Depressed prostaglandin release from peritoneal cells induced by a T cell adjuvant, lentinan.

PGE and PGF release from peritoneal exudate cells was studied in mice after injection with two beta (1-3) glucans, the antitumor active lentinan and the inactive pachyman, 4 days after injection of both polysaccharides, the spontaneous and phagocytosis-induced PGE and PGF release was markedly suppressed. However, only the immunopotentiator lentinan induced peritoneal exudate cells which exhibited a longer lasting diminished PG release. The data suggest that the T cell adjuvant lentinan may potentiate cellular immune responses by reducing synthesis of immune suppressive prostaglandins from peritoneal exudate cells.