Archive for March 27th, 2008

Obesity Increases The Risk of Dementia

March 27th, 2008 | Category: Uncategorized

Individuals, who suffer from obesity or are overweight with large bellies have double or make threefold the risk of dementia.

People in their 40s with larger stomachs have a higher risk for dementia at what time they reach their 70s, according to a study published in the March 26, 2008, online consequence of Neurology, the medical journal of the American Academy of Neurology.

Obesity and Dementia Link

Previous studies have looked at central obesity (as determined by waist circumference) and body mass index in the somewhat old and its link to dementia risk. In addition, previous studies have shown that a large abdomen — in midlife — increases the risk of diabetes, visitation, and coronary heart disease. This is the first time researchers acquire demonstrated a longitudinal association between midlife belly fat and the risk of idiocy.

Capturing abdominal obesity in midlife may be a much better indicator of the long-term metabolic dysregulation that leads to dementia risk, said study author Rachel Whitmer, Ph.D., a research scientist at the Kaiser Permanente Division of Research in Oakland, Calif.  Measuring abdomen size in older age people may not be as good an indicator inasmuch as as people age they tend to naturally lose muscle and bone mass and gain belly sizing, she explained.

“Considering that 50 percent of adults in this country have abdominal obesity, this is a disturbing finding. It is well known that being overweight in midlife and over increases dare to undertake factors for disease. However, where one carries the weight –especially in midlife — appears to be an important predictor for dementia risk,” she said.

“Autopsies be favored with shown that changes in the brain associated with Alzheimer’s ailment may start in young to middle adulthood, and another study showed that high abdominal fat in elderly adults was tied to greater brain atrophy. These findings imply that the dangerous effects of abdominal obesity on the brain may start long before the signs of dementia appear.” She explained that additional research needs to be completed to determine the underlying mechanisms that link abdominal obesity in midlife to dementia risk.

Researchers studied 6,583 people ages 40 to 45 in Northern California who had their abdominal density measured. Belly fat was measured by using a caliper to determine the distance from the back to the upper abdomen, midway between the top of the pelvis and the bottom of the ribs. bulge density is highly correlated with visceral fat tissue, the fat tissue that is wrapped around the organs, according to the researchers.  An average of 36 years later, 16 percent of the participants had been diagnosed with dementia.

The study found that those who were overweight and had a large belly were 2.3 times more likely to develop dementia than people with a according to rule weight and belly size. People who were both obese and had a large belly were 3.6 times more likely to develop dementia than those of normal weight and belly size. Those who were overweight or obese but did not have a vast abdomen had an 80 percent increased risk of dementia.

Having a large abdomen increased the risk of dementia regardless of whether the participants were of normal weight overall, overweight, or obese, and regardless of existing health conditions, including diabetes, stroke and cardiovascular disease.

Non-whites, smokers, people with high blood influence, high cholesterol or diabetes, and those by less than a high school level of education were more to be expected to have abdominal obesity.

It is possible that the association of the abdominal obesity and dementia is not driven by the abdominal obesity, but rather by a complex set of health-related behaviors, for which abdominal fleshiness is but one part.

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New Book: Fighting Terror Online

March 27th, 2008 | Category: Uncategorized

Inspired by recent threats of terrorism, Professor Martin Golumbic, Director of the Caesarea Rothschild Institute for Interdisciplinary Applications of Computer Science at the University of Haifa wrote this new book examining the future of online terrorism. As Professor Golumbic explains, online terrorism is the use of novel technology to elicit fear and panic in society. Fighting Terror Online focuses on how different societies react to this new form of terrorism and the ethics behind these responses. In Fighting Terror Online Golumbic asks the burning debate, “How do we balance security needs and individual rights?”

Fighting Terror Online not only justifies the digital theater as the battle ground in the war against terror, but recognizes specific threats in relation to security and the environment. Golumbic and his research team apportion by pressing issues of government ethics and add penetrating vision to issues dealing with, how far is too far? With precise regards to public privacy issues and when does national preservation intrude on individual rights? Fighting Terror Online recognizes the internet as the new battlefront of terror and with the aid of specific examples in Israel and abroad offers suggestions for future legislation and policy within the global society.

