Blockade of PrRP attenuates MPTP-induced toxicity in mice.
Prolactin-releasing peptide (PrRP) was isolated as an endogenous ligand of the orphan G-protein coupled receptor hGR3. PrRP has been shown to be involved in the regulation of food intake, stress responses, prolactin secretion and release, blood pressure, and the opioid system. Here we report that PrRP and its receptor, GPR10, were found in the mouse substantia nigra pars compacta (SNpc), the main location of dopaminergic (DA) neurons of the nigrostriatal system. We generated PrRP knockout (KO) mice, and then treated PrRP KO mice and their wild type (WT) littermates with 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP), a neuron toxin that selectively damages DA neurons in the SNpc. We found that PrRP KO mice were resistant to MPTP-induced lesions of the nigrostriatal system. These effects were further confirmed by the intracerebroventricular injection of P2L-1C, a monoclonal antibody against PrRP into mice. Taken together, our data established a critical role of PrRP in MPTP intoxication in mice.
Sun
Binggui
B
Department of Regulation Biology, Faculty of Science, Saitama University, 255 Shimo-ohkubo, Sakura-ku, Saitama 338-8570, Japan. bsun@gladstone.ucsf.edu
Mochiduki
Akikazu
A
Nakamura
Kimie
K
Yokoyama
Kotaro
K
Adachi
Sachika
S
Fujiwara
Ken
K
Matsumoto
Hirokazu
H
Inoue
Kinji
K
D015632:1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine / Q000494:pharmacology; D000818:Animals; D000911:Antibodies, Monoclonal / Q000008:administration & dosage / Q000494:pharmacology; D015153:Blotting, Western; D001921:Brain / Q000187:drug effects / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid; D004298:Dopamine / Q000378:metabolism; D007028:Hypothalamic Hormones / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D007150:Immunohistochemistry; D017403:In Situ Hybridization; D020267:MPTP Poisoning / Q000378:metabolism*; D008297:Male; D051379:Mice; D018345:Mice, Knockout; D009498:Neurotoxins / Q000494:pharmacology; D056690:Prolactin-Releasing Hormone; D043562:Receptors, G-Protein-Coupled / Q000378:metabolism; D013378:Substantia Nigra / Q000187:drug effects / Q000378:metabolism
D000911:Antibodies, Monoclonal; D007028:Hypothalamic Hormones; D009498:Neurotoxins; C534378:Prlh protein, mouse; C487625:Prlhr protein, mouse; D056690:Prolactin-Releasing Hormone; D043562:Receptors, G-Protein-Coupled; D015632:1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine; D004298:Dopamine