Iron status is associated with tibial structure and vitamin D metabolites in healthy young men

O’Leary, Thomas J., Jackson, Sarah, Izard, Rachel M., Walsh, Neil P., Carswell, Alexander, Oliver, Samuel J., Tang, Jonathan C. Y. ORCID: https://orcid.org/0000-0001-6305-6333, Fraser, William D. and Greeves, Julie (2024) Iron status is associated with tibial structure and vitamin D metabolites in healthy young men. Bone, 186. ISSN 8756-3282

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Abstract

The influence of iron on collagen synthesis and vitamin D metabolism has implications for bone health. This cross-sectional observational study investigated associations between markers of iron status and tibial structure, vitamin D metabolites, and circulating biochemical markers of bone metabolism in young healthy men. A total of 343 male British Army recruits participated (age 22 ± 3 y, height 1.77 ± 0.06 m, body mass 75.5 ± 10.1 kg). Circulating biochemical markers of iron status, vitamin D metabolites, and bone metabolism, and tibial structure and density by high-resolution peripheral quantitative computed tomography scans (HRpQCT) were measured in participants during week 1 of basic military training. Associations between markers of iron status and HRpQCT outcomes, bone metabolism, and vitamin D metabolites were tested, controlling for age, height, lean body mass, and childhood exercise volume. Higher ferritin was associated with higher total, trabecular, and cortical volumetric bone mineral density, trabecular volume, cortical area and thickness, stiffness, and failure load (all p ≤ 0.037). Higher soluble transferrin receptor (sTfR) was associated with lower trabecular number, and higher trabecular thickness and separation, cortical thickness, and cortical pore diameter (all p ≤ 0.033). Higher haemoglobin was associated with higher cortical thickness (p = 0.043). Higher ferritin was associated with lower βCTX, PINP, total 25(OH)D, and total 24,25(OH)2D, and higher 1,25(OH)2D:24,25(OH)2D ratio (all p ≤ 0.029). Higher sTfR was associated with higher PINP, total 25(OH)D, and total 24,25(OH)2D (all p ≤ 0.025). The greater density, size, and strength of the tibia, and lower circulating concentrations of markers of bone resorption and formation with better iron stores (higher ferritin) are likely as a result of the direct role of iron in collagen synthesis.

Item Type:	Article
Additional Information:	Funding information: This study was funded by the UK Ministry of Defence (Army).
Faculty \ School:	Faculty of Medicine and Health Sciences > Norwich Medical School
UEA Research Groups:	Faculty of Medicine and Health Sciences > Research Centres > Lifespan Health Faculty of Medicine and Health Sciences > Research Groups > Musculoskeletal Medicine Faculty of Medicine and Health Sciences > Research Centres > Metabolic Health
Depositing User:	LivePure Connector
Date Deposited:	04 Jun 2024 12:30
Last Modified:	07 Jun 2024 13:30
URI:	https://ueaeprints.uea.ac.uk/id/eprint/95383
DOI:	10.1016/j.bone.2024.117145

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