Mechanisms of Allergen Immunotherapy
Hay fever (seasonal allergic rhinitis) results from allergy to grass and tree pollen. The majority of affected individuals manage well with medication from the Pharmacy or from their general practitioner (GP), but for some severely affected people it severely impacts on quality of life. Less than 40% of those affected in UK general practice feel that these medications achieve good symptomatic control.
Specific immunotherapy or desensitisation is the practice of administering small amounts of allergen to allergic patients in increasing doses. This treatment is highly effective in these patients and furthermore is truly disease-modifying, with benefits persisting long-term, even when the treatment has been completed. Desensitisation is a routine treatment in the UK, Europe and North America. The exact immune mechanisms that underlie this symptomatic improvement are not entirely clear. Dr Tarzi, Professor Frew and Professor Kern have recently developed new methods for the investigation of immune responses to allergens. These methods require relatively small blood samples and may provide useful information about how immunotherapy exerts its effects. In addition to improving the investigators basic understanding of this treatment, such knowledge may drive improvements in the treatment and could be useful for monitoring patients for response. The investigators study proposes to investigate changes in the immune responses to pollen allergens during immunotherapy. Blood will be taken just prior to the first immunotherapy injection and again just prior to the final injection. In this way the investigators will be able to compare the immune responses to pollen allergen before and after treatment.
|Study Design:||Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Basic Science
|Official Title:||An Open Study to Investigate the Effects of Injection Immunotherapy on Allergen-specific T and B Cell Responses in Adult Patients With Seasonal Allergic Rhinitis.|
- What are the changes in T cells associated with immunotherapy? [ Time Frame: 6 months ] [ Designated as safety issue: No ]How does the T cell response change after immunotherapy
|Study Start Date:||April 2012|
|Estimated Study Completion Date:||September 2015|
|Estimated Primary Completion Date:||June 2015 (Final data collection date for primary outcome measure)|
Open label study of changes to cellular responses following immunotherapy
Biological: Allergovit grass or birch
subcutaneous injection of immunotherapy once weekly for 7 weeks prior to birch pollen season.