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Tag: "hormone" at biology news

A gene's first 'kiss' sets off that affair known as puberty

...ad been known about what instigates the cascade of hormone secretions that, over time, produces puberty's tel...berty becomes official when gonadotropin-releasing hormone (GnRH) is secreted and sets off a chain reaction of chemical messages. Inside the hypothalamus, nerv...

Poor prenatal nutrition permanently damages function of insulin-producing cells in the pancreas

... In type 1 diabetes, the pancreas cannot make the hormone insulin at all; about 1 million Americans must control this form by taking insulin injections. In type 2 -- a disorder affecting an estimated 18 million Americans -- the pancreas doesn't make enough insulin or the body's cells develop a resistance to...

U-M scientist to talk about tissue engineering at AAAS

...s of tissue engineering. For example, parathyroid hormone is given to patients with osteoporosis, a conditio...ng them fragile and prone to breaking. Parathyroid hormone stimulates bone growth in these patients, and Krebsbach sees potential to use it for similar gains i...

The secret lives of whales

...s. “Some of these are endocrine disruptors ?female hormone mimics that cause serious problems. The whole world is being feminized,?says Payne. Payne’s greatest hope is that in the next decade, the world will have taken heed, and instituted steps to reduce the entry of contaminants to the oceans. ...

Female sex hormones play a vital role in defense against sexually transmitted diseases

...ld suggest vaccination protocols under combination hormone therapy to get the best benefit from the vaccine. ...n the first study, female mice received either the hormone estradiol or progesterone, a combination of both, or nothing at all prior to exposing them to the he...

Poplar trees redirect resources in response to simulated attack

...ed after exposure to jasmonic acid, a potent plant hormone that makes the plant 'think' it's under attack, it partitions more of its carbohydrates to the roots for storage. ...

UCSD researchers maintain stem cells without contaminated animal feeder layers

...in cellular growth and differentiation, as well as hormone secretion, finally shown in additional testing to maintain the undifferentiated state. The study's first author, Gillian M. Beattie, M.S., UCSD Department of Pediatrics and the Whittier Institute, said that "it will be rather simple now to develop a...

Deficiency of growth hormone and IGF-1 reduces cancer and kidney disease, but creates other problems

Deficiencies of growth hormone and similar compounds may reduce cancer and kidney... used a rat model to explore the effects of growth hormone and another compound, IGF-1 (insulin-like growth factor 1) on adult rats and found paradoxical effec...

Opposing fat metabolism pathways triggered by a single gene

... players in the regulatory network are the nuclear hormone receptors (NHRs), which are transcription factors ...eith Yamamoto and colleagues show that the nuclear hormone receptor nhr-49 controls two different aspects of fat metabolism, which interact to form a feedback ...

Bone Density Recovers After Teens Stop Injected Contraceptive

... mineral density by lowering levels of estrogen, a hormone that promotes bone mineral density in women. The findings appear in the February Archives of Pediatrics and Adolescent Medicine. The study was conducted by Delia Scholes, Ph.D., of the Group Health Cooperative in Seattle, Washington, and her colleag...

How the environment could be damaging men's reproductive health

... bearing sperm in semen, and that age, smoking and hormone levels had no effect. "When we compared the 20% o...ntal factors, including those that can disrupt the hormone system, and the role of genetics, lifestyle and other factors." The study found that cryptorchidism...

Controlling protein diversity

...ounts of proteins made by their target genes. When hormone binds to receptors inside the cells, they are activated to seek out target genes. They then recruit the coactivators ?in this case CAPERá and CAPERâ. These coactivators not only cause the gene to begin the process that results in protein production, ...

Iron exporter revealed that may explain common human disorder

...th the disease exhibit a deficiency of hepcidin, a hormone that binds ferroportin and targets it for destruction. Drugs that inhibit or degrade ferroportin might therefore curb the iron overload suffered by those with hemochromatosis, Andrews said. Those with excess iron for other reasons, such as repeated ...

50-year-old Mystery Solved: Protein Tags Regulate Key Ion Channel

...ane proteins key to biology, like transporters and hormone receptors, may also be controlled by SUMO since the binding site is present in those proteins although not yet proven to operate. "Cells are fastidious in the way they regulate activity at their borders," Goldstein added. "Our work shows how sumoyla...

Researchers discover chemical compounds that affect plant growth

...of these resembled auxins, a plant-produced growth hormone involved in gravitropic responses, while two of the four did not work through known auxin pathways. One of the chemicals resembled pyocyanin a product of bacterial metabolism thought to target yeast cell membranes. With chemical genomics, the team co...

Love's all in the brain: fMRI study shows strong, lateralized reward, not sex, drive

...ships. It's in this region where receptors for the hormone vasopressin are critical for vole pair-bonding, or attachment. "Humans have evolved three distinct but interrelated brain systems for mating and reproduction ?the sex drive, romantic love, and attachment to a long term partner," Fisher said, "and ou...

Harmful chemicals may reprogram gene response to estrogen

...ogram" the way certain genes respond to the female hormone estrogen. This genetic reprogramming may determine...ue to DES' ability to influence estrogen, a female hormone that is involved in promoting the growth of tumors by regulating the activity of key genes involved ...

Technique may allow cancer patients to freeze eggs, preserving fertility before starting treatment

...e oocyte, which means a woman must have 14 days of hormone treatments to stimulate mature egg production. Thi... estrogen, such as breast cancer. In addition, the hormone treatments require delaying the start of cancer therapy, which may not be an option for every patien...

At long last, scientists figure out how plants grow

...ntists have known since 1885 that the plant growth hormone auxin exists. They've known of its dramatic effect...uced in the tips of plant shoots and branches. The hormone travels downward toward the roots. It migrates into plant cell nuclei, where it is picked up by the ...

Measuring hormone cuts antibiotic use in half in pneumonia patients

Measuring a hormone in the blood can help doctors greatly reduce the n...n the study, pneumonia patients whose level of the hormone procalcitonin was measured during the course of their illness took antibiotics an average of 6 days,...

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