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Published in: Calcified Tissue International 6/2009

01-06-2009

Effect of GLP-1 Treatment on Bone Turnover in Normal, Type 2 Diabetic, and Insulin-Resistant States

Authors: Bernardo Nuche-Berenguer, Paola Moreno, Pedro Esbrit, Sonia Dapía, José R. Caeiro, Jesús Cancelas, Juan J. Haro-Mora, María L. Villanueva-Peñacarrillo

Published in: Calcified Tissue International | Issue 6/2009

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Abstract

It has been suggested that hormones released after nutrient absorption, such as glucose-dependent insulinotropic peptide (GIP) and glucagon-like peptide 2 (GLP-2), could be responsible for changes in bone resorption. However, information about the role of GLP-1 in this regard is scanty. Diabetes-related bone loss occurs as a consequence of poor control of glucose homeostasis, but the relationship between osteoporosis and type 2 diabetes remains unclear. Since GLP-1 is decreased in the latter condition, we evaluated some bone characteristics in streptozotocin-induced type 2 diabetic (T2D) and fructose-induced insulin-resistant (IR) rat models compared to normal (N) and the effect of GLP-1 or saline (control) treatment (3 days by osmotic pump). Blood was taken before and after treatment for plasma measurements; tibiae and femora were collected for gene expression of bone markers (RT-PCR) and structure (μCT) analysis. Compared to N, plasma glucose and insulin were, respectively, higher and lower in T2D; osteocalcin (OC) and tartrate-resistant alkaline phosphatase 5b were lower; phosphate in IR showed a tendency to be higher; PTH was not different in T2D and IR; all parameters were unchanged after GLP-1 infusion. Bone OC, osteoprotegerin (OPG) and RANKL mRNA were lower in T2D and IR; GLP-1 increased OC and OPG in all groups and RANKL in T2D. Compared to N, trabecular bone parameters showed an increased degree of anisotropy in T2D and IR, which was reduced after GLP-1. These findings show an insulin-independent anabolic effect of GLP-1 and suggest that GLP-1 could be a useful therapeutic agent for improving the deficient bone formation and bone structure associated with glucose intolerance.
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Metadata
Title
Effect of GLP-1 Treatment on Bone Turnover in Normal, Type 2 Diabetic, and Insulin-Resistant States
Authors
Bernardo Nuche-Berenguer
Paola Moreno
Pedro Esbrit
Sonia Dapía
José R. Caeiro
Jesús Cancelas
Juan J. Haro-Mora
María L. Villanueva-Peñacarrillo
Publication date
01-06-2009
Publisher
Springer-Verlag
Published in
Calcified Tissue International / Issue 6/2009
Print ISSN: 0171-967X
Electronic ISSN: 1432-0827
DOI
https://doi.org/10.1007/s00223-009-9220-3

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