Abstract
The transduction of dopaminergic (DA) neurons with human ras homolog enriched in brain, which has a S16H mutation [hRheb(S16H)] protects the nigrostriatal DA projection in the 6-hydroxydopamine (6-OHDA)-treated animal model of Parkinson’s disease (PD). However, it is still unclear whether the expression of active hRheb induces the production of neurotrophic factors such as glial cell line-derived neurotrophic factor (GDNF) and brain-derived neurotrophic factor (BDNF), which are involved in neuroprotection, in mature neurons. Here, we show that transduction of nigral DA neurons with hRheb(S16H) significantly increases the levels of phospho-cyclic adenosine monophosphate (cAMP) response element-binding protein (p-CREB), GDNF, and BDNF in neurons, which are attenuated by rapamycin, a specific inhibitor of mammalian target of rapamycin complex 1 (mTORC1). Moreover, treatment with specific neutralizing antibodies for GDNF and BDNF reduced the protective effects of hRheb(S16H) against 1-methyl-4-phenylpyridinium (MPP+)-induced neurotoxicity. These results show that activation of hRheb/mTORC1 signaling pathway could impart to DA neurons the important ability to continuously produce GDNF and BDNF as therapeutic agents against PD.
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Abbreviations
- 6-OHDA:
-
6-Hydroxydopamine
- AAV1:
-
Adeno-associated virus 1
- ANOVA:
-
Analysis of variance
- AP:
-
Anterior-posterior
- BDNF:
-
Brain-derived neurotrophic factor
- DA:
-
Dopaminergic
- DAPI:
-
4′,6-Diamidino-2-phenylindole
- DV:
-
Dorsal-ventral
- FLAG:
-
FLAG-tag
- GDNF:
-
Glial cell line-derived neurotrophic factor
- GFAP:
-
Glial fibrillary acidic protein
- GFP:
-
Green fluorescent protein
- hRheb(S16H):
-
Human Ras homolog enriched in brain with a S16H mutation
- ip:
-
Immunopositive
- MFB:
-
Medial forebrain bundle
- ML:
-
Medial-lateral
- MPP+ :
-
1-Methyl-4-phenylpyridinium
- mTORC1:
-
Mammalian target of rapamycin complex 1
- p-CREB:
-
Phospho-cAMP response element binding protein
- PBS:
-
Phosphate-buffered saline
- PD:
-
Parkinson’s disease
- SD:
-
Sprague-Dawley
- SN:
-
Substantia nigra
- SNpc:
-
Substantia nigra pars compacta
- STR:
-
Striatum
- TH:
-
Tyrosine hydroxylase
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Acknowledgments
This research was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (Nos. 2008-0061888 and 2012R1A1A1039140).
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The authors declare no conflicts of interest.
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Jin Han Nam Eunju Leem and Min-Tae Jeon contributed equally to this work.
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Nam, J.H., Leem, E., Jeon, MT. et al. Induction of GDNF and BDNF by hRheb(S16H) Transduction of SNpc Neurons: Neuroprotective Mechanisms of hRheb(S16H) in a Model of Parkinson’s Disease. Mol Neurobiol 51, 487–499 (2015). https://doi.org/10.1007/s12035-014-8729-2
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DOI: https://doi.org/10.1007/s12035-014-8729-2