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Published on: February 28, 2017
Negative Regulatory Loop between Microphthalmia-Associated Transcription Factor (MITF) and Notch Signaling
1Department of Human Genetics and Biochemistry, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv 69978, Israel. golantammy@gmail.com.
Abstract:
Melanoma, a melanocyte-origin neoplasm, is a highly metastatic and treatment-resistance cancer. While it is well established that notch signaling activation promotes melanoma progression, little is known about the reciprocal interactions between Notch signaling and melanoma-specific pathways. Here we reveal a negative regulatory loop between Notch signaling and microphthalmia-associated transcription factor (MITF), the central regulator of melanoma progression and the driver of melanoma plasticity. We further demonstrate that Notch signaling activation, in addition to the known competition-based repression mechanism of MITF transcriptional activity, inhibits the transcription of MITF, leading to a decrease in MITF expression. We also found that MITF binds to the promoter of the gene encoding the master regulator of Notch signaling, recombination signal binding protein J kappa (RBPJK), leading to its upregulation. Our findings suggest that, once activated, Notch signaling represses MITF signaling to maintain the melanoma invasiveness and metastatic phenotype.
Insights
Notch signaling negatively regulates microphthalmia-associated transcription factor (MITF) in melanoma. This interaction, involving MITF upregulating RBPJK, promotes melanoma
Area of Science:
- Oncology
- Molecular Biology
- Cancer Research
Background:
- Melanoma is an aggressive, treatment-resistant cancer originating from melanocytes.
- Notch signaling activation is known to promote melanoma progression.
- Reciprocal interactions between Notch signaling and melanoma pathways remain largely unexplored.
Purpose of the Study:
- To investigate the regulatory loop between Notch signaling and microphthalmia-associated transcription factor (MITF).
- To elucidate the impact of Notch signaling on MITF expression and function in melanoma.
- To understand the role of MITF in regulating Notch signaling components.
Main Methods:
- Analysis of the regulatory relationship between Notch signaling and MITF.
- Investigating the transcriptional regulation of MITF by Notch signaling.
- Assessing the binding of MITF to the promoter of the RBPJK gene.
Main Results:
- A negative regulatory loop between Notch signaling and MITF was identified.
- Notch signaling inhibits MITF transcription, reducing MITF expression.
- MITF upregulates the expression of RBPJK, a key regulator of Notch signaling.
Conclusions:
- Notch signaling activation represses MITF to sustain melanoma invasiveness and metastatic potential.
- The interplay between Notch and MITF is crucial for melanoma progression.
- Targeting this regulatory loop may offer new therapeutic strategies for melanoma.
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