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Serum dioxin concentrations and menstrual cycle characteristics.
Brenda Eskenazi1, Marcella Warner, Paolo Mocarelli
1School of Public Health, University of California at Berkeley, Berkeley, CA 94720-7360, USA. exkenazi@uclink4.berkeley.edu
American Journal of Epidemiology
|August 16, 2002
Summary
Exposure to 2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) may affect menstrual cycles in women exposed during development. TCDD exposure was linked to irregular cycles but not cycle length or flow duration in women exposed before menarche.
Area of Science:
- Environmental Health
- Reproductive Toxicology
- Epidemiology
Background:
- 2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) is a persistent environmental contaminant.
- Animal studies indicate TCDD exposure can disrupt estrus cycles.
Purpose of the Study:
- To investigate the association between TCDD exposure and menstrual cycle characteristics in women.
- To assess potential long-term reproductive health effects of TCDD exposure from an industrial accident.
Main Methods:
- A cohort of female residents exposed to TCDD following a 1976 industrial explosion in Seveso, Italy, was studied.
- Serum TCDD levels were quantified from samples collected post-explosion.
- Menstrual cycle characteristics were assessed via interviews conducted 20 years after the explosion.
Main Results:
- Among women premenarcheal at the time of exposure, higher TCDD levels were associated with longer menstrual cycles and reduced odds of scanty menstrual flow.
- No significant associations were found for menstrual cycle length or flow scantiness in women who were postmenarcheal at the time of exposure.
- TCDD exposure was associated with decreased odds of irregular menstrual cycles in both premenarcheal and postmenarcheal groups.
Conclusions:
- Results suggest TCDD exposure may impact ovarian function, particularly when exposure occurs during development.
- The findings are consistent with animal studies and highlight potential developmental sensitivity to TCDD.