Physical activity and environmental enrichment regulate the generation of neural precursors in the adult mouse substantia nigra in a dopamine-dependent manner

BMC Neuroscience

Barbara Steiner²  Alexander Storch¹  Andreas Hermann³  Petra Huehnchen²  Anne Lesemann²  Philipp Klaissle² 

[1] German Center for Neurodegenerative Diseases (DZNE), Research Site Dresden, Dresden, 01307, Germany;Department of Neurology, Charité University Medicine Berlin; CCM, Charitéplatz 1, Berlin, 10117, Germany;Department of Neurology; Division of Neurodegenerative Diseases, Dresden University of Technology, Dresden, 01307, Germany

关键词: Substantia nigra;    Oligodendrocytes;    NG2;    Dopamine;    Environmental enrichment;    Physical activity;   

Others  :  1140857
DOI  :  10.1186/1471-2202-13-132

 received in 2012-08-07, accepted in 2012-10-14,  发布年份 2012

【 摘 要 】

Background

Parkinson’s disease is characterized by a continuous loss of neurons within the substantia nigra (SN) leading to a depletion of dopamine. Within the adult SN as a non-neurogenic region, cells with mainly oligodendrocytic precursor characteristics, expressing the neuro-glial antigen-2 (NG2) are continuously generated. Proliferation of these cells is altered in animal models of Parkinson’s disease (PD). Exercise and environmental enrichment re-increase proliferation of NG2⁺ cells in PD models, however, a possible mechanistic role of dopamine for this increase is not completely understood. NG2⁺ cells can differentiate into oligodendrocytes but also into microglia and neurons as observed in vitro suggesting a possible hint for endogenous regenerative capacity of the SN. We investigated the role of dopamine in NG2-generation and differentiation in the adult SN stimulated by physical activity and environmental enrichment.

Results

We used the 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-model for dopamine depletion and analysed newborn cells in the SN at different maturation stages and time points depending on voluntary physical activity, enriched environment and levodopa-treatment. We describe an activity- induced increase of new NG2-positive cells and also mature oligodendrocytes in the SN of healthy mice. Running and enriched environment refused to stimulate NG2-generation and oligodendrogenesis in MPTP-mice, an effect which could be reversed by pharmacological levodopa-induced rescue.

Conclusion

We suggest dopamine being a key regulator for activity-induced generation of NG2-cells and oliogodendrocytes in the SN as a potentially relevant mechanism in endogenous nigral cellular plasticity.

【 授权许可】

   
2012 Klaissle et al.; licensee BioMed Central Ltd.

【 图 表 】

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