|Degradation, receptor binding, insulin secreting and antihyperglycaemic actions of palmitate-derivatised native and Ala8-substituted GLP-1 analogues.|
|PMID: 15101559 Owner: NLM Status: MEDLINE|
|The hormone glucagon-like peptide-1(7-36)amide (GLP-1) is released in response to ingested nutrients and acts to promote glucose-dependent insulin secretion ensuring efficient postprandial glucose homeostasis. Unfortunately, the beneficial actions of GLP-1 which give this hormone many of the desirable properties of an antidiabetic drug are short lived due to degradation by dipeptidyl-peptidase IV (DPP IV) and rapid clearance by renal filtration. In this study we have attempted to extend GLP-1 action through the attachment of palmitoyl moieties to the epsilon-amino group in the side chain of the Lys26 residue and to combine this modification with substitutions of the Ala8 residue, namely Val or amino-butyric acid (Abu). In contrast to native GLP-1, which was rapidly degraded, [Lys(pal)26]GLP-1, [Abu8, Lys(pal)26]GLP-1 and [Val8 Lys(pal)26]GLP-1 all exhibited profound stability during 12 h incubations with DPP IV and human plasma. Receptor binding affinity and the ability to increase cyclic AMP in the clonal beta-cell line BRIN-BD11 were decreased by 86- to 167-fold and 15- to 62-fold, respectively compared with native GLP-1. However, insulin secretory potency tested using BRIN-BD11 cells was similar, or in the case of [Val8,Lys(pal)26]GLP-1 enhanced. Furthermore, when administered in vivo together with glucose to diabetic (ob/ob) mice, [Lys(pal)26]GLP-1, [Abu8,Lys(pal)26]GLP-1 and [Val8,Lys(pal)26]GLP-1 did not demonstrate acute glucose-lowering or insulinotropic activity as observed with native GLP-1. These studies support the potential usefulness of fatty acid linked analogues of GLP-1 but indicate the importance of chain length for peptide kinetics and bioavailability.|
|Brian D Green; Victor A Gault; Mark H Mooney; Nigel Irwin; Patrick Harriott; Brett Greer; Cliff J Bailey; Finbarr P M O'Harte; Peter R Flatt|
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|Type: Journal Article; Research Support, Non-U.S. Gov't|
|Title: Biological chemistry Volume: 385 ISSN: 1431-6730 ISO Abbreviation: Biol. Chem. Publication Date: 2004 Feb|
|Created Date: 2004-04-22 Completed Date: 2004-05-19 Revised Date: 2013-03-19|
Medline Journal Info:
|Nlm Unique ID: 9700112 Medline TA: Biol Chem Country: Germany|
|Languages: eng Pagination: 169-77 Citation Subset: IM|
|School of Biomedical Sciences, University of Ulster, Coleraine BT52 1SA, Northern Ireland, UK. email@example.com|
|APA/MLA Format Download EndNote Download BibTex|
Blood Glucose / metabolism
Cyclic AMP / biosynthesis
Dipeptidyl Peptidase 4 / metabolism
Glucagon / blood, chemistry, pharmacokinetics*, pharmacology*
Glucagon-Like Peptide 1
Hypoglycemic Agents / chemistry, pharmacokinetics, pharmacology
Insulin / metabolism, secretion*
Islets of Langerhans / drug effects, secretion
Lysine / chemistry
Palmitates / chemistry*, pharmacokinetics, pharmacology
Peptide Fragments / blood, chemistry, pharmacokinetics*, pharmacology*
Protein Precursors / blood, chemistry, pharmacokinetics*, pharmacology*
Receptors, Glucagon / metabolism
Valine / chemistry
|0/Blood Glucose; 0/Hypoglycemic Agents; 0/Insulin; 0/Palmitates; 0/Peptide Fragments; 0/Protein Precursors; 0/Receptors, Glucagon; 0/glucagon-like peptide-1 receptor; 56-41-7/Alanine; 56-87-1/Lysine; 60-92-4/Cyclic AMP; 7004-03-7/Valine; 89750-14-1/Glucagon-Like Peptide 1; 9007-92-5/Glucagon; EC 18.104.22.168/Dipeptidyl Peptidase 4|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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