Chronic Pain
Biomedical Research Leads Science’s 2021 Breakthroughs
Posted on by Lawrence Tabak, D.D.S., Ph.D.
Hi everyone, I’m Larry Tabak. I’ve served as NIH’s Principal Deputy Director for over 11 years, and I will be the acting NIH director until a new permanent director is named. In my new role, my day-to-day responsibilities will certainly increase, but I promise to carve out time to blog about some of the latest research progress on COVID-19 and any other areas of science that catch my eye.
I’ve also invited the directors of NIH’s Institutes and Centers (ICs) to join me in the blogosphere and write about some of the cool science in their research portfolios. I will publish a couple of posts to start, then turn the blog over to our first IC director. From there, I envision alternating between posts from me and from various IC directors. That way, we’ll cover a broad array of NIH science and the tremendous opportunities now being pursued in biomedical research.
Since I’m up first, let’s start where the NIH Director’s Blog usually begins each year: by taking a look back at Science’s Breakthroughs of 2021. The breakthroughs were formally announced in December near the height of the holiday bustle. In case you missed the announcement, the biomedical sciences accounted for six of the journal Science’s 10 breakthroughs. Here, I’ll focus on four biomedical breakthroughs, the ones that NIH has played some role in advancing, starting with Science’s editorial and People’s Choice top-prize winner:
Breakthrough of the Year: AI-Powered Predictions of Protein Structure
The biochemist Christian Anfinsen, who had a distinguished career at NIH, shared the 1972 Nobel Prize in Chemistry, for work suggesting that the biochemical interactions among the amino acid building blocks of proteins were responsible for pulling them into the final shapes that are essential to their functions. In his Nobel acceptance speech, Anfinsen also made a bold prediction: one day it would be possible to determine the three-dimensional structure of any protein based on its amino acid sequence alone. Now, with advances in applying artificial intelligence to solve biological problems—Anfinsen’s bold prediction has been realized.
But getting there wasn’t easy. Every two years since 1994, research teams from around the world have gathered to compete against each other in developing computational methods for predicting protein structures from sequences alone. A score of 90 or above means that a predicted structure is extremely close to what’s known from more time-consuming work in the lab. In the early days, teams more often finished under 60.
In 2020, a London-based company called DeepMind made a leap with their entry called AlphaFold. Their deep learning approach—which took advantage of 170,000 proteins with known structures—most often scored above 90, meaning it could solve most protein structures about as well as more time-consuming and costly experimental protein-mapping techniques. (AlphaFold was one of Science’s runner-up breakthroughs last year.)
This year, the NIH-funded lab of David Baker and Minkyung Baek, University of Washington, Seattle, Institute for Protein Design, published that their artificial intelligence approach, dubbed RoseTTAFold, could accurately predict 3D protein structures from amino acid sequences with only a fraction of the computational processing power and time that AlphaFold required [1]. They immediately applied it to solve hundreds of new protein structures, including many poorly known human proteins with important implications for human health.
The DeepMind and RoseTTAFold scientists continue to solve more and more proteins [1,2], both alone and in complex with other proteins. The code is now freely available for use by researchers anywhere in the world. In one timely example, AlphaFold helped to predict the structural changes in spike proteins of SARS-CoV-2 variants Delta and Omicron [3]. This ability to predict protein structures, first envisioned all those years ago, now promises to speed fundamental new discoveries and the development of new ways to treat and prevent any number of diseases, making it this year’s Breakthrough of the Year.
Anti-Viral Pills for COVID-19
The development of the first vaccines to protect against COVID-19 topped Science’s 2020 breakthroughs. This year, we’ve also seen important progress in treating COVID-19, including the development of anti-viral pills.
First, there was the announcement in October of interim data from Merck, Kenilworth, NJ, and Ridgeback Biotherapeutics, Miami, FL, of a significant reduction in hospitalizations for those taking the anti-viral drug molnupiravir [4] (originally developed with an NIH grant to Emory University, Atlanta). Soon after came reports of a Pfizer anti-viral pill that might target SARS-CoV-2, the novel coronavirus that causes COVID-19, even more effectively. Trial results show that, when taken within three days of developing COVID-19 symptoms, the pill reduced the risk of hospitalization or death in adults at high risk of progressing to severe illness by 89 percent [5].
On December 22, the Food and Drug Administration (FDA) granted Emergency Use Authorization (EUA) for Pfizer’s Paxlovid to treat mild-to-moderate COVID-19 in people age 12 and up at high risk for progressing to severe illness, making it the first available pill to treat COVID-19 [6]. The following day, the FDA granted an EUA for Merck’s molnupiravir to treat mild-to-moderate COVID-19 in unvaccinated, high-risk adults for whom other treatment options aren’t accessible or recommended, based on a final analysis showing a 30 percent reduction in hospitalization or death [7].
