Estrogenicity relative

Substance Aquatic toxicity Estrogenicity (relative potency to NP)a... 

EM. Bickoff, A.L. Livingston, A.P. Hendrickson, A.N. Booth, Forage estrogens, relative potencies of several esfrogen-Uke compounds fotmd in forages, J. Agric. Food Chem. 10 (1962) 410-412. 

Aromatase inhibitors are relatively well tolerated however have a number of distinct side effects are observed that stem from the state of estrogen deprivation induced by aromatase inhibitors. Side effects include hot flashes, joint and muscle aches, vasomotor symptoms and vaginal dryness. Variable effects of aromatase inhibitors on lipid levels have been observed. Trials comparing third generation aromatase inhibitors to tamoxifen have also repotted an increased risk of cardiovascular events in the group receiving aromatase inhibitors. 

As under most circumstances progesterone action will hold primacy over estrogenic effects, the cervical mucus, endometrium, and probably the fallopian tubes reflect progestational stimulation. The cervical mucus becomes thick and viscous and thus impervious to spermatozoa. The endometrium is in a state that is not receptive for implantation of a fertilized egg. Probably, the progestational impact on the secretory activity and peristalsis in the fallopian tubes also assists the general contraceptive effect. It is difficult, however, to assess the relative contribution of the various effects to the... 

In vivo studies in animals suggest that endosulfan may disrupt normal reproductive hormone levels in male animals, but that it is not an endocrine disrupter in females. Persistent depressed testicular testosterone was seen in male rats after intermediate duration oral exposures to endosulfan. In ovariectomized female rats, orally administered endosulfan did not induce normal development of female reproductive tissues, and in female mice and immature female rats, acute parenteral exposure to endosulfan did not affect several endocrine-related end points. In vitro studies have evaluated endosulfan for estrogen receptor (ER) and cytosolic protein binding affinity, ER-mediated reporter gene expression, estrogenic induction of cell proliferation, and alteration of relative abundance of active estradiol metabolites. Overall, in vitro evidence in favor of endosulfan estrogenicity indicates relatively weak potency compared to 17[3-estradiol. Apparently contradictory results were reported in different... 

Thorpe, K.L., Cummings, R.I., and Hutchinson, T. et al. (2003). Relative potencies and combination effects of steroidal estrogens in fish. Environmental Science and Technology 37, 1142-1149. 

The estrogens are a family of hormones synthesized in a variety of tissues. 17P-Estradiol is the primary estrogen of ovarian origin. In some species, estrone, synthesized in numerous tissues, is more abundant. In pregnancy, relatively more estriol is produced, and this comes from the placenta. The general pathway and the subcellular localization of the enzymes involved in the early steps of estradiol synthesis are the same as those involved in androgen biosynthesis. Features unique to the ovary are illustrated in Figure 42-7. 

Excessive hair growth (hirsutism) and acne also may be present owing to relative androgen excess compared with low estrogen levels. 

Lattier D, Gordon D, Burks D, Toth G (2001) Vitellogenin gene transcription a relative quantitative exposure indicator of environmental estrogens. Environ Toxicol Chem 20 1979-1985... 

Women >55 years or premature menopause without estrogen-replacement therapy Family history of premature CHD (definite myocardial infarction or sudden death before 55 years of age in father or other male first-degree relative or before 65 years of age in mother or other female first-degree relative) Cigarette smoking... 

Table 1.1. Relative binding affinity of ligands to estrogen receptors a and/3...

---