Claudia Sánchez-González1, Carlos J Ciudad2, Maria Izquierdo-Pulido1,3, Véronique Noé4. 1. Nutrition and Food Science Department, University of Barcelona, 08028, Barcelona, Spain. 2. Biochemistry and Molecular Biology Department, School of Pharmacy, University of Barcelona, Av. Joan XXIII s/n, 08028, Barcelona, Spain. cciudad@ub.edu. 3. CIBER Fisiopatología de la Obesidad y la Nutrición (CIBEROBN), Barcelona, Spain. 4. Biochemistry and Molecular Biology Department, School of Pharmacy, University of Barcelona, Av. Joan XXIII s/n, 08028, Barcelona, Spain.
Abstract
PURPOSE: Walnuts contain several bioactive compounds, including pedunculagin, a polyphenol metabolized by microbiota to form urolithins, namely urolithin A (UA). The aim of this study was to determine gene expression changes in prostate cancer cells after incubation with UA. METHODS: We performed a genomic analysis to study the effect of UA on LNCaP prostate cells. Cells were incubated with 40 µM UA for 24 h, and RNA was extracted and hybridized to Affymetrix Human Genome U219 array. Microarray results were analyzed using GeneSpring v13 software. Differentially expressed genes (p < 0.05, fold change > 2) were used to perform biological association networks. Cell cycle was analyzed by flow cytometry and apoptosis measured by the rhodamine method and by caspases 3 and 7 activation. Cell viability was determined by MTT assay. RESULTS: We identified two nodes, FN-1 and CDKN1A, among the differentially expressed genes upon UA treatment. CDKN1A was validated, its mRNA and protein levels were significantly up-regulated, and the promoter activation measured by luciferase. Cell cycle analysis showed an increase in G1-phase, and we also observed an induction of apoptosis and caspases 3 and 7 activation upon UA treatment. CONCLUSION: Our results indicate a potential role of UA as a chemopreventive agent for prostate cancer.
PURPOSE: Walnuts contain several bioactive compounds, including pedunculagin, a polyphenol metabolized by microbiota to form urolithins, namely urolithin A (UA). The aim of this study was to determine gene expression changes in prostate cancer cells after incubation with UA. METHODS: We performed a genomic analysis to study the effect of UA on LNCaP prostate cells. Cells were incubated with 40 µM UA for 24 h, and RNA was extracted and hybridized to Affymetrix Human Genome U219 array. Microarray results were analyzed using GeneSpring v13 software. Differentially expressed genes (p < 0.05, fold change > 2) were used to perform biological association networks. Cell cycle was analyzed by flow cytometry and apoptosis measured by the rhodamine method and by caspases 3 and 7 activation. Cell viability was determined by MTT assay. RESULTS: We identified two nodes, FN-1 and CDKN1A, among the differentially expressed genes upon UA treatment. CDKN1A was validated, its mRNA and protein levels were significantly up-regulated, and the promoter activation measured by luciferase. Cell cycle analysis showed an increase in G1-phase, and we also observed an induction of apoptosis and caspases 3 and 7 activation upon UA treatment. CONCLUSION: Our results indicate a potential role of UA as a chemopreventive agent for prostate cancer.
Entities:
Keywords:
Ellagitannins cancer prevention; Urolithin A; Walnuts
Authors: Arshi Malik; Farrukh Afaq; Sami Sarfaraz; Vaqar M Adhami; Deeba N Syed; Hasan Mukhtar Journal: Proc Natl Acad Sci U S A Date: 2005-09-28 Impact factor: 11.205