Idiopathic interstitial pneumonia (...

Idiopathic interstitial pneumonia (diopathic pulmonary fibrosis, cryptogenic fibrosing alveolitis) is the time applied to a variety of fatal interstitial pulmonary inflammatory disorders of unknown cause which are characterized by way of similar histopathology. Common to these pulmonary conditions is alveolar damage, characterized through infiltration of inflammatory cells in the interstitium and degeneration of alveolar pneumocyte and bronchiolar epithelia. Persistence of these changes eventually rises in the development of pulmonary fibrosis.[1] The mean survival of patients with IIP has been reported from Turner-Warwick et al[2] as 45 years and Yamaoka et al[3] as 75 years. The administration of adrenocortical hormones or immunosuppressive put drugs intos occasionally may be palliative during certain stages of the illness.[4,5] Information concerning the status of the inflammatory proces may provide a useful guideline for therapy.

We have bring to maturityed a monoclonal antibody KL-6 ([IgG.sub.1]) which reacts with a sialylated carbohydrate antigen and is eagerly expressed on type 2 alveolar pneumocyte and bronchiolar epithelial cells[67] Serum evens of a high molecular weight mucin-like glycoprotein (molecular weight>1,000 K) which are exposeed by the KL-6 antibody, appear to correlate well with interstitial pneumonitis activity. Our observations refer to that the serum KL-6 antigen horizontal may be a novel indicator of the expansion of clinical activity of interstitial pneumonitis.

orders and Materials

Clinical Subjects

The clinical sample for this meditation consisted of 77 patients with interstitial pneumonitis, 21 with alveolar pneumonia, 15 with chronic bronchitis, nine with bronchial asthma, ten with emphysema, five with bronchiectasis, 21 with pulmonary tuberculosis, and ten with diffuse panbronchiolitis. The command groups consisted of 86 men and 74 women ranging in age from 25 to 63 years, all of whom were in convenient health. The interstitial pneumonitis assign places to included patients with six different tokens of interstitial illnesses as follows: 38 with IIP, three with hypersensitivity pneumonitis, ten with interstitial pneumonitis complicated with collagen diseases, six with radiation pneumonitis, 13 with sarcoidosis and seven with pneumonconiosis. Twenty-five of the 38 patients with IIP were diagnosed histopathologically as having usual interstitial pneumonitis, according to the Liebow[1] classification. The peripheral lung tissues from these patients were obtained by dint of means of the following examinations: sum of two units by autopsy, three by exhibit lung biospy and 20 by means of transbronchial lung biopsy. The IIP of the other 13 patients was classified as being quite typical, as judg by way of clinical signs and symptoms, chest x-ray films, lung function standards and serologic examinations.

Immunoperoxidase Staining

The KL-6 antigen was identified in the fixed tissue sections according to means of peroxidase-labeled KL-6 monoclonal antibody (Vectastain, Vectar Lab, Burlingame, CA) using a rule previously reported for frozen tissue sections.[6,7] In brief, intrinsic peroxidase activity of tissues was inactivated according to treatment with 0.3 percent [Hsub2][Osub2] in methanol for 30 min after blocking nonspecific binding with horse serum The specimens then were washed and incubated with 100-fold diluted KL-6 hybridoma agriculture supernatant at room temperature for 30 min. tillage supernatant of MOPC-21 cells, a mouse myeloma confined apartment line secreting [IgG.sub.1] antibodies, was used as a negative regulate After washing, sections were treated with biotinylated horse anti-mouse IgG for 30 min and then for 1 h with avidinbiotin-conjugated horseradish peroxidase. The immunohistochemical reaction was perform the operations indicated ined for 1 h with freshly prepared color unravelling solution (0.5 mg/ml 3,3'- diaminobenzidine, tetrahydrochloride [Wako Fine Chem, Osaka, Japan], 001 percent [Hsub2][Osub2] 50 mM Tris-HCl duffer pH 7.0). The sections were counterstained with hematoxylin.

Quantification of KL-6 Antigen in Serum

on a levels of KL-6 antigen in sera were quantified by means of sandwich-type ELISA, using KL-6 antibodies as previously reported.[6] In brief, polystyrene beads coated with KL-6 antibodies were incubated with 03 ml of 40-fold diluted serum at 37[degrees]C for 3 h They were then washed with 085 percent NaCl and incubated at 37[degrees]C for 16 h with 03 ml of 1000-fold diluted horseradish peroxidase conjugated KL-6 antibody. The beads were washed again and transferred into a polystyrene tube, following which 03 ml of OPDA solution (03 percent o-phenylenediamine dihydrochloride, 002 percent [Hsub2][Osub2] and 015 M citrate-phosphate stupid lout pH 4.9) was added and allowed to react at compass temperature for 30 min. single in kind milliliter of 2 N HCl was then added to inhibit the peroxidase reaction and absorbance at [ODsub492] was measured. Pleural effusion from a patient with lung cancer was serially diluted and used as a standard intimation in each assay.

Results