Jon Hamilton There's new evidence that mild pulses of electricity can relieve depression — if they reach the right target in the brain. A study of 25 people with epilepsy found that those who had symptoms of depression felt better almost immediately when doctors electrically stimulated an area of the brain just above the eyes, a team reported Thursday in the journal Current Biology. These people were in the hospital awaiting surgery and had wires inserted into their brains to help doctors locate the source of their seizures. Several of the patients talked about the change they felt when the stimulation of the lateral orbitofrontal cortex began, says Kristin Sellers, an author of the paper and a postdoctoral researcher at the University of California, San Francisco. One person's response was: "Wow, I feel a lot better. ... What did you guys do?" The stimulation only lasted a few minutes. After it stopped, the effect on mood quickly faded. To be sure that the effect was real, the researchers also pretended to stimulate the lateral OFC in the same patients without actually running current through the tiny wires implanted in their brains. In those sham treatments, there was no discernible change. DBS is an approved treatment for tremors, including those associated with Parkinson's disease. But results with depression have been less consistent, and DBS isn't approved for this purpose by the Food and Drug Administration. © 2018 npr

Keyword: Depression
Link ID: 25735 - Posted: 11.30.2018

By Abby Ellin The issue was peanut butter. No matter what form it took — creamy, crunchy, straight from the jar or smeared between two slices of bread — it caused Sunny Gold enormous anxiety. In fact, the gooey spread posed such a threat that during her first few years of recovery from binge eating disorder, between 2006 and 2007, Ms. Gold, 42, a communications specialist in Portland, Ore., couldn’t keep it around the house. It was one of her favorite foods, and she feared she would binge on it. Just knowing it was there, lurking in her cupboard, made her feel “unsafe,” as she put it. And that’s when things got really tricky. Because her boyfriend at the time, John Pavlus, didn’t think twice about peanut butter — or any food, for that matter. When Ms. Gold, the author of “Food: The Good Girl’s Drug,” told him that it would be a casualty of her getting healthy, he was taken aback. “It was a bit uncomfortable for me at first,” Mr. Pavlus, a 40-year-old writer and filmmaker, admitted. He knew that Ms. Gold had grappled with binge eating since she was a teenager, but food was something they’d bonded over. So when she decided that she needed to “cut herself off,” he felt that he was losing something, “less for the practical inconvenience than the unexpected feeling of being subtly disconnected from her,” he said. “It was strange to think of these parts of our shared reality as being so radically — to me — redefined. Is peanut butter literally dangerous now? Does that mean I have to treat it that way too? Will it be like this forever?” Mr. Pavlus’s reaction is echoed by many romantic partners of someone with an eating disorder, many of whom — though certainly not all — are women. Partners often want to help, but simply don’t know how. © 2018 The New York Times Company

Keyword: Anorexia & Bulimia
Link ID: 25734 - Posted: 11.30.2018

By Frankie Schembri Fruit flies might not sing songs, make art, or don traditional garments, but that doesn’t mean they don’t have culture. New evidence suggests female fruit flies (Drosophila melanogaster) can create unique dating customs based on the partners they see other female fruit flies select. Cultural traditions—the traits and behaviors that are handed down across generations and spread through social learning—have been found in the grooming patterns of certain apes and the songs of some whales and birds. But scientists had little proof that smaller creatures such as insects could have culture. So researchers set up a series of experiments in which one “observer” female fruit fly watched a “demonstrator” fly pick between two males that differed only in their color—pink or green. When it was their turn to mate, observers chose the same color of mate more than 80% of the time, compared with random chance, researchers report today in Science. The team also tested how reliably preferences were passed to the next generation by placing 12 observers in the center of a hexagonal container surrounded by six demonstrators who went exclusively for either pink or green males. In the next round of mating, the first observers to mate became the demonstrators. Over the course of 36 trials, the pink or green preference “trickled down” to the eighth generation of flies before they started to choose randomly again. © 2018 American Association for the Advancement of Science

