Proteomics

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Mast cell-derived SAMD14 is a novel regulator of the human prostate tumor microenvironment


ABSTRACT: Mast cells (MCs) are important cellular components of the tumor microenvironment and are significantly associated with poor patient outcomes in prostate cancer and other solid cancers. The promotion of tumor progression partly involves heterotypic interactions between MCs and cancer-associated fibroblasts (CAFs) which combine to potentiate a pro-tumor extracellular matrix and promote epithelial cell invasion and migration. Thus far, the interactions between MCs and CAFs remains poorly understood. To identify molecular changes that may alter resident MC function in the prostate tumor microenvironment, we profiled the transcriptome of human prostate MCs, isolated from patient-matched non-tumor and tumor-associated regions of fresh radical prostatectomy tissue. Transcriptomic profiling revealed a distinct gene expression profile of MCs isolated from prostate tumor regions, including the downregulation of SAMD14, a putative tumor suppressor gene. Proteomic profiling revealed overexpression of SAMD14 in HMC-1 MCs altered the secretion of proteins associated with immune regulation and extracellular matrix processes. To assess MC biological function within a model of the prostate tumor microenvironment, HMC-1-SAMD14+ conditioned media was added to co-cultures of primary prostatic CAFs and prostate epithelium. HMC-1-SAMD14+ secretions were shown to reduce the deposition and alignment of matrix produced by CAFs and suppress pro-tumorigenic prostate epithelial morphology. Overall, our data presents the first profile of human MCs derived from patient prostate cancer specimens and identifies MC-derived SAMD14 as an important mediator of MC phenotype and function within the prostate tumor microenvironment.

INSTRUMENT(S): Q Exactive HF

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Blood

DISEASE(S): Prostate Cancer

SUBMITTER: Ralf Schittenhelm  

LAB HEAD: Natalie Lister

PROVIDER: PXD022782 | Pride | 2021-03-12

REPOSITORIES: Pride

Dataset's files

Source:
Action DRS
HF1CH20200827_HMC1_1.raw Raw
HF1CH20200827_HMC1_2.raw Raw
HF1CH20200827_HMC1_3.raw Raw
HF1CH20200827_HMC1_SAMD14_1.raw Raw
HF1CH20200827_HMC1_SAMD14_2.raw Raw
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Publications


Mast cells (MCs) are important cellular components of the tumor microenvironment and are significantly associated with poor patient outcomes in prostate cancer and other solid cancers. The promotion of tumor progression partly involves heterotypic interactions between MCs and cancer-associated fibroblasts (CAFs), which combine to potentiate a pro-tumor extracellular matrix and promote epithelial cell invasion and migration. Thus far, the interactions between MCs and CAFs remain poorly understood  ...[more]

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