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5‐HT 1F receptor‐mediated mitochondrial biogenesis for the treatment of Parkinson's disease
Author(s) -
Scholpa Natalie E,
Lynn Mary K,
Corum Daniel,
Boger Heather A,
Schnellmann Rick G
Publication year - 2018
Publication title -
british journal of pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.432
H-Index - 211
eISSN - 1476-5381
pISSN - 0007-1188
DOI - 10.1111/bph.14076
Subject(s) - substantia nigra , dopaminergic , tyrosine hydroxylase , mitochondrial biogenesis , striatum , medicine , oxidopamine , endocrinology , parkinson's disease , lesion , dopamine , biology , neuroscience , mitochondrion , pathology , disease , microbiology and biotechnology
Background and Purpose Parkinson's disease is characterized by progressive decline in motor function due to degeneration of nigrostriatal dopaminergic neurons, as well as other deficits including cognitive impairment and behavioural abnormalities. Mitochondrial dysfunction, leading to loss of ATP‐dependent cellular functions, calcium overload, excitotoxicity and oxidative stress, is implicated in the pathophysiology of Parkinson's disease. Using the 5‐HT 1F receptor agonist LY344864, a known inducer of mitochondrial biogenesis (MB), we investigated the therapeutic efficacy of stimulating MB on dopaminergic neuron loss in a mouse model of Parkinson's disease. Experimental Approach Male C57BL/6 mice underwent bilateral intrastriatal 6‐hydroxydopamine or saline injections and daily treatment with 2 mg·kg −1 LY344864 or vehicle for 14 days beginning 7 days post‐lesion. Tyrosine hydroxylase immunoreactivity (TH‐ir) and MB were assessed in the brains of all groups following treatment, and locomotor activity was evaluated prior to lesioning, 7 days post‐lesion and after treatment. Key Results Increased mitochondrial DNA content and nuclear‐ and mitochondrial‐encoded mRNA and protein expression was observed in specific brain regions of LY344864‐treated naïve and lesioned mice, indicating augmented MB. LY344864 attenuated TH‐ir loss in the striatum and substantia nigra compared to vehicle‐treated lesioned animals. LY344864 treatment also increased locomotor activity in 6‐hydroxydopamine lesioned mice, while vehicle treatment had no effect. Conclusions and Implications These data revealed that LY344864‐induced MB attenuates dopaminergic neuron loss and improves behavioural endpoints in this model. We suggest that stimulating MB may be beneficial for the treatment of Parkinson's disease and that the 5‐HT 1F receptor may be an effective therapeutic target.