Chapter 3. Neurophysiology: The Generation, Transmission, and Integration of Neural Signals
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Sara Reardon Every time something poked its foot, the mouse jumped in pain. Researchers at Circuit Therapeutics, a start-up company in Menlo Park, California, had made the animal hypersensitive to touch by tying off a nerve in its leg. But when they shone a yellow light on its foot while poking it, the mouse did not react. The treatment is one of several nearing clinical use that draw on optogenetics — a technique in which light is used to control genes and neuron firing. In March, RetroSense Therapeutics of Ann Arbor, Michigan, began the first clinical-safety trial of an optogenetic therapy to treat the vision disorder retinitis pigmentosa. Many scientists are waiting to see how the trial turns out before they decide how to move forward with their own research on a number of different applications. “I think it will embolden people if there’s good news,” says Robert Gereau, a pain researcher at Washington University in St Louis, Missouri. “It opens up a whole new range of possiblilities for how to treat neurological diseases.” Retinitis pigmentosa destroys photoreceptors in the eye. RetroSense’s treatment seeks to compensate for this loss by conferring light sensitivity to retinal ganglion cells, which normally help to pass visual signals from photoreceptors to the brain. The therapy involves injecting patients who are blind or mostly blind with viruses carrying genes that encode light-sensitive proteins called opsins. The cells fire when stimulated with blue light, passing the visual information to the brain. Chief executive Sean Ainsworth says that the company has injected several individuals in the United States with the treatment, and plans to enroll a total of 15 blind patients in its trial. RetroSense will follow them for two years, but may release some preliminary data later this year. © 2016 Nature Publishing Group
Link ID: 22235 - Posted: 05.21.2016
Bret Stetka Last year, in an operating room at the University of Toronto, a 63-year-old women with Alzheimer's disease experienced something she hadn't for 55 years: a memory of her 8-year-old self playing with her siblings on their family farm in Scotland. The woman is a patient of Dr. Andres Lozano, a neurosurgeon who is among a growing number of researchers studying the potential of deep brain stimulation to treat Alzheimer's and other forms of dementia. If the approach pans out it could provide options for patients with fading cognition and retrieve vanished memories. Right now, deep brain stimulation is used primarily to treat Parkinson's disease and tremor, for which it's approve by the Food and Drug Administration. DBS involves delivering electrical impulses to specific areas of the brain through implanted electrodes. The technique is also approved for obsessive-compulsive disorder and is being looked at for a number of other brain disorders, including depression, chronic pain and, as in Lozano's work, dementia. In 2008 Lozano's group published a study in which an obese patient was treated with deep brain stimulation of the hypothalamus. Though no bigger than a pea, the hypothalamus is a crucial bit of brain involved in appetite regulation and other bodily essentials such as temperature control, sleep and circadian rhythms. It seemed like a reasonable target in trying to suppress excessive hunger. To the researcher's surprise, following stimulation the patient reported a sensation of deja vu. He also perceived feeling 20 years younger and recalled a memory of being in a park with friends, including an old girlfriend. With increasing voltages his memories became more vivid. He remembered their clothes. © 2016 npr
Keyword: Learning & Memory
Link ID: 22213 - Posted: 05.14.2016
By John Elder Robison Manipulating your brain with magnetic fields sounds like science fiction. But the technique is real, and it’s here. Called transcranial magnetic stimulation (TMS), it is approved as a therapy for depression in the US and UK. More controversially, it is being studied as a way to treat classic symptoms of autism, such as emotional disconnection. With interest and hopes rising, it’s under the spotlight at the International Meeting for Autism Research in Baltimore, Maryland, next week. I can bear witness to the power of TMS, which induces small electrical currents in neurons. As someone with Asperger’s, I tried it for medical research, and described its impact in my book Switched On. After TMS, I could see emotional cues in other people – signals I had always been blind to, but that many non-autistic people pick up with ease. That sounds great, so why the need for debate? Relieving depression isn’t controversial, because there is no question people suffer as a result of it. I too felt that I suffered – from emotional disconnection. But changing “emotional intelligence” to relieve that comes closer to changing the essence of how we think. Yes, emerging brain therapies like TMS have great potential. Several of the volunteers who went into the TMS lab at Harvard Medical School emerged with new self-awareness, and lasting changes. While I can’t speak with certainty for the others, I believe some of us have a degree of emotional insight that we didn’t have before. I certainly feel better able to fit in. As fellow participant Michael Wilcox put it, we have more emotional reactions to things we see or read. © Copyright Reed Business Information Ltd.
