[Expression of prostacyclin receptor in chronic rhinosinusitis and its relationship with type 2 inflammation].

<b>Objective:</b>The purpose of this study is to explore the expression of prostacyclin receptor（IP） in patients with chronic rhinosinusitis（CRS） and its possible association with type 2 inflammation. <b>Methods:</b>HE staining was used to observe the morphological changes of nasal mucosa, qRT-PCR was used to detect the expression of IP in polyps and nasal mucosa, and IHC was used to detect the expression of IP, IL-4, IL-5 and IL-13 in polyps and nasal mucosa. <b>Results:</b>Compared with the control group, the nasal mucosa of patients with various types of CRS was obviously thickened, accompanied by inflammatory cell infiltration and gland hyperplasia. The statistical results of IHC showed that the expression levels of IL-4, IL-5 and IL-13 in CRS group were significantly higher than those in control group（<i>P</i><0.05）, and the IP expression in control group was significantly higher than that in ECRS group and non-ECRS group（<i>P</i><0.05）. The IP expression in ECRS group was negatively correlated with IL-4, IL-5 and IL-13. The results of qRT-PCR showed that the expression of IP mRNA in control group was significantly higher than that in ECRS group and non-ECRS group（<i>P</i><0.05）. <b>Conclusion:</b>IL-4, IL-5 and IL-13 are highly expressed in the nasal mucosa of CRS patients, while IP is poorly expressed in the nasal mucosa of CRS patients, and IP is negatively correlated with IL-4, IL-5 and IL-13, suggesting that IP is related to the occurrence and development of type 2 inflammation and may be a potential therapeutic target for CRS patients.