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Microarray Analysis Reveals Overexpression of both Integral Membrane and Cytosolic Tight Junction Genes in
Maria E Cuevas1, Chance P Winters1, Maria C Todd1
1Biology Department, Southwestern University, Georgetown, TX 78626.
Abstract:
Deregulation of tight junction (TJ) proteins and the associated disruption of TJ function has been demonstrated to play a role in the development of endometrial cancer. In the current study, we have shown overexpression of claudin-3 and -4 mRNA (by RT-PCR) and protein (by immunoblotting) in a panel of 9 human endometrial cancer cell lines. To further expand our understanding of the complex role of TJ deregulation in endometrial cancer, we also investigated the expression of 84 TJ and TJ-associated genes (encoding the array of proteins that function within the TJ network from the membrane to nuclear signaling pathways) by microarray analysis. Consistent with the claudin-3 and -4 RT-PCR and immunoblot findings described above, we observed overexpression of the claudin-3 and -4 genes by microarray analysis. Further, we observed overexpression of an additional three genes in 8 of the 9 endometrial cancer cell lines: OCLN (occludin), F11R (JAM-A) and TJP3 (ZO-3). OCLN and F11R encode integral membrane proteins whereas TJP3 encodes a cytosolic scaffolding protein that indirectly links membrane TJ proteins to the actin cytoskeleton and cell signaling pathways. Our data suggest that the structural disruption of TJs coupled with the downstream deregulation of signaling pathways involved in cellular proliferation and migration may contribute to the development of endometrial cancer.
Insights
Tight junction (TJ) protein deregulation is implicated in endometrial cancer. This study found overexpression of claudin-3, claudin-4, occludin, JAM-A, and ZO-3 genes in endometrial cancer cell lines, suggesting a role in disease development.
Area of Science:
- Oncology
- Cell Biology
- Molecular Biology
Background:
- Deregulation of tight junction (TJ) proteins disrupts TJ function, contributing to endometrial cancer development.
- Understanding the specific TJ proteins involved is crucial for comprehending endometrial cancer pathogenesis.
Purpose of the Study:
- To investigate the expression of TJ and TJ-associated genes in human endometrial cancer cell lines.
- To identify specific TJ proteins that are overexpressed and may play a role in endometrial cancer.
Main Methods:
- Reverse transcription-polymerase chain reaction (RT-PCR) to detect claudin-3 and -4 mRNA.
- Immunoblotting to confirm claudin-3 and -4 protein overexpression.
- Microarray analysis of 84 TJ and TJ-associated genes in 9 endometrial cancer cell lines.
Main Results:
- Overexpression of claudin-3 and claudin-4 mRNA and protein confirmed in endometrial cancer cell lines.
- Microarray analysis revealed overexpression of claudin-3 and claudin-4 genes.
- Additional overexpression of OCLN (occludin), F11R (JAM-A), and TJP3 (ZO-3) genes observed in 8 out of 9 cell lines.
Conclusions:
- Structural disruption of TJs, indicated by the overexpression of specific TJ proteins like claudins, occludin, JAM-A, and ZO-3, may contribute to endometrial cancer.
- Deregulation of TJ-associated signaling pathways involved in proliferation and migration likely plays a role in endometrial cancer development.
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