Link ID: 22187 - Posted: 05.07.2016
By Jennifer Jolly Every January for the past decade, Jessica Irish of Saline, Mich., has made the same New Year’s Resolution: to “cut out late night snacking and lose 30 pounds.” Like millions of Americans, Ms. Irish, 31, usually makes it about two weeks. But this year is different. “I’ve already lost 18 pounds,” she said, “and maintained my diet more consistently than ever. Even more amazing — I rarely even think about snacking at night anymore.” Ms. Irish credits a new wearable device called Pavlok for doing what years of diets, weight-loss programs, expensive gyms and her own willpower could not. Whenever she takes a bite of the foods she wants to avoid, like chocolate or Cheez-Its, she uses the Pavlok to give herself a lightning-quick electric shock. “Every time I took a bite, I zapped myself,” she said. “I did it five times on the first night, two times on the second night, and by the third day I didn’t have any cravings anymore.” As the name suggests, the $199 Pavlok, worn on the wrist, uses the classic theory of Pavlovian conditioning to create a negative association with a specific action. Next time you smoke, bite your nails or eat junk food, one tap of the device or a smartphone app will deliver a shock. The zap lasts only a fraction of a second, though the severity of the shock is up to you. It can be set between 50 volts, which feels like a strong vibration, and 450 volts, which feels like getting stung by a bee with a stinger the size of an ice pick. (By comparison, a police Taser typically releases about 50,000 volts.) Other gadgets and apps dabble in behavioral change by way of aversion therapy, such as the $49 MotivAider that is worn like a pager, or the $99 RE-vibe wristband. Both can be set to vibrate at specific intervals as a reminder of a habit to break or a goal to reach. The $80 Lumo Lift posture coach is a wearable disk that vibrates when you slouch. The $150 Spire clip-on sensor tracks physical activity and state of mind by detecting users’ breathing patterns. If it detects you’re stressed or anxious, it vibrates or sends a notification to your smartphone to take a deep breath. © 2016 The New York Times Company
Keyword: Learning & Memory
Link ID: 22171 - Posted: 05.03.2016
By Julia Shaw In the last couple of years memory science has really upped its game. I generally write about social processes that can change our memories, but right now I can’t help but get excited that memory science is getting an incredible new toy to play with. A toy that I believe will revolutionise how we talk about, and deal with, memory. This not-so-new sounding, but totally-newly-applied, neuroscience toy is ultrasound. Ultrasound is also called sonography and is essentially a type of ‘medical sonar’. It has revolutionized medicine since the 1940s, giving us the ability to look into the body in a completely safe way (without leaving icky radiation behind, like xrays). Beyond predicting whether your baby shower will be blue or pink, lesser known applications of ultrasound include the ability to essentially burn and destroy cells inside your body. As such, it has been successfully used to do surgery without making any cuts into the human body. This is a technique that has been used to remove cancerous cells while not affecting any of the surrounding tissue, and without any of the side-effects associated with other kinds of cancer treatment. This is referred to by scientist Yoav Medan as focused ultrasound. If you are unfamiliar with this, you need to watch this TED talk. Non-invasive procedures like this are the future of surgery. Non-invasive procedures are also the future of neuroscience. It is at this point that we find ourselves at the application of this astonishing science to memory research. © 2016 Scientific American