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Article adapted by Medical News Today from original press release.
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Source: Laurie Groner
University of Haifa

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‘Mutant’ Proteins Could Lead To New Treatment For Heart Disease

March 27th, 2008 | Category: Uncategorized

Heart hurt due to blocked arteries remains the leading cause of disease and death in the Western world, but a Florida State University College of Medicine researcher is helping to open new pathways nearly treating the problem.

Michael Blaber, a professor in the office of biomedical sciences, is researching mutant forms of a human protein that have been shown to help the like a man body grow new blood vessels to restore blood flow in damaged areas of the heart.

Working with a $264,000, three-year grant from the American Heart Association, Blaber hopes to provide data that will enable the use of the mutant proteins in new treatment methods previously unavailable for patients with advanced “no option” heart disease.

“This research offers the potential to treat people who currently are being sent hearthstone to die,” Blaber said. “We’ve tested a group of mutants in the laboratory through unusual properties of increased firmness and activities — cheerful properties. In some cases it was unexpected, but the results are very promising.”

Obstructed blood vessels and clogged or blocked arteries typically are treated through angioplasty, the mechanical widening of a vessel, or bypass surgery. Some patients, however, have numerous small blockages that cannot be treated through traditional approaches. In most cases, they are sent home with a predicted life expectancy that, no matter how it’s phrased, sounds like a death sentence.

A new approach to the problem called curative coronary angiogenesis is creating hope from one side the injection of human fibroblast growth factor protein into foppish areas. Improvements with the procedure may arise from the use of mutant forms through increased stability.

Blaber and his research team are creating artificial “mutant” proteins in their College of Medicine laboratory that mimic the human proteins used in angiogenic therapy, and with enhanced stability properties. So far, the mutant proteins engineered at the College of Medicine have exhibited potency in stimulating cell growth while simultaneously maintaining greater fixedness under stipulations common to angiogenic therapy.

The drudge has enormous potential commercial applications and already has drawn the attention of private companies interested in the results Blaber’s lab has achieved and the intellectual properties his studies are generating.

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Article adapted through Medical News Today from original press absolution.
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Source: Doug Carlson
Florida State University

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Metabolic Regulator Has Hand In Controlling Vessel Growth

March 27th, 2008 | Category: Uncategorized

One of the most intensive pursuits in medical science is the hunt for ways to control the formation of new blood vessels. This process of angiogenesis has been called the common denominator of disease because of its influence on many different conditions, from cancer to heart disease to tissue injury and degeneration. Millions of patients stand to benefit from angiogenic therapies.

But building new vessels or tearing them down is not a simple process. There are at least 50 known factors in the body that govern vessel formation, and harnessing them can have being tricky. Several therapies targeting a single though central factor be in actual possession of failed, for example, because the new vessels remain leaky and immature. Researchers are now looking for targets that coordinate multiple angiogenic factors.

That is why when Bruce Spiegelman, HMS professor of cell biology at the Dana–Farber Cancer Institute, and his assistant Zoltan Arany, HMS instructor in medicine at Beth Israel Deaconess Medical Center, recognized that a gene known for regulating metabolism also behaves like the conductor of a glorious angiogenic orchestra, they were pleasantly surprised.

This gene, PGC-1 alpha, “turns on a perfect program of angiogenesis,” said Spiegelman. “It’s one of nature’s ways of turning on angiogenesis. It puts things in the right place and in the right balance.”

The researchers are quick to point out that another angiogenic orchestral propagator of sorts, hypoxia-inducible factor (HIF), also exists and is well understood. What they have found in PGC-1 alpha is a second, completely independent pathway to new blood vessel growth. They describe their making known in the Feb. 21 Nature.

