American Journal of Epidemiology Vol. 139, No. 3: 272-281
Copyright © 1994 by The Johns Hopkins University School of Hygiene and Public Health
research-article |
Total Serum Testosterone and Gonadotropins in Workers Exposed to Dioxin
From the National Institute for Occupational Safety and Health Cincinnati, OH
Reprint requests to Dr. Marie H Sweeney, Industrywide Studies Branch, Division of Surveillance, Hazard Evaluations and Field Studies, National Institute for Occupational Safety and Health, 4676 Columbia Parkway, R-13, Cincinnati, OH 45226
Human reproductive endocrine data may be an important source of epidemiologic information in regard to the toxic potential of 2,3,7,8-tetrachlorodibenzo-p-dioxm (dioxin). The association of serum dioxin with total serum testosterone, luteinizing hormone, and follicle-stimulating hormone was examined in 248 chemical production workers from New Jersey and Missouri plants and 231 nonexposed neighborhood referents who participated in a medical evaluation in 1987. In linear regression analyses, current serum dioxin was positively and significantly related to luteinizing hormone and follicle-stimulating hormone and inversely related to total testosterone after adjustment for potential confounders (p < 0.05). These trends were also apparent in logistic regression analyses, in which the authors examined the odds ratios of high luteinizing hormone (>28 lU/liter), high follicle-stimulating hormone (>31 lU/liter), and low testosterone (<10.4 nmol/liter) by serum dioxin quartiles. There was a greater prevalence of high luteinizing hormone among workers in the second (odds ratio (OR) = 1.9, 95% confidence interval (Cl) 0.7–5.5), third (OR = 2.5, 95% Cl 0.9–7.3), and fourth (OR = 1.9, 95% Cl 0.7–5.0) quartiles of serum dioxin compared with referents. For follicle-stimulating hormone, the authors observed a greater prevalence of high follicle-stimulating hormone among workers in the fourth quartile (OR = 2.0, 95% Cl 0.7–5.6) compared with referents. Similarly, the prevalence of low testosterone was two to four times greater among workers in the second (OR = 3.9, 95% Cl 1.3–11.3), third (OR = 2.7, 95% Cl 0.9–8.2), and fourth quartiles (OR = 21, 95% Cl 0.8–5.8) than among referents. The trends observed in these data offer human evidence of alterations in male reproductive hormone levels associated with dioxin exposure. The results support the animal literature in which dioxin-related effects have been observed on the hypothalamic-pituitary-Leydig-cell axis and on testosterone synthesis.
dioxins; FSH; LH; testosterone
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