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Effect of Diosgenin in Suppressing Viability and Promoting Apoptosis of Human Prostate Cancer Cells: An Interplay with the G Protein-Coupled Oestrogen Receptor?

Publication . Figueira, Marília I; Marques, Ricardo; Cardoso, Henrique J.; Fonseca, Lara R. S.; Duarte, Ana Paula; Silvestre, Samuel; Socorro, Sílvia

Diosgenin is a phytosteroid sapogenin with reported antitumoral activity. Despite the evidence indicating a lower incidence of prostate cancer (PCa) associated with a higher consumption of phytosteroids and the beneficial role of these compounds, only a few studies have investigated the effects of diosgenin in PCa, and its mechanisms of action remain to be disclosed. The present study investigated the effect of diosgenin in modulating PCa cell fate and glycolytic metabolism and explored its potential interplay with G protein-coupled oestrogen receptor (GPER). Non-neoplastic (PNT1A) and neoplastic (LNCaP, DU145, and PC3) human prostate cell lines were stimulated with diosgenin in the presence or absence of the GPER agonist G1 and upon GPER knockdown. Diosgenin decreased the cell viability, as indicated by the MTT assay results, which also demonstrated that castrate-resistant PCa cells were the most sensitive to treatment (PC3 > DU145 > LNCaP > PNT1A; IC50 values of 14.02, 23.21, 56.12, and 66.10 µM, respectively). Apoptosis was enhanced in diosgenin-treated cells, based on the increased caspase-3-like activity, underpinned by the altered expression of apoptosis regulators evaluated by Western blot analysis, which indicated the activation of the extrinsic pathway. Exposure to diosgenin also altered glucose metabolism. Overall, the effects of diosgenin were potentiated in the presence of G1. Moreover, diosgenin treatment augmented GPER expression, and the knockdown of the GPER gene suppressed the proapoptotic effects of diosgenin in PC3 cells. Our results support the antitumorigenic role of diosgenin and its interest in PCa therapy, alone or in combination with G1, mainly targeting the more aggressive stages of the disease.

2024-11-08Journal article

Open access

Downregulated Regucalcin Expression Induces a Cancer-like Phenotype in Non-Neoplastic Prostate Cells and Augments the Aggressiveness of Prostate Cancer Cells: Interplay with the G Protein-Coupled Oestrogen Receptor?

Publication . Fonseca, Lara R. S.; Carreira, Ricardo J. P.; Feijó, Mariana; Cavaco, J. E.; Cardoso, Henrique; Vaz, C. V.; Figueira, Marília I.; Socorro, Sílvia

Background/objectives: Regucalcin (RGN) is a calcium-binding protein and an oestrogen target gene, which has been shown to play essential roles beyond calcium homeostasis. Decreased RGN expression was identified in several cancers, including prostate cancer (PCa). However, it is unknown if the loss of RGN is a cause or a consequence of malignancy. Also, it needs confirmation if RGN oestrogenic regulation occurs through the G-protein-coupled oestrogen receptor (GPER). This study investigates how RGN knockdown affects prostate cell fate and metabolism and highlights the GPER/RGN interplay in PCa. Methods: Bioinformatic analysis assessed the relationship between RGN expression levels and patients' outcomes. RGN knockdown (siRNA) was performed in non-neoplastic prostate and castration-resistant PCa. Wild-type and RGN knockdown PCa cells were treated with the GPER agonist G1. Viability (MTT), proliferation (Ki-67 immunocytochemistry), apoptosis (caspase-3-like activity) and migration (Transwell assays) were evaluated. Spectrophotometric analysis was used to determine glucose consumption, lactate production and lactate dehydrogenase activity. Lipid content was assessed using the Oil Red assay. Results/conclusions: Bioinformatic analysis showed that the loss of RGN correlates with the development of metastatic PCa and poor survival outcomes. RGN knockdown induced a cancer-like phenotype in PNT1A cells, indicated by increased cell viability and proliferation and reduced apoptosis. In DU145 PCa cells, RGN knockdown augmented migration and enhanced the glycolytic profile, which indicates increased aggressiveness, in line with patients' data. GPER activation modulated RGN expression in PCa cells and RGN knockdown in DU145 cells influenced GPER actions, which highlighted an interplay between these molecular players with relevance for their potential use as biomarkers or therapeutic targets.

2024-11-24Journal article

Open access

Characterization and evaluation of Achillea erba-rotta subsp. moschata (Wulfen) I. Richardson and Achillea millefolium L. as potential ingredients for skin applications

Publication . Marengo, Arianna; Cagliero, Cecilia; Sgorbini, Barbara; Menzio, Giulia ; Fusani, Pietro; Duarte, Ana Paula; Luís, Ângelo Filipe Santos ; Fonseca, Lara R. S.; Feijó, Mariana Pombal ; Socorro, Sílvia; Bertea, Cinzia Margherita; Rubiolo, Patrizia

Ethnopharmacological relevance: Despite their different geographical distribution Achillea millefolium L. and Achillea erba-rotta subsp. moschata (Wulfen) I. Richardson are characterized by a consolidated traditional knowledge. Although this is not their first traditional use, they have also long been used as ingredients for skin healing and skin care. Aim of the study: The aim of this work was to characterize the two Achillea species from a chemical and biomolecular point of view in order to find a simple tool for their discrimination. At the same time, the biological activity of the extracts as inhibitors of the enzymes tyrosinase and elastase and as antimicrobial agents was evaluated. Materials and methods: The biomolecular analysis was performed on the DNA region trnL-F. The hydroalcholic (EtOH50 %) extracts were quali-quantitatively characterized by HPLC-PDA-MS/MS and tested for their inhibitory effect on the enzymes tyrosinase and elastase as well as for their antimicrobial activity. Cytotoxicity towards human fibroblasts was tested to evaluate their safety for potential applications. Results: Restriction Fragment Length Polymorphism (RFLP) analysis of the trnL-F DNA region was a useful tool for species discrimination. Both extracts are rich in polyphenols and showed moderate tyrosinase (26-5 %) and elastase (22-14 %) inhibitory activity at 17 μg/mL. They were also able to inhibit the growth of the bacteria and yeasts studied, generally exhibiting cytotoxicity to human fibroblasts at concentrations of 500 μg/mL or higher. Conclusions: The hydroalcoholic extracts from the aerial parts of A. millefolium and A. erba-rotta subsp. moschata can be considered good candidates for the cosmetic and health sectors, also supporting the traditional use of these species in the treatment of skin diseases.

2025-06-09Journal article

Restricted access