By Emily Underwood Earlier this month, György Buzsáki of New York University (NYU) in New York City showed a slide that sent a murmur through an audience in the Grand Ballroom of New York’s Midtown Hilton during the annual meeting of the Cognitive Neuroscience Society. It wasn’t just the grisly image of a human cadaver with more than 200 electrodes inserted into its brain that set people whispering; it was what those electrodes detected—or rather, what they failed to detect. When Buzsáki and his colleague, Antal Berényi, of the University of Szeged in Hungary, mimicked an increasingly popular form of brain stimulation by applying alternating electrical current to the outside of the cadaver’s skull, the electrodes inside registered little. Hardly any current entered the brain. On closer study, the pair discovered that up to 90% of the current had been redirected by the skin covering the skull, which acted as a “shunt,” Buzsáki said. For many meeting attendees, the unusual study heightened serious doubts about the mechanism and effectiveness of transcranial direct current stimulation (tDCS), an experimental, noninvasive treatment that uses electrodes to deliver weak current to a person’s forehead, and the related tACS, which uses alternating current. Little is known about how these techniques might influence the brain. Yet many scientific papers have claimed that the techniques can boost mood, alleviate chronic pain, and even make people better at math by directly affecting neuronal activity. This has spawned a cottage industry of do-it-yourself gadgets promising to make people smarter and happier. © 2016 American Association for the Advancement of Science
Link ID: 22126 - Posted: 04.21.2016
Helen Shen Clamping an electrode to the brain cell of a living animal to record its electrical chatter is a task that demands finesse and patience. Known as ‘whole-cell patch-clamping’, it is reputedly the “finest art in neuroscience”, says neurobiologist Edward Boyden, and one that only a few dozen laboratories around the world specialize in. But researchers are trying to demystify this art by turning it into a streamlined, automated technique that any laboratory could attempt, using robotics and downloadable source code. “Patch-clamping provides a unique view into neural circuits, and it’s a very exciting technique but is really underused,” says neuroscientist Karel Svoboda at the Howard Hughes Medical Institute’s Janelia Research Campus in Ashburn, Virginia. “That’s why automation is a really, really exciting direction.” On 3 March, Boyden, at the Massachusetts Institute of Technology in Cambridge, and his colleagues published detailed instructions on how to assemble and operate an automated system for whole-cell patch-clamping1, a concept that they first described in 20122. The guide represents the latest fruits of Boyden’s partnership with the laboratory of Craig Forest, a mechanical engineer at the Georgia Institute of Technology in Atlanta who specializes in robotic automation for research. © 2016 Nature Publishing Group
Keyword: Brain imaging
Link ID: 22066 - Posted: 04.04.2016
By Ariana Eunjung Cha LAS VEGAS — Jamie Tyler was stressed. He had just endured a half-hour slog through airport security and needed some relief. Many travelers in this situation might have headed for the nearest bar or popped an aspirin. But Tyler grabbed a triangular piece of gadgetry from his bag and held it to his forehead. As he closed his eyes, the device zapped him with low-voltage electrical currents. Within minutes, Tyler said, he was feeling serene enough to face the crowds once again. This is no science fiction. The Harvard-trained neurobiologist was taking advantage of one of his own inventions, a device called Thync, which promises to help users activate their body's “natural state of energy or calm” — for a retail price of a mere $199. Americans’ obsession with wellness is fueling a new category of consumer electronics, one that goes far beyond the ubiquitous Fitbits and UP activity wristbands that only passively monitor users' physical activity. The latest wearable tech, to put it in the simplest terms, is about hacking your brain. These gadgets claim to be able to make you have more willpower, think more creatively and even jump higher. One day, their makers say, the technology may even succeed in delivering on the holy grail of emotions: happiness. There’s real, peer-reviewed science behind the theory driving these devices. It involves stimulating key regions of the brain — with currents or magnetic fields — to affect emotions and physical well-being.
