| First Author | Faivre E | Year | 2013 |
| Journal | Alzheimers Res Ther | Volume | 5 |
| Issue | 2 | Pages | 20 |
| PubMed ID | 23601582 | Mgi Jnum | J:269874 |
| Mgi Id | MGI:6275725 | Doi | 10.1186/alzrt174 |
| Citation | Faivre E, et al. (2013) Neuroprotective effects of D-Ala(2)GIP on Alzheimer's disease biomarkers in an APP/PS1 mouse model. Alzheimers Res Ther 5(2):20 |
| abstractText | INTRODUCTION: Type 2 diabetes mellitus has been identified as a risk factor for Alzheimer's disease (AD). An impairment of insulin signaling as well as a desensitization of its receptor has been found in AD brains. Glucose-dependent insulinotropic polypeptide (GIP) normalises insulin signaling by facilitating insulin release. GIP directly modulates neurotransmitter release, LTP formation, and protects synapses from the detrimental effects of beta-amyloid fragments on LTP formation, and cell proliferation of progenitor cells in the dentate gyrus. Here we investigate the potential therapeutic property of the new long lasting incretin hormone analogue D-Ala(2)GIP on key symptoms found in a mouse model of Alzheimer' disease (APPswe/PS1detaE9). METHODS: D-Ala(2)GIP was injected for 21 days at 25 nmol/kg ip once daily in APP/PS1 male mice and wild type (WT) littermates aged 6 or 12 months of age. Amyloid plaque load, inflammation biomarkers, synaptic plasticity in the brain (LTP), and memory were measured. RESULTS: D-Ala(2)GIP improved memory in WT mice and rescued the cognitive decline of 12 months old APP/PS1 mice in two different memory tasks. Furthermore, deterioration of synaptic function in the dentate gyrus and cortex was prevented in 12 months old APP/PS1 mice. D-Ala(2)GIP facilitated synaptic plasticity in APP/PS1 and WT mice and reduced the number of amyloid plaques in the cortex of D-Ala(2)GIP injected APP/PS1 mice. The inflammatory response in microglia was also reduced. CONCLUSION: The results demonstrate that D-Ala(2)GIP has neuroprotective properties on key hallmarks found in AD. This finding shows that novel GIP analogues have the potential as a novel therapeutic for AD. |
