各種間質性肺疾患における BAL 液並びに肺組織中 T-cell subset の検討

The cellular components in bronchoalveolar lavage fluids (BALF) and biopsied lung tissues of patients with various types of interstitial pneumonia were analyzed to clarify cellular kinetics in the lung. The T-cell subsets of lymphocytes in BALF and biopsied lung tissues were examined in 7 cases of hypersensitivity pneumonitis (HP), 2 cases of sarcoidosis (Sar), one case of idiopathic interstitial pneumonia (IIP) and 2 cases of rheumatoid arthritis with interstitial pneumonia (RA+IP). The T-cell subsets in BALF were analyzed by flow cytometry and the T-cell subsets in lung tissue were detected in frsh frozen and thin-sliced specimens using an avidine-biotine complex (ABC) kit. The mean CD4/CD8 ratio in BALF was 0.36 in HP, 3.1 in Sar, 1.07 in IIP and 2.59 in RA+IP, while the mean CD4/CD8 ratio in lung tissues was 0.52 in HP, 2.59 in Sar, 1.11 in IIP and 2.25 in RA+IP, respectively. The ratios of CD4/CD8 in BALF and lung tissues from patients with these various interstitial pneumonia showed a positive correlation. Significant correlation was seen between CD4/CD8 rations of the alveolar portion findings indicate that BAF findings reflect the changes in the lung tissues, although BALF might reflect only a part of the changes in the whole lung.

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