Effects of Pine Cone Extract on Serum IgE Levels in Perennial Rhinitis

Overview

The medicinal properties of pinecones have been used for years to treat a variety of illnesses. In the mouse model, an extract of pine cones, poly-phenylpropanoid-polysaccharide complex (PPC), has been shown to reduce total serum IgE levels as well as decreased production of IL-4, a cytokine associated with allergic disease. In this study, the investigators aim to determine the effects that PPC will have on total serum IgE levels in adult subjects with perennial rhinitis.

The study will be a parallel two-arm, double-blind design. The 80% power calculation was based upon preliminary data showing a greater than 30% reduction of total serum IgE in PPC recipients. This power calculation concluded that each arm will need a population of 18 subjects. These subjects will be recruited from a clinical practice of 4 academic allergists/immunologists. Seasonal allergy information will be recorded but the data will be analyzed for each group without any correction for seasonal effects. Recruited subjects will sign the consent form, undergo a complete physical exam, and have skin testing repeated if historical skin tests data within three years is unavailable. The historical skin tests must have been performed using the same techniques as those used in the study. A prick skin test method using commercially available extracts will be used and the results graded according to standard criteria with measurements of the wheal and flare compared to the results of a positive control with histamine and a negative control of saline. A positive skin test will be defined as a wheal diameter 3 mm larger than the negative control with a flare of greater than or equal to 10 mm. A nasal mucosal sample will also be obtained from the inferior turbinate with a plastic device (rhinoprobe). This sample will be frozen at the time of collection for future analysis. This procedure will be optional for subjects; if they consent it will be performed at each visit After screening, patients will be randomized to either of the two arms (placebo, or 32mg PPC/d). Patients will be instructed to take one capsule via oral route daily for 8 weeks. Subjects will be treated for two months with measurements of total serum IgE at the initial screening/randomization visit and following two months of treatment. Physical examination will be repeated at each visit. A variance of 5 days will be permitted for follow-up visits. Rescue treatment with oral, non-sedating antihistamine will be permitted and number of doses will be recorded at each follow up visit. No nasal sprays will be allowed during the study. If symptoms are extreme, the study subject will be discontinued from the trial.

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Eligibility

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Outcomes