New research shows that all not mammals are created equal. In fact, this work shows that the animals most commonly used by scientists to study mammalian genetics -- mice -- develop unusually quickly and may not always be representative of embryonic development in other mammals. The study, published by Cell Press in the February 14 issue of the journal Developmental Cell, identifies significant differences in the timing of cell fate commitment during mouse and cattle embryonic development and raises important strategic implications for the generation of embryonic stem cells. The ...

After analyzing data on 2,155 private contractors, diplomats and other civilians supporting war efforts in Iraq and Afghanistan who were medically evacuated out of combat zones, researchers have found they are more likely to be evacuated for noncombat-related injuries, but more likely to return to work in-country after treatment for these conditions. Still, the findings of the Johns Hopkins-led research team, published online in CMAJ, the journal of the Canadian Medical Association, note that 75 percent of the nonmilitary group medically evacuated from the war zones to ...

BOSTON – February 14, 2011 – Once people develop type 2 diabetes, high blood glucose levels alter their metabolism so much that it becomes difficult to sift through all the clues to find what might enable the disease. "To identify factors that play a primary role in disease susceptibility, we want to investigate people before they get to that point," says Mary-Elizabeth Patti, M.D. of Joslin Diabetes Center. By examining people across the spectrum of diabetes—from healthy to the full-blown disease—scientists in her lab have found a molecular pathway that offers novel targets ...

The newly approved drug dabigatran is an alternative to warfarin to help prevent dangerous blood clots in patients with atrial fibrillation, according to updated guidelines from the American College of Cardiology, American Heart Association and the Heart Rhythm Society. The "Focused Update" — published in Circulation: Journal of the American Heart Association, Journal of the American College of Cardiology and HeartRhythm Journal — specifically updates the section on emerging antithrombotic agents in atrial fibrillation treatment guidelines released by the three organizations ...

Among women with breast cancer, approximately 25% have a subtype that is characterized by high levels of expression of the protein HER2. HER2-positive breast cancer tends to be more aggressive than other breast cancer subtypes. Increased molecular understanding of why HER2-positive breast cancer is so aggressive could aid in the development of new therapeutics. By studying mouse models, a team of researchers, led by Lewis Chodosh, at the University of Pennsylvania School of Medicine, Philadelphia, has now identified a key role for the protein Hunk in the formation of tumors ...

Most, if not all, solid tumors contain regions that are not well oxygenated. Tumor cells in these regions, which are known as hypoxic regions, are usually resistant to the death-inducing effects of chemotherapeutics. But now, Caroline Dive and colleagues, at Manchester University, United Kingdom, have identified a compound (ABT-737) that induces human cancer cells exposed to hypoxic conditions in vitro to undergo a form of cell death known as apoptosis. In addition, cells in hypoxic regions of human tumors xenografted in mice were susceptible to ABT-737–induced apoptotic ...

EDITOR'S PICK: A hunk of a target for treating breast cancer Among women with breast cancer, approximately 25% have a subtype that is characterized by high levels of expression of the protein HER2. HER2-positive breast cancer tends to be more aggressive than other breast cancer subtypes. Increased molecular understanding of why HER2-positive breast cancer is so aggressive could aid in the development of new therapeutics. By studying mouse models, a team of researchers, led by Lewis Chodosh, at the University of Pennsylvania School of Medicine, Philadelphia, has now identified ...

This release is available in French. VIDEO: A microsample is taken from the van Gogh painting "Bank of river Seine " on display at the van Gogh Museum in Amsterdam (Netherlands), and then analyzed at the X-rays microscope... Click here for more information. Scientists have identified a complex chemical reaction responsible for the degradation of two paintings by Vincent ...

A study by Mount Sinai School of Medicine finds that Medicare costs at the end of life are influenced more by patient characteristics, such as ability to function, the severity of the illness, and family support than by regional factors, such as the number of hospital beds available. The study will be published February 15 in The Annals of Internal Medicine. "These new findings show that the reasons for wide variation in Medicare costs across the United States are much more complicated than previously thought," said lead author Amy Kelley, MD, Assistant Professor in ...

Neurobiologists at UC San Diego have discovered new ways by which nerves are guided to grow in highly directed ways to wire the brain during embryonic development. Their finding, detailed in a paper in the February 15 issue of the journal Developmental Cell, provides a critical piece of understanding to the longstanding puzzle of how the human brain wires itself into the complex networks that underlie our behavior. The discovery concerns the movements of a highly sensitive and motile structure at the tips of growing nerves called a growth cone. For more than a century, ...

BOSTON – Over the last several decades, the prophylactic use of acid-suppressive medications to help prevent gastrointestinal bleeding (GI) in hospitalized patients has increased significantly, with some studies estimating that as many as 40 to 70 percent of all medical inpatients are given these drugs at some point during their hospitalization. But, for patients who are not critically ill, the actual incidence of GI bleeding has not been well investigated. Now, a study led by researchers at Beth Israel Deaconess Medical Center (BIDMC) and reported in today's on-line ...

According to Dr Annette Baudisch of the Max Planck Institute for Demographic Research in Rostock, Germany, current methods of comparing patterns of ageing are limited because they confound two different elements of ageing – pace and shape. "Some organisms live a short time, others live a long time. This is the pace of ageing. Short-lived species have a fast pace of ageing, and long-lived species have a slow pace of ageing. Pace describes how quickly the clock of life ticks away. For humans it ticks slowly, for small songbirds like the robin it ticks very fast," explains ...

