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Title: Enhancement of contact sensitization in mice fed a diet enriched in vitamin A acetate. Author: Miller K, Maisey J, Malkovský M. Journal: Int Arch Allergy Appl Immunol; 1984; 75(2):120-5. PubMed ID: 6469384. Abstract: Various methods have been used to enhance the ability of laboratory animals to develop contact sensitivity to so-called weak sensitizers. The present studies have examined whether diets supplemented with vitamin A acetate (VAA) could enhance induction and elicitation of contact sensitivity to oxazolone in the mouse. Application of 0.3% oxazolone to VAA-fed mice resulted in increased DNA synthesis in the draining lymph nodes and increased ear thickness after challenge, in comparison with mice on a stock (standard) diet. Moreover, VAA-fed (but not control) mice were sensitized to 0.03% oxazolone as shown by DNA synthesis, increased arrival of syngeneic 51Cr-labelled lymphocytes in the draining lymph nodes, and ear swelling after challenge. These findings demonstrate that vitamin A enhances delayed hypersensitivity responses, and point to a role for vitamin A in developing an animal model capable of detecting weak contact sensitizers after topical application.[Abstract] [Full Text] [Related] [New Search]