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Tag: "hormone" at biology news

Mother birds increase progesterone to hatch females

...t the presence of higher-than-normal levels of the hormone progesterone during the first meiosis -- the cell ... but we decided to look at progesterone, the major hormone produced by the female bird's preovulatory follicle." To test the influence of progesterone on the ...

Research shows smoking adds a decade to reproductive age of IVF patients

...which was begun in 1995 to examine late effects of hormone stimulation. The team investigated the success rate of the first cycle of treatment in 8,457 women, analysing information on reproduction and lifestyle factors, combined with medical records of IVF treatment from 1983 to 1995. ICSI cycles were not ev...

Second messenger NAADP shows fast, dose-related impact on satiety cycle

... were chosen because they released a chemical ?the hormone serotonin -- in the brain that controls satiation,...ADP production," Yamasaki said. In contrast to the hormone cholecystokinin, the neurotransmitter acetylcholine failed to affect NAADP level, even when applied ...

Mice brains shrink during winter, impairing some learning and memory

...n said he and his colleagues believe it may be the hormone melatonin which controls the changes in brain size and function in mammals such as these white-footed mice. Scientists know that levels of melatonin are associated with seasonal changes in daylight. Melatonin is also found in humans, and that's one ...

Stem cells in bone marrow replenish mouse ovaries

...of menopause and could represent an alternative to hormone replacement therapy. Finally, the researchers would like to find out whether these stem cells could be coaxed to produce eggs in the laboratory, potentially providing a new source of eggs for therapeutic cloning. Johnson et al.: "Oocyte Generation i...

Researchers develop promising new gene network analysis method

... protein, which could be switched on or off by the hormone treatment tamoxifen. One batch of cells was treated with tamoxifen, then harvested one, two, four, eight and 16 hours later. Another batch of cells didn't get the drug but were harvested during the same time frame. Analysis of gene activity generat...

By creating molecular bridge, scientists change function of a protein

...on of the human estrogen receptor alpha, a nuclear hormone receptor mostly expressed in 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 ...

Newly discovered genetic disease sheds light on body's water balance

...t encodes the V2 receptor (V2R) for vasopressin, a hormone that instructs the kidneys to retain water. Neithe...wo infants, they found no detectable levels of the hormone in either child's bloodstream. They concluded that some other mechanism was disrupting fluid homeost...

Scientists find microRNAs regulate plant development

The plant hormone indole-3-acetic acid (IAA), commonly referred to as auxin, plays a major role in regulating plant growth and development. Auxin influences development by affecting the expression of numerous genes that control the processes of cell division and cell ...

Study shows how retinoic acid enters a cell's nucleus

...ucture and amino acids that flip when exposed to a hormone or a drug. Noy currently is working with an ILBP t...ucleus and promote cancer, perhaps by blocking the hormone that switches on its NLS. In previous experiments with mice, Noy and her colleagues showed that by ...

Scientists find that protein controls aging by controlling insulin

...ood and binding to cells. Therapies based on this hormone could prove to be a way to extend life or slow its... researchers were especially interested in how the hormone affected insulin, because making an animal resistant to insulin increases its lifespan ?a phenomenon...

University of Nevada, Reno research team discovers hormone that causes malaria mosquito to urinate

...Methoprene, which has the same effect as an insect hormone called juvenile hormone, also stops the insect from reproducing. It is being used heavily throughout the United States to help prevent the spread of West Nile Virus. Schooley's contribution to the development of methoprene was to prove that it is ha...

New Discovery May Help Doctors Treat Infertility

...these studies. Years of study have shown that the hormone estrogen plays an important role in a variety of systems, most especially female reproduction. However, it was generally thought that there was only one receptor, the alpha receptor, that responded to estrogen. It wasn’t until 1996 that the second re...

Thinking the pain away? Study shows the brain's painkillers may cause 'placebo effect'

...out the impact of chronic pain, mood disorders and hormone variations, which can also affect the endorphin system. In addition to Zubieta, the research team included MBNI members Joshua Bueller, Lisa Jackson, David Scott and Janyun Xu; radiology professor Robert Koeppe, Ph.D.; Thomas Nichols, Ph.D., an ass...

Endocannabinoids ?the brain's cannabis ?demonstrate novel modes of action to stress

...docrine stress response. One explanation for this hormone feedback regulation of the stress response might b... the hypothalamic neurons serve to rapidly inhibit hormone secretion from the pituitary gland, providing a rapid negative feedback mechanism for the regulation...

Insulin pulses keep the liver lean

Insulin, a hormone long recognized as a generator of fat, also keeps ... an organ frequently flooded with the fat-building hormone normally stays trim and also suggests new dietary strategies and treatments to avoid fatty liver, a ...

Fruit fly studies open new window on cancer research

...teins that enhances the sensitivity of a cell to a hormone that can trigger abnormal growth and cancer. Their discovery could lead to a completely new approach to tackling some cancers and the development of new drugs to stop uncontrolled growth in a wide variety of tumour cells. The researchers at the Univ...

NIH renews network focused on how genes influence drug responses

...rences explain variable responses to tamoxifen and hormone treatments frequently prescribed to treat breast cancer. (David A. Flockhart, M.D., Ph.D., Indiana University School of Medicine) The Pharmacogenetics of Membrane Transporters --$15 million provided by NIGMS, NCI, and NIMH to study how dru...

Slipping past the blood brain barrier: Research shows potential treatment for brain cancer

...poses of the hypothalamic growth hormone-releasing hormone usually are to trigger the hormone that makes children grow and affect how glucose is used in adults. Researchers found that the P-g...

Penguin chicks exposed to human visitors experience spike in stress hormone

... a significant spike in levels of a stress-related hormone compared to chicks hatched in areas not visited by...ured and blood was drawn to measure the level of a hormone called corticosterone. The first sample was obtained within three minutes of capture to establish a ...

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