Inactivated M. tuberculosis and M.tuberculosis Infection remodels the macrophage response
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA601129 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR10883816.fastq.gz | Fastqsanger.gz | |||
| SRR10883817.fastq.gz | Fastqsanger.gz | |||
| SRR10883818.fastq.gz | Fastqsanger.gz | |||
| SRR10883819.fastq.gz | Fastqsanger.gz | |||
| SRR10883820.fastq.gz | Fastqsanger.gz |
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Project description:Background: Tuberculosis (TB) remains a major public health problem, especially in developing countries, with 1.5 million deaths annually worldwide. Macrophages (Mφs) are central to TB pathogenesis. Mφs play a key role in the outcome of the infection. More importantly, Mφs are the primary cell target of MTB, which has developed different strategies to multiply inside the Mφ phagosome. Here we aim to compare the transcriptome of Mycobacterium tuberculosis (MTB)-infected Mφs with that of cells stimulated with heat-killed MTB. Results: Here, we used live and heat-inactivated MTB to examine the impact of infection on the human macrophage response. Gene expression profiling has revealed about 3,259 genes differentially expressed in macrophages incubated with heat-inactivated MTB and 4,179 genes differentially expressed with live MTB. We found that the response to live and heat-inactivated MTB was strongly correlated (r>0.78). Conclusions: Our results show that macrophages respond in a similar manner to live and heat-inactivated MTB. We also identified some genes differentially expressed only in one condition.
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Project description:The emergence of multidrug resistant (MDR) Mycobacterium tuberculosis (Mtb) strains, resistant to the frontline anti-tubercular drugs rifampicin and isoniazid, forces treatment with less effective and toxic second-line drugs and stands to derail TB control efforts. However, the immune response to MDR Mtb infection remains poorly understood. Here, we determined the RNA transcriptional profile of in vitro generated macrophages to infection with either drug susceptible Mtb HN878 or MDR Mtb W_7642 infection.
2018-12-26 | GSE115495 | GEO
Project description:Tuberculosis, caused by M.tuberculosis (Mtb), remains an enduring global health challenge, especially given the limited efficacy of current therapeutic interventions. Much of existing research has focused on immune failure as a driver of tuberculosis. However, the crucial role of host macrophage biology in controlling the disease remains underexplored. While we have gained deeper insights into how alveolar macrophages (AMs) interact with Mtb, the precise AM subsets that mediate protection and potentially prevent tuberculosis progression have yet to be identified. In this study, by integrating the use of weighted gene correlation network analysis (WGCNA) modules with our multi-modal scRNA-seq protocol, we were able to evaluate the functional roles of diverse macrophage subpopulations across different infection timepoints, allowing us to delineate the dynamic landscape of controller and permissive AM populations throughout the infection timeline. Our analyses during specific post-Mtb challenge intervals revealed macrophage populations transitioning between distinct anti- and pro-inflammatory states. Notably, CD38- AMs showed a muted response to early Mtb infection. As infection progressed, we observed a phenotypic shift in AMs, with CD38+ monocyte-derived AMs (moAMs) and a subset of tissue-resident AMs (TR-AMs) emerging as significant controllers of bacterial growth. Interestingly, scATAC-seq analysis of naïve lungs demonstrated that CD38+ TR-AMs possessed a distinct chromatin signature prior to infection, indicative of epigenetic priming, and predisposed them to a pro-inflammatory response. BCG intranasal immunization increased the numbers of CD38+ macrophages, substantially enhancing their capability to restrict Mtb growth. Collectively, our findings emphasize the pivotal, dynamic roles of different macrophage subsets in TB infection and reveal rational pathways for the development of improved vaccines and immunotherapeutic strategies, with implications for the broader field of infectious diseases.
2023-10-31 | GSE245950 | GEO
Project description:Tuberculosis, caused by M.tuberculosis (Mtb), remains an enduring global health challenge, especially given the limited efficacy of current therapeutic interventions. Much of existing research has focused on immune failure as a driver of tuberculosis. However, the crucial role of host macrophage biology in controlling the disease remains underexplored. While we have gained deeper insights into how alveolar macrophages (AMs) interact with Mtb, the precise AM subsets that mediate protection and potentially prevent tuberculosis progression have yet to be identified. In this study, by integrating the use of weighted gene correlation network analysis (WGCNA) modules with our multi-modal scRNA-seq protocol, we were able to evaluate the functional roles of diverse macrophage subpopulations across different infection timepoints, allowing us to delineate the dynamic landscape of controller and permissive AM populations throughout the infection timeline. Our analyses during specific post-Mtb challenge intervals revealed macrophage populations transitioning between distinct anti- and pro-inflammatory states. Notably, CD38- AMs showed a muted response to early Mtb infection. As infection progressed, we observed a phenotypic shift in AMs, with CD38+ monocyte-derived AMs (moAMs) and a subset of tissue-resident AMs (TR-AMs) emerging as significant controllers of bacterial growth. Interestingly, scATAC-seq analysis of naïve lungs demonstrated that CD38+ TR-AMs possessed a distinct chromatin signature prior to infection, indicative of epigenetic priming, and predisposed them to a pro-inflammatory response. BCG intranasal immunization increased the numbers of CD38+ macrophages, substantially enhancing their capability to restrict Mtb growth. Collectively, our findings emphasize the pivotal, dynamic roles of different macrophage subsets in TB infection and reveal rational pathways for the development of improved vaccines and immunotherapeutic strategies, with implications for the broader field of infectious diseases.
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Project description:Tri-mannose grafting of chitosan nanocarriers remodels the macrophage response to bacterial infection
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Project description:Background: Infectious diseases are still a leading cause of death and, with the emergence of drug resistance, pose a great threat to human health. New drugs and strategies are thus urgently needed to improve treatment efficacy and limit drug-associated side effects. Nanotechnology-based drug delivery systems are promising approaches, offering hope in the fight against drug resistant bacteria. However, how nanocarriers influence the response of innate immune cells to bacterial infection is mostly unknown. Results: Here, we used Mycobacterium tuberculosis as a model of bacterial infection to examine the impact of mannose functionalization of chitosan nanocarriers (CS-NCs) on the human macrophage response. Both ungrafted and grafted CS-NCs were similarly internalized by macrophages, via an actin cytoskeleton-dependent process. Although tri-mannose ligands did not modify the capacity of CS-NCs to escape lysosomal degradation, they profoundly remodeled the response of M. tuberculosis-infected macrophages. mRNA sequencing showed nearly 900 genes to be differentially expressed due to tri-mannose grafting. Unexpectedly, the set of modulated genes was enriched for pathways involved in cell metabolism, particularly oxidative phosphorylation and sugar metabolism. Conclusions: The ability to modulate cell metabolism by grafting ligands at the surface of nanoparticles may thus be a promising strategy to reprogram immune cells and improve the efficacy of encapsulated drugs.
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