{"id":7054,"date":"2014-11-19T17:42:20","date_gmt":"2014-11-19T20:42:20","guid":{"rendered":"http:\/\/scienceblogs.com.br\/hypercubic\/?p=7054"},"modified":"2014-11-19T17:42:20","modified_gmt":"2014-11-19T20:42:20","slug":"neur-o-metr-neural","status":"publish","type":"post","link":"https:\/\/www.blogs.unicamp.br\/hypercubic\/2014\/11\/neur-o-metr-neural\/","title":{"rendered":"Neur\u00f4, o metr\u00f4 neural"},"content":{"rendered":"<figure style=\"width: 563px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/scienceblogs.com.br\/hypercubic\/files\/2014\/11\/neur\u00f4.png\" data-rel=\"lightbox-image-0\" data-rl_title=\"\" data-rl_caption=\"\"><img fetchpriority=\"high\" decoding=\"async\" style=\"padding-top: 0px;padding-left: 0px;padding-right: 0px;border-width: 0px\" title=\"\" src=\"http:\/\/scienceblogs.com.br\/hypercubic\/files\/2014\/11\/image_thumb3.png\" alt=\"neur\u00f4\" width=\"563\" height=\"292\" border=\"0\" \/><\/a><figcaption class=\"wp-caption-text\">Flagrante microsc\u00f3pico de um neur\u00f4nio tomando um neur\u00f4, isto \u00e9, lan\u00e7ando um ax\u00f4nio atrav\u00e9s de um microtubo. [Imagem: Xiuling Li\/University of Illinois]<\/figcaption><\/figure>\n<p align=\"justify\">Linhas de metr\u00f4 e redes de neur\u00f4nios t\u00eam muitas coisas em comum. Ambos os sistemas s\u00e3o complexos, caros, exigem conex\u00f5es delicadas e crescem de modo lento e subterr\u00e2neo. Sim, neur\u00f4nios tamb\u00e9m crescem em t\u00faneis e pesquisadores da Universidade de Illinois e da Universidade de Winsconsin est\u00e3o usando microtubos para replicar esse ambiente sob o microsc\u00f3pio. Rec\u00e9m-descoberta, a t\u00e9cnica permite n\u00e3o s\u00f3 a observa\u00e7\u00e3o direta do crescimento neuronal, mas vai facilitar o estudo das redes neurais e pode at\u00e9 acelerar e guiar o crescimento de neur\u00f4nios para repara\u00e7\u00e3o de danos.<\/p>\n<p><!--more--><\/p>\n<p align=\"justify\">\n<p align=\"justify\">Durante muito tempo, os cientistas pensaram que os neur\u00f4nios n\u00e3o cresciam nem se reproduziam no c\u00e9rebro. Assim, pensava-se que o n\u00famero de neur\u00f4nios simplesmente ia caindo ao longo da vida, com a consequente queda das fun\u00e7\u00f5es cerebrais. Na \u00faltima d\u00e9cada, diversas pesquisas revelaram que n\u00e3o \u00e9 bem assim. Apesar de observado, esse crescimento neuronal ainda n\u00e3o foi reproduzido no laborat\u00f3rio da maneira exata como ocorre no c\u00e9rebro.<\/p>\n<h3 align=\"justify\"><strong>Entrando pelo cano<\/strong><\/h3>\n<p align=\"justify\">O motivo \u00e9 simples: neur\u00f4nios n\u00e3o gostam das placas de vidro, com sua planura chata e fria. Sentem-se mais \u00e0 vontade em ambientes macios e aconchegantes, como o interior do c\u00e9rebro. T\u00e9cnicas anteriores tentaram reproduzir esse ambiente cerebral usando canais escavados em placas de vidro ou outros materiais s\u00f3lidos, mas nesse caso as c\u00e9lulas nervosas ficam, digamos, nervosas e se comportam de maneira distinta do que acontece no corpo. N\u00e3o \u00e9 algo muito \u00fatil para o estudo <em>in-vivo<\/em>. Nem muito pr\u00e1tico, no caso dos substratos s\u00f3lidos e opacos, que impossibilitam a observa\u00e7\u00e3o microsc\u00f3pica.