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HMGA1 and FOXM1 synergistically regulate a common gene network modulating angiogenesis in breast cancer

ABSTRACT: One of the factors involved in TNBC aggressiveness is HMGA1, a member of non-histone chromatin proteins. The High mobility group A1 is an architectural transcription factor which, by altering chromatin structure and interacting with transcription factors, can regulate the transcription of several genes. HMGA1 protein is defined as an oncofetal protein as it is highly expressed during the embryogenesis while its expression decreases or is absent in adults, and it is re-expressed in a variety of tumors, including breast cancer. Several works established that, in breast cancer, HMGA1 expression is correlated with high tumor grade and tumor metastasis, resistance to therapies and poor prognosis. The goal of this project is to find out in details, which are the genes that are modulated by HMGA1 in MDA-MB-231 triple negative breast cancer cell line model.

ORGANISM(S): Homo sapiens

PROVIDER: GSE129915 | GEO | 2019/07/29

REPOSITORIES: GEO

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Project description:Metabolic reprogramming is a typical feature of tumors, in which biological macromolecules and energy produced in abnormal metabolism meet the requirements of highly proliferative tumor cells and participate in multiple stages of tumor development. High mobility group A1 (HMGA1) is a structural transcription factor, which plays a carcinogenic role in regulating the transcription of oncogenes. Bioinformatics analysis showed that HMGA1 was overexpressed in human CRC. However, the mechanisms by which HMGA1 promotes the tumorigenesis of CRC remains unknown. Herein, we applied intestinal epithelium conditional knockout (Hmga1△IEC) and knock-in (Hmga1IEC-OE/+) mice of HMGA1 to induce CRC, and identified that HMGA1 promotes colorectal cancer growth by increasing lipid synthesis. Single-cell sequencing (scRNA seq) and immunohistochemical staining showed that HMGA1 was highly expressed in the epithelial cells of CRC. HMGA1 promoted the CRC cell proliferation and accelerated CRC development in HMGA1-knock-in (Hmga1IEC-OE/+) mice. Knockout of HMGA1 (Hmga1△IEC) in intestinal epithelial cells of mice reduced the lipid accumulation and inhibited the occurrence and development of CRC. We further characterized that HMGA1 upregulated the level of fatty acid synthase (FASN) through enhancing the transcriptional binding of sterol regulatory element-binding protein 1 (SREBP1) to the promoter of FASN, leading to an increase in lipid synthesis in intestinal epithelial cells. High fat diet (HFD) aggravated the malignant progression of CRC in Hmga1△IEC mice and reversed the inhibitory effect of HMGA1 depletion on CRC. Administration Orlistat (50 mg/kg), an inhibitor of FASN-mediated lipid synthesis, into Hmga1-knock-in (Hmga1IEC-OE/+) mice markedly reduced lipid accumulation in intestinal epithelial cells and decreased the tumorigenesis of CRC. Taken together, our data suggest that HMGA1 promotes the tumorigenesis of colorectal cancer by up-regulating FASN-mediated de novo fatty acid synthesis. Our findings provide strong evidence supporting therapeutic intervention of lipid accumulation for the prevention and treatment of CRC

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HMGA1 and FOXM1 synergistically regulate a common gene network modulating angiogenesis in breast cancer

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