جستجوی مقالات مرتبط با کلیدواژه "گونادوتروپین ها" در نشریات گروه "پزشکی"

Background and Objectives The toxic effects of zinc leading to sebaceous gland closure skin eczema and blister have been previously demonstrated in other studies. The aim of this study is to determine the chronic effects of zinc chloride (ZnCl2) on testicular tissues testosterone and gonadotrophins in adult male Wistar rats. Methods Twenty four Adult male Wistar rats were divided in to two groups of study and control with each group consisting of 12 rats. Study group rats received 10 mg/kg interaperitoneal Zinc chloride in normal saline (N.S) every other day for 30 days. Control group rats received N.S during this time. Blood sample for hormonal evaluation were collected from hearts of these rats. The rats were destroyed and their testes were removed and fixed in a 10% formaldehyde and glutaraldehyde solution. Results The results of this study showed a significant decrease in the level of LH and testosterone hormone among the rats in the study group compared to the control group with p< 0.001 and p< 0.01 respectively. Study of fine structure of testicular cells and tissues in the study group rats revealed swelling of mitochondria increase in smooth endoplasmic reticulum vacuolization and lysosomic granules (Autophagic vacuoles) in cytosol of their germinal cells. Conclusion Based on the results of this study consumption of large amount of compounds which contain zinc should be controlled and limited among men. There is a need for further studies to evaluate and determine the reversibility of most hormonal and physiological changes due to usage of zinc containing compounds.

Sodium benzoate is used as a disinfectant agent against some microorganisms in food. The toxic effect of this chemical has been shown in some studies. The aim of this study was to evaluate the effects of sodium benzoate on testicular tissue, gonadotropins and thyroid hormones level in adult (Balb/C) mice. In this experimental study, 18 adult male mice (Balb/C, 10-12 weeks) were divided into three equal groups. Two groups of mice were given sodium benzoate 140 mg/kg/day and 280 mg/kg/day for 60 days respectively. The control animals received tap water. Post-anesthetic blood sampling from left ventricle was used for hormonal measurements. After scarification, the testes were removed and fixed for morphologic studies. Data were analyzed by student t-test. No significant difference was evident concerning weight loss between the control and case groups. The testosterone level was significantly decreased in the case groups (P<0.0001). Also FSH, LH, T3 and T4 levels was significantly decreased in the high dose against the control group (P<0.0001 for FSH, LH & p<0.001 for T3, T4) however, TSH was considerably increased in the high dose and control groups (P<0.001). Ultrastructural study of testicular tissue showed the picnotic nature of germinal cells nuclei and plenty of distended vascular in cytoplasm. Sodium benzoate decreases plasma level of the testosterone, gonadotrophins, T3 and T4. Thus, it is recommended to replace it with other preservatives in drugs and foods.

Infertile women with induction ovulation that have appropriate follicules, need LH surge to release eggs, this is done routinely by HCG. This study designed to compare the pregnancy rate and hyper stimulation syndrome in PCOS patients with GnRH agonist instead of HCG. This descriptive study performed from 2003 to 2004 on 130 infertile patients with PCOS at Babol Infertility Center, Babol, Iran. This study was approved by the local committee of medical ethics. After induction ovulation if patients had 2 Follicules more than 16 mm or 3 folliculs more than 14 mm, we randomly used HCG or GnRH agonist for LH surge. The pregnancy rate and hyperstimulation syndrome evaluated. Data analyzed by spss. There were79 patients in HCG group and 44 patients in GnRH agonist group. There was no significante difference between HCG and GnRH agonist group, with regard to the mean age, infertility duration, number of HCG injection, body mass index and type of infertility (p>0.05). Over all 7(8.9%) patients in HCG group and 3(6.8%) in GnRH agonist group had ovarian hyperstimulation syndrome (p= 0.49). There was pregnancy in 35 (44.3%) patients of HCG group and in 20 (45.5%) patients of GnRH agonist group (p= 0.526). There was no significant difference in the rate of pregnancy and ovarian hyperstimulation in patients with polycystic ovary, having induction ovulation with HCG and GnRH agonist. So it can be concluded we can say that: GnRH can be used instead of HCG for doing LH surge in PCO patients.

Tamsulosin hydrochloride (HCl) is an alpha-1 adrenoceptor antagonist and its ability to inhibit alpha-1 adrenoceptor is more than alpha-2 adrenoceptor. Due to the important therapeutic role of Tamsulosin HCl in benign prostatic hyperplasia (BPH), its side effects on the endocrine axes are also very important. The aim of the present research was to determine the effect of Tamsulosin HCl on serum level of testosterone and gonadotropins, and also on the spermatogengsis in adult male rats. In this experimental study, 40 adult male Wistar rats were randomly divided into 5 groups of 8. The experimental groups received 100, 300, and 600 mg/kg/day of Tamsulosin for 28 days. The sham group were treated with distilled water and the control group received nothing. The blood samples were taken on day 28 and the blood concentration of LH, FSH and testosterone were measured by RIA. Simulataneously, the testes of all rats were removed to assess the possible histological changes. The results were analysed using ANOVA and Duncan tests. The level of significance was considered at p≤0.05. The results indicated that at doses used in our study, Tamsulosin HCl had no significant effect on serum LH and FSH. However, this drug at high concentration was able to decrease the level of testostrone. Also, our histological studies showed a decrease in density of spermatoza in the seminiferous tubules in some sections only at high doses of the drug. According to this research and the results from other similar studies, Tamsulosin at high dose is possibly able to decrease the serum oncentration of testostrone through either the effect on steroidogenesis enzymes in testes, or its inactivation properties on adrenergic and serotonergic systems involved in steroidogenesis. So, it seems that alpha adrenergic receptor blockers possibly have some deleterious effect on spermatogenesis causing infertility in male rats. However further studies need to confirm these results.