{"id":11896,"date":"2010-09-29T09:48:00","date_gmt":"2010-09-29T16:48:00","guid":{"rendered":"https:\/\/dornsife.usc.edu\/news\/stories\/sparkling-drinks-spark-pain-circuits\/"},"modified":"2023-04-19T11:22:48","modified_gmt":"2023-04-19T18:22:48","slug":"sparkling-drinks-spark-pain-circuits","status":"publish","type":"post","link":"https:\/\/dornsife.usc.edu\/news\/stories\/sparkling-drinks-spark-pain-circuits\/","title":{"rendered":"Sparkling Drinks Spark Pain Circuits"},"content":{"rendered":"\n\n\n    \n            \n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--article-hero \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--article-hero\"\n    \n      >\n\n    \n<div class=\"inner-wrapper\">\n  \n  \n  <div class=\"text-wrapper\">\n          <nav aria-label=\"Breadcrumb\" class=\"breadcrumbs\">\n        <ul>\n                      <li><a href=\"\/news\/stories\/\">News<\/a><\/li>\n                      <li><a 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visually-hidden\">Email<\/span>\n          <\/a>\n                  <\/span>\n  <\/div>\n\n  <\/div><\/div>\n  \n\n  \n    \n\n\n\n\n\n\n<div\n  class=\"cc--component-container cc--rich-text \"\n\n  \n  \n  \n  \n  \n  \n  >\n  <div class=\"c--component c--rich-text\"\n    \n      >\n\n    \n      \n<div class=\"f--field f--wysiwyg\">\n\n    \n  <p>You may not think of the fizz in soda as spicy, but your body does.<\/p>\n<p>The carbon dioxide in fizzy drinks triggers the same pain sensors in  the nasal cavity as mustard and horseradish, though at a lower  intensity, according to new research at USC.<\/p>\n<p>&ldquo;Carbonation evokes two distinct sensations,&rdquo; said Emily Liman,  senior author of a study published online in<em> <\/em>The Journal of  Neuroscience. &ldquo;It makes things sour, and it also makes them burn. We  have all felt that noxious tingling sensation when soda goes down your  throat too fast.&rdquo;<\/p>\n<p>That burning sensation comes from a system of nerves that respond to  sensations of pain, skin pressure and temperature in the nose and mouth.<\/p>\n<p>&ldquo;What we did not know was which cells and which molecules within  those cells are responsible for the painful sensation we experience when  we drink a carbonated soda,&rdquo; said Liman, associate professor of  neurobiology in USC College.<\/p>\n<p>By flowing carbonated saline onto a dish of nerve cells from the  sensory circuits in the nose and mouth, the researchers found that the  gas activated only a particular type of cell.<\/p>\n<p>&ldquo;The cells that responded to CO2 were the same cells that detect mustard,&rdquo; Liman said.<\/p>\n<p>These cells, which express a gene known as TRPA1, serve as general pain sensors.<\/p>\n<p>Cells from mice missing the TRPA1 gene showed &ldquo;a greatly reduced  response&rdquo; to carbon dioxide, Liman said, while adding the TRPA1 genetic  code to CO2-insensitive cells made them responsive to the gas.<\/p>\n<p>Now that carbonated beverages have been linked to pain circuits, some  may wonder why we consume them. A new park in Paris even features  drinking fountains that dispense free sparkling water.<\/p>\n<p>Liman cited studies going back as far as 1885 that found carbonation dramatically reduced the growth of bacteria.<\/p>\n<p>&#8220;Or it may be a macho thing,&#8221; she speculated.<\/p>\n<p>If only a sip of San Pellegrino were all it took to prove one&rsquo;s hardiness.<\/p>\n<p>The pain-sensing TRPA1 provides only one aspect of carbonation&rsquo;s  sensory experience. In 2009, a group led by Charles Zuker of the  University of California, San Diego and Nicholas Ryba of the National  Institutes of Health showed that carbonation triggers cells in the  tongue that convey sourness.<\/p>\n<p>Liman&rsquo;s collaborators were lead author Yuanyuan Wang and second  author Rui Chang, both graduate students in neurobiology in USC College.<\/p>\n<p>The National Institutes of Health funded the research.<\/p>\n\n\n\n<\/div>\n\n\n  <\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":0,"featured_media":11899,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[10],"tags":[117,1148,1793,96,745,914],"class_list":["post-11896","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-faculty","tag-biology","tag-emily-liman","tag-magazine","tag-natural-sciences","tag-neurobiology","tag-pain"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Sparkling Drinks Spark Pain Circuits<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/dornsife.usc.edu\/news\/stories\/sparkling-drinks-spark-pain-circuits\/\" \/>\n<meta property=\"og:locale\" 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