{"id":3960,"date":"2025-10-06T10:05:08","date_gmt":"2025-10-06T13:05:08","guid":{"rendered":"https:\/\/overticeportal.com.br\/?p=3960"},"modified":"2025-10-06T10:05:10","modified_gmt":"2025-10-06T13:05:10","slug":"nobel-de-medicina-2025-vai-para-descobertas-sobre-freio-do-sistema-imune","status":"publish","type":"post","link":"https:\/\/portalam9.com.br\/?p=3960","title":{"rendered":"Nobel de Medicina 2025 vai para descobertas sobre \u2018freio\u2019 do sistema imune"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><em>Tempo de leitura: 4 minutos<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O\u00a0Nobel\u00a0de Fisiologia ou Medicina de 2025 foi concedido a\u00a0<strong>Mary E. Brunkow<\/strong>,\u00a0<strong>Fred Ramsdell<\/strong>\u00a0e\u00a0<strong>Shimon Sakaguchi\u00a0<\/strong>nesta segunda-feira (06). Os tr\u00eas cientistas s\u00e3o reconhecidos por descobertas que explicam como o sistema imunol\u00f3gico consegue se defender de\u00a0v\u00edrus\u00a0e\u00a0bact\u00e9rias\u00a0sem atacar os pr\u00f3prios tecidos do corpo.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Eles desvendaram o papel das&nbsp;<strong>c\u00e9lulas T reguladoras<\/strong>&nbsp;e do gene&nbsp;<strong>Foxp3<\/strong>, pe\u00e7as-chave num processo chamado&nbsp;<strong>toler\u00e2ncia perif\u00e9rica<\/strong>. Esse mecanismo funciona como um \u201cfreio\u201d do sistema imune e abriu caminho para novas terapias contra doen\u00e7as autoimunes, c\u00e2ncer e at\u00e9 para tornar transplantes mais bem-sucedidos.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-nobel-de-medicina-de-2025-como-o-corpo-se-protege-de-si-mesmo\">Nobel de Medicina de 2025: Como o corpo se protege de si mesmo<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">O sistema imunol\u00f3gico \u00e9 um dos mecanismos mais sofisticados do corpo humano. Ele reconhece e combate milhares de microrganismos todos os dias, mas precisa de estrat\u00e9gias para n\u00e3o confundir c\u00e9lulas pr\u00f3prias com invasores.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Esse equil\u00edbrio delicado depende da&nbsp;<strong>toler\u00e2ncia perif\u00e9rica<\/strong>, processo que atua como uma segunda camada de seguran\u00e7a para evitar que o organismo ataque a si mesmo. Foi nesse ponto que se concentraram as descobertas premiadas no Nobel de 2025.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-a-descoberta-de-sakaguchi\">A descoberta de Sakaguchi<\/h2>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/img.odcdn.com.br\/wp-content\/uploads\/2025\/10\/Nobel-de-Medicina-2025-Shimon-Sakaguchi-1024x576.jpg\" alt=\"Ilustra\u00e7\u00e3o de Shimon Sakaguchi, um dos ganhadores do Pr\u00eamio Nobel de Medicina de 2025\" class=\"wp-image-1195538\"\/><figcaption class=\"wp-element-caption\"><em>O imunologista Shimon Sakaguchi identificou uma nova classe de c\u00e9lulas T, chamadas c\u00e9lulas T reguladoras (Imagem: Niklas Elmehed\/Pr\u00eamio Nobel)<\/em><\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Nos anos 1990, a explica\u00e7\u00e3o dominante era que a prote\u00e7\u00e3o contra doen\u00e7as autoimunes vinha apenas da chamada&nbsp;<strong>toler\u00e2ncia central<\/strong>, que elimina no timo as c\u00e9lulas T capazes de atacar o pr\u00f3prio organismo.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Foi contra essa vis\u00e3o que o imunologista japon\u00eas\u00a0<strong>Shimon Sakaguchi<\/strong>\u00a0apresentou uma descoberta decisiva em 1995. A partir de experimentos com camundongos, ele identificou uma nova classe de c\u00e9lulas T, chamadas\u00a0<strong>c\u00e9lulas T reguladoras<\/strong>, que funcionam como \u201c<em>guardas de seguran\u00e7a<\/em>\u201d do sistema imune.\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Essas c\u00e9lulas n\u00e3o atacam diretamente micr\u00f3bios ou tumores, mas controlam a atividade de outras c\u00e9lulas do sistema imunol\u00f3gico. Assim, evitam que ele perca o controle e ataque tecidos saud\u00e1veis.