Abstract B80: Beneficial regulation of metabolic profiles by black raspberries in human colorectal cancer patients

Abstract

Abstract Objectives: Dietary intervention of freeze-dried black raspberries (BRBs) in a group of human colorectal cancer patients has demonstrated beneficial effects, including pro-apoptosis, anti-proliferation and anti-angiogenesis. The aim of this study was to investigate BRB-mediated metabolite changes from this same cohort of patients. Methods: 28 colorectal cancer patients were given 60 g BRB powder daily for 1-9 weeks. Urine and plasma specimens were collected before and after BRB intervention. A comprehensive mass spectrometry-based nontargeted metabolomic analysis was conducted on each specimen. Results: A total of more than 400 metabolites were annotated in each specimen. Of these 69 and 58 metabolites were significantly changed by BRBs in urine and plasma, respectively. An increased level of 4-methylcatechol sulfate was correlated with a higher apoptotic marker (TUNEL) in post-BRB tumors, while a decreased level of N-acetylglycine was correlated with a lower cell proliferation marker (Ki67) in post-BRB tumors. Cis-aconitate and isocitrate, two tricarboxylic acid (TCA) cycle metabolites, were increased in post-BRB urine. Fatty acid β-oxidation and synthesis were decreased in post-BRB plasma. In addition, BRB-derived polyphenols were absorbed and metabolized to various benzoate species, which were significantly increased in post-BRB specimens. Increased benzoate levels were positively correlated with enhanced amino acid and carbohydrate metabolism but were negatively correlated with decreased fatty acid metabolism. Conclusion: These results suggest that BRBs may induce systemic changes that affect energy generating pathways. This study supports the hypothesis that BRBs might be beneficial to colorectal cancer patients through altering multiple intrinsic metabolic pathways. Citation Format: Pan Pan, Chad W. Skaer, Steven M. Stirdivant, Matthew R. Young, Gary D. Stoner, John F. Lechner, Yi-Wen Huang, Li-Shu Wang. Beneficial regulation of metabolic profiles by black raspberries in human colorectal cancer patients. [abstract]. In: Proceedings of the AACR Special Conference: Metabolism and Cancer; Jun 7-10, 2015; Bellevue, WA. Philadelphia (PA): AACR; Mol Cancer Res 2016;14(1_Suppl):Abstract nr B80.