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Osteoporosis could be caused by factors other than declining estrogen levels

New evidence in the April 21, 2006 Cell challenges the long-standing notion that declining estrogen levels alone lead to osteoporosis after women go through menopause. The researchers rather found that high levels of pituitary-derived follicle-stimulating hormone (FSH) cause bone loss in mice. The pituitary is a master gland found at the base of the brain.

26 Apr 2006

Cause and treatment for aggressive head and neck cancer may have been found

Researchers report that they have found a potential molecular cause for the aggressive growth and spread of human head and neck squamous cell carcinoma, a highly malignant form of cancer with a very high death rate.

26 Apr 2006

Study shows drugs work differently in the brains of men and women

A Johns Hopkins discovery could lead to tailored treatments for drug abuse and neurological diseases after providing what is believed to be the first evidence in people that amphetamines have a greater effect on men's brains than women's.

24 Apr 2006

Yale researchers show how smell works within the brain

Yale scientists have systematically plotted the responses of the entire Drosophila (fruit fly) olfactory system, providing the first multi-dimensional map of the range of odorants sensed and the regions of the brain that are stimulated.

23 Apr 2006

Penn researchers discover gene that creates "second skeleton" bone disorder

Researchers at the University of Pennsylvania School of Medicine have located the "skeleton key," a gene that, when damaged, causes the body's skeletal muscles and soft connective tissue to undergo a metamorphosis into bone, progressively locking joints in place and rendering movement impossible.

23 Apr 2006

Study reveals findings on how insulin-producing beta cells grow and function

A new Joslin Diabetes Center-led study has shown conclusively that two receptors in the insulin-producing beta cell do not affect developmental growth, refuting a long-held hypothesis in diabetes research.

23 Apr 2006

A TAS1R receptor-based explanation of sweet water taste

A scientific paradox linking artificial sweeteners such as saccharin with a sensory experience in which plain water takes on a sweet taste has guided researchers to an increased understanding of how humans detect sweet taste.

23 Apr 2006

New methods for revealing nerve-muscle activity in live animals

Picking up a pencil, running a marathon, even the simple act of breathing - every time we move a muscle we depend on a series of finely-tuned interactions at the junction of nerve fiber and muscle cell.

20 Apr 2006

Researchers clarify the mechanism by which drugs like Celebrex and Vioxx cause heart problems

Researchers at the University of Pennsylvania School of Medicine have clarified the mechanism by which drugs like Celebrex and Vioxx cause heart problems, in multiple animal models.

18 Apr 2006

Chimpanzees and humans have gene variant, for different reasons

Gene variants determine which humans and which chimpanzees can taste bitter substances. For humans, this taste sensitivity may influence nutritional choices and ultimately their health, as well as behaviors, such as smoking.

18 Apr 2006

Hap1 protein could lead to future drug targets for eating disorders

Researchers have discovered how the protein Hap1, which is abundant in the brain's hypothalamus, serves as the link between circulating insulin in the blood and the neural circuitry that controls feeding behavior in mice.

16 Apr 2006

Researchers suggest drug could block metastasis or reduce pain for bone cancer patients

An international research team has identified what may be a critical molecule in the ability of tumours to metastasize -- or spread -- into bone.

13 Apr 2006

A hormone receptor with regulatory roles in food intake, fear response, and cardiovascular function may also be involved in breast cancer

The UC research team, led by Hassane Amlal, PhD, and Sulaiman Sheriff, PhD, report their laboratory findings on the hormone, neuropeptide Y, and its receptor in the April edition of the journal Cancer Research.

13 Apr 2006

Advances in chemotherapy significantly reduce risk of disease recurrence in breast cancer patients

Recent advances in chemotherapy have significantly reduced the risk of disease recurrence and death in breast cancer patients whose tumors are not hormone sensitive, according to a study by researchers at Dana-Farber Cancer Institute and 10 other institutions.

13 Apr 2006

Benefit of chemotherapy in breast cancer depends on estrogen status of tumors

When it comes to chemotherapy treatment for women whose breast cancer has spread to their lymph nodes, the estrogen status of their tumors matters, says a team of researchers in the Journal of the American Medical Association.

11 Apr 2006

Targeted mutations in mice uncover two key molecular events linked to learning

Johns Hopkins researchers have used mouse mutants to define critical steps involved in learning basic motor skills. The study focuses on the behavior of two proteins and the specific steps they take to control a neuron's ability to learn by adapting to signals from other nerve cells.

11 Apr 2006

Scientists reconstruct Darwinian evolution to explain 'irreducible complexity'

Using new techniques for resurrecting ancient genes, scientists have for the first time reconstructed the Darwinian evolution of an apparently "irreducibly complex" molecular system.

11 Apr 2006

Researchers identify critical human cell surface molecule involved in infection by Kaposi's sarcoma herpesvirus

Researchers at the National Institute of Allergy and Infectious Disease (NIAID) have identified a critical human cell surface molecule involved in infection by Kaposi's sarcoma herpesvirus (KSHV), the virus that causes Kaposi's sarcoma and certain forms of lymphoma.

11 Apr 2006

Scientists use corrective gene to block a protein in the kidneys that triggers high blood pressure

Nearly one-third of American adults have high blood pressure, a major cause of heart attacks, strokes and kidney failure. But a new technique tested at the University of Florida could prove to be a long-term way to treat the disorder in humans, researchers say.

11 Apr 2006

Genetic variants in estrogen-related genes linked to Parkinson's disease in women

Mayo Clinic researchers have discovered a possible connection between increased risk for Parkinson's disease and variants in three genes that control estrogen production and activity in the body.

11 Apr 2006