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Jul 12, 2023Keywords:
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Main Article Content
Expressions and significance of 25 (OH) D, KL-6 and IL-32 in serum and alveolar lavage fluid in patients with connective tissue disease-related interstitial lung disease
Abstract
Purpose: To investigate the expressions and significance of 25 hydroxyvitamin D [25(OH)D3], Krebs von den Lungen (KL)-6, and interleukin (IL)-32 in serum and alveolar lavage fluid (SALF) in patients with connective tissue disease-related interstitial lung disease (CTD-ILD).
Methods: Forty CTD-ILD patients admitted to Affiliated Hospital of Jianghan University (The Sixth Hospital of Wuhan) were retrospectively categorized into a study group (SG), while 45 healthy individuals were categorized into a control group (CG). The SG was grouped based on the imaging performance of the high-resolution computed tomography (HRCT). If the lesions were ground-glass-like
changes, featuring predominant exudative changes in spots and patchy shadows, the patients were placed in subgroup A of the study group, but if they were fibrous cord-like, grid-like, and honeycomb-like fibrotic lesions, the patients were placed in subgroup B of study group.
Results: Serum 25(OH)D3 in the SG was lower than in the CG, while the serum levels of KL-6 and IL32 were higher than in CG. Furthermore, in the SG, KL-6 and IL-32 levels were lower in serum than in alveolar lavage fluid (p < 0.05). Sub-group A showed higher SALF levels in KL-6 and IL-32 than subgroup B. Forced vital capacity (FVC) and the diffusing capacity of the lungs for carbon monoxide (DLCO) in SG were lower than in CG (p < 0.05). Serum 25(OH)D3 had negative correlation with the SALF of KL-6 and IL-32 in CTD-ILD patients (p < 0.05), while KL-6 and IL-32 levels in serum were positively correlated with those in alveolar lavage fluid (p < 0.05).
Conclusion: The results indicate the possible involvement of 25(OH)D3, KL-6, and IL-32 in the development of CTD-ILD. Thus, serum 25(OH)D3, SALF KL-6, and IL-32 levels may affect lung function and therefore, can serve as indicators of the patients' condition.
