Expired Study
This study is not currently recruiting Study Participants on ClinicalConnection.com. If you would like to find active studies please search for clinical trials.

Tampa, Florida 33612


Purpose:

The investigators are examining the activation of insulin signaling factors in skeletal muscles of human diabetics. The investigators are characterizing the defects in signaling, and are examining the effects of anti-diabetic agents and exercise on signaling to glucose transport biochemical machinery and whole body glucose disposal.


Study summary:

We have provided clear evidence that insulin activation of all three signaling components, Viz., IRS-1-dependent PI 3-Kinase, atypical protein kinase C (aPKC) and PKB/Akt is defective in diabetic muscle. These defects are best seen when insulin activation is conducted at both half-maximal and maximal stimulation. Moreover, whereas previous studies had shown that treatment with metformin (Met) alone improves aPKC activation, or that treatment with thiazolidinedione (TZD) alone produces increases in activation of IRS-1/PI3K and aPKC when evaluated at maximal insulin stimulation, we have recently found that combined treatment with Met plus TZD for 6 weeks provokes marked increases in insulin effects on all three signaling factors at both half-maximal and maximal insulin stimulation. This work is being prepared for submission for publication. We have also evaluated the improvement in insulin signaling in diabetic muscle 4 hours after acute endurance (one-legged) exercise and found that the responsiveness of aPKC to the lipid PI3K-derived activator, PIP3, was improved. Also increased was the activation by insulin of IRS-2-dependent PI3K, ERK1/2, and downstream protein synthesis machinery, viz., p70S6 kinase and eukaryotic elongation factor eEF2. These effects of exercise would be expected to enhance glucose transport and utilization by muscle, and promote protein synthesis, i.e., an anabolic response.


Criteria:

Inclusion Criteria: - Stable uncomplicated type 2 diabetes - Able to be off oral treatments for 2 months Exclusion Criteria: - Type 1 diabetes - Renal impairment - Cardiovascular disease - Hepatic disease - Insulin therapy needed


NCT ID:

NCT00690755


Primary Contact:

Principal Investigator
Robert V Farese, MD
Department of Veterans Affairs


Backup Contact:

N/A


Location Contact:

Tampa, Florida 33612
United States



There is no listed contact information for this specific location.

Site Status: N/A


Data Source: ClinicalTrials.gov

Date Processed: January 22, 2018

Modifications to this listing: Only selected fields are shown, please use the link below to view all information about this clinical trial.


Click to view Full Listing

This study is not currently recruiting Study Participants on ClinicalConnection.com. The form below is not enabled.