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Author Spotlight: Exploring Salidroside's Molecular Mechanisms in Breast Cancer Treatment
Published on: June 9, 2023
SDPR functions as a metastasis suppressor in breast cancer by promoting apoptosis
Sait Ozturk1, Panagiotis Papageorgis2, Chen Khuan Wong2
1Cell and Molecular Biology Graduate Program, Boston University School of Medicine, Boston, MA 02118; Molecular and Translational Medicine Graduate Program, Department of Medicine, Boston University School of Medicine, Boston, MA 02118; Biomedical Genetics Section and Cancer Center, Department of Medicine, Boston University School of Medicine, Boston, MA 02118;
Abstract:
Metastatic dissemination of breast cancer cells represents a significant clinical obstacle to curative therapy. The loss of function of metastasis suppressor genes is a major rate-limiting step in breast cancer progression that prevents the formation of new colonies at distal sites. However, the discovery of new metastasis suppressor genes in breast cancer using genomic efforts has been slow, potentially due to their primary regulation by epigenetic mechanisms. Here, we report the use of model cell lines with the same genetic lineage for the identification of a novel metastasis suppressor gene, serum deprivation response (SDPR), localized to 2q32-33, a region reported to be associated with significant loss of heterozygosity in breast cancer. In silico metaanalysis of publicly available gene expression datasets suggests that the loss of expression of SDPR correlates with significantly reduced distant-metastasis-free and relapse-free survival of breast cancer patients who underwent therapy. Furthermore, we found that stable SDPR overexpression in highly metastatic breast cancer model cell lines inhibited prosurvival pathways, shifted the balance of Bcl-2 family proteins in favor of apoptosis, and decreased migration and intravasation/extravasation potential, with a corresponding drastic suppression of metastatic nodule formation in the lungs of NOD/SCID mice. Moreover, SDPR expression is silenced by promoter DNA methylation, and as such it exemplifies epigenetic regulation of metastatic breast cancer progression. These observations highlight SDPR as a potential prognostic biomarker and a target for future therapeutic applications.
Insights
Researchers identified serum deprivation response (SDPR) as a novel metastasis suppressor gene in breast cancer. Loss of SDPR expression correlates with poor patient survival and reduced metastasis, highlighting its potential as a biomarker and therapeutic target.
Area of Science:
- Oncology
- Genetics
- Epigenetics
Background:
- Metastatic breast cancer is a major challenge in treatment, often driven by the loss of metastasis suppressor genes.
- Epigenetic mechanisms may hinder the discovery of these crucial genes.
- Identifying novel metastasis suppressor genes is vital for understanding breast cancer progression.
Purpose of the Study:
- To identify novel metastasis suppressor genes in breast cancer.
- To investigate the role of serum deprivation response (SDPR) in breast cancer metastasis.
- To explore SDPR as a potential prognostic biomarker and therapeutic target.
Main Methods:
- Utilized isogenic cell lines for novel metastasis suppressor gene discovery.
- Performed in silico metaanalysis of gene expression datasets.
- Overexpressed SDPR in metastatic breast cancer cell lines and assessed its effects on cellular pathways and metastatic potential in vivo.
- Investigated SDPR gene silencing via promoter DNA methylation.
Main Results:
- Identified serum deprivation response (SDPR) as a novel metastasis suppressor gene located at 2q32-33.
- Loss of SDPR expression significantly correlates with reduced distant-metastasis-free and relapse-free survival in breast cancer patients.
- SDPR overexpression suppressed prosurvival pathways, induced apoptosis, decreased cell migration and invasion, and reduced lung metastasis in mice.
- SDPR expression is epigenetically silenced by promoter DNA methylation.
Conclusions:
- SDPR acts as a critical metastasis suppressor in breast cancer.
- Epigenetic silencing of SDPR contributes to breast cancer progression.
- SDPR is a promising prognostic biomarker and a potential therapeutic target for metastatic breast cancer.
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