Lavender oil could be used to combat the increasing incidence of antifungal-resistant infections, according to a study published in the Journal of Medical Microbiology. The essential oil shows a potent antifungal effect against strains of fungi responsible for common skin and nail infections. Scientists from the University of Coimbra in Portugal distilled lavender oil from the Lavandula viridis L'Hér shrub that grows in southern Portugal. The oil was tested against a range of pathogenic fungi and was found to be lethal to a range of skin-pathogenic strains, known as dermatophytes, ...

Most medical devices recently recalled by the Food and Drug Administration because of very serious risks were initially approved through an expedited process or were exempt from regulatory review, according to a report posted online today that will be published in the June 14 print issue of Archives of Internal Medicine, one of the JAMA/Archives journals. "Unlike prescription drugs, medical devices are reviewed by the U.S. Food and Drug Administration (FDA) using two alternative regulatory standards: (1) premarket approval, which requires clinical testing and inspections; ...

Obesity is a killer in its own right, irrespective of other biological or social risk factors traditionally associated with coronary heart disease, suggests research published online in Heart. Increasing weight is associated with a higher prevalence of known risk factors for coronary artery disease, such as diabetes, high blood pressure and cholesterol. And it has been assumed that these have been responsible for the increased risk of heart disease seen in obesity, say the authors. The research team tracked the health of more than 6,000 middle aged men with high cholesterol, ...

Portable pedal machines could help counter the harmful effects of prolonged periods spent at a desk or workstation among an increasingly sedentary workforce, suggests a small study published online in the British Journal of Sports Medicine. The researchers base their findings on 18 full time employees who were given a pedal exercise machine for four weeks, specifically designed to be used while seated at a desk in the workplace. The mini exercise bike comprised a set of pedals that can be set up in front of most standard office chairs for use while seated, and which ...

Dietary fiber may be associated with a reduced risk of death from cardiovascular, infectious and respiratory diseases, as well as a reduced risk of death from any cause over a nine-year period, according to a report posted online today that will be published in the June 14 print issue of Archives of Internal Medicine, one of the JAMA/Archives journals. Fiber, the edible part of plants that resist digestion, has been hypothesized to lower risks of heart disease, some cancers, diabetes and obesity, according to background information in the article. It is known to assist ...

Automatically referring patients with heart disease to cardiac rehabilitation—when followed by a discussion between patient and clinician—was associated with an increased rate at which patients use this beneficial service, according to a report in the February 14 issue of Archives of Internal Medicine, one of the JAMA/Archives journals. "Cardiovascular disease remains the leading cause of mortality worldwide, and this is chiefly attributable to modifiable risk factors such as hypertension, dyslipidemia, obesity, smoking, unhealthy diet and a sedentary lifestyle," the ...

Older adults with hearing loss appear more likely to develop dementia, and their risk increases as hearing loss becomes more severe, according to a report in the February issue of Archives of Neurology, one of the JAMA/Archives journals. By the year 2050, an estimated 100 million people or nearly one in 85 individuals worldwide will be affected by dementia, according to background information in the article. Interventions that could delay the onset of dementia by even one year could lead to a more than 10 percent decrease in the prevalence of dementia in 2050, the authors ...

Cigarette smoking may be associated with an increased risk of developing the muscle-wasting disease amyotrophic lateral sclerosis (ALS), according to a report in the February issue of Archives of Neurology, one of the JAMA/Archives journals. "Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disorder of motor neurons affecting more than 5,500 newly diagnosed patients every year in the United States," according to background information in the article. "There is no cure for ALS, and the few available treatments have limited efficacy. About 90 percent of ALS cases ...

Individuals who have higher blood glucose levels and poorer control of those levels over time appear more likely to develop eye-related complications 10 years later, according to a report in the February issue of Archives of Ophthalmology, one of the JAMA/Archives journals. The high blood glucose levels accompanying diabetes are known to be associated with microvascular complications, including the eye condition retinopathy, according to background information in the article. "However, some controversy concerns the actual value of this glycemic threshold for identifying ...

Obesity may be associated with higher eye pressure and a decreased risk of open-angle glaucoma in women but not men, according to a report posted online today that will appear in the May issue of Archives of Ophthalmology, one of the JAMA/Archives journals. "Open-angle glaucoma is a chronic eye disease characterized by glaucomatous optic neuropathy and corresponding glaucomatous visual field loss," the authors write as background information in the article. Previous research has identified several risk factors for open-angle glaucoma, including intraocular pressure (pressure ...

For the last several years, neurologists have been probing a connection between Parkinson's disease and problems with mitochondria, the miniature power plants of the cell. Toxins that mimic Parkinson's effects act specifically to poison mitochondria, and mitochondria appear to be damaged in the brain cells that are endangered in the disease. But one unresolved question has been: are mitochondria simply the vulnerable "canaries in the coal mine" or is their deterioration a key step on the way to neurodegeneration? Now researchers at Emory University School of Medicine ...

Two scientific publications report on improved methods for determining the amounts of flavanol antioxidants in cocoa and chocolate. The research, sponsored by The Hershey Center for Health and Nutrition, was a collaboration between scientists at The Hershey Company and other scientific laboratories. Scientists at Planta Analytica (Danbury, CT) isolated and separated cocoa flavanol antioxidants on a large scale. The Hershey scientists and collaborating scientists at the Pennsylvania State University-M.S. Hershey Medical Center (Hershey, PA) teamed up to determine the ...

(PORTLAND, Ore.) February 14, 2011 — A commonly prescribed osteoporosis drug is associated with a slightly elevated risk of developing the rare, but serious condition, osteonecrosis of the jaw; nonetheless the risk remains extremely low. These findings are published online in the Journal of Dental Research, the official journal of the International and American Associations for Dental Research. Although the findings are provocative, study authors say they should be carefully considered against the large benefit of these drugs to prevent and treat osteoporosis. The study ...