Tag: Alzheimer’s disease

Food for Thought: Weekly Wrap-Up

Frankfurter Allgemeine Sonntagszeitung (FAS) this week in a special section (not online yet) deals with prion diseases such as Kuru, Creutzfeldt-Jakob disease, BSE and scrapie and the history of the discovery that some CNS disorders are caused not by pathogens, such as bacteria or viruses, but by infectious proteins. In one of the articles, Volker Stollorz deals with the implication of the discovery. It led to the notion that CNS diseases can be caused by misfolding of proteins, and meanwhile  about 2 dozen neurological disorders are classified as “proteopathies”, among them Alzheimer’s disease and Parkinson’s disease. Stollorz features research that points to the possibility that proteopathies spread through the body by some sort of domino effect. In this case, it cannot be ruled out that they are contagious – which would have enormous consequences for medicine. To rule out the possibility that modern medicine contributes to the spread of neurodegenerative diseases, some researchers already call for sterilizing medical instruments with procedures that also deactivate proteins.

Ralph Diemann in Süddeutsche Zeitung this week introduces photovoltaic company Konarka, which is using the site and machinery of Polaroid company to manufacture sheets producing electric current. Using the old Polaroid instant film technology, the company is printing conductive molecules on extremely thin, light and flexible films that can be applied to common goods – sunshades, car bodies, window panes or even clothes. First products – daypacks and bags producing current to charge mobile phones, already have reached the market. Other companies – BASF, Thyssen-Krupp and Bischoff Glastechnik – will follow suit, Diemann writes. Disadvantages at present are a very low efficiency, a durability of a few years only and a high price.

The Economist this week reports on experiments of various research groups, which have turned mind-reading into reality. The results are still crude, but already, recording brain activity has proven to be an inroad into this area.

Belle Dumé in The New Scientist makes the case for green tea and red laser to treat Alzheimer’s disease. While epigallocatechin gallate (EGCG), an ingredient of green tea can reduce beta amyloid plaques in the brain, red laser light which penetrates tissue and even bone can facilitate uptake of EGCG by the brain and by brain cells. The results come from animal experiments.

Last not least, Robert McMillan in Wired reports about the symbiotic relationship between IT and manure. IT company Hewlett-Packard (HP) seriously is thinking about using cow dung to power future data centers. These centers produce a lot of heat which can be used to heat cow dung for the production of methane, which in turn can power the data center.

Food for Thought: Weekly Wrap-Up

Dieter Durand and Susanne Kutter in Wirtschaftswoche feature a disputation between Alzheimer-researcher Konrad Beyreuther and author Cornelia Stolze, who has written a book claiming Alzheimer’s disease does not exist as an exactly defined disease.

While Beyreuther maintains the disease is real and can be clinically separated from other forms of dementia, he concedes that current medications are useless and that diagnosis often is inadequate. Stolze in her book “Vergiss Alzheimer” (“Forget About Alzheimer’s”) states that patients with signs of dementia often are labeled as Alzheimer’s disease patients although they are not, that they receive useless medications, that the real causes of their respective dementias, such as diabetes, depression, stroke, or dehydration, are overlooked and not treated, and that medical doctors make money with unreliable early diagnostic tests. A review of the book is to follow soon – please regularly check the akampioneer.

Joachim Müller-Jung in Frankfurter Allgemeine Zeitung (FAZ) comments on a proposal by several US stem cell researchers in the “Cell Stem Cell” journal. The manifesto calls for establishing a market for human donor egg cells so that scientists can use these cells for cloning experiments. While the purpose is not cloning humans but generating pluripotent human stem cells, Müller-Jung warns that the push will once again put the “cloning humans” debate on the table – a discussion he thinks is needed like a hole in the head. He states there are plenty of experiments already demonstrating that sooner or later it will be possible to generate pluripotent human stem cells for regenerative medicine by reprogramming human body cells.

Martina Lenzen-Schulte, also in FAZ, features the first attempts to use the mirror neuron concept for clinical purposes, e.g. for the rehabilitation of stroke patients to support regain of movement control.

Hildegard Kaulen in FAZ reminds her readers that a substantial part of the research crowned by nobel prizes never received third-party funds. She expresses sympathy with the proposal put forward in “Nature” by Stanford University’s John Ioannidis to either allocate research grants by lottery, by dividing up the money so that each applicant receives the same amount, or simply by handing out money to outstanding scientists with the only specification to use it for research. He criticizes that it has never been investigated which method to allocate research grants is the best and that the current practice consumes too much valuable time that should be spent more creatively on research.

Die Welt reports in a feature by dpa on material scientists of the Technical University Dresden who use wood for pipes that are as strong and resilient as pipes made from concrete. Wood is cut to rectangular blocks, which are heated to 140°C and compressed. Subsequently, all air – which amounts to up to two third of the wood’s volume –  is removed. The resulting panels are then bonded and formed by applying steam. The team led by Peer Haller of the university’s Institute for Steel and Wood Construction calculates that a post carrying 50 tons of weight needs 155 kg of steel but only 28 kg of wood treated with the new procedure.

Katrin Blawat in Süddeutsche Zeitung (SZ) reports that Umckaloabo, an alcoholic extract of Pelargonium sidoides roots, is under investigation by Germany’s Federal Institute for Drugs and Medical Devices (BfArM). The medication, which is sold as OTC in Germany for the treatment of acute bronchitis (with annual sales of about € 40 million), is suspected to cause inflammation of the liver, with six cases reported in 2011.

