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Arthritis Res Ther. 2018 Sep 6;20(1):205. doi: 10.1186/s13075-018-1698-5.

The role of RORα in salivary gland lesions in patients with primary Sjögren's syndrome.

Author information

1
Department of Stomatology, Zhongnan Hospital of Wuhan University, 169 Donghu Road, Wuhan, 430071, Hubei Province, China.
2
Department of Stomatology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Ave, Jianhan District, Wuhan, 430022, Hubei Province, China.
3
Department of Rheumatology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Ave, Jianghan District, Wuhan, 430022, Hubei Province, China. cuishun7171@foxmail.com.
4
Department of Stomatology, Zhongnan Hospital of Wuhan University, 169 Donghu Road, Wuhan, 430071, Hubei Province, China. chengbo_01@hotmail.com.

Abstract

BACKGROUND:

The orphan nuclear receptors retinoic acid-related receptor α and γt (RORα and RORγt) are critical in the development of T helper 17 (Th17) cells, and ROR-specific synthetic ligands have proven efficacy in several mouse models of autoimmunity. However, the pathological significance of RORα in primary Sjögren's syndrome (pSS) remains to be elucidated. The present study was designed to clarify the significance of RORα in the pathogenesis of pSS.

METHODS:

RORα expression in the labial salivary gland (LSG) was determined by immunohistochemical analysis using a quantitative scoring system in 34 patients with pSS. The correlation between RORα expression in LSGs and the focus score (FS) was determined, and Th17 and IL-17 receptor A (1L-17RA) levels in LSGs were determined. To investigate the effect of RORs and the therapeutic potential of targeting RORs in pSS, we administered SR1001, a selective RORα/γt inverse agonist, to non-obese diabetic (NOD) mice.

RESULTS:

The expression of RORα was significantly increased in LSGs of patients with pSS and intensified with disease stage/FS, showing a similar increasing trend with IL-17A and IL-17RA. SR1001 significantly improved salivary gland secretory function and relieved sialadenitis in treated mice.

CONCLUSION:

Our data reveal the importance of RORα in controlling pathologic lymphocytic infiltration of the salivary glands and suggest that RORα may be a druggable target in treating pSS.

KEYWORDS:

Focus score; Inverse agonist; Primary Sjögren’s syndrome; RORα; Th17 cells

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