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Background  Quantification of coronary artery inflammation and atherosclerosis remains a challenge in high-risk individuals. In this study we sought to investigate if the glucagon like peptide-1 receptor agonist liraglutide has a direct anti-inflammatory effect in the coronary arteries using positron emission tomography (PET) with a radioactive tracer targeting activated macrophages in the vessel-wall.    Methods  Thirty randomly selected participants with type 2 diabetes from the placebo-controlled trial LIRAFLAME were enrolled in this sub-study. Participants were, prior to enrollment in this sub-study, randomized to either treatment with daily liraglutide (n=15) or placebo (n=15). Both groups underwent a combined [ 64 Cu]Cu-DOTATATE positron emission tomography and computed tomography scan of the heart at baseline and after 26 weeks of treatment. Coronary artery uptake of [ 64 Cu]Cu-DOTATATE were measured as maximum standardized uptake values (SUV max ); and means of the maximum values (mSUV max ), both values were calculated at the level of each participant and each individual coronary-segment.    Results  SUV max  and mSUV max  values decreased significantly in the liraglutide group both at the participant level (SUV max : p=0.013; mSUV max : p=0.004) and at the coronary-segment level (SUV max : p=0.001; mSUV max : p&amp;lt;0.0001). No change was observed in the placebo group neither at the participant level (SUV max : p=0.69; mSUV max : p=0.67) or at the coronary-segment level (SUV max : p=0.49; mSUV max : p=0.30). When comparing the mean change in uptake values between the two groups at both the participant level (SUV max : p=0.076; mSUV max : p=0.077) and the coronary segment level (SUV max : p=0.13; mSUV max : p=0.11) a borderline significant difference was observed. Baseline SUV max  [ 64 Cu]Cu-DOTATATE uptake values showed a weak positive correlation with the inflammatory biomarker high-sensitivity c-reactive protein (τ =0.26, p=0.045).    Conclusion  Liraglutide treatment for 26-weeks caused a significant reduction in [ 64 Cu]Cu-DOTATATE uptake in the coronary arteries whereas this was not seen in the placebo treated group. In addition, [ 64 Cu]Cu-DOTATATE PET/CT as a marker of coronary inflammation correlated with the systemic inflammation marker hs-CRP.

frontiers in endocrinology

Effect of 26 Weeks of Liraglutide Treatment on Coronary Artery Inflammation in Type 2 Diabetes Quantified by [64Cu]Cu-DOTATATE PET/CT: Results from the LIRAFLAME Trial