The New York Times (NYT) this week deals in-depth with the recommendation of the United States Preventive Services Task Force that men no longer should have an annual prostate-specific antigen (PSA) test. Gardiner Harris interviewed the experts involved in reviewing PSA testing, citing Dr. Roger Chou, an associate professor of medicine at the University of Oregon, as saying “the idea that knowing you have a cancer isn’t always a good thing is a very difficult concept for many people.” Chou states that the vast majority of men who have prostate cancer will never be bothered by it. Urologists however view the issue differently, stating the task force chose to focus on the wrong studies and it was wrong to throw PSA testing away.

Last not least, in preparation of the coming common cold season, Ulrike Gebhard in Neue Zürcher Zeitung (NZZ) explains that men suffer from the common cold more often than women. Reason is – according to researchers from Belgian Gent University – that women often carry extra portions of genes from the toll-like receptor (TLR) gene family. As a result, they produce more of the so-called miRNA molecules that support the body in fending off viral infections. The downside of women’s more powerful immune system is increased susceptibility to autoimmune diseases and a more violent reaction to certain vaccines.

Company News: Probiodrug’s Hypothesis on Alzheimer’s Disease Onset Featured in German Radio

During the upcoming World Alzheimer Day, the German MDR radio will feature the efforts by German biotechnology company Probiodrug to develop novel strategies for the treatment of Alzheimer’s Disease (AD). MDR’s FIGARO am Vormittag morning magazine will introduce the company’s hypothesis on the onset of Alzheimer’s Disease (AD) and highlight the latest research results published by Probiodrug and co-workers from German and US research institutions in the recent  Journal of Neuroscience.

It is well known that the presence of so-called beta-amyloid (A beta) plaques in the brain is not necessarily correlated with the occurrence of AD. Probiodrug discovered that in AD patients, the core of the plaques is made form a certain variant of the A beta peptide which is more neurotoxic, less soluble and able to rapidly aggregate with modified and unmodified A beta. Further investigations revealed that this toxic variant is generated by an enzyme called QC (glutaminyl cyclase). QC is responsible for activating certain hormones and enzymes in the brain by modifying a certain chemical group in these molecules. If it starts acting on A beta, it produces the toxic variant. Probiodrug also has demonstrated in various experiments that it is possible to prevent the formation or spread of toxic A beta plaques by switching off the QC enzyme. The company therefore is developing drugs to inhibit the enzyme as a potential treatment strategy to either prevent the onset of AD or slow down the progression of the disease.

Company News: Neurodegeneration in Alzheimer’s Disease: The crucial role of QC

Probiodrug provides further insights into the onset of AD in The Journal of Neuroscience

Probiodrug AG (Probiodrug), a biotech company developing novel products for the treatment of neurodegenerative and inflammatory disorders, today announced the publication of data providing key insights into the onset and development of Alzheimer’s disease (AD) in the Journal of Neuroscience (http://redir.ec/jneurosci).

AD is characterized by deposition of amyloid-β (Aβ) plaques in the brain. However, quantitative relationship between plaque deposition and severity of cognitive decline in the affected individuals is still elusive. Often, elderly people carry a large amyloid burden without any signs of cognitive impairments, and many animal models of AD also develop the characteristic hallmarks, such as plaques, but do not demonstrate the cognitive defects and loss of neurons typical of the human disease.

Several years ago, Probiodrug developed the hypothesis that the missing link between Aβ load and prevalence of AD is a certain modification of Aβ, in which the Aβ molecule carries a pyroglutamate residue (pGlu) at its N-terminus. This pGlu-Aβ is neurotoxic and develops a strong tendency to aggregate and to seed aggregation of further pGlu-Aβ as well as unmodified Aβ. The modification of glutamic acid to a pGlu-residue is catalyzed by the so-called QC enzyme (glutaminyl cyclase).

In this week’s The Journal of Neuroscience* Probiodrug researchers (and their collaborators from Friedrich Alexander University, Erlangen, the German Center of Neurodegenerative Diseases, Magdeburg, the Leibniz Institute for Neurobiology, Magdeburg, the Paul Flechsig Institute for Brain Research, Leipzig, and the University of Tennessee, Knoxville/ USA) now describe the generation and characterization of a novel animal model that solely expresses N-truncated human Aβ, which in turn is modified by QC to pGlu-Aβ. As a result, these animals which express the toxic species 1000fold less than other models do with Aβ not only have the typical pathological changes, but also neuronal loss and cognitive impairments.

”We now have animal models that represent the full spectrum of pathological and behavioral changes in AD without overexpressing the Aβ peptides. In addition, we could once again clearly demonstrate that the activity of QC enzymes is starting the chain of events that ultimately leads to the debilitating disease, which already affects millions of people world-wide. The results in this study also demonstrate that lowering the QC-dependent formation of pGlu-Aβ reduces the amount of neurotoxic aggregations, and further strengthens the hypothesis that inhibition of QC is a promising new treatment strategy for AD” commented Hans Ulrich Demuth, CSO of Probiodrug.

*doi:10.1523/JNEUROSCI.2172-11.2011

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