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Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
Published on: September 20, 2018
HIC1 modulates prostate cancer progression by epigenetic modification
Jianghua Zheng1, Jinglong Wang, Xueqing Sun
1Department of Biochemistry and Molecular Cell Biology, Shanghai Jiao Tong University School of Medicine, China.
Summary
Hypermethylation of the HIC1 gene promoter in prostate cancer leads to its loss of function, driving cancer progression. Targeting these epigenetic changes offers a potential new treatment strategy for prostate cancer.
Area of Science:
- Oncology
- Epigenetics
- Molecular Biology
Background:
- Prostate cancer is a leading cause of cancer death in men, with increasing incidence globally.
- Epigenetic modifications, such as DNA methylation, play a crucial role in cancer development and progression.
- The precise mechanisms driving prostate cancer progression are not fully understood.
Purpose of the Study:
- To investigate the methylation status of the hypermethylated in cancer 1 (HIC1) gene in prostate cancer.
- To determine the functional role of HIC1 in prostate cancer progression, including proliferation, migration, invasion, tumorigenesis, and metastasis.
- To identify downstream targets of HIC1 in prostate cancer.
Main Methods:
- Assessed HIC1 promoter methylation in cell lines, tissues, and plasma using methylation-specific PCR and bisulfate sequencing PCR.
- Evaluated HIC1's functional impact on cancer cell behavior (proliferation, migration, invasion) and in vivo tumor growth, metastasis, and bone destruction in mouse models.
- Utilized microarrays, reporter gene assays, and chromatin immunoprecipitation to identify and validate HIC1's downstream target gene, CXCR7.
Main Results:
- Found abundant HIC1 promoter methylation in prostate cancer samples compared to normal controls.
- Restoring HIC1 expression inhibited prostate cancer cell proliferation, migration, invasion, and induced apoptosis.
- Demonstrated that HIC1 suppresses tumor growth, metastasis, and bone destruction in vivo, and identified CXCR7 as a direct downstream target negatively regulated by HIC1.
Conclusions:
- Hypermethylation of the HIC1 promoter causes loss of its tumor-suppressive function, promoting prostate cancer progression and invasion.
- Epigenetic regulation of HIC1 presents a promising therapeutic target for prostate cancer treatment.
- Targeting epigenetic events that modulate HIC1 expression may offer novel strategies for effective prostate cancer therapy.
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