{"id":2891,"date":"2011-01-28T14:25:00","date_gmt":"2011-01-28T19:25:00","guid":{"rendered":"https:\/\/www.med.unc.edu\/neuroscience\/1-27-11-snider-lab-publishes-in-neuro\/"},"modified":"2018-07-10T11:59:17","modified_gmt":"2018-07-10T15:59:17","slug":"1-27-11-snider-lab-publishes-in-neuro","status":"publish","type":"post","link":"https:\/\/www.med.unc.edu\/neuroscience\/1-27-11-snider-lab-publishes-in-neuro\/","title":{"rendered":"1\/28\/11: Snider Lab publishes in Neuron"},"content":{"rendered":"
\n

<\/p>\n

Researchers at the University of North Carolina at Chapel Hill have pinpointed a crucial function for a key player in the development of the nervous system. They found that this player \u2014 a protein called Erk \u2013 is necessary for nerve fibers to be wrapped with an insulating substance called myelin, which allows messages to be sent from the brain to the peripheral limbs and back again.<\/p>\n

\n
\"image2\"
In the Jan 13th issue of Neuron, Newbern et al. report that ERK1\/2 plays a vital role in Schwann cell development and myelination in vivo.<\/figcaption><\/figure>\n<\/div>\n
\n

CHAPEL HILL, NC \u2014 Researchers at the University of North Carolina at Chapel Hill have pinpointed a crucial function for a key player in the development of the nervous system. They found that this player \u2014 a protein called Erk \u2013 is necessary for nerve fibers to be wrapped with an insulating substance called myelin, which allows messages to be sent from the brain to the peripheral limbs and back again.<\/p>\n

The finding has particular importance because several neurodevelopmental disorders have recently been linked to genetic mutations in the complex developmental cascade containing Erk and its sister proteins.<\/p>\n

The UNC study, published Jan. 13, 2011, in the journal Neuron<\/a>, suggests that the effects of Erk are quite different from what previous studies done in vitro, in Petri dishes, had indicated.<\/p>\n

\u201cThese in vitro studies have been absolutely important for understanding how things work on a molecular level,\u201d said lead study author Jason M. Newbern, PhD, a postdoctoral research associate at the UNC School of Medicine<\/a>. \u201cBut when you try to say that a tiny artificial system sitting in the culture hood is going to mimic the complexity of the interactions that occur when a cell develops and wraps around a nerve fiber, as it is growing out into your limb, as your limb is growing at the same time, and as your neurons are maturing and secreting different chemicals \u2014 there is just no way you can replicate that in a dish.\u201d<\/p>\n

Close to 10,000 papers have been published on the in\u2019s and out\u2019s of this famous cascade, known to scientists as the MAP kinase pathway. Because this pathway is so complicated, finding a way to completely \u201cknock-out\u201d its critical genes in a living animal has been difficult, said senior study author William D. Snider, MD<\/a>, professor of neurology and cell and molecular physiology, and director of the UNC Neuroscience Center<\/a>.<\/p>\n

Using a number of genetic engineering tricks, the researchers were able to specifically knock-out the Erk gene during the development of the peripheral nervous system in mice. After knocking out the gene, the researchers were surprised to find that the neurons of the mutant mice appeared to be relatively unaffected.<\/p>\n

\u201cBut we did see a dramatic effect in these myelinating cells called Schwann cells, which wrap the fibers in the peripheral nervous system with myelin to allow the rapid conduction of signals,\u201d said Snider. \u201cThese cells were just devastated at every stage of development.\u201d<\/p>\n

The discovery informs the study of neurodevelopmental disorders such as neurofibromatosis, a genetic disease that affects 1 out of every 3000 people. In people with this disease, Schwann cells grow in an unregulated fashion, dotting the peripheral nerves with tumors.<\/p>\n

Now that scientists have identified close to 30 genetic mutations in the MAP kinase pathway, Newbern says that there is increasing awareness of the importance of ERK signaling to neurodevelopmental disorders.<\/p>\n

\u201cSo it provides a very compelling argument that we need to figure out what this pathway is doing in an in vivo setting, in a live animal,\u201d said Newbern.<\/p>\n

Because the cognitive defects experienced by patients with neurodevelopmental delay are more closely linked to the development of the central nervous system than to the peripheral nervous system, the researchers plan to expand their studies to see what the effects might be of losing Erk in the brain. They also want to develop models than can recapitulate what happens when this pathway is overactive, as is the case with neurofibromatosis.<\/p>\n

The research was funded by the National Institutes of Health, and a National Research Service Award to Dr. Newbern. Study co-authors from Snider\u2019s laboratory at UNC include Xiaoyan Li, research scientist; Sarah E. Shoemaker, postdoctoral research associate; Jiang Zhou, research scientist; Yaohong Wu, chief technician; Daniel Bonder, graduate student; and Steven Hollenback, technician Dr. Jian Zhong from Cornell and Dr. Gary Landreth from Case Western Reserve University School of Medicine are also co-authors.<\/p>\n

Media contact:<\/b> Les Lang, (919) 966-9366, llang@med.unc.edu <\/a><\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

<\/p>\n

Researchers at the University of North Carolina at Chapel Hill have pinpointed a crucial function for a key player in the development of the nervous system. They found that this player \u2014 a protein called Erk \u2013 is necessary for nerve fibers to be wrapped with an insulating substance called myelin, which allows messages to be sent from the brain to the peripheral limbs and back again.<\/p>\n","protected":false},"author":80868,"featured_media":2892,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[2],"tags":[],"class_list":["post-2891","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","odd"],"acf":[],"yoast_head":"\n1\/28\/11: Snider Lab publishes in Neuron | UNC Neuroscience Center<\/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:\/\/www.med.unc.edu\/neuroscience\/1-27-11-snider-lab-publishes-in-neuro\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"1\/28\/11: Snider Lab publishes in Neuron | UNC Neuroscience Center\" \/>\n<meta property=\"og:description\" content=\"Researchers at the University of North Carolina at Chapel Hill have pinpointed a crucial function for a key player in the development of the nervous system. 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