RESUMEN
Objective:To investigate the effect of vagus nerve stimulation (VNS) on the autophagy in penumbra of rats after middle cerebral artery occlusion (MCAO). Methods:A total of 56 Sprague-Dawley rats were divided into control group (n = 14), sham group (n = 14), model group (n = 14) and VNS group (n = 14). The model group and VNS group accepted MCAO for one hour, then reperfusion, and VNS group accepted VNS in the left as MCAO for 0.5 hour. Their infarct volume was detected with TTC staining, neurological impairment was assessed with Longa's score, and the expression of Beclin-1, microtubule-associated protein 1 light chain 3 (LC3)-II/I, phosphorylated adenosine monophosphate activated protein kinase (P-AMPK) and silent mating type information regulation 2 homolog 1 (Sirt1) were detected with Western blotting 24 hours after reperfusion. Results:Compared with the sham group, the infarct volume and Longa's score increased in the model group, while the expression of Beclin-1, LC3-II/I, P-AMPK and Sirt1 decreased significantly (P < 0.001). Compared with the model group, the infarct volume and Longa's score reduced (P < 0.05) in VNS group, while the expression of Beclin-1, LC3-II/I, P-AMPK and Sirt1 increased significantly (P < 0.001). Conclusion:VNS may alleviate cerebral ischemic injury in rats through AMPK-Sirt1 pathway.
RESUMEN
Alzheimer's disease (AD) is a common retrograde neurodegenerative disease of the central nervous system,as well as the most common type of dementia in the aged,the main manifestations of AD are progressive decline of cognitive function and daily life ability.AD seriously affects the quality of life and physical and mental health of the aged,and increased the burden of family and society.The etiology and pathogenesis of AD remain unclear nowadays,and there is no objective and specific biological marker to help the early diagnosis and effective treatment.Advanced glycation end products (AGEs) are stable end products formed by non enzymatic reaction between the free amino groups of proteins,lipids,nucleic acids macromolecules and the carbonyls of glucose or other reduced sugars.Recent years,more and more studies have focused on the correlation between AGEs and its receptors (RAGE) in patients with cognitive impairment,however,the role played by AGEs in the pathogenesis of AD remains unclear.The present paper will give an overview from three aspects:the structure and characteristics of AGEs,the relationship between the occurrence and development of AD and AGEs and the relationship between AGEs and prognosis of cognitive impairment which we've known so