Neuroprotective effects of enriched environment in MPTP-treated SAMP8 mice.
Neuroprotective effects of enriched environment (EE) have been well established. Recent study suggests that exposure to EE can protect dopaminergic neurons against MPTP-induced Parkinsonism. After 64 female SAMP8 mice were reared in EE and standard environment (SE) for 3 months, the effects of EE and SE were compared on behavioural change, tyrosine hydroxylase (TH) immunoreaction positive neuron and dopaminetransporter (DAT) expression in 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine(MPTP)-treated SAMP8. EE mice showed decreased spontaneous activity compared with SE mice. But EE+MPTP mice showed less decreased spontaneous activity compared with SE+MPTP mice. Otherwise, EE mice showed increased percentage of entries into the open arms and percentage of time spent in the open arms. Furthermore, EE mice demonstrated reduced neurotoxicity, with less decreased TH mRNA and protein expression in Substantia Nigra (SN) after MPTP administration compared with SE mice. SE mice showed a 53.77% loss of TH-positive neurons, whereas EE mice only showed a 42.28% loss. Moreover, EE mice showed decreased DAT mRNA and protein expression compared with SE mice. These data demonstrate that EE can protect dopaminergic neurons against MPTP-induced neuronal damage, which suggest that the probability of developing Parkinson's disease (PD) may be related to life environment.
Yuan
Zhen-Yun
ZY
The First Hospital of Hebei Medical University, Brain Aging and Cognitive, Neuroscience Laboratory of Hebei Province, Shijiazhuang 050031, China.
Gu
Ping
P
Liu
Li
L
Wang
Yan-Yong
YY
Liu
Jing
J
Cui
Dong-Sheng
DS
Geng
Yuan
Y
Zhang
Zhong-Xia
ZX
Zhu
Ai-Ping
AP
Ma
Lin
L
Wang
Ming-Wei
MW
D000818:Animals; D001522:Behavior, Animal / Q000502:physiology; D001921:Brain / Q000378:metabolism / Q000473:pathology* / Q000503:physiopathology; D002452:Cell Count; D050483:Dopamine Plasma Membrane Transport Proteins / Q000096:biosynthesis; D004777:Environment; D005260:Female; D007150:Immunohistochemistry; D051379:Mice; D009410:Nerve Degeneration / Q000473:pathology; D009474:Neurons / Q000378:metabolism / Q000473:pathology; D020734:Parkinsonian Disorders / Q000209:etiology* / Q000378:metabolism / Q000473:pathology*
D050483:Dopamine Plasma Membrane Transport Proteins