PMID- 25524212 OWN - NLM STAT- MEDLINE DCOM- 20150915 LR - 20150914 IS - 1525-2191 (Electronic) IS - 0002-9440 (Linking) VI - 185 IP - 1 DP - 2015 Jan TI - Expression of human leukocyte antigen class I in endocrine and exocrine pancreatic tissue at onset of type 1 diabetes. PG - 129-38 AB - The cause of type 1 diabetes remains unknown. To dissect the link between hyperexpression of human leukocyte antigen (HLA) class I on the islet cells, we examined its expression in subjects with recent-onset type 1 diabetes. IHC showed seemingly pronounced hyperexpression in subjects with recent-onset type 1 diabetes, as well as in some nondiabetic subjects. In all subjects, HLA class I expression on exocrine tissue was low. However, no difference in the level of HLA class I expression was found between islet and exocrine tissue using Western blot, flow cytometry, real-time quantitative PCR, or RNA sequencing analyses. Also, the level of HLA class I expression on the messenger level was not increased in islets from subjects with recent-onset type 1 diabetes compared with that in nondiabetic subjects. Consistently, the HLA class I specific enhanceosome (NLRC5) and related transcription factors, as well as interferons, were not enhanced in islets from recent-onset type 1 diabetic subjects. In conclusion, a discrepancy in HLA class I expression in islets assessed by IHC was observed compared with that using quantitative techniques showing similar expression of HLA class I in islets and exocrine tissue in subjects with recent-onset type 1 diabetes, nor could any differences be found between type 1 diabetic and nondiabetic subjects. Results presented provide important clues for a better understanding on how this complex disease develops. FAU - Skog, Oskar AU - Skog O AD - Department of Immunology, Genetics, and Pathology, Uppsala University, Uppsala, Sweden. FAU - Korsgren, Stella AU - Korsgren S FAU - Wiberg, Anna AU - Wiberg A FAU - Danielsson, Angelika AU - Danielsson A FAU - Edwin, Bjorn AU - Edwin B FAU - Buanes, Trond AU - Buanes T FAU - Krogvold, Lars AU - Krogvold L FAU - Korsgren, Olle AU - Korsgren O FAU - Dahl-Jorgensen, Knut AU - Dahl-Jorgensen K LA - eng PT - Journal Article PL - United States TA - Am J Pathol JT - The American journal of pathology JID - 0370502 RN - 0 (Intracellular Signaling Peptides and Proteins) RN - 0 (NLRC5 protein, human) RN - 0 (Transcription Factors) RN - 9008-11-1 (Interferons) SB - IM MH - Adolescent MH - Adult MH - Aged MH - Child MH - Diabetes Mellitus, Type 1/diagnosis/*metabolism MH - *Genes, MHC Class I MH - Humans MH - Interferons/metabolism MH - Intracellular Signaling Peptides and Proteins/metabolism MH - Islets of Langerhans/*metabolism MH - Middle Aged MH - Pancreas, Exocrine/*metabolism MH - Transcription Factors/metabolism MH - Transcriptome MH - Young Adult EDAT- 2014/12/20 06:00 MHDA- 2015/09/16 06:00 CRDT- 2014/12/20 06:00 PHST- 2014/05/15 00:00 [received] PHST- 2014/08/28 00:00 [revised] PHST- 2014/09/09 00:00 [accepted] PHST- 2014/12/20 06:00 [entrez] PHST- 2014/12/20 06:00 [pubmed] PHST- 2015/09/16 06:00 [medline] AID - S0002-9440(14)00548-3 [pii] AID - 10.1016/j.ajpath.2014.09.004 [doi] PST - ppublish SO - Am J Pathol. 2015 Jan;185(1):129-38. doi: 10.1016/j.ajpath.2014.09.004.