Tag: "stimulates" at biology news

Heart cells closely control their own oxygen supply

...lls ofthe blood vessels. The angiotensin II, then, stimulates the vessels toconstrict. When oxygen levels fall below 6 percent, the cells secrete adenosine,which acts directly to trigger dilation of the vessels. (For comparison, oxygenconcentration in the air is about 20 percent, substantially higher than theox...

CIIT publishes formaldehyde cancer risk assessment

...f the lack of regenerative cell proliferation that stimulates the mutation process that causes tumors. CIIT researchers used computational flow dynamics (CFD) algorithms with models of human and rat nasal airways in order to predict regional formaldehyde dose. These regional does predictions were in turn linke...

Learning how cell's tiny motor powers its mobility

...encies in transport. In such cases, a therapy that stimulates the transportsystem might be effective in treatment."...

Laser light from Free-Electron Laser used for first time in human surgery

...ctrons to "vibrate" at a specific frequency, which stimulates them to emit a beam of laser light.By varying the energy in the electron beam, an FEL can be tuned to a wide range of frequencies. Thedesign is also capable of generating extremely powerful beams of coherent infrared light. From the beginning, many ...

University of Pittsburgh-led team finds biological reason for women's increased risk of smoking-related lung cancer

... also discovered that nicotine found in cigarettes stimulates expression of the GRPR gene in lung cells. "Our research strongly suggests that women are likely to develop lung cancer after much less smoking exposure than men and much earlier in life, regardless of their smoking history, said Sharon Shri...

Researchers find new mechanism for growing new blood vessels

...e growth factor VEGF and its receptors. Also, PR39 stimulates the expression of receptors for another family of ...elieved to work because the resulting inflammation stimulates angiogenesis. Now, it appears macrophages can also induce angiogenesis through the HIF-1alpha mechan...

Non-toxic peptide blocks spread of prostate cancer in rats

...ceptors on cells surrounding damaged tissue, which stimulates them to invade and repair the injury. The downsi...cancer cells can mutate so that intact fibronectin stimulates them to invade surrounding tissue also. "Cancer is the price we pay for our ability to heal from wo...

Protein that stimulates blood vessel growth also helps repair broken bones

...to heal may one day be set straight by a drug that stimulates the growth of new blood vessels, according to new research from the University of California, San Francisco. So far, however, the growth factor drug has been tested only in mice, and it could be years before it is used in hospitals. These results...

Mice show how to calm anxiety

...mone, corticotropin-releasing hormone (Crh), which stimulates the pituitary gland to release additional hormones. These hormones from the pituitary gland cause the adrenal gland to secrete hormones that stoke the stress response, increasing anxiety, energy and blood pressure, and suppressing immune responses. ...

Sea slug's shopping habits dictated by hunger, scientists report

...a chemical found in most marine invertebrates that stimulates predators -- were quicker to strike than less hungry snails. Higher concentrations of betaine eventually induced biting by the satiated snails, but in general the less hungry snails withdrew their heads, turned and moved away from the food source. H...

Soy protects heart without disrupting hormones: Study

...ed it on human breast cancer cells. Since estrogen stimulates breast cancer cells to produce a special protein, the researchers measured the amount of this protein produced by each urine sample to calculate how much estrogen was present. The total estrogenic activity in the urine of women on soy was actual...

Oxidants play major role in healing of damaged blood vessels

... An increase in oxidants at the site of an injury stimulates this intracellular construction. Likewise, they found that the addition of antioxidants would slow or stop the construction and therefore slow the cell migration and consequent wound heal...

ZymoGenetics discovers potential new therapy for autoimmune diseases

...CI works by capturing a cytokine in the blood that stimulates B cells to make antibodies. In diseased mice treated with soluble TACI, this captured cytokine was unable to act on B cells. The proportion of B cells decreased, and these mice lived longer and had less severe disease symptoms. Researchers are con...

Life and death struggle: Proteins play against each other, bringing balance to immune system

...auses T cells to divide and attack the invader and stimulates "memory" T cells. At the same time that IL-15 production increases, IL-2 controls the proliferation of "memory" T cellscaused by increasing amounts of IL-15by killing some T cells as they divide. "In immune responses," Dr. Marrack said, "the stimul...

Scientists issue telomerase caution

...transcription factor encoded by the c-myc oncogene stimulates telomerase gene expression. Thus, they reasoned that the elevated telomerase expression they observed in the recent study might be a consequence of c-myc oncogene activation. Consistent with this idea, the researchers observed that the expression ...

Sightless cavefish may offer clues to eye growth, Science authors report

...that into the cavefish eye, and watch to see if it stimulates eye growth." As embryos, cavefish such as Astyanax mexicanus, collected in caves beneath northeastern Mexico, begin to form eyes. But, the young lens soon degenerates, so that the cornea, iris, pupil, and other optic tissues that depend on signals ...

DNA test solving Chesapeake's toxic mysteries

...ces only a miniscule amount of toxin, he says, but stimulates "tremendous linkage in cells of the nervous systems." Ultimately, says Oldach, the most important part of the Pfiesteria story may lie in medical studies of the toxicity. He notes, "The most exciting medical aspect is that reversible cognitive defi...

Honey as healer

...removes pus, scabs and dead tissue from wounds and stimulates new tissue growth. "Randomized trials have shown that honey is more effective in controlling infection in burn wounds than silver sulphadiazine, the antibacterial ointment most widely used on burns in hospitals" says Dr. Molan. The significance of t...

Research shows that brain receptor may control obesity

... receptor, called the MC4-R, in the brains of mice stimulates food intake and ultimately causes obesity. "This new research helps us better understand the genetic determinants of obesity, metabolism and the regulation of fat mass, which have been poorly understood in the past. In the future, this type of...

UCSF researchers identify regulator of critical brain messenger, hinting at therapy

...rical impulse down its axon to the terminal, which stimulates a vesicle within the terminal to migrate to the terminal's surrounding membrane. There, it fuses with the membrane, creating a conduit for the release of the neurotransmitters into the so-called synaptic cleft between nerve cells. The released neurot...

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