Keyword: Sexual Behavior
Link ID: 25733 - Posted: 11.30.2018

By Roni Caryn Rabin A. A deficiency of vitamin B12 can cause neurological and psychiatric problems that “can progress if left untreated, and can lead to irreversible damage,” said Dr. Donald Hensrud, director of the Mayo Clinic’s Healthy Living Program. Fortunately, it can be reversed fairly easily with vitamin pills or injections. Vitamin B12 is required for proper red blood cell formation, nerve function and DNA synthesis. It is naturally present in fish, meat, eggs and dairy products, as well as some fortified breakfast cereals and nutritional yeast products. Strict vegans who avoid animal products can develop a deficiency of B12 over time if they don’t take a supplement. But two-thirds of cases occur in the elderly, who are susceptible because they may not absorb adequate amounts of B12 from foods but who are not routinely tested, Dr. Hensrud said. Consequences of B12 deficiency can cause a range of symptoms that include fatigue, weakness, constipation, loss of appetite and weight loss. Other symptoms include difficulty maintaining balance, depression, confusion, dementia, poor memory and soreness in the mouth or tongue. B12 deficiency may also result in a form of anemia called megaloblastic anemia, which can also result from a deficiency of folic acid, another B vitamin. If anemia is detected on blood tests, levels of both vitamins should be checked. Neurological symptoms can, however, occur in the absence of anemia. Early treatment is critical to avoid potentially irreversible damage. Older adults are susceptible to B12 deficiency because they may have decreased secretion of hydrochloric acid in the stomach, which makes it difficult to absorb B12. Also vulnerable to B12 deficiency are those with gastrointestinal disorders like celiac disease or Crohn’s disease; those who have had weight loss or other gastrointestinal surgery; and those who use certain acid reflux drugs or the diabetes drug metformin. Individuals with pernicious anemia, which affects up to 2 percent of older adults, are also susceptible. © 2018 The New York Times Company

Keyword: Depression
Link ID: 25732 - Posted: 11.30.2018

By R. Douglas Fields SAN DIEGO—In the textbook explanation for how information is encoded in the brain, neurons fire a rapid burst of electrical signals in response to inputs from the senses or other stimulation. The brain responds to a light turning on in a dark room with the short bursts of nerve impulses, called spikes. Each close grouping of spikes can be compared to a digital bit, the binary off-or-on code used by computers. Neuroscientists have long known, though, about other forms of electrical activity present in the brain. In particular, rhythmic voltage fluctuations in and around neurons—oscillations that occur at the same 60-cycle-per-second frequency as AC current in the U.S.—have caught the field’s attention. These gamma waves encode information by changing a signal’s amplitude, frequency or phase (relative position of one wave to another)—and the rhythmic voltage surges influence the timing of spikes. Heated debate has arisen in recent years as to whether these analog signals, akin to the ones used to broadcast AM or FM radio, may play a role in sorting, filtering and organizing the information flows required for cognitive processes. They may be instrumental in perceiving sensory inputs, focusing attention, making and recalling memories and coupling various cognitive processes into one coherent scene. It is thought that populations of neurons that oscillate at gamma frequencies may unite the neural activity in the same way the violin section of an orchestra is coupled together in time and rhythm with the percussion section to create symphonic music. When gamma waves oscillate in resonance, “you get very rich repertoires of behaviors,” says Wolf Singer, a neuroscientist at the Ernst Strüngmann Institute in Frankfurt, Germany, who researches gamma waves. Just as your car’s dashboard will vibrate in sync with the motor vibrating at a resonant frequency, so too can separate populations of neurons couple in resonance. © 2018 Scientific American

Keyword: Brain imaging
Link ID: 25731 - Posted: 11.29.2018

By Michael Allen When a peacock catches the attention of a female, he doesn’t just turn her head—he makes it vibrate. That’s the surprising conclusion of a new study, which finds that a male peafowl’s tail feathers create low-frequency sounds that cause feathers on the females’ heads to quiver. The finding is “fascinating,” says Richard Prum, an evolutionary ornithologist at Yale University who was not involved with the work. As far as he knows, it’s the first demonstration that feathers respond to acoustic communication signals from other birds. Scientists have long known that a bird’s feathers can sense vibrations. Much like a rodent’s whiskers, they are coupled to vibration-sensitive nerve cells, allowing them to sense their surroundings. Feathers can, for example, detect changes in airflow during flight, and some seabirds even use feathers on their heads to feel their way through dark, underground crevices. When peacocks are ready to mate, they fan out their iridescent tail feathers (known as trains), before rushing at females, shaking those feathers to catch their attention. But when researchers discovered low-frequency sounds—which are inaudible to humans—coming from this “train rattle” several years back, no one knew how they worked. All they knew was that peahens perked up and paid attention to recordings of these “infrasounds,” even though they couldn’t see the males. © 2018 American Association for the Advancement of Science

