Anisakis simplex and Terranova sp.: inhibition by larval excretory-secretory products of mitogen-induced rodent lymphoblast proliferation.

Excretory-secretory products were collected from supernatants of in vitro cultures of larval nematodes, Anisakis simplex (type I) and Terranova sp. (Hawaii type A). These materials were found to be more potent inhibitors of rodent lymphocyte blast transformation induced by concanavalin A and bacterial lipopolysaccaride than whole worm extracts of the same parasites. Inhibition of blast transformation was a result of cytostatic rather than toxic effects on proliferating lymphoid cells. The material(s) responsible for suppression are greater than 10,000 MW and are heat labile.