Additional promising anti-viral pills for COVID-19 are currently in development. For example, a recent NIH-funded preclinical study suggests that a drug related to molnupiravir, known as 4’-fluorouridine, might serve as a broad spectrum anti-viral with potential to treat infections with SARS-CoV-2 as well as respiratory syncytial virus (RSV) [8].
Artificial Antibody Therapies
Before anti-viral pills came on the scene, there’d been progress in treating COVID-19, including the development of monoclonal antibody infusions. Three monoclonal antibodies now have received an EUA for treating mild-to-moderate COVID-19, though not all are effective against the Omicron variant [9]. This is also an area in which NIH’s Accelerating COVID-19 Therapeutic Interventions and Vaccines (ACTIV) public-private partnership has made big contributions.
Monoclonal antibodies are artificially produced versions of the most powerful antibodies found in animal or human immune systems, made in large quantities for therapeutic use in the lab. Until recently, this approach had primarily been put to work in the fight against conditions including cancer, asthma, and autoimmune diseases. That changed in 2021 with success using monoclonal antibodies against infections with SARS-CoV-2 as well as respiratory syncytial virus (RSV), human immunodeficiency virus (HIV), and other infectious diseases. This earned them a prominent spot among Science’s breakthroughs of 2021.
Monoclonal antibodies delivered via intravenous infusions continue to play an important role in saving lives during the pandemic. But, there’s still room for improvement, including new formulations highlighted on the blog last year that might be much easier to deliver.
CRISPR Fixes Genes Inside the Body
One of the most promising areas of research in recent years has been gene editing, including CRISPR/Cas9, for fixing misspellings in genes to treat or even cure many conditions. This year has certainly been no exception.
CRISPR is a highly precise gene-editing system that uses guide RNA molecules to direct a scissor-like Cas9 enzyme to just the right spot in the genome to cut out or correct disease-causing misspellings. Science highlights a small study reported in The New England Journal of Medicine by researchers at Intellia Therapeutics, Cambridge, MA, and Regeneron Pharmaceuticals, Tarrytown, NY, in which six people with hereditary transthyretin (TTR) amyloidosis, a condition in which TTR proteins build up and damage the heart and nerves, received an infusion of guide RNA and CRISPR RNA encased in tiny balls of fat [10]. The goal was for the liver to take them up, allowing Cas9 to cut and disable the TTR gene. Four weeks later, blood levels of TTR had dropped by at least half.
In another study not yet published, researchers at Editas Medicine, Cambridge, MA, injected a benign virus carrying a CRISPR gene-editing system into the eyes of six people with an inherited vision disorder called Leber congenital amaurosis 10. The goal was to remove extra DNA responsible for disrupting a critical gene expressed in the eye. A few months later, two of the six patients could sense more light, enabling one of them to navigate a dimly lit obstacle course [11]. This work builds on earlier gene transfer studies begun more than a decade ago at NIH’s National Eye Institute.
Last year, in a research collaboration that included former NIH Director Francis Collins’s lab at the National Human Genome Research Institute (NHGRI), we also saw encouraging early evidence in mice that another type of gene editing, called DNA base editing, might one day correct Hutchinson-Gilford Progeria Syndrome, a rare genetic condition that causes rapid premature aging. Preclinical work has even suggested that gene-editing tools might help deliver long-lasting pain relief. The technology keeps getting better, too. This isn’t the first time that gene-editing advances have landed on Science’s annual Breakthrough of the Year list, and it surely won’t be the last.
The year 2021 was a difficult one as the pandemic continued in the U.S. and across the globe, taking far too many lives far too soon. But through it all, science has been relentless in seeking and finding life-saving answers, from the rapid development of highly effective COVID-19 vaccines to the breakthroughs highlighted above.
As this list also attests, the search for answers has progressed impressively in other research areas during these difficult times. These groundbreaking discoveries are something in which we can all take pride—even as they encourage us to look forward to even bigger breakthroughs in 2022. Happy New Year!
References:
[1] Accurate prediction of protein structures and interactions using a three-track neural network. Baek M, DiMaio F, Anishchenko I, Dauparas J, Grishin NV, Adams PD, Read RJ, Baker D., et al. Science. 2021 Jul 15:eabj8754.
[2] Highly accurate protein structure prediction with AlphaFold. Jumper J, Evans R, Pritzel A, Green T, Senior AW, Kavukcuoglu K, Kohli P, Hassabis D. et al. Nature. 2021 Jul 15.
