Can New Target Boost Bone Health in Older Women With T2D?

TOPLINE:

In older postmenopausal women with type 2 diabetes (T2D), pyridoxamine treatment has potential to prevent fractures and protect bone tissue by targeting advanced glycation end products and also lowers levels of A1c, an early glycation product.

METHODOLOGY:

• Despite greater bone density and low bone turnover, people with T2D have increased fractures risk and higher associated mortality, but previous research linking advanced glycation end products (AGEs) to bone fragility suggests an AGE inhibitor could be a novel therapeutic strategy to prevent the accumulation of AGE in bone tissue.
• This randomized clinical trial, conducted at the Metabolic Bone Disease Unit of Columbia University Irving Medical Center, New York City, from December 2017 to February 2021, assessed the efficacy of the vitamin B6 metabolite pyridoxamine, an AGE inhibitor, in promoting bone formation in 55 older postmenopausal women with T2D.
• The participants received either 200 mg of oral pyridoxamine dihydrochloride (n = 27; mean age, 75.6 years) or matching placebo tablets (n = 28; mean age, 73.1 years) twice daily for 1 year.
• The primary outcome was the change in the levels of the bone formation marker P1NP from baseline to after 12 months of treatment.
• Other outcomes included changes in bone mineral density measured at the lumbar spine, total hip, femoral neck, and 1/3 radius using dual energy x-ray absorptiometry; A1c levels; and skin autofluorescence at 12 months, a surrogate for bone AGEs. The safety of pyridoxamine was evaluated by monitoring neurologic findings and adverse events because high doses of the parent vitamin B6 have been reported to cause neurotoxicity.

TAKEAWAY:

• At 12 months, pyridoxamine treatment increased P1NP levels by 23% (P = .028) compared with 4.1% with placebo (P = .576), a “nearly significant difference.”
• Bone mineral density at the femoral neck increased by 2.64% with pyridoxamine but decreased by 0.91% with placebo (P = .007), with no changes at the lumbar spine, total hip, or 1/3 radius. The levels of bone resorption markers or skin autofluorescence were not significantly different between the groups.
• A1c levels decreased by 0.38% in the pyridoxamine group and correlated with increased P1NP levels, compared with a 0.05% increase in the placebo group (P = .04).
• Pyridoxamine was well tolerated. Four serious adverse events were reported in the pyridoxamine group and seven in the placebo group; none of these were related to the trial treatment.

IN PRACTICE:

“[The study] findings suggest that AGE inhibition might clinically improve the low bone formation state of T2D, and that PM [pyridoxamine] might warrant further investigation as a potential disease mechanism-directed approach for the therapy of T2D bone fragility,” the authors wrote.

SOURCE:

The study was led by Aiden V. Brossfield, Metabolic Bone Disease Unit, Vagelos College of Physicians and Surgeons, Columbia University Irving Medical Center. It was published online in The Journal of Clinical Endocrinology & Metabolism.

LIMITATIONS:

The study findings were preliminary. The study’s small sample size and individual variability led to a lack of statistical significance. The exclusion of men may have limited the generalizability of the findings. The short duration of 1 year may have been insufficient for detecting changes in skin AGEs. The levels of circulating AGEs or pyridoxamine were not measured, which could have provided additional insights.

DISCLOSURES:

The study was supported by a grant from the US National Institute on Aging. The authors declared no 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.