The interaction between dietary Non-Enzymatic Antioxidant Capacity (NEAC) with variants of Melanocortin-4 receptor (MC4R) 18q21.23-rs17782313 locus on hypothalamic hormones and cardio-metabolic risk factors in obese individuals from Iran

ABSTRACT

Background: In the current study, we aimed to evaluate the interaction between dietary Non-Enzymatic Antioxidant Capacity (NEAC) and rs17782313 polymorphism on hypothalamic hormones and cardio-metabolic risk factors.

Methods: A total of 287 subjects (aged 20–50 years, 147 males and 140 females) enrolled in the cross-sectional study. Dietary NEAC was assessed using databases of NEAC measurements compiled from outcomes for three different analyses: oxygen radical absorbance capacity (ORAC), ferric reducing-antioxidant power (FRAP), and total radical-trapping antioxidant parameter (TRAP) and genotyping for the near MC4R rs17782313 was carried out by Polymerase chain reaction-restriction fragments length polymorphism (PCR-RFLP) method.

Results: The significant interactions were found between adherence to the dietary NEAC and MC4R rs17782313 in relation to high-density lipoprotein-cholesterol (HDL-C), glucose, α-melanocyte stimulating hormone (α-MSH), insulin and quantitative insulin sensitivity check index (QUICKI) (P_Interaction = 0.03, 0.01, 0.04, 0.04 and 0.04, respectively). In homozygous subjects for the minor allele, the serum insulin level and QUICKI in participants with the highest adherence to TRAP were significantly higher than those with the lowest adherence (p < 0.001). There was a significant inverse association between high ORAC score and risk of metabolic syndrome even after adjusting for potential confounders (OR: 0.33; 95%CI:0.13–0.81) and also a significant inverse association between high NEAC (ORAC, FRAP and TRAP assays) score and high triglyceride (TG) level was found in obese adults.

Conclusion: In conclusion, our study found for the first time that the NEAC significantly interacts with the rs17782313 genotypes to influence several metabolic risk factors in obesity.

KEYWORDS:

• Obesity
• antioxidants
• oxidative stress
• gene-diet interaction
• polymorphism
• TAC
• metabolic factors
• Melanocortin-4 receptor‌

Acknowledgements

We thank all of the study participants. We also are thankful from the Research Undersecretary of Tabriz University of Medical Sciences for financial support of the current work. All authors have read and approved the manuscript; MM, collected the data, wrote the first draft of the manuscript. MAF designed the project, supervised the project. HK was also involved in lab works and genetic assays. MKH was involved in data collection and analysis, genetic assay and also she drafted and revised the manuscript. MV also contributed to manuscript drafting.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Declarations

Ethical approval and consent to participate: The data of the current study has been extracted from two registered protocol of the Tabriz University of Medical Sciences and their protocol has been approved by research undersecretary of Tabriz University of Medical Sciences (identifier: IR.TBZMED.REC.1397.237 and IR.TBZMED.REC.1399.208). The work is obtained from M.S. thesis of Mohaddeseh Mohammadi.

Consent to publish: Not applicable.

Availability of data and materials: All of the data are available with reasonable request from the corresponding author.

Additional information

Funding

This work has been supported by a grant from undersecretary of Tabriz University of Medical Sciences (identifier: IR.TBZMED.REC.1397.237 and IR.TBZMED.REC.1399.208).