Premium
Malaria Antigens Stimulate Neopterin Secretion by PBMC and U937 Cells
Author(s) -
Facer Christine A.
Publication year - 1995
Publication title -
microbiology and immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.664
H-Index - 70
eISSN - 1348-0421
pISSN - 0385-5600
DOI - 10.1111/j.1348-0421.1995.tb02190.x
Subject(s) - neopterin , peripheral blood mononuclear cell , antigen , biology , plasmodium falciparum , u937 cell , immunology , secretion , monocyte , interferon gamma , virology , immune system , malaria , cell culture , in vitro , endocrinology , biochemistry , genetics
Lysates of Plasmodium falciparum parasitized human erythrocytes stimulate U937 cells to secrete neopterin during a 48 hr co‐culture period. Neopterin secretion by U937 cells was enhanced by the addition of human interferon gamma (IFN‐γ). Several P. falciparum antigens, ‘FC27’ (a synthetic ‘S’ antigen), Ag16 (a recombinant ‘S’ antigen) and Ag44/RHOP3 (a recombinant merozoite rhoptry protein), also activated U937 cells to neopterin secretion and produced a similar effect on peripheral blood mononuclear cells (PBMC) from 2 of 3 normal healthy donors cultured with the antigens for 7 days. Plasma from six Nigerian malaria patients contained high neopterin concentrations ranging from 5.06 to 14.17 ng/ml. This preliminary pilot study lends support for further investigation incorporating a larger number of malaria patients and further culture experiments with U937 cells and PBMC with the aim of defining the cause and source of the large quantities of plasma neopterin produced in this infection.