The Role of Vitamin D in Chronic Urticaria and Angioedema Treatment

Overview

This clinical study was designed based on our hypothesis that vitamin D plays an important role in chronic urticaria and that high dose supplementation with vitamin D in subjects with chronic urticaria will improve clinical response. This clinical study will investigate our hypothesis in three Specific Aims: 1. Determine whether high dosing vitamin D supplementation (4000 IU/day) reduces medication usage (primary outcome) and urticaria severity score (secondary outcome) in subjects with chronic urticaria as compared to low dosing (600 IU/day). 2. Determine if high dosing of vitamin D (4000 IU/day) is safe and well-tolerated in subjects with chronic urticaria with or without baseline vitamin D deficiency. 3. Investigate whether there is an association with serum 25-hydroxyvitamin D levels, vitamin D receptor mRNA expression, and chronic urticaria severity.

The purpose of this pilot, 12 week, clinical research study is to determine if supplementation with Vitamin D will improve the clinical outcome in subjects with chronic urticaria and angioedema (CUA). Vitamin D is a key element in the regulation of immune system responses, and vitamin D could play an important role in the treatment of CUA. Recently, we published that there is an important association with CUA and serum 25-hydroxy vitamin D (25OHD). Namely, vitamin D levels in subjects with CUA were significantly lower as compared to subjects with an alternative allergic disorder, allergic rhinitis. There is now one other observational report that supplementation with vitamin D (50,000/wk) in subjects CUA resulted in clinical improvement; however, there was only one treatment arm and optimal serum 25OHD required to obtain benefit was not investigated. This current study is a double-blinded, prospective, interventional study that seeks to recruit adult subjects with physician-diagnosed CUA and randomize subjects to either the recommended dietary allowance (Vitamin D 600 IU/day) or the recommended upper limit of intake (Vitamin D 4000 IU/day). Subjects will answer a questionnaire to collect information regarding demographics, previous diagnostic tests, medications, and complete an urticaria severity score (USS). Information from the medical record: weight, height, body mass index (BMI), thyroid stimulating hormone (TSH), free thyroxine (T4), thyroid autoantibodies, urticaria autoimmune testing (CD203c results), anti-nuclear antibody (ANA), urinalysis, and allergy skin prick testing, which are part of the CUA evaluation will be obtained. Subjects will have research blood draws for serum 25OHD level, iPTH, calcium, phosphorus, albumin, urine calcium, and vitamin D receptor (VDR) gene expression. All subjects will receive standard-of-care therapy according to the 2009 Third International Consensus Meeting on Urticaria position guidelines. Follow-up visits for medication usage, urticaria severity score, and serum and urine safety monitoring will be at 6 and 12 weeks. The hypothesis of this study is that high dosing of vitamin D will result in clinical improvement in subjects with CUA. The primary clinical endpoint is medication usage, and the secondary outcomes are urticaria severity score and prednisone rescue use. We will explore if threshold serum 25OHD levels correlate and VDR expression correlate to clinical outcomes, and to determine power analysis to conduct a larger scale study. Finally, the study aims to determine if vitamin D supplementation is safe and well-tolerated in subjects with CUA.