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Tag: "hormonal" at biology news

Researchers find gland that tells fruit flies when to stop growing

...rows during the larval stage. The gland then sends hormonal signals when it senses the fly has reached a size appropriate to enter adulthood. The scientists found they could use the pathway that sends insulin to a fly's cells to genetically manipulate the size of the prothoracic gland, part of a more complex...

Bigger brain size matters for intellectual ability

...n what protective factors, which could be genetic, hormonal or environmental, operate in women. It remains to be determined what the contribution of nature and nurture are to this cerebral size relationship with intelligence, Witelson said. She added that the results point to the need for responsibility in c...

Max Planck researchers make a breakthrough in plant stem cell research

...in turn carry out a particularly important task in hormonal regulation: they are part of a negative feedback loop, by which the growth-inducing plant hormone cytokinin limits its own influence. The study shows that the ARR genes play a direct role in regulation of the stem cell pool. The hormone itself insti...

Targeted drug delivery achieved with nanoparticle-aptamer bioconjugates

...ired. Treatment can involve surgery, radiotherapy, hormonal treatments and chemotherapy (severe cases). 3 Pros...e advanced cases are treated with radiotherapy and hormonal therapies such as the anti-androgens. In patients with metastatic disease where the cancer has sprea...

Researchers use 'trickery' to create immune response against melanoma

...ired. Treatment can involve surgery, radiotherapy, hormonal treatments and chemotherapy (severe cases). 3 Pros...e advanced cases are treated with radiotherapy and hormonal therapies such as the anti-androgens. In patients with metastatic disease where the cancer has sprea...

Researchers uncover mechanisms of estrogen in promoting cell death in breast cancer

...y may overcome resistance to certain breast cancer hormonal therapies. The study appears in the December 7 iss... When cancer treatments such as chemotherapy or hormonal therapy fail to cause tumor regression, the cause is often a malfunction of a natural pathway called...

Hormonal male contraception reversible after few months for all men

With hormonal male contraception likely to be available in the n...ssurance that the previously described efficacy of hormonal male contraceptives is coupled with highly predictable recovery to semen characteristics that are co...

Learning and memory stimulated by gut hormone

...rformance. It is however too early to speculate if hormonal links between eating and learning are involved in that phenomenon." Horvath said that high ghrelin levels or administration of ghrelin-like drugs could also protect against certain forms of dementia, because aging and obesity are associated with a ...

'Executive' monkeys influenced by other executives, not subordinates

... use drugs and genetic analysis to figure out what hormonal and/or genetic influences determine who becomes th...es. And, we can explore whether such influences as hormonal levels, particularly testosterone, influence ranking. For example, we can manipulate testosterone le...

Clock molecule's sensitivity to lithium sheds light on bipolar disorder

... because feeding behavior is on a daily cycle, and hormonal activities that regulate this are circadian," says senior author Mitch Lazar, MD, PhD, Director of the Institute for Diabetes, Obesity, and Metabolism at Penn. "Many studies, including those here at Penn, suggest a relationship between the human circ...

St. Jude projects 90 percent cure rate for ALL

...Irradiation of the brain can cause second cancers, hormonal disturbances and disruption of intellectual development as the child grows. So our omission of the use of irradiation should further reduce acute and long-term toxic side effects and improve outcome." Coupled with the successes of the recent past, f...

Worm hormone discovery may aid fight against parasitic disease

...lled a ligand, acts like a hormone, the first such hormonal ligand identified in C. elegans. Like a key fitti...and reproduce. When the researchers blocked that hormonal signal by engineering mutant worms that couldn't manufacture the ligand, however, the mutants' devel...

Yale researchers find environmental toxins disruptive to hearing in mammals

...dditionally, TBT is known to damage the immune and hormonal systems of marine mammals. In this study on guinea pigs, Santos-Sacchi tested whether TBT or salicylate, which is a chemical that occurs naturally in plants and is a component of aspirin, interfered with the guinea pigs' ability to hear. He found t...

Viagra improves high altitude exercise performance up to 45% for some

... Pike's Peak, Colorado, participants showed marked hormonal changes at altitude. These changes facilitate oxygen delivery. However, this benefit is suppressed when individuals don't eat enough and the body shifts focus to store more energy, Friedlander explained. That study appears in the June issue of the Am...

New genetic test for breast cancer

...tify which patients can be adequately treated with hormonal therapy alone and which patients will truly benefi...is surgery to remove the tumor, plus radiation and hormonal therapy, which cures about 80 to 85 percent of patients. Adding chemotherapy can further reduce the...

Sleep deprivation doubles risks of obesity in both children and adults

...ead to obesity through an increase of appetite via hormonal changes caused by the sleep deprivation. Lack of sleep produces Ghrelin which, among other effects, stimulates appetite and creates less leptin which, among other effects, suppresses appetite. However he says more research is needed to understand the...

Jefferson scientists find aging gene also protects against prostate cancer development

...ts resistant to current forms of treatment such as hormonal therapy. Such therapy focuses on inactivating the ...from prostate cancer patients who are resistant to hormonal therapy and showed that SIRT1 blocks receptor activity, halting cancer growth. “We systematically te...

Buildup of damaged DNA in cells drives aging

...NA grow old rapidly and have physical, genetic and hormonal profiles very similar to mice that grow old natura...om their physical symptoms, to their metabolic and hormonal changes and pathology, right down to the level of similar changes in gene expression," said correspo...

Temperament linked to onset of cancer and early death in female rats

...resome rats, and that disruption could account for hormonal differences linked to the development of cancer earlier, the scholars found. There was no difference in the length of time between onset of cancer and death in the two set of rats, however, the scholars found. Because the findings have identified ...

Pleasure and pain: Study shows brain's 'pleasure chemical' is involved in response to pain too

...ation. Now, the team is working to examine the hormonal and genetic factors that may be different between people whose dopamine systems responded differently to pain. They also have recently received funding from the National institute of Drug Abuse to study individual variation in the effects and use of ...

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