短期口服糖皮质激素对慢性鼻窦炎伴鼻息肉上皮紧密连接的影响

Effect of short course oral glucocorticoids on topical expression of tight junction in chronic rhinosinusitis with nasal polyp

目的观察短疗程口服糖皮质激素(glucocorticoids,GCs)对慢性鼻窦炎伴鼻息肉(CRSwNP)上皮中紧密连接(tight junctions,TJs)表达水平的影响。方法招募拟行鼻内镜手术治疗的CRSwNP患者,术前给予GCs口服连续7 d,分别留取治疗前、后的鼻息肉组织。选取因非炎性疾病而拟行相关鼻内镜手术的成年患者,留取术中所得到的钩突黏膜、中鼻甲黏膜或下鼻甲黏膜作为对照。应用实时荧光定量PCR和免疫荧光共聚焦显微镜检测TJs的表达情况。结果短疗程口服GCs治疗前,鼻息肉标本中claudin-3、claudin-4和occludin mRNA的表达水平显著低于正常鼻黏膜;治疗后,鼻息肉组织中TJs mRNA和蛋白的表达水平较治疗前显著升高。结论鼻息肉组织中多种TJs表达下降,短期口服GCs治疗可以显著上调TJs的表达。

OBJECTIVE To observe the effect of a short course of oral glucocorticoids(GCs)on the expression level of tight junctions(TJs)in the epithelium of nasal polyps.METHODS Patients with chronic rhinosinusitis with nasal polyps(CRSwNP)who were hospitalized for nasal endoscopic surgery were recruited and given oral GCs for 7 consecutive days before surgery.Nasal polyp tissues were harvested before and after GCs treatment respectively.Adult patients who were to undergo nasal endoscopic surgery due to non-inflammatory diseases were selected,and the mucosa of the middle turbinates,inferior turbinates,or uncinate process obtained during surgery was retained as normal controls.Real-time PCR and immunofluorescence confocal microscopy were used to detect the expression of TJs.RESULTS Before oral GCs therapy,the mRNA expression levels of claudin-3,claudin-4,and occludin in nasal polyp specimens were significantly lower than that of normal nasal mucosa.After a short course of oral GCs therapy,the mRNA expression levels of claudin-3 and claudin-4 in nasal polyp specimens were significantly higher than those before treatment.After oral GCs treatment,the protein expression levels of claudin-1 and claudin-4 in nasal polyp tissues were significantly higher than those before treatment.CONCLUSION Compared with normal nasal mucosa,the expression of multiple tight junction proteins in the epithelium of nasal polyps decreases.Short-term oral GCs therapy can significantly up-regulate the expression of tight junction proteins.