PMID- 35910083 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20220802 IS - 2633-1055 (Electronic) IS - 2633-1055 (Linking) VI - 17 DP - 2022 TI - At the Root of 3 "Long" Diseases: Persistent Antigens Inflicting Chronic Damage on the Brain and Other Organs in Gulf War Illness, Long-COVID-19, and Chronic Fatigue Syndrome. PG - 26331055221114817 LID - 10.1177/26331055221114817 [doi] LID - 26331055221114817 AB - Several foreign antigens such as those derived from viruses and bacteria have been linked to long-term deleterious effects on the brain and other organs; yet, health outcomes subsequent to foreign antigen exposure vary depending in large part on the host's immune system, in general, and on human leukocyte antigen (HLA) composition, in particular. Here we first provide a brief description of 3 conditions characterized by persistent long-term symptoms, namely long-COVID-19, myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS), and Gulf War Illness (GWI), followed by a brief overview of the role of HLA in the immune response to foreign antigens. We then discuss our Persistent Antigen (PA) hypothesis and highlight associations between antigen persistence due to HLA-antigen incongruence and chronic health conditions in general and the 3 "long" diseases above in particular. This review is not intended to cover the breadth and depth of symptomatology of those diseases but is specifically focused on the hypothesis that the presence of persistent antigens underlies their pathogenesis. CI - (c) The Author(s) 2022. FAU - James, Lisa M AU - James LM AD - Department of Veterans Affairs Health Care System, Brain Sciences Center, Minneapolis, MN, USA. AD - Department of Neuroscience, University of Minnesota Medical School, Minneapolis, MN, USA. AD - Department of Psychiatry, University of Minnesota Medical School, Minneapolis, MN, USA. AD - Center for Cognitive Sciences, University of Minnesota, Minneapolis, MN, USA. FAU - Georgopoulos, Apostolos P AU - Georgopoulos AP AUID- ORCID: 0000-0003-4412-725X AD - Department of Veterans Affairs Health Care System, Brain Sciences Center, Minneapolis, MN, USA. AD - Department of Neuroscience, University of Minnesota Medical School, Minneapolis, MN, USA. AD - Department of Psychiatry, University of Minnesota Medical School, Minneapolis, MN, USA. AD - Center for Cognitive Sciences, University of Minnesota, Minneapolis, MN, USA. AD - Department of Neurology, University of Minnesota Medical School, Minneapolis, MN, USA. LA - eng PT - Journal Article PT - Review DEP - 20220722 PL - United States TA - Neurosci Insights JT - Neuroscience insights JID - 101760670 PMC - PMC9335483 OTO - NOTNLM OT - Gulf War illness OT - Human leukocyte antigen OT - long-COVID OT - myalgic encephalomyelitis/chronic fatigue syndrome OT - persistent antigen COIS- Declaration of Conflicting Interests: The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article. EDAT- 2022/08/02 06:00 MHDA- 2022/08/02 06:01 PMCR- 2022/07/22 CRDT- 2022/08/01 03:25 PHST- 2022/04/19 00:00 [received] PHST- 2022/06/28 00:00 [accepted] PHST- 2022/08/01 03:25 [entrez] PHST- 2022/08/02 06:00 [pubmed] PHST- 2022/08/02 06:01 [medline] PHST- 2022/07/22 00:00 [pmc-release] AID - 10.1177_26331055221114817 [pii] AID - 10.1177/26331055221114817 [doi] PST - epublish SO - Neurosci Insights. 2022 Jul 22;17:26331055221114817. doi: 10.1177/26331055221114817. eCollection 2022.