Forskning

May 3, 2018

Modulation of brain insulin signalling in Alzheimer’s disease: new insight on the protective role of green coffee extract

H E Mohamed et al, 2018. Modulation of brain insulin signalling in Alzheimer’s disease: new insight on the protective role of green coffee extract, Nutritional Neuroscience, published online.

ABSTRACT:

Objective: Alzheimer’s disease (AD), a neurodegenerative disorder, involves brain insulin signalling cascades and insulin resistance (IR). Because of limited treatment options, new treatment strategies are mandatory. Green coffee bean extract (GCBE) was reported to attenuate IR and improve brain energy metabolism. We aimed to investigate the possible use of GCBE as a prophylactic strategy to delay the onset of AD or combined with pioglitazone (PIO) as a strategy to retard the progression of AD. Methods: Rats received 10% fructose in drinking water for 18 weeks to induce AD. GCBE-prophylactic group received GCBE for 22 weeks started 4 weeks prior to fructose administration. The PIO group treated with PIO for 6 weeks started on week 12 of fructose administration. The GCBE+PIO group received GCBE for 22 weeks started 4 weeks prior to fructose administration and treated with PIO for the last 6 weeks of fructose administration. Results: Pre treatment with GCBE, either alone or combined with PIO, alleviated IR-induced AD changes. GCBE improved cognition, decreased serine phosphorylation of insulin receptor substrate, increased phosphoinositol-3 kinase (PI3K) activity and protein kinase B (Akt) gene expression, decreased glycogen synthase kinase-3β (GS3Kβ) gene expression and Tau hyperphosphorylation. Discussion: GCBE exerted neuroprotective effects against IR-induced AD mediated by alleviating IR and modulating brain insulin signalling cascade.