Abstract
Carrageenans (CGNs) are extracted from cell walls of certain algae of the Rhodophyta and are gel-forming polysaccharides. There are three kinds of purified carrageenans available—kappa, lambda, and iota CGN. All of them stimulated responding T lymphocytes in both autologous and allogeneic mixed lymphocyte reaction, lambda CGN being the most effective. Silica particles abrogated proliferation of responding cells in autologous and allogeneic mixed lymphocyte reaction by killing human monocytes. However, when 1 mg/ml of CGN was added to silica-added assay system, CGN could induce proliferation of responding T cells even in the absence of monocytes. It was concluded that CGN was a monocyte-independent T-lymphocyte mitogen that was also toxic for human monocytes.
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