Glutathione S-transferase M1 and T1 gene polymorphisms with consumption of high fruit-juice and vegetable diet affect antioxidant capacity in healthy adults.
Nutrition 2013;
29:965-71. [PMID:
23422534 DOI:
10.1016/j.nut.2012.12.025]
[Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2012] [Revised: 11/15/2012] [Accepted: 12/20/2012] [Indexed: 12/19/2022]
Abstract
OBJECTIVE
To our knowledge, no data have yet shown the combined effects of GSTM1/GSTT1 gene polymorphisms with high consumption of a fruit and vegetable diet on the body's antioxidant capacity. A 2-wk dietary intervention in healthy participants was conducted to test the hypothesis that the antioxidant biomarkers in individuals with different glutathione-S-transferases (GST) genotypes will be different in response to a high fruit-juice and vegetable diet.
METHODS
In our study, 24 healthy volunteers with different GST genotypes (12 GSTM1+/GSTT1+ and 12 GSTM1-/GSTT1- participants) consumed a controlled diet high in fruit-juice and vegetables for 2 wk. Blood and first-void urine specimens were obtained at baseline, 1-wk, and 2-wk intervals. The antioxidant capacity-related biomarkers in blood and urine were observed and recorded at the scheduled times.
RESULTS
Erythrocyte GST and glutathione reductase (GR) activities response to a high fruit-juice and vegetable diet are GST genotype-dependent. Two weeks on the high fruit-juice and vegetable diet increased GST and GR activities in the GSTM1+/GSTT1+ group (P < 0.05 compared with baseline or GSTM1-/GSTT1- group), although no effects were observed on GST and GR activities in GSTM1-/GSTT1- participants. Dietary intervention increased total antioxidant capacity and decreased plasma malondialdehyde content in all participants (P < 0.05 compared with baseline), whereas GSTM1+/GSTT1+ participants respond more quickly to a high fruit-juice and vegetable diet than GSTM1-/GSTT1- participants. The diet intervention was effective in enhancing glutathione peroxidase and catalase activities in all participants (P < 0.05 compared with baseline), although there was no influence on erythrocyte superoxide dismutase activity (P > 0.05).
CONCLUSION
The effects of a diet rich in fruit-juice and vegetables on antioxidant capacity were dependent on GSTM1/GSTT1 genotypes.
Collapse