Maladaptive Autophagy in the Pathogenesis of Autoimmune Epithelitis in Sjögren's Syndrome.
Journal
Arthritis & rheumatology (Hoboken, N.J.)
ISSN: 2326-5205
Titre abrégé: Arthritis Rheumatol
Pays: United States
ID NLM: 101623795
Informations de publication
Date de publication:
04 2022
04 2022
Historique:
revised:
06
09
2021
received:
18
06
2021
accepted:
02
11
2021
pubmed:
9
11
2021
medline:
3
5
2022
entrez:
8
11
2021
Statut:
ppublish
Résumé
Salivary gland epithelial cells (SGECs) are key cellular drivers in the pathogenesis of primary Sjögren's syndrome (SS); however, the mechanisms sustaining SGEC activation in primary SS remain unclear. We undertook this study to determine the role of autophagy in the survival and activation of SGECs in primary SS. Primary SGECs isolated from the minor SGs of patients with primary SS or sicca syndrome were evaluated by flow cytometry, immunoblotting, and immunofluorescence to assess autophagy (autophagic flux, light chain 3 IIB [LC3-IIB], p62, LC3-IIB+/lysosome-associated membrane protein 1 [LAMP-1] staining), apoptosis (annexin V/propidium iodide [PI], caspase 3), and activation (intercellular adhesion molecule, vascular cell adhesion molecule). Focus score and germinal center presence were assessed in the SGs from the same patients to assess correlation with histologic severity. Human SG (HSG) cells were stimulated in vitro with peripheral blood mononuclear cells (PBMCs) and serum from primary SS patients in the presence or absence of autophagy inhibitors to determine changes in autophagy and epithelial cell activation. SGECs from primary SS patients (n = 24) exhibited increased autophagy (autophagic flux [P = 0.001]; LC3-IIB [P = 0.02]; p62 [P = 0.064]; and as indicated by LC3-IIB/LAMP-1+ staining), increased expression of antiapoptotic molecules (Bcl-2 [P = 0.006]), and reduced apoptosis (annexin V/PI [P = 0.002]; caspase 3 [P = 0.057]), compared to samples from patients with sicca syndrome (n = 16). Autophagy correlated with histologic disease severity. In vitro experiments on HSG cells stimulated with serum and PBMCs from primary SS patients confirmed activation of autophagy and expression of adhesion molecules, which was reverted upon pharmacologic inhibition of autophagy. In primary SS SGECs, inflammation induces autophagy and prosurvival mechanisms, which promote SGEC activation and mirror histologic severity. These findings indicate that autophagy is a central contributor to the pathogenesis of primary SS and a new therapeutic target.
Substances chimiques
Annexin A5
0
Cell Adhesion Molecules
0
Transcription Factors
0
Caspase 3
EC 3.4.22.-
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
654-664Informations de copyright
© 2021 American College of Rheumatology.
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