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Published on: March 18, 2014
Effects of caffeic acid phenethyl ester on cell death and survival pathways in human osteosarcoma cells
Bianca Leme1, Luis Francisco Borges da Silva1, Adriano de Souza Pessoa1
1Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, São Paulo, Brazil.
Abstract:
Osteosarcoma is the most common primary malignant bone tumour, accounting for approximately 20% of all primary bone tumours and about 5% of paediatric cancers. Due to therapeutic resistance and poor prognosis, novel treatment strategies are actively being explored, including natural compounds with antitumor potential. Caffeic acid phenethyl ester (CAPE), has attracted attention because of its antioxidant, anti-inflammatory, and antiproliferative properties. The present study investigated the effects of CAPE on cell death and survival pathways in human osteosarcoma cell lines (MG-63 and Saos-2) using MTT and RealTime-Glo viability assays, gene expression analysis by RT-qPCR, zymography, and qualitative hematoxylin-eosin staining and immunofluorescence. CAPE significantly reduced tumour cell viability, with IC50 values of 11.5 and 14.2 µM for MG-63 and Saos-2 cells, respectively, compared with 91.8 µM in normal cells. These effects were corroborated by morphological analyses, which revealed reduced cell density and marked structural alterations. CAPE positively modulated the expression of caspase pathway genes, BAX, and TIMP-1, while downregulating MMP-2 expression, thereby favouring a pro-apoptotic environment. In addition, zymography demonstrated reduced MMP-9 activity, a key enzyme involved in tumour invasion. Collectively, these findings highlight the promising antitumor potential of CAPE and support further investigations into its therapeutic applicability in osteosarcoma.
Insights
Caffeic acid phenethyl ester (CAPE) shows significant potential against osteosarcoma, a common bone cancer. This natural compound effectively reduced tumor cell viability and promoted cell death, indicating a promising therapeutic avenue.
Area of Science:
- Oncology
- Pharmacology
- Biochemistry
Background:
- Osteosarcoma is the most common primary bone tumor, often exhibiting therapeutic resistance and poor prognosis.
- Novel treatments, including natural compounds, are crucial for combating osteosarcoma.
- Caffeic acid phenethyl ester (CAPE) possesses known antioxidant, anti-inflammatory, and antiproliferative properties.
Purpose of the Study:
- To investigate the antitumor effects of CAPE on human osteosarcoma cell lines (MG-63 and Saos-2).
- To elucidate the impact of CAPE on cell death and survival pathways.
- To evaluate CAPE's therapeutic potential in osteosarcoma treatment.
Main Methods:
- Cell viability assays (MTT, RealTime-Glo) were performed.
- Gene expression was analyzed using RT-qPCR.
- Morphological changes were assessed via hematoxylin-eosin staining and immunofluorescence.
- Enzyme activity was measured by zymography.
Main Results:
- CAPE significantly reduced osteosarcoma cell viability with low IC50 values (11.5 µM for MG-63, 14.2 µM for Saos-2).
- Morphological analysis revealed decreased cell density and structural alterations.
- CAPE upregulated pro-apoptotic genes (caspase pathway, BAX, TIMP-1) and downregulated MMP-2.
- Zymography indicated reduced MMP-9 activity, suggesting decreased tumor invasion potential.
Conclusions:
- CAPE demonstrates significant antiproliferative and pro-apoptotic effects on osteosarcoma cells.
- CAPE modulates key genes and enzymes involved in cell survival and invasion.
- These findings support CAPE as a promising candidate for further investigation in osteosarcoma therapy.
