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Dualism of FGF and TGFb signaling in activation of heterogeneous cancer-associated fibroblast populations converging on cancer development (RNA-Seq_FGF2)

ABSTRACT: The molecular basis for heterogeneity of cancer-associated fibroblast (CAF) populations remains to be established. We report that fibroblast growth factor (FGF) and transforming growth factor-beta (TGFB) signaling are strong opposite modulators of key CAF effector genes. While FGF activation in normal human dermal fibroblasts (HDFs) induces a number of mitogenic growth factors and metalloproteases, it suppresses expression of pro-fibrotic and cancer-associated extracellular matrix proteins, with TGFB exerting reverse effects. Genetic abrogation or pharmacological inhibition of either pathway results in induction of CAF effector genes responsive to the other, with the ETV1 transcription factor mediating FGF effects and suppressing those of TGFB. This duality of FGF- and TGFB- signaling is reflected in the distinct gene expression profiles of HDFs derived from a large cohort of individuals, multiple Squamous Cell Carcinoma (SCC)-derived CAF strains and stromal fibroblasts underlying premalignant (Actinic Keratoses) and desmoplastic versus non-desmoplastic skin SCC lesions. Functionally, an altered balance between FGF or TGFB signaling, by genetic suppression of either, is sufficient to confer upon HDFs growth enhancing properties on neighboring SCC cells, in vitro and in vivo, in an orthotopic skin cancer model. Thus, activation of heterogeneous CAF populations by deregulation of distinct signaling pathways converges on cancer development with implications of translational significance.

ORGANISM(S): Homo sapiens

PROVIDER: GSE122368 | GEO | 2019/07/31

REPOSITORIES: GEO

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Dualism of FGF and TGFb signaling in activation of heterogeneous cancer-associated fibroblast populations converging on cancer development (CAF_vs_Norm_affy)

Project description:The molecular basis for heterogeneity of cancer-associated fibroblast (CAF) populations remains to be established. We report that fibroblast growth factor (FGF) and transforming growth factor-beta (TGFB) signaling are strong opposite modulators of key CAF effector genes. While FGF activation in normal human dermal fibroblasts (HDFs) induces a number of mitogenic growth factors and metalloproteases, it suppresses expression of pro-fibrotic and cancer-associated extracellular matrix proteins, with TGFB exerting reverse effects. Genetic abrogation or pharmacological inhibition of either pathway results in induction of CAF effector genes responsive to the other, with the ETV1 transcription factor mediating FGF effects and suppressing those of TGFB. This duality of FGF- and TGFB- signaling is reflected in the distinct gene expression profiles of HDFs derived from a large cohort of individuals, multiple Squamous Cell Carcinoma (SCC)-derived CAF strains and stromal fibroblasts underlying premalignant (Actinic Keratoses) and desmoplastic versus non-desmoplastic skin SCC lesions. Functionally, an altered balance between FGF or TGFB signaling, by genetic suppression of either, is sufficient to confer upon HDFs growth enhancing properties on neighboring SCC cells, in vitro and in vivo, in an orthotopic skin cancer model. Thus, activation of heterogeneous CAF populations by deregulation of distinct signaling pathways converges on cancer development with implications of translational significance.

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Dual role of CSL (RBP-Jk) and NOTCH1 in cancer-associated fibroblast genome stability and expansion [RNA-seq]

Project description:Genomic instability is a hallmark of cancer. Whether or not it also occurs in cancer-associated fibroblasts (CAFs) is a question of importance for the cancer/stromal cell co-evolution process. We find that DNA damage, telomere shortening and chromosome fusions occur at early times of CAF activation, as triggered by silencing of the CSL/RBP-J-κ gene in primary human dermal fibroblasts (HDFs) from multiple individuals. Similar alterations occur in skin Squamous Cell Carcinoma (SCC) - derived CAFs, in which CSL is down-modulated, versus HDFs from unaffected skin of the same patients. Mechanistically, CSL is part of a telomere protective complex with UPF1, KU70, and KU80 proteins, which fail to bind to telomeres in the absence of CSL. In CAFs, persistent genomic instability is associated with frequent amplification and overexpression of NOTCH1 gene, which is required to suppress DNA damage-induced ATM/P53 activation and growth arrest. These findings are of translational significance as, in an orthotopic model of skin SCC, genetic or pharmacological suppression of NOTCH1 activity suppresses cancer/stromal cell proliferation and expansion.

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Transcriptomic analysis of human dermal fibroblasts overexpressing ANKRD1.

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Transcriptomic analysis of CAFs with silencing of ANKRD1.

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Dualism of FGF and TGFb signaling in activation of heterogeneous cancer-associated fibroblast populations converging on cancer development

Project description:Dualism of FGF and TGFb signaling in activation of heterogeneous cancer-associated fibroblast populations converging on cancer development

| PRJNA504805 | ENA

Androgen receptor functions as transcriptional repressor of Cancer Associated Fibroblast (CAF) activation [ChIP-seq]

Project description:The age-associated increase of cancer risk has been linked with stromal fibroblast senescence and early steps of Cancer Associated Fibroblast (CAF) activation. Surprisingly little is known about the role of androgen receptor (AR) signalling in this context. We show that AR expression is down-modulated in stromal fibroblasts underlying premalignant skin cancer lesions (actinic keratoses, AK) as well as in CAFs from the three major skin cancer types, squamous (SCC) and basal cell (BCC) carcinomas and melanomas. Decreased AR expression is linked to the concomitant down-modulation of CSL, key effector of canonical Notch signalling and global modulator of chromatin configuration, and it can be counteracted by treatment with BET inhibitors, which reverse CAF activation. Functionally, AR gene silencing in dermal fibroblasts results in p53-dependent senescence and induction of key CAF-effector genes, with AR physically converging with CSL in negative control of these genes. The findings are of functional significance as, in an orthotopic model of skin cancer, dermal fibroblasts with AR loss enhance significantly tumorigenicity of SCC and melanoma cells. As such, the findings establish AR as a novel potential target for stroma-focused cancer prevention and treatment.

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