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The journal of nutrition, health & aging

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04.10.2023 | Original Research

High Dietary Zinc Intake Is Associated with Shorter Leukocyte Telomere Length, Mediated by Tumor Necrosis Factor-α: A Study of China Adults

verfasst von: B. Xing, J. Yu, Y. Liu, S. He, X. Chen, Z. Li, L. He, N. Yang, F. Ping, L. Xu, Wei Li, Huabing Zhang, Yuxiu Li

Erschienen in: The journal of nutrition, health & aging | Ausgabe 10/2023

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Abstract

Objectives

Diet can influence peripheral leukocyte telomere length (LTL), and various micronutrients have been reported to correlate with it. Zinc is known for its antioxidant properties and immunomodulatory effects. However, there are few epidemiological investigations on the relationship between dietary zinc intake and LTL. This study analyzed the association between dietary zinc and LTL and the potential role of inflammation and oxidative stress among them.

Design

Cross-sectional and community-based study.

Setting and Participants

599 participants from rural communities in the Changping suburb of Beijing, China, were recruited.

Measurements

Serum lipid profile, glycosylated hemoglobin (HbA1c), oxidative stress marker, and inflammatory cytokines levels were measured. Detailed dietary data were obtained using a 24 h food recall. LTL was assessed using a real-time PCR assay. Spearman analysis, restricted cubic splines (RCS), and general linear regression models were used to determine the association between dietary zinc intake and LTL. Simple regulatory models were also applied to analyze the role of inflammation and oxidative stress among them.

Results

A total of 482 subjects were ultimately included in this analysis. Spearman analysis showed that dietary zinc intake and zinc intake under energy density were negatively correlated with LTL (r=−0.142 and −0.126, all P <0.05) and positively correlated with tumor necrosis factor-α (TNF-α) (r=0.138 and 0.202, all P <0.05) while only dietary zinc without energy adjustment had a positive correlation with superoxide dismutase (SOD). RCS (P for non-linearity=0.933) and multiple linear regression (B=−0.084, P=0.009) indicated a negative linear association between dietary zinc and LTL. The adjustment of TNF-α rather than SOD could abolish the relationship. The mediation model suggested that the unfavorable effect of dietary zinc on LTL was mediated by TNF-α.

Conclusions

High dietary zinc may correlate with telomere attrition, and TNF-α can act as a mediator in this relationship. In the future, more extensive cohort studies are needed to further explore the relationship between dietary zinc and cellular aging and the specific mechanisms.

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Titel: High Dietary Zinc Intake Is Associated with Shorter Leukocyte Telomere Length, Mediated by Tumor Necrosis Factor-α: A Study of China Adults
verfasst von: B. Xing
J. Yu
Y. Liu
S. He
X. Chen
Z. Li
L. He
N. Yang
F. Ping
L. Xu
Wei Li
Huabing Zhang
Yuxiu Li
Publikationsdatum: 04.10.2023
Verlag: Springer Paris
Erschienen in: The journal of nutrition, health & aging / Ausgabe 10/2023
Print ISSN: 1279-7707
Elektronische ISSN: 1760-4788
DOI: https://doi.org/10.1007/s12603-023-1992-z

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