Insulin Transactivator MafA Regulates Intrathymic Expression of Insulin and Affects Susceptibility to Type 1 Diabetes

Tissue-specific self-antigens are ectopically expressed within the thymus and play an important role in the induction of central tolerance. Insulin is expressed in both pancreatic islets and the thymus and is considered to be the primary antigen for type 1 diabetes. Here, we report the role of the i...

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Veröffentlicht in:Diabetes (New York, N.Y.) N.Y.), 2010-10, Vol.59 (10), p.2579-2587
Hauptverfasser: NOSO, Shinsuke, KATAOKA, Kohsuke, IKEGAMI, Hiroshi, KAWABATA, Yumiko, BABAYA, Naru, HIROMINE, Yoshihisa, YAMAJI, Kaori, FUJISAWA, Tomomi, ARAMATA, Shinsaku, KUDO, Takashi, TAKAHASHI, Satoru
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container_end_page 2587
container_issue 10
container_start_page 2579
container_title Diabetes (New York, N.Y.)
container_volume 59
creator NOSO, Shinsuke
KATAOKA, Kohsuke
IKEGAMI, Hiroshi
KAWABATA, Yumiko
BABAYA, Naru
HIROMINE, Yoshihisa
YAMAJI, Kaori
FUJISAWA, Tomomi
ARAMATA, Shinsaku
KUDO, Takashi
TAKAHASHI, Satoru
description Tissue-specific self-antigens are ectopically expressed within the thymus and play an important role in the induction of central tolerance. Insulin is expressed in both pancreatic islets and the thymus and is considered to be the primary antigen for type 1 diabetes. Here, we report the role of the insulin transactivator MafA in the expression of insulin in the thymus and susceptibility to type 1 diabetes. The expression profiles of transcriptional factors (Pdx1, NeuroD, Mafa, and Aire) in pancreatic islets and the thymus were examined in nonobese diabetic (NOD) and control mice. Thymic Ins2 expression and serum autoantibodies were examined in Mafa knockout mice. Luciferase reporter assay was performed for newly identified polymorphisms of mouse Mafa and human MAFA. A case-control study was applied for human MAFA polymorphisms. Mafa, Ins2, and Aire expression was detected in the thymus. Mafa expression was lower in NOD thymus than in the control and was correlated with Ins2 expression. Targeted disruption of MafA reduced thymic Ins2 expression and induced autoantibodies against pancreatic islets. Functional polymorphisms of MafA were newly identified in NOD mice and humans, and polymorphisms of human MAFA were associated with susceptibility to type 1 diabetes but not to autoimmune thyroid disease. These data indicate that functional polymorphisms of MafA are associated with reduced expression of insulin in the thymus and susceptibility to type 1 diabetes in the NOD mouse as well as human type 1 diabetes.
doi_str_mv 10.2337/db10-0476
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Insulin is expressed in both pancreatic islets and the thymus and is considered to be the primary antigen for type 1 diabetes. Here, we report the role of the insulin transactivator MafA in the expression of insulin in the thymus and susceptibility to type 1 diabetes. The expression profiles of transcriptional factors (Pdx1, NeuroD, Mafa, and Aire) in pancreatic islets and the thymus were examined in nonobese diabetic (NOD) and control mice. Thymic Ins2 expression and serum autoantibodies were examined in Mafa knockout mice. Luciferase reporter assay was performed for newly identified polymorphisms of mouse Mafa and human MAFA. A case-control study was applied for human MAFA polymorphisms. Mafa, Ins2, and Aire expression was detected in the thymus. Mafa expression was lower in NOD thymus than in the control and was correlated with Ins2 expression. Targeted disruption of MafA reduced thymic Ins2 expression and induced autoantibodies against pancreatic islets. 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Insulin is expressed in both pancreatic islets and the thymus and is considered to be the primary antigen for type 1 diabetes. Here, we report the role of the insulin transactivator MafA in the expression of insulin in the thymus and susceptibility to type 1 diabetes. The expression profiles of transcriptional factors (Pdx1, NeuroD, Mafa, and Aire) in pancreatic islets and the thymus were examined in nonobese diabetic (NOD) and control mice. Thymic Ins2 expression and serum autoantibodies were examined in Mafa knockout mice. Luciferase reporter assay was performed for newly identified polymorphisms of mouse Mafa and human MAFA. A case-control study was applied for human MAFA polymorphisms. Mafa, Ins2, and Aire expression was detected in the thymus. Mafa expression was lower in NOD thymus than in the control and was correlated with Ins2 expression. Targeted disruption of MafA reduced thymic Ins2 expression and induced autoantibodies against pancreatic islets. 