Keyword: Sexual Behavior; Animal Communication
Link ID: 25730 - Posted: 11.29.2018

Ashley Yeager About a decade ago, Clemson University chemist John Huffman started getting calls from law enforcement agencies. Officials from the Drug Enforcement Administration (DEA) and other federal agencies wanted to know more about JWH-18, a synthetic cannabinoid bearing Huffman’s initials that he’d created in the lab in 2004 and described in scientific paper in 2005. The compound was turning up in incense, which, rather than being burnt for its scent, was being smoked and was making people sick. Huffman’s intent, like other scientists who had generated synthetic cannabinoids over the years, was not to create recreational drugs. It was to study the effects of cannabis in the body and how the cannabinoid system works, as well as to develop molecules to image areas of the brain. “The chemistry to make these things is very simple and very old,” Huffman told The Washington Post in 2015. “You only have three starting materials and only two steps. In a few days, you could make 25 grams, which could be enough to make havoc.” And havoc it’s been. The number of emergency room visits as a result of smoking synthetic cannabinoids, often laced with other drugs, is in the thousands annually, and poison control centers have seen a spike in calls about the compounds in recent years, with nearly 8,000 in 2015. Called K2 or Spice, these synthetic compounds first started sickening Americans in 2008, with illnesses reported in Europe before the drugs reached the US. In 2011, the DEA made it illegal to sell JWH-018 and four related compounds or products that contained them, but that hasn’t kept new synthetic cannabinoids from emerging on the illegal drug market and leading to life-threatening overdoses. © 1986 - 2018 The Scientist

Keyword: Drug Abuse
Link ID: 25729 - Posted: 11.29.2018

Aimee Cunningham Children who turn 5 just before starting kindergarten are much more likely to be diagnosed with attention-deficit/hyperactivity disorder than their oldest classmates. The finding bolsters concerns that the common neurodevelopmental disorder may be overdiagnosed. “We think ... it’s the relative age and the relative immaturity of the August-born children in any given class that increases the likelihood that they’re diagnosed as having ADHD,” says Anupam Jena, a physician and economist at Harvard Medical School. Jena and his colleagues analyzed insurance claims data for more than 407,000 children born from 2007 through 2009. In states that require kids be 5 years old by September 1 to begin kindergarten, children born in August were 34 percent more likely to be diagnosed with ADHD than those born nearly a year earlier in September — just after the cutoff date. For August kids, 85.1 per 10,000 children were diagnosed with ADHD, compared with 63.6 per 10,000 for the September kids, the researchers report in the Nov. 29 New England Journal of Medicine. People with ADHD typically have symptoms of inattention, hyperactivity and impulsiveness that are severe or frequent enough to interfere with their daily lives. In 2011, 11 percent of U.S. children aged 4 to 17 were reported to have an ADHD diagnosis, a rate higher than most other countries. Differences between states also suggest overdiagnosis, says Jena, “unless there’s something so different about kids across different states.” For example, while nearly 19 percent of 4- to 17-year-olds reportedly were diagnosed in Kentucky, the rate was about 12 percent in neighboring West Virginia. |© Society for Science & the Public 2000 - 2018

Keyword: ADHD
Link ID: 25728 - Posted: 11.29.2018

David DiSalvo Coffee has been getting considerable attention for a growing list of health benefits, with brain health high among them. While not without a few downsides, studies have shown impressive upsides of moderate coffee consumption, often linked to its high caffeine content. But a new lab study suggests that when it comes to brain health, coffee offers more than the stimulating effects of our favorite legal drug–in fact, decaf could be just as effective. The study began with a question: why has previous research found that coffee consumption correlates with lower risk of developing neurodegenerative diseases like Alzheimer’s and Parkinson’s? “We wanted to investigate why that is—which compounds [in coffee] are involved and how they may impact age-related cognitive decline," said lead study author Dr. Donald Weaver, co-director of the Krembil Brain Institute in Toronto. To investigate why, the research team evaluated several compounds (including caffeine) released during the roasting process in three types of coffee beans: caffeinated dark roast, caffeinated light roast, and decaffeinated dark roast. The analysis focused on how the compounds interact with amyloid beta and tau, the toxic proteins linked to the development of Alzheimer’s disease. Results from previous studies suggest that coffee compounds could provide a neuroprotective effect by inhibiting these proteins from forming the terminally disruptive clumps and tangles found in the brains of Alzheimer’s patients. ©2018 Forbes Media LLC

