Little enhancement of meal-induced glucagon-like peptide 1 secretion in Japanese: Comparison of type 2 diabetes patients and healthy controls.
Although glucose-dependent insulinotropic polypeptide (GIP) levels have been characterized previously, GLP-1 levels in Asians remain unclear. Here, we investigate total and intact levels of GLP-1, as well as GIP during oral glucose and meal tolerance tests (OGTT and MTT) in Japanese patients with or without type 2 diabetes (T2DM). Seventeen Japanese healthy controls and 18 age-matched and untreated patients with T2DM of short duration participated in the present study. Fasting levels of total GPL-1 were similar between the two groups (approximately 15 pM), and intact GLP-1 levels were considerably low in both groups (less than 1 pM). In both groups, total GLP-1 reached a peak 30 min after glucose ingestion (30-40 pM), whereas intact GLP-1 levels remained low with no significant peak. In MTT, total and intact GLP-1 showed no obvious peak. The current data indicate that intact GLP-1 levels are considerably low in the Japanese and that meal-induced enhancement of GLP-1 secretion is negligible in the Japanese. (J Diabetes Invest, doi: 10.1111/j.2040-1124.2010.00010.x, 2010).
Division of Diabetes, Clinical Nutrition and Endocrinology, Kansai Electric Power Hospital, Osaka.
Daisuke
D
Yabe
Division of Diabetes, Clinical Nutrition and Endocrinology, Kansai Electric Power Hospital, Osaka.
Akira
A
Kuroe
Department of Diabetes, Metabolism and Endocrinology, Showa University School of Medicine, Tokyo, Japan.
Soushou
S
Lee
Division of Diabetes, Clinical Nutrition and Endocrinology, Kansai Electric Power Hospital, Osaka.
Koin
K
Watanabe
Division of Diabetes, Clinical Nutrition and Endocrinology, Kansai Electric Power Hospital, Osaka.
Takanori
T
Hyo
Division of Diabetes, Clinical Nutrition and Endocrinology, Kansai Electric Power Hospital, Osaka.
Masahiro
M
Hishizawa
Division of Diabetes, Clinical Nutrition and Endocrinology, Kansai Electric Power Hospital, Osaka.
Takeshi
T
Kurose
Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark.
Carolyn F
CF
Deacon
Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark.
Jens J
JJ
Holst
Department of Diabetes, Metabolism and Endocrinology, Showa University School of Medicine, Tokyo, Japan.
Tsutomu
T
Hirano
Department of Diabetes and Clinical Nutrition, Kyoto University Graduate School of Medicine, Kyoto, Japan.
Nobuya
N
Inagaki
Division of Diabetes, Clinical Nutrition and Endocrinology, Kansai Electric Power Hospital, Osaka.
Yutaka
Y
Seino
DPP‐4; GIP; GLP‐1