Abstract
Parenchymal lung diseases comprise a wide variety of diseases, with different etiologies, pathogeneses and prognoses. This perspective provides an overview of two different disease types: chronic obstructive pulmonary disease and idiopathic pulmonary fibrosis. Chronic obstructive pulmonary disease, which is related to smoking, is one of the leading causes of chronic morbidity and mortality around the world, being characterized by airway obstruction and parenchymal lung damage (emphysema). Idiopathic pulmonary fibrosis of unknown etiology is classified as one of the most important idiopathic interstitial pneumonias and is connected to patchy but progressive lung fibrosis. Both diseases are generally diagnosed late and respond poorly to medical therapies. Although numerous biomarkers have been proposed for these diseases, they have not been validated or implemented into clinical practice. This perspective emphasizes some typical features of these diseases with different types of lung damage, how they are reflected in different samples, as well as potential advances and problems of current and future nonbiased proteomic approaches.
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