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Updated: Aug 25, 2025
Author Spotlight: Assessing the Potential of Circulating Tumor Cells in Leptomeningeal Disease Research
Published on: March 29, 2024
Loss of NECTIN1 triggers melanoma dissemination upon local IGF1 depletion
Julien Ablain1,2, Amira Al Mahi3, Harriet Rothschild4
1Centre de Recherche en Cancérologie de Lyon, Centre Léon Bérard, INSERM U1052 CNRS UMR5286, Lyon, France. julien.ablain@lyon.unicancer.fr.
Abstract:
Cancer genetics has uncovered many tumor-suppressor and oncogenic pathways, but few alterations have revealed mechanisms involved in tumor spreading. Here, we examined the role of the third most significant chromosomal deletion in human melanoma that inactivates the adherens junction gene NECTIN1 in 55% of cases. We found that NECTIN1 loss stimulates melanoma cell migration in vitro and spreading in vivo in both zebrafish and human tumors specifically in response to decreased IGF1 signaling. In human melanoma biopsy specimens, adherens junctions were seen exclusively in areas with low IGF1 levels, but not in NECTIN1-deficient tumors. Our study establishes NECTIN1 as a major determinant of melanoma dissemination and uncovers a genetic control of the response to microenvironmental signals.
Insights
Loss of the NECTIN1 gene promotes melanoma cell migration and spreading, particularly when Insulin-like Growth Factor 1 (IGF1) signaling is low. This study identifies NECTIN1 as crucial for melanoma dissemination.
Area of Science:
- Oncology
- Cancer Genetics
- Melanoma Research
Background:
- Cancer genetics has identified numerous oncogenic and tumor-suppressor pathways.
- Few genetic alterations have elucidated mechanisms driving tumor metastasis.
- The adherens junction gene NECTIN1 is frequently inactivated in melanoma.
Purpose of the Study:
- To investigate the role of NECTIN1 inactivation in melanoma progression.
- To understand the relationship between NECTIN1, cell migration, and microenvironmental signals.
- To identify genetic determinants of melanoma dissemination.
Main Methods:
- Analysis of chromosomal deletions in human melanoma.
- In vitro assessment of melanoma cell migration.
- In vivo studies using zebrafish and human tumor models.
- Examination of human melanoma biopsy specimens for adherens junctions and IGF1 levels.
Main Results:
- Nectin cell adhesion molecule 1 (NECTIN1) gene deletion was found in 55% of human melanoma cases.
- NECTIN1 loss enhanced melanoma cell migration and in vivo spreading.
- This effect was specifically linked to decreased Insulin-like Growth Factor 1 (IGF1) signaling.
- Adherens junctions were present only in melanoma areas with low IGF1, not in NECTIN1-deficient tumors.
Conclusions:
- NECTIN1 is a significant factor in controlling melanoma dissemination.
- The study reveals a genetic mechanism regulating melanoma response to microenvironmental cues like IGF1.
- Targeting NECTIN1 or understanding IGF1 interactions may offer new therapeutic strategies for melanoma metastasis.
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