Keyword: Drug Abuse
Link ID: 25727 - Posted: 11.29.2018

Shawna Williams The sensation of perceiving a smell can be induced in people by using electrodes to stimulate the brain’s olfactory bulb, researchers report today (November 27) in the International Forum of Allergy & Rhinology. The results, they suggest, are a proof of concept that it would be possible to develop an “olfactory implant system” to aid people with an impaired sense of smell, known as anosmia. “Our work shows that smell restoration technology is an idea worth studying further,” says coauthor Eric Holbrook of Massachusetts Eye and Ear Infirmary in a press release. “The development of cochlear implants, for example, didn’t really accelerate until someone placed an electrode in the cochlea of a patient and found that the patient heard a frequency of some type.” Holbrook and colleagues enrolled five subjects in the study who were able to smell. Three of them reported perceiving odors not actually present when the researchers stimulated different parts of their olfactory bulbs with electrodes inserted through the nose, a procedure the study authors say caused “minimal discomfort.” Subjects described the smells as “onion-like,” “antiseptic-like,” “sour,” “fruity,” or simply “bad.” The finding follows a report earlier this year that electrically stimulating structures high up in the nasal cavity produced smell sensations. The scientists who conducted that study at Malaysia’s Imagineering Institute aim to one day transmit smells electronically, reportes IEEE Spectrum—for example, to give restaurant-goers a whiff of dishes on the menu as they decide what to order. © 1986 - 2018 The Scientist

Keyword: Chemical Senses (Smell & Taste)
Link ID: 25726 - Posted: 11.29.2018

Abby Olena In 2005, a 23-year-old woman in the UK was involved in a traffic accident that left her with a severe brain injury. Five months after the event, she slept and woke and could open her eyes, but she didn’t always respond to smells or touch or track things visually. In other words, she fit the clinical criteria for being in a vegetative state. In a study published in Science in 2006, a team of researchers tested her ability to imagine herself playing tennis or walking through her house while they observed activity in her brain using functional magnetic resonance imaging (fMRI). Remarkably, her brain responded with activity in the same areas of the brains of healthy people when asked to do the same, indicating that she was capable of complex cognition, despite her apparent unresponsiveness at the bedside. The findings indicated that this patient and others like her may have hidden cognitive abilities that, if found, could potentially help them communicate or improve their prognosis. Since then, researchers and clinicians around the world have used task-based neuroimaging to determine that other patients who appear unresponsive or minimally conscious can do challenging cognitive tasks. The problem is that the tests to uncover hidden consciousness can be complex to analyze, expensive to perform, and hard for all patients to access. “You would like to know if people who look like they’re unconscious are actually following what’s going on and able to carry out cognitive work, and we don’t have an efficient way of sorting those patients,” says Nicholas Schiff, a neuroscientist at Weill Cornell Medical College in New York City. © 1986 - 2018 The Scientist

Keyword: Consciousness; Brain imaging
Link ID: 25725 - Posted: 11.27.2018

By Bahar Gholipour When Ryan Darby was a neurology resident, he was familiar with something called alien limb syndrome, but that did not make his patients’ behavior any less puzzling. Individuals with this condition report that one of their extremities—often a hand—seems to act of its own volition. It might touch and grab things or even unbutton a shirt the other hand is buttoning up. Patients are unable to control the rebellious hand short of grabbing or even sitting on it. They seem to have lost agency—that unmistakable feeling of ownership of one’s actions and an important component of free will. “It was one of those symptoms that really questioned the mind and how it brings about some of those bigger concepts,” says Darby, now an assistant professor of neurology at Vanderbilt University. Alien limb syndrome can arise after a stroke causes a lesion in the brain. But even though patients who have it report the same eccentric symptoms, their lesions do not occur in the same place. “Could the reason be that the lesions were just in different parts of the same brain network?” Darby wondered. To find out, he and his colleagues compiled findings from brain-imaging studies of people with the syndrome. They also looked into akinetic mutism—a condition that leaves patients with no desire to move or speak, despite having no physical impediment. Using a new technique, the researchers compared lesion locations against a template of brain networks—that is, groups of regions that often activate in tandem. © 2018 Scientific American

