Abstract
T lymphocytes from immune guinea pigs produce clusters in vitro with macrophages exposed to soluble protein antigens. The formation of clusters is antigen specific. Cultures containing macrophage-lymphocyte clusters produced in response to purified protein derivative of tuberculin were treated with inhibitors of macromolecular synthesis and of microfilament and microtubule systems. Cytosine arabinoside, puromycin, actinomycin D, cycloheximide, cytochalasin B, and colcemide were used. The formation of clusters is independent of DNA synthesis. Microfilaments and microtubules are needed in the formation but not in the maintenance of clusters. Protein or RNA synthesis or both are needed in the formation of clusters. Finally, continuous protein synthesis is necessary for the maintenance of clusters.
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