Impaired follicular development and endocrine disorders in female rats by prepubertal exposure to toxic doses of cadmium.
Toxicol Ind Health
; 36(2): 63-75, 2020 Feb.
Article
en En
| MEDLINE
| ID: mdl-32279652
Cadmium (Cd) has been associated with several physiological problems including reproductive and endocrine system dysfunction resulting in temporary infertility. The principal objective of this project was to investigate the effects of prepubertal exposure to toxic doses of Cd on puberty onset, the endocrine system, and follicular development. For this purpose, 16 female Sprague-Dawley rats weaned on postnatal day (PND) 21 were randomly divided into 4 groups (n = 4 per group). The treatments were as follows: 0, 25, 50, and 75 mg/kg/day of cadmium chloride (CdCl2) by oral gavage from PND 21 to observation of first vaginal opening (VO). The results demonstrated that prepubertal exposure to different doses of CdCl2 delays the age of VO, first diestrus, and first proestrus via altering the concentrations of estradiol and progesterone. The low level of these steroid hormones contributed to lower differentiation and maturation of follicles and it finally led to reduced ovarian reservoir of follicles and impaired follicular development. The number of atretic follicles and secondary follicles with premature cavity increased in rats that received a high dose of CdCl2, whereas the number of secondary follicles and corpora luteum decreased in the same circumstances. Taken together, these data suggest that prepubertal exposure to toxic doses of Cd delays the onset of puberty via disorderliness in the concentration of steroid hormones and reduces the ovarian reservoir of follicles, as well as folliculogenesis.
Palabras clave
Texto completo:
1
Base de datos:
MEDLINE
Asunto principal:
Ovario
/
Maduración Sexual
/
Vagina
/
Cadmio
País/Región como asunto:
Asia
Idioma:
En
Revista:
Toxicol Ind Health
Asunto de la revista:
MEDICINA OCUPACIONAL
/
TOXICOLOGIA
Año:
2020
Tipo del documento:
Article