Organochlorines, including pesticides (such as DDT), are ubiquitous in the environment. All humans are exposed to low levels of these compounds. Exposure begins before birth, since the compounds cross the placenta, and continues throughout life. Evaluation of potential health effects of that exposure is essential to understanding what dangers, if any, these compounds may pose to humans. Several studies of health effects of the DDT family of compounds are underway. ? (1) We are studying the relationship of prenatal DDE exposure to anogenital distance (a sensitive measure of prenatal hormone exposure) in newborn boys in southern Mexico. In animals, anogenital distance is a sensitive measure of prenatal hormone exposure. DDE, the most persistent DDT metabolite, has anti-androgenic properties, and exposure to DDE reduces anogenital distance in male rats. Anogenital distance has rarely been studied in humans, so we developed a standard protocol and assessed reliability of the measurements, finding that it could be measured more reliably than other measures in current use. We examined basic determinants of anogenital distance, including measures of overall body size such as birthweight. We are examining the relationship of DDE to anogenital distance.? (2) Our previous work had shown that DDT may adversely affect lactation, shortening the duration of lactation, although the evidence on this point is still inconclusive. We are studying this question in the same Mexican population that is being examined for anogenital distance. Data analysis is in progress.? (3) Previous work had shown a relationship of timing of menopause and DDE exposure. That study used postmenopausal samples to measure DDE; this is not optimal timing for measuring exposure. A new study has been done in mothers of a cohort of children we previously studied. Samples obtained from the mother around the time of childbirth were analyzed for DDE in the previous study. A questionnaire to assess menopausal status was administered. Data analysis is in progress.? (4) In the menopause study, new blood samples were taken from a sample of study participants, and these have been analyzed for DDE and other organochlorines. We are comparing concentrations seen in these samples with concentrations seen in the samples taken approximately twenty years earlier to assess stability of concentrations over time and examine a few potential determinants of change.

Agency
National Institute of Health (NIH)
Institute
National Institute of Environmental Health Sciences (NIEHS)
Type
Intramural Research (Z01)
Project #
1Z01ES040012-07
Application #
7327592
Study Section
(BB)
Project Start
Project End
Budget Start
Budget End
Support Year
7
Fiscal Year
2006
Total Cost
Indirect Cost
Name
U.S. National Inst of Environ Hlth Scis
Department
Type
DUNS #
City
State
Country
United States
Zip Code
Kamel, F; Engel, L S; Gladen, B C et al. (2007) Neurologic symptoms in licensed pesticide applicators in the Agricultural Health Study. Hum Exp Toxicol 26:243-50
Romano-Riquer, S Patricia; Hernandez-Avila, Mauricio; Gladen, Beth C et al. (2007) Reliability and determinants of anogenital distance and penis dimensions in male newborns from Chiapas, Mexico. Paediatr Perinat Epidemiol 21:219-28
Gladen, Beth (2006) Questions regarding the basis of the analyses in study of the relationship of maternal concentrations of dichlorodiphenyl dichloroethylene (DDE) and initiation and duration of breast feeding: extrapolations of organochlorine levels for estimating exposure Paediatr Perinat Epidemiol 20:360-1; author reply 362-4
Ribas-Fito, Nuria; Gladen, Beth C; Brock, John W et al. (2006) Prenatal exposure to 1,1-dichloro-2,2-bis (p-chlorophenyl)ethylene (p,p'-DDE) in relation to child growth. Int J Epidemiol 35:853-8
Gladen, Beth C; Klebanoff, Mark A; Hediger, Mary L et al. (2004) Prenatal DDT exposure in relation to anthropometric and pubertal measures in adolescent males. Environ Health Perspect 112:1761-7
Longnecker, Matthew P; Wolff, Mary S; Gladen, Beth C et al. (2003) Comparison of polychlorinated biphenyl levels across studies of human neurodevelopment. Environ Health Perspect 111:65-70
Gladen, Beth C; Shkiryak-Nyzhnyk, Zoreslava A; Chyslovska, Nataliya et al. (2003) Persistent organochlorine compounds and birth weight. Ann Epidemiol 13:151-7
Gladen, Beth C; Doucet, Josee; Hansen, Larry G (2003) Assessing human polychlorinated biphenyl contamination for epidemiologic studies: lessons from patterns of congener concentrations in Canadians in 1992. Environ Health Perspect 111:437-43
Gladen, B C; Ragan, N B; Rogan, W J (2000) Pubertal growth and development and prenatal and lactational exposure to polychlorinated biphenyls and dichlorodiphenyl dichloroethene. J Pediatr 136:490-6
Longnecker, M P; Gladen, B C; Patterson Jr, D G et al. (2000) Polychlorinated biphenyl (PCB) exposure in relation to thyroid hormone levels in neonates. Epidemiology 11:249-54

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