[3] Structural insights of SARS-CoV-2 spike protein from Delta and Omicron variants. Sadek A, Zaha D, Ahmed MS. preprint bioRxiv. 2021 Dec 9.
[5] Pfizer’s novel COVID-19 oral antiviral treatment candidate reduced risk of hospitalization or death by 89% in interim analysis of phase 2/3 EPIC-HR Study. Pfizer. 5 November 52021.
[6] Coronavirus (COVID-19) Update: FDA authorizes first oral antiviral for treatment of COVID-19. Food and Drug Administration. 22 Dec 2021.
[7] Coronavirus (COVID-19) Update: FDA authorizes additional oral antiviral for treatment of COVID-19 in certain adults. Food and Drug Administration. 23 Dec 2021.
[8] 4′-Fluorouridine is an oral antiviral that blocks respiratory syncytial virus and SARS-CoV-2 replication. Sourimant J, Lieber CM, Aggarwal M, Cox RM, Wolf JD, Yoon JJ, Toots M, Ye C, Sticher Z, Kolykhalov AA, Martinez-Sobrido L, Bluemling GR, Natchus MG, Painter GR, Plemper RK. Science. 2021 Dec 2.
[9] Anti-SARS-CoV-2 monoclonal antibodies. NIH COVID-19 Treatment Guidelines. 16 Dec 2021.
[10] CRISPR-Cas9 in vivo gene editing for transthyretin amyloidosis. Gillmore JD, Gane E, Taubel J, Kao J, Fontana M, Maitland ML, Seitzer J, O’Connell D, Walsh KR, Wood K, Phillips J, Xu Y, Amaral A, Boyd AP, Cehelsky JE, McKee MD, Schiermeier A, Harari O, Murphy A, Kyratsous CA, Zambrowicz B, Soltys R, Gutstein DE, Leonard J, Sepp-Lorenzino L, Lebwohl D. N Engl J Med. 2021 Aug 5;385(6):493-502.
[11] Editas Medicine announces positive initial clinical data from ongoing phase 1/2 BRILLIANCE clinical trial of EDIT-101 For LCA10. Editas Medicine. 29 Sept 2021.
Links:
Structural Biology (National Institute of General Medical Sciences/NIH)
The Structures of Life (NIGMS)
COVID-19 Research (NIH)
2021 Science Breakthrough of the Year (American Association for the Advancement of Science, Washington, D.C)
U.S. Surgeon General on Emotional Well-Being and Fighting the Opioid Epidemic
Posted on by Dr. Francis Collins
From September 2019 to September 2020, the Centers for Disease Control and Prevention reported nearly 90,000 overdose deaths in the United States. These latest data on the nation’s opioid crisis offer another stark reminder that help is desperately needed in communities across the land. NIH’s research efforts to address the opioid crisis have been stressed during the pandemic, but creative investigators have come up with workarounds like wider use of telemedicine to fill the gap.
Much of NIH’s work on the opioid crisis is supported by the Helping to End Addiction Long-term (HEAL) Initiative. Recently, the more-than 500 investigators supported by HEAL came together virtually for their second annual meeting to discuss the initiative’s latest research progress and challenges.
As part of the meeting, I had a conversation with Dr. Vivek Murthy, the U.S. Surgeon General. Dr. Murthy served as the 19th U.S. Surgeon General under the Obama Administration and was recently confirmed as the 21st Surgeon General under the Biden Administration. In his first term as America’s Doctor, in which I had the privilege of working with him, Dr. Murthy created initiatives to tackle our country’s most urgent public health issues, including addiction and the opioid crisis. He also issued the nation’s first Surgeon General’s Report on addiction, presenting the latest scientific data and issuing a call to action to recognize addiction as a chronic illness—and not a moral failing.
In 2016, Dr. Murthy sent a letter to 2.3 million healthcare professionals urging them to join a movement to tackle the opioid epidemic. This was the first time in the history of the office that a Surgeon General had issued a letter calling the medical profession to action on this issue. In 2017, Dr. Murthy focused his attention on chronic stress and isolation as prevalent problems with profound implications for health, productivity, and happiness.
Our conversation during the HEAL meeting took place via videoconference, with the Surgeon General connecting from Washington, D.C., and me linking in from my home in Maryland. Here’s a condensed transcript of our chat:
Collins: Welcome, Dr. Murthy. We’ve known each other for a few years, and I know that you’ve talked extensively about the national epidemic of loneliness. What have you learned about loneliness and how it affects our emotional wellbeing?
Murthy: Thanks, Francis. Loneliness and perceived social isolation are profound challenges for communities struggling with addiction, including opioid use disorders. I had no real background in these issues when I started as Surgeon General in 2014. I was educated by people I met all across the country, who in their own way would tell me their stories of isolation and loneliness. It’s a common stressor, especially for those who struggle with opioid use disorders. Stress can be a trigger for relapse. It’s also connected with overdose attempts and overdose deaths.
