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Tag: "hormones" at biology news

Studies to find better ways to preserve human eggs, ovarian tissue under way

...” Also, if a woman has breast cancer, for example, hormones needed to induce ovulation could be problematic because many breast cancer cells have estrogen receptors. As pieces of a puzzle come together, Dr. Song notes scientists already are developing methods to stimulate ovarian tissue to produce eggs out...

Study shows lizard moms dress their children for success

...he first example in which exposure to the mother's hormones changes such a fundamental aspect of appearance. E...ions more fully, the researchers plan to study the hormones and their effects in the field over several generations of lizards. ...

Researchers demonstrate way to control tree height

... inhibited the action of a class of plant-specific hormones known as gibberellic acids. These compounds are also used as sprays to control the size and fruiting of orchard trees. In trees, the compounds promote the elongation of plant cells – when they are inhibited, the cells do not fully elongate, and plant...

Modified mushrooms may yield human drugs

...eins, such as vaccines, monoclonal antibodies, and hormones like insulin, or commercial enzymes, such as cellulase for biofuels. "Right now medical treatment exists for about 500 diseases and genetic disorders, but thanks to the human genome project, before long, new drugs will be available for thousands o...

St. Jude study shows genes play an unexpected role in their own activation

... as a messenger for a variety of stimuli including hormones and nerve-signaling molecules called neurotransmitters. The St. Jude team showed that each gene that responds to CREB chooses which co-factors, or helper molecules, CREB uses to activate that gene. This finding adds an important piece to the puzz...

Experimental gene therapy 'abolishes' arthritis pain and lessens joint damage

..., enabling them react to the nutrients, toxins and hormones around them. Each receptor is designed to react with a specific signaling molecule, which docks into the receptor like a ship coming into port. The docking changes the shape of the dock to set off chain reactions inside the cell, enabling it to respo...

Salk scientists hammer out a pathway that promotes muscle cell survival in mice

... a cascade of events triggered by exercise-induced hormones and other signals. In this particular pathway, a molecular switch turns on a set of muscle-specific genes in response to exercise by releasing a brake that normally keeps these genes off. Learning how this pathway affects cellular responses may pro...

Premature births may be linked to seasonal levels of pesticides and nitrates in surface water

....S. Nitrates and pesticides can disrupt endocrine hormones and nitric oxide pathways in the developing fetus," he said. "I believe this work may lay the foundation for some of the most important basic and clinical research, and public health initiatives of our time. To recognize that what we put into our ...

Study offers clues to 'Broken Heart Syndrome'

...diomyopathy," Dr. Regnante said. A surge of stress hormones likely plays a role, he said, but it is also possible that a blood clot temporarily blocks a major artery of the heart, then dissolves before being detected during coronary angiography. The most common symptom of broken heart syndrome was chest pa...

New study examines 'brain's own marijuana'

...stress-related behaviors and how stress and stress hormones activate the endocannabinoid system. Haj-Dahmane and his co-investigator, Troy Wood, Ph.D., will examine the relationships between stress, stress-related behavior and addiction using a combination of electrophysiological, pharmacological and neuroc...

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

...terone are present. "These first pictures of sex hormones influencing reward-evoked brain activity in humans... for estrogen and progesterone. However, how these hormones influence reward circuit activity in humans has remained unclear. To pinpoint hormone effects o...

Researchers learn what sparks plant growth

...ficant discoveries involving a key family of plant hormones called brassinosteroids, as well as the receptors for the hormones and the genetic factors that regulate production and uptake of the hormone in the different layers o...

How appetite-stimulating brain cells work overtime during fasting

...n peripheral body tissues, Diano added. Thyroid hormones are known to play major roles during development as well as in adulthood, the researchers said. In adults, the thyroid gland is essential to regulating metabolism. Previous studies had also established a key physiological role for the active thyroid ...

Stress may help cancer cells resist treatment, research shows

...mine whether there is a direct link between stress hormones and changes in cancer cells. While a link betw... role of stress hormones, they suggest that stress hormones may play an important role in prostate cancer." Kulik said the findings have several implication...

Biologists prove critical step in membrane fusion

...fertilization and is particularly critical to keep hormones circulating and brain cells firing. Membrane fusion is also how HIV and other viruses infect cells. But membrane fusion occurs in less than a millisecond, making it difficult to see precisely how it unfolds. Now Brown University biologist Gary Wes...

Natural gut hormone offers hope for new obesity drug

...oom and his team identified the role played by gut hormones in appetite control. These hormones are released when a person eats, acting as neurotransmitters to indicate to the brain to stop eating...

Twin studies reveal genetic components leading to cardiac and kidney disease

... said O’Connor The endothelium secretes several hormones that are markers of how well it is functioning. Release of one of these markers, called endothelin (ET-1), is trigged by a gene that regulates catecholamines, chemical compounds produced in the adrenal gland that are released in reaction to stress. ...

Growth hormone is not the anti-aging bullet for healthy adults

... Growth hormone is among the most expensive of all hormones used for replacement therapy. One physician estimated that a year's supply for an adult with GH-deficiency caused by pituitary disease would cost between $7,500 and $10,000 per year. Estimates of the cost of GH for anti-aging purposes range from $1,0...

Molecular signature may identify cisplatin-sensitive breast tumors

... breast cancers contain receptor molecules for the hormones estrogen or progesterone, and in recent years antiestrogen drugs like tamoxifen have improved outcomes for women with those tumors. About 20 to 30 percent of tumors, some with hormone receptors, have elevated levels of a growth-promoting protein cal...

Protein found to shield pancreatic cancer cells from self-destruction

...nd is temporarily increased in response to certain hormones or stress factors. "However, constitutive expression of this protein in a cancer cell helps confer protection from stress-induced cell death," Mehta says. "We are developing TG2 as a pharmaceutical target and are now working with a mouse model to tha...

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