PMID- 33367784 OWN - NLM STAT- MEDLINE DCOM- 20211019 LR - 20211223 IS - 1945-7197 (Electronic) IS - 0021-972X (Print) IS - 0021-972X (Linking) VI - 106 IP - 4 DP - 2021 Mar 25 TI - HLA Class I Upregulation and Antiviral Immune Responses in Graves Disease. PG - e1763-e1774 LID - 10.1210/clinem/dgaa958 [doi] AB - CONTEXT: The origin of Graves disease (GD) remains elusive. However, evidence of an association between GD and viral infections is emerging. Human leukocyte antigen (HLA) class I presents viral antigens to circulating immune cells and plays a crucial role in the defense against viral infections. OBJECTIVE: This work aimed to investigate HLA class I expression, enterovirus presence, and the viral immune response proteins signal transducer and activation of transcription 1 (STAT1) and protein kinase R (PKR) in thyroid tissue from GD patients. METHODS: We collected thyroid tissue from core needle biopsies or surgical specimens from 48 GD patients and 24 controls. Standard immunohistochemistry was used to detect HLA class I and enteroviral capsid protein 1 (VP1) on formalin-fixed and paraffin-embedded tissue. STAT1 and PKR were examined by combined immunofluorescence staining. HLA class I expression score was the main outcome measure. RESULTS: The HLA class I expression score, which takes both proportion and intensity of immunostaining into account, was significantly higher in GD patients (3.1 +/- 3.3) than in controls (0.5 +/- 0.9) (P < .001). Significantly more VP1 positive thyroid cells were found GD samples (50.1 +/- 30.5%) than in controls (14.9 +/- 10.5%) (P < .001). STAT1 and HLA class I were found within the same thyroid cells and PKR and VP1 were also colocalized within thyroid cells. CONCLUSION: HLA class I is upregulated in GD and enterovirus protein is prevalent in thyroid tissue. The colocalization of HLA class I with STAT1 and VP1 with PKR indicates an antiviral tissue response. These findings support the concept of a link between viral infections and GD. CI - (c) The Author(s) 2020. Published by Oxford University Press on behalf of the Endocrine Society. FAU - Weider, Therese AU - Weider T AD - Department of Endocrinology, Morbid Obesity and Preventive Medicine, Oslo University Hospital, Oslo, Norway. AD - The University of Oslo, Faculty of Medicine, Oslo, Norway. FAU - Richardson, Sarah J AU - Richardson SJ AD - Islet Biology Exeter, Institute of Biomedical and Clinical Sciences, University of Exeter Medical School, UK. FAU - Morgan, Noel G AU - Morgan NG AD - Islet Biology Exeter, Institute of Biomedical and Clinical Sciences, University of Exeter Medical School, UK. FAU - Paulsen, Trond H AU - Paulsen TH AD - Department of Breast and Endocrine Surgery, Oslo University Hospital, Oslo, Norway. FAU - Dahl-Jorgensen, Knut AU - Dahl-Jorgensen K AD - The University of Oslo, Faculty of Medicine, Oslo, Norway. AD - Department of Pediatric Medicine, Oslo University Hospital, Oslo, Norway. FAU - Hammerstad, Sara Salehi AU - Hammerstad SS AD - Department of Pediatric Medicine, Oslo University Hospital, Oslo, Norway. AD - The Specialist Center Pilestredet Park, Oslo, Norway. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - J Clin Endocrinol Metab JT - The Journal of clinical endocrinology and metabolism JID - 0375362 RN - 0 (Histocompatibility Antigens Class I) SB - IM MH - Adult MH - Aged MH - Case-Control Studies MH - Chronic Disease MH - Female MH - *Graves Disease/immunology/metabolism/pathology MH - Histocompatibility Antigens Class I/*metabolism MH - Humans MH - Immunity/physiology MH - Male MH - Middle Aged MH - Thyroid Gland/metabolism/pathology MH - Up-Regulation/immunology MH - Viruses/*immunology PMC - PMC7993595 OTO - NOTNLM OT - Graves disease OT - HLA class I OT - STAT1 OT - autoimmune thyroid disease OT - enterovirus OT - viral infections EDAT- 2020/12/29 06:00 MHDA- 2021/10/21 06:00 PMCR- 2020/12/25 CRDT- 2020/12/28 12:17 PHST- 2020/10/06 00:00 [received] PHST- 2020/12/29 06:00 [pubmed] PHST- 2021/10/21 06:00 [medline] PHST- 2020/12/28 12:17 [entrez] PHST- 2020/12/25 00:00 [pmc-release] AID - 6047595 [pii] AID - dgaa958 [pii] AID - 10.1210/clinem/dgaa958 [doi] PST - ppublish SO - J Clin Endocrinol Metab. 2021 Mar 25;106(4):e1763-e1774. doi: 10.1210/clinem/dgaa958.