Link ID: 22053 - Posted: 03.31.2016
We might finally be figuring out how an increasingly popular therapy that uses electricity to boost the brain’s functioning has its effects – by pushing up levels of calcium in cells. Transcranial direct current stimulation (tDCS) involves using electrodes to send a weak current across the brain. Stimulating brain tissue like this has been linked to effects ranging from accelerating learning to improving the symptoms of depression and faster recovery from strokes. The broad consensus is that tDCS does this by lowering the threshold at which neurons fire, making it easier for them to pass on electrical signals. This leads to changes in the connectivity between neurons and alters information processing. But the cellular mechanisms that lead to such broad neurological changes are not clear and some researchers suggest that tDCS may not have any effect on the brain. Despite the doubts, devices are being developed for sale to people keen to influence their own brains. Now Hajime Hirase at the RIKEN Brain Science Institute in Tokyo, Japan, and his colleagues may have found an answer. They have identified large, sudden surges in calcium flow in the brains of mice seconds after they receive low doses of tDCS. These surges seem to start in cells called astrocytes – star-shaped cells that don’t fire themselves, but help to strengthen the connections between neurons and regulate the electrical signals that pass between them. © Copyright Reed Business Information Ltd.
Mo Costandi Researchers in the United States have developed a new method for controlling the brain circuits associated with complex animal behaviours, using genetic engineering to create a magnetised protein that activates specific groups of nerve cells from a distance. Understanding how the brain generates behaviour is one of the ultimate goals of neuroscience – and one of its most difficult questions. In recent years, researchers have developed a number of methods that enable them to remotely control specified groups of neurons and to probe the workings of neuronal circuits. The most powerful of these is a method called optogenetics, which enables researchers to switch populations of related neurons on or off on a millisecond-by-millisecond timescale with pulses of laser light. Another recently developed method, called chemogenetics, uses engineered proteins that are activated by designer drugs and can be targeted to specific cell types. Although powerful, both of these methods have drawbacks. Optogenetics is invasive, requiring insertion of optical fibres that deliver the light pulses into the brain and, furthermore, the extent to which the light penetrates the dense brain tissue is severely limited. Chemogenetic approaches overcome both of these limitations, but typically induce biochemical reactions that take several seconds to activate nerve cells. The new technique, developed in Ali Güler’s lab at the University of Virginia in Charlottesville, and described in an advance online publication in the journal Nature Neuroscience, is not only non-invasive, but can also activate neurons rapidly and reversibly. © 2016 Guardian News and Media Limited
Keyword: Brain imaging
Link ID: 22034 - Posted: 03.26.2016
By ANDREW POLLACK An experimental drug derived from marijuana has succeeded in reducing epileptic seizures in its first major clinical trial, the product’s developer announced on Monday, a finding that could lend credence to the medical marijuana movement. The developer, GW Pharmaceuticals, said the drug, Epidiolex, achieved the main goal of the trial, reducing convulsive seizures when compared with a placebo in patients with Dravet syndrome, a rare form of epilepsy. GW shares more than doubled on Monday. If Epidiolex wins regulatory approval, it would be the first prescription drug in the United States that is extracted from marijuana. The drug is a liquid containing cannabidiol, a component of marijuana that does not make people high. As many as 30 percent of the nearly 500,000 American children with epilepsy are not sufficiently helped by existing drugs, according to GW. Parents of some of these children have been flocking to try marijuana extracts, prepared by medical marijuana dispensaries. A number of states, in response to pressure from these parents, have passed or considered legislation to make it easier to obtain marijuana-based products. And some families have become “marijuana refugees,” moving to Colorado where it has been easier to obtain a particular extract, known as Charlotte’s Web, after the girl who first used it to control seizures. Hundreds of other children and young adults have been using Epidiolex outside of clinical trials, under programs that allow desperate patients to use experimental drugs. While many parents have reported significant reductions in seizures, experts have been cautious about anecdotal reports, saying that such treatments needed to be compared with a placebo to make sure they work. As such, the results from the GW trial have been closely watched. © 2016 The New York Times Company
By Sandra G. Boodman Kim Pace was afraid he was dying. In six months he had lost more than 30 pounds because a terrible stabbing sensation on the left side of his face made eating or drinking too painful. Brushing his teeth was out of the question and even the slightest touch triggered waves of agony and a shocklike pain he imagined was comparable to electrocution. Painkillers, even morphine, brought little relief. Unable to work and on medical leave from his job as a financial consultant for a bank, Pace, then 59, had spent the first half of 2012 bouncing among specialists in his home state of Pennsylvania, searching for help from doctors who disagreed about the nature of his illness. Some thought his searing pain might be the side effect of a drug he was taking. Others suspected migraines, a dental problem, mental illness, or an attempt to obtain painkillers. Even after a junior doctor made what turned out to be the correct diagnosis, there was disagreement among specialists about its accuracy or how to treat Pace. His wife, Carol, a nurse, said she suspects that the couple’s persistence and propensity to ask questions led her husband to be branded “a difficult case” — the kind of patient whom some doctors avoid. And on top of that, a serious but entirely unrelated disorder further muddied the diagnostic picture. So on July 17, 2012, when Pace told his wife he thought he was dying, she fired off an emotional plea for help to the office of a prominent specialist in Baltimore. “I looked at Kim and it hit me: He was going to die,” she said. “He was losing weight and his color was ashen” and doctors were “blowing him off. I thought, ‘Okay, that’s it,’ and the nurse in me took over.”
