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Evaluation of serum KL-6 levels in patients with pulmonary tuberculosis
Y Inoue1, K Nishimura, M Shiode
1Second Department of Internal Medicine, Ehime University School of Medicine, Japan.
Setting:
KL-6, a human MUC-1 mucin preferentially expressed on type II pneumocytes, is a sensitive serum marker for evaluating alveolar damage of interstitial pneumonia and pulmonary fibrosis. Some patients with pulmonary tuberculosis develop severe respiratory dysfunction caused by extensive pulmonary fibrosis, compensatory emphysema and fibrous pleural thickening.
Objective:
To evaluate the clinico-pathological significance of KL-6 in pulmonary tuberculosis.
Design:
Serum KL-6 levels were measured in sera from 57 patients with active pulmonary tuberculosis and 38 healthy controls by a sandwich-type enzyme-linked immunosorbent assay. Immunohistochemistry was performed by an avidin-biotin-peroxidase complex method.
Results:
KL-6 levels were significantly higher in the patients than in the healthy controls (518 +/- 693 [SD] vs 227 +/- 91 U/ml, P < 0.001) and increased significantly according to the extent of pulmonary lesions evaluated by chest X-ray (P < 0.001). There was a significant negative correlation between serum KL-6 levels and % vital capacity (VC) (r = 0.642, P < 0.05). KL-6 was strongly expressed on proliferated type II pneumocytes and cuboidal epithelial cells adjacent to thickened intralobular septa and pleura.
Conclusions:
In pulmonary tuberculosis, serum KL-6 originates from proliferated type II pneumocytes and cuboidal epithelial cells, and is a useful marker presenting the degree and extent of pulmonary fibroproductive lesions.
Insights
Serum KL-6 levels are elevated in pulmonary tuberculosis patients, correlating with disease severity and lung damage. This marker, originating from lung cells, indicates the extent of fibroproductive lesions in tuberculosis.
Area of Science:
- Pulmonary Medicine
- Biomarker Research
- Immunology
Background:
- Pulmonary tuberculosis can cause severe respiratory dysfunction due to extensive lung fibrosis.
- KL-6 (a MUC-1 mucin) is a known marker for alveolar damage in interstitial pneumonia and pulmonary fibrosis.
- The role of KL-6 in pulmonary tuberculosis requires further clinical and pathological evaluation.
Purpose of the Study:
- To assess the clinical and pathological significance of serum KL-6 levels in patients with pulmonary tuberculosis.
- To determine if KL-6 can serve as a marker for the degree and extent of lung damage in tuberculosis.
Main Methods:
- Serum KL-6 levels were quantified in 57 active pulmonary tuberculosis patients and 38 healthy controls using enzyme-linked immunosorbent assay.
- Immunohistochemistry was employed to identify the cellular origin and expression patterns of KL-6.
- Chest X-rays were used to evaluate the extent of pulmonary lesions, and % vital capacity was measured.
Main Results:
- Serum KL-6 levels were significantly higher in tuberculosis patients compared to healthy controls (P < 0.001).
- Higher KL-6 levels correlated with the extent of pulmonary lesions on chest X-ray (P < 0.001).
- A negative correlation was observed between serum KL-6 and % vital capacity (r = 0.642, P < 0.05), indicating impaired lung function.
Conclusions:
- Serum KL-6 in pulmonary tuberculosis originates from proliferated type II pneumocytes and cuboidal epithelial cells.
- KL-6 is a valuable biomarker reflecting the degree and extent of pulmonary fibroproductive lesions in tuberculosis.
- These findings highlight KL-6's potential utility in managing and monitoring lung damage in tuberculosis patients.