Carboxypeptidase-H autoantibodies differentiate a more latent subset of autoimmune diabetes from phenotypic type 2 diabetes among Chinese adults.
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| Abstract |
This study aimed to investigate whether carboxypeptidase-H antibody (CPH-Ab) can help identify latent autoimmune diabetes in adults (LADA). Phenotypic type 2 diabetic (T2D) patients (n= 1296) were studied for CPH Abs and autoantibodies to glutamic acid decarboxylase (GAD-Abs). CPH-Ab(+) T2D patients also underwent testing for insulinoma protein tyrosine phosphatase (IA-2A). Clinical features were compared among CPH-Ab(+), GAD-Ab(+), and Ab(-) T2D patients. Some of the antibody-positive patients were followed up for 3 years to assess beta cell function. The prevalence of CPH-Abs in T2D patients was 4.8%, significantly higher than that in controls. Double positivity was rare between CPH-Abs and GAD-Abs or IA-2A. Compared to patients with Ab(-) T2D, those with CPH-Ab(+) T2D had lower BMI, lower fasting C-peptide (FCP) levels, and more frequent ketosis, while not as much as did those with GAD-Ab(+) T2D. The mild beta cell dysfunction in patients with CPH-Ab(+) T2D was associated with their longer duration of diabetes. No marked change of C-peptide in the CPH-Ab(+) group was found during follow-up. These findings demonstrated that CPH-Abs may allow discrimination of a more latent subset of adult-onset autoimmune diabetes (LADA) whose features are intermediate between those with classic GAD-Ab(+) LADA and patients with Ab(-) T2D.
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| Authors | L Yang, Z G Zhou, S Z Tan, G Huang, P Jin, X Yan, X Li, H Peng, W Hagopian |
| Journal | Annals of the New York Academy of Sciences (Ann N Y Acad Sci) Vol. 1150 Pg. 263-6 (Dec 2008) ISSN: 1749-6632 [Electronic] United States |
| PMID | 19120309 (Publication Type: Comparative Study, Evaluation Study, Journal Article, Research Support, Non-U.S. Gov't) |
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