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Brain-metastatic triple-negative breast cancer cells regain growth ability by altering gene expression patterns
Youn Kyung Choi1, Sang-Mi Woo, Sung-Gook Cho
1Cancer Research Institute, Ischemic/Hypoxia Disease Institute, Seoul National University College of Medicine, 103 Daehak-ro, Jongno-gu, Seoul, 110-799, South Korea. Tel: +82 220723993, paeksh@snu.ac.kr.
Unlabelled:
BACKGROUD/AIM: Triple-negative breast cancer (TNBC) frequently metastasizes to the brain (BrM). However, genes responsible for BrM of TNBC are yet to be identified.
Materials And Methods:
Gene expression profiling of TNBC and BrM was conducted, and studies with cultured cells in vitro were performed to verify functions of genes identified in these analyses.
Results:
According to gene expression analyses of TNBC and BrM, periplakin (PPL) and mitogen-activated protein kinase 13 (MAPK13) were chosen for further investigations. PPL and MAPK13 were highly expressed in TNBC compared to BrM. While silencing of either PPL or MAPK13 in TNBC cells increased cell growth and reduced cell motility, overexpression of either PPL or MAPK13 in BrM cells, retarded growth rates and facilitated cell motility.
Conclusion:
Gene expression patterns in TNBC and BrM reflect cancer cell growth in regions of metastasis.
Insights
Genes periplakin (PPL) and mitogen-activated protein kinase 13 (MAPK13) influence triple-negative breast cancer brain metastasis. Their expression levels in cancer cells correlate with growth and motility in metastatic environments.
Area of Science:
- Oncology
- Genetics
- Cancer Metastasis Research
Background:
- Triple-negative breast cancer (TNBC) commonly metastasizes to the brain (BrM).
- The specific genes driving TNBC brain metastasis remain largely unidentified.
- Understanding these genetic drivers is crucial for developing targeted therapies.
Purpose of the Study:
- To identify genes responsible for brain metastasis in triple-negative breast cancer.
- To investigate the functional roles of identified genes in TNBC and brain metastatic cells.
- To correlate gene expression patterns with cancer cell behavior at metastatic sites.
Main Methods:
- Gene expression profiling was performed on TNBC and BrM samples.
- In vitro studies using cultured cells were conducted to validate gene functions.
- Expression levels of periplakin (PPL) and MAPK13 were analyzed in different cell contexts.
Main Results:
- Periplakin (PPL) and mitogen-activated protein kinase 13 (MAPK13) were identified as key genes.
- PPL and MAPK13 showed higher expression in TNBC compared to BrM.
- Silencing PPL or MAPK13 in TNBC cells enhanced growth and reduced motility; overexpression in BrM cells had opposite effects.
Conclusions:
- Gene expression patterns in TNBC and BrM are indicative of cancer cell growth dynamics at metastatic sites.
- PPL and MAPK13 play significant roles in regulating TNBC cell behavior during brain metastasis.
- These findings provide insights into the molecular mechanisms of TNBC brain metastasis.
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