{"id":14827,"date":"2024-07-24T10:36:36","date_gmt":"2024-07-24T14:36:36","guid":{"rendered":"https:\/\/www.med.unc.edu\/cellbiophysio\/?p=14827"},"modified":"2025-02-04T10:51:55","modified_gmt":"2025-02-04T15:51:55","slug":"scientists-discover-brain-circuits-for-placebo-effect-pain-relief","status":"publish","type":"post","link":"https:\/\/www.med.unc.edu\/cellbiophysio\/scientists-discover-brain-circuits-for-placebo-effect-pain-relief\/","title":{"rendered":"Scientists discover brain circuits for placebo effect pain relief"},"content":{"rendered":"

Led by Greg Scherrer, PharmD, PhD, and Chong Chen, MD, PhD, at the UNC School of Medicine, research published in Nature reveals a new pain control pathway from the cortex to the cerebellum crucial to placebo analgesia \u2013 when the expectation of pain relief leads to pain alleviation without a therapeutic intervention, such as with a drug.<\/em><\/p>\n

\n
\"Greg
Greg Scherrer, PharmD, PhD<\/figcaption><\/figure>\n

The placebo effect is very real. This we\u2019ve known for decades, as seen in real-life observations and the best double-blinded randomized clinical trials researchers have devised for many diseases and conditions, especially pain. And yet, how and why the placebo effect occurs has remained a mystery. Now, neuroscientists have discovered a key piece of the placebo effect puzzle.<\/p>\n

Publishing in Nature<\/em><\/a>, researchers at the University of North Carolina School of Medicine \u2013 with colleagues from Stanford, the Howard Hughes Medical Institute, and the Allen Institute for Brain Science \u2013 discovered a pain control pathway that links the cingulate cortex in the front of the brain, through the pons region of the brainstem, to cerebellum in the back of the brain.<\/p>\n

The researchers, led by Greg Scherrer, PharmD, PhD<\/a>, associate professor in the UNC Department of Cell Biology and Physiology, the UNC Neuroscience Center, and the UNC Department of Pharmacology, then showed that certain neurons and synapses along this pathway are highly activated when mice expect pain relief and experience pain relief, even when there is no medication involved.<\/p>\n

\u201cThat neurons in our cerebral cortex communicate with the pons and cerebellum to adjust pain thresholds based on our expectations is both completely unexpected, given our previous understanding of the pain circuitry, and incredibly exciting,\u201d said Scherrer. \u201cOur results do open the possibility of activating this pathway through other therapeutic means, such as drugs or neurostimulation methods to treat pain.\u201d<\/p>\n

Scherrer and colleagues said research provides a new framework for investigating the brain pathways underlying other mind-body interactions and placebo effects beyond the ones involved in pain.<\/p>\n

The placebo paradox<\/strong><\/h2>\n

It is the human experience, in the face of pain, to want to feel better. As a result \u2013 and in conjunction with millennia of evolution \u2013 our brains can search for ways to help us feel better. It releases chemicals, which can be measured. Positive thinking and even prayer have been shown to benefit some patients. And the placebo effect \u2013 feeling better even though there was no \u201creal\u201d treatment \u2013 has been documented as a very real phenomenon for decades.<\/p>\n

In clinical research, the placebo effect is often seen in what we call the \u201csham\u201d treatment group. That is, individuals in this group receive a fake pill or intervention that is supposed to be inert; no one in the control group is supposed to see a benefit. Except that the brain is so powerful and individuals so desire to feel better that some experience a marked improvement in their symptoms. Some placebo effects are so strong that individuals are convinced they received a real treatment meant to help them.<\/p>\n

In fact, it\u2019s thought that some individuals in the \u201cactual\u201d treatment group also derive benefit from the placebo effect. This is one of the reasons why clinical research of therapeutics is so difficult and demands as many volunteers as possible so scientists can parse the treatment benefit from the sham. One way to help scientists do this is to first understand what precisely is happening in the brain of someone experiencing the placebo effect.<\/p>\n