By Simon Makin Brain implants have been around for decades—stimulating motor areas to alleviate Parkinson's disease symptoms, for example—but until now they have all suffered from the same limitation: because brains move slightly during physical activity and as we breathe and our heart beats, rigid implants rub and damage tissue. This means that eventually, because of both movement and scar-tissue formation, they lose contact with the cells they were monitoring. Now a group of researchers, led by chemist Charles Lieber of Harvard University, has overcome these problems using a fine, flexible mesh. In 2012 the team showed that cells could be grown around such a mesh, but that left the problem of how to get one inside a living brain. The solution the scientists devised was to draw the mesh—measuring a few millimeters wide—into a syringe, so it would roll up like a scroll inside the 100-micron-wide needle, and inject it through a hole in the skull. In a study published in Nature Nanotechnology last year, the team injected meshes studded with 16 electrodes into two brain regions in mice. The mesh is composed of extremely thin, nanoscale polymer threads, sparsely distributed so that 95 percent of it is empty space. It has a level of flexibility similar to brain tissue. “You're starting to make this nonliving system look like the biological system you're trying to probe,” Lieber explains. “That's been the goal of my group's work, to blur the distinction between electronics as we know it and the computer inside our heads.” © 2016 Scientific American
Keyword: Brain imaging
Link ID: 21950 - Posted: 03.03.2016
By Sheena Goodyear, A brain implant the size of a paper-clip might one day help paralyzed people regain the ability to use their arms and legs via a wireless connection that will transmit their thoughts to an exoskeleton. It's not the first technology to allow paralyzed people to operate mechanical limbs with signals from their brain, but it has the potential to revolutionize the field because it's minimally invasive and totally wireless. It's made possible because of a matchstick-sized implant called a stentrode, crafted from nitinol, an alloy that is commonly used in brassiere underwires and eyeglass frames, according to a study published in the journal Nature Biotechnology. "It's really a new method for getting brain data out of the brain without performing brain surgery," Thomas Oxley, a neurologist at the University of Melbourne who designed the device, told CBC News. "Part of the reason that brain-machine interfaces have not been successful to this point is because they get rejected by the body, and the reason they get rejected is because they all require direct implantation into the brain. And to do that you have to take off the skull — you have to perform a craniotomy." ©2016 CBC/Radio-Canada.
