ImmUne
Project Towards identification of the unifying principles of vertebrate adaptive immunity
Researcher (PI) Thomas BOEHM
Host Institution (HI) MAX-PLANCK-GESELLSCHAFT ZUR FORDERUNG DER WISSENSCHAFTEN EV
Call Details Advanced Grant (AdG), LS6, ERC-2018-ADG
Summary About 500 million years ago, the two sister groups of vertebrates independently evolved alternative forms of adaptive immunity, representing a striking example of convergent evolution. Whereas the components and functions of the immune system in jawed vertebrates (ranging from sharks to humans) are well characterized, much remains to be learned about adaptive immunity in jawless vertebrates (lampreys and hagfishes). Up to now, progress in understanding immunity in jawless fishes was hampered by their complex life-cycle, long generation time, and the difficulty of raising fish in the laboratory for extended periods, particularly after in vitro fertilization. Based on our recent methodological advances in aquatic husbandry and successful CRISPR/Cas9-mediated genetic modification, we propose to conduct a large-scale analysis of cellular immunity in lampreys laying the foundations for the identification of the unifying principles of vertebrate immunity. Our experiments will address the development and characteristics of different T cell subsets, the molecular basis of antigen receptor assembly, and the function of the two principal T cell lineages during the immune response. We will also examine the structure and function of the stromal microenvironment in the lamprey thymus equivalent, which is considered to be the site of T cell development. A particular focus will be on the functional analysis of a recently discovered MHC-like locus in the context of T cell development, and in the essential self/nonself discrimination mechanism(s) at play during the immune response. We expect that the identification of common design principles of adaptive immunity in vertebrates will provide us with an unprecedented view on immune functions in humans, potentially guiding the development of novel strategies for the treatment of failing immunity in patients with immunodeficiency and/or autoimmunity.
Summary
About 500 million years ago, the two sister groups of vertebrates independently evolved alternative forms of adaptive immunity, representing a striking example of convergent evolution. Whereas the components and functions of the immune system in jawed vertebrates (ranging from sharks to humans) are well characterized, much remains to be learned about adaptive immunity in jawless vertebrates (lampreys and hagfishes). Up to now, progress in understanding immunity in jawless fishes was hampered by their complex life-cycle, long generation time, and the difficulty of raising fish in the laboratory for extended periods, particularly after in vitro fertilization. Based on our recent methodological advances in aquatic husbandry and successful CRISPR/Cas9-mediated genetic modification, we propose to conduct a large-scale analysis of cellular immunity in lampreys laying the foundations for the identification of the unifying principles of vertebrate immunity. Our experiments will address the development and characteristics of different T cell subsets, the molecular basis of antigen receptor assembly, and the function of the two principal T cell lineages during the immune response. We will also examine the structure and function of the stromal microenvironment in the lamprey thymus equivalent, which is considered to be the site of T cell development. A particular focus will be on the functional analysis of a recently discovered MHC-like locus in the context of T cell development, and in the essential self/nonself discrimination mechanism(s) at play during the immune response. We expect that the identification of common design principles of adaptive immunity in vertebrates will provide us with an unprecedented view on immune functions in humans, potentially guiding the development of novel strategies for the treatment of failing immunity in patients with immunodeficiency and/or autoimmunity.
Max ERC Funding
2 498 813 €
Duration
Start date: 2019-06-01, End date: 2024-05-31
