PTX3在角膜上皮抗真菌固有免疫階段作用的研究
[Abstract]:Objective: (1) to study the expression and regularity of PTX3 in the antifungal inherent immunity of corneal epithelium. (2) whether the Dectin-1/Syk and MAPKs signaling pathways are involved in the regulation of the expression of PTX3 in the corneal epithelium. (3) to explore the role of endogenous PTX3 in the anti fungal inherent immunity of corneal epithelium and its possible mechanism. Methods: This study was divided into three parts. We studied the expression of PTX3 in the fungal keratitis model and human corneal epithelial cells cultured in vitro respectively. The expression of PTX3 after fungal infection was investigated. The expression of PTX3 mRNA was detected by fluorescence quantitative PCR, and the expression of PTX3 protein was detected by immunohistochemistry or Western Blot. (1) May 2013 The corneal epithelial tissue surrounding the cornea of the focus was collected as an infection group, and the remaining peripheral skin tissue of the cornea was made as normal control. The angle of the cornea was detected in the cornea of the eye department of the Affiliated Hospital of Qiingdao University in October 2015. The expression of PTX3 mRNA and protein in the infection of Aspergillus fumigatus before and after infection of Aspergillus fumigatus, the expression of PTX3 protein in human corneal tissue was located by immunohistochemical staining. Meanwhile, the samples were grouped according to the degree of inflammatory reaction of corneal ulcer (mild, moderate, severe), and the inflammatory response of different degrees after PTX3 and fungal infection was analyzed and compared. (2) 50 healthy Wistar rats were randomly divided into 3 groups: the blank control group, the damage control group and the fungal infection group, the corneal epithelium was scraped to detect the difference in the expression of PTX3 at the level of mRNA and protein. (3) the inactivated Aspergillus fumigatus spores antigen was used to stimulate in vitro culture in vitro. Cultured HCECs, establish an in vitro model of Aspergillus fumigatus infection, detect the expression of PTX3 at gene and protein levels after different times of stimulation of Aspergillus fumigatus. Two, select the most significant time points of PTX3 gene and protein expression (4h and 8h) under the stimulation of Aspergillus fumigatus (4h and 8h), Laminarin (Dectin-1 blocker), Piceatannol (Syk inhibitor), SB20, respectively. 3580 (p38MAPK inhibitor), U0126-Et OH (MEK inhibitor) and SP600125 (JNK inhibitor) pretreated HCECs, adding inactivated Aspergillus fumigatus spores antigen suspension to explore whether Dectin-1/Syk and MAPK signaling pathways were involved in the expression and regulation of PTX3. Three, PTX3 was induced in the inherent immune process of Aspergillus fumigatus in the upper cornea. In human corneal epithelial cells cultured in vitro, PTX3 siRNA pretreated HCECs to block endogenous PTX3 production, and then co culture with Aspergillus fumigatus spores. Western Blot was used to detect the changes in the total amount of MAPKs protein and phosphorylation level of the inflammatory signaling pathway molecules, and the fluorescence determination PCR and enzyme linked immunosorbent assay (ELISA) were detected respectively. The expression of terminal inflammatory factor IL-1 beta at the level of mRNA and protein to understand the mechanism of endogenous PTX3 affecting the antifungal inherent immunity of corneal epithelium. Results: (1) normal people, corneal epithelium and cultured corneal epithelial cells in vitro can express PTX3. light, and the expression of PTX3 mRNA in the corneal epithelium of the patients with recombinant fungal keratitis is more positive. The higher the degree of keratitis, the higher the degree of keratitis, the higher the expression of PTX3 (p0.001). In the rat model of Aspergillus fumigatus infection, the expression of PTX3 mRNA and protein in the corneal epithelium at the peak of 16h was higher than that of the normal control group and the damage control group (P0.05, p0.001). The corneal epithelial cells cultured in vitro were in vitro. The spore stimulation of Aspergillus fumigatus can increase the expression of PTX3, and its mRNA and protein at 4H and 8h peak (p0.001). (2) using piceatannol, U0126-EtOH, SP600125 to inhibit Syk, MEK, JNK can reduce the production of Aspergillus fumigatus induced by Aspergillus fumigatus. There was no significant effect of PTX3 (P0.05). (3) siRNA blocking endogenous PTX3 can down regulate the expression of IL-1 beta in corneal epithelial cells (p0.001) and decrease the phosphorylation level of ERK1/2 and JNK protein in MAPK pathway (p0.001), but there is no significant effect on the phosphorylation level of p38 MAPK protein and the expression level of total protein. PTX3 is an important part of the immunity of corneal epithelia against Aspergillus fumigatus. It can reflect the degree of inflammation of.Syk. MEK1/2 and JNK are the target.PTX3 that regulate the expression of PTX3 in corneal epithelium stimulated by Aspergillus fumigatus. The effect of anti Aspergillus fumigatus can be played by promoting the inflammatory reaction of corneal epithelium.
【學(xué)位授予單位】:青島大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2016
【分類號】:R772.2
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