<\/p>\n<p align=\"justify\">Usar microtubos transparentes por onde os neur\u00f4nios possam crescer de maneira guiada parece a solu\u00e7\u00e3o perfeita. A ideia veio de um professor de Engenharia El\u00e9trica e Engenharia da Computa\u00e7\u00e3o da Universidade de Illinois em Urbana-Champaign: Xiuling Li. Co-autor do estudo com o professor Justin Williams, da Universidade de Winsconsin em Madison, o prof. Li define os microtubos como uma poderosa plataforma tridimensional para a cultura neural, que permite acelerar e medir o processo de crescimento dos neur\u00f4nios. Outro autor do estudo \u00e9 Paul Froeter, graduando da Universidade de Illinois. Foi Froeter quem descobriu os microtubos de material transparente que podem ser usados nas placas de microsc\u00f3pio e permitir a observa\u00e7\u00e3o.<\/p>\n<h3 align=\"justify\"><strong>Tomando o neur\u00f4<\/strong><\/h3>\n<p align=\"justify\">Em artigo publicado online em 20\/10 no site da revista <em>American Chemical Society Nano<\/em>, a equipe descreve a t\u00e9cnica do microtubo, os resultados das primeiras observa\u00e7\u00f5es e prop\u00f5e seus usos. A t\u00e9cnica usa uma rede de microtubos formados por membranas fin\u00edssimas de <a href=\"http:\/\/pt.wikipedia.org\/wiki\/Nitreto_de_sil%C3%ADcio\" target=\"_blank\" rel=\"noopener noreferrer\">nitreto de sil\u00edcio<\/a> (SiNx). Essas membranas de cer\u00e2mica s\u00e3o enroladas facilmente em tubos de dimens\u00f5es precisas e transl\u00facidos. Esses microtubos j\u00e1 eram usados para fins eletr\u00f4nicos no laborat\u00f3rio do Prof. Li, em aplica\u00e7\u00f5es como indutores 3D. Na aplica\u00e7\u00e3o neuronal, os tubinhos t\u00eam o tamanho aproximado de um neur\u00f4nio, podem ser longos como um fio de cabelo e foram separados por intervalos iguais ao seu comprimento.<\/p>\n<p align=\"justify\">As primeiras observa\u00e7\u00f5es foram promissoras. Li e seus colaboradores confirmaram uma de suas hip\u00f3teses: os ax\u00f4nios n\u00e3o s\u00f3 crescem em t\u00faneis como crescem mais depressa dentro deles. A acelera\u00e7\u00e3o dentro do microtubo foi at\u00e9 20 vezes maior do que no espa\u00e7o entre dois t\u00faneis. \u00c9 como se fosse um neur\u00f4, um metr\u00f4 de neur\u00f4nio. No <em>time-lapse<\/em> a seguir, \u00e9 poss\u00edvel observar como a c\u00e9lula nervosa \u201canda\u201d mais r\u00e1pido quando toma o t\u00fanel formado pelo microtubo:<\/p>\n<figure style=\"width: 371px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/scienceblogs.com.br\/hypercubic\/files\/2014\/11\/neur\u00f42.png\" data-rel=\"lightbox-image-1\" data-rl_title=\"\" data-rl_caption=\"\"><img decoding=\"async\" style=\"float: none;padding-top: 0px;padding-left: 0px;margin-left: auto;padding-right: 0px;margin-right: auto;border-width: 0px\" title=\"\" src=\"http:\/\/scienceblogs.com.br\/hypercubic\/files\/2014\/11\/image_thumb4.png\" alt=\"neur\u00f4\" width=\"371\" height=\"455\" border=\"0\" \/><\/a><figcaption class=\"wp-caption-text\">[Imagem: Xiuling Li\/University of Illinois]<\/figcaption><\/figure>\n<p align=\"justify\">A curto prazo, Li <em>et al.