Abstract
Background
The pivotal role of oxidative stress and inflammation in the pathophysiology of type 2 diabetes mellitus (T2DM) has been firmly established. However, the evidence concerning hypoglycaemic medicinal plants' antioxidant and anti-inflammatory effects remains inconclusive due to inconsistencies in prior studies. To address this gap, our study aims to perform a comprehensive systematic review and meta-analysis of randomized controlled trials (RCTs) to consolidate previous research findings in this field.
Methods
We conducted a comprehensive search in the PubMed, Web of Science, Embase, Cochrane Library, and Scopus databases to identify relevant English randomized controlled trials (RCTs). Our study adhered to the Preferred Reporting Items for Systematic Review and Meta-analysis (PRISMA) guidelines. All eligible studies that evaluated concurrently the antioxidative and anti-inflammatory effects of hypoglycaemic plant-derived supplements on type 2 diabetes mellitus (T2DM) were included in the meta-analysis. The meta-analysis itself was carried out using both fixed and random effects models to synthesize the findings from the selected studies.
Results
Our study included 47 trials with a total of 2636 participants, both male and female, aged between 20 and 79 years, diagnosed with prediabetes, type 2 diabetes mellitus (T2DM), or metabolic syndrome. The meta-analysis revealed that plant-derived treatments, compared to placebos or other medicines, significantly improved oxidative stress (SMD = − 0.36, 95% CI − 0.64 to − 0.09), inflammation (SMD = − 0.47, 95% CI − 0.63 to − 0.31), total antioxidant capacity (SMD = 0.46, 95% CI 0.16–0.75), and antioxidant enzyme activity (SMD = 1.80, 95% CI 1.26–2.33). The meta-regression analysis showed that treatment duration exceeding 8 weeks significantly impacted the heterogeneity of the oxidative stress data.
Conclusions
Several hypoglycaemic plant-based treatments appear to positively affect T2DM patients by concurrently lowering oxidative stress and inflammatory indicators and boosting antioxidant enzyme activity.
Clinical Trail Registry
PROSPERO ID: CRD42021226147.
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Data availability
The data supporting this study's findings are available from the corresponding author upon reasonable request.
Abbreviations
- Akt:
-
Protein kinase B
- CAT:
-
Catalase
- CI:
-
Confidence interval
- DBRCT:
-
Double-blind, randomized controlled trial
- GPx:
-
Glutathione peroxidase
- GSH:
-
Reduced glutathione
- hs-CRP:
-
High-sensitivity C-reactive protein
- IL-6:
-
Interleukin-6
- MD:
-
Mean difference
- MDA:
-
Malondialdehyde
- NF-κB:
-
Nuclear factor kappa light chain-enhancer of activated B cells
- NO:
-
Nitric oxide
- Nrf2:
-
Nuclear factor erythroid 2-related factor 2
- PI3K:
-
Phosphatidyl inositol-3-kinase
- PRISMA:
-
Preferred reporting items for systematic reviews and meta-analyses
- PROSPERO:
-
International Prospective Register of Systematic Reviews
- SD:
-
Standard deviation
- SE:
-
Standard error
- SIRT:
-
Sirtuin 3
- SMD:
-
Standardized mean difference
- SOD:
-
Superoxide dismutase
- T2DM:
-
Type 2 diabetes mellitus
- TAC:
-
Total antioxidant capacity
- TNF-α:
-
Tumor necrosis factor-α
- WHO:
-
World Health Organization
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Acknowledgements
All authors thank Endocrinology and Metabolism Clinical Sciences Institute for its financial support. It should be noted that the institute had no role in any part of the study, writing of the manuscript, or the decision to submit.
Funding
This work was supported by the Diabetes Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran [Grant IDs 1399-01-97-991].
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OT-M: supervision, data curation, methodology, validation, writing, reviewing, and editing; BA and SM: methodology, data curation, writing—original draft preparation; FE: methodology, data curation, reviewing and editing; MQ: methodology, validation, reviewing and editing; MK, EN, ZN: data curation, reviewing, and editing.
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Supplementary file2 Table S2. Subgroup analyses for the effects of herbal medicines on the primary and secondary outcomes (DOCX 16 KB)
10787_2023_1315_MOESM4_ESM.docx
Supplementary file4 Fig. S2 Forest plot of antioxidative enzymes’ activity in the random effect meta-analysis (DOCX 97 KB)
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Azizi, B., Mohseni, S., Tabatabaei-Malazy, O. et al. Meta-analysis of the anti-oxidative and anti-inflammatory effects of hypoglycaemic plant-derived medicines. Inflammopharmacol 31, 2521–2539 (2023). https://doi.org/10.1007/s10787-023-01315-9
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DOI: https://doi.org/10.1007/s10787-023-01315-9