Abstract
Parkinson’s disease (PD) is characterized by a progressive degeneration of dopamine (DA) neurons and gradual worsening of motor symptoms. The investigation of progressive degenerative mechanisms and potential neuroprotective strategies relies on experimental models of the chronic neuropathology observed in human. The present study investigated the progressive nature of neurodegeneration in the 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine/probenecid (MPTPp) chronic mouse model of PD. MPTP (25 mg/kg) plus probenecid (250 mg/kg) were administered twice a week for 5 weeks. We evaluated behavioral deficits (olfactory and motor impairment), neurodegeneration (loss of tyrosine hydroxylase (TH)-positive cells in the substantia nigra pars compacta, SNc), biochemical markers of functional impairment in the caudate-putamen (CPu) (striatal enkephalin mRNA, DA and DOPAC levels), and glial reactivity (CD11b and GFAP immunoreactivity in the SNc and CPu) at progressive time-points (after 1, 3, 7, and 10 administrations of MPTPp). Olfactory dysfunction already appeared after the 1st MPTPp injection, whereas motor dysfunction appeared after the 3rd and worsened upon subsequent administrations. Moreover, starting after three MPTPp injections, we observed a gradual decline of TH-positive cells in the SNc, and a gradual raise of enkephalin mRNA in the CPu. Striatal DA levels reduction was not different among all time-points evaluated, whereas DOPAC levels were similarly reduced after 1–7 MPTP injections, but were further decreased after the 10th injection. Reactive microglia and astroglia were observed in both the SNc and CPu from the 1st MPTPp administration. In the SNc, gliosis displayed a gradual increase over the treatment. After 2 months, TH, DA, DOPAC, and reactive glia in the SNc were still altered in MPTPp-treated mice as compared to controls. By showing a progressive development of behavioral deficits and nigral neurodegeneration, together with impairment of biochemical parameters and gradual increase of glial response, results suggest that the chronic MPTPp protocol is a model of progressive PD, which may be suitable to investigate chronic pathological processes and neuroprotective strategies in PD.
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Nicoletta Schintu and Lucia Frau equally contributed to the work.
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Schintu, N., Frau, L., Ibba, M. et al. Progressive Dopaminergic Degeneration in the Chronic MPTPp Mouse Model of Parkinson’s Disease. Neurotox Res 16, 127–139 (2009). https://doi.org/10.1007/s12640-009-9061-x
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DOI: https://doi.org/10.1007/s12640-009-9061-x