Oxidative Stress Marker May Signal Fracture Risk in T2D

TOPLINE:

Elevated levels of plasma F2-isoprostanes, a reliable marker of oxidative stress, are associated with an increased risk for fractures in older ambulatory patients with type 2 diabetes (T2D) independently of bone density.

METHODOLOGY:

• Patients with T2D face an increased risk for fractures at any given bone mineral density; oxidative stress levels (reflected in circulating F2-isoprostanes), which are elevated in T2D, are associated with other T2D complications, and may weaken bone integrity.
• Researchers analyzed data from an observational cohort study to investigate the association between the levels of circulating F2-isoprostanes and the risk for clinical fractures in older patients with T2D.
• The data included 703 older ambulatory adults (baseline age, 70-79 years; about half White individuals and half Black individuals ; about half men and half women) from the Health, Aging and Body Composition Study, of whom 132 had T2D.
• Plasma F2-isoprostane levels were measured using baseline serum samples; bone turnover markers were also measured including procollagen type 1 N-terminal propeptide, osteocalcin, and C-terminal telopeptide of type 1 collagen.
• Incident clinical fractures were tracked over a follow-up period of up to 17.3 years, with fractures verified through radiology reports.

TAKEAWAY:

• Overall, 25.8% patients in the T2D group and 23.5% adults in the non-diabetes group reported an incident clinical fracture during a mean follow-up period of 6.2 and 8.0 years, respectively.
• In patients with T2D, the risk for incident clinical fracture increased by 93% for every standard deviation increase in the log F2-isoprostane serum levels (hazard ratio [HR], 1.93; 95% CI, 1.26-2.95; P = .002) independently of baseline bone density, medication use, and other risk factors, with no such association reported in individuals without T2D (HR, 0.98; 95% CI, 0.81-1.18; P = .79).
• In the T2D group, elevated plasma F2-isoprostane levels were also associated with a decrease in total hip bone mineral density over 4 years (r = −0.28; P = .008), but not in the non-diabetes group.
• No correlation was found between plasma F2-isoprostane levels and circulating advanced glycoxidation end-products, bone turnover markers, or A1c levels in either group.

IN PRACTICE:

“Oxidative stress in T2D may play an important role in the decline of bone quality and not just bone quantity,” the authors wrote.

SOURCE:

This study was led by Bowen Wang, PhD, Rensselaer Polytechnic Institute, Troy, New York. It was published online in The Journal of Clinical Endocrinology & Metabolism.

LIMITATIONS:

This study was conducted in a well-functioning elderly population with only White and Black participants, which may limit the generalizability of the findings to other age groups or less healthy populations. Additionally, the study did not assess prevalent vertebral fracture risk due to the small sample size. 

DISCLOSURES:

This study was supported by the US National Institute on Aging and the Intramural Research Program of the US National Institutes of Health, and the Dr and Ms Sands and Sands Family for Orthopaedic Research. The authors reported no relevant conflicts of interest.

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.