Nine-month follow-up of the insulin receptor signalling cascade in the brain of streptozotocin rat model of sporadic Alzheimer’s disease (CROSBI ID 214051)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Osmanović-Barilar, Jelena ; Knezović, Ana ; Grünblatt, Edna ; Riederer, Peter ; Šalković- Petrišić, Melita
engleski
Nine-month follow-up of the insulin receptor signalling cascade in the brain of streptozotocin rat model of sporadic Alzheimer’s disease
Sporadic Alzheimer disease (sAD) is associated with impairment of insulin receptor (IR) signalling in the brain. Rats used to model sAD develop insulin-resistant brain state following intracerebroventricular treatment with a betacytotoxic drug streptozotocin (STZ-icv). Brain IR signalling has been explored usually at only one time point in periods ≤3 months after the STZ-icv administration. We have investigated insulin signalling in the rat hippocampus at five time points in periods ≤9 months after STZ-icv treatment. Male Wistar rats were given vehicle (control)- or STZ (3 mg/kg)-icv injection and killed 0.5, 1, 3, 6 and 9 months afterwards. Insulin-1 (Ins-1), IR, phospho- and total (p/t)-glycogen synthase kinase 3-β (GSK-3β), p/t-tau and insulin degrading enzyme (IDE) mRNA and/or protein were measured. Acute upregulation of tau and IR mRNA (p < 0.05) was followed by a pronounced downregulation of Ins-1, IR and IDE mRNA (p < 0.05) in the course of time. Acute decrement in p/t-tau and p/t-GSK-3β ratios (p < 0.05) was followed by increment in both ratios (3–6 months, p < 0.05) after which p/t-tau ratio demonstrated a steep rise and p/t-GSK-3β ratio a steep fall up to 9 months (p < 0.05). Acute decline in IDE and IR expression (p < 0.05) was followed by a slow progression of the former and a slow recovery of the latter in 3–9 months. Results indicate a biphasic pattern in time dependency of onset and progression of changes in brain insulin signalling of STZ-icv model (partly reversible acute toxicity and chronic AD-like changes) which should be considered when using this model as a tool in translational sAD research.
Insulin signalling ; brain ; streptozotocin ; IDE ; tau ; Alzheimer
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Podaci o izdanju
122 (4)
2015.
565-576
objavljeno
0300-9564
1435-1463
10.1007/s00702-014-1323-y
Povezanost rada
Temeljne medicinske znanosti