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08 September 2017 : Animal Research  

Glucagon-Like Peptide-1 (GLP-1) Treatment Ameliorates Cognitive Impairment by Attenuating Arc Expression in Type 2 Diabetic Rats

Xiang-Sheng Cai123ABCDEF, Zhao-Guang Tan123ABCD, Jing-Jing Li1BCDE, Wei-Hong Gao123BCD, Shu-Ji Li4ABCD, Jin-Long Li1CDEF, Yong-Ming Tang5AEF, Hong-Wei Li1ADEF*, Hong-Xiang Hui1235ADEFG

DOI: 10.12659/MSM.903252

Med Sci Monit 2017; 23:4334-4342

Abstract

BACKGROUND: Glucagon-like peptide-1 (GLP-1) has been reported to exert some beneficial effects on the central nervous system (CNS). However, the effect of GLP-1 on cognitive impairment associated with type 2 diabetes is not well known. This study investigated the effect of GLP-1 on ameliorating memory deficits in type 2 diabetic rats.

MATERIAL AND METHODS: Type 2 diabetic rats were induced by a high-sugar, high-fat diet, followed by streptozotocin (STZ) injection and then tested in the Morris Water Maze (MWM) 1 week after the induction of diabetes. The mRNA expression of Arc, APP, BACE1, and PS1 were determined by real-time quantitative PCR, and the Arc protein was analyzed by immunoblotting and immunohistochemistry.

RESULTS: Type 2 diabetic rats exhibited a significant decline in learning and memory in the MWM tests, but GLP-1 treatment was able to protect this decline and significantly improved learning ability and memory. The mRNA expression assays showed that GLP-1 treatment markedly reduced Arc, APP, BACE1, and PS1 expressions, which were elevated in the diabetic rats. Immunoblotting and immunohistochemistry results also confirmed that Arc protein increased in the hippocampus of diabetic rats, but was reduced after GLP-1 treatment.

CONCLUSIONS: Our findings suggest that GLP-1 treatment improves learning and memory deficits in type 2 diabetic rats, and this effect is likely through the reduction of Arc expression in the hippocampus.

Keywords: Diabetes Mellitus, Type 2, Glucagon-Like Peptide 1

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Medical Science Monitor Basic Research eISSN: 2325-4416
Medical Science Monitor Basic Research eISSN: 2325-4416