Archive for January, 2010

Predicting survival for pulmonary arterial hypertension patients

Setting out to determine the survival of patients with pulmonary arterial hypertension (PAH), researchers have discovered that an equation used for more than 20 years to predict survival is outdated. Accordingly, they developed a new survival prediction equation that will impact clinical practice and the drug development process.

Vaccine appears to ‘mop up’ leukemia cells Gleevec leaves behind

Preliminary studies show that a vaccine made with leukemia cells may be able to reduce or eliminate the last remaining cancer cells in some chronic myeloid leukemia patients taking the drug Imatinib mesylate (Gleevec).

Molecule repairs alcohol metabolism enzyme

About 1 billion people worldwide carry a genetic mutation that produces an inactive form of ALDH2, an important alcohol metabolism enzyme. When individuals with the ALDH2 mutation drink alcohol, the toxic compound acetaldehyde accumulates in the body. The inactive form of ALDH2 is linked to increased risk for cancer. Researchers found that an experimental compound restores the structure and function of the inactive enzyme, which suggests the possibility of a treatment for the enzyme defect.

More evidence that autism is a brain ‘connectivity’ disorder

Studying a rare disorder that also causes autism in 25-50 percent of affected patients, new research supports the emerging idea that autism results from disrupted brain “connectivity” causing improper information flow. These abnormalities might be reversible with rapamycin or rapamycin-like drugs, which the studies researchers will be bringing to clinical trial later this year.

Discovery of enzyme activation process could lead to new heart attack treatments

Medical researchers have determined how a “chemical chaperone” does its job in the body, which could lead to a new class of drugs to help reduce the muscle damage caused by heart attacks.

Metformin is safe for patients with advanced heart failure and diabetes mellitus, study shows

A new study has shown that metformin, a drug often used in the treatment of diabetes mellitus, is safe for use in treating patients who have both diabetes and advanced heart failure.

Rules governing RNA’s anatomy revealed

Researchers have discovered the rules that dictate the 3-D shapes of RNA molecules, rules that are based not on complex chemical interactions but simply on geometry.

Old antidepressant offers promise in treating heart failure

Researchers have found in animal experiments that an antidepressant developed over 40 years ago can blunt and even reverse the muscle enlargement and weakened pumping function associated with heart failure.

Research on rarely studied cell-receptor regions opens door to eliminating drugs’ side effects

Researchers have taken an early step toward identifying a new approach to drug discovery that may eventually yield drugs with fewer side effects.

Before or after birth, gene linked to mental health has different effects

Scientists have long eyed mutations in a gene known as DISC1 as a possible contributor to schizophrenia and mood disorders, including depression and bipolar disorder. Now, new research suggests that perturbing this gene during prenatal periods, postnatal periods or both may have different effects in mice, leading to separate types of brain alterations and behaviors with resemblance to schizophrenia or mood disorders.

Efficacy of flu vaccine drastically reduced for RA patients treated with rituximab

Rheumatoid arthritis (RA) patients are partially protected by the influenza vaccine 6-10 months after treatment with rituximab. Researchers determined that while the flu vaccine is safe, it is ineffective for RA patients in the first six months following rituximab treatment.

New mechanism underlying cocaine addiction discovered

Researchers have identified a key epigenetic mechanism in the brain that helps explain cocaine’s addictiveness.

UV LED therapy shows promising results in preventing focal seizures

Researchers have discovered that light from an ultraviolet diode (UV LED) reduced “seizure-like” activity in a rat epilepsy model. Results of this study have considerable potential in treating focal epilepsy in humans.

Experimental drug reduces tumor resistance to breast cancer therapy

Researchers have found a way to cleverly override signals that tell breast cancer cells to keep surviving in the face of anticancer treatment. The investigational agent they used renews the sensitivity of these breast cancer cells to treatment by fulvestrant which had stopped working.

Resistance to antibiotics can be drawback for bacteria

Neisseria meningitidis, the meningococcus, is a bacterium that can cause diseases with high fatality rates, and there has therefore been considerable concern that, like other bacteria, it might become resistant to antibiotics. But now a study shows that there has not been any increase in resistant meningococci in Sweden over the last 15 years. The reason for this may be that it is not especially advantageous for bacteria to develop resistance.

Benefit of antidepressant medications appears to vary with severity of depression symptoms

An analysis of randomized trials indicates that compared with placebo, the magnitude of benefit of antidepressant medications varies with the severity of depressive symptoms, and may provide little benefit for patients with mild or moderate depression, but appear to provide substantial benefit for patients with very severe depression, according to a new study.

Blood glucose self-monitoring: No benefit for non-insulin-dependent patients with type 2 diabetes, study finds

Contrary to the widely-held belief, there is no proof that non-insulin-dependent patients with type 2 diabetes benefit from glucose self-monitoring. Due to a lack of suitable trials, it remains unclear whether an additional benefit is displayed by the blood test compared to the urine test or vice versa, according to a new report.

