title: Effects of two metabolites of ochratoxin A, (4R)-4-hydroxyochratoxin A and ochratoxin alpha, on immune response in mice.
abstract: The metabolites of ochratoxin A, (4R)-4-hydroxyochratoxin A and ochratoxin alpha, were investigated for immunosuppressive properties in BALB/c mice. The standard plaque-counting technique for the estimation of antibody-producing spleen lymphocytes was used. (4R)-4-hydroxyochratoxin A was found to be an immunosuppressor almost as highly effective as ochratoxin A. Doses of 1 microgram of (4R)-4-hydroxyochratoxin A per kg administered to mice caused an 80% reduction in the number of cells producing immunoglobulin M (90% with ochratoxin A) and a 93% reduction in cells synthesizing immunoglobulin G (92% with ochratoxin A). Ochratoxin alpha, however, was ineffective. A possible mode of action is discussed.
mesh_terms: D000818:Animals; D000921:Antibody-Producing Cells / Q000187:drug effects; D006462:Hemolytic Plaque Technique; D007074:Immunoglobulin G / Q000096:biosynthesis; D007075:Immunoglobulin M / Q000096:biosynthesis; D007166:Immunosuppressive Agents / Q000494:pharmacology*; D051379:Mice; D008807:Mice, Inbred BALB C; D009793:Ochratoxins / Q000494:pharmacology*; D013329:Structure-Activity Relationship
chemical_list: D007074:Immunoglobulin G; D007075:Immunoglobulin M; D007166:Immunosuppressive Agents; D009793:Ochratoxins; C000426:5-chloro-8-hydroxy-3,4-dihydro-3-methylisocoumarin-7-carboxylic acid; C025589:ochratoxin A; C025650:4-hydroxyochratoxin A