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• W2332292927 abstract "Abstract Addition of N 6 , O 2 ′-dibutyryl cAMP (DbcAMP) to keyhole limpet hemocyanin (KLH)-primed rabbit lymph node cells for 1 hr, followed by its removal and the addition of KLH, had no effect on the subsequent antibody response, whereas addition of KLH for 1 hr followed by DbcAMP resulted in a 100% enhancement of antibody synthesis. Addition of cholera enterotoxin (CT), which rapidly and irreversibly binds to lymphocytes and activates adenylate cyclase, either before or after the addition of antigen, elevated the antibody response by 100%. These results suggested that some antigen-induced event(s) may be required for DbcAMP to exert its enhancing effects on the antibody response. The effect of KLH on the uptake of DbcAMP by KLH-primed lymph node cells was investigated. One and one hundred micrograms of KLH, which induce optimal and supraoptimal antibody synthesis, respectively, promoted maximal uptake of DbcAMP. This induced uptake was first detectable about 12 hr after addition of KLH, and it peaked during 24–48 hr of culture. DbcAMP uptake induced by a brief exposure of KLH (0–1 hr) was equivalent to that observed with long-term KLH addition (0–24 hr). KLH-induced DbcAMP uptake required KLH-reactive lymphocytes and represented active transport. Antibody to rabbit T lymphocytes inhibited this antigen-induced uptake. The mitogens concanavalin A (Con A) (T cells) and goat anti-rabbit Fab' (anti-Fab') (B cells) also stimulated DbcAMP uptake, as did human serum albumin (HSA) and myoglobulin (Mb) when added to homologously primed cells, indicating the generality of the phenomenon. [ 3 H]DbcAMP entered the cells as di- or monobutyryl cAMP with about 40% metabolized to 5′AMP. This uptake could be competitively inhibited by other adenine or guanine nucleotides and nucleosides." @default.
• W2332292927 created "2016-06-24" @default.
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• W2332292927 date "1977-07-01" @default.
• W2332292927 modified "2023-09-24" @default.
• W2332292927 title "Regulation of the in vitro anamnestic antibody response by cyclic AMP" @default.
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• W2332292927 doi "https://doi.org/10.1016/0008-8749(77)90180-0" @default.
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