Abstract:
OBJECTIVE:To assess the mechanistic effects of the glucagon-like peptide 1 (GLP-1) receptor agonist liraglutide and the dipeptidyl peptidase 4 (DPP-4) inhibitor sitagliptin on (exocrine) pancreatic physiology and morphology. RESEARCH DESIGN AND METHODS:For this randomized, double-blind, parallel-group trial, 55 patients with type 2 diabetes treated with metformin and/or sulfonylurea agents were included. Participants received liraglutide 1.8 mg (n = 19), sitagliptin 100 mg (n = 19), or matching placebos (n = 17) once daily for 12 weeks. The primary end point was change in exocrine function (intraduodenal pancreatic fluid secretion, lipase activity, fecal elastase-1, and chymotrypsin). Secondary end points included changes in plasma enzyme concentrations and pancreatic morphology (per MRI). RESULTS:No patient developed pancreatitis. Sitagliptin increased intraduodenal pancreatic fluid secretion by 16.3 mL (95% CI -0.3 to 32.9; P = 0.05), whereas liraglutide did not change exocrine pancreatic function. Neither therapy increased lipase/amylase levels after 12 weeks. However, liraglutide increased lipase levels after 6 weeks (23.5 U/L [95% CI 2.1-44.8]; P = 0.03) and sitagliptin increased amylase levels after 2 and 6 weeks (13.7 U/L [95% CI 3.4-23.9]; P = 0.03). Both drugs increased plasma trypsinogen after 12 weeks (liraglutide: 34.6 µg/mL [95% CI 15.1-54.2], P = 0.001; sitagliptin: 23.9 µg/mL [95% CI 4.9-42.9], P = 0.01). Neither changed pancreatic morphology, although liraglutide tended to increase pancreatic volume (7.7 cm3 [95% CI -1.2 to 16.6]; P = 0.09). Treatment-induced volume expansion was associated with increased amylase levels. CONCLUSIONS:A 12-week treatment with liraglutide or sitagliptin only resulted in a brief and modest increase of plasma pancreatic enzyme concentrations in patients with type 2 diabetes. Apart from a minimal sitagliptin-induced increase in intraduodenal fluid secretion, pancreatic exocrine function was unaffected. The long-term clinical consequences of these discrete changes require further study.
journal_name
Diabetes Carejournal_title
Diabetes careauthors
Smits MM,Tonneijck L,Muskiet MH,Kramer MH,Pieters-van den Bos IC,Vendrik KE,Hoekstra T,Bruno MJ,Diamant M,van Raalte DH,Cahen DLdoi
10.2337/dc16-0836subject
Has Abstractpub_date
2017-03-01 00:00:00pages
301-308issue
3eissn
0149-5992issn
1935-5548pii
dc16-0836journal_volume
40pub_type
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