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Elly Den Hond,¹ Harry A. Roels,² Karel Hoppenbrouwers,³ Tim Nawrot,¹ Lutgarde Thijs,¹ Corinne Vandermeulen,³ Gerhard Winneke,⁴ Dirk Vanderschueren,⁵ and Jan A. Staessen¹

¹Studiecoördinatiecentrum, Hypertensie en Cardiovasculaire Revalidatie Eenheid, Departement Moleculair en Cardiovasculair Onderzoek, Katholieke Universiteit Leuven, Leuven; ²Unité de Toxicologie Industrielle et de Médecine du Travail, Université catholique de Louvain, Bruxelles; ³Dienst Jeugdgezondheidszorg, Departement Maatschappelijke Gezondheidszorg, Katholieke Universiteit Leuven, Leuven, Belgium; ⁴Medizinische Institut für Umwelthygiene, Heinrich-Heine-Universität, Düsseldorf, Germany; ⁵Afdeling Experimentele Geneeskunde, Departement Ontwikkelingsbiologie, Katholieke Universiteit Leuven, Leuven, Belgium

Abstract

Polychlorinated aromatic hydrocarbons (PCAHs) have been described as endocrine disruptors in animals and in accidentally or occupationally exposed humans. In the present study we examined the effect of moderate exposure to PCAHs on sexual maturation. Two hundred adolescents (mean age, 17.4 years) who resided in two polluted suburbs and a rural control area in Flanders (Belgium) participated. We measured the serum concentration of polychlorinated biphenyl (PCB) congeners 138, 153, and 180 and dioxin-like compounds [chemically activated luciferase expression (CALUX) assay] as biomarkers of exposure. School physicians assessed the pubertal development of boys and girls and measured testicular volume. In one suburb near two waste incinerators, compared with the other suburb and the control area, fewer boys (p < 0.001) had reached the adult stages of genital development (62% vs. 92% and 100%, respectively) and pubic hair growth (48% vs. 77% and 100%) . Also, in the same suburb, fewer girls (p = 0.04) had reached the adult stage of breast development (67% vs. 90% and 79%) . In individual boys, a doubling of the serum concentration of PCB congener 138 increased the odds of not having matured into the adult stage of genital development by 3.5 (p = 0.04) ; similarly for PCB congener 153 in relation to male pubic hair growth, the odds ratio was 3.5 (p = 0.04) . In girls, a doubling of the serum dioxin concentration increased the odds of not having reached the adult stage of breast development by 2.3 (p = 0.02) . Left plus right testicular volume was lower in both polluted areas than in the control area (42.4 mL vs. 47.3 mL, p = 0.005) but was not related to the current exposure of the adolescents to PCAHs. Through endocrine disruption, environmental exposure to PCAHs may interfere with sexual maturation and in the long-run adversely affect human reproduction. Key words: dioxins, endocrine disruption, PCAHs, PCBs, puberty, testicular volume, xenoestrogens. Environ Health Perspect 110:771-776 (2002) . [Online 14 June 2002]

http://ehpnet1.niehs.nih.gov/docs/2002/110p771-776den_hond/ abstract.html

Address correspondence to E. Den Hond, Studiecoördinatiecentrum, Laboratorium Hypertensie, Campus Gasthuisberg, Herestraat 49, B-3000 Leuven, Belgium. Telephone: +32-16-34-5764. Fax: +32-16-34-5763. E-mail: elly.denhond@med.kuleuven.ac.be

Address reprint requests to J.A. Staessen, Studiecoördinatiecentrum, Laboratorium Hypertensie, Campus Gasthuisberg, Herestraat 49, B-3000 Leuven, Belgium. E-mail: jan.staessen@med.kuleuven.ac.be

We gratefully acknowledge the work of the school physicians G. Avonts, A. Nelissen, and N. Nuyt. We thank G. Schoeters and G. Koppen (VITO, Mol, Belgium) for performing the CALUX assay ; W. Dooge for performing the serum hormone analyses ; and S. Van Hulle for coordinating the fieldwork, which was carried out with the assistance of S. Benoy, R. Bollen, V. Boon, I. Calders, L. De Pauw, L. Gijsbers, A. Gijselaar, A. Hermans, M.J. Jehoul, M.P. Lommaert, K. Rombouts, Y. Toremans, G. Thijs, M. Vandermaesen, and R. Wolfs.

The Environment and Health (Milieu en Gezondheid) Study was commissioned and financed by the Ministry of the Flemish Community (Brussels, Belgium) .

Received 10 August 2001 ; accepted 30 January 2002.