But loneliness is bigger than addiction. It is not just a bad feeling. Loneliness increases our risk of anxiety and depression, dementia, cardiac disease, and a host of other conditions. However you cut it, addressing social isolation and loneliness is an important public-health issue if we care about addiction, if we care about mental health—if we care about the physical wellbeing of people in our country.
Collins: Vivek, you made the diagnosis of an epidemic of American loneliness back before COVID-19 came along. With the emergence of COVID-19 a little more than a year ago, it caused us to isolate ourselves even more. Now that you’re back as Surgeon General and seeing the consequences of the worst pandemic in 103 years, is loneliness even worse now than before the pandemic?
Murthy: I think there are many people for whom that sense of isolation and loneliness has increased during the pandemic. But the pandemic has been a very heterogenous experience. There are some people who have found themselves more surrounded by their extended family or a close set of friends. That has been, in many ways, a luxury. For many people who are on the frontlines as essential workers, whose jobs don’t permit them to just pick up and leave and visit extended family, these have been very stressful and isolating times.
So, I am worried. And I’m particularly worried about young people—adolescents and young adults. They already had high rates of depression, anxiety, and suicide before the pandemic, and they’re now struggling with loneliness. I mention this because young people are so hyperconnected by technology, they seem to be on TikTok and Instagram all the time. They seem to be chatting with their friends constantly, texting all the time. How could they feel isolated or lonely?
But one of the things that has become increasingly clear is what matters when it comes to loneliness is the quality of your human connections, not the quantity. For many young people that I spoke to while traveling across the country, they would say that, yes, we’re connected to people all the time. But we don’t necessarily feel like we can always be ourselves in our social media environment. That’s where comparison culture is at its height. That’s where we feel like our lives are always falling short, whether it’s not having a fancy enough job, not having as many friends, or not having the right clothing or other accessories.
We talk a lot about resilience in our country. But how do we develop more resilient people? One of the keys is to recognize that social connections are an important source of resilience. They are our natural buffers for stress. When hard things happen in our lives, so many of us just instinctively will pick up the phone to call a friend. Or we’ll get into the car and go visit a member of our family or church. The truth is, if we want to build a society that’s healthier mentally and physically, that is more resilient, and that is also more happy and fulfilled, we have to think about how we build a society that is more centered around human connection and around relationships.
My hope is that one of the things we will reevaluate is building a people-centered society. That means designing workplaces that allow people to prioritize relationships. It means designing schools that equip our children with social and emotional learning tools to build healthy relationships from the earliest ages. It means thinking about public policy, not from just the standpoint of financial impact but in terms of how it impacts communities and how it can fracture communities.
We have an opportunity to do that now, but it won’t happen by default. We have to think through this very proactively, and it starts with our own lives. What does it mean for each of us to live a truly people-centered life? What decisions would we make differently about work, about how we spend time, about where we put our attention and energy?
Collins: Those are profound and very personal words that I think we can all relate to. Let me ask you about another vulnerable population that we care deeply about. There are 50 million Americans who are living with chronic pain, invisible to many, especially during the pandemic, for whom being even more isolated has been particularly rough—and who are perhaps in a circumstance where getting access to medical care has been challenging. As Surgeon General, are you also looking closely at the folks with chronic pain?
Murthy: You’re right, the populations that were more vulnerable pre-pandemic have really struggled during this pandemic—whether that’s getting medications for treatment, needed counseling services, or taking part in social support groups, which are an essential part of the overall treatment approach and staying in recovery. It’s a reminder of how urgent it is for us, number one, to improve access to healthcare in our country. We’ve made huge strides in this area, but millions are still out of reach of the healthcare system.
A potential silver lining of this pandemic is telemedicine, which has extraordinary potential to improve and extend access to services for people living with substance use disorders. In 2016, I remember visiting a small Alaskan fishing village that you can only get to by boat or plane. In that tiny village of 150 people, I walked into the small cabin where they had first-aid supplies and provided some basic medical care. There I saw a small monitor mounted on the wall and a chair. They told me that the monitor is where people, if they’re dealing with a substance use disorder, come and sit to get counseling services from people in the lower 48 states. I was so struck by that. To know that telemedicine could reach this remote Alaskan village was really extraordinary.
I think the pandemic has accelerated our adoption of telemedicine by perhaps five years or more. But we must sustain this momentum not only with investment in broadband infrastructure, but with other things that seem mundane, like the reimbursement structure around telemedicine. I talk to clinicians now who say they are seeing some private insurers go back on reimbursement for telemedicine because the pandemic is starting to get better. But the lesson learned is not that telemedicine should go away; it’s that we should be integrating it even more deeply into the practice of medicine.
