Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/223486
Title: Regulatory Mechanisms of SPARC Overexpression in Melanoma Progression
Author: Vinyals, Antònia
Ferreres Riera, Jose Ramon
Campos Martín, Rafael
Jorge Torres, Olga C.
Mainez Villoro, Jessica
Puig Butillé, Joan Anton
Marcoval Caus, Joaquim
Puig i Sardà, Susana
Fabregat Romero, Isabel
Fabra Fres, Àngels
Keywords: Melanoma
Oncogens
Metàstasi
Melanoma
Oncogenes
Metastasis
Issue Date: 8-Sep-2025
Publisher: MDPI
Abstract: The expression of the Secreted Protein, Acidic and Rich in Cysteine (SPARC) gene in human melanoma increases during progression and is associated with epithelial-to-mesenchymal transition (EMT), which is a major determinant of metastasis in melanoma patients. However, the underlying molecular mechanisms that control SPARC expression in this context remain elusive. Herein, we identified Paired-related homeobox 1 (PRRX1), an EMT transcription factor, as a transcriptional activator of SPARC by direct binding to the promoter, thereby increasing its activity. Moreover, we found a strong positive correlation between SPARC and PRRX1 expression levels in clinical samples and cell lines. Furthermore, the switch from the proliferative/melanocytic phenotype toward the invasive/mesenchymal-like phenotype favors the expression of TCF7L2, a beta-catenin cofactor, which, together with Sp1, binds to the proximal SPARC promoter, thereby bolstering protein expression. We also show that SPARC is a target of the miR-29 family, whose members are expressed in clinical melanoma samples and cell lines. Indeed, we found that miR-29b1 similar to a expression is inversely correlated with SPARC levels, and it is significantly reduced in samples with a mesenchymal-like phenotype. Taken together, SPARC expression in melanoma cells relies on transcriptional activation by PRRX1/TCF7L2-Sp1 and is modulated through miR-29b1 similar to a, which provides fine-tuning regulation over the switch between phenotypic states.
Note: Reproducció del document publicat a: https://doi.org/10.3390/ijms26178743
It is part of: International Journal of Molecular Sciences, 2025, vol. 26, num. 17, 8743
URI: https://hdl.handle.net/2445/223486
Related resource: https://doi.org/10.3390/ijms26178743
ISSN: 1422-0067
Appears in Collections:Articles publicats en revistes (Institut d'lnvestigació Biomèdica de Bellvitge (IDIBELL))
Articles publicats en revistes (Institut de Recerca Biomèdica (IRB Barcelona))
Articles publicats en revistes (IDIBAPS: Institut d'investigacions Biomèdiques August Pi i Sunyer)

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