Link ID: 21886 - Posted: 02.11.2016
By Diana Kwon Stories of cannabis’s abilities to alleviate seizures have been around for about 150 years but interest in medical marijuana has increased sharply in the last decade with the help of legalization campaigns. Credit: ©iStock Charlotte Figi, an eight-year-old girl from Colorado with Dravet syndrome, a rare and debilitating form of epilepsy, came into the public eye in 2013 when news broke that medical marijuana was able to do what other drugs could not: dramatically reduce her seizures. Now, new scientific research provides evidence that cannabis may be an effective treatment for a third of epilepsy patients who, like Charlotte, have a treatment-resistant form of the disease. Last month Orrin Devinsky, a neurologist at New York University Langone Medical Center, and his colleagues across multiple research centers published the results from the largest study to date of a cannabis-based drug for treatment-resistant epilepsy in The Lancet Neurology. The researchers treated 162 patients with an extract of 99 percent cannabidiol (CBD), a nonpsychoactive chemical in marijuana, and monitored them for 12 weeks. This treatment was given as an add-on to the patients’ existing medications and the trial was open-label (everyone knew what they were getting). The researchers reported the intervention reduced motor seizures at a rate similar to existing drugs (a median of 36.5 percent) and 2 percent of patients became completely seizure free. Additionally, 79 percent of patients reported adverse effects such as sleepiness, diarrhea and fatigue, although only 3 percent dropped out of the study due to adverse events. “I was a little surprised that the overall number of side effects was quite high but it seems like most of them were not enough that the patients had to come off the medication,” says Kevin Chapman, a neurology and pediatric professor at the University of Colorado School of Medicine who was not involved in the study. “I think that [this study] provides some good data to show that it's relatively safe—the adverse effects were mostly mild and [although] there were serious adverse effects, it's always hard to know in such a refractory population whether that would have occurred anyway.” © 2016 Scientific American,
Finding out what’s going on in an injured brain can involve several rounds of surgery, exposed wounds and a mess of wires. Perhaps not for much longer. A device the size of a grain of rice can monitor the brain’s temperature and pressure before dissolving without a trace. “This fully degradable sensor is definitely an impressive feat of engineering,” says Frederik Claeyssens, a biomaterials scientist at the University of Sheffield, UK. The device is the latest creation from John Rogers’s lab at the University of Illinois at Urbana-Champaign. They came up with the idea of a miniature dissolvable brain monitor after speaking to neurosurgeons about the difficulties of monitoring brain temperature and pressure in people with traumatic injuries. Unwieldy wires These vital signs are currently measured via an implanted sensor connected to an external monitor. “It works, but the wires coming out of the head limit physical movement and provide a nidus for infection. You can cause additional damage when you pull them out,” says Rogers. It would be better to use a wireless device that doesn’t need to be extracted, he says. So Rogers’s team developed an electronic monitor about a tenth of a millimetre wide and a millimetre long made of silicon and a polymer. These materials, used in tiny amounts, are eventually broken down by the body, and don’t trigger any harmful effects, says Rogers. “The materials individually are safe. The total amount is very small. It’s about 1000 times less than what you’d have in a vitamin tablet.” © Copyright Reed Business Information Ltd.
Keyword: Brain imaging
Link ID: 21799 - Posted: 01.19.2016
Fergus Walsh Medical correspondent UK doctors in Sheffield say patients with multiple sclerosis (MS) are showing "remarkable" improvements after receiving a treatment usually used for cancer. About 20 patients have received bone marrow transplants using their own stem cells. Some patients who were paralysed have been able to walk again. Prof Basil Sharrack, of Sheffield's Royal Hallamshire Hospital, said: "To have a treatment which can potentially reverse disability is really a major achievement." Around 100,000 people in the UK have MS, an incurable neurological condition. Most patients are diagnosed in their 20s and 30s. The disease causes the immune system to attack the lining of nerves in the brain and spinal cord. The treatment - known as an autologous haematopoietic stem cell transplant (HSCT) - aims to destroy the faulty immune system using chemotherapy. It is then rebuilt with stem cells harvested from the patient's own blood. These cells are at such an early stage they've not developed the flaws that trigger MS. Prof John Snowden, consultant haematologist at Royal Hallamshire Hospital, said: "The immune system is being reset or rebooted back to a time point before it caused MS." About 20 MS patients have been treated in Sheffield in the past three years. Prof Snowden added: "It's clear we have made a big impact on patients' lives, which is gratifying." In MS the protective layer surrounding nerve fibres in the brain and spinal cord - known as myelin - becomes damaged. The immune system mistakenly attacks the myelin, causing scarring or sclerosis. © 2016 BBC.
