Document Detail


Dipeptidyl peptidase IV resistant analogues of glucagon-like peptide-1 which have extended metabolic stability and improved biological activity.
MedLine Citation:
PMID:  9541166     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Glucagon-like peptide 1 (GLP-1) has great potential in diabetes therapy due to its glucose-dependent stimulation of insulin secretion, but this is limited by its rapid degradation, primarily by dipeptidyl peptidase IV. Four analogues, N-terminally substituted with threonine, glycine, serine or alpha-aminoisobutyric acid, were synthesised and tested for metabolic stability. All were more resistant to dipeptidyl peptidase IV in porcine plasma in vitro, ranging from a t1/2 of 159 min (Gly8 analogue) to undetectable degradation after 6 h (Aib8 analogue; t1/2 for GLP-1 (7-36) amide, 28 min). During i. v. infusion in anaesthetised pigs, over 50% of each analogue remained undegraded compared to 22.7 % for GLP-1 (7-36) amide. In vivo, analogues had longer N-terminal t1/2 (intact peptides: means, 3.3-3.9 min) than GLP-1 (7-36) amide (0.9 min; p < 0.01), but these did not exceed the C-terminal t1/2 (intact plus metabolite: analogues, 3.5-4.4 min; GLP-1 (7-36) amide, 4.1 min). Analogues were assessed for receptor binding using a cell line expressing the cloned receptor, and for ability to stimulate insulin or inhibit glucagon secretion from the isolated perfused porcine pancreas. All bound to the receptor, but only the Aib8 and Gly8 analogues had similar affinities to GLP-1 (7-36) amide (IC50; Aib8=0.45 nmol/l; Gly8=2.8 nmol/l; GLP-1 (7-36) amide=0.78 nmol/l). All analogues were active in the isolated pancreas, with the potency order reflecting receptor affinities (Aib8 > Gly8 > Ser8 > Thr8). N-terminal modification of GLP-1 confers resistance to dipeptidyl peptidase IV degradation. Such analogues are biologically active and have prolonged metabolic stability in vivo, which, if associated with greater potency and duration of action, may help to realise the potential of GLP-1 in diabetes therapy.
Authors:
C F Deacon; L B Knudsen; K Madsen; F C Wiberg; O Jacobsen; J J Holst
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Diabetologia     Volume:  41     ISSN:  0012-186X     ISO Abbreviation:  Diabetologia     Publication Date:  1998 Mar 
Date Detail:
Created Date:  1998-05-26     Completed Date:  1998-05-26     Revised Date:  2013-03-19    
Medline Journal Info:
Nlm Unique ID:  0006777     Medline TA:  Diabetologia     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  271-8     Citation Subset:  IM    
Affiliation:
Department of Medical Physiology, The Panum Institute, University of Copenhagen, Denmark.
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MeSH Terms
Descriptor/Qualifier:
Animals
Cross Reactions
Dipeptidyl Peptidase 4 / metabolism*
Drug Stability
Glucagon / analogs & derivatives*,  blood,  metabolism*,  pharmacokinetics
Glucagon-Like Peptide 1
Glucagon-Like Peptides
Insulin / secretion
Pancreas / drug effects,  metabolism
Peptide Fragments / blood,  metabolism*,  pharmacokinetics,  pharmacology
Perfusion
Protein Binding
Protein Precursors / blood,  metabolism*,  pharmacokinetics
Receptors, Glucagon / metabolism
Swine
Chemical
Reg. No./Substance:
0/Insulin; 0/Peptide Fragments; 0/Protein Precursors; 0/Receptors, Glucagon; 0/glucagon-like peptide-1 receptor; 119637-73-9/glucagon-like peptide 1 (7-36)amide; 62340-29-8/Glucagon-Like Peptides; 89750-14-1/Glucagon-Like Peptide 1; 9007-92-5/Glucagon; EC 3.4.14.5/Dipeptidyl Peptidase 4

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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