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Rolofylline Did Not Demonstrate Efficacy For Acute Heart Failure In Clinical Trial
Merck & Co., Inc. said that preliminary results for the pivotal Phase III study of rolofylline (MK-7418), the Company"s investigational medicine for the treatment of acute heart failure, show that rolofylline did not meet the primary or secondary efficacy endpoints. While Merck will continue to analyze the data with outside experts, the Company will not file applications for regulatory approval this year. The results from this study will be presented at a medical meeting later this year.
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A Combination Of Common Genetic Variations Can Lead To Schizophrenia
A multi-national group of investigators, including a scientist at the University of North Carolina at Chapel Hill, has discovered that nearly a third of the genetic basis of schizophrenia may be attributed to the cumulative actions of thousands of common genetic variants. The effects of each of these genetic changes, innocuous on its own, add up to a significant risk for developing both schizophrenia and bipolar disorder.
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Supreme Court Nominee Sotomayor Resumes Meetings With Senators; Confirmation Vote Still Unclear
Judge Sonia Sotomayor, President Obama"s nominee for the Supreme Court, on Thursday will hold a third round of private meetings with senators who will be voting on her confirmation, the AP/Chicago Tribune reports. The AP/Tribune reports that by Friday, Sotomayor will have met with more than one-quarter of the Senate and a majority of members on the Senate Judiciary Committee, which will lead an as-yet-unscheduled set of hearings for her confirmation.The Judiciary Committee is expected to receive and examine a large collection of documents for the hearings -- including Sotomayor"s writings, speeches and unpublished rulings -- as part of a questionnaire response on personal and financial data, possible conflicts of interest and the procedure that led to her nomination. According to the AP/Tribune, the White House in recent days has been rallying support for Sotomayor, with first lady Michelle Obama on Wednesday talking about the nominee at a high school graduation (Hirschfeld Davis, AP/Chicago Tribune, 6/4).Meanwhile, Senate Judiciary Committee Chair Patrick Leahy (D-Vt.) and ranking member Jeff Sessions (R-Ala.) on Wednesday failed to reach an agreement on a timeline for Sotomayor"s confirmation hearings and vote, CongressDaily reports. According to CongressDaily, Democrats and Republicans generally are "at odds" over the issue, particularly over when the confirmation hearings should start (Friedman, CongressDaily, 6/3). Leahy said that he would like hearings to begin next month, with the goal of scheduling a confirmation vote before the month-long congressional recess that begins in early August. Sessions has called for the process to be spread out over the summer to allow committee members to analyze the large volume of Sotomayor"s records, with hearings beginning in September (AP/Chicago Tribune, 6/4).Leahy -- who will have the final say on the start of the hearings -- on Tuesday said that "it would be irresponsible to leave [Sotomayor] hanging out there" until September (CongressDaily, 6/3).
Nutrition

Progress Toward Artificial Tissue

For modern implants and the growth of artificial tissue and organs, it is important to generate materials with characteristics that closely emulate nature. However, the tissue in our bodies has a combination of traits that are very hard to recreate in synthetic materials: It is both soft and very tough. A team of Australian and Korean researchers led by Geoffrey M. Spinks and Seon Jeong Kim has now developed a novel, highly porous, sponge-like material whose mechanical properties closely resemble those of biological soft tissues. As reported in the journal Angewandte Chemie, it consists of a robust network of DNA strands and carbon nanotubes. Soft tissues, such as tendons, muscles, arteries, and skin or other organs, obtain their mechanical support from the extracellular matrix, a network of protein-based nanofibers. Different protein morphologies in the extracellular matrix produce tissue with a wide range of stiffness. Implants and scaffolding for tissue growth require porous, soft materials -- which are usually very fragile. Because many biological tissues are regularly subjected to intense mechanical loads, it is also important that the implant material have comparable elasticity in order to avoid inflammation. At the same time, the material must be very strong and resilient, or it may give out. The new concept uses DNA strands as a matrix; the strands completely "wrap" the scaffold-forming carbon nanotubes in the presence of an ionic liquid, networking them to form a gel. This gel can be spun: just as silk and synthetic fibers can be wet-spun for textiles, the gel can be made into very fine threads when injected into a special bath. The dried fibers have a porous, sponge-like structure and consist of a network of intertwined 50 nm-wide nanofibers. Soaking in a calcium chloride solution further cross-links the DNA, causing the fibers to become denser and more strongly connected. These spongy fibers resemble the collagen fiber networks of the biological extracellular matrix. They can also be knotted, braided, or woven into textile-like structures. This results in materials that are as elastic as the softest natural tissues while simultaneously deriving great strength from the robust DNA links. An additional advantage is the electrical conductivity of the new material, which can thus also be used in electrodes for mechanical actuators, energy storage, and sensors. For example, the researchers were able to produce a hydrogen peroxide sensor. The carbon nanotubes catalyze the oxidation of hydrogen peroxide, which results in a measurable current. Hydrogen peroxide plays a role in normal heart function and certain heart diseases. A robust sensor with elasticity similar to the heart muscle would be of great help in researching these relationships. Geoffrey M. Spinks Wiley-Blackwell


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