Serum methylarginines and spirometry-measured lung function in older adults

Area of Science:

• Pulmonary Medicine
• Biochemistry
• Gerontology

Background:

• Methylarginines, nitric oxide synthase inhibitors, are implicated in animal lung disease models.
• Their association with human lung function measures remains under-examined.

Purpose of the Study:

• To measure serum concentrations of asymmetric and symmetric dimethylarginine in older adults.
• To determine the association between these methylarginines and spirometric lung function.

Main Methods:

• Utilized LC-MS/MS to measure serum L-arginine and methylated arginines in a population-based sample of older Australian adults.
• Assessed five key spirometric measures: FEV1, FVC, FEV1/FVC ratio, %Pred FEV1, and %Pred FVC.
• Collected data on clinical, lifestyle, and demographic characteristics.

Main Results:

• Higher asymmetric dimethylarginine showed independent associations with lower FEV1 and FVC.
• A lower L-arginine/asymmetric dimethylarginine ratio was linked to reduced FEV1, %Pred FEV1, and %Pred FVC.
• No significant associations were found between symmetric dimethylarginine and lung function.

Conclusions:

• Elevated serum asymmetric dimethylarginine is independently associated with diminished lung function in older adults.
• Further investigation is required to ascertain if methylarginines predict future lung function decline.