To build mature vessels, “we need to recapitulate what goes on in the body, to find orchestrators that bring in different molecules at different times. PGC-1 alpha is definitely one of these,” said Rakesh Jain, the A. Werk Cook professor of radiation oncology (tumor biology) at Massachusetts General Hospital. The discovery, he added, “opens up many doors” because it makes a corpuscular connection between metabolism and angiogenesis, two fundamental and interrelated biological processes with wide influence.

Expanding Regulatory Roles

Spiegelman discovered PGC-1 alpha 10 years ago and identified it as a key regulator of metabolic processes such as energy production and respiration. He and HMS professor of cell biology Alfred Goldberg later uncovered its role in protecting against muscle atrophy. This most recent study began when Spiegelman and Arany decided to explore the gene’s role in ischemia, resulting which time tissue is deprived of oxygen and nutrients. The condition can occur, instead of example, when a blocked artery cuts off the blood supply to an organ or limb.

As a cardiologist, Arany approached this study with heart attacks in notice. In heart disease, there is “no worse metabolic disaster than ischemia,” which can lead to heart attack, he said. “So what happens to this big metabolic regulator”—PGC-1 alpha—“during a big metabolic disaster?”

In their first experiments, they deprived cultured myotubes of oxygen and nutrients for several hours. Genetic screening revealed that PGC-1 alpha pervasive feeling levels soared 10-fold in these cells and remained elevated until nutrients were restored. They observed similar results in every cell line they assayed.

Seeing PGC-1 alpha respond to hypoxia in a way similar to the other angiogenic regulator HIF tipped them off that PGC-1 alpha might play a role in angiogenesis. “We were fishing in the in accordance with duty waters,” said Spiegelman of their serendipitous discovery. “We just weren’t looking for this particular fish.”

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Study Of Coping Methods Utilised Disgusting Videos

March 27th, 2008 | Category: Uncategorized

“Control yourself!”

Most of us haven’t heard that admonition since our last childhood tantrum. Nonetheless, it’s something we often tell ourselves, consciously or not, as we deal with life’s daily ups and downs. The ability to regulate one’s emotions is critical to successfully interacting with others. How we go about achieving that self-control has an equally important effect on our own well-being.

Now, researchers at Stanford have conducted the first-ever brain imaging study that directly contrasts two different techniques for emotion regulation. Functional magnetic resonance imaging (fMRI) was used to observe neural activity in people’s reason as they employed each of the two methods in coping with one of the most visceral of human emotions: disgust.

The researchers found that season one method, cognitive reappraisal, reduced the intensity of negative emotions the participants experienced when exposed to videos of disgusting images, the other, expressive suppression, actually increased it.

Philippe Goldin, a Stanford research associate in psychology and the lead creator of a paper describing the research in the March 15 issue of Biological Psychiatry, said that the value of the findings lies in “well-informed what are the different choices that I have in working with my emotions, and what are the different types of impact and issue, both internally and interpersonally, for each of these strategies.”

“Cognitive reappraisal is like to one of the skills we teach in cognitive-behavioral therapy,” Goldin said. “It’s using thinking strategies to modulate emotional reactivity by changing the meaning of something.” For example, whether or not you were watching a doctor stitch up a harm in someone’s limb, rather than just being horrified by all the blood, you might instead focus on the fact that the patient was being helped and would recover.

The other technique, expressive suppression, does not involve rethinking what you are experiencing. Instead, you foolishly suppress displaying any outward signs of what you are feeling; you grit your teeth and bear it.

Both reappraisal and suppression are commonly used to regulate emotions in everyday life.

The participants in the study were taught both techniques. During the experiment they would lie down in an MRI scanner, which depicted the neural activity in their brains while they viewed various 15-second video clips on a screen 6 inches from their face. A camera poised next to the video screen recorded their facial expression, capturing their every twitch and grimace. Participants also rated how they felt immediately after viewing each clip.

The researchers played forty 15-second video clips. Ten were of neutral images, such as landscapes and nature scenes, and 30 were “disgust-inducing”-scenes of “surgical procedures, vomiting and animal slaughter,” said James Gross, associate professor of psychology and senior author of the paper. “It’s tolerably awful stuff.” But, he emphasized, necessary.

