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Mutagenesis and Analysis of Genetic Mutations in the GC-rich KISS1 Receptor Sequence Identified in Humans with Reproductive Disorders
Published on: September 4, 2011
Functional interrelationship between the WASF3 and KISS1 metastasis-associated genes in breast cancer cells
Yong Teng1, Mingyao Liu, John K Cowell
1School of Medicine, Medical College of Georgia, Augusta, GA, USA.
Abstract:
Loss of WASF3 function in breast cancer cells results in loss of invasion phenotypes and reduced metastatic potential. By using oligonucleotide arrays, we now demonstrate that knockdown of WASF3 leads to the upregulation of the KISS1 metastasis suppressor gene with concomitant reduced invasion and loss of matrix metalloproteinases (MMP)-9 activity. Using a luciferase reporter, KISS1 transcription is significantly increased in the absence of WASF3. Knockdown of KISS1 in WASF3-silenced cells resulted in the recovery of the invasion phenotype. WASF3 knockdown also resulted in elevated IκBα levels in the cytoplasm and reduced levels of nuclear factor-kappa-B (NF-κB) p65/50 subunits in the nucleus. Tumor necrosis factor-alpha (TNF-α) has been associated with cell invasion through induction of MMP-9 production via KISS1 regulation of the NF-κB pathway. When WASF3 knockdown cells are treated with TNF-α, no effect is seen on invasion or nuclear translocation of NF-κB. Thus, coordinated expression patterns of the WASF3 metastasis promoter gene and the KISS1 metastasis suppressor gene appear to exert their influence through inhibition of NF-κB signaling, which in turn regulates MMP-9 production facilitating invasion.
Insights
Loss of WASF3 in breast cancer cells reduces metastasis. WASF3 knockdown upregulates KISS1, suppressing invasion and matrix metalloproteinases-9 activity by inhibiting NF-κB signaling.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Metastasis Research
Background:
- The protein WASF3 promotes breast cancer cell invasion and metastasis.
- Understanding the molecular mechanisms regulating WASF3 function is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate the role of WASF3 in regulating metastasis suppressor gene KISS1 and the NF-κB signaling pathway in breast cancer cells.
- To elucidate the interplay between WASF3, KISS1, and NF-κB in controlling cancer cell invasion.
Main Methods:
- Oligonucleotide arrays were used to analyze gene expression changes upon WASF3 knockdown.
- Luciferase reporter assays assessed KISS1 transcriptional activity.
- Western blotting detected protein levels of IκBα and NF-κB subunits.
- Functional assays evaluated cell invasion and matrix metalloproteinases-9 activity.
Main Results:
- WASF3 knockdown led to increased KISS1 expression, reduced invasion, and decreased matrix metalloproteinases-9 (MMP-9) activity.
- KISS1 transcription was significantly upregulated in the absence of WASF3, and its knockdown restored invasion.
- WASF3 silencing elevated cytoplasmic IκBα and reduced nuclear NF-κB translocation, abrogating TNF-α-induced invasion.
Conclusions:
- WASF3 promotes breast cancer invasion and metastasis, partly by suppressing KISS1 expression and facilitating NF-κB signaling.
- The coordinated regulation of WASF3 and KISS1 influences NF-κB pathway activity, impacting MMP-9 production and cell invasion.
- Targeting WASF3 may represent a therapeutic strategy to inhibit breast cancer metastasis.
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