Heterocellular OSM-OSMR signalling drives pancreatic cancer growth and metastasis through functional fibroblast reprogramming
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ABSTRACT:
PROVIDER: PRJNA677956 | ENA |
REPOSITORIES: ENA
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Project description:Pancreatic ductal adenocarcinoma (PDA) is a lethal malignancy characterised by a pathological fibroinflammatory microenvironment. Dichotomous tumour-promoting and -restrictive roles have been ascribed to the tumour microenvironment, however the effects of individual stromal subsets remains incompletely characterised. Here, we describe how heterocellular OSM-OSMR signalling instructs fibroblast reprogramming, tumour growth and metastasis. Macrophage-secreted OSM stimulates inflammatory gene expression in cancer-associated fibroblasts (CAFs), which in turn induce a pro-tumorigenic environment and engage tumour cell survival and migratory signalling pathways. Tumour cells implanted in Osm-deficient (Osm-/-) mice display an epithelial-dominated morphology, reduced tumour growth and did not metastasise. Moreover, the tumour microenvironment of Osm-/- animals exhibit increased abundance of αSMApos myofibroblasts and a shift in myeloid and T cell phenotypes, consistent with a more immunogenic environment. Taken together, these data demonstrate how OSM-OSMR signalling coordinates heterocellular interactions to drive a pro-tumorigenic environment in PDA.
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Project description:Pancreatic ductal adenocarcinoma (PDA) is a lethal malignancy characterised by a pathologicalfibroinflammatorymicroenvironment. Dichotomous tumour-promoting and -restrictive roles have been ascribed to the tumour microenvironment, however thedisparate effect of individual stromal subsets remains incompletely characterised. Here, we describe how heterocellular OSM-OSMR signalling instructsfibroblast reprogramming,tumourgrowth and metastasis.Macrophage-secreted OSM stimulatesinflammatory gene expression in cancer-associated fibroblasts (CAFs), which in turn induce a pro-tumorigenic environment and engage tumour cellsurvival and migratory signalling pathways. Tumour cells implanted in Osm-deficient (Osm-/-) mice display an epithelial-dominated morphology, reduced tumour growth and did notmetastasise. Moreover, the tumour microenvironment of Osm-/-animals exhibit increased abundance of αSMAposmyofibroblasts and a shift in myeloid and T cell phenotypes, consistent with a more immunogenic environment. Taken together, these data demonstrate how OSM-OSMR signalling coordinates heterocellular interactions to drive a pro-tumorigenic environment in PDA.
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Project description:CD34+ cells improve the perfusion and function of ischemic limbs in humans and mice. However, there is no direct evidence of the differentiation potential and functional role of these cells in the ischemic muscle microenvironment. Here, we combined the single-cell RNA sequencing and genetic lineage tracing technology and then provided exact single-cell atlases of normal and ischemic limb tissues in human and mouse, consequently found that bone marrow-derived macrophages with antigen-presenting function migrated to the ischemic site, while resident macrophages underwent apoptosis. The macrophage oncostatin M (OSM) regulatory pathway was specifically turned on by ischemia. Simultaneously, bone marrow CD34+-derived pro-regenerative fibroblasts were recruited to the ischemia niche, where they received macrophage-released OSM, and promoted angiopoietin-like protein (ANGPTL)-associated angiogenesis. These findings provided novel mechanisms on the cellular events and cell–cell communications during tissue ischemia and regeneration, and provided new evidence that CD34+ cells serve as fibroblast progenitors promoting tissue regeneration.
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Project description:The type II Oncostatin M receptor (OSMR) serves as the main binding site for the pleiotropic cytokine OSM. We have previously demonstrated a positive correlation between copy number driven OSMR over-expression and adverse clinical outcome in cervical tumours and have also established enhanced angiogenic, migratory and invasive potential as major consequences of OSMR over-expression using cell-line models of cervical cancer. By analysis of gene expression patterns in cell lines and tumours, this study now systematically defines cohorts of genes that are implicated for the phenotypes observed. Importantly, we have identified 15 OSM induced genes that are involved in at least one of these key functions and are up-regulated in both OSMR over-expressing cell-lines and tumours. These genes can serve as markers of OSM signalling in OSMR over-expressing SCCs and represent suitable targets for functional characterisation. Gene expression of 4 cervical SCC cell lines analysed (2 with and 2 without OSMR overexpression) at 6 different time-points, with 3 replicates at each time-point.
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Project description:The type II Oncostatin M receptor (OSMR) serves as the main binding site for the pleiotropic cytokine OSM. We have previously demonstrated a positive correlation between copy number driven OSMR over-expression and adverse clinical outcome in cervical tumours and have also established enhanced angiogenic, migratory and invasive potential as major consequences of OSMR over-expression using cell-line models of cervical cancer. By analysis of gene expression patterns in cell lines and tumours, this study now systematically defines cohorts of genes that are implicated for the phenotypes observed. Importantly, we have identified 15 OSM induced genes that are involved in at least one of these key functions and are up-regulated in both OSMR over-expressing cell-lines and tumours. These genes can serve as markers of OSM signalling in OSMR over-expressing SCCs and represent suitable targets for functional characterisation.
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Project description:Oncostatin M (OSM) and Leukemia Inhibitory Factor (LIF) signal within cells via the gp130 (Il6st) coreceptor bound either to the LIF receptor (LIFR) or the oncostatin M receptor (OSMR), but whether murine OSM can act through both receptors is controversial. Both LIF and OSM stimulate bone formation, inhibit adipocyte differentiation, and promote osteoclast differentiation, but our earlier work suggested this may depend on the receptor subtype used. This project aimed to identify those gene targets regulated by murine OSM via OSMR and LIFR by using wild type and OSMR null primary osteoblasts. Cells were differentiated to their most mature state (i.e. osteocytes) because the only prior target gene known to be regulated by murine OSM via the LIFR was an osteocyte-specific gene, sclerostin.
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