E-Selectin Nasal Instillation to Prevent Secondary Stroke

Overview

This study will determine the maximum safe dose of the experimental drug E-selectin that can be given to stroke patients. E-selectin causes white blood cells called lymphocytes to change so that they prevent clots from forming in the vessels that supply blood to the brain. The drug has been shown to be effective in animal models of stroke. This study will look at the safety of using this experimental drug in nasal instillation form in patients who have had a stroke or transient ischemic attack (TIA). Patients 45 years of age or older who have had a recent stroke or TIA (30 to 120 days before entering the study) due to a clot forming in a vessel that supplies blood to the brain may be eligible for this study. They must be taking at least one medication to prevent clots, such as coumadin, aspirin, ticlopidine, or others. Candidates will be screened with a physical and neurological examination, blood and urine tests, electrocardiogram (EKG), echocardiogram (ultrasound test of the heart), and magnetic resonance imaging (MRI) of the brain. Participants will be randomly assigned to receive E-selectin at a dose level of 5, 15, or 50 micrograms or a placebo (nasal drops with no active ingredient). They will instill a small, carefully premeasured amount (one dose) of fluid in their nose every other day for 10 days (total of 5 doses). This course of treatment will be repeated two times at 3-week intervals. Patients will be followed at 1 month and 3 months with a neurologic examination and blood and urine tests. They will be contacted by phone, fax, or email in between these two visits.

In the United States, stroke is the third leading cause of death and the leading cause of disability. Despite the use of antithrombotic drugs for the secondary prevention of stroke, 10% of patients who experience a cerebral ischemic event will go on to have a stroke within 90 days (Claiborne Johnston et al. 2003). The development of new treatment strategies for the secondary prevention of stroke is an important issue for modern medicine. There is increasing evidence that inflammation at the sites of endothelial activation plays an important role in the pathogenesis of stroke. Control of molecular inflammation at the sites of endothelial activation can be achieved by induction of mucosal tolerance. The induction of mucosal tolerance with repeated low-dose intranasal administration of antigen causes a shift of immune response from proinflamatory T helper type 1(T(H)1) effects to anti-inflammatory immunmomodulatory regulatory T cell (Treg) or T helper type 2 (T(H)2) effects at the sites of inflammation. E-selectin is an adhesion molecule expressed only on activated endothelium in response to proinflammatory cytokines. Objective. The goals of the study are: (a) to test whether repeated administration of low-dose intranasal E-selectin is safe and tolerable and (b) to test whether it can induce mucosal tolerance to this compound causing a shift of immune response from TH1 to TH2 type with production of Treg cells. Study Population. The study population will include 3-50 patients (depending on dose escalation events) plus 0-8 replacement patients (depending on the number of drop outs) with recent (\>30 and \<120 days) occurrence of any type or location of stroke documented by CT or MRI. The final number of patients will be determined by a dose escalation plan described below that may stop early in the accrual process should adverse events arise. Since patients will be required to make serial visits to the NIH clinical center, a functional recovery score of 0-2 on the modified Rankin Scale (i.e. 0 = no symptoms at all; 2 = slight disability: unable to carry out all previous activities, but able to look after own affairs without assistance) is required for inclusion in this study. Study Design. This is a single center, Phase 1, open label, dose escalation trial assessing safety profile of four doses of intranasal recombinant human E-selectin. Outcome Measures. The primary goal of this study is to define the maximum tolerated dose of intranasal instillation of recombinant human E-selection as described I the Study Medications and Drug Administration section. The secondary goal is to determine doses that generate Treg cells or induce immune deviation from TH1 to TH2 type response. The tertiary goals are to determine the presence or absence of antibody to human E-selectin, P- selectin, and L-selectin and the level of endothelial activation markers including von Willebrand factor, soluble E-selectin, VCAM-1, and Thrombomodulin.