To date, no intervention studies have been published demonstrating the effect of the antioxidant lycopene on bone. Postmenopausal women supplemented with lycopene had significantly increased antioxidant capacity and decreased oxidative stress and the bone resorption marker N-telopeptide (NTx). Lycopene decreases bone resorption markers and may reduce the risk of osteoporosis.
We have previously shown in vitro and in vivo that lycopene from tomato is associated with a protective effect on bone, but lycopene intervention studies have not been reported. Our aim was to carry out a randomized controlled intervention study to determine whether lycopene would act as an antioxidant to decrease oxidative stress parameters, resulting in decreased bone turnover markers, thus reducing the risk of osteoporosis in postmenopausal women.
Sixty postmenopausal women, 50–60 years old, were recruited. Following a 1-month washout without lycopene consumption, participants consumed either (N = 15/group): (1) regular tomato juice, (2) lycopene-rich tomato juice, (3) tomato Lyc-O-Mato® lycopene capsules, or (4) placebo capsules, twice daily for total lycopene intakes of 30, 70, 30, and 0 mg/day respectively for 4 months. Serum collected after the washout, 2 and 4 months of supplementation, was assayed for cross-linked aminoterminal N-telopeptide, carotenoid content, total antioxidant capacity (TAC), lipid, and protein oxidation.
Participants who consumed juice or lycopene capsules were analyzed in one group designated “LYCOPENE-supplemented”. Repeated measures ANOVA showed that LYCOPENE-supplementation for 4 months significantly increased serum lycopene compared to placebo (p < 0.001). LYCOPENE-supplementation for 4 months resulted in significantly increased TAC (p < 0.05) and decreased lipid peroxidation (p < 0.001), protein oxidation (p < 0.001), and NTx (p < 0.001). These decreases in lipid peroxidation, protein oxidation, and NTx were significantly different from the corresponding changes resulting from placebo supplementation (p < 0.05, p < 0.005, and p < 0.02, respectively).
Our findings suggest that the antioxidant lycopene is beneficial in reducing oxidative stress parameters and the bone resorption marker NTx.
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Funding is shared by the Canadian Institutes of Health Research (CIHR) and the Research and Development Departments of Genuine Health Inc., the H.J. Heinz Co, Millenium Biologix Inc. (Canada), Kagome Co. (Japan), and LycoRed, Ltd. Israel. We especially thank Dr. Z. Liu for processing the extracted carotenoid samples and determining the carotenoid content using the HPLC software. We gratefully acknowledge: Amy Strauss, Dr. C Derzko, and Karl BruckMueller, for allowing us access to their list of patients who had signed consent forms indicating interest in studies related to bone health. A special thank you to the following students for their assistance with participant recruitment: A. Dias, T. Huang, M. Maksimowski, M. Simms, and K. Zarudny, and S. Ho for assistance with the dietary analysis.
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Mackinnon, E.S., Rao, A.V., Josse, R.G. et al. Supplementation with the antioxidant lycopene significantly decreases oxidative stress parameters and the bone resorption marker N-telopeptide of type I collagen in postmenopausal women. Osteoporos Int 22, 1091–1101 (2011). https://doi.org/10.1007/s00198-010-1308-0
- Bone resorption
- Oxidative stress