Keyword: Consciousness
Link ID: 25724 - Posted: 11.27.2018

Scientists at the National Eye Institute (NEI) have found that neurons in the superior colliculus, an ancient midbrain structure found in all vertebrates, are key players in allowing us to detect visual objects and events. This structure doesn’t help us recognize what the specific object or event is; instead, it’s the part of the brain that decides something is there at all. By comparing brain activity recorded from the right and left superior colliculi at the same time, the researchers were able to predict whether an animal was seeing an event. The findings were published today in the journal Nature Neuroscience. NEI is part of the National Institutes of Health. Perceiving objects in our environment requires not just the eyes, but also the brain’s ability to filter information, classify it, and then understand or decide that an object is actually there. Each step is handled by different parts of the brain, from the eye’s light-sensing retina to the visual cortex and the superior colliculus. For events or objects that are difficult to see (a gray chair in a dark room, for example), small changes in the amount of visual information available and recorded in the brain can be the difference between tripping over the chair or successfully avoiding it. This new study shows that this process – deciding that an object is present or that an event has occurred in the visual field – is handled by the superior colliculus. “While we’ve known for a long time that the superior colliculus is involved in perception, we really wanted to know exactly how this part of the brain controls the perceptual choice, and find a way to describe that mechanism with a mathematical model,” said James Herman, Ph.D., lead author of the study.

Keyword: Vision
Link ID: 25723 - Posted: 11.27.2018

Jef Akst After publishing a 2014 study showing that noninvasive magnetic stimulation of the brain boosted people’s ability to remember an association between two items, Northwestern University neuroscientist Joel Voss began fielding a lot of questions from patients and their families. “We’re of course guarded in the publication talking about what we found—small but reliable increases in memory ability,” he says (Science, 345:1054–57). But some of the news coverage of that paper alluded to the procedure’s potential to treat Alzheimer’s disease and other memory-related disorders. “I got calls—at least two a day for quite a long period of time—and emails: ‘My loved one is suffering from X, Y, or Z; thank God now you can cure it. How do we get to your lab?’” Voss says. He would have to explain to them that this was a scientific study, not an approved treatment. “There are a million steps between here and there, and maybe it would never work—we don’t really know.” But Voss’s team continues to connect those dots, in hopes that one day the technique—the use of magnetic fields to influence activity in neurons close to the brain’s surface—could help patients with any number of brain disorders, and perhaps cognitively healthy people as well. In August, the researchers reported that transcranial magnetic stimulation (TMS) could moderately improve episodic memory—the ability to remember people, events, and other things you’ve encountered in your life (as opposed to, say, how to do something)—when targeted at the correct part of the brain. Voss and his colleagues were interested in activating the hippocampus, a structure near the brain’s center that serves as a hub of memory production and storage. Because the hippocampus itself is inaccessible by TMS—the magnetic field falls off precipitously with depth, explains Voss—the researchers instead targeted areas of the brain where activity correlated with activity in the hippocampus, to try to activate the networks that link more-superficial regions with the deep-brain structure. © 1986 - 2018 The Scientist

Keyword: Learning & Memory
Link ID: 25722 - Posted: 11.27.2018

By Abby Goodnough DAYTON, Ohio — Dr. Randy Marriott clicked open the daily report he gets on drug overdoses in the county. Only one in the last 24 hours — stunningly low compared to the long lists he used to scroll through last year in a grim morning routine. “They just began to abruptly drop off,” said Dr. Marriott, who oversees the handoff of patients from local rescue squads to Premier Health, the region’s biggest hospital system. Overdose deaths in Montgomery County, anchored by Dayton, have plunged this year, after a stretch so bad that the coroner’s office kept running out of space and having to rent refrigerated trailers. The county had 548 overdose deaths by Nov. 30 last year; so far this year there have been 250, a 54 percent decline. Dayton, a hollowed-out manufacturing center at the juncture of two major interstates, had one of the highest opioid overdose death rates in the nation in 2017 and the worst in Ohio. Now, it may be at the leading edge of a waning phase of an epidemic that has killed hundreds of thousands of people in the United States over the last decade, including nearly 50,000 last year. For the first time in years, the number of opioid deaths nationwide has begun to dip, according to preliminary data from the Centers for Disease Control and Prevention — with totals for the preceding 12 months falling slightly but steadily between December 2017 and April 2018. The flattening curve — along with declining opioid prescription rates and survey data suggesting far fewer Americans tried heroin last year and more got addiction treatment — is the first encouraging news in a while. While it’s too soon to know if the improvement is part of a long-term trend, it is clear there are some lessons to be learned from Dayton. The New York Times spent several days here interviewing police and public health officials; doctors, nurses and other treatment providers; people recovering from opioid addiction and people who are still using heroin and other drugs. © 2018 The New York Times Company