<\/em> buscam aperfei\u00e7oar os microtubos. Entre os planos, est\u00e1 o desenvolvimento de vers\u00f5es dos tubos com eletrodos, o que permitiria a medi\u00e7\u00e3o direta dos sinais el\u00e9tricos transmitidos pelos ax\u00f4nios, inclusive durante seu crescimento. A longo prazo, um dos objetivos dos pesquisadores \u00e9 que os microtubos possam ter um uso terap\u00eautico: eles poderiam ser implantados como infra-estrutura em \u00e1reas com danos neurais para promover a regenera\u00e7\u00e3o controlada dos neur\u00f4nios, refazendo as redes e conex\u00f5es.<\/p>\n<p align=\"justify\"><strong>Refer\u00eancia<\/strong><\/p>\n<p style=\"padding-left: 30px\" align=\"justify\"><span style=\"font-family: Consolas\"><a href=\"http:\/\/scienceblogs.com.br\/hypercubic\/files\/2012\/07\/rb2_large_gray25.png\" data-rel=\"lightbox-image-2\" data-rl_title=\"\" data-rl_caption=\"\" title=\"\"><img decoding=\"async\" class=\"size-full wp-image-3123 alignleft\" src=\"http:\/\/scienceblogs.com.br\/hypercubic\/files\/2012\/07\/rb2_large_gray25.png\" alt=\"rb2_large_gray25\" width=\"70\" height=\"85\" \/><\/a>LI, X.; WILLIAMS, J.; FROETER, P. <strong>Toward Intelligent Synthetic Neural Circuits: Directing and Accelerating Neuron Cell Growth by Self-Rolled-Up Silicon Nitride Microtube Array<\/strong> [A Caminho de Circuitos Neurais Sint\u00e9ticos Inteligentes: direcionando e acelerando o crescimento de c\u00e9lulas neuronais por arranjo de microtubo de nitreto de sil\u00edcio auto-enrolado]. <em>ACS Nano<\/em>. online at <a href=\"http:\/\/pubs.acs.org\/doi\/pdf\/10.1021\/nn504876y\">pubs.acs.org\/doi\/abs\/10.1021\/nn504876y<\/a><\/span><\/p>\n<p align=\"justify\">[via <a title=\"http:\/\/phys.org\/news\/2014-11-microtubes-cozy-space-neurons-fast.html\" href=\"http:\/\/phys.org\/news\/2014-11-microtubes-cozy-space-neurons-fast.html\" target=\"_blank\" rel=\"noopener noreferrer\">phys.org<\/a>]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Linhas de metr\u00f4 e redes de neur\u00f4nios t\u00eam muitas coisas em comum. Ambos os sistemas s\u00e3o complexos, caros, exigem conex\u00f5es delicadas e crescem de modo lento e subterr\u00e2neo. Sim, neur\u00f4nios tamb\u00e9m crescem em t\u00faneis e pesquisadores da Universidade de Illinois e da Universidade de Winsconsin est\u00e3o usando microtubos para replicar esse ambiente sob o microsc\u00f3pio. [&hellip;]<\/p>\n","protected":false},"author":486,"featured_media":7062,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"_eb_attr":"","editor_plus_copied_stylings":"{}","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"material-hide-sections":[],"pgc_sgb_lightbox_settings":"","_vp_format_video_url":"","_vp_image_focal_point":[],"footnotes":""},"categories":[35,53,86,207,344,231,233,277],"tags":[405,668,1105,2250,2272,2420,3349],"class_list":["post-7054","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bioquimica-biologia","category-ciencia","category-divulgacao-cientifica","category-medicina","category-nanotecnologia","category-neurociencia-ciencia","category-neurologia-medicina","category-quimica","tag-acs-nano","tag-axonios","tag-crescimento","tag-metro","tag-microtubos","tag-neuronios","tag-tunel"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - 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