After an egg has been fertilized, it divides repeatedly to give rise to every cell in the human body — from the patrolling immune cell to the pulsing neuron. Each functionally distinct generation of cells subsequently differentiates itself from its predecessors in the developing embryo by expressing only a selection of its full complement of genes, while actively suppressing others…
In the earliest stages, embryo cells have the potential to develop into any type of cell, a state called totipotency. Later, this potency becomes restricted through a process called differentiation…
Now, researchers at Washington University School of Medicine in St. Louis have found a way the body can remove injured axons, identifying a potential target for new drugs that could prevent the inappropriate loss of axons and maintain nerve function. "Treating axonal degeneration could potentially help a lot of patients because there are so many diseases and conditions where axons are inappropriately lost," says Aaron DiAntonio, MD, PhD, professor of developmental biology. "While this would not be a cure for any of them, the hope is that we could slow the progression of a whole range of diseases by keeping axons healthy." DiAntonio is senior author of the study that appears online May 9 in the journal Cell Reports. …
After an egg has been fertilized, it divides repeatedly to give rise to every cell in the human body — from the patrolling immune cell to the pulsing neuron. …
That was back in the 1990s. Today, TNF-alpha is a prime example of how to safely and effectively deliver toxic substances to cancer cells through the use of nanotechnology. …
"[H pylori] is the major cause of gastritis (80 percent) and gastroduodenal ulcer disease (15 percent-20 percent) and the only bacterial pathogen believed to cause cancer," according to background information in the article. "H pylori prevalence is as high as 90 percent in some developing countries but 10 percent of a given population is never colonized, regardless of exposure. Genetic factors are hypothesized to confer H pylori susceptibility." Julia Mayerle, M.D., of University Medicine Greifswald, Greifswald, Germany, and colleagues conducted a study to identify genetic loci associated with H pylori seroprevalence…
The protein, called TR4 (testicular orphan nuclear receptor 4), is one of the human body’s 48 nuclear receptors, a class of proteins found in cells that are responsible for sensing hormones and, in response, regulating the expression of specific genes. Using a genome scan, the Salk team discovered that TR4 regulates a gene that produces adrenocorticotropic hormone (ACTH), which is overproduced by pituitary tumors in Cushing’s disease (CD). …
Researchers have shown that when our skin is exposed to the sun’s rays, a compound is released in our blood vessels that helps lower blood pressure. The findings suggest that exposure to sunlight improves health overall, because the benefits of reducing blood pressure far outweigh the risk of developing skin cancer. …
This update was published in the current issue of the American Journal of Medicine by Hennekens and James E. Dalen, M.D., M.P.H., dean emeritus, University of Arizona College of Medicine and executive director of the Weil Foundation. In a commentary published in Clinical Investigation, Hennekens and David J…
The research, which was led by Yanming Wang, a Penn State University associate professor of biochemistry and molecular biology, and Denisa Wagner, senior author with decades of research on thrombosis at the Boston Children’s Hospital and the Harvard University Medical School, will be published in in the Online Early Edition of the journal Proceedings of the National Academy of Sciences during the week ending 10 May 2013. The team’s new findings are an extension of previous research by Wang and other scientists. In earlier studies, Wang and his colleagues had revealed that a gene in mice called Pad4 (peptidylarginine deiminase 4) produces an enzyme that plays an important role in protecting the body from infection. The researchers discovered that cells with a functioning PAD4 enzyme are able to build around themselves a protective, bacteria-killing web that is dubbed a NET (neutrophil extracellular trap)…