The future of care, I believe, is bringing care closer to where people are, integrating it into their workflow, bringing it to their homes and their neighborhoods. I saw this so clearly for many of the patients I cared for who fell into that category of being in vulnerable populations. They were working two, three jobs, trying to take care of their children at the same time. Having a conversation with them about how they could find time to go to the gym was almost a laughable matter because they were literally dealing with issues of survival and putting food on the table for their kids. As a society we have to do more to understand the lives of people who fall into those categories and provide services that bring what they need to them, as opposed to expecting them to come to us.
If we continue in a purely fee-for-service-based environment where people must go multiple places to get their care, we will not ultimately get care to the vulnerable populations that have struggled the most and that are hoping that we will do better this time around. I think we can. I think we must. And I think COVID may just be, in part, the impetus to move forward in a different way that we need.
Collins: Let’s talk a minute about the specifics of the opioid crisis. If we’re going to move this crisis in the right direction, are there particular areas that you would say we really need more rigorous data in order to convince the medical care system—both the practitioners and the people deciding about reimbursement—that these are things we must do?
Murthy: There are a few areas that come to mind, and I’ve jotted them down. It is so important for us to do research with vulnerable populations, recognizing they often get left out. It’s essential that we conduct studies specifically for these populations so that we can better target interventions to them.
The second area is prevention programs. People want to prevent illnesses. I have not met anybody anywhere in the United States who has said, “I’d rather get diabetes first and treat it versus prevent it in the first place.” As silly as that might sound, it is the exact opposite of how we finance health interventions in our country. We put the lion’s share of our dollars in treatment. We do very little in prevention.
The third piece is the barriers faced by primary-care clinicians, who we want to be at the heart of providing a lot of these treatment services. I’ll tell you, just from my conversations with primary-care docs around the country, they worry about not having enough for their patients in the way of social work and social support services in their offices.
Finally, it has become extraordinarily clear to me that social support is one of the critical elements of treatment for substance use disorders. That it is what helps keep people in recovery. I think about the fact that many people I met who struggle with opioid use disorders had family members who were wondering how they could be helpful. They weren’t sure. They said, “Should I just keep badgering my relative to go to treatment? Should I take a tough love approach? What should I do to be helpful?”
This actually is one of the most pressing issues: social support is most often going to come from family, from friends, and from other community members. So, being able to guide them in an evidence-based way about what measures, what forms actually can be helpful to people struggling with opioid use disorders could also be immensely helpful to a group that is looking to provide assistance and support, but often is struggling to figure out how best to do that.
Collins: Vivek, you were focused as Surgeon General in the Obama Administration on the importance of changing how America thinks about addiction—that it is not a moral failing but a chronic illness that has to be treated with compassion, urgency, skill, and medical intervention. Are we getting anywhere with making that case?
Murthy: Sometimes people shy away from addressing the stigma around addiction because it feels too hard to address. But it is one of the most important issues to address. If people are still feeling judged for their disorders, they are not going to feel comfortable coming forward and getting treatment. And others will hesitate to step up and provide support.
I will always remember the young couple I met in Oklahoma who had lost their son to an opioid overdose. They told me that previously in their life whenever they had a struggle—a job loss or other health issue in the family—neighbors would come over, they would drop off food, they would visit and sit with them in their living room and hold their hands to see if they were okay. When their son died after opioid use disorder, it was silent. Nobody came over. It’s a very common story of how people feel ashamed, they feel uncomfortable, they don’t know quite what to say. So they stay away, which is the worst thing possible during these times of great pain and distress.
I do think we have made progress in the last few years. There are more people stepping forward to tell their stories. There are more people and practitioners who are embracing the importance of talking to their patients about substance use disorders and getting involved in treating them. But the truth is, we still have many people in the country who feel ashamed of what they’re dealing with. We still have many family members who feel that this is a source of shame to have a loved one struggling with a substance use disorder.
To me, this is much bigger than substance use disorders. This is a broader cultural issue of how we think about strength and vulnerability. We have defined strength in modern society as the loudest voice in the room or the person with the most physical prowess, the person who’s aggressive in negotiations, and the person who’s famous.
But I don’t think that’s what strength really is. Strength is so often displayed in moments of vulnerability when people have the courage to open up and be themselves. Strength is defined by the people who have the courage to display love, patience, and compassion, especially when it’s difficult. That’s what real strength is.
