CFTR蛋白在鼻息肉和正常下鼻甲黏膜中的表达

目的:探讨囊性纤维跨膜转运调节因子(CFTR)在鼻息肉发病机制中的作用。方法:采用免疫组织化学SP法检测28例慢性鼻窦炎患者鼻息肉组织(鼻息肉组)和7例正常下鼻甲黏膜(下鼻甲组)中CFTR蛋白的表达情况。结果:①CFTR在上述2组组织均有表达,主要表达于上皮细胞和分泌细胞,并且优势表达于鼻息肉。CFTR在正常下鼻甲黏膜呈较为单一的顶上膜表达,而在鼻息肉中呈顶上膜表达和细胞质表达并存;②鼻息肉组CFTR的黏膜上皮阳性细胞顶上膜表达的强度值(1.921±0.310)显著高于下鼻甲组(0.971±0.214)(P<0.05)。鼻息肉组CFTR的上皮阳性细胞质表达的强度值(2.036±0.439)亦显著高于下鼻甲组(0.550±0.366)(P<0.05)。结论:氯离子通道CFTR蛋白的过度表达和异常表达可能在鼻息肉的发病机制中起重要的作用。

Expressions of cystic fibrosis transmembrane conductance regulator in epithelial cells of nasal polyps and normal turbinate mucosae

OBJECTIVE: To investigate the role of cystic fibrosis transmembrane conductance regulator (CFTR) in human nasal polyps. METHOD: CFTR were studied in 28 cases of nasal polyps and 7 cases of normal turbinate mucosae with immunochemistric staining. RESULT: (1) CFTR was detected in the two tissues and localized mainly in epithelial cells and secretory cells. Its staining showed a more prominent feature in nasal polyps than in normal turbinate mucosae. CFTR showed a typical apical distribution in the normal turbinate mucosae whereas, in the nasal polyps, CFTR demonstrated the other pattern of localization comprising cytoplasmic distribution and typical apical location. (2) Both the CFTR staining intensity of apical and cytoplasmic distribution in the epithelial cell layer from nasal polyps were higher than those from turbinates (P < 0.05, P < 0.05 respectively). CONCLUSION: Over expression and dysfunction of the chloride channels CFTR may play a role in the formation of nasal polyps.