Abstract
IgG4-related sialadenitis (IgG4-RS) is a chronic fibro-inflammatory disease characterized by swelling of salivary glands and varying degrees of xerostomia. Tight junctions (TJs) play an essential role in maintaining secretory function by regulating the paracellular flow of ions and water. However, whether TJs are altered and contribute to the hyposecretion in IgG4-RS is not fully understood. Here, a total of 399 differentially expressed proteins were identified in IgG4-RS submandibular glands (SMGs) and enriched in the regulation of actin cytoskeleton and the salivary secretion. Real-time PCR results showed that the mRNA levels of claudin-3, -4, -6, -7, -8, -10, -12, occludin, and ZO-1 were significantly lower, whereas claudin-1 and -5 were higher in IgG4-RS SMGs. Immunohistochemical and immunofluorescence staining revealed that claudin-1, -3, -4, occludin, and ZO-1 were mainly distributed at apicolateral membranes in acini and ducts of SMGs from controls, whereas claudin-1 protein intensity at apicolateral membrane was elevated, while the staining of claudin-3, -4, and ZO-1 were reduced in IgG4-RS SMGs. Occludin was dispersed into cytoplasm of acini and ducts in SMGs of patients. Among them, claudin-3 and ZO-1 protein levels were positively correlated with saliva flow rate. Furthermore, the decreased fluorescence intensity of F-actin at peri-apicolateral membranes and the loss of ZO-1 staining at the same location were observed in acinar and ductal cells of IgG4-RS SMGs, which might be responsible for disorganization of TJ complex. Taken together, these findings indicate that the integrity of TJ complex of SMGs is impaired and might contribute to hyposalivation of IgG4-RS patients.
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This work was funded by the National Natural Science Foundation of China 81671005 (GYY), 81974151 (GYY), and 81771093 (XC).
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SNM performed the major experiments and wrote the manuscript. YYZ and WXZ were responsible for the collection of clinical data. LLW participated in data interpretation and wrote the manuscript. XC and GYY designed the study, analyzed the data, and wrote the manuscript. All authors read and approved the final manuscript.
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Min, SN., Wu, LL., Zhang, YY. et al. Disruption of tight junction structure contributes to secretory dysfunction in IgG4-related sialadenitis. J Mol Hist 51, 33–46 (2020). https://doi.org/10.1007/s10735-019-09854-8
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DOI: https://doi.org/10.1007/s10735-019-09854-8