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The effects of coenzyme Q10 administration on glucose homeostasis parameters, lipid profiles, biomarkers of inflammation and oxidative stress in patients with metabolic syndrome

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16 April 2020 The Editor-in-Chief is currently investigating this article [Raygan, F., Rezavandi, Z., Dadkhah Tehrani, S. et al. The effects of coenzyme Q10 administration on glucose homeostasis parameters, lipid profiles, biomarkers of inflammation and oxidative stress in patients with metabolic syndrome. Eur J Nutr 55, 2357–2364 (2016). https://doi.org/10.1007/s00394-015-1042-7] as concerns have been raised about integrity of the clinical trial reported here. There is also an ongoing investigation by the Iranian National Committee for Ethics in Biomedical Researches. Further editorial action will be taken as appropriate once the investigation into the concerns is complete and all parties have been given an opportunity to respond in full.

Abstract

Background

Limited data are available indicating the effects of coenzyme Q10 (CoQ10) supplementation on metabolic status of patients with metabolic syndrome (MetS).

Purpose

The present study was conducted to determine the effects of CoQ10 administration on glucose homeostasis parameters, lipid profiles, biomarkers of inflammation and oxidative stress among patients with MetS.

Methods

This randomized, double-blind, placebo-controlled trial was performed among 60 overweight or obese and type 2 diabetes mellitus patients with coronary heart disease aged 40–85 years old. Participants were randomly allocated into two groups. Group A (n = 30) received 100 mg CoQ10 supplements and group B (n = 30) received placebo for 8 weeks. Fasting blood samples were taken at the beginning of the study and after 8-week intervention to quantify glucose homeostasis parameters, lipid profiles and biomarkers of inflammation and oxidative stress.

Results

Compared with the placebo, CoQ10 supplementation resulted in a significant reduction in serum insulin levels (−2.1 ± 7.1 vs. +4.1 ± 7.8 µIU/mL, P = 0.002) and homeostasis model of assessment-insulin resistance (−0.7 ± 2.1 vs. +1.0 ± 2.0, P = 0.002) and homeostatic model assessment-beta cell function (−5.9 ± 22.2 vs. +15.9 ± 34.0, P = 0.005). In addition, patients who received CoQ10 supplements had a significant increase in plasma total antioxidant capacity (TAC) concentrations (+26.0 ± 105.0 vs. −162.2 ± 361.8 mmol/L, P = 0.008) compared with the placebo group. However, after adjustment for the baseline levels, age and baseline BMI, the effect on TAC levels (P = 0.08) disappeared. Additionally, compared with the placebo group, a significant positive trends in plasma glutathione (P = 0.06) and a significant reduction in malondialdehyde (P = 0.08) were seen among patients who received CoQ10 supplement. We did not observe any significant changes in fasting plasma glucose, lipid concentrations and inflammatory markers.

Conclusions

Overall, daily intake of 100 mg CoQ10 supplements among patients with MetS for 8 weeks had beneficial effects on serum insulin levels, HOMA-IR, HOMA-B and plasma TAC concentrations.

Clinical trial registration number

www.irct.ir: IRCT201502245623N35.

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Change history

  • 16 April 2020

    The Editor-in-Chief is currently investigating this article [Raygan, F., Rezavandi, Z., Dadkhah Tehrani, S. et al. The effects of coenzyme Q10 administration on glucose homeostasis parameters, lipid profiles, biomarkers of inflammation and oxidative stress in patients with metabolic syndrome. Eur J Nutr 55, 2357–2364 (2016). https://doi.org/10.1007/s00394-015-1042-7] as concerns have been raised about integrity of the clinical trial reported here. There is also an ongoing investigation by the Iranian National Committee for Ethics in Biomedical Researches. Further editorial action will be taken as appropriate once the investigation into the concerns is complete and all parties have been given an opportunity to respond in full.

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Acknowledgments

The current study was founded by a grant from the Vice-chancellor for Research, KUMS, Iran. The authors would like to thank the staff of Naghavi Clinic (Kashan, Iran) for their assistance in this project.

Authors’ contributions

Z.A. contributed in conception, design, statistical analysis and drafting of the manuscript. F.R., Z.R., S.D. and A.F. contributed in data collection and manuscript drafting. All authors approved the final version for submission. Z.A. supervised the study. All authors approved the final version for submission.

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Authors and Affiliations

  1. Department of Cardiology, School of Medicine, Kashan University of Medical Sciences, Kashan, Iran

    Fariba Raygan, Zohreh Rezavandi & Alireza Farrokhian

  2. Research Center for Biochemistry and Nutrition in Metabolic Diseases, Kashan University of Medical Sciences, Kashan, Iran

    Sahar Dadkhah Tehrani & Zatollah Asemi

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  1. Fariba Raygan
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  2. Zohreh Rezavandi
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Correspondence to Zatollah Asemi.

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Raygan, F., Rezavandi, Z., Dadkhah Tehrani, S. et al. The effects of coenzyme Q10 administration on glucose homeostasis parameters, lipid profiles, biomarkers of inflammation and oxidative stress in patients with metabolic syndrome. Eur J Nutr 55, 2357–2364 (2016). https://doi.org/10.1007/s00394-015-1042-7

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