Cancer-Associated Mesothelial Cell-Derived ANGPTL4 and STC1 Promote the early steps of Ovarian Cancer metastasis
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA925158 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR23111700_1.fastq.gz | Fastqsanger.gz | |||
| SRR23111700_2.fastq.gz | Fastqsanger.gz | |||
| SRR23111701_1.fastq.gz | Fastqsanger.gz | |||
| SRR23111701_2.fastq.gz | Fastqsanger.gz | |||
| SRR23111702_1.fastq.gz | Fastqsanger.gz |
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Project description:Ovarian Cancer preferentially metastasizes in association with mesothelial cell-lined surfaces.We sought to determine if mesothelial cells are required for OvCa metastasis and detect alterations in mesothelial cell gene expression upon interaction with OvCa cells. To evaluate the OvCa-induced transcriptome changes in mesothelial cells, primary human mesothelial cells from 10 patients were treated with OvCa conditioned media or ascites and RNAseq analysis was performed.
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Project description:Ovarian cancer (OvCa) preferentially metastasizes in association with mesothelial cell-lined surfaces. We sought to determine if mesothelial cells are required for OvCa metastasis and detect alterations in mesothelial cell gene expression and cytokine secretion upon interaction with OvCa cells. Using omental samples from patients with high-grade serous OvCa and mouse models with Wt1-driven GFP-expressing mesothelial cells, we validated the intratumoral localization of mesothelial cells during human and mouse OvCa omental metastasis. Removing mesothelial cells ex vivo from human and mouse omenta or in vivo using diphtheria toxin-mediated ablation in Msln-Cre mice significantly inhibited OvCa cell adhesion and colonization. Human ascites induced angiopoietin-like 4 (ANGPTL4) and stanniocalcin 1 (STC1) expression and secretion by mesothelial cells. Inhibition of STC1 or ANGPTL4 via RNAi obstructed OvCa cell-induced mesothelial cell to mesenchymal transition while inhibition of ANGPTL4 alone obstructed OvCa cell-induced mesothelial cell migration and glycolysis. Inhibition of mesothelial cell ANGPTL4 secretion via RNAi prevented mesothelial cell-induced monocyte migration, endothelial cell vessel formation, and OvCa cell adhesion, migration, and proliferation. In contrast, inhibition of mesothelial cell STC1 secretion via RNAi prevented mesothelial cell-induced endothelial cell vessel formation and OvCa cell adhesion, migration, proliferation, and invasion. Additionally, blocking ANPTL4 function with Abs reduced the ex vivo colonization of 3 different OvCa cell lines on human omental tissue explants and in vivo colonization of ID8p53-/-Brca2-/- cells on mouse omenta. These findings indicate that mesothelial cells are important to the initial stages of OvCa metastasis and that the crosstalk between mesothelial cells and the tumor microenvironment promotes OvCa metastasis through the secretion of ANGPTL4.
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Project description:Evaluation of X-linked gene expression in MEFs isolated from STC1 wild type and knock out mice X chromosome inactivation (XCI) is initiated in cis by the Xist RNA, which coats the inactive X chromosome (Xi) from which it is produced. We performed a large-scale RNA interference screen to identify trans-acting XCI factors (XCIFs) that comprise regulators of cell signaling and transcription. We find that the XCIFs promote Xist expression and/or localization to the Xi. One of the XCIFs, STC1, is a glycoprotein found in both the cytoplasm and nucleus and whose function is poorly understood. A homozygous mouse knockout of STC1 has a defect in XCI but surprisingly is phenotypically normal. We performed transcriptome profiling (RNA-Seq) experiments to determine whether the expression levels of X-encoded genes were elevated in Stc1-/- female MEFs. In these experiments, RNA was prepared from three independent cultures of Stc1+/+ or Stc1-/- female MEFs. RNA samples were processed and amplified followed by deep sequencing. The similarity of X-linked gene expression between Stc1+/+ and Stc1-/- MEFs was statistically significant. The vast majority of autosomal genes were also expressed at comparable levels in Stc1+/+ and Stc1-/- MEFs. Sequenced mRNA isolated from the STC1+/+ or STC1-/- MEFs.
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