TY - JOUR
T1 - Chronic sulfonylurea treatment and hyperglycemia aggravate disproportionately elevated plasma proinsulin levels in patients with type 2 diabetes
AU - Inoguchi, Toyoshi
AU - Umeda, Fumio
AU - Kakimoto, Maiko
AU - Sako, Yasuhiro
AU - Ishii, Hidehiro
AU - Noda, Katsumi
AU - Kunisaki, Makoto
AU - Imamura, Minako
AU - Yu, Hai Yan
AU - Etoh, Takashi
AU - Yoshikawa, Hiroyasu
AU - Aoki, Tsuyoshi
AU - Hashimoto, Toshihiko
AU - Nawata, Hajime
PY - 2000
Y1 - 2000
N2 - It is established that disproportionately elevated plasma proinsulin levels occur in patients with Type 2 diabetes. In the present study, multivariate analysis was performed to determine what factors contributed to the disproportionately elevated plasma proinsulin levels in Japanese patients with Type 2 diabetes (n=276). Results from univariate analysis showed that both fasting proinsulin/C-peptide ratio and proinsulin/IRI ratio were approximately 2-fold higher in patients with Type 2 diabetes than those in healthy nondiabetic subjects (n=45). In patients with Type 2 diabetes, both proinsulin/C-peptide ratio and proinsulin/IRI ratio were significantly positively correlated with fasting plasma glucose level (FPG) and HbA1c. Neither proinsulin/C-peptide ratio nor proinsulin/IRI ratio was significantly correlated with BMI. Sulfonylurea-treated subjects had a significant elevation in both proinsulin/C-peptide ratio and proinsulin/IRI ratio compared with diet-treated subjects, whereas nonsulfonylurea hypoglycemic agent-treated subjects did not. Multivariate analysis confirmed that sulfonylurea treatment and FPG were significant determinants of both fasting proinsulin/C-peptide ratio (P=0.006 and P=0.030, respectively) and proinsulin/IRI ratio (P=0.003 and P=0.016, respectively) in patients with Type 2 diabetes. These results imply that disproportionate hyperproinsulinemia may reflect an excessive overwork of β cells under chronic sulfonylurea treatment as well as hyperglycemia.
AB - It is established that disproportionately elevated plasma proinsulin levels occur in patients with Type 2 diabetes. In the present study, multivariate analysis was performed to determine what factors contributed to the disproportionately elevated plasma proinsulin levels in Japanese patients with Type 2 diabetes (n=276). Results from univariate analysis showed that both fasting proinsulin/C-peptide ratio and proinsulin/IRI ratio were approximately 2-fold higher in patients with Type 2 diabetes than those in healthy nondiabetic subjects (n=45). In patients with Type 2 diabetes, both proinsulin/C-peptide ratio and proinsulin/IRI ratio were significantly positively correlated with fasting plasma glucose level (FPG) and HbA1c. Neither proinsulin/C-peptide ratio nor proinsulin/IRI ratio was significantly correlated with BMI. Sulfonylurea-treated subjects had a significant elevation in both proinsulin/C-peptide ratio and proinsulin/IRI ratio compared with diet-treated subjects, whereas nonsulfonylurea hypoglycemic agent-treated subjects did not. Multivariate analysis confirmed that sulfonylurea treatment and FPG were significant determinants of both fasting proinsulin/C-peptide ratio (P=0.006 and P=0.030, respectively) and proinsulin/IRI ratio (P=0.003 and P=0.016, respectively) in patients with Type 2 diabetes. These results imply that disproportionate hyperproinsulinemia may reflect an excessive overwork of β cells under chronic sulfonylurea treatment as well as hyperglycemia.
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U2 - 10.1507/endocrj.47.763
DO - 10.1507/endocrj.47.763
M3 - Article
C2 - 11228051
AN - SCOPUS:0034509382
VL - 47
SP - 763
EP - 770
JO - Endocrine Journal
JF - Endocrine Journal
SN - 0918-8959
IS - 6
ER -
