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marți, 13 decembrie 2011

Brain Tumor Chemotherapy Resistance Prediction

Main Category: Cancer / Oncology
Also Included In: Neurology / Neuroscience;  Radiology / Nuclear Medicine
Article Date: 13 Dec 2011 - 1:00 PST

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Glioblastoma multiforme (GBM) is the most common and lethal of all human brain tumors that originate in the brain.

For most patients, treatment involves surgery followed by both radiation therapy and chemotherapy with temozolomide. However, many GBMs are resistant to the effects of temozolomide.

A team of researchers led by Sameer Agnihotri, at the University of Toronto, Toronto, has now determined that the protein APNG can contribute to GBM resistance to the effects of temozolomide. Importantly, high levels of expression of APNG in the nucleus of ressected tumor cells correlated with poorer overall survival compared with patients lacking APNG expression. Agnihotri, and colleagues therefore suggest that monitoring APNG levels could provide insight into whether or not a patient with GBM will respond to temozolomide, although this awaits confirmation in predictive and prospective studies.

TITLE: Alkylpurine-DNA-N-glycosylase confers resistance to temozolomide in xenograft models of glioblastoma multiforme and is associated with poor survival in patients

Article adapted by Medical News Today from original press release. Click 'references' tab above for source.
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luni, 12 decembrie 2011

New Paper Calls For Strong Steps To Tackle Antibiotic Resistance

Main Category: MRSA / Drug Resistance
Article Date: 12 Dec 2011 - 0:00 PST

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Shahriar Mobashery, a University of Notre Dame researcher, is one of the coauthors of a new paper by a group of the world's leading scientists in academia and industry that calls for strong steps to be taken to control the global crisis of antibiotic resistance in bacteria. The group issued a priority list of steps that need to be taken on a global scale to resolve the crisis. The paper is an outgrowth of a meeting the group held at the Banbury Conference Centre in Cold Spring Harbor, N.Y., to discuss the crisis and it appears in the journal Nature Reviews Microbiology.

The group notes that in Europe in 2007, the number of infections by multidrug-resistant bacteria was 400,000 and there were 25,000 attributable deaths.

In the United States alone, antibiotic-resistant infections are responsible for $20 billion per year in excess health care costs, $35 billion per year in societal costs and 8 million additional hospital stays per year.

The problem of resistance is compounded by the fact that we live in a global economy, resulting in a worldwide spread of antibiotic-resistant genes.

The Banbury group recommends that research priorities be established to control resistance. They point out that additional basic information about resistance is required to address the crisis. "Increasing lines of evidence identify the principal reservoirs of resistance genes to be bacteria that live in and on humans and animals, as well as those found in the environment (in soil, water and so on)," the paper notes. "However, there is insufficient information about the conditions and factors that lead to the mobilization, selection and movement of these bacteria into and between animal and human populations."

The report also calls for increased international funding to enable scientists to track new antibiotic-resistance threats worldwide, in a manner similar to how the World Health Organization and other agencies track influenza out breaks.

The paper points out that antibiotic resistance is life-threatening in the same sense as cancer, both in the number of cases and the likely outcome. It therefore calls for a public education campaign about bacteria and antibiotic resistance similar to those that have been mounted for cancer awareness.

The study also notes that in some parts of the world, population density, the uncontrolled use of antibiotics, a lack of both a clean water supply and proper treatment for sewage and industrial effluent create the conditions that disseminate and select resistant bacteria.

"Local governments must be encouraged and supported to invest in better sanitation infrastructure and tighter prescription regulations to control the rapid evolution of resistance," the scientists said. "This is a worldwide, multinational problem and must be treated as such." The group also notes that it is essential to develop a continuous supply of new antibiotics that are not affected by known or existing mechanisms of resistance. The economics of pharmaceutical drug development offer little incentive for companies to develop new antibiotics, since the drugs are used on an episodic, rather than continual, basis. New public-private partnerships must develop to overcome the economics barriers facing the development o new antibiotics.

The Banbury participants also call for better control of antibiotic use, repurposing of old antibiotics to battle resistance and new alternatives to antibiotics.

The group's paper concludes, "The cost of the undertaking that we propose will be infinitesimally small in comparison to the economic and human cost of doing nothing."

Article adapted by Medical News Today from original press release. Click 'references' tab above for source.
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vineri, 9 decembrie 2011

Sewage Treatment Plants May Contribute To Antibiotic Resistance Problem

Main Category: Infectious Diseases / Bacteria / Viruses
Also Included In: Water - Air Quality / Agriculture;  MRSA / Drug Resistance
Article Date: 09 Dec 2011 - 1:00 PST

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Water discharged into lakes and rivers from municipal sewage treatment plants may contain significant concentrations of the genes that make bacteria antibiotic-resistant. That's the conclusion of a new study on a sewage treatment plant on Lake Superior in the Duluth, Minn., harbor that appears in ACS' journal Environmental Science & Technology.

Timothy M. LaPara and colleagues explain that antibiotic-resistant bacteria - a major problem in medicine today - are abundant in the sewage that enters municipal wastewater treatment plants. Treatment is intended to kill the bacteria, and it removes many of the bacterial genes that cause antibiotic resistance. However, genes or bacteria may be released in effluent from the plant. In an effort to determine the importance of municipal sewage treatment plants as sources of antibiotic resistance genes, the scientists studied releases of those genes at the Duluth facility.

Although the Duluth facility uses some of the most advanced technology for cleaning wastewater - so-called tertiary treatment - the study identified it as an important source of antibiotic resistance genes. Sampling of water at 13 locations detected three genes, for instance, that make bacteria resistant to the tetracycline group of antibiotics, which are used to treat conditions ranging from acne to sexually transmitted diseases to anthrax and bubonic plague. LaPara's team says their research demonstrates that even the most high-tech sewage treatment plants may be significant sources of antibiotic resistance genes in waterways.

Article adapted by Medical News Today from original press release. Click 'references' tab above for source.
Visit our infectious diseases / bacteria / viruses section for the latest news on this subject. The authors acknowledge funding from the National Science Foundation and the Minnesota Environment and Natural Resources Trust Fund.
American Chemical Society Please use one of the following formats to cite this article in your essay, paper or report:

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9 Dec. 2011. APA

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View the original article here