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Type I and type III are the most abundant collagens in the lung. The aim of our study was to compare type I and III procollagen peptides in sera of sarcoid patients. Sixty eight patients with sarcoidosis were studied (19 with newly recognized disease, 7 with relapsing disease, 15 with chronic disease, and 27 in stable remission). Thirty healthy volunteers served as controls. The levels of procollagen I and III peptides were determined by radioimmunoassay. Angiotensin-converting enzyme (ACE) level was evaluated by means of a colorimetric assay. In patients with newly recognized sarcoidosis, both serum procollagen I and III peptide levels were increased with respect to controls (p=0.0014 and p<0.00001, respectively). There was a poor correlation between levels of procollagen I and III (r=0.26), whereas there was a closer correlation between procollagen III and ACE (r=0.69). Procollagen I peptide level did not identify patients in roentgenological stage III. In conclusion, in patients with newly recognized sarcoidosis there is a significant increase in the serum level of procollagen I peptide. However, procollagen I peptide is not a marker of sarcoid patients with fibrosis, ie. stage III disease. Its clinical usefulness seems to be weaker than that of procollagen III peptide.
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