Progesterone in Biological News

Effectiveness of progesterone in reducing preterm births may be altered by genetic predisposition

... 2009 New research that may explain why taking progesterone to prevent preterm birth is only effective for ... caproate (or 17P), a synthetic form of the progesterone hormone naturally produced during pregnancy, has ... the theory that genetic variation in the human progesterone receptor plays an important role in the ...

March of Dimes provides $2.7 million in new funding for preterm birth research

... of the onset of preterm labor." Caspase-3 is positively regulated by progesterone and other studies have shown that regular injections of a form of progesterone found naturally during pregnancy can prevent some preterm births in women ...

Breast cancer treatment resistance linked to signaling pathway

... with high Src activation who expressed low levels of estrogen receptor, progesterone receptor and HER2, also known as triple negative breast cancer, as well as subsets expressing the estrogen or progesterone receptors. These patient sets had lower overall survival associated ...

Plastics chemical retards growth, function of adult reproductive cells

... hours in a medium that included 10 micrograms per milliliter of BPA, mouse follicle cells produced about 85 percent less estradiol, 97 percent less progesterone and 95 percent less testosterone. Lower doses of BPA had a less dramatic but still considerable dampening effect on steroid hormone levels. And at ...

Improving livestock productivity in Honduras

... of a given molecule in a biological sample. For reproduction, the most commonly measured molecule has been progesterone. "Measuring molecules like progesterone is important because it gives experts a much better understanding of the reproductive physiology of the animals," according to Mario Garcia Podesta, ...

Open access research celebrated

... ortholog in invertebrates. Medicine Award Weiqi Yan and Guomin Xiao, Hangzhou Normal University Improved outcomes from the administration of progesterone for patients with acute severe traumatic brain injury: a randomized controlled trial Xiao G, Wei J, Yan W, Wang W, Lu Z Critical Care 2008, ...

NIH funds research center for women's reproductive health at Einstein

... Projects and Principal Investigators at Einstein's Specialized Cooperative Center Program in Reproduction and Infertility Research "Estrogen and progesterone Regulation of Human Endometrial Cell Proliferation"Drs. Pollard and Santoro. "Reproductive Hormonal Alterations in Obesity"Dr. Santoro, Maureen ...

Gap junction protein vital to successful pregnancy, researchers find

... physiology professor Milan Bagchi, an author on the study. "One of our major goals is to identify the genes that are regulated by estrogen and progesterone precisely at the time when the embryo implants in the uterine wall." "Connexin 43 has been shown to be in the uterus in many animal systems cows ...

Quest for better treatment for effects of menopause

... two treatments: on the one hand, to raloxifene and, on the other, to a substitutive hormonal treatment combining estradiol (a type of oestrogen) and progesterone (another female sex hormone). The conclusions of Doctor Ruiz del Aguas thesis point to raloxifene, while increasing the antioxidant activity of ...

Molecular 'clock' could predict risk for developing breast cancer

... wanted to see if methylation of RASSF1A and other genes increased over time during the years when the ovaries are actively secreting estrogen and progesterone each month. Dr. Euhus and his team sampled cells from 164 women women with breast cancer, women at high risk of developing breast cancer, and ...

How what and how much we eat (and drink) affects our risk of cancer

... factor for development of the most common type of breast cancer the 70 percent of tumors that are classified as positive for both the estrogen and progesterone receptors (ER+/PR+). Researchers report that even moderate alcohol consumption, defined as one or two drinks per day, increased risk of developing ...

Brain's reward circuit activity ebbs and flows with a woman's hormonal cycle

... estrogen, compared to a phase when estrogen and progesterone are present. "These first pictures of sex ... activity in these areas was also triggered by progesterone levels while women were anticipating rewards ... circuit might be altered by the presence of progesterone during that period. Men showed a different ...

Mother birds increase progesterone to hatch females

... of higher-than-normal levels of the hormone progesterone during the first meiosis -- the cell division ... follicle." To test the influence of progesterone on the sex ratio of offspring, Correa, along with ... at Cornell, experimentally manipulated levels of progesterone in female chickens during the first meiosis. They ...

Female sex hormones play a vital role in defense against sexually transmitted diseases

... as well show that women who use Depo-provera, a progesterone based injectable contraceptive, have particularly ... them to the herpes virus. Both estradiol and progesterone are natural hormones found in the body. The ... that a combination of the hormones estradiol with progesterone provided the best protection in vaccinated mice. ...

Selective marker found to indicate aggressive form of breast cancer

... tumors lack important molecular targets such as the estrogen receptor, progesterone receptor and Her2. This not only makes positive diagnosis difficult, say ... a retrospective study of breast cancer tumors lacking estrogen receptors, progesterone receptors and Her2, DiRenzo and his colleagues found extremely high ...

The influence of the menstrual cycle on the female brain

... gonads (ovaries and testicles), which interact with estrogen receptors, progesterone or androgens. 7. Luteinizing hormone (LH) is a hormone produced by ... and the "statistically" higher the brain activity.) Estrogens and progesterone are not just sex hormones that influence ovulation and reproduction; they ...

Breast stem cells have features similar to 'basal' tumors

... is whether the breast stem cell expresses receptors for oestrogen and progesterone and the marker 'Her2', since these help define the subtypes of breast ... that the breast stem cell in mice is 'triple negative' for oestrogen, progesterone and Her2receptors but does express certain 'basal cell' markers. These ...

Molecular signature may identify cisplatin-sensitive breast tumors

... treatment with the monoclonal antibody Herceptin. The third major subtype is the 15 to 20 percent of breast tumors that have neither estrogen nor progesterone receptors and also do not overexpress HER2. Since these so-called "triple-negative" tumors are treatable with neither Herceptin nor antiestrogen ...

Going To Extremes To Improve Human Health

... environmental heat stress. In the effort to understand why young women are more susceptible to fainting than men, he also studies how estrogen and progesterone influence blood pressure regulation. Minson is the winner of a 2005 American Physiology Society's Outstanding Young Investigator Award (his second ...

By creating molecular bridge, scientists change function of a protein

... the prostate, ovary and urinary tract. What they did was modify the estrogen receptor in a step-wise fashion, Zhao said. They used testosterone and progesterone to build the bridge. The receptor was gradually altered to accept one steroid, then another, until accepting the desired one -- corticosterone, a ...

Controlling protein diversity

... "The question is, 'How is this controlled?'" said O'Malley. He and his colleagues have shown in previous studies that hormones like estrogen and progesterone can change the amounts of proteins made by their target genes. When hormone binds to receptors inside the cells, they are activated to seek out ...