By Stephani Sutherland A technique called optogenetics has transformed neuroscience during the past 10 years by allowing researchers to turn specific neurons on and off in experimental animals. By flipping these neural switches, it has provided clues about which brain pathways are involved in diseases like depression and obsessive-compulsive disorder. “Optogenetics is not just a flash in the pan,” says neuroscientist Robert Gereau of Washington University in Saint Louis. “It allows us to do experiments that were not doable before. This is a true game changer like few other techniques in science.” Since the first papers were published on optogenetics in the mid-aughts some researchers have mused about one day using optogenetics in patients, imagining the possibility of an off-switch for depression, for instance. The technique, however, would require that a patient submit to a set of highly invasive medical procedures: genetic engineering of neurons to insert molecular switches to activate or switch off cells, along with threading of an optical fiber into the brain to flip those switches. Spurred on by a set of technical advances, optogenetics pioneer Karl Deisseroth, together with other Stanford University researchers, has formed a company to pursue optogenetics trials in patients within the next several years—one of several start-ups that are now contemplating clinical trials of the technique. Circuit Therapeutics, founded in 2010, is moving forward with specific plans to treat neurological diseases. (It also partners with pharmaceutical companies to help them use optogenetics in animal research to develop novel drug targets for human diseases.) © 2016 Scientific America
Keyword: Pain & Touch
Link ID: 21758 - Posted: 01.07.2016
By Diana Kwon Symptoms come and go in most cases of multiple sclerosis (MS), a chronic disease in which the immune system attacks myelin, the nonconductive sheath that surrounds neurons' axons. Yet 10 to 15 percent of cases are progressive rather than relapsing. This more severe version appears later in life and is marked by steadily worsening symptoms. No treatments are currently available, but that might be about to change. In September pharmaceutical company Hoffmann–La Roche announced positive results from three large clinical trials of ocrelizumab, an injectable antibody medication that targets B cells, for both relapsing and progressive MS. They found that the drug was more effective at treating relapsing MS than interferon beta-1a (Rebif), a top-performing drug now used to treat the disease. Even more exciting, it slowed the advance of symptoms in patients with progressive MS for the entire 12-week duration of the study. “The drug has dramatic effects on relapsing MS, and we finally have our foot in the door with the progressive form,” says Stephen Hauser, a neurologist at the University of California, San Francisco, who was involved in the trials. The fact that ocrelizumab works on both types of MS is a tantalizing clue for scientists trying to understand the root causes of the disease and figure out why the inflammation of the relapsing form eventually turns into progressive degeneration in some patients. “These results give evidence that the inflammatory and the degenerative components of MS are related,” Hauser says. “The big question now is, If we begin treatment really early, can we protect relapsing patients from developing the progressive problems later on?” © 2015 Scientific American
Keyword: Multiple Sclerosis
Link ID: 21724 - Posted: 12.27.2015
When anticonvulsant drugs fail to control epilepsy, surgery can be used as a last resort: removing the part of the brain thought to be the source of someone’s seizures. Unfortunately, this doesn’t always work. A computer model of brain activity could change things for the better by allowing surgeons to more precisely tailor the procedure to the individual. Seizures are caused by sudden surges in electrical activity in the brain. EEG scans made during a seizure can capture what is going on, providing a clue to the part of the brain that needs to be cut out. Even so, the surgery still fails to prevent seizures in 30 per cent of cases. There are other ways to track down the source of someone’s seizures, however. For example, the connectivity of the brain’s neurons and the surface area of affected regions is different in people with epilepsy compared with those who do not have the condition. Frances Hutchings at Newcastle University, UK and her colleagues have shown that these differences can be picked up using a combination of fMRI scans and diffusion tensor imaging (DTI). They used this data to model the brains of 22 people with epilepsy. By simulating the brain’s electrical activity, they were able to see where it went awry and identify the region where seizures were most likely to originate in each individual. © Copyright Reed Business Information Ltd.