A study of the expression of CD44 in pneumocytes in pulmonary sarcoidosis

目的探讨肺结节病的肺泡Ⅱ型细胞CD44的表达与其发病机制的关系.方法对21例肺结节病、5例结核病、3例Wegener肉芽肿、4例特发性肺纤维化和8份正常肺组织行活组织检查,行肺泡上皮总数(AE1/AE3)和CD44的免疫组化染色.3个显微镜高倍视野为观察范围,以AE1/AE3标记阳性细胞即肺泡上皮总数为基数,观察肺泡上皮的CD44阳性细胞数、以及肺泡上皮总数和CD44的计数比率.结果结节病组的肺泡上皮总数为110±32,肺泡上皮CD44的计数为84±6,与正常组的肺泡上皮总数(70±17)和CD44计数(18±4)比较,差异有显著性(P<0.001).CD44阳性表达于肺泡上皮膜上,且以肺泡Ⅱ型细胞为主.结论结节病时肺泡上皮细胞增多,伴有肺泡上皮细胞膜的CD44高表达,且以Ⅱ型细胞为主,此变化在结节病的炎症反应和修复过程中起着重要的作用.To study the expression of CD(44) in pneumocytes in pulmonary sarcoidosis.CD(44) and AE(1)/AE(3) were detected by immunostaining in lung tissues from 21 cases of pulmonary sarcoidosis, 5 cases of tuberculosis, 4 cases of idiopathic interstitial fibrosis, 3 cases of Wegener's granulomatosis and 8 normal controls. The numbers of CD(44) positive cells and AE(1)/AE(3) positive cells (total alveolar epithelial cells) per three high-power fields were counted, and the ratio of CD(44) cells to AE(1)/AE(3) cells (84 +/- 6) were calculated.The total number of alveolar epithelial cells (110 +/- 32) and the density of CD(44) cells were significantly higher in sarcoidosis than in the normal lungs. CD(44) (18 +/- 4) staining was localized in the pneumocyte membrane and the positive cells were mostly type II pneumocytes as confirmed by histology.Proliferation of pneumocytes and increased expression of CD(44) in pneumocyte membrane, especially in the type II pneumocytes, may play an important role in lung inflammation and repair in pulmonary sarcoidosis.PubMed中文核心期刊要目总览(PKU)中国科学引文数据库(CSCD)010613-6162