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Decreased expression of SOCS-3 mRNA in breast cancer with lymph node metastasis
Tsuyoshi Nakagawa1, Satoru Iida, Takayuki Osanai
1Department of Surgical Oncology, Tokyo Medical and Dental University, Tokyo 113-8519, Japan. nakagawa.srg2@tmd.ac.jp
Abstract:
Signal transducers and activators of transcription (STATs) play a pleomorphic role in signal transduction, similarly to an oncogene. Suppressors of cytokine signaling (SOCS) inhibit STAT pathways. In breast cancer, little is known about the correlation among STATs, SOCS, and clinicopathological/biological features. Therefore, we investigated p-STAT3 (activated form of STAT3) and SOCS-1/3 expression, and clarified their correlation. Immunohistochemical staining for p-STAT3 antigen was performed in 74 surgically resected primary breast cancers. Real-time RT-PCR was used to measure mRNA expression of SOCS-1 and SOCS-3. There were no significant correlations between p-STAT3 expression and clinicopathological/biological features. SOCS-3 mRNA expression in the lymph node-positive group was significantly lower than that in the negative group (p=0.013). Among three groups divided based on the number of involved lymph nodes (node-negative group, 1-3 involved nodes group, 4 or more involved nodes group), the group with 4 or more involved nodes had the lowest expression of SOCS-3 (p=0.043). Correlations were not seen between SOCS-1 and SOCS-3 expression and other clinicopathological/biological features, except for blood vessel invasion. There were no statistical correlations between either SOCS-1 or SOCS-3 mRNA expression and p-STAT3 expression. Reduced expression of SOCS-3 is closely related to lymph node metastasis. Therefore, SOCS-3 may be a good predictor for lymph node metastasis.
Insights
Reduced expression of Suppressors of Cytokine Signaling-3 (SOCS-3) in breast cancer correlates with lymph node metastasis. This finding suggests SOCS-3 may serve as a predictive biomarker for metastasis in breast cancer patients.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Signal transducers and activators of transcription (STATs) are crucial in cellular signaling and can act as oncogenes.
- Suppressors of Cytokine Signaling (SOCS) proteins regulate STAT pathways.
- The interplay between STATs, SOCS, and breast cancer progression is not well understood.
Purpose of the Study:
- To investigate the expression of phosphorylated STAT3 (p-STAT3) and SOCS-1/3 in primary breast cancer.
- To clarify the correlation between p-STAT3, SOCS-1/3 expression, and clinicopathological/biological features.
- To determine if SOCS-3 expression predicts lymph node metastasis.
Main Methods:
- Immunohistochemical staining for p-STAT3 in 74 primary breast cancer samples.
- Real-time RT-PCR to quantify SOCS-1 and SOCS-3 mRNA expression.
- Statistical analysis to correlate protein/mRNA expression with clinicopathological data.
Main Results:
- No significant correlation was found between p-STAT3 expression and clinicopathological features.
- Lower SOCS-3 mRNA expression was observed in lymph node-positive cases compared to node-negative cases (p=0.013).
- Significantly reduced SOCS-3 expression was noted in patients with 4 or more involved lymph nodes (p=0.043).
- No correlation was found between SOCS-1/3 expression and p-STAT3 levels.
- SOCS-1/3 expression showed a correlation with blood vessel invasion but not other features.
Conclusions:
- Reduced SOCS-3 expression is significantly associated with lymph node metastasis in breast cancer.
- SOCS-3 may function as a potential biomarker for predicting lymph node metastasis.
- Further research is warranted to explore the role of SOCS-3 in breast cancer progression.