Suppression of high-mobility group box 1 ameliorates xerostomia in a Sjögren syndrome-triggered mouse model.

Abstract:

:Xerostomia is a self-conscious symptom. High-mobility group box 1 (HMGB1) promotes pro-inflammatory effects in many diseases. This study aimed to clarify the role of HMGB1 in Sjögren syndrome (SS)-triggered xerostomia. Nonobese diabetic (NOD)/Ltj mice were used to establish an SS-triggered xerostomia model. The results showed that saliva production was decreased and anti-Sjögren syndrome B (anti-SSB) level was increased in SS. PCR, Western blot, and immunohistochemistry experiments indicated that the HMGB1 and aquaporin 5 (AQP5) levels were enhanced and diminished in SS compared with those in the control, respectively. While the mice were treated with anti-HMGB1, xerostomia was reversed due to the elevated saliva production and reduced anti-SSB level. In addition, it was found that the inhibition of HMGB1 restrained the toll-like receptor 4 (TLR4)/nuclear factor kappa B (NF-κB) axis activation. The TLR4 and p-IκB levels were alleviated, while the IκBα and NF-κB p65 levels were augmented. The NF-κB p65 binding activity was attenuated via the electrophoretic mobility shift assay (EMSA) after anti-HMGB1 treatment. Moreover, the repression of HMGB1 facilitated the expression of AQP5. These findings demonstrate that suppression of HMGB1 ameliorates SS-triggered xerostomia via suppressing the HMGB1/TLR4/NF-κB signaling pathway and upregulating AQP5 expression.

authors

Wang D,Zhou M,Wang Y,Sun S

doi

10.1139/cjpp-2019-0337

subject

Has Abstract

pub_date

2020-06-01 00:00:00

pages

351-356

issue

6

eissn

0008-4212

issn

1205-7541

journal_volume

98

pub_type

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