Tag: "hormones" at biology news

Genetics mutations resulting in delayed puberty are focus of MCG study

...c circumstances that forestall the sex steroids or hormones that transform children into reproductive adults. Boys usually begin puberty by age 10 or 11 and girls age 8 or 9, when the hypothalamus in the brain begins releasing gonadotropin releasing hormone, which stimulates the pituitary gland to make follic...

Age-related decrease in physical ability may be in the genes

...fact that there was such a drastic decrease in the hormones between the young and old mice means they represen...d imply that the genetic pathways for making these hormones is somehow involved in an increased lifespan." Rotter conducted the study with Adrienne Frostholm, a...

Diet may improve cognition, slow aging, and help protect against cosmic radiation

...hemicals that mimic or block the action of the sex hormones estrogen and testosterone may disrupt normal diffe...ast decade, we've also come to understand that sex hormones play an important role in the maturation of other, non-reproductive systems," says Russell Carr, PhD...

Press briefings at The Gerontological Society of Americas 56th Annual Scientific Meeting

...therapy, the latest research data on the impact of hormones on cognitive function, the results of current population studies, future research initiatives, and lessons learned from the past year's experience with MHT studies. (The symposium itself will take place at 8:00 p.m. on Monday, November 24 in San Die...

Egg-sharing does not damage a donors own chance of a baby say UK researchers

...uce too many follicles and eggs as a result of the hormones given to prepare them for fertility treatment. "The premise was that to have enough eggs for egg sharing, doctors may over stimulate the donors' ovaries," said Mr Abdalla. "But, we provided the donors with the standard drug regimen given to all IVF p...

Research collaboration identifies gene essential to puberty

...se to this secretion, the pituitary gland releases hormones called gonadotropins, which in turn stimulate the ovaries or testes to start releasing estrogen and testosterone. Individuals with IHH fail to experience normal puberty but can be treated with a variety of therapies, including subcutaneous injection...

Researchers find genetic link to prostate cancer

...ponse to carcinogens in the environment as well as hormones natural to the body. They found men with prostate...ble to potential carcinogens in the environment or hormones in the body that could trigger the disease." The researchers analyzed a gene called CYPIBI, which i...

Hormonal changes in satisfied and dissatisfied shift workers across a shift cycle

...sleep disturbances alter the regulation of several hormones including cortisol, prolactin and growth hormone in both shift/night workers as well as other populations. Workplace studies have shown that working nights and being on-call are not only related to increased adrenalin release, but also to reduced ...

Genetic clues may show which women face breast cancer risk from HRT

... to find out which polymorphisms might link female hormones to increased breast density. They obtained mammogr...acement therapy in postmenopausal women introduces hormones present in very small amounts in such women. That means additional breast cell multiplication--and p...

As autumn approaches, this chickadee's brain begins to expand

...lack-capped chickadee, Saldanha hopes to learn how hormones help guide the brain's development and reorganizat...gen-making capability is the hippocampus. "We know hormones affect the reorganization of the brain in ovo, in utero and during the early physical development of...

Study shows critical role for steroids in insect embryonic development

...ficant to geneticists in understanding how steroid hormones control cell movements and maturation in general. It also has implications for agrochemical companies in the development of effective pesticides. The research, funded by the Howard Hughes Medical Institute, was conducted over a two-year period. Fin...

New study provides first linkage of fetal alcohol exposure and enlarged heart

...The research results suggest that maternal adrenal hormones might contribute to the cardiovascular changes found in adult female offspring exposed to ethanol in utero. In this study, maternal ethanol ingestion increased the bulk of the left ventricle in the adult FAE female offspring, which was normalized by ...

Estrogen found as link between obesity and breast cancer in postmenopausal women

...r. Hormones in their blood were compared with the hormones from 1,640 cancer-free women who were the same age when blood was donated as the women who developed breast cancer. Obesity was measured by body mass index (BMI), a measure of weight that is adjusted for height. Most of the established risk factors ...

JCI Table of Contents, 15 August 2003

...is and renal failure. EMT is regulated by numerous hormones and growth factors, including tumor growth factor ...ps://www.the-jci.org/press/18637.pdf Thyroid hormones in a binding contract Thyroid hormones are critical for differentiation, growth, and metabolism. T...

Lipids get the spotlight in new NIGMS 'Glue Grant'

...le, one class of lipids, the sterols, includes the hormones estrogen and testosterone which promote our gender-linked physical traits. The Lipid MAPS Consortium is divided into six focus areas. The "lipidomics" focus area will investigate six major groupings of lipids. Other scientific focus areas will cover...

Can female adult obesity be stopped at birth?

...entral nervous system (CNS) targets on which these hormones act. Of the CNS targets, a complex array of hypoth...phagia (gluttony) with resultant obesity. Various hormones orchestrate the synthesis and release of this neuropeptide. For example, pancreatic insulin and lept...

Key step allowing cell migration

...y by which signals from outside cells--provided by hormones and growth factors--can regulate cell locomotion, he said.Understanding the complex cascade of molecular events could become a key to solving the mystery of how to stop cancer cells in their tracks, like nailing shoes to the floor. "Another significa...

U.Va. researchers discover mechanism for the regulation of low-voltage-activated calcium channels

...cell membrane proteins that mediate the actions of hormones within the cell, markedly decrease the flow of calcium through these channels into the cell interior. Because elevation of calcium within cells stimulates cellular activity, regulation of calcium entry is an important way by which the function of ce...

Estrogens as antioxidants reducing heart disease in younger postmenopausal women

...after menopause it has been suggested that ovarian hormones such as estrogen play a role in protecting younger women from the disease. The research from Bhavnani's team supports this idea....

The science of summer haircuts

... hair and other hair whose growth is influenced by hormones called androgens. By contrast, androgens do not affect the growth in other types of hair such as eyelashes and eyebrows. According to Tobin, the 1991 study suggested that androgen-dependent hair growth is faster during the spring and summer months a...

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