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Backgroud Beta-cypermethrin and emamectin benzoate are widely used for the prevention and control of pests in the greenhouse planting industry, and their combined exposure may increase the accumulation of beta-cypermethrin and emamectin benzoate in organisms and affect human health. Objective Based on the changes in reproductive hormone levels in the hypothalamic-pituitary-ovarian (HPO) axis, to investigate the effect of combined exposure to beta-cypermethrin and emamectin benzoate on the estrous cycle of female mice. Methods Twenty-four healthy adult SD rats were randomly divided into a blank control group, a beta-cypermethrin group (Beta-CYP, 53 mg·m−3), an emamectin benzoate group (EMB, 8 mg·m−3), and a beta-cypermethrin and emamectin benzoate combined exposure group (Beta-CYP+EMB, Beta-CYP 53 mg·m−3 + EMB 8 mg·m−3). Six rats in each group were exposed to the designed treatment protocol by aerosol inhalation 6 d a week for 13 weeks. The general condition of the rats was observed in real time during the treatment. From the 12th week of exposure, a 10-day reproductive tract smear was performed on the rats to observe the estrous cycle. The rats were neutralized on the second day after the end of the treatment protocol, and the ovarian tissues were stained with HE to observe histopathological changes. Serum levels of gonadotropin-releasing hormone (GnRH), follicle-stimulating hormone (FSH), luteinizing hormone (LH), and estradiol (E2) were measured by ELISA. Experimental results were expressed as mean ± standard deviation (\begin{document}$ \overline{x}\pm s $\end{document}). One-way ANOVA was used for comparison among groups, and LSD test for pairwise comparison between groups. The significance level was α=0.05. Results After four weeks of the treatment protocol, the rats in the Beta-CYP group and the Beta-CYP+EMB group continued to be hyperactive and irritable, while the EMB group showed symptoms of mental disorder, decreased activity, and slow response. On the 90th day of the treatment protocol, the body weight of rats in the control group increased to (314.51±2.44) g, and that in the Beta-CYP+EMB group only increased to (253.47±1.50) g. There was no abnormal cellular morphology in the control group; however, small deeply stained nuclei appeared in the Beta-CYP group, the EMB group, and the Beta-CYP+EMB group, and abnormal morphological development of keratinized epithelial cells in the Beta-CYP+EMB group was found. The estrous cycle of rats in the control group was (97.83±4.17) h, and compared with the control group, the estrous cycles of rats in the Beta-CYP group, the EMB group, and the Beta-CYP+EMB group were prolonged to (134.33±7.53) h, (126.50±5.28) h, and (156.00±6.66) h, respectively. The results of ANOVA showed that the numbers of leukocytes (527.17±15.83), keratinized epithelial cells (35.67±4.32), and non-keratinized epithelial cells (70.50±4.51) in the vaginal smears during diestrus in the Beta-CYP+EMB group were significantly lower than those in the control group (752.50±28.89, 50.50±2.74, 101.33±7.92) (P<0.001). The hormone levels of GnRH and FSH in the control group were (5.13±0.59) and (0.76±0.09) IU·L−1 respectively, while the levels in the Beta-CYP+EMB group were increased to (16.86±0.59) and (3.80±0.19) IU·L−1 respectively (P<0.05). The levels of LH and E2 in the control group were (12.93±0.81) IU·L−1 and (22.23±1.44) pmol·L−1 respectively, and the levels in the Beta-CYP+EMB group were decreased to (5.63±0.41) IU·L−1 and (10.45±0.78) pmol·L−1 respectively (P<0.05). Conclusion The combined exposure to beta-cypermethrin and emamectin benzoate may ultimately affect the estrous cycle of female rats by interfering with the secretion of reproductive hormones involved in the HPO axis.
ABSTRACT
Polycystic Ovary Syndrome (PCOS) is a vastly familial, prevalent yet complicated endocrine disorder seen in 5 to 15% of premenopausal women. An estimated one in five ~ 20% Indian women suffer from PCOS. In India, PCOS is a tabooed disorder; If neglected, the condition can prove fatal. However, the past decade has seen the changing discourse in India. PCOS negatively affects reproduction, general health, sexual health, and quality of life. Genetic predisposition of hormonal and non-hormonal factors influence ovary functioning and are responsible for the onset of the syndrome. Hormonal imbalance, metabolic abnormality, and insulin resistance are characteristic features that significantly increase the risk of anovulatory infertility, type 2 diabetes, and cardiovascular diseases. The underlying cause of the path physiology of PCOS is still under the radar, but the derangement of the hypothalamic-pituitary-ovarian axis could be the sweeping reason for the same. PCOS management should address on healthy lifestyle with symptomatic medical therapy and psychological bearing with special emphasis on far reaching side effects and long-term metabolic consequences This review article gives a comprehensive overview of PCOS and the morbidities hooked up with it. It has a notable emphasis on the PCOS guidelines, diagnosis, non-pharmacological, and pharmacological treatments.
