Open AccessPostabsorptive hyperglucagonemia in patients with type 2 diabetes mellitus analyzed with a novel enzyme‐linked immunosorbent assay
Author(s) -
Matsuo Toshihiro,
Miyagawa Junichiro,
Kusunoki Yoshiki,
Miuchi Masayuki,
Ikawa Takashi,
Akagami Takafumi,
Tokuda Masaru,
Katsuno Tomoyuki,
Kushida Akira,
Inagaki Takashi,
Namba Mitsuyoshi
Publication year - 2016
Publication title -
journal of diabetes investigation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.089
H-Index - 50
eISSN - 2040-1124
pISSN - 2040-1116
DOI - 10.1111/jdi.12400
Subject(s) - hyperglucagonemia , proglucagon , glucagon , medicine , diabetes mellitus , radioimmunoassay , endocrinology , type 2 diabetes mellitus , type 1 diabetes , glucose tolerance test , antibody , type 2 diabetes , insulin , glucagon like peptide 1 , insulin resistance , immunology
Aims/introduction The aims of the present study were to investigate the performance of a novel sandwich enzyme‐linked immunosorbent assay ( ELISA ) for measuring glucagon (1–29) with monoclonal antibodies against both the C‐ and N‐terminal regions of glucagon (1–29), and to analyze the differences in plasma levels and responses of glucagon (1–29) to oral glucose loading in normal glucose tolerance ( NGT ) subjects and patients with type 2 diabetes mellitus. Materials and Methods The cross‐reactivity against proglucagon fragments using the ELISA kit and two types of conventional radioimmunoassay ( RIA ) kits was evaluated. A 75‐g oral glucose tolerance test was carried out with NGT subjects and patients with type 2 diabetes mellitus, and the glucagon (1–29) concentration was measured using three types of kit. Results The ELISA kit clearly had the lowest cross‐reactivity against miniglucagon (19–29) and glicentin (1–61). The oral glucose tolerance test was carried out with 30 NGT and 17 patients with type 2 diabetes mellitus. The glucagon (1–29) levels measured by the ELISA kit after glucose loading were significantly higher at all time‐points in the type 2 diabetes mellitus group than in the NGT group. However, the glucagon (1–29) levels measured by one RIA kit were significantly higher in the NGT group, and those measured with the other RIA kit were approximately the same among the groups. Conclusions The novel sandwich ELISA accurately determines plasma glucagon (1–29) concentrations with much less cross‐reactivity against other proglucagon fragments than conventional RIA kits.