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Related Experiment Video

Updated: Aug 15, 2025

Quantitating Iron Transport Across the Mouse Placenta In Vivo Using Nonradioactive Iron Isotopes
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Causal effect of iron status on lung function: A Mendelian randomization study.

Zhimin Yu1,2, Chengkai Xu1, Chenggang Fang1

  • 1Department of General Medicine and Geriatrics, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan, China.

Frontiers in Nutrition
|January 2, 2023
PubMed
Summary

Higher iron levels causally increase lung function measures like forced expiratory volume in 1 second (FEV1) and forced vital capacity (FVC). This finding highlights iron status as a key factor for managing respiratory health.

Keywords:
FEV1FVCMendelian randomizationironlung function

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Area of Science:

  • Genetics
  • Pulmonology
  • Biochemistry

Background:

  • Observational studies present conflicting data on the relationship between systemic iron status and lung function.
  • Investigating potential causal links is crucial for understanding and managing lung health.

Purpose of the Study:

  • To explore the causal relationship between iron status biomarkers and lung function levels.
  • Utilize a two-sample Mendelian randomization (MR) design for robust causal inference.

Main Methods:

  • Employed genetic instruments for iron status biomarkers from the Genetics of Iron Status (GIS) consortium (N=48,972).
  • Extracted lung function data (FEV1, FVC) from UK Biobank and SpiroMeta consortium (N=400,102).
  • Performed primary analyses using inverse-variance weighted method, supplemented by sensitivity analyses.

Main Results:

  • Genetically predicted higher iron, ferritin, and transferrin saturation were associated with increased FEV1.
  • Higher transferrin levels showed an association with decreased FEV1.
  • A significant positive association was observed between iron status and FVC, with no causal link to the FEV1-to-FVC ratio.

Conclusions:

  • Provides strong evidence for a causal association between higher iron status and improved FEV1 and FVC.
  • Iron status does not appear to causally influence airway obstruction (FEV1/FVC ratio).
  • Confirms iron status as a significant target for optimizing lung function management.