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Neurodegenerative disorders are progressive diseases that cause irreversible damage and loss to neurons in specific brain areas. Examples of these disorders include Parkinson's disease, Alzheimer's disease, Multiple Sclerosis (MS), and Amyotrophic Lateral Sclerosis (ALS). These disorders share characteristics such as proteinopathies, selective neuronal vulnerability, and a complex interplay between genetic and environmental factors. The primary therapeutic goal for these conditions is...
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NERP-1 modifications in amyotrophic lateral sclerosis.

B Noli1, G Borghero2, M M Mascia3

  • 1Department of Biomedical Sciences, University of Cagliari, Italy.

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|February 11, 2025
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Summary
This summary is machine-generated.

Neuroendocrine regulatory peptide-1 (NERP-1) levels were elevated in the plasma of all amyotrophic lateral sclerosis (ALS) patients. This finding suggests NERP-1 may serve as a potential blood biomarker for ALS diagnosis.

Keywords:
ALSNERP-1NeurodegenerationOxidative stressVGF peptides

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Area of Science:

  • Neuroscience
  • Biochemistry
  • Biomarker Discovery

Background:

  • VGF peptides, including neuroendocrine regulatory peptides (NERPs), are derived from the human proVGF precursor protein.
  • While some VGF-derived peptides are altered in amyotrophic lateral sclerosis (ALS), the role of NERPs remains less understood.
  • Investigating VGF peptides in ALS is crucial for understanding disease mechanisms and identifying diagnostic markers.

Purpose of the Study:

  • To investigate potential modulations of NERPs and other VGF peptides (NAPP, TPGH) in the plasma of ALS and Parkinson's disease (PD) patients.
  • To explore the role of VGF peptides, specifically NERP-1, in oxidative stress using a motoneuron-like cell line.
  • To identify NERP-1 as a potential blood biomarker for ALS.

Main Methods:

  • Competitive ELISA was employed to measure VGF peptide levels in plasma from ALS patients (initial and advanced stages) and controls.
  • PD patients and controls were included for comparison.
  • A motoneuron-like cell line (NSC34) subjected to oxidative stress (sodium arsenate) was used to study NERP-1 behavior; Western blot and sephadex chromatography identified molecular weight forms.

Main Results:

  • Significantly elevated NERP-1 immunoreactivity was observed in the plasma of all ALS patients compared to controls.
  • No significant alterations in VGF peptides were found in PD patients compared to controls.
  • In SA-stressed NSC34 cells, NERP-1 immunoreactivity decreased intracellularly but increased in the culture medium; NERP-1 addition did not protect cell viability.

Conclusions:

  • NERP-1 is consistently altered in ALS patients' plasma, distinguishing them from controls.
  • NERP-1 does not appear to have a protective role against oxidative stress in the studied cell model.
  • Elevated NERP-1 in plasma suggests its potential as a novel blood biomarker for ALS.