Restaurant and packaged foods can have more calories than nutrition labeling indicates

Since people who are trying to reduce their weight are encouraged to choose meals labeled as “lower in calories” or “reduced energy” in restaurants and supermarkets, it is essential that the listed data are accurate. In a new study, researchers found that some commercially prepared foods contained more calories than indicated in nutritional labeling.

Electric field propels worms to test new drugs

Researchers have developed a way to view the effects of a proposed drug treatment in real time using a mild electrical field to stimulate C. elegans nematodes. The discovery opens up significant possibilities for developing high-throughput micro-screening devices for drug discovery and other applications for treating diseases such as Huntington’s, Parkinson’s and muscular dystrophy.

Biodegradable particles can bypass mucus, release drugs over time

Researchers have created biodegradable nanosized particles that can easily slip through the body’s sticky and viscous mucus secretions to deliver a sustained-release medication cargo.

Celebrex inhibits burden of skin cancer in high-risk patients, research finds

People with the heritable disorder of the skin called Gorlin syndrome who are genetically predisposed to develop basal cell carcinoma of the skin may have a new chemoprevention therapy on the horizon.

Natural compound blocks hepatitis C infection

Researchers have identified two cellular proteins that are important factors in hepatitis C virus infection, a finding that may result in the approval of new and less toxic treatments for the disease, which can lead to liver cancer and cirrhosis.

New Combination Therapy Looks Promising Against Ulcer Bacteria

Results of a new study reveal that a seven-day course of LOAD therapy is superior to LAC at eliminating the H. pylori bacterium in patients with gastritis and peptic ulcers.

SNPs in C-reactive protein are not associated with increased risk of cancer

Gene variants associated with increased circulating levels of C-reactive protein, a marker of inflammation, are not associated with an increased risk of cancer, according to a new study.

Blood test could improve graft-versus-host disease treatment

Researchers have identified the first biomarker of graft-versus-host disease of the skin. The discovery makes possible a simple blood test that should solve a treatment dilemma facing doctors with patients who frequently develop rashes after bone marrow transplants.

Unraveling kidney cancer: Mutations in the genome regulation machinery identified in clear cell renal cell carcinoma

Scientists have searched for mutations in more than 100 kidney cancer samples, the largest number of samples from a single tumor type to be sequenced to date. They looked for mutations in 3,544 genes to investigate the complexity within this cancer type, which is typically associated with mutations in a gene called VHL. Despite this prevalent genetic signature, the team revealed substantial genetic heterogeneity, suggesting that a complex machinery contributes to the development of cancer.

Genetic differences between lethal and treatable forms of leukemia discovered

A tumor’s genetic profile is often useful when diagnosing and deciding on treatment for certain cancers, but inexplicably, genetically similar leukemias in different patients do not always respond well to the same therapy. Researchers believe they may have discovered what distinguishes these patients by evaluating the “epigenetic” differences between patients with acute myeloid leukemia.

Sexual function does not continuously decline after radiation therapy treatments for prostate cancer, study finds

Sexual function in prostate cancer patients receiving external beam radiation therapy decreases within the first two years after treatment but then stabilizes and does not continuously decline as was previously thought, according to a new study.

Why light worsens migraine headaches

Scientists have identified a new visual pathway that underlies sensitivity to light during migraine in both blind individuals and in individuals with normal eyesight.

Silencing brain cells with yellow and blue light

Neuroscientists have developed a powerful new class of tools to reversibly shut down brain activity using different colors of light. When targeted to specific neurons, they could potentially lead to new treatments for abnormal brain activity associated with disorders including chronic pain, epilepsy, brain injury and Parkinson’s disease.

Fewer headaches on the horizon, thanks to latest guidelines

If you’re one of the millions of headache sufferers around the world, more effective relief might be on the way in years to come. That’s because the International Headache Society has just published new research guidelines intended to stimulate more research into headache treatment, and to provide researchers with guidelines to cut health risks associated with treatment.

Strength training, self-management improve outcomes for knee osteoarthritis

Researchers have determined that physically inactive, middle-aged people with symptomatic osteoarthritis benefited equally from strength training regimens, self-management programs, or a combination of the two.

New virus is not linked to chronic fatigue syndrome, suggests new research

New research has not reproduced previous findings that suggested chronic fatigue syndrome may be linked to a recently discovered virus. The authors of the study say this means that anti-retroviral drugs may not be an effective treatment for people with the illness.

Abuse in childhood linked to migraine and other pain disorders

Researchers have found that incidence of childhood maltreatment, especially emotional abuse and neglect, are prevalent in migraine patients.

Low mortality risk following knee and hip replacement

Total hip and total knee replacement surgeries are highly successful and very common procedures for people experiencing pain associated with degenerative joints. With a new hip or knee, and postoperative care prescribed by their doctors, most patients are able to regain a more active lifestyle with considerably less pain.

