Key result
Subcutaneous semaglutide 1 mg once weekly did not significantly alter coprimary MRI outcomes of oxygenation, global perfusion, and tissue inflammation compared to placebo.
Why the study?
Does subcutaneous semaglutide 1 mg once weekly improve kidney oxygenation, perfusion, and inflammation in patients with type 2 diabetes and chronic kidney disease?
RCT (n=106)
Randomized
Does subcutaneous semaglutide 1 mg once weekly improve kidney oxygenation, perfusion, and inflammation in patients with type 2 diabetes and chronic kidney disease?
Although semaglutide did not significantly alter primary MRI measures of kidney oxygenation or perfusion, secondary findings suggest its kidney-protective mechanisms may involve reduced vascular resistance, prevention of fibrosis, and improved endothelial cell health.
Answers are grounded in this paper and cite their sources.
Semaglutide kidney effects in T2D and CKD remain mechanistically unclear; leaves open whether imaging endpoints predict hard outcomes.
The GLP-1 receptor agonist semaglutide preserves kidney function in people with type 2 diabetes and chronic kidney disease, but the underlying mechanisms are unclear. Here we report a 52-week randomized trial of subcutaneous semaglutide 1 mg once weekly versus placebo (n = 106 (n = 25 women, n = 81 men)) in participants with type 2 diabetes and chronic kidney disease. To identify kidney-specific mechanisms of action for semaglutide, we performed integrated multiparametric magnetic resonance imaging of the kidney and biopsy for histology (n = 33), alongside single-nucleus (n = 22) and spatial transcriptomics (n = 13) on paired samples with before- and after-treatment measurements. Coprimary magnetic resonance imaging outcomes (oxygenation by R2*, global perfusion and tissue inflammation by T1 mapping) were not significantly altered by semaglutide versus placebo treatment. Secondary outcomes revealed that semaglutide treatment, as compared to placebo, was associated with a significantly reduced renal artery resistive index and stabilization of the apparent diffusion coefficient, indicating prevention of fibrosis progression. Moreover, secondary transcriptomic outcomes revealed pronounced effects of semaglutide on glomerular endothelial cells, consistent with the results of spatial analyses indicating reduced numbers of immune cells in the proximity of these endothelial cells. The results from this trial indicate that mechanisms of kidney protection by semaglutide may include reduced vascular resistance, prevention of fibrosis and improved underlying molecular programs promoting endothelial cell health. ClinicalTrials.gov identifier: NCT04865770 . A randomized trial in individuals with type 2 diabetes probed the kidney-protective mechanisms of semaglutide using a range of techniques, including histology, multiparametric MRI and transcriptomics.
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Tuttle et al. (2026) conducted an RCT in Type 2 diabetes and chronic kidney disease (n=106). Semaglutide vs. Placebo was evaluated on Coprimary magnetic resonance imaging outcomes (oxygenation by R2, global perfusion and tissue inflammation by T1 mapping). Subcutaneous semaglutide 1 mg once weekly did not significantly alter coprimary MRI outcomes of oxygenation, global perfusion, and tissue inflammation compared to placebo.
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