Metallothionein in human seminal plasma.
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Metallothionein (MT) concentrations were measured in the seminal plasma of 4 fertile and 35 infertile men and in the hydrocele and spermatocele fluids. The relationship between MT content and sperm density, total number of sperm per ejaculate, sperm motility and abnormal form rates, leukocyte count and zinc levels in seminal plasma, as well as the relationship between MT and serum follicle-stimulating hormone, luteinizing hormone, testosterone, and prolactin were examined. MT was not detected in the hydrocele and spermatocele fluids. MT levels were related to zinc levels and to the leukocyte count in seminal plasma, but there was no correlation between MT and the other factors examined. This study supported previous findings that MT was secreted predominantly from the prostate and induced by inflammation of the prostate gland or seminal vesicles; the findings suggest that MT binds mainly to zinc and is one of the zinc-binding proteins in seminal plasma.