During the Islamic lunar month of Ramadan millions of Muslims abstain from drinking and eating from dawn to sunset. The objective of this study was to investigate the effect of intermittent Islamic fasting on reproductive function, hypothalamic-pituitary-thyroid axis and the peripheral metabolism of thyroid hormones in men. We measured serum levels of FSH. LH, testosterone, prolactin, FSH, T4...

Seasonal changes of the thyroid gland structure and hormones secretion was examined in yellowfin seabream Acanthopagrus latus in Persian Gulf (Zangi branch, Musa creek). Thyroid gland composed of follicles scattered around the ventral aorta, near the gills. Follicular cells varied according to secretion of the gland during warm and cold seasons. Thyroid hormones (Triidothyronine [T3] and Thyrox...

Apoptosis plays a critical role in the development and homeostasis of tissues, especially those with high cell turnover such as the lymphoid system. We have examined the effects of thyroid hormones, TSH and TRH, on apoptosis of human T lymphocytes. We found that T lymphocytes cultured with T3 and T4, but not TSH nor TRH, in vitro showed enhanced apoptosis, evidenced by DNA ladder formation and ...

background: polycyclic aromatic hydrocarbons (pahs) such as naphthalene (nap) are organic pollutants that have spread widely in littoral marine ecosystems. we aimed to study the effect of acute and prolonged exposure to naphthalene (nap) on plasma cortisol and thyroid levels in mature and immature liza klunzingeri mulet. methods: in acute stress experiment, the treatment group received 2μl g-1 ...

objective(s): particularly in developing countries, selenium and/or iodine deficiencies are encountered and use of pesticides in agriculture are not well-controlled. fenvalerate is a pyrethroid insectide used in agriculture and has applications against a wide range of pests. this study was designed to evaluate the effects of fenvalerate on hepatic and cerebral xenobiotic metabolizing enzyme act...

The objectives of the present study were to investigate the prevalence of histologic thyroids lesions and the respective thyroid hormones changes of ewes in an endemic goiter region and to find out any impact of this condition on the fetal thyroid structures and serum thyroid hormones. In the present study a total number of 100 pregnant ewes and their fetuses slaughtered at slaughterhouse were...

BACKGROUND Thyroid hormones are important regulators of brain development. During critical periods of development, even transient disorders in thyroid hormone availability may lead to profound neurologic impairment. Animal experiments have shown that certain environmental pollutants, including heavy metals and organochlorine compounds such as polychlorinated biphenyls (PCBs) and dioxins, can in...

II. The Regulation of Thyroid Function in Normal Pregnancy A. The thyroid hormone transport proteins B. The thyroid hormones 1. Total thyroid hormones 2. Free thyroid hormones 3. Peripheral metabolism of thyroid hormones C. The serum levels of thyroglobulin (TG) D. The metabolism of iodine E. The hypothalamic-pituitary control of thyroid function and the role of hCG 1. Hypothalamic-pituitary-th...