Progress in High-Speed Spin Testing of Superconducting Wire and Tapes for High-Field NMR Magnet Qualification.

This paper summarizes the status of a 3-year, NIH-funded research project to study the strength of high temperature superconductors under high circumferential hoop stress, in order to qualify these materials for high-field (> 1 GHz-class NMR magnets. The unique approach presented here is to spin test coils at high rotational speeds, approaching 100,000 rpm, in order to induce the necessary hoop stress. Thermal strain compatibility between the Bi-2212 wire and Inconel wire has been qualified, including thermal cycling. Assembly and testing of the first low-speed (< 30,000 rpm) rotor is now in process, and the design of second, higher speed (> 60,000 rpm) rotor, is also underway.

Metabolomics: Perspectives on potential biomarkers in organ transplantation and immunosuppressant toxicity.

Organ transplantation is the treatment of choice for many end stage diseases. The development and appropriate use of new immunosupressants have considerably improved the outcome of patients in the last decades. However, noninvasive, sensitive and specific biomarkers for early detection of complications leading to graft dysfunction are still needed. Current transplantation monitoring mostly relies on non-specific biochemical tests whereas diagnosis of rejection is generally based on invasive procedures such as biopsies. New approaches based on large scale profiling of body fluids and tissues are needed to address the complexity and multifactorial aspect of organ transplantation complications. Metabolomics aim to characterize and quantify the metabolome, which is the collection of the low-molecular weight compounds rising from metabolic pathways. Extracted from tissues or detected in body fluids, the small molecules are measured using nuclear magnetic resonance spectroscopy or mass spectrometry. By profiling the downstream products of cellular activity, metabolomics is most likely to represent the immediate cellular response to stresses. Diagnostic applications have been proposed in cancer, cardiovascular diseases, kidney diseases, neurological diseases and many more. This review will focus on the potential applications of metabolomics in organ transplantation including follow up of graft function recovery, diagnostic of alloimmune rejection as well as monitoring of immunosuppressant toxicity.

Circulating miRNAs as sensitive and specific biomarkers for the diagnosis and monitoring of human diseases: promises and challenges.

The regulation and modulation of gene expression has been a central focus of modern biomedical research ever since the first molecular elucidation of DNA. The cellular mechanisms by which genes are expressed and repressed hold valuable insight for maintaining tissue homeostasis or conversely provide mechanistic understanding of disease progression. Hence, the discovery of the first miRNA in humans roughly a decade ago profoundly shook the previously established dogmas of gene regulation. Since, these small RNAs of around 20 nucleotides have unquestionably influenced almost every area of medical research. This momentum has now spread to the clinical arena. Hundreds of papers have already been published shedding light on the mechanisms of action of miRNAs, their profound stability in almost every bodily fluid and relating their presence to disease state and severity of disease progression. In this review, we explore the diagnostic potential of miRNAs in the clinical laboratory with a focus on studies reporting the detection of miRNAs in blood and urine for investigation of human disease. Sensitivities, specificities, areas under the curve, group descriptions and miRNAs of interest for 69 studies covering a broad range of diseases are provided. We discuss the practicality of miRNAs in the screening, diagnosis and prognosis of a range of pathologies. Characteristics and pitfalls of miRNA detection in blood are also discussed. The topics covered here are pertinent in the design of future miRNA-based detection strategies for use in clinical biochemistry laboratory settings.

miRNAs: their discovery, biogenesis and mechanism of action.

The field of miRNA research is evolving at a very fast pace. Since their discovery almost 20years ago, miRNAs have proven to be of tremendous importance to normal physiological homeostasis as well as to the pathogenesis of major diseases such as cancer. Recent advances describe a key contribution for miRNAs in a wide variety of cellular processes ranging from embryonic development, cell proliferation and apoptosis to prominent roles in disease progression. miRNAs are now of central interest to biomedical research. Here we provide an overview of their discovery, biogenesis and mechanism of action.