Keyword: Drug Abuse
Link ID: 25721 - Posted: 11.26.2018

Robin McKie Science Editor Lawyers are bringing a case against a London hospital trust that could trigger major changes to the rules governing patient confidentiality. The case involves a woman who is suing doctors because they failed to tell her about her father’s fatal hereditary disease before she had her own child. The woman discovered – after giving birth – that her father carried the gene for Huntington’s disease, a degenerative, incurable brain condition. Later she found out she had inherited the gene and that her own daughter, now eight, has a 50% chance of having it. The woman – who cannot be named for legal reasons – says she would have had an abortion had she known about her father’s condition, and is suing the doctors who failed to tell her about the risks she and her child faced. It is the first case in English law to deal with a relative’s claim over issues of genetic responsibility. “This could really change the way we do medicine, because it is about the duty that doctors have to share genetic test results with relatives and whether the duty exists in law,” said Anna Middleton, head of society and ethics research at the Wellcome Genome Campus in Cambridge. Experts say that as more is discovered about the genetic components of medical conditions, including cancer and dementia, doctors will come under increasing pressure to consider not only their patients’ needs but also those of relatives who may share affected genes. The case also raises questions over how much effort clinicians need to put into tracing relatives, and whether they will be sued if their attempts do not go far enough. © 2018 Guardian News and Media Limited

Keyword: Huntingtons
Link ID: 25720 - Posted: 11.26.2018

By Lisa Sanders, M.D. “Something’s wrong,” the 27-year-old woman said to her new husband. “I think you need to take me to the hospital.” It was the day after their wedding. The woman’s husband and her best friend were car fanatics, and so the newlyweds had wanted to commemorate their union with pictures at a drift track in rural Toutle, Wash. The best friend would “drift cookies,” circling the couple in a tight, controlled skid. As another friend took pictures, the two embraced, wreathed by smoke and dust and barely contained chaos as the red Mustang fishtailed around them. In the photos, the couple look happy. But as they loaded up the car to go home, the young woman started to feel strange. She’d been a little jittery all day. She noticed she couldn’t stop talking. She figured it was just the excitement of the wedding’s aftermath. But suddenly her excitement felt out of control. Her heart, which was racing since she got up that morning, went into overdrive. It pounded so hard that it hurt her throat and chest. She couldn’t think. Her hands took on a life of their own — they opened and closed incessantly. Her new husband was confused and worried. They drove to a hospital a couple of towns over. It was a panic attack, they were told. Since the birth of the couple’s daughter a year before, the young woman had struggled with postpartum depression and anxiety. She’d just married and had these crazy pictures taken; it was no wonder she was panicking. The young woman accepted the diagnosis, but she couldn’t help feeling that this was different from the anxiety she sometimes experienced. She was given a medication to take if she had more symptoms and sent home. The pills didn’t seem to help. The next day she felt her heart pounding in her throat and the same spacy-headed jitters from the day before. She tried the medicine again but after that, her memory is just fragments. © 2018 The New York Times Company

