RESUMO
Both pyran copolymer and the Burroughs-Wellcome vaccine of Corynebacterium parvum were able to elicit a migratory response by human neutrophils or monocytes when incubated with serum. However, in the absence of serum, neither agent elicited such a response. The generation of the chemotactic factor by pyran was dependent on heat-labile components in the serum, while suggested involvement of the complement sequence. Conversely, the migratory response of C. parvum in heated serum was equivalent to that in normal serum. No specificity for either monocytes or neutrophils was observed.
Assuntos
Quimiotaxia de Leucócito , Monócitos/imunologia , Neutrófilos/imunologia , Polímeros/imunologia , Propionibacterium acnes/imunologia , Copolímero de Pirano/imunologia , Quimiotaxia de Leucócito/efeitos dos fármacos , Proteínas do Sistema Complemento , Meios de Cultura , Humanos , Técnicas In VitroRESUMO
Calves were sensitized to tuberculin and histoplasmin. The delayed-type hypersensitivity skin response to these antigens was produced and the diameter of induration measured. Repeated skin tests prior to filtration demonstrated that the amount of induration produced by these skin tests was closely reproducible. Histoplasmin or tuberculin-coated columns were then introduced into a closed circuit extracorporeal thoracic duct circulation. A significant (P is less than 0.01) reduction or ablation of the delayed-type hypersensitivity response was obtained to the antigen used to coat the column. In contrast, no significant reduction occurred in the skin test response to the other antigen. Repeated skin tests to both antigens after the cessation of filtration showed a gradual rise toward prefiltration levels in the skin test to the filtered antigen. The results of these experiments indicate that a selective population of T lymphocytes can be removed from an in vivo system. The removal of these cells can selectively reduce a delayed-type hypersensitivity skin test response to a particular antigen. These results are consistent with the hypothesis that a type of in vivo selective immunosuppression can be produced by antigen-coated columns when they are placed in an extracorporeal thoracic duct lymph circulation system.