Toll樣受體介導(dǎo)的TSLP在過(guò)敏性結(jié)膜炎中的作用和調(diào)控機(jī)制研究
[Abstract]:AIM: To investigate the role of Toll-like receptor (TLR)-mediated thymic stromal lymphopoietin (TSLP) and its downstream signal molecule OX40L/OX40 in allergic conjunctivitis.
Methods: Three different types of allergic models were established in this study. The experiment was divided into three parts. 1. Pollen-induced conjunctivitis in mice: wild-type BALB/C mice, TLR4 gene-deficient mice, Myd88+/+ and Myd88-/-mice based on C 57BL/6, and whole-body sensitization with pollen on the first day of the model, respectively. Pollen-induced TSLP expression in corneal epithelium, conjunctival epithelium and cervical sensitized lymph nodes was detected by qPCR, immunohistochemical staining and immunofluorescence. 2. Pollen-induced TSLP induction model of local ocular surface in mice: wild-type BALB/C mice, TLR4 Gene-deficient mice; Myd88+/+and Myd88-/-mice based on C57BL/6; local eye surface stimulation with pollen was performed for 4-24 hours directly. The expression of TSLP in corneal and conjunctival epithelium of mice was detected by qPCR and ELISA. 3. Pollen-induced TSLP induction model of human corneal epithelial cells: human corneal epithelial cells were cultured in vitro and given to the mice respectively. The expression of TSLP was detected by qPCR and ELISA after different concentrations of pollen stimulation and pretreatment with TLR4 antibody and NF-K b-I.
Results: 1. pollen induced allergic conjunctivitis models in mice:
(1) In BALB/C mice with allergic conjunctivitis, the expression of TSLP, TSLP downstream pathway factors (TSLPR, OX40L, OX40, CD11C, CD4) and Th2 cytokines (IL-4.IL-5, IL-13) in corneal epithelium, conjunctival epithelium and cervical sensitized lymph nodes were increased, while the expression of Thl cytokine IFN-gamma was increased, compared with PBS control group. The immunohistochemical staining confirmed this change at the protein level.
(2) In BALB/C mice and TLR4-deficient mice, the expression of TSLP, TSLP downstream pathway factors and Th2 cytokines in corneal epithelium, conjunctival epithelium and cervical sensitized lymph nodes of TLR4-deficient mice were decreased by qPCR compared with BALB/C mice. Immunofluorescence staining of chromatic and lymph nodes confirmed this change at protein level.
(3) The expression of TSLP, TSLP downstream pathway factors and Th2 cytokines in corneal epithelium, conjunctival epithelium and cervical sensitized lymph nodes in Myd88 + / + mice were increased by qPCR compared with Myd88 + + PBS control group. The expression of these cytokines was also significantly higher than that in Myd88 - / - allergic model. Immunohistochemical staining of the eyeballs and immunofluorescence staining of the lymph nodes of the model mice at protein level confirmed these changes.
2. pollen induced local ocular surface TSLP induced model in mice:
1) Compared with PBS control group, the expression of TSLP in corneal epithelium and conjunctival epithelium of BALB/C mice increased after direct pollen stimulation. Pretreatment with TLR4 antibody inhibited the stimulation of pollen to TSLP. These changes were confirmed at protein level by ELISA.
2) Compared with BALB/C mice, TSLP expression in corneal epithelium and conjunctival epithelium was decreased in TLR4 deficient stimulation group. Compared with Myd88+/+ mice, TSLP expression in corneal epithelium and conjunctival epithelium was also decreased in Myd88-/-pollen stimulation group. Change.
3. pollen induced TSLP model of human corneal epithelial cells:
In cultured human corneal epithelial cells, the expression of TSLP was induced by pollen in a concentration-dependent manner. TLR4 antibody or NF-K b-I inhibited the stimulation of pollen on TSLP. These changes were confirmed at protein level by ELISA.
Conclusion: 1.TSLP and its downstream pathway factors play an important role in the pathogenesis of allergic conjunctivitis.
2. In allergic conjunctivitis induced by pollen, the external allergens can induce the expression of TSLP and related signaling molecules in epithelial cells through the TLR4/Myd88 signaling pathway, and then induce Th2 inflammation.
3. Artificial blockade of TLR4, Myd88 and other key sites can inhibit pollen-induced allergic reactions, reduce the expression of TSLP and related Th2 cytokines, which may become a new therapeutic target in clinic.
【學(xué)位授予單位】:青島大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2013
【分類(lèi)號(hào)】:R777.31
【共引文獻(xiàn)】
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