Effects of Incretins on Human Platelet Function
Novel drugs for the treatment of patients with diabetes are of interest for cardiologists if they reduce the risk of cardiovascular events. However, as documented by the current discussion about the potential benefits of glitazones, high hopes can fail. Initial beneficial cardiovascular effects shown in proof-of-concept studies were muted by the apparent higher mortality in the metaanalysis of studies with rosiglitazone. The rapidly increasing use of GLP-1 analogues and DPP-4 inhibitors for the treatment of type 2 diabetes mellitus may be of major interest for the cardiologist. Potential beneficial actions on the cardiovascular system so far shown in animal experiments and small proof of concept studies may provide the rationale for using these drugs specifically in diabetic patients with secondary complications such as macrovascular disease or diabetic cardiomyopathy. Theoretically, these new therapies could also proof beneficial in patients with heart failure, independently of concomitant diabetes mellitus. However, many unanswered questions need to be addressed in the near future to extend the experimental findings to potential benefits of real life patients. In summary a new class of antidiabetic drugs, which could possibly directly influence cardiovascular effects of diabetes mellitus and thus possibly treat or even prevent life threatening complications has become available.
Then our working hypothesis is that incretins may have desirable cardiovascular outcomes through modulating platelet function. In order to test this hypothesis we propose to assess the presence of their specific receptors in isolated human platelets. In addition, we propose to sudy the effect of the endogenous incretins (glucagon-like peptide 1 and gastric inhibitory peptide) on human platelet function isolated in a test tube.
|Study Design:||Time Perspective: Cross-Sectional|
|Official Title:||Effects of Incretins on Human Platelet Function|
- Expression of glucagon like peptide -1 (GLP-1) and gastric inhibitory peptide (GIP) receptors in normal human platelets [ Time Frame: Platelets drawn from a volunteer will be evaluated 1 time (in 1-2 days) ] [ Designated as safety issue: No ]1.1 Measurement of GLP-1 and GIP receptors at the platelet RNA level by Real Time-PCR 1.2 GLP-1 and GIP receptors detection at the protein level: 1.2.1 Expression on platelet membrane by flow cytometry. 1.2.2 Detection in total platelet proteins by western-blot.
- Improvement in basal or aggregant-induced platelet activation (with and without glucose added to the media, 200 mg/dl, 400 mg/dL) by GLP-1-(7-36)NH2 and its metabolite (GLP-1-(9-36)NH2)and a GIP agonist at different concentrations. [ Time Frame: Platelets drawn from a volunteer will be evaluated 1 time (in 1-2 days) ] [ Designated as safety issue: No ]
1 Direct effect of GLP-1-(7-36)NH2 and its metabolite (GLP-1-(9-36)NH2) and GIP agonist on platelet aggregation, with and without preincubation at different glucose concentrations.
2. GLP-1-(7-36)NH2 and its metabolite (GLP-1-(9-36)NH2) and GIP agonist modulation (with and without 200mg/dL and 400 mg/dL glucose added to the media) of platelet activation and aggregation induced by classical platelet agonists such as ADP, collagen and bovine von Willebrand factor.
|Study Start Date:||December 2011|
Healthy volunteers will be asked to donor a 10-80 ml blood through a venous puncture
Other: venous puncture
Blood for in vitro studies will be drawn
Other Name: volunteers
|Contact: Carlos J Pirola, PhD||54-11-4514-8701 ext firstname.lastname@example.org|
|Contact: Rosana Marta, PhD||54-11-4514-8701 ext email@example.com|
|Principal Investigator:||Carlos J Pirola, PhD||Unidad Ejecutora IDIM-CONICET|