The Effect of Levocetirizine on Inflammatory Mediators in Dermatographism

Study Overview
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Brief Summary
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Levocetirizine (Xyzal®), the active levorotatory enantiomer of cetirizine (Zyrtec®), is a FDA-approved drug used in the treatment of symptoms associated with seasonal and perennial allergic rhinitis and chronic idiopathic urticaria. The parent compound, cetirizine was shown to be effective against experimental dermatographism, however no study has been conducted so far on the effect of levocetirizine on the inhibition of dermatographism. It is known that cetirizine is a mast-cell stabilizer and decreases histamine levels and the number of tryptase positive mast cells. Cetirizine inhibits the production of interleukin 8 (IL8) and leukotriene B4 (LTB4) by immune cells - two potent chemoattractants - and induces the release from monocytes of prostaglandin E2 (PGE2), a suppressor of antigen presentation and MHC class II expression. However, the effects of the most active enantiomer levocetirizine on these inflammatory mediators have not been evaluated so far. Therefore, we aim to conduct a study in humans with dermatographism and chronic idiopathic urticaria to evaluate the effect of levocetirizine on the above-mentioned mediators. The study will involve the use of skin microdialysis, a minimally invasive technique to measure inflammatory mediators in the extracellular space in dermis.

Official Title
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The Effect of Levocetirizine (Xyzal®) on the Skin Levels of Inflammatory Mediators Histamine, Serine Proteases, Prostaglandin E2, Leukotriene B4 and Cathepsins in Patients With Symptomatic Dermatographism and Chronic Idiopathic Urticaria

Conditions
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Rhinitis, Urticaria

Intervention / Treatment
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* Drug: levocetirizine or placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients with symptomatic dermatographism and chronic idiopathic urticaria. Adult male and female between 18 to 60 years of age. Signature of informed consent. No known hypersensitivity to levocetirizine or to any of the ingredients of Xyzal® or to cetirizine. Willingness to refrain from other antihistamines, prescription and and over- the-counter cough & cold medications, topical creams, topical steroids and topical immunomodulators, for one week prior to the study. In very severe cases of CIU and dermatographism, based on dermatologist consultation and recommendation, and depending on the half-life of the prior antihistamine medication used, this period may be reduced to 3-4 three days. Rescue medication will be promptly provided if at any time the subjects will experience a significant relapse of their CIU symptoms. Good general health. Ability to understand and comply with the protocol. Females of child-bearing potential must have a negative urine pregnancy test prior to randomization. Absence of another active skin disease that may influence skin evaluation during the study. Exclusion Criteria: Pregnant females, females planning on getting pregnant or breast feeding. Uncontrolled chronic disease such as diabetes. The presence of renal disease with a moderate or severe renal impairment (since Xyzal is primarily eliminated through the kidneys) as documented from medical records or patient history. History of anaphylaxis, angioedema or allergy to Xyzal or cetirizine (Zyrtec). Any systemic disease involving mast cells such as allergic rhinitis, lung disease, asthma or autoimmune collagen disease. Severe vascular or neurological diseases that would impart an asymmetric blood perfusion or an impaired function of the arms.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 60 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Group 1<br>Subjects with chronic idiopathic urticaria exhibiting dermatographism. | Drug: levocetirizine or placebo<br>* oral administration, single tablet, 5 mg.<br>* Other names: Xyzal;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| To evaluate the inhibitory effect of levocetirizine in the induction of dermatographism. To assess the levels of key inflammatory mediators and proteases in the skin during dermatographic reaction, using microdialysis. |  | Time-points are selected within a 5 hours interval, during experimental microdialysis | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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dermatographism, levocetirizine (Xyzal), chronic idiopathic urticaria, dermatographism