Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 11 de 11
Filtrar
7.
J Immunol ; 122(1): 8-11, 1979 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-310837

RESUMO

Extracts of a marine tunicate, Ecteinascidia turbinata (Ete) were previously shown to be capable of suppressing humoral and cellular immune responses in vivo and in vitro. In the present work we have examined the mechanisms of suppression in Ete-treated DBA/2 and BALB/c mice. Treatment with Ete resulted in a significant splenomegaly accompanied by a diminished response to mitogenic stimulation, reaching coincident maxima of effect at days 4 to 6. Spleen size and blastogenic reaction returned to normal at 12 to 21 days. Cells from enlarged spleens inhibited blastogenic responses of normal splenocytes to Con A. Marker studies indicated that the suppressor activity was exerted by cells possessing T lymphocyte characteristics.


Assuntos
Baço/imunologia , Linfócitos T/imunologia , Extratos de Tecidos/imunologia , Urocordados/imunologia , Animais , Soro Antilinfocitário/farmacologia , Contagem de Células , Proteínas do Sistema Complemento , Concanavalina A/farmacologia , Feminino , Ativação Linfocitária , Masculino , Camundongos , Camundongos Endogâmicos BALB C , Camundongos Endogâmicos DBA
8.
Proc Soc Exp Biol Med ; 150(2): 475-8, 1975 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-1208565

RESUMO

Aqueous ethanol extract of a tunicate which was previously found to exert antitumor and immunosuppressive activities in vivo was tested for its effect on normal human lymphocytes in vitro. The extract suppressed the uptake of tritiated thymidine by lymphocytes stimulated with mitogen. This suppressive effect did not require continuous presence of the extract. Treatment of lymphocytes prior to mitogenic stimulation resulted in suppressive effect. The fact that suppression by the extract could also be achieved 24 hr after exposure to mitogen, an interval which was found to suffice for the attainment of maximal commitment for blastogenic transformation indicates that Ete can act at a stage subsequent to the binding of the lectin and elicitation of a mitogenic signal(s).


Assuntos
Antineoplásicos/farmacologia , DNA/biossíntese , Linfócitos/metabolismo , Urocordados/análise , Sobrevivência Celular , Células Cultivadas , Concanavalina A/farmacologia , Humanos , Lectinas/farmacologia , Ativação Linfocitária , Mitógenos , Fatores de Tempo
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA