Biliary effects of liraglutide and sitagliptin, a 12-week randomized placebo-controlled trial in type 2 diabetes patients

Mark M Smits, Lennart Tonneijck, Marcel H A Muskiet, Trynke Hoekstra, Mark H H Kramer, Michaela Diamant, Max Nieuwdorp, Albert K Groen, Djuna L Cahen, Daniël H van Raalte, Mark M Smits, Lennart Tonneijck, Marcel H A Muskiet, Trynke Hoekstra, Mark H H Kramer, Michaela Diamant, Max Nieuwdorp, Albert K Groen, Djuna L Cahen, Daniël H van Raalte

Abstract

Aims: Treatment with glucagon-like peptide (GLP)-1 receptor agonists or dipeptidyl peptidase (DPP)-4 inhibitors might increase gallstone formation; however, the mechanisms involved are unknown. We aimed to assess the effects of these drugs on gallbladder volume and bile acid profile.

Materials and methods: A total of 57 type 2 diabetes patients (mean ± SD age, 62.8 ± 6.9 years; BMI, 31.8 ± 4.1 kg/m2 ; HbA1c, 7.3% ± 0.6%), treated with metformin and/or sulfonylureas, were included in this 12-week randomized, placebo-controlled, double-blind, single-centre trial between July 2013 and August 2015 at the VU University Medical Center, the Netherlands. Patients received the GLP-1 receptor agonist liraglutide, the DPP-4 inhibitor sitagliptin or matching placebo for 12 weeks. Gallbladder fasting volume and ejection fraction were measured using ultrasonography after a high-fat meal. Serum bile acids were measured in the fasting and postprandial state and in faecal samples. The trial was registered at ClinicalTrials.gov (NCT01744236).

Results: Neither liraglutide nor sitagliptin had an effect on gallbladder fasting volume and ejection fraction (p > .05). Liraglutide increased serum levels of deoxycholic acid in the fasting state [0.20 µmol/L (95% CI 0.027-0.376), p = 0.024] and postprandial state [AUC 40.71 (13.22-68.21), p = 0.005] and in faeces [ratio 1.5 (1.03-2.19); p = 0.035]. Sitagliptin had no effect on serum bile acids, but increased faecal levels of chenodeoxycholic acid [ratio 3.42 (1.33-8.79), p = 0.012], cholic acid [ratio 3.32 (1.26-8.87), p = 0.017] and ursodeoxycholic acid [ratio 3.81 (1.44-10.14), p = 0.008].

Conclusions: Neither liraglutide nor sitagliptin has an effect on gallbladder volume. Observed changes in bile acids with liraglutide suggest alterations in the intestinal microbiome, while sitagliptin appears to increase hepatic bile acid production.

Keywords: DPP-4; GLP-1; bile acids; dipeptidyl peptidase 4; gallbladder emptying; gastric emptying; glucagon-like peptide 1.

© 2016 The Authors. Diabetes, Obesity and Metabolism published by John Wiley & Sons Ltd.

Figures

Figure 1
Figure 1
Gallbladder emptying. Gallbladder volume as measured using ultrasonography; A, before intervention and B, after 12‐week treatment with placebo, sitagliptin or liraglutide. Measurements were performed in the fasting state and after a high‐fat mixed meal; C, maximal ejection fraction (EF) at baseline and after 12‐week treatment; D, area under the curve of the gallbladder volume at baseline and after 12‐week treatment. No significant effects were observed.
Figure 2
Figure 2
Bile acids in serum. Area under the curve (AUC) and incremental‐AUC (iAUC) for the postprandial serum bile acids before and after 12‐week treatment with placebo (PCB), sitagliptin (SITA) or liraglutide (LIRA). Data are presented as µmol/l/2 h. A, cholic acid (CA); B, taurocholic acid (TCA); C, glycocholic acid (GCA); D, chenodeoxycholic acid (CDCA); E, tauro chenodeoxycholic acid (TCDCA); F, glycochenodeoxycholic acid (GCDCA); G, deoxycholic acid (DCA); H, taurodeoxycholic acid (TDCA); I, glycodeoxycholic acid (GDCA); J, ursodeoxycholic acid (UDCA); K, glyco‐ursodeoxycholic acid (GUDCA); L, litocholic acid (LCA); and M, glycinelitocholic acid (GLCA). Tauro‐ursodeoxycholic acid (TUDCA) and taurolithocholic acid (TLCA) are not depicted, as most values were below the detection limit. All data are presented as mean with standard error of the mean. Asterisks (*) indicate statistically significant differences (p < .05) between treatment and placebo, corrected for baseline differences.
Figure 3
Figure 3
Bile acids in faeces. Faecal bile acids and neutral sterols after 12‐weeks of treatment with placebo (PCB), sitagliptin (SITA) or liraglutide (LIRA). A, cholic acid (CA); B, chenodeoxycholic acid (CDCA); C, deoxycholic acid (DCA); D, ursodeoxycholic acid (UDCA); E, lithocholic acid (LCA); F, iso‐lithocholic acid (iso‐LCA); G, coprostanol; H, cholesterol; and I, dihydrocholesterol. All data are presented as median with interquartile range (box) and total range (whiskers). A logarithmic scale was chosen for the y‐axis because of the wide range of values. Asterisks (*) indicate statistically significant differences (p < .05) between treatment and placebo, corrected for baseline differences.

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