One of my hopes is that, as a society, we can ultimately redefine strength. As we think about our children and what we want them to be, we cannot aspire for them to be the loudest voice in the room. We can aspire for them to be the most-thoughtful, the most-welcoming, the most-inviting, the most-compassionate voice in the room.
If we truly want to be a society that’s grounded in love, compassion, and kindness, if we truly recognize those as the sources of strength and healing, we have to value those in our workplaces. They have to be reflected in our promotion systems. We have to value them in the classroom. Ultimately, we’ve got to build our lives around them.
That is a broader lesson that I took from all of the conversations I’ve had with people who struggle with opioid use disorders. What I took was, yes, we need medication and assisted treatment; yes, we need counseling services; yes, we need social services and wraparound services and recovery services. But the engine that will drive our healing is fundamentally the love and compassion that come from human relationships.
We all have the ability to heal because we all have the ability to be kind and to love one another. That’s the lesson that it took me more than two decades to learn in medicine. More important than any prescription that I could write is the compassion that I could extend to patients simply by listening, by showing up, by being present in their lives. We all have that ability, regardless of what degrees follow our name.
Collins: Vivek, this has been a wonderful conversation. We are fortunate to have you as our Surgeon General at this time, when we need lots of love and compassion.
Murthy: Thank you so much, Francis.
Links:
Opioids (National Institute on Drug Abuse/NIH)
Opioid Overdose Crisis (NIDA)
Vice Admiral Vivek H. Murthy (U.S. Department of Health and Human Services, Washington, D.C.)
Helping to End Addiction Long-term (HEAL) Initiative (NIH)
Video: Emotional Well Being and the Power of Connections to Fight the Opioid Epidemic (HEAL/NIH)
Could CRISPR Gene-Editing Technology Be an Answer to Chronic Pain?
Posted on by Dr. Francis Collins
Gene editing has shown great promise as a non-heritable way to treat a wide range of conditions, including many genetic diseases and more recently, even COVID-19. But could a version of the CRISPR gene-editing tool also help deliver long-lasting pain relief without the risk of addiction associated with prescription opioid drugs?
In work recently published in the journal Science Translational Medicine, researchers demonstrated in mice that a modified version of the CRISPR system can be used to “turn off” a gene in critical neurons to block the transmission of pain signals [1]. While much more study is needed and the approach is still far from being tested in people, the findings suggest that this new CRISPR-based strategy could form the basis for a whole new way to manage chronic pain.
This novel approach to treating chronic pain occurred to Ana Moreno, the study’s first author, when she was a Ph.D. student in the NIH-supported lab of Prashant Mali, University of California, San Diego. Mali had been studying a wide range of novel gene- and cell-based therapeutics. While reading up on both, Moreno landed on a paper about a mutation in a gene that encodes a pain-enhancing protein in spinal neurons called NaV1.7.
Moreno read that kids born with a loss-of-function mutation in this gene have a rare condition known as congenital insensitivity to pain (CIP). They literally don’t sense and respond to pain. Although these children often fail to recognize serious injuries because of the absence of pain to alert them, they have no other noticeable physical effects of the condition.
For Moreno, something clicked. What if it were possible to engineer a new kind of treatment—one designed to turn this gene down or fully off and stop people from feeling chronic pain?
Moreno also had an idea about how to do it. She’d been working on repressing or “turning off” genes using a version of CRISPR known as “dead” Cas9 [2]. In CRISPR systems designed to edit DNA, the Cas9 enzyme is often likened to a pair of scissors. Its job is to cut DNA in just the right spot with the help of an RNA guide. However, CRISPR-dead Cas9 no longer has any ability to cut DNA. It simply sticks to its gene target and blocks its expression. Another advantage is that the system won’t lead to any permanent DNA changes, since any treatment based on CRISPR-dead Cas9 might be safely reversed.
After establishing that the technique worked in cells, Moreno and colleagues moved to studies of laboratory mice. They injected viral vectors carrying the CRISPR treatment into mice with different types of chronic pain, including inflammatory and chemotherapy-induced pain.
Moreno and colleagues determined that all the mice showed evidence of durable pain relief. Remarkably, the treatment also lasted for three months or more and, importantly, without any signs of side effects. The researchers are also exploring another approach to do the same thing using a different set of editing tools called zinc finger nucleases (ZFNs).
The researchers say that one of these approaches might one day work for people with a large number of chronic pain conditions that involve transmission of the pain signal through NaV1.7. That includes diabetic polyneuropathy, sciatica, and osteoarthritis. It also could provide relief for patients undergoing chemotherapy, along with those suffering from many other conditions. Moreno and Mali have co-founded the spinoff company Navega Therapeutics, San Diego, CA, to work on the preclinical steps necessary to help move their approach closer to the clinic.
