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Nitric oxide synthase polymorphisms, gene expression and lung function in chronic obstructive pulmonary disease.

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Single nucleotide polymorphisms (SNPs) in nitric oxide synthase (NOS) genes were not linked to chronic obstructive pulmonary disease (COPD) or lung function. However, a specific NOS3 variant (rs1800779) reduced gene and protein expression, impacting various disease states.

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Area of Science:

  • Pulmonary Medicine
  • Genetics
  • Molecular Biology

Background:

  • Nitric oxide (NO) plays a role in lung function, and its dysregulation may contribute to chronic obstructive pulmonary disease (COPD).
  • Nitric oxide synthase (NOS) genes are responsible for NO production and are potential candidates for investigation in COPD pathogenesis.

Purpose of the Study:

  • To investigate the association between single nucleotide polymorphisms (SNPs) in NOS genes (NOS1, NOS2, NOS3) and lung function in the Lung Health Study (LHS).
  • To examine the relationship between a specific NOS3 SNP (rs1800779) and COPD status, lung function, and NOS3 gene/protein expression in lung tissue.

Main Methods:

  • Genotyping of one SNP in each NOS gene (NOS1, NOS2, NOS3) in the LHS cohort and correlation with lung function measures.
  • Association analysis of the NOS3 rs1800779 SNP with COPD and lung function in four independent COPD case-control populations.
  • Measurement of NOS3 mRNA and protein expression in lung tissue from individuals with known rs1800779 genotypes, using immunohistochemistry to localize NOS3.

Main Results:

  • The NOS3 rs1800779 SNP showed a significant association with higher baseline forced expiratory volume in one second (FEV1) in the LHS cohort for combined AG + GG genotypes compared to AA.
  • Lung tissue gene expression and protein levels of NOS3 were significantly lower in individuals with AG + GG genotypes compared to AA.
  • NOS3 protein was localized to the airway epithelium, with higher expression observed in AA genotype individuals compared to AG and GG.

Conclusions:

  • No significant association was found between variants in NOS genes and lung function or COPD status across all study groups.
  • The G allele of the NOS3 rs1800779 polymorphism is associated with decreased NOS3 gene expression and protein levels.
  • These findings suggest potential implications of the rs1800779 polymorphism in various disease states linked to NOS3 function.