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J Autoimmun. 2020 Mar 19:102440. doi: 10.1016/j.jaut.2020.102440. [Epub ahead of print]

Antagonizing miR-7 suppresses B cell hyperresponsiveness and inhibits lupus development.

Author information

1
Department of Rheumatology, Chinese Academy of Medical Sciences and Peking Union Medical College Hospital, The Ministry of Education Key Laboratory, Beijing, 100730, China; Clinical Immunology Centre, Medical Epigenetics Research Centre, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100730, China.
2
Department of Rheumatology, Chinese Academy of Medical Sciences and Peking Union Medical College Hospital, The Ministry of Education Key Laboratory, Beijing, 100730, China.
3
Department of Rheumatology and Immunology, The First Affiliated Hospital of Henan University of Science and Technology, Henan, 471003, China.
4
RILITE Research Institute and AMPEL BioSolutions, Charlottesville, VA, USA. Electronic address: peterlipsky@comcast.net.
5
Department of Rheumatology, Chinese Academy of Medical Sciences and Peking Union Medical College Hospital, The Ministry of Education Key Laboratory, Beijing, 100730, China; Clinical Immunology Centre, Medical Epigenetics Research Centre, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100730, China; National Clinical Research Center for Dermatologic and Immunologic Diseases (NCRC-DID), Chinese Academy of Medical Sciences and Peking Union Medical College Hospital, Beijing, 100730, China. Electronic address: zxpumch2003@sina.com.

Abstract

OBJECTIVES:

The objective of this study was to address the biological function of miR-7 in an animal model of systemic lupus erythematosus.

METHODS:

MRLlpr/lpr lupus mice were administrated antagomiR-7 or a scramble control by tail vein for 5weeks. Three groups of animals' tissues were assessed for lupus manifestations by immunofluorescence and immunohistochemistry, and serum was examined for levels of autoantibodies and inflammatory cytokines. Splenic B cell subsets were assessed for intracellular expression of PI3K signaling by FACS. Finally, the ability of the miR-7 antagomir to regulate the expansion of T follicular helper (Tfh) cells and B cell hyperresponsiveness was further explored.

RESULTS:

We found that miR-7 was up-regulated in MRLlpr/lpr lupus mice and directly targeted PTEN mRNA in B cells. Up-regulated miR-7 in MRLlpr/lpr lupus B cells was negatively correlated with PTEN expression. Notably, miR-7 antagomir treatment reduced lupus manifestations in MRLlpr/lpr lupus mice. miR-7-mediated down-regulation of PTEN/AKT signaling promoted B cell differentiation into plasmablasts/plasma cells and spontaneous germinal center (GC) formation, whereas miR-7 antagomir normalized splenic B cell subtypes. Besides suppressing the activation of B cells, miR-7 antagomir intervention also down-regulated STAT3 phosphorylation and production of IL-21 and reduced Tfh expansion.

CONCLUSION:

The above data have demonstrated the critical roles of miR-7 not only in regulating PTEN expression and also B cell and Tfh cell function in lupus-prone MRLlpr/lpr lupus mice. Furthermore, the disease manifestations in MRLlpr/lpr lupus mice are efficiently improved by miR-7 antagomir, indicating miR-7 as a potential treatment strategy in SLE.

KEYWORDS:

B cell hyperresponsiveness; PI3K signaling; SLE; miRNA treatment

PMID:
32201226
DOI:
10.1016/j.jaut.2020.102440

Conflict of interest statement

Declaration of competing interest The authors declare no commercial or financial conflict of interest.

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