Chronic pain is a devastating public health problem. While opioids are effective for acute pain, they can do more harm than good for many chronic pain conditions, and they are responsible for a nationwide crisis of addiction and drug overdose deaths [3]. We cannot solve any of these problems without finding new ways to treat chronic pain. As we look to the future, it’s hopeful that innovative new therapeutics such as this gene-editing system could one day help to bring much needed relief.
References:
[1] Long-lasting analgesia via targeted in situ repression of NaV1.7 in mice. Moreno AM, Alemán F, Catroli GF, Hunt M, Hu M, Dailamy A, Pla A, Woller SA, Palmer N, Parekh U, McDonald D, Roberts AJ, Goodwill V, Dryden I, Hevner RF, Delay L, Gonçalves Dos Santos G, Yaksh TL, Mali P. Sci Transl Med. 2021 Mar 10;13(584):eaay9056.
[2] Nuclease dead Cas9 is a programmable roadblock for DNA replication. Whinn KS, Kaur G, Lewis JS, Schauer GD, Mueller SH, Jergic S, Maynard H, Gan ZY, Naganbabu M, Bruchez MP, O’Donnell ME, Dixon NE, van Oijen AM, Ghodke H. Sci Rep. 2019 Sep 16;9(1):13292.
[3] Drug Overdose Deaths. Centers for Disease Control and Prevention.
Links:
Congenital insensitivity to pain (National Center for Advancing Translational Sciences/NIH)
Opioids (National Institute on Drug Abuse/NIH)
Mali Lab (University of California, San Diego)
Navega Therapeutics (San Diego, CA)
NIH Support: National Human Genome Research Institute; National Cancer Institute; National Institute of General Medical Sciences; National Institute of Neurological Disorders and Stroke
The Amazing Brain: Deep Brain Stimulation
Posted on by Dr. Francis Collins
August is here, and many folks have plans to enjoy a well-deserved vacation this month. I thought you might enjoy taking a closer look during August at the wonder and beauty of the brain here on my blog, even while giving your own brains a rest from some of the usual work and deadlines.
Some of the best imagery—and best science—comes from the NIH-led Brain Research through Advancing Innovative Neurotechnologies® (BRAIN) Initiative, a pioneering project aimed at revolutionizing our understanding of the human brain. Recently, the BRAIN Initiative held a “Show Us Your Brain Contest!”, which invited researchers involved in the effort to submit their coolest images. So, throughout this month, I’ve decided to showcase a few of these award-winning visuals.
Let’s start with the first-place winner in the still-image category. What you see above is an artistic rendering of deep brain stimulation (DBS), an approach now under clinical investigation to treat cognitive impairment that can arise after a traumatic brain injury and other conditions.
The vertical lines represent wire leads with a single electrode that has been inserted deep within the brain to reach a region involved in cognition, the central thalamus. The leads are connected to a pacemaker-like device that has been implanted in a patient’s chest (not shown). When prompted by the pacemaker, the leads’ electrode emits electrical impulses that stimulate a network of neuronal fibers (blue-white streaks) involved in arousal, which is an essential component of human consciousness. The hope is that DBS will improve attention and reduce fatigue in people with serious brain injuries that are not treatable by other means.
Andrew Janson, who is a graduate student in Christopher Butson’s NIH-supported lab at the Scientific Computing and Imaging Institute, University of Utah, Salt Lake City, composed this image using a software program called Blender. It’s an open-source, 3D computer graphics program often used to create animated films or video games, but not typically used in biomedical research. That didn’t stop Janson.
With the consent of a woman preparing to undergo experimental DBS treatment for a serious brain injury suffered years before in a car accident, Janson used Blender to transform her clinical brain scans into a 3D representation of her brain and the neurostimulation process. Then, he used a virtual “camera” within Blender to capture the 2D rendering you see here. Janson plans to use such imagery, along with other patient-specific modeling and bioelectric fields simulations, to develop a virtual brain stimulation surgery to predict the activation of specific fiber pathways, depending upon lead location and stimulation settings.
DBS has been used for many years to relieve motor symptoms of certain movement disorders, including Parkinson’s disease and essential tremor. More recent experimental applications include this one for traumatic brain injury, and others for depression, addiction, Alzheimer’s disease, and chronic pain. As the BRAIN Initiative continues to map out the brain’s complex workings in unprecedented detail, it will be exciting to see how such information can lead to even more effective applications of to DBS to help people living with a wide range of neurological conditions.