“In order to understand which happens when people control intense emotions in everyday life,” Gross said, “we needed to induce potent emotions in the scanner so that we could see what parts of the brain are activated both by the emotion itself and by the efforts to regulate that emotion.”

The appearance of a lone patient in a medical laboratory, lying stock still on a table poised in a narrow funnel end the center of a huge cube of a machine, smooth-sided and whitely sterile, with head strong held in place as disgusting videos unfold on a screen 6 inches from her eyeballs, may seem a little reminiscent of the reprogramming scenes in A Clockwork Orange. But the researchers actually took famed care to avoid traumatizing anyone.

They screened their test subjects to keep the pool to those who would not be overwhelmed by dint of. the disgusting imagery (and excluded those who claimed they would be emotionally unmoved by it). Participants were free to exit the scrutinize at any time.

During each run, an instruction would briefly appear on the monitor prior to each video, telling the volunteers whether to rethink the meaning of what they were seeing; to suppress their facial look but not their feelings; or to re-enact naturally.

The fMRI images revealed that regardless of the strategy employed, two areas of the brain that are associated with emotional reactivity-the amygdala and the insula-lit up. But the degree of neural activity in each of the two regions, and the timing of it, were markedly different depending on whether cognitive reappraisal or expressive suppression was used.

By the end of each 15-second video, cognitive reappraisal, the reinterpretation strategy, led to reduced negative emotion as measured by subjects’ facial expressions, by fMRI images of neural excitation and by the participants’ self-report of how they felt. The technique affected the participants’ feelings relatively quickly.

Cognitive reappraisal “comes on early and in that case you kind of ride the wave of having implemented that strategy,” Goldin said.

That was not the case with facial expression suppression.

“Keeping your face still while watching these disgusting film clips actually resulted in an increase in neural activity in the amygdala and insula,” Goldin said. “During the 15-second film clip, the emotional reactivity is increasing and billowing while you’re attention the film clip, and the time when it becomes hardest to implement the ‘keep your face still’ instruction, the suppression, is at the end of each clip when the emotional intensity is really increasing.”

In scanty, only reappraisal was effective at decreasing subjects’ physiological responses, and suppression actually led to increased stress levels.

“These two forms of regulation work quite differently,” Gross said. “Early forms of regulation, such as reappraisal, effectively shut down the emotion at relatively little cost.” As for suppression, he said, “Although you can look cool as a cucumber, you actually get physiologically even more activated than you would accept been if you had correct let the emotion play itself out.”

Both Gross and Goldin emphasized that although rethinking the meaning of a part is a better strategy in many situations, it is not always best.

“If a person is in an injurious consanguinity and uses reappraisal to justify the behavior of the person who is hurting him or her, that could lead them to support in that dangerous situation far too long,” Gross said. “Similarly, suppression is often crucial in, for example, any interaction with each angry superior or boss at work. One simply doesn’t have time to think or reappraise the situation differently and so undivided might, for the good of one’s do job-work, in that moment, choose to suppress such that the boss doesn’t see which you really think of him or her.”

For this study, every part of the participants were women, because, as Goldin said, “In general women tend to demonstrate greater emotional reactivity compared to men.” But future work will include both women and men as participants, he said.

This most recent study is part of an ongoing effort by Gross’s lab to develop a better understanding-and eventually better therapies-for a host of disorders that involve poor control of emotion, from communicative anxiety to post-traumatic stress disorder.

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Article adapted by Medical News Today from original press release.
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Gross’s lab already has several studies in a state of being liable to way for which they are actively recruiting volunteers. For these studies, the lab needs adults with communicative anxiety disorder who are not agitation any medications that influence psychological functioning or blood flow, and who are willing to participate in functional neuro-imaging. People interested in more information about volunteering should visit [0]http://caan.stanford.edu/current_research.html.

Other co-authors of the bank-notes are Kateri McRae, a postdoctoral scholar in psychology, and Wiveka Ramel, postdoctoral scholar in psychiatry and behavioral sciences.

Source: Louis Bergeron
Stanford University

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