Limits...
Efficacy of Procyanidins against In Vivo Cellular Oxidative Damage: A Systematic Review and Meta-Analysis.

Li S, Xu M, Niu Q, Xu S, Ding Y, Yan Y, Guo S, Li F - PLoS ONE (2015)

Bottom Line: Statistically significant differences in the effects of PCs (P < 0.00001) were observed between these two methods.The effect of PCs on MDA was significantly greater in tissue samples than in serum samples (P = 0.02).The antagonistic effect may be related to intervention time, intervention method, and the source from which the indexes are estimated.

View Article: PubMed Central - PubMed

Affiliation: Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases (Ministry of Education), Shihezi University School of Medicine, Xinjiang, China.

ABSTRACT

Aims: In this study, the efficacy of proanthocyanidins (PCs) against oxidative damage was systematically reviewed to facilitate their use in various applications.

Methods: A meta-analysis was performed by two researchers. Each investigator independently searched electronic databases, including Cochrane, PubMed, Springer, Web of Science, China National Knowledge Infrastructure (CKNI), China Science and Technology Journal Database (CSTJ), and WanFang Data, and analyzed published data from 29 studies on the effects of PCs against oxidative damage. Oxidative stress indexes included superoxide dismutase (SOD), malondialdehyde (MDA), catalase (CAT), glutathione (GSH), glutathione peroxidase (GPx), and total antioxidative capacity (T-AOC).

Results: Compared with the oxidative damage model group, PCs effectively improved the T-AOC, SOD, GSH, GPx, and CAT levels, and reduced the MDA levels; these differences were statistically significant (P < 0.05). In studies that used the gavage method, SOD (95% CI, 2.33-4.00) and GPx (95% CI, 2.10-4.05) were 3.16-fold and 3.08-fold higher in the PC group than in the control group, respectively. In studies that used the feeding method, SOD (95% CI, 0.32-1.74) and GPx (95% CI, -0.31 to 1.65) were 1.03-fold and 0.67-fold higher in the PC group than in the control group, respectively. Statistically significant differences in the effects of PCs (P < 0.00001) were observed between these two methods. MDA estimated from tissue samples (95% CI, -5.82 to -2.60) was 4.32-fold lower in the PC group than in the control group. In contrast, MDA estimated using serum samples (95% CI, -4.07 to -2.06) was 3.06-fold lower in the PC group than in the control group. The effect of PCs on MDA was significantly greater in tissue samples than in serum samples (P = 0.02).

Conclusion: PCs effectively antagonize oxidative damage and enhance antioxidant capacity. The antagonistic effect may be related to intervention time, intervention method, and the source from which the indexes are estimated.

No MeSH data available.


Related in: MedlinePlus

Funnel plot for the studies that estimated SOD.Dotted line shows the overall estimated standard mean difference.The figure showed that the studies distributed symmetrically around the overall mean estimate.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4591260&req=5

pone.0139455.g010: Funnel plot for the studies that estimated SOD.Dotted line shows the overall estimated standard mean difference.The figure showed that the studies distributed symmetrically around the overall mean estimate.

Mentions: A sensitivity analysis was performed to evaluate the robustness of the study results. Specifically, we conducted a sensitivity analysis for SOD because it was estimated in 28 studies. Fig 9 shows the stability results for all studies; these results indicated that no individual study influenced the combined results. The method of intervention and the source of the outcome indicators (i.e., serum or tissue samples) significantly influenced the outcome indicators. A trend toward greater improvements was observed (Fig 8) when PC treatments were applied using the gavage method and when parameter estimates were based on tissue samples. The funnel plot for the studies that include estimates of SOD suggests that values were approximately evenly distributed around the overall mean estimate (Fig 10). Based on a multivariate meta-regression analysis, the source of outcome indicators (P = 0.040) and intervention method (P = 0.038) were significantly associated with differences in SOD.


Efficacy of Procyanidins against In Vivo Cellular Oxidative Damage: A Systematic Review and Meta-Analysis.

Li S, Xu M, Niu Q, Xu S, Ding Y, Yan Y, Guo S, Li F - PLoS ONE (2015)

Funnel plot for the studies that estimated SOD.Dotted line shows the overall estimated standard mean difference.The figure showed that the studies distributed symmetrically around the overall mean estimate.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4591260&req=5

pone.0139455.g010: Funnel plot for the studies that estimated SOD.Dotted line shows the overall estimated standard mean difference.The figure showed that the studies distributed symmetrically around the overall mean estimate.
Mentions: A sensitivity analysis was performed to evaluate the robustness of the study results. Specifically, we conducted a sensitivity analysis for SOD because it was estimated in 28 studies. Fig 9 shows the stability results for all studies; these results indicated that no individual study influenced the combined results. The method of intervention and the source of the outcome indicators (i.e., serum or tissue samples) significantly influenced the outcome indicators. A trend toward greater improvements was observed (Fig 8) when PC treatments were applied using the gavage method and when parameter estimates were based on tissue samples. The funnel plot for the studies that include estimates of SOD suggests that values were approximately evenly distributed around the overall mean estimate (Fig 10). Based on a multivariate meta-regression analysis, the source of outcome indicators (P = 0.040) and intervention method (P = 0.038) were significantly associated with differences in SOD.

Bottom Line: Statistically significant differences in the effects of PCs (P < 0.00001) were observed between these two methods.The effect of PCs on MDA was significantly greater in tissue samples than in serum samples (P = 0.02).The antagonistic effect may be related to intervention time, intervention method, and the source from which the indexes are estimated.

View Article: PubMed Central - PubMed

Affiliation: Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases (Ministry of Education), Shihezi University School of Medicine, Xinjiang, China.

ABSTRACT

Aims: In this study, the efficacy of proanthocyanidins (PCs) against oxidative damage was systematically reviewed to facilitate their use in various applications.

Methods: A meta-analysis was performed by two researchers. Each investigator independently searched electronic databases, including Cochrane, PubMed, Springer, Web of Science, China National Knowledge Infrastructure (CKNI), China Science and Technology Journal Database (CSTJ), and WanFang Data, and analyzed published data from 29 studies on the effects of PCs against oxidative damage. Oxidative stress indexes included superoxide dismutase (SOD), malondialdehyde (MDA), catalase (CAT), glutathione (GSH), glutathione peroxidase (GPx), and total antioxidative capacity (T-AOC).

Results: Compared with the oxidative damage model group, PCs effectively improved the T-AOC, SOD, GSH, GPx, and CAT levels, and reduced the MDA levels; these differences were statistically significant (P < 0.05). In studies that used the gavage method, SOD (95% CI, 2.33-4.00) and GPx (95% CI, 2.10-4.05) were 3.16-fold and 3.08-fold higher in the PC group than in the control group, respectively. In studies that used the feeding method, SOD (95% CI, 0.32-1.74) and GPx (95% CI, -0.31 to 1.65) were 1.03-fold and 0.67-fold higher in the PC group than in the control group, respectively. Statistically significant differences in the effects of PCs (P < 0.00001) were observed between these two methods. MDA estimated from tissue samples (95% CI, -5.82 to -2.60) was 4.32-fold lower in the PC group than in the control group. In contrast, MDA estimated using serum samples (95% CI, -4.07 to -2.06) was 3.06-fold lower in the PC group than in the control group. The effect of PCs on MDA was significantly greater in tissue samples than in serum samples (P = 0.02).

Conclusion: PCs effectively antagonize oxidative damage and enhance antioxidant capacity. The antagonistic effect may be related to intervention time, intervention method, and the source from which the indexes are estimated.

No MeSH data available.


Related in: MedlinePlus