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This study evaluated the relation of leptin with glycaemic control and the effect of 14 days of diet, or diet combined with gliclazide, glipizide-GITS or metformin treatment, on leptin concentration in 51 female patients with type 2 diabetes mellitus. Leptin levels were similar both at baseline and after treatment in diabetic and control groups. Diabetic patients with basal fasting plasma glucose (FPG) < 10 mmol/l or with basal postprandial plasma glucose (PPPG) < 13.9 mmol/l had significantly higher leptin levels than diabetic patients with basal FPG > or = 10 mmol/l or with basal PPPG > or = 13.9 mmol/l (19.6+/-8.7 vs. 13.65+/-5.4 microg/l, p < 0.05; and 20.2+/-7.9 vs. 12.9+/-5.2 microg/l, p < 0.05, respectively). Mode of treatment did not influence leptin levels. Delta leptin showed a weak correlation with basal FPG (r = 0.346; p < 0.05), basal and post-treatment PPPG (r = 0.335, p < 0.05 and r = 0.325, p < 0.05, respectively) and a moderate correlation with post-treatment FPG (r = 0.391, p < 0.01). In conclusion, leptin level is not affected by the presence of type 2 diabetes mellitus and by short-term treatment with diet or oral antidiabetic drugs but is directly related to glycaemic control in female patients with type 2 diabetes mellitus.
online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11225747&dopt=Abstract
Diabetes Metab. 1999 Dec;25 Suppl 7:17-9.
[Insulin secretion and repaglinide]
[Article in French]
Owens D.
The natural history of type 2 diabetes involves a progressive pancreatic beta-cell dysfunction leading to quantitative, qualitative and/or temporal abnormalities in insulin secretion and insensitivity to insulin action which predominates in muscles. These abnormalities can be observed during early phases of glucose intolerance, but their determinism remains unclear. The high prevalence of type 2 diabetes, its increasing incidence among developed countries and the huge cost induced by diabetic complications explain why this disease is being viewed as a major public health issue. An earlier diagnosis by general practitioners and more intensive treatments are urged for patient and social beneficial outcome. In addition to non pharmacological (dietary, physical activity) approaches, several drugs were established as efficient therapies for type 2 diabetic patients: sulfonylureas acting by enhancing insulin secretion, metformin improving insulin resistance, or acarbose delaying carbohydrate intestinal absorption. These drugs have been used during the UKPDS trial; nevertheless, their effect was somehow limited, when considering long-term blood glucose control, risk for hypoglycemia, and/or prevention of macroangiopathy. The new generation of insulin secretion enhancers, including repaglinide, by allowing a reduction of total insulinemia, potentiating nutrient-induced insulin secretion, and minimizing risks for hypoglycemia, raises hope for a progress.
online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10746006&dopt=Abstract
Horm Metab Res. 1997 Aug;29(8):379-82.
Pioglitazone and metformin reverse insulin resistance induced by tumor necrosis factor-alpha in liver cells.
Solomon SS, Mishra SK, Cwik C, Rajanna B, Postlethwaite AE.
Research Service, VAMC, Memphis, USA.
Tumor necrosis factor-alpha (TNF-alpha) has recently been implicated as a cause of insulin resistance (IR) in obesity and non-insulin dependent diabetes mellitus (NIDDM). To examine mechanisms involved, we induced IR induced IR in H-411 E cells with graded doses of TNF-alpha and measured the ability of insulin (INS) to stimulate both calmodulin (CaM) mRNA and glucose utilization. With TNF-alpha concentration at 1 ng/ml and 10(4) muU/ml INS, metformin 10 microM and pioglitazone 1.5 microM, reversed the IR induced by TNF-alpha restoring biologic response to 100% of INS effect alone. Furthermore, comparable results were obtained with glucose utilization/oxidation experiments in the H-411 E cells using glucose U-14C, trapping 14CO2 release in a hyamine filter and extracting 14C labelled lipids with Dole's reagent. In condusion, these data add scientific support for the use of both metformin and pioglitazone in treatment of IR in NIDDM patients and support a rationale for use of use of these drugs alone, and in conjuction with oral agents and/or INS treatment.
online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=9288574&dopt=Abstract
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