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Apud cells (diseases)</subject><subject>Endocrinopathies</subject><subject>Etiopathogenesis. Screening. Investigations. 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KATAOKA, Kohsuke ; IKEGAMI, Hiroshi ; KAWABATA, Yumiko ; BABAYA, Naru ; HIROMINE, Yoshihisa ; YAMAJI, Kaori ; FUJISAWA, Tomomi ; ARAMATA, Shinsaku ; KUDO, Takashi ; TAKAHASHI, Satoru</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c674t-708c238fdbf299f474c3642f4f86624b33c42c9209cba88962d6aceabef8d7e03</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2010</creationdate><topic>AIRE Protein</topic><topic>Animals</topic><topic>Antibodies</topic><topic>Antigens</topic><topic>Autoimmune diseases</topic><topic>Biological and medical sciences</topic><topic>Development and progression</topic><topic>Diabetes</topic><topic>Diabetes Mellitus, Type 1 - genetics</topic><topic>Diabetes. Impaired glucose tolerance</topic><topic>Disease</topic><topic>DNA-Binding Proteins - genetics</topic><topic>Dosage and administration</topic><topic>Drug therapy</topic><topic>Endocrine pancreas. Apud cells (diseases)</topic><topic>Endocrinopathies</topic><topic>Etiopathogenesis. Screening. Investigations. 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Insulin is expressed in both pancreatic islets and the thymus and is considered to be the primary antigen for type 1 diabetes. Here, we report the role of the insulin transactivator MafA in the expression of insulin in the thymus and susceptibility to type 1 diabetes. The expression profiles of transcriptional factors (Pdx1, NeuroD, Mafa, and Aire) in pancreatic islets and the thymus were examined in nonobese diabetic (NOD) and control mice. Thymic Ins2 expression and serum autoantibodies were examined in Mafa knockout mice. Luciferase reporter assay was performed for newly identified polymorphisms of mouse Mafa and human MAFA. A case-control study was applied for human MAFA polymorphisms. Mafa, Ins2, and Aire expression was detected in the thymus. Mafa expression was lower in NOD thymus than in the control and was correlated with Ins2 expression. Targeted disruption of MafA reduced thymic Ins2 expression and induced autoantibodies against pancreatic islets. Functional polymorphisms of MafA were newly identified in NOD mice and humans, and polymorphisms of human MAFA were associated with susceptibility to type 1 diabetes but not to autoimmune thyroid disease. These data indicate that functional polymorphisms of MafA are associated with reduced expression of insulin in the thymus and susceptibility to type 1 diabetes in the NOD mouse as well as human type 1 diabetes.</abstract><cop>Alexandria, VA</cop><pub>American Diabetes Association</pub><pmid>20682694</pmid><doi>10.2337/db10-0476</doi><tpages>9</tpages><oa>free_for_read</oa></addata></record>
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source MEDLINE; EZB-FREE-00999 freely available EZB journals; PubMed Central
subjects AIRE Protein
Animals
Antibodies
Antigens
Autoimmune diseases
Biological and medical sciences
Development and progression
Diabetes
Diabetes Mellitus, Type 1 - genetics
Diabetes. Impaired glucose tolerance
Disease
DNA-Binding Proteins - genetics
Dosage and administration
Drug therapy
Endocrine pancreas. Apud cells (diseases)
Endocrinopathies
Etiopathogenesis. Screening. Investigations. Target tissue resistance
Female
Gene Expression Profiling
Gene Expression Regulation
Genes
Genetic Predisposition to Disease
Genetic regulation
Genetic susceptibility
Humans
Immunohistochemistry
Immunology and Transplantation
Insulin
Insulin - genetics
Islets of Langerhans - cytology
Islets of Langerhans - physiology
Laboratories
Maf Transcription Factors, Large - deficiency
Maf Transcription Factors, Large - genetics
Maf Transcription Factors, Large - physiology
Male
Medical sciences
Mice
Mice, Inbred NOD
Mice, Knockout
Promoter Regions, Genetic
Regulation
Research design
Reverse Transcriptase Polymerase Chain Reaction
Risk factors
Thymus gland
Thymus Gland - physiology
Thyroid gland
Transcription Factors - genetics
Transcription, Genetic
Type 1 diabetes
title Insulin Transactivator MafA Regulates Intrathymic Expression of Insulin and Affects Susceptibility to Type 1 Diabetes
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