Autoantibody epitopes to the smaller isoform of glutamate decarboxylase do not differ in Swedish and Japanese type 1 diabetes patients and may be associated with high-risk human leucocyte antigen class II alleles

Type 1 diabetes (T1D) is an autoimmune disease with a strong human leucocyte antigen (HLA) class II association. Depending on geographic locations, the disease-associated HLA class II alleles vary. We evaluated the β cell-specific autoimmunity reflected in autoantibodies directed to the smaller isof...

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Veröffentlicht in:Clinical and experimental immunology 2007-12, Vol.150 (3), p.416-421
Hauptverfasser: Maruyama, T, Oak, S, Hall, T.R, Banga, J.P, Ortqvist, E, Ettinger, R.A, Endl, J, Hampe, C.S
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container_issue 3
container_start_page 416
container_title Clinical and experimental immunology
container_volume 150
creator Maruyama, T
Oak, S
Hall, T.R
Banga, J.P
Ortqvist, E
Ettinger, R.A
Endl, J
Hampe, C.S
description Type 1 diabetes (T1D) is an autoimmune disease with a strong human leucocyte antigen (HLA) class II association. Depending on geographic locations, the disease-associated HLA class II alleles vary. We evaluated the β cell-specific autoimmunity reflected in autoantibodies directed to the smaller isoform of glutamate decarboxylase (GAD65) in Japanese and Swedish T1D patients. GAD65Ab epitope specificities were assessed using GAD65-specific recombinant Fab. GAD65Ab epitope specificities did not differ between Swedish and Japanese patients. Only recognition of the MICA-4-defined middle epitope was significantly stronger in the Japanese T1D patient group compared to the Swedish T1D patients (P = 0·001). Binding to the b96·11-defined middle epitope was substantial in both groups and showed significant associations with high-risk HLA class II haplotypes. In the Japanese T1D group the association was with haplotype DRB1*0802-DQB1*0302 (P = 0·0008), while in the Swedish T1D patients binding to the b96·11-defined epitope as associated with the presence of high-risk HLA genotypes DR3-DQB1*0201 and/or DR4-DQB1*0302 (P = 0·02). A significant association between reduction in binding in the presence of recombinant Fab (rFab) DPD and high-risk allele DQB1*0201 was found (P = 0·008) in the Swedish T1D patients only. We hypothesize that epitope-specific autoantibodies effect the peptide presentation on HLA class II molecules by modulating antigen uptake and processing. Molecular modelling of the high-risk HLA class II molecules will be necessary to test whether these different molecules present similar peptide-binding specificities.
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Depending on geographic locations, the disease-associated HLA class II alleles vary. We evaluated the β cell-specific autoimmunity reflected in autoantibodies directed to the smaller isoform of glutamate decarboxylase (GAD65) in Japanese and Swedish T1D patients. GAD65Ab epitope specificities were assessed using GAD65-specific recombinant Fab. GAD65Ab epitope specificities did not differ between Swedish and Japanese patients. Only recognition of the MICA-4-defined middle epitope was significantly stronger in the Japanese T1D patient group compared to the Swedish T1D patients (P = 0·001). Binding to the b96·11-defined middle epitope was substantial in both groups and showed significant associations with high-risk HLA class II haplotypes. 