Keyword: Schizophrenia; Neuroimmunology
Link ID: 25719 - Posted: 11.26.2018

At 35, Sharon Jakab knew something was wrong when she started hallucinating. "I saw my grandmother on the wall in the room. She was talking to me. I wasn't sleeping, and I was a mess," she says from her home in Burlington, Ont. Jakab had been suffering from postpartum depression following the birth of her daughter. About a year and a half later, Jakab had another episode of postpartum depression following an ectopic pregnancy. It became so bad, she was suicidal. "There was a gun in the house and there were cartridges. I was all set to kill myself." She had to suicide-proof her home by taking away all dangerous objects, even skates, which have sharp blades. Now 61, Jakab has been in and out of hospitals, dealing with what she calls "waves of depression" that have lasted most of her adult life. She's tried about a dozen medications, including the antipsychotic drug clozapine. "Clozapine really helped me a lot, but I still suffered from depression, psychosis and mania." Because standard treatment like medication and therapy weren't effective, Jakab was diagnosed with treatment-resistant depression, a severe form of depression that close to a million Canadians experience. Electroconvulsive therapy or ECT, better known as shock treatment, is still considered the go-to treatment but comes with the common side effect of memory loss. So doctors are now exploring less invasive experimental approaches like brain stimulation that rewires the brain's circuits. ©2018 CBC/Radio-Canada

Keyword: Depression
Link ID: 25718 - Posted: 11.26.2018

By Mitch Leslie Unlike most cells in our bodies, the neurons in our brain can scramble their genes, scientists have discovered. This genome tampering may expand the brain’s protein repertoire, but it may also promote Alzheimer’s disease, their study suggests. “It’s potentially one of the biggest discoveries in molecular biology in years,” says Geoffrey Faulkner, a molecular biologist at the University of Queensland in Brisbane, Australia, who wasn’t connected to the research. “It is a landmark study,” agrees clinical neurologist Christos Proukakis of University College London. Scientists first discovered that certain cells could shuffle and edit DNA in the 1970s. Some immune cells snip out sections of genes that code for proteins that detect or fight pathogens and splice the remaining pieces together to create new varieties. Our B cells, for example, can potentially spawn about 1 quadrillion types of antibodies, enough to fend off an enormous range of bacteria, viruses, and other attackers. Scientists have seen hints that such genomic reshuffling—known as somatic recombination—happens in our brain. Neurons there often differ dramatically from one another. They often have more DNA or different genetic sequences than the cells around them. To look for definitive evidence of somatic recombination in the brain, neuroscientist Jerold Chun of the Sanford Burnham Prebys Medical Discovery Institute in San Diego, California, and colleagues analyzed neurons from the donated brains of six healthy elderly people and seven patients who had the noninherited form of Alzheimer’s disease, which accounts for most cases. The researchers tested whether the cells harbored different versions of the gene for the amyloid precursor protein (APP), the source of the plaques in the brains of people with Alzheimer’s disease. APP’s gene was a good candidate to examine, the researchers thought, because one of their previous studies suggested neurons from patients with Alzheimer’s disease can harbor extra copies of the gene, an increase that could arise from somatic recombination. © 2018 American Association for the Advancement of Science

Keyword: Alzheimers
Link ID: 25716 - Posted: 11.24.2018

Sara Reardon Drug companies have spent billions of dollars searching for therapies to reverse or significantly slow Alzheimer’s disease, to no avail. Some researchers argue that the best way to make progress is to create better animal models for research, and several teams are now developing mice that more closely simulate how the disease devastates people’s brains. The US National Institutes of Health (NIH), the UK Dementia Research Institute and Jackson Laboratory (JAX) — one of the world’s biggest suppliers of lab mice — are among the groups trying to genetically engineer more sophisticated rodents. Scientists are also probing the complex web of mutations that influences neurological decline in mice and people. “We appreciate that the models we had were insufficient,” says Bruce Lamb, a neuroscientist at Indiana University in Indianapolis who directs the NIH-funded programme. “I think it’s sort of at a critical juncture right now.” Alzheimer’s is marked by cognitive impairment and the build-up of amyloid-protein plaques in the brains of people, but the disease does not occur naturally in mice. Scientists get around this by studying mice that have been genetically modified to produce high levels of human amyloid protein. These mice develop plaques in their brains, but they still do not display the memory problems seen in people. Many experimental drugs that have successfully removed plaques from mouse brains have not lessened the symptoms of Alzheimer’s disease in people. One high-profile stumble came last month, when three companies reported that their Alzheimer’s drugs — from a class called BACE inhibitors — had failed in large, late-stage clinical trials. Although the drugs successfully blocked the accumulation of amyloid protein in mice, they seemed to worsen cognitive decline and brain shrinkage in people. © 2018 Springer Nature Limited.

Keyword: Alzheimers
Link ID: 25715 - Posted: 11.24.2018