A case of elderly-onset type 1 diabetes mellitus: negative for antiglutamic acid dehydrogenase antibody and positive insulinoma-associated tyrosine phosphatase-like protein-2 antibody

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  • Chiba Yuko
    Department of Endocrinology and Metabolism, Tokyo Metropolitan Geriatric Hospital
  • Ynie Jeong
    Department of Endocrinology and Metabolism, Tokyo Metropolitan Geriatric Hospital
  • Kimbara Yoshiyuki
    Department of Endocrinology and Metabolism, Tokyo Metropolitan Geriatric Hospital
  • Tamura Yoshiaki
    Department of Endocrinology and Metabolism, Tokyo Metropolitan Geriatric Hospital
  • Mori Seijiro
    Department of Endocrinology and Metabolism, Tokyo Metropolitan Geriatric Hospital
  • Ito Hideki
    Department of Endocrinology and Metabolism, Tokyo Metropolitan Geriatric Hospital
  • Araki Atsushi
    Department of Endocrinology and Metabolism, Tokyo Metropolitan Geriatric Hospital

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Other Title
  • 抗GAD抗体陰性かつ抗IA-2抗体陽性を呈した高齢発症1型糖尿病の1例
  • 症例報告 抗GAD抗体陰性かつ抗IA-2抗体陽性を呈した高齢発症1型糖尿病の1例
  • ショウレイ ホウコク コウGAD コウタイ インセイ カツ コウIA-2 コウタイ ヨウセイ オ テイシタ コウレイ ハッショウ 1ガタ トウニョウビョウ ノ 1レイ

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An 83-year-old Japanese woman given a diagnosis of type 2 diabetes mellitus 3 years previously was hospitalized for markedly elevated plasma glucose (386 mg/dl) and glycated hemoglobin (9.3%) levels. Laboratory study results showed urinary connecting peptide immunoreactivity (CPR) concentrations of 8.9 μg/day and serum CPR levels <0.2 ng/ml before and 0.3 ng/ml 6 min after glucagon administration, indicating decreased insulin secretion. Although antiglutamic acid dehydrogenase (GAD) antibody levels were negative, insulinoma-associated tryrosine phosphatase-like protein-2 (IA-2) antibody levels were positive (50 U/ml), leading to a diagnosis of type 1 diabetes mellitus.<br> Furthermore, human leukocyte antigen (HLA) typing revealed DRB1*0901, a diabetes-susceptibility gene. Intensive insulin therapy was initiated. This was a rare case of elderly-onset type 1 diabetes.<br>

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