Activation and functions of Col6a1+ fibroblasts in colitis-associated canceer
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA1036209 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR26682782.fastq.gz | Fastqsanger.gz | |||
| SRR26682783.fastq.gz | Fastqsanger.gz | |||
| SRR26682784.fastq.gz | Fastqsanger.gz | |||
| SRR26682785.fastq.gz | Fastqsanger.gz | |||
| SRR26682786.fastq.gz | Fastqsanger.gz |
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Project description:This study shows that Col6a1cre+ cells constitute a subpopulation of cancer-associated fibroblasts in colitis-associated cancer that partly maintains its homeostatic features, while its activation is characterized by the acquisition of a distinct proangiogenic signature, which could be associated with their initial perivascular location.
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Project description:Cancer-associated fibroblasts (CAFs) comprise a group of heterogeneous subpopulations with distinct identities indicative of their diverse origins, activation patterns, and pro-tumorigenic functions. CAFs originate mainly from resident fibroblasts, which are activated upon different stimuli, including growth factors and inflammatory mediators, but the extent to which they also maintain some of their homeostatic properties, at least at the earlier stages of carcinogenesis, is not clear. In response to cytokines, such as interleukin 1 (IL-1) and tumor necrosis factor (TNF), as well as microbial products, CAFs acquire an immunoregulatory phenotype, but its specificity and pathophysiological significance in individual CAF subsets is yet to be determined. In this study, we analyzed the properties of Col6a1-positive fibroblasts in colitis-associated cancer. We found that Col6a1+ cells partly maintain their homeostatic features during adenoma development, while their activation is characterized by the acquisition of a distinct proangiogenic signature associated with their initial perivascular location. In vitro and in vivo experiments showed that Col6a1+ cells respond to innate immune stimuli and exert pro-tumorigenic functions. However, Col6a1+-specific inhibition of TNF receptor 1 (TNFR1) or IL-1 receptor (IL-1R) signaling does not significantly affect tumorigenesis, suggesting that activation of other subsets acts in a compensatory way or that multiple immune stimuli are necessary to drive the proinflammatory activation of this subset. In conclusion, our results show that adenoma-associated CAF subsets can partly maintain the properties of homeostatic fibroblasts while they become activated to support tumor growth through distinct and compensatory mechanisms.
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Project description:Collagen 6 (COL6) is known for its role in a spectrum of congenital muscular dystrophies, which are often accompanied by respiratory dysfunction. However, little is known regarding the function of COL6 in the lung. We confirmed the presence of COL6 throughout the basement membrane region of mouse lung tissue. We studied lung structure and organization in a previously described Col6a1-/- mouse, which do not produce detectable COL6 in the lung. The Col6a1-/- mouse displayed multiple histopathological alveolar and airway abnormalities. The airspaces of Col6a1-/- lungs appeared simplified, with larger (29%, p<0.01) and fewer (31%, p<0.001) alveoli. These airspace abnormalities included a reduction in IsolectinB4+ alveolar capillaries and Sftpc+ ATII cells. Alterations in lung function consistent with these histopathological changes were evident. Col6a1-/- mice also displayed multiple airway changes including increased branching (59%, p<0.001), increased mucosal thickness (34%, p<0.001) and increased epithelial cell density (13%, p<0.001). Comprehensive transcriptome analysis revealed loss of COL6 is associated with reductions in integrin-paxillin-PI3K signaling in vivo. In vitro, COL6 promoted steady-state phospho-paxillin levels and reduced cell density (16-28%, p<0.05) at confluence. Inhibition of PI3K, or its downstream effectors, resulted in increased cell density to a level similar to that seen on matrices lacking COL6.
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Project description:Synovial fibroblasts critically contribute to the pathogenesis of rheumatoid arthritis (RA) by acquiring either a pro-inflammatory or tissue-destructive phenotype. To explore the molecular mechanisms underlying the tissue-destructive fibroblast phenotype in arthritis, we performed bulk RNA-sequencing analysis on the synovial fibroblasts which were isolated from Col6a1-Cre-Ets1-flox/flox (Ets1ΔFib) and Ets1-flox/flox (Ets1flox) mice.
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Project description:Ulcerative colitis (UC) develops through a complicated interaction between the host and microbiota. Intestinal fibroblasts are suggested to play crucial roles in the pathogenesis of UC. However, the influences of the host-microbiota interaction on the pathophysiology of intestinal fibroblasts remain poorly understood. Here, we reveal that OTUD3 suppresses pathologic activation of fibroblasts exposed to microbial cyclic GMP-AMP (3’3’-cGAMP) by deubiquitinating stimulator of interferon genes (STING) in the colon. Sting deficiency ameliorated dextran sodium sulfate-induced colitis in Otud3-/- mice. In addition, mice harboring an UC risk missense variant in the Otud3 gene showed pathological features of UC in the colon after transplantation of a fecal microbiome with the potential to produce excessive cGAMP from UC patients. Collectively, these results demonstrate the critical role of OTUD3 in the maintenance of intestinal homeostasis and highlight one mechanism of the interaction between the host (OTUD3 in fibroblasts) and microbiota (STING agonist) in UC development.
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Project description:Ulcerative colitis (UC) develops through a complicated interaction between the host and microbiota. Intestinal fibroblasts are suggested to play crucial roles in the pathogenesis of UC. However, the influences of the host-microbiota interaction on the pathophysiology of intestinal fibroblasts remain poorly understood. Here, we reveal that OTUD3 suppresses pathologic activation of fibroblasts exposed to microbial cyclic GMP-AMP (3’3’-cGAMP) by deubiquitinating stimulator of interferon genes (STING) in the colon. Sting deficiency ameliorated dextran sodium sulfate-induced colitis in Otud3-/- mice. In addition, mice harboring an UC risk missense variant in the Otud3 gene showed pathological features of UC in the colon after transplantation of a fecal microbiome with the potential to produce excessive cGAMP from UC patients. Collectively, these results demonstrate the critical role of OTUD3 in the maintenance of intestinal homeostasis and highlight one mechanism of the interaction between the host (OTUD3 in fibroblasts) and microbiota (STING agonist) in UC development.
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Project description:Ulcerative colitis (UC) develops through a complicated interaction between the host and microbiota. Intestinal fibroblasts are suggested to play crucial roles in the pathogenesis of UC. However, the influences of the host-microbiota interaction on the pathophysiology of intestinal fibroblasts remain poorly understood. Here, we reveal that OTUD3 suppresses pathologic activation of fibroblasts exposed to microbial cyclic GMP-AMP (3’3’-cGAMP) by deubiquitinating stimulator of interferon genes (STING) in the colon. Sting deficiency ameliorated dextran sodium sulfate-induced colitis in Otud3-/- mice. In addition, mice harboring an UC risk missense variant in the Otud3 gene showed pathological features of UC in the colon after transplantation of a fecal microbiome with the potential to produce excessive cGAMP from UC patients. Collectively, these results demonstrate the critical role of OTUD3 in the maintenance of intestinal homeostasis and highlight one mechanism of the interaction between the host (OTUD3 in fibroblasts) and microbiota (STING agonist) in UC development.
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