Links:
Deep Brain Stimulation for Movement Disorders (National Institute of Neurological Disorders and Stroke/NIH)
Video: Deep Brain Stimulation (University of Utah, Salt Lake City)
Deep Brain Stimulation for the Treatment of Parkinson’s Disease and Other Movement Disorders (NINDS/NIH)
Butson Lab (University of Utah)
Show Us Your Brain! (BRAIN Initiative/NIH)
Brain Research through Advancing Innovative Neurotechnologies® (BRAIN) Initiative (NIH)
NIH Support: National Institute of Neurological Disorders and Stroke
Discovering a Source of Laughter in the Brain
Posted on by Dr. Francis Collins
If laughter really is the best medicine, wouldn’t it be great if we could learn more about what goes on in the brain when we laugh? Neuroscientists recently made some major progress on this front by pinpointing a part of the brain that, when stimulated, never fails to induce smiles and laughter.
In their study conducted in three patients undergoing electrical stimulation brain mapping as part of epilepsy treatment, the NIH-funded team found that stimulation of a specific tract of neural fibers, called the cingulum bundle, triggered laughter, smiles, and a sense of calm. Not only do the findings shed new light on the biology of laughter, researchers hope they may also lead to new strategies for treating a range of conditions, including anxiety, depression, and chronic pain.
In people with epilepsy whose seizures are poorly controlled with medication, surgery to remove seizure-inducing brain tissue sometimes helps. People awaiting such surgeries must first undergo a procedure known as intracranial electroencephalography (iEEG). This involves temporarily placing 10 to 20 arrays of tiny electrodes in the brain for up to several weeks, in order to pinpoint the source of a patient’s seizures in the brain. With the patient’s permission, those electrodes can also enable physician-researchers to stimulate various regions of the patient’s brain to map their functions and make potentially new and unexpected discoveries.
In the new study, published in The Journal of Clinical Investigation, Jon T. Willie, Kelly Bijanki, and their colleagues at Emory University School of Medicine, Atlanta, looked at a 23-year-old undergoing iEEG for 8 weeks in preparation for surgery to treat her uncontrolled epilepsy [1]. One of the electrodes implanted in her brain was located within the cingulum bundle and, when that area was stimulated for research purposes, the woman experienced an uncontrollable urge to laugh. Not only was the woman given to smiles and giggles, she also reported feeling relaxed and calm.
As a further and more objective test of her mood, the researchers asked the woman to interpret the expression of faces on a computer screen as happy, sad, or neutral. Electrical stimulation to the cingulum bundle led her to see those faces as happier, a sign of a generally more positive mood. A full evaluation of her mental state also showed she was fully aware and alert.
To confirm the findings, the researchers looked to two other patients, a 40-year-old man and a 28-year-old woman, both undergoing iEEG in the course of epilepsy treatment. In those two volunteers, stimulation of the cingulum bundle also triggered laughter and reduced anxiety with otherwise normal cognition.
Willie notes that the cingulum bundle links many brain areas together. He likens it to a super highway with lots of on and off ramps. He suspects the spot they’ve uncovered lies at a key intersection, providing access to various brain networks regulating mood, emotion, and social interaction.
Previous research has shown that stimulation of other parts of the brain can also prompt patients to laugh. However, what makes stimulation of the cingulum bundle a particularly promising approach is that it not only triggers laughter, but also reduces anxiety.
The new findings suggest that stimulation of the cingulum bundle may be useful for calming patients’ anxieties during neurosurgeries in which they must remain awake. In fact, Willie’s team did so during their 23-year-old woman’s subsequent epilepsy surgery. Each time she became distressed, the stimulation provided immediate relief. Also, if traditional deep brain stimulation or less invasive means of brain stimulation can be developed and found to be safe for long-term use, they may offer new ways to treat depression, anxiety disorders, and/or chronic pain.
Meanwhile, Willie’s team is hard at work using similar approaches to map brain areas involved in other aspects of mood, including fear, sadness, and anxiety. Together with the multidisciplinary work being mounted by the NIH-led BRAIN Initiative, these kinds of studies promise to reveal functionalities of the human brain that have previously been out of reach, with profound consequences for neuroscience and human medicine.
Reference:
[1] Cingulum stimulation enhances positive affect and anxiolysis to facilitate awake craniotomy. Bijanki KR, Manns JR, Inman CS, Choi KS, Harati S, Pedersen NP, Drane DL, Waters AC, Fasano RE, Mayberg HS, Willie JT. J Clin Invest. 2018 Dec 27.
Links:
Video: Patient’s Response (Bijanki et al. The Journal of Clinical Investigation)
Epilepsy Information Page (National Institute of Neurological Disease and Stroke/NIH)
Jon T. Willie (Emory University, Atlanta, GA)
NIH Support: National Institute of Neurological Disease and Stroke; National Center for Advancing Translational Sciences
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