{"id":4886,"date":"2024-08-07T06:09:00","date_gmt":"2024-08-07T10:09:00","guid":{"rendered":"https:\/\/fatorrnoticias.com.br\/?p=4886"},"modified":"2024-08-04T16:24:01","modified_gmt":"2024-08-04T20:24:01","slug":"cientistas-da-usp-descobrem-area-no-cerebro-que-inativa-memorias-de-medo","status":"publish","type":"post","link":"https:\/\/fatorrnoticias.com.br\/?p=4886","title":{"rendered":"Cientistas da USP descobrem \u00e1rea no c\u00e9rebro que inativa mem\u00f3rias de medo"},"content":{"rendered":"\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/i.pinimg.com\/736x\/10\/d1\/1e\/10d11ec2a331cb7c794f3c2a4772e075.jpg\" alt=\"C\u00e9rebro humano, um holograma, um fundo escuro. | Foto Premium\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">O Sistema Nervoso alerta para poss\u00edveis amea\u00e7as com base nas experi\u00eancias de cada um, vantajoso para a sobreviv\u00eancia. Agora, pesquisadores da Universidade de S\u00e3o Paulo (USP) descobriram como inativar&nbsp;mem\u00f3rias de medo&nbsp;no c\u00e9rebro de roedores, atrav\u00e9s de uma regi\u00e3o espec\u00edfica do hipot\u00e1lamo do c\u00e9rebro.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ap\u00f3s desativar a regi\u00e3o do c\u00e9rebro relacionada \u00e0 mem\u00f3ria do medo, \u00e9 como se o animal esquecesse das experi\u00eancias passadas e se colocasse em situa\u00e7\u00f5es de risco, de forma inconsequente. Em tese, o camundongo poderia ficar parado enquanto espera&nbsp;um felino&nbsp;chegar.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">As descobertas foram publicadas na revista cient\u00edfica<em>&nbsp;Current Biology<\/em>&nbsp;e, at\u00e9 o momento, n\u00e3o foram validadas para o c\u00e9rebro humano.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Antes de come\u00e7ar os experimentos que buscam inativar ou ativar as mem\u00f3rias de medo nos animais, os pesquisadores da USP precisaram escolher qual a melhor forma de visualiza\u00e7\u00e3o das modifica\u00e7\u00f5es nesta \u00e1rea do c\u00e9rebro e optaram pela fotometria de fibra. Oficialmente, a regi\u00e3o do hipot\u00e1lamo \u00e9 conhecida como n\u00facleo pr\u00e9-mamilar dorsal (PMd).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cColocamos um v\u00edrus que expressa uma prote\u00edna sens\u00edvel \u00e0 entrada de c\u00e1lcio e pode registrar a atividade celular [dos neur\u00f4nios]. Conforme ocorre a atividade celular, vai emitindo mais fluoresc\u00eancia\u201d, explica Newton Sabino Canteras, professor do Instituto de Ci\u00eancias Biom\u00e9dicas da USP e autor do artigo, para a&nbsp;<em>Ag\u00eancia Fapesp<\/em>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Para gerar mem\u00f3rias negativas nos roedores, os cientistas colocaram as cobaias em um recipiente com duas caixas ligadas por um corredor. Quando o camundongo entrava em uma das caixas, ele recebia choques de baixa intensidade nas patas.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Como era de se esperar, o animal aprende que ele n\u00e3o deve voltar para aquele lugar, num segundo momento. \u00c9 o que ocorreu no outro dia de testes, onde o camundongo evitou retornar. Nesse momento, a \u00e1rea associada \u00e0 mem\u00f3ria do medo no c\u00e9rebro era ativada (atividade neuronal).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Com o uso de v\u00edrus programado e uma medica\u00e7\u00e3o espec\u00edfica, a equipe de cientistas conseguiu silenciar a atividade das c\u00e9lulas nessa regi\u00e3o do c\u00e9rebro dos roedores. Assim, os camundongos perderam temporariamente a capacidade de reconhecer a sala como uma amea\u00e7a (a mem\u00f3ria do medo foi suprimida).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cQuando fa\u00e7o essa inativa\u00e7\u00e3o do n\u00facleo, o animal reduz drasticamente a resposta de defesa, deixa de evitar a caixa amea\u00e7adora, vai l\u00e1 e entra, como se o ambiente fosse in\u00f3cuo,&nbsp;como se nada tivesse acontecido\u201d, detalha o professor Canteras.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8220;Nossos resultados s\u00e3o importantes para entender como os animais lidam com a imin\u00eancia cont\u00ednua de amea\u00e7a, revelando um circuito que est\u00e1 envolvido na detec\u00e7\u00e3o de amea\u00e7as e que, ao mesmo tempo, serve para atualizar o processo de mem\u00f3ria para acomodar mudan\u00e7as em condi\u00e7\u00f5es amea\u00e7adoras&#8221;, concluem os autores, no artigo.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>*Com informa\u00e7\u00f5es de Ag\u00eancia Fapesp <\/em><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pesquisadores da Universidade de S\u00e3o Paulo (USP) descobriram como inativar\u00a0mem\u00f3rias de medo\u00a0no c\u00e9rebro de roedores, atrav\u00e9s de uma regi\u00e3o espec\u00edfica do hipot\u00e1lamo do c\u00e9rebro.<\/p>\n","protected":false},"author":123457,"featured_media":4887,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24,146],"tags":[],"class_list":["post-4886","post","type-post","status-publish","format-standard","has-post-thumbnail","category-mundo","category-saude"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - 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