Enter the Scherrer lab<\/strong><\/h2>\n

The authors of the Nature <\/em>paper knew that the scientific community\u2019s understanding of the biological underpinnings of pain relief through placebo analgesia \u2013 when the positive expectation of pain relief is sufficient for patients to feel better \u2013 came from human brain imaging studies, which showed activity in certain brain regions. Those imaging studies did not have enough precision to show what was actually happening in those brain regions. So Scherrer\u2019s team designed a set of meticulous, complementary, and time-consuming experiments to learn in more detail, with single nerve cell precision, what was happening in those regions.<\/p>\n

First, the researchers created an assay that generates in mice the expectation of pain relief and then very real placebo effect of pain relief. Then the researchers used a series of experimental methods to study the intricacies of the anterior cingulate cortex (ACC), which had been previously associated with the pain placebo effect. While mice were experiencing the effect, the scientists used genetic tagging of neurons in the ACC, imaging of calcium in neurons of freely behaving mice, single-cell RNA sequencing techniques, electrophysiological recordings, and optogenetics \u2013 the use of light and fluorescent-tagged genes to manipulate cells.<\/p>\n

These experiments helped them see and study the intricate neurobiology of the placebo effect down to the brain circuits, neurons, and synapses throughout the brain.<\/p>\n

The scientists found that when mice expected pain relief, the rostral anterior cingulate cortex neurons projected their signals to the pontine nucleus, which had no previously established function in pain or pain relief. And they found that expectation of pain relief boosted signals along this pathway.<\/p>\n

\u201cThere is an extraordinary abundance of opioid receptors here, supporting a role in pain modulation,\u201d Scherrer said. \u201cWhen we inhibited activity in this pathway, we realized we were disrupting placebo analgesia and decreasing pain thresholds. And then, in the absence of placebo conditioning, when we activated this pathway, we caused pain relief.<\/p>\n

Lastly, the scientists found that Purkinje cells \u2013 a distinct class of large branch-like cells of the cerebellum \u2013 showed activity patterns similar to those of the ACC neurons during pain relief expectation. Scherrer and first author Chong Chen, MD, PhD, a postdoctoral research associate in the Scherrer lab, said that this is cellular-level evidence for the cerebellum\u2019s role in cognitive pain modulation.<\/p>\n

\u201cWe all know we need better ways to treat chronic pain, particularly treatments without harmful side effects and addictive properties,\u201d Scherrer said. \u201cWe think our findings open the door to targeting this novel neural pain pathway to treat people in a different but potentially more effective way.\u201d<\/p>\n

This project was supported by the National Institutes of Health grants R01NS106301 and R01DA05483, the New York Stem Cell Foundation, the Stanford School of Medicine Dean\u2019s Fellowship, seed funds from Biogen, the Stanford Mind, Brain, Computation and Technology Program, and the Vannevar Bush Faculty Fellowship <\/em><\/p>\n

Other authors of this paper at the time of this research are Jesse Niehaus, Karen Huang, Alexander Barnette, Adrien Tassou, Kimberly Ritola, and Adam Hantman at the UNC School of Medicine; Fatih Dinc, and Mark Schnitzer at Stanford\/Howard Hughes Medical Institute; Andrew Shuster at Harvard; Lihua Wang and Andrew Lemire of the Howard Hughes Medical Institute Janelia Research Campus: Vilas Menon at Columbia; and Hongkui Zeng at the Allen Institute for Brain Science.<\/em><\/p>\n

\n

Written by Mark Derewicz<\/em><\/a>, 919-923-0959<\/em><\/p>\n

This article was originally published in Vital Signs on July 24, 2024. Read the article on the UNC Health Newsroom website here<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Led by Greg Scherrer, PharmD, PhD, and Chong Chen, MD, PhD, at the UNC School of Medicine, research published in Nature reveals a new pain control pathway from the cortex to the cerebellum crucial to placebo analgesia \u2013 when the expectation of pain relief leads to pain alleviation without a therapeutic intervention, such as with … Read more<\/a><\/p>\n","protected":false},"author":77299,"featured_media":11532,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"layout":"","cellInformation":"","apiCallInformation":"","footnotes":"","_links_to":"","_links_to_target":""},"categories":[52,2],"tags":[75,30],"featured-item":[],"class_list":["post-14827","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-featured-news","category-news","tag-neuroscience","tag-pain","odd"],"acf":[],"yoast_head":"\nScientists discover brain circuits for placebo effect pain relief - 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