Rheumatoid Arthritis
Conditions
Keywords
Rheumatoid Arthritis
Brief summary
Heart disease is the major contributor of early death in rheumatoid arthritis (RA) and is not influenced by traditional risk factors. Blood vessel dysfunction has been associated with heart disease and complications such as heart attack. The vessel dysfunction is thought to be mediated in part to inflammation. RA patients have evidence of vessel dysfunction seen on ultrasound that improves after medications are given. The purpose of this study is to evaluate patients with controlled or uncontrolled rheumatoid arthritis to determine if there is a difference in the protein expression in the cells that line the blood vessels compared to healthy people.
Detailed description
The study will consist of a cross sectional analysis of venous endothelial cells in rheumatoid arthritis patients who have controlled or uncontrolled disease and healthy controls. We will collect venous endothelial cells by placing an IV in antegrade position in the forearm and a thin wire will be inserted to collect the cells from the inner lining of the vein. The cells will processed and stained for markers of endothelial function and oxidative stress including endothelial nitric oxide synthase (eNOS), phospho-eNOS, nuclear factor kappa B (NFκB), and nitrotyrosine using immunofluorescence technique. Flow mediated dilation (FMD) by ultrasound of the brachial artery on the contralateral arm will be used as an additional marker of endothelial function. A blood sample will be taken for analysis of inflammatory markers (sedimentation rate, C-reactive protein) and cytokine analysis (IL-1, IL-6, TNFa) by cytokine bead array and flow cytometry.
Interventions
None listed
Sponsors
American Heart Association
Bristol-Myers Squibb
University of Texas Southwestern Medical Center
Study design
Observational model
CASE_CONTROL
Time perspective
CROSS_SECTIONAL
Eligibility
Sex/Gender
ALL
Age
18 Years to 75 Years
Healthy volunteers
Yes
Inclusion criteria
Rheumatoid arthritis: * Age 18-75 years * Rheumatoid arthritis defined by 1987 American College of Rheumatology criteria * Attending clinic at University of Texas Southwestern Aston Clinic for Rheumatology or Parkland Arthritis Clinic. Healthy controls: \- Age 18-75 years.
Exclusion criteria
Rheumatoid arthritis: * Insulin dependent diabetes * Cardiovascular or Cerebrovascular disease * Tobacco use in last 24 months * Uncontrolled blood pressure * Uncontrolled cholesterol * Pregnant or nursing * Prednisone greater than 10mg per day * Stable methotrexate dose for less than 4 weeks * Undergoing Infliximab infusions Healthy controls: * Insulin dependent diabetes * Cardiovascular or Cerebrovascular disease * Tobacco use in last 24 months * Uncontrolled high blood pressure * Uncontrolled cholesterol * Pregnant or nursing
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Endothelial cell protein expression by immunofluorescence microscopy of endothelial nitric oxide synthase, nitrotyrosine, nuclear factor kappa B. | Cells are immediately processed following extraction and placed in -80 degree C freezer. Cells are then analyzed by immunofluorescence microscopy in batches of subjects. Patient is followed-up 24 hours after by phone. | Immunofluorescence microscopy of frozen endothelial cells will be processed in batches to reduce bias. Cells are assessed for individual protein expression at study entry. Repeated collection of cells will not been done. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Serum cytokines analysis by cytometric bead array | Measured once upon enrollment into study. Patient is followed-up 24 hours after by phone. | Interleukin-1, Interleukin-6, Tumor Necrosis Factor -alpha |
| Flow mediated dilation assessed in the brachial artery by ultrasound | Measured once upon enrollment into study. Patient is followed-up 24 hours after by phone. | — |
Countries
United States
Outcome results
None listed