ISSN:
1432-0738
Keywords:
Key words AAF
;
Immunosuppression
;
Cell cycle
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Abstract 2-Acetylaminofluorene (AAF) inhibited in a dose dependent manner mouse spleen cell blastogene sis in response to phorbol 12-myristate 13-acetate (PMA)/Ionomycin (Io) activation, the T-cell lectin, concanavalin A (Con A), and following stimulation by alloantigens as measured by the mixed lymphocyte response (MLR). AAF also markedly suppressed the T-cell dependent antibody forming cell (AFC) response to sRBC. AAF was most inhibitory on both the sRBC IgM AFC response and Con A stimulated proliferation when added during the first 24 h following initiation of culture. Direct addition of high concentrations of AAF (100 μM) to spleen cell cultures at 48 h following Con A stimulation produced a very modest inhibition (〈20%) of T-cell proliferation as compared to 90% when added at the time cultures were initiated. Similarly, AAF (75 and 100 μM) produced a greater than 80% inhibition of the in vitro AFC response when spleen cells were sensitized with antigen in presence of AAF. In contrast, no inhibition of the IgM AFC response was produced when AAF (75 μM) was added to spleen cell cultures 48 or 72 h after antigen sensitization. Con A-triggered cell-cycle progression was attenuated at the G1 stage by the addition of AAF (50 and 100 μM) with no inhibition of S to G2/M phase transition. These results suggest that the mechanism of AAF-mediated immune suppression is through a blockade of cell cycle progression from G1 to S phase.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s002040050183