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Psychology ; GAD65 ; Genetic Predisposition to Disease ; Glutamate Decarboxylase - immunology ; HLA ; HLA-DR Antigens - genetics ; HLA-DRB1 Chains ; Humans ; Infant ; Infant, Newborn ; Isoenzymes - immunology ; Middle Aged ; Molecular and cellular biology ; Molecular biophysics ; RBA ; T1D ; Time Factors ; Translational Studies</subject><ispartof>Clinical and experimental immunology, 2007-12, Vol.150 (3), p.416-421</ispartof><rights>2008 INIST-CNRS</rights><rights>2007 The Author(s) Journal compilation © 2007 British Society for Immunology 2007</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c5957-1abc2b7934717e836825a42ab72fb5f434e6778574af049f71c5715ed8a540053</citedby><cites>FETCH-LOGICAL-c5957-1abc2b7934717e836825a42ab72fb5f434e6778574af049f71c5715ed8a540053</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC2219379/pdf/$$EPDF$$P50$$Gpubmedcentral$$H</linktopdf><linktohtml>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC2219379/$$EHTML$$P50$$Gpubmedcentral$$H</linktohtml><link.rule.ids>230,314,552,727,780,784,885,27915,27916,53782,53784</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&amp;idt=19869089$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/17956579$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink><backlink>$$Uhttp://kipublications.ki.se/Default.aspx?queryparsed=id:116195971$$DView record from Swedish Publication Index$$Hfree_for_read</backlink></links><search><creatorcontrib>Maruyama, T</creatorcontrib><creatorcontrib>Oak, S</creatorcontrib><creatorcontrib>Hall, T.R</creatorcontrib><creatorcontrib>Banga, J.P</creatorcontrib><creatorcontrib>Ortqvist, E</creatorcontrib><creatorcontrib>Ettinger, R.A</creatorcontrib><creatorcontrib>Endl, J</creatorcontrib><creatorcontrib>Hampe, C.S</creatorcontrib><title>Autoantibody epitopes to the smaller isoform of glutamate decarboxylase do not differ in Swedish and Japanese type 1 diabetes patients and may be associated with high-risk human leucocyte antigen class II alleles</title><title>Clinical and experimental immunology</title><addtitle>Clin Exp Immunol</addtitle><description>Type 1 diabetes (T1D) is an autoimmune disease with a strong human leucocyte antigen (HLA) class II association. Depending on geographic locations, the disease-associated HLA class II alleles vary. We evaluated the β cell-specific autoimmunity reflected in autoantibodies directed to the smaller isoform of glutamate decarboxylase (GAD65) in Japanese and Swedish T1D patients. GAD65Ab epitope specificities were assessed using GAD65-specific recombinant Fab. GAD65Ab epitope specificities did not differ between Swedish and Japanese patients. Only recognition of the MICA-4-defined middle epitope was significantly stronger in the Japanese T1D patient group compared to the Swedish T1D patients (P = 0·001). Binding to the b96·11-defined middle epitope was substantial in both groups and showed significant associations with high-risk HLA class II haplotypes. 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Psychology</topic><topic>GAD65</topic><topic>Genetic Predisposition to Disease</topic><topic>Glutamate Decarboxylase - immunology</topic><topic>HLA</topic><topic>HLA-DR Antigens - genetics</topic><topic>HLA-DRB1 Chains</topic><topic>Humans</topic><topic>Infant</topic><topic>Infant, Newborn</topic><topic>Isoenzymes - immunology</topic><topic>Middle Aged</topic><topic>Molecular and cellular biology</topic><topic>Molecular biophysics</topic><topic>RBA</topic><topic>T1D</topic><topic>Time Factors</topic><topic>Translational Studies</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Maruyama, T</creatorcontrib><creatorcontrib>Oak, S</creatorcontrib><creatorcontrib>Hall, T.R</creatorcontrib><creatorcontrib>Banga, J.P</creatorcontrib><creatorcontrib>Ortqvist, E</creatorcontrib><creatorcontrib>Ettinger, R.A</creatorcontrib><creatorcontrib>Endl, J</creatorcontrib><creatorcontrib>Hampe, C.S</creatorcontrib><collection>AGRIS</collection><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Immunology Abstracts</collection><collection>AIDS and Cancer Research Abstracts</collection><collection>MEDLINE - Academic</collection><collection>PubMed Central (Full Participant titles)</collection><collection>SwePub</collection><collection>SwePub Articles</collection><collection>SWEPUB Freely available online</collection><collection>SwePub Articles full text</collection><jtitle>Clinical and experimental immunology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Maruyama, T</au><au>Oak, S</au><au>Hall, T.R</au><au>Banga, J.P</au><au>Ortqvist, E</au><au>Ettinger, R.A</au><au>Endl, J</au><au>Hampe, C.S</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Autoantibody epitopes to the smaller isoform of glutamate decarboxylase do not differ in Swedish and Japanese type 1 diabetes patients and may be associated with high-risk human leucocyte antigen class II alleles</atitle><jtitle>Clinical and experimental immunology</jtitle><addtitle>Clin Exp Immunol</addtitle><date>2007-12</date><risdate>2007</risdate><volume>150</volume><issue>3</issue><spage>416</spage><epage>421</epage><pages>416-421</pages><issn>0009-9104</issn><eissn>1365-2249</eissn><coden>CEXIAL</coden><abstract>Type 1 diabetes (T1D) is an autoimmune disease with a strong human leucocyte antigen (HLA) class II association. Depending on geographic locations, the disease-associated HLA class II alleles vary. We evaluated the β cell-specific autoimmunity reflected in autoantibodies directed to the smaller isoform of glutamate decarboxylase (GAD65) in Japanese and Swedish T1D patients. GAD65Ab epitope specificities were assessed using GAD65-specific recombinant Fab. GAD65Ab epitope specificities did not differ between Swedish and Japanese patients. Only recognition of the MICA-4-defined middle epitope was significantly stronger in the Japanese T1D patient group compared to the Swedish T1D patients (P = 0·001). Binding to the b96·11-defined middle epitope was substantial in both groups and showed significant associations with high-risk HLA class II haplotypes. In the Japanese T1D group the association was with haplotype DRB1*0802-DQB1*0302 (P = 0·0008), while in the Swedish T1D patients binding to the b96·11-defined epitope as associated with the presence of high-risk HLA genotypes DR3-DQB1*0201 and/or DR4-DQB1*0302 (P = 0·02). A significant association between reduction in binding in the presence of recombinant Fab (rFab) DPD and high-risk allele DQB1*0201 was found (P = 0·008) in the Swedish T1D patients only. We hypothesize that epitope-specific autoantibodies effect the peptide presentation on HLA class II molecules by modulating antigen uptake and processing. Molecular modelling of the high-risk HLA class II molecules will be necessary to test whether these different molecules present similar peptide-binding specificities.</abstract><cop>Oxford, UK</cop><pub>Oxford, UK : Blackwell Publishing Ltd</pub><pmid>17956579</pmid><doi>10.1111/j.1365-2249.2007.03527.x</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record>
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source MEDLINE; PubMed Central; Alma/SFX Local Collection; SWEPUB Freely available online; EZB Electronic Journals Library; Oxford Journals
subjects Adolescent
Adult
Aged
Aged, 80 and over
Alleles
Analytical, structural and metabolic biochemistry
Asian Continental Ancestry Group - genetics
Autoantibodies - blood
autoimmune
Autoimmunity - genetics
Biological and medical sciences
Child
Child, Preschool
Diabetes Mellitus, Type 1 - ethnology
Diabetes Mellitus, Type 1 - genetics
Diabetes Mellitus, Type 1 - immunology
Epitopes - genetics
European Continental Ancestry Group - genetics
Fundamental and applied biological sciences. Psychology
GAD65
Genetic Predisposition to Disease
Glutamate Decarboxylase - immunology
HLA
HLA-DR Antigens - genetics
HLA-DRB1 Chains
Humans
Infant
Infant, Newborn
Isoenzymes - immunology
Middle Aged
Molecular and cellular biology
Molecular biophysics
RBA
T1D
Time Factors
Translational Studies
title Autoantibody epitopes to the smaller isoform of glutamate decarboxylase do not differ in Swedish and Japanese type 1 diabetes patients and may be associated with high-risk human leucocyte antigen class II alleles
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