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PCOS is a common endocrinopathy among premenopausal women, characterized by hyperandrogenism, anovulation, hirsutism. We evaluated credence of noscapine; in RU486 induced PCOS rat and compared with flutamide, a conventional drug. For 13 days, an oral dose of RU486 [20 mg/kg/day] was administered to Wistar rats exhibiting regular estrous cycle. Varying dosage of noscapine was given to PCOS rats and compared with rats administered flutamide. Cytology of estrous cycle and serum hormone levels (LH, FSH, PRL, estradiol, and testosterone) were measured. Histomorpho-metrical changes, events of apoptosis in theca and granulosa cells were observed using flow cytometry and the mode of cellular death was examined by TUNEL staining. Our findings suggested, normal folliculogenesis in PCOS rats, post noscapine administration (120 mg/kg) in 3-4 days with normal hormonal profile. Theca and granulosa cells undergo massive and marginal cellular degeneration respectively with no G2/M arrest. TUNEL staining confirms the granulosa cells in follicles are major cell type undergo apoptosis in RU486 administered rats. However, low apoptotic DNA fragmentations were found in theca cells. We conclude that the RU486 model is suitable for studies of the metabolic features of PCOS and noscapine appears to be promising therapeutic modality for amelioration of PCOS induced condition.
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To explore the effects of repeated immobilization stress on hypothalamic-pituitary-ovarian axis in female rats. Methods: Forty female SD rats were randomly divided into two groups: control group (n=20) and experimental group (n=20). One group was fed normally, the other group was subjected to incremental load restraint stress. Brake stress once a day in the retainer (starting at 9: 00 a.m.), braking for 2 hours on the first day, increasing load by 0.5 hours a day for two weeks. Body weight, estrous cycle, sex hormone, organ coefficient, pathology and expression of related genes were detected to explore the harm of hypothalamic-pituitary-ovarian axis. Repeated immobilization stress caused weight loss, prolonged estrous cycle, and changed the organ coefficient and morphology of ovaries and uterus. QPCR technique was used to detect the related genes. It was found that the expressions of gonadotropin releasing hormone, pituitary gonadotropin releasing hormone receptor, follicle stimulating hormone and luteinizing hormone mRNA were decreased significantly, while the expressions of ovarian follicle stimulating hormone and luteinizing hormone receptor mRNA were increased significantly. The expression of estrogen receptor mRNA in ovary and uterus was decreased significantly. Repeated immobilization stress may disrupt the estrous cycle by interfering with the endocrine regulation of the hypothalamic-pituitary-ovarian axis, thus damaging the gonadal and reproductive endocrine function of female animals.
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Objective: To investigate the effect of dodder total flavone on polycystic ovary syndrome (PCOS) rat models induced by letrozole. Method: Except the blank group, the other rats were given letrozole 1 mg·kg-1 for 21 consecutive days to replicate PCOS animal model. On the 16th day of the modeling, the estrous cycle was detected by vaginal smear, and rat with persistent keratinization of vaginal epithelial cells were selected as the PCOS model rat. The model rats were randomly divided into model group, Dacin-35 group, and high, middle, low-dose dodder total flavonoids groups. The corresponding drugs were given for 21 consecutive days. At the end of the administration, materials were collected to calculate ovary index, and enzyme-linked immunosorbent assay(ELISA) was used to measure estrogen (E2), testosterone (T), gonadotropin-releasing hormone (GnRH), follicle stimulating hormone (FSH) and luteinizing hormone (LH) levels of serum. The right ovary of rats was stained with haematoxylin-eosin (HE), and the pathological changes were observed by optical microscope. Androgen receptor(AR) expressions in hypothalamus, pituitary and ovary were detected by mmunohistochemistry. Result: Compared with the blank group, serum T, GnRH and LH levels, ovarian index and LH/FSH ratio were significantly increased, while FSH and E2 levels were significantly decreased (PPP2, T, GnRH and LH levels, ovarian index and LH/FSH ratio were significantly decreased in high, middle and low-dose dodder total flavonoids groups (P2 level was significantly increased (PP2 level in PCOS model rats was obviously increased in low-dose dodder total flavonoids group (PPConclusion: Dodder total flavonoids may play a protective role in PCOS model rats by regulating the secretion of estrogen and androgen and affecting the hypothalamic-pituitary-ovary axis pathway.
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AIM: To investigate the effect of Gengnianle Granule on hypothalamic-pituitary-ovarian(HPO) axis in climacteric rats.METHODS: 12-15 months SD female rats were randomized into climacteric group and young control group was selected additionally.After being administrated for thirty days,the level of E_2、P、Te、FSH、LH in serum were examined by the radio-immunity method,the expression of GnRH in hypothalame,the expression of ER in hypothalame and pituitary appendage were examined by the immunohistochemical method. RESULTS: Compared with climacteric group,Gengnianle Granule could increase the level of E_2、P in serum(P
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The function of hypothalamic-pituitary-ovarian axis and the size of uterus and ovary were determined in 57 girls with idiopathic true precocious puberty at various stages of pubertal development. The results showed: 1) The extent of precocious puberty correlated closely with the course of the disease, the degree of bone growth accelaration, the size of uterus and ovary, and the hyperfunctional state of the hypothalamic-pituitary-ovarian axis, however irrelevant to the age at onset of the disease; 2) The hypothalamic-pituitary-ovarian axis in girls with idiopathic precocious puberty started beforehand and was in a state of hyperfunction. There were characteristic changes in their reactive curve in response to LHRH-stimulating test; 3) In comparison with normal pubertal development, the development of internal genitalia in the girls with idiopathic precocious puberty was more immature and the size was relatively smaller.