| Abstrakt: |
Introduction: While the involvement of neuropeptide Y (NPY) in learning and memory, as well as the role of the Y1 receptor, are well established, the function of the Y2 receptor remains a topic of debate. While the involvement of neuropeptide Y (NPY) in learning and memory, as well as the role of the Y1 receptor, are well established, the function of the Y2 receptor remains a topic of debate. Some studies suggest that NPY may also play a role in autophagy. In our investigation, we aimed to explore whether NPY and its Y2 receptor inhibitor could influence memory modulation or affect Beclin-1 expression in a rat model of Alzheimer’s disease (AD). NPY may also have a role in autophagy, according to some studies. Methods: Intracerebroventricular (i.c.v) injections of amyloid-beta (Aβ1-42, 2µg/µl/ side) were used to establish an animal model of AD. NPY (10 ng/µl, 10 µl, i.c.v) was administered 30 minutes before the retrieval. Y2 antagonist BIIE-0246 was injected 15 minutes before NPY administration in the targeted groups. BIIE-0246 was used at three different concentrations (20 nM, 200 nM, and 2 µM). Passive avoidance memory and novel object recognition were both evaluated. Subsequently, Beclin-1 protein expression in the hippocampus was determined using western blot analysis. Results: It was found that NPY administration improved passive avoidance and cognitive memory in animals treated with Aβ. Injecting BIIE-0246 before NPY did not reverse the improving effect of NPY on passive avoidance and Novel Object Recognition memories. Furthermore, compared to sham-operated animals, Aβ treatment significantly reduced the hippocampal expression of Beclin-1 protein (P≤0.05), and neither NPY nor NPY Y2 receptor inhibitors affected Beclin-1. Conclusion: In Aβ-induced memory impairment, it is thought that NPY can improve both aversive and cognitive memory. Blocking NPY Y2 receptors with BIIE-0246 did not alter NPY’s memory-enhancing effect. [ABSTRACT FROM AUTHOR] |
