Cited by 11Cancer Cells and MetastasisTGF-β signaling in diseasesMelanoma and MAPK Pathways

Differentiation States of Phenotypic Transition of Melanoma Cells Are Revealed by 3D Cell Cultures

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Fontana, Fabrizio, Sommariva, Michele, Anselmi, Martina, Bianchi, Francesca, Limonta, Patrizia, Gagliano, Nicoletta·2024·Cells

Abstract

Melanoma is characterized by high metastatic potential favored by the epithelial-to-mesenchymal transition (EMT), leading melanoma cells to exhibit a spectrum of typical EMT markers. This study aimed to analyze the expression of EMT markers in A375 and BLM melanoma cell lines cultured in 2D monolayers and 3D spheroids using morphological and molecular methods. The expression of EMT markers was strongly affected by 3D arrangement and revealed a hybrid phenotype for the two cell lines. Indeed, although E-cadherin was almost undetectable in both A375 and BLM cells, cortical actin was detected in A375 2D monolayers and 3D spheroids and was strongly expressed in BLM 3D spheroids. The mesenchymal marker N-cadherin was significantly up-regulated in A375 3D spheroids while undetectable in BLM cells, but vimentin was similarly expressed in both cell lines at the gene and protein levels. This pattern suggests that A375 cells exhibit a more undifferentiated/mesenchymal phenotype, while BLM cells have more melanocytic/differentiated characteristics. Accordingly, the Zeb1 and 2, Slug, Snail and Twist gene expression analyses showed that they were differentially expressed in 2D monolayers compared to 3D spheroids, supporting this view. Furthermore, A375 cells are characterized by a greater invasive potential, strongly influenced by 3D arrangement, compared to the BLM cell line, as evaluated by SDS-zymography and TIMPs gene expression analysis. Finally, TGF-β1, a master controller of EMT, and lysyl oxidase (LOX), involved in melanoma progression, were strongly up-regulated by 3D arrangement in the metastatic BLM cells alone, likely playing a role in the metastatic phases of melanoma progression. Overall, these findings suggest that A375 and BLM cells possess a hybrid/intermediate phenotype in relation to the expression of EMT markers. The former is characterized by a more mesenchymal/undifferentiated phenotype, while the latter shows a more melanocytic/differentiated phenotype. Our results contribute to the characterization of the role of EMT in melanoma cells and confirm that a 3D cell culture model could provide deeper insight into our understanding of the biology of melanoma.

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Crossref · 10.3390/cells13020181

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  • In melanoma cells, gene expression remained largely unchanged between monolayer and monolayer-with-ECM conditions, while spheroid cultures exhibited substantial differences.

    “transcriptomic analysis of melanoma cells cultured as monolayers, monolayers with ECM, and spheroids revealed that gene expression remained largely unchanged between the two monolayer conditions, while spheroid cultures exhibited substantial differences [194,195].”

    From Modeling Tumor Microenvironment Complexity In Vitro: Spheroids as Physiologically Relevant Tumor Models and Strategies for Their Analysis (2025) · cites this paper as [195]

    The Results (section 3.4; page unavailable) report differences in selected gene-expression markers between 2D monolayers and 3D spheroids. The Cell Cultures methods (section 2.1; page unavailable) describe those two conditions, but no monolayer-with-ECM condition; the paper therefore does not support the claimed comparison between the two monolayer conditions or characterize its analysis as transcriptomic. (LLM, conf=0.88)

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Authors
Fontana, F., Sommariva, M., Anselmi, M., Bianchi, F., Limonta, P., & Gagliano, N.
Affiliations
  • University of Milan (IT)
  • Department of Pharmacological and Biomolecular Sciences “Rodolfo Paoletti”, Università degli Studi di Milano, 20133 Milan, Italy
Corresponding author
Gagliano, Nicoletta
Venue
Cells
Publisher
MDPI AG
Published
2024-01-17
Volume
13
Issue
2
Pages
181
ISSN
2073-4409 (ISSN-L)
OpenAlex
W4390985470
Cited by
11
References
93
Citations by year
2026: 4 · 2025: 5 · 2024: 2
FWCI
1.87
Type
journal article
Language
en
Open access
Locations
  • Cells (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • Seal of Excellence—SoE SEED 2020, Università degli Studi di Milano
  • AIRC fellowship for Italy
  • Fondazione Umberto Veronesi
Topics
  • Health Sciences › Medicine › Oncology › Cancer Cells and Metastasis
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › TGF-β signaling in diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Melanoma and MAPK Pathways
Keywords
melanoma, epithelial-mesenchymal transition, multicellular spheroids, monolayer culture, A375 cells, EMT markers, N-cadherin, E-cadherin, vimentin, cortical actin, ZEB1, Slug, snails, Twist, TGF-β1, lysyl oxidase, cell invasion, metastasis, tumor cell differentiation
MeSH terms
Cell Culture Techniques, Three Dimensional, Cell Differentiation, Humans, Melanoma, Phenotype, Epithelial-Mesenchymal Transition

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