Cited by 206Diabetes Treatment and ManagementPeptidase Inhibition and AnalysisDiabetes Management and Research

Hyperglycaemia increases dipeptidyl peptidase IV activity in diabetes mellitus

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Mannucci, E., Pala, L., Ciani, S., Bardini, G., Pezzatini, A., Sposato, I., Cremasco, F., Ognibene, A. +1 more·2005·Diabetologia

Abstract

Aims/hypotheses Chronic hyperglycaemia increases dipeptidyl peptidase IV (DPP-IV) activity in endothelial cells in vitro. The present study was designed to assess the effect of high glucose on circulating DPP-IV activity in patients with type 1 and type 2 diabetes.Methods Plasma DPP-IV activity was measured in 29 patients with type 1 diabetes and 29 age-, sex- and BMI-matched control subjects. We also assessed DPP-IV activity in 31 type 2 diabetic patients with HbA1c > 8.5% and in plasma from matched groups of 31 newly diagnosed diabetic subjects with HbA1c < 7.5%, 31 subjects with IGT and 62 subjects with NGT. In a further sample of 66 type 2 diabetic patients, a longitudinal study was also performed to evaluate variations in DPP-IV activity and HbA1c over 3 months.Results DPP-IV activity in type 1 diabetic patients was not significantly different from that in control subjects; however, a significant correlation between DPP-IV and HbA1c was observed in diabetic subjects (r = 0.47; p < 0.01). Type 2 diabetic patients with HbA1c > 8.5% showed significantly (p < 0.05) higher DPP-IV activity (mean+/-SD 27.7+/-7.1 U/l) than newly diagnosed diabetic patients and subjects with IGT (22.1+/-6.0 and 18.8+/-8.8 U/l, respectively). Variations in DPP-IV activity over 3 months in type 2 diabetic patients showed a significant positive correlation with variations in HbA1c (r = 0.26; p < 0.05).Conclusions/interpretation Chronic hyperglycaemia induces a significant increase in DPP-IV activity in type 1 and type 2 diabetes. This phenomenon could contribute to the reduction in circulating active glucagon-like peptide-1 and to the consequent postprandial hyperglycaemia in type 2 diabetic patients with poor metabolic control.

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Authors
Mannucci, E., Pala, L., Ciani, S., Bardini, G., Pezzatini, A., Sposato, I., Cremasco, F., Ognibene, A., & Rotella, C. M.
Affiliations
  • University of Florence (IT)
  • Azienda Ospedaliero-Universitaria Careggi (IT)
Corresponding author
Rotella, C. M.
Venue
Diabetologia
Published
2005-04-29
Volume
48
Issue
6
Pages
1168-1172
ISSN
  • 0012-186X (ISSN-L)
  • 1432-0428
OpenAlex
W2152731692
Cited by
206
References
24
Citations by year
2026: 3 · 2025: 2 · 2024: 3 · 2023: 6 · 2022: 2 · 2021: 10 · 2020: 9 · 2019: 10 · 2018: 12 · 2017: 14 · 2016: 20 · 2015: 14 · 2014: 16 · 2013: 12 · 2012: 14
FWCI
5.17
Type
journal article
Language
en
Open access
Locations
  • Diabetologia (publishedVersion)
  • PubMed (publishedVersion)
  • Florence Research (University of Florence) (submittedVersion)
Funders
  • Ministero dell’Istruzione, dell’Università e della Ricerca
  • Università degli Studi di Firenze
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Treatment and Management
  • Health Sciences › Medicine › Oncology › Peptidase Inhibition and Analysis
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Management and Research
Keywords
dipeptidyl peptidase IV, hyperglycemia, type 1 diabetes, type 2 diabetes, HbA1c, glucagon-like peptide-1, endothelial cells, impaired glucose tolerance, glycemic control, plasma enzyme activity
MeSH terms
Adult, Aged, Diabetes Mellitus, Type 1, Diabetes Mellitus, Type 2, Female, Humans, Hyperglycemia, Longitudinal Studies, Male, Reference Values, Regression Analysis, Body Mass Index, Dipeptidyl Peptidase 4

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