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Reproduction, Fertility and Development Reproduction, Fertility and Development Society
Vertebrate reproductive science and technology
RESEARCH ARTICLE

Opposite effects of high- and low-dose di-(2-ethylhexyl) phthalate (DEHP) exposure on puberty onset, oestrous cycle regularity and hypothalamic kisspeptin expression in female rats

Zhen Yu A , Fan Wang A , Junyong Han A , Rongmei Lu B , Qian Li C , Liangchun Cai B , Bishuang Li C , Jinyan Chen A , Kun Wang A , Wenjin Lin A , Qinghua Lin A , Gang Chen https://orcid.org/0000-0002-8105-2384 A B D and Junping Wen B D
+ Author Affiliations
- Author Affiliations

A Fujian Key Laboratory of Medical Measurement, Fujian Academy of Medical Sciences, Fuzhou 350001, China.

B Department of Endocrinology, Fujian Provincial Hospital, Fuzhou 350001, China.

C Shengli Clinical Medical College of Fujian Medical University, Fuzhou 350001, China.

D Corresponding authors: Emails: chengangfj@163.com; junpingwen@163.com

Reproduction, Fertility and Development 32(6) 610-618 https://doi.org/10.1071/RD19024
Submitted: 15 January 2019  Accepted: 29 October 2019   Published: 11 February 2020

Abstract

Di-(2-ethylhexyl) phthalate (DEHP) is ubiquitous in the environment and has been proposed to lead to reproductive disruption. In this study, we systematically investigated the effects of different doses of DEHP exposure on female hypothalamic–pituitary–gonadal axis development. Female Sprague–Dawley rats were gavaged with vehicle (corn oil) or DEHP (5 or 500 mg kg–1 day–1) during postnatal Days (PNDs) 22–28 or PNDs 22–70. Results demonstrated that the low and high doses of DEHP exerted opposite effects on puberty onset, circulating luteinising hormone, serum oestradiol and progesterone levels, with the low dose (5 mg kg–1) promoting and the high dose (500 mg kg–1) inhibiting these parameters. Significant dose-related differences were also found in the D500 group with longer oestrous cycle duration, lower ovarian/bodyweight ratio, fewer corpus lutea and more abnormal ovarian stromal tissue in comparison with the oil or D5 groups. Molecular data showed that the hypothalamic Kiss1 mRNA expression in the anteroventral periventricular but not in the arcuate nucleus significantly decreased in the D500 rats and increased in the D5 rats relative to the rats in the oil group. These findings suggested that the kisspeptin system is a potential target for DEHP to disrupt reproductive development and function.

Graphical Abstract Image

Additional keywords: AVPV, gonadotrophin-releasing hormone, hypothalamic–pituitary–gonadal axis, neuroendocrinological development, prepubertal exposure, reproductive function.


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