Agmatine Improves Cognitive Dysfunction and Prevents Cell Death in a Streptozotocin-Induced Alzheimer Rat Model.
10.3349/ymj.2014.55.3.689
- Author:
Juhyun SONG
1
;
Bo Eun HUR
;
Kiran Kumar BOKARA
;
Wonsuk YANG
;
Hyun Jin CHO
;
Kyung Ah PARK
;
Won Taek LEE
;
Kyoung Min LEE
;
Jong Eun LEE
Author Information
1. Department of Anatomy, Yonsei University College of Medicine, Seoul, Korea. jelee@yuhs.ac
- Publication Type:Original Article ; Research Support, Non-U.S. Gov't
- Keywords:
Agmatine;
streptozotocin;
Alzheimer's disease;
cognitive dysfunction;
apoptosis;
insulin signal transduction
- MeSH:
Agmatine/*therapeutic use;
Alzheimer Disease/*chemically induced/*drug therapy;
Animals;
Cognition Disorders/*chemically induced/*drug therapy;
Disease Models, Animal;
Male;
Rats;
Streptozocin/*toxicity
- From:Yonsei Medical Journal
2014;55(3):689-699
- CountryRepublic of Korea
- Language:English
-
Abstract:
PURPOSE: Alzheimer's disease (AD) results in memory impairment and neuronal cell death in the brain. Previous studies demonstrated that intracerebroventricular administration of streptozotocin (STZ) induces pathological and behavioral alterations similar to those observed in AD. Agmatine (Agm) has been shown to exert neuroprotective effects in central nervous system disorders. In this study, we investigated whether Agm treatment could attenuate apoptosis and improve cognitive decline in a STZ-induced Alzheimer rat model. MATERIALS AND METHODS: We studied the effect of Agm on AD pathology using a STZ-induced Alzheimer rat model. For each experiment, rats were given anesthesia (chloral hydrate 300 mg/kg, ip), followed by a single injection of STZ (1.5 mg/kg) bilaterally into each lateral ventricle (5 microL/ventricle). Rats were injected with Agm (100 mg/kg) daily up to two weeks from the surgery day. RESULTS: Agm suppressed the accumulation of amyloid beta and enhanced insulin signal transduction in STZ-induced Alzheimer rats [experimetal control (EC) group]. Upon evaluation of cognitive function by Morris water maze testing, significant improvement of learning and memory dysfunction in the STZ-Agm group was observed compared with the EC group. Western blot results revealed significant attenuation of the protein expressions of cleaved caspase-3 and Bax, as well as increases in the protein expressions of Bcl2, PI3K, Nrf2, and gamma-glutamyl cysteine synthetase, in the STZ-Agm group. CONCLUSION: Our results showed that Agm is involved in the activation of antioxidant signaling pathways and activation of insulin signal transduction. Accordingly, Agm may be a promising therapeutic agent for improving cognitive decline and attenuating apoptosis in AD.
