Intranasal neuropeptide Y1 receptor antagonism improves motor deficits in symptomatic SOD1 ALS mice

Objective: Neuropeptide Y (NPY) is a 36 amino acid peptide widely considered to provide neuroprotection in a range of neurodegenerative diseases. In the fatal motor neuron disease amyotrophic lateral sclerosis (ALS), recent evidence supports a link between NPY and ALS disease processes. The goal of this study was to determine the therapeutic potential and role of NPY in ALS, harnessing the brain-targeted intranasal delivery of the peptide, previously utilised to correct motor and cognitive phenotypes in other neurological conditions. Methods: To confirm the association with clinical disease characteristics, NPY expression was quantified in post-mortem motor cortex tissue of ALS patients and age-matched controls. The effect of NPY on ALS cortical pathophysiology was investigated using slice electrophysiology and multi-electrode array recordings of SOD1(G93A) cortical cultures in vitro. The impact of NPY on ALS disease trajectory was investigated by treating SOD1(G93A) mice intranasally with NPY and selective NPY receptor agonists and antagonists from pre-symptomatic and symptomatic phases of disease. Results: In the human post-mortem ALS motor cortex, we observe a significant increase in NPY expression, which is not present in the somatosensory cortex. In vitro, we demonstrate that NPY can ameliorate ALS hyperexcitability, while brain-targeted nasal delivery of NPY and a selective NPY Y1 receptor antagonist modified survival and motor deficits specifically within the symptomatic phase of the disease in the ALS SOD1(G93A) mouse. Interpretation: Taken together, these findings highlight the capacity for non-invasive brain-targeted interventions in ALS and support antagonism of NPY Y1Rs as a novel strategy to improve ALS motor function.

Automated summary

Objective: The objective of this study was to investigate the therapeutic potential and role of neuropeptide Y (NPY) in amyotrophic lateral sclerosis (ALS). Methods: NPY expression in post-mortem motor cortex tissue of ALS patients and controls was quantified, and the effect of NPY on ALS cortical pathophysiology was examined using in vitro experiments. The impact of NPY on ALS disease trajectory was assessed through intranasal delivery of NPY and selective NPY receptor agonists and antagonists in ALS mouse models. Results: Increased NPY expression was observed in the motor cortex of ALS patients, and NPY was found to ameliorate ALS hyperexcitability in vitro. Intranasal delivery of NPY and NPY receptor modulation improved survival and motor deficits in ALS mice. Interpretation: These findings demonstrate the potential of non-invasive brain-targeted interventions in ALS and suggest NPY Y1R antagonism as a novel strategy to improve ALS motor function.