title: Effects of cyclophosphamide on the expression and induction of delayed hypersensitivity.
abstract: Erythematous delayed reactions without induration, presumably assigned to Jones-Mote type, were characterized by the resistance to treatment with cyclophosphamide (CY) before elicitation or immunization in guinea pigs immunized with BGG in IFA or CFA. CY-treatment before elicitation converted delayed erythematous reactions from negative to positive at late intervals after immunization with BGG in IFA. Such a treatment augmented erythematous delayed reactions in animals immunized with BGG in CFA, but abolished induration at the reaction sites. CY-treatment before elicitation or immunization reduced the numbers of basophils at the reaction sites, although erythematous delayed reactions were augmented. Effector T cells responsible for delayed erythematous reaction without induration appear to persist for a long period of time after immunization in the presence of antibody production or tuberculin hypersensitivity and the expression of their function may be inhibited by suppressive mechanisms.
mesh_terms: D000818:Animals; D001491:Basophils / Q000473:pathology; D003520:Cyclophosphamide / Q000494:pharmacology*; D005260:Female; D005620:Freund's Adjuvant; D006168:Guinea Pigs; D006968:Hypersensitivity, Delayed / Q000209:etiology* / Q000276:immunology; D007114:Immunization; D007958:Leukocyte Count; D008263:Macrophage Migration-Inhibitory Factors / Q000096:biosynthesis; D012882:Skin Tests; D005719:gamma-Globulins / Q000276:immunology
chemical_list: D008263:Macrophage Migration-Inhibitory Factors; D005719:gamma-Globulins; D003520:Cyclophosphamide; D005620:Freund's Adjuvant