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Nitric Oxide Signaling Pathway

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Nucleic acid biosynthesis is a fundamental biochemical process that produces the purine and pyrimidine nucleotides essential for DNA and RNA synthesis. This pathway maintains a balanced nucleotide pool, preventing imbalances that could jeopardize genetic integrity and cellular function. Given the crucial role of nucleotides, their synthesis is tightly regulated to ensure proper cellular homeostasis.Purine BiosynthesisThe biosynthesis of purine nucleotides begins with ribose-5-phosphate, a...

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Hydroxyurea enhances SMN2 gene expression through nitric oxide release.

Cheng Xu1, Xin Chen, Susanna M Grzeschik

  • 1Department of Neurology and Neurological Sciences, Stanford University Medical Center, 300 Pasteur Drive, Stanford, CA 94305-5235, USA.

Neurogenetics
|December 22, 2010
PubMed
Summary

Hydroxyurea increases full-length survivor motor neuron (SMN) gene transcript in spinal muscular atrophy (SMA) cells by releasing nitric oxide (NO). NO donors may also be effective SMA therapeutics.

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Area of Science:

  • Molecular Biology
  • Neuroscience
  • Pharmacology

Background:

  • Small molecules that boost full-length survivor motor neuron (SMN) gene transcripts are potential therapies for spinal muscular atrophy (SMA).
  • Hydroxyurea (HU) has demonstrated an ability to increase full-length SMN transcript levels in SMA patient-derived lymphocytes.

Purpose of the Study:

  • To elucidate the mechanism by which Hydroxyurea (HU) enhances full-length SMN2 gene expression in SMA lymphocytes.
  • To investigate the role of nitric oxide (NO), a key HU metabolite, in modulating SMN2 expression.

Main Methods:

  • Cultured lymphocytes from 18 SMA patients (types I-III) and 2 non-SMA controls were treated with Hydroxyurea (HU) or nitric oxide (NO) donors.
  • Treatments included long-acting NO donors (Deta-NONOate, S-nitrosoglutathione) and short-acting NO donors (3-ethyl-3-(ethylaminoethyl)-1-hydroxy-2-oxo-1-triazene).
  • Effects on full-length SMN2 mRNA levels were assessed using densitometry and quantitative PCR, with co-treatments involving an NO scavenger (2-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl 3-oxide).

Main Results:

  • Hydroxyurea (HU) and three tested NO donors significantly increased full-length SMN2 mRNA levels in SMA cells.
  • The observed increases in SMN2 expression were abrogated by co-treatment with an NO scavenger, confirming NO's role.
  • One short-acting NO donor exhibited reduced efficacy, potentially due to cytotoxicity.

Conclusions:

  • Hydroxyurea (HU) enhances survivor motor neuron 2 (SMN2) gene expression in SMA cells primarily through the release of nitric oxide (NO).
  • Nitric oxide (NO) donors represent a promising therapeutic avenue for spinal muscular atrophy (SMA) treatment.