Increased leucocyte histamine release by Entamoeba histolytica antigen in patients with amoebic abscess of the liver

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Abstract
Leukocytes (basophils) from non-atopic adult subjects living in an area highly endemic with E. histolytica release histamine in a dose-dependent fashion upon in vitro exposure to an antigen of axenically grown E. histolytica (histolyticin). Leukocytes of patients with acute amoebic liver abscess were significantly more sensitive to this antigen than leukocytes of control subjects, including patients that had recovered from amoebic liver abscess. By comparison Concanavalin-A induced histamine release found in patients with amoebic liver abscess and healthy controls suggest an immunological mechanims for histolyticin induced in vitro histamine release. This is also suggested by the inability of histolyticin to release histamine from leukocytes of healthy newborn infants and the significant fall in sensitivity to histolyticin following incubation of leukocytes in acid pH. Histamine and other mediators may contribute locally to the early intense inflammatory reaction observed in tissue invasion by E. histolytica.