St. John’s wort not helpful treatment for irritable bowel syndrome, researchers say

St. John’s wort is not an effective treatment for irritable bowel syndrome (IBS) according to new research. While antidepressants are frequently used to treat IBS, to date, no study has examined the success of using the herbal supplement St. John’s wort in treating IBS.

Radiofrequency ablation safe and effective for reducing pain from bone metastases, study suggests

Image-guided radiofrequency ablation (RFA), a minimally invasive cancer treatment which can be performed in the outpatient setting, significantly reduced the level of pain experienced by cancer patients with bone (osseous) metastases, limiting the need for strong narcotic pain management, and supporting improved patient frame of mind, according to new results.

Pain management failing as fears of prescription drug abuse rise

Millions of Americans with significant or chronic pain associated with their medical problems are being under-treated as physicians increasingly fail to provide comprehensive pain treatment — either due to inadequate training, personal biases or fear of prescription drug abuse.

Why light worsens migraine headaches

Scientists have identified a new visual pathway that underlies sensitivity to light during migraine in both blind individuals and in individuals with normal eyesight.

Observation about how nervous system learns and encodes motion could improve stroke recovery

Bioengineers have taken a small step toward improving physical recovery in stroke patients by showing that a key feature of how limb motion is encoded in the nervous system plays a crucial role in how new motor skills are learned. The study about the neural learning elements responsible for motor learning may help scientists design rehabilitation protocols in which motor adaptation occurs more readily, potentially allowing for a more rapid recovery.

Researcher links diabetic complication to nerve damage in bone marrow

Scientists have discovered a link between diabetes and bone marrow nerve damage that may help treat one of the disease’s most common and potentially blindness-causing complications.

Alzheimer’s: Immune system alterations in mouse brain reduces two characteristic features of disease

Using laboratory mice that had been bred to have brain changes similar to Alzheimer’s disease, scientists were able to reduce two characteristic features of the disease by modifying the mice’s immune systems with a special peptide related to the myelin sheath that insulates nerve cells and nerve fibers. As a result, anti-inflammatory cells were recruited from the blood into the brain, dampening the local inflammatory response.

Uniform method to interpret autism spectrum disorders

The main criterion defining autism spectrum disorders is difficulty in emotional-social behavior. Nevertheless, many people with ASD have some difficulties in three other domains — memory, perception and motor behavior. In a new theoretical model, one researcher recommends a uniform way to think about these four types of difficulties, which she believes are linked by a common brain structure/brain function connection involving the medial prefrontal cortex.

Acute stress leaves epigenetic marks on the hippocampus

In trying to explain psychiatric disorders, genes simply cannot tell the whole story. The real answers are in the interaction of genes and the environment. Post-traumatic stress disorder requires some trauma, for instance, and people, for the most part, aren’t born depressed. Now research has revealed one mechanism by which a stressful experience changes the way that genes are expressed in the rat brain. The discovery of “epigenetic” regulation of genes in the brain is helping change the way scientists think about psychiatric disorders and could open new avenues to treatment.

New ALS drug slips through telling Phase II clinical trials

A drug already used to treat symptoms of epilepsy has potential to slow the muscle weakening that comes with amyotrophic lateral sclerosis (ALS), scientists report after completing a Phase II clinical trial — an early, small-scale test to show if the drug works and continues to be safe.

Alzheimer’s: How amyloid beta reduces plasticity related to synaptic signaling

The early stages of Alzheimer’s disease are thought to occur at the synapse, since synapse loss is associated with memory dysfunction. Evidence suggests that amyloid beta plays an important role in early synaptic failure, but little has been understood about amyloid beta’s effect on the plasticity of dendritic spines.

Scientists discover a controller of brain circuitry

By combining a research technique that dates back 136 years with modern molecular genetics, a neuroscientist has been able to see how a mammal’s brain shrewdly revisits and reuses the same molecular cues to control the complex design of its circuits.

Brain scans show distinctive patterns in people with generalized anxiety disorder

Scrambled connections between the part of the brain that processes fear and emotion and other brain regions could be the hallmark of a common anxiety disorder, according to a new study. The findings could help researchers identify biological differences between types of anxiety disorders as well as such disorders as depression.

Common mechanism underlies many diseases of excitability

Inherited mutations in voltage-gated sodium channels are associated with many different human diseases, including genetic forms of epilepsy and chronic pain. New research has now determined the functional consequence of three such mutations. These results suggest that there might be a common mechanism underlying diseases caused by mutations in voltage-gated sodium channels.

Schizophrenia mouse model should improve understanding and treatment of the disorder

Scientists have created what appears to be a schizophrenic mouse by reducing the inhibition of brain cells involved in complex reasoning and decisions about appropriate social behavior.