Metformin treatment lowers asymmetric dimethylarginine concentrations in patients with type 2 diabetes.
This study was initiated to see if plasma asymmetric dimethylarginine (ADMA) concentrations decreased in hyperglycemic patients with type 2 diabetes following metformin treatment, either as monotherapy or following its addition to sulfonylurea-treated patients. Fasting plasma glucose, dimethylarginine, and L-arginine concentrations were measured before and 3 months after the administration of a maximally effective dose of metformin to 31 patients with type 2 diabetes in poor glycemic control (fasting plasma concentrations > 9.7 mmol/L), while being treated with either diet (n = 16) or a maximal amount of a sulfonylurea compound (n = 15). Fasting plasma glucose concentration (mean +/- SEM) decreased to a similar degree (P <.01) in patients treated with either metformin alone (12.4 +/- 0.5 to 9.5 +/- 0.5 mmol/L) or when it was added to a sulfonylurea compound (14.1 +/- 0.5 to 10.6 +/- 0.9 mmol/L). The improvement in glycemic control was associated with similar decreases (P <.01) in ADMA concentrations in metformin (1.65 +/- 0.21 to 1.18 +/- 0.13 micromol/L) and sulfonylurea + metformin-treated patients (1.75 +/- 0.13 to 1.19 +/- 0.08 micromol/L). Plasma L-arginine concentrations were similar in the 2 groups at baseline and did not change in response to metformin. Thus, metformin treatment was associated with a favorable increase in the plasma L-arginine/ADMA ratio. These results provide the first evidence that plasma ADMA concentrations decrease in association with improved glycemic control in patients with type 2 diabetes and demonstrate that the magnitude of the change in metformin-treated patients was similar, irrespective of whether it was used as monotherapy or in combination with sulfonylurea treatment.
Asagami
T
T
Department of Medicine, Stanford University School of Medicine, Stanford, CA, USA.
Abbasi
F
F
Stuelinger
M
M
Lamendola
C
C
McLaughlin
T
T
Cooke
J P
JP
Reaven
G M
GM
Tsao
P S
PS
D001120:Arginine / Q000031:analogs & derivatives* / Q000097:blood*; D001786:Blood Glucose / Q000187:drug effects; D003404:Creatinine / Q000097:blood; D003924:Diabetes Mellitus, Type 2 / Q000097:blood* / Q000188:drug therapy*; D004359:Drug Therapy, Combination; D005260:Female; D006801:Humans; D007004:Hypoglycemic Agents / Q000627:therapeutic use*; D008297:Male; D008687:Metformin / Q000627:therapeutic use*; D008875:Middle Aged; D013453:Sulfonylurea Compounds / Q000627:therapeutic use; D016896:Treatment Outcome
D001786:Blood Glucose; D007004:Hypoglycemic Agents; D013453:Sulfonylurea Compounds; C018524:N,N-dimethylarginine; D008687:Metformin; D001120:Arginine; D003404:Creatinine