Researchers at Rush have identified the underlying mechanism of calcium-triggered cardiac arrhythmias, or irregular heartbeats. The discovery, described in the Jan. 19 issue of Nature Medicine, has major implications for the development of molecularly designed drugs specifically targeted at this form of arrhythmia.
The study was led by Wayne Chen, PhD, professor of molecular biophysics and physiology at Rush and professor of physiology and biochemistry at the University of Calgary-Libin Institute. Michael Fill, PhD, professor of molecular biophysics and physiology at Rush, collaborated on the research.
Cardiac arrhythmias can cause dizziness and fainting, or in severe cases, sudden death. While many factors, including genetics, contribute to the development of arrhythmias, research has shown that a common cause of cardiac arrhythmias is calcium overload. Calcium overload disrupts the finely controlled electrical activity governing contraction of heart muscle.
Calcium is stored inside cardiac cells, much like skeletal muscle cells, in preparation for contraction. The protein responsible for release of calcium is known as the cardiac ryanodine receptor (RyR2), or the calcium release channel, which acts like a safety valve that prevents calcium overload.
Read the news release.
A newly-developed, “designer” dietary fiber with an added potential prebiotic effect may eliminate the side effects of current treatment for irritable bowel syndrome (IBS), which affects 10 to 20 percent of the population, disproportionately women.
The collaboration between a gastroenterologist at Rush and a carbohydrate chemist at Purdue University led to the development of the new product, a natural starch derived from a mixture of seaweed and starch in which the release of starch fiber in the gastrointestinal tract can be delayed, slowed and controlled to occur in the colon, rather than in the stomach and upper intestine.
“This new product prevents the discomfort and bloating associated with current fiber therapies, while getting our new fiber into the colon and specifically distal colon where traditional fiber products typically do not reach and where many diseases of colon-like cancers develop,” said Dr. Ece Mutlu, principal investigator the phase II trial that will begin at Rush in January 2014. “This can provide an effective treatment for IBS, decrease the risk of colon cancer and possibly inflammatory diseases like colitis,” she added. The study seeks 200 people who have been diagnosed with IBS and constipation.
In an earlier Phase I study with 60 patients suffering from constipation, the newly designed fiber was shown to be safe, better tolerated and with fewer side effects than currently available fiber treatments for constipation, and it had a positive effect on intestinal microbiota composition by promoting the growth of “healthy” bacteria in the colon.
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Dr. Lydia Usha, director of the Rush Inherited Susceptibility to Cancer (RISC) program at Rush, is currently investigating genetic causes of cancer in patients who tested negative for the BRCA1 and BRCA2 genetic mutations but still developed breast or ovarian cancer and have a known mutation in one of these genes in the family.
The results may help explain why patients who test negative for a genetic predisposition to cancer may still develop cancer. Usha is examining the idea that certain people have the familial BRCA mutation in some tissues, but not in their blood. She hypothesizes that these patients have had BRCA-positive chimeric cells in their body since birth, making these cells more susceptible to developing cancer. Usha and her team are recruiting patients and testing their cancer tissue for the familial mutation.
“This is important because we know that some drugs are more effective in treating patients who have breast and ovarian cancers with these specific mutations,” Usha said.
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Using germ-killing soap and ointment on all intensive care unit patients can reduce bloodstream infections by up to 44 percent and significantly reduce the presence of methicillin-resistant Staphylococcus aureus (MRSA) in ICUs, according study results published in today’s New England Journal of Medicine.
The REDUCE MRSA trial, funded by the Department of Health and Human Services, was conducted in two stages from 2009-2011. It tested three MRSA prevention strategies and found that using germ-killing soap and ointment on all ICU patients was more effective than other strategies.
“The strategy that proved to be most effective was perhaps the most straightforward: All patients were bathed daily with chlorhexidine antiseptic soap for the duration of their ICU stay and all received mupirocin antibiotic ointment applied in the nose for five days,” said Dr. Mary K. Hayden, associate professor of infectious diseases and pathology at Rush University Medical Center, and one of the co-authors of the study.
Read the entire news release.
Louis Kraus, MD
The Chicago region’s first comprehensive center serving patients from childhood into young adulthood with autism spectrum disorders has been established at Rush University Medical Center.
The Autism Assessment, Research, Treatment and Services Program is building assessment, treatment, residential care and research programs to serve families across the lifespan of an individual with autism. A gift from the Boler family’s foundation provided funding for the center to be established. The program will be integrated with the existing Autism Resource Center at Rush to provide families with long-term coordinated care, and a comprehensive clearinghouse of resources.
“Research has demonstrated the power of targeted interventions to improve educational performance, socialization, language skills and sensory integration issues in people with autism,” said Dr. Louis Kraus, chief of Child and Adolescent Psychiatry at Rush University Medical Center. “In Chicago, no single site offers this full range of services, creating financial and time-related burdens on families as well as limiting the degree of coordination and communication among care providers.”