Modelling Parkinson‐like neurodegeneration via osmotic minipump delivery of MPTP and probenecid

• Published in: Journal of neurochemistry 2008-11, Vol.107 (3), p.701-711
• Main Authors: Alvarez‐Fischer, Daniel, Guerreiro, Serge, Hunot, Stéphane, Saurini, Françoise, Marien, Marc, Sokoloff, Pierre, Hirsch, Etienne C., Hartmann, Andreas, Michel, Patrick P.
• Format: Article
• Language: English
• Subjects: 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine - administration & dosage; Adjuvants, Pharmaceutic - administration & dosage; Animals; Biochemistry; Biological and medical sciences; Brain - drug effects; Brain - pathology; Cardiology. Vascular system; Chromatography, High Pressure Liquid; Coronary heart disease; Degenerative and inherited degenerative diseases of the nervous system. Leukodystrophies. Prion diseases; Disease Models, Animal; Dopamine - analysis; Dopamine - metabolism; dopaminergic (DA) neurons; Heart; Immunohistochemistry; Infusion Pumps; Male; Medical sciences; Mice; Mice, Inbred C57BL; microgliosis; MPTP; Nerve Degeneration - chemically induced; neurodegeneration; Neurology; Neurotoxins - administration & dosage; Neurotransmitters; osmotic minipumps; Parkinson; Parkinson's disease; Parkinsonian Disorders - chemically induced; Probenecid - administration & dosage; Rodents
• ISSN: 0022-3042; 1471-4159
• DOI: 10.1111/j.1471-4159.2008.05651.x

Mouse models of MPTP intoxication have been used extensively to explore the molecular mechanisms of Parkinson’s disease. However, these models present some limitations since; (i) Dopaminergic (DA) cell death occurs rapidly in contrast to the presumably slow evolution of the disease process. (ii) Some of the key histological features of the disease such as Lewy body like inclusions and long‐term inflammatory changes are lacking. Fornai et al. [Proc. Natl Acad. Sci. USA 102 (2005), 3413] suggested that continuous delivery of MPTP with Alzet osmotic minipumps may possibly circumvent these problems. Our results show, however, that MPTP infusion via Alzet osmotic minipumps (40 mg/kg/day) produces only a transient depletion in striatal dopamine (DA) without causing dopaminergic cell loss in the substantia nigra. Neuronal cell loss occurred, however, if MPTP was infused concomitantly with probenecid, an uricosuric agent which potentiates the effects of the toxin injected via the i.p. route. Even under these conditions, dopaminergic cell loss was moderate (−25%) and other neurodegenerative changes characteristic of Parkinson’s disease remained undetectable.