Completed

NCT Number: NCT01408862

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 (Dipeptidyl protease 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 was 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 proposed 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.

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Key information

Conditions

Inhibition of Platelet Aggregation by Incretins

Age range

21 year–65 year

Sex eligibility

All sexes

Study type

Observational

About this study

Aims and Methods: The prevalence of Type 2 diabetes (T2D) continues to increase globally and brings with it a parallel increase in the associated cardiovascular disease complications. Correction of platelet hyperactivity holds promise for this high-risk population of T2D patients by contributing to restore normal hemostasis, which has lead to the search for new antiagregant drugs. Then, our aim was to study whether incretins may modulate platelet function; for this purpose platelets from healthy subjects who were not taken any medication were studied. Besides, normal mature megakaryocytes obtained by culture of human cord blood derived-CD34+ hematopoietic progenitor cells were also studied.

For platelet function studies, platelet aggregation was tested in the absence and presence of different concentrations (10-9 M to 10-5 M) of glucagon-like peptide-1,GLP1-(7-36)NH2, and glucose-dependent insulinotropic polypeptide (GIP) agonist by a turbidimetricassay. The effect of 300 mg/dLglucose added to the media was also evaluated. GLP1R (glucagon-like peptide 1 receptor) and GIPR (GIP receptor) mRNA expression was evaluated by Real Time PCR in platelet and megakaryocyte total mRNA. The putative presence of their proteins was assayed by western blot and flow cytometry in both samples.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

Healthy blood donors

Exclusion criteria

Diabetes
Hypertension
Morbid obesity
Cardiovascular disease
Hematological diseases and hyperlipidemia

Treatment and study plan

venous puncture

Other

Blood for in vitro studies will be drawn

Other names: volunteers

Primary outcomes

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 were evaluated 1 time (in 1-2 days)

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. Data of flow cytometry are provided below
Changes 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)
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.
- GLP-1-(7-36)NH2 and its metabolite (GLP-1-(9-36)NH2) and GIP agonist modulation (with and without 300 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.
Data points from various conditions were combined (averaged),

Sponsors and collaborators

Lead sponsor

National Council of Scientific and Technical Research, Argentina

Other Gov

Collaborators

Merck Sharp & Dohme LLC

Registry information

Important dates

Study start: 2012
Primary completion: 2014
Study completion: 2014
First posted: Aug 3, 2011
Registry last updated: Sep 23, 2014

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

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This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.