Ctenocephalides canis allergen (Cte c allergen)

Ctenocephalides canis allergens are a group of proteins found in the saliva of the dog flea that serve as the primary triggers for Flea Allergy Dermatitis (FAD), one of the most prevalent dermatological conditions in veterinary medicine. These proteins, such as Cte c 1 and Cte c 2, are injected into the host's dermis during blood feeding to facilitate the meal by inhibiting host hemostasis, including anticoagulation and platelet aggregation (Lappin, 2012; ISBN: 978-1437706604). In sensitized animals, these salivary antigens provoke a complex hypersensitivity reaction involving both IgE-mediated immediate responses and delayed-type cell-mediated responses, leading to intense pruritus, inflammation, and self-trauma. While the primary management of FAD involves the use of ectoparasiticides to eliminate the flea population, the allergens themselves are the therapeutic targets for hyposensitization therapy. This allergen-specific immunotherapy (ASIT) aims to desensitize the immune system through controlled exposure to flea salivary extracts, reducing the clinical severity of the allergic response upon subsequent flea bites (McDermott et al., 2000; PubMed: 10909747). Understanding the molecular profile of these allergens is essential for the development of standardized diagnostic assays and more effective immunotherapeutic formulations for canine patients.

Other names

Dog flea allergenCte c 1Cte c 2Cte c 3Flea salivary antigenCtenocephalides canis salivary protein

Allergen-specific immunotherapy (ASIT) involves the repeated subcutaneous or sublingual administration of Ctenocephalides canis allergen extracts to induce immunological tolerance. This process shifts the host's immune response from a Th2-dominated profile, characterized by high IgE production and mast cell degranulation, toward a Th1 or regulatory T-cell (Treg) response. This shift results in the production of 'blocking' antibodies (IgG), which neutralize the allergen before it can bind to IgE on mast cells, thereby preventing the allergic cascade (Halliwell, 2006; PubMed: 16441311; Akdis & Akdis, 2014; PubMed: 24908224).