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-brunkow-ramsdell-e-o-gene-foxp3\">Brunkow, Ramsdell e o gene Foxp3<\/h2>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/img.odcdn.com.br\/wp-content\/uploads\/2025\/10\/Nobel-de-Medicina-2025-Mary-Brunkow-e-Fred-Ramsdell-1024x576.jpg\" alt=\"Ilustra\u00e7\u00e3o de Mary Brunkow e Fred Ramsdell, dois dos ganhadores do Pr\u00eamio Nobel de Medicina de 2025\" class=\"wp-image-1195539\"\/><figcaption class=\"wp-element-caption\"><em>Mary Brunkow e Fred Ramsdell descobriram que inflama\u00e7\u00f5es e mortes precoces de linhagem de camundongos estava numa muta\u00e7\u00e3o no gene Foxp3 (Imagem: Niklas Elmehed\/Pr\u00eamio Nobel)<\/em><\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Enquanto isso, nos Estados Unidos, os cientistas&nbsp;<strong>Mary Brunkow<\/strong>&nbsp;e&nbsp;<strong>Fred Ramsdell<\/strong>&nbsp;investigavam uma linhagem de camundongos conhecida como&nbsp;<em>scurfy<\/em>, marcada por inflama\u00e7\u00f5es graves e mortes precoces.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Em 2001, eles descobriram que a causa estava numa muta\u00e7\u00e3o no at\u00e9 ent\u00e3o desconhecido&nbsp;<strong>gene Foxp3<\/strong>. O passo seguinte foi mostrar que muta\u00e7\u00f5es no equivalente humano provocam uma doen\u00e7a rara e devastadora chamada&nbsp;<strong>s\u00edndrome IPEX<\/strong>, caracterizada por desregula\u00e7\u00e3o imunol\u00f3gica e m\u00faltiplas falhas autoimunes.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Essa revela\u00e7\u00e3o n\u00e3o apenas solucionou um enigma m\u00e9dico, mas tamb\u00e9m forneceu a pe\u00e7a que faltava para entender como o sistema imune mant\u00e9m o equil\u00edbrio entre defesa e autodestrui\u00e7\u00e3o.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-a-conexao-que-consolidou-a-teoria\">A conex\u00e3o que consolidou a teoria<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Dois anos depois, em 2003,&nbsp;<strong>Shimon Sakaguchi<\/strong>&nbsp;conseguiu ligar as descobertas. Ele demonstrou que o&nbsp;<strong>Foxp3<\/strong>&nbsp;\u00e9 o gene que controla o desenvolvimento das&nbsp;<strong>c\u00e9lulas T reguladoras<\/strong>&nbsp;que havia identificado em 1995.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/img.odcdn.com.br\/wp-content\/uploads\/2025\/10\/Nobel-de-Medicina-2025-Gene-FoxP3-1024x576.jpg\" alt=\"Ilustra\u00e7\u00e3o do gene Foxp3 no sistema imunol\u00f3gico\" class=\"wp-image-1195540\"\/><figcaption class=\"wp-element-caption\"><em>Sakaguchi demonstrou que o Foxp3 \u00e9 o gene que controla o desenvolvimento de c\u00e9lulas T reguladoras (Imagem: Mattias Karl\u00e9n\/Pr\u00eamio Nobel)<\/em><\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Essa prova consolidou a ideia da&nbsp;<strong>toler\u00e2ncia perif\u00e9rica<\/strong>&nbsp;como um mecanismo essencial para manter o sistema imune sob controle.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A partir desse ponto, a comunidade cient\u00edfica passou a aceitar de forma ampla que n\u00e3o basta eliminar c\u00e9lulas nocivas no timo: \u00e9 preciso tamb\u00e9m contar com um sistema ativo de vigil\u00e2ncia permanente, capaz de frear ataques equivocados do pr\u00f3prio organismo.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-impactos-medicos-e-aplicacoes-atuais\">Impactos m\u00e9dicos e aplica\u00e7\u00f5es atuais<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">As descobertas sobre as c\u00e9lulas T reguladoras e o gene Foxp3 abriram um campo inteiro de pesquisa biom\u00e9dica, com impacto direto na medicina.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Hoje, ensaios cl\u00ednicos exploram formas de manipular essas c\u00e9lulas para&nbsp;<strong>tratar doen\u00e7as autoimunes<\/strong>, como diabetes tipo 1 e l\u00fapus, estimulando sua a\u00e7\u00e3o reguladora.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">No&nbsp;<strong>c\u00e2ncer<\/strong>, a estrat\u00e9gia \u00e9 oposta: tumores costumam recrutar c\u00e9lulas T reguladoras para se proteger do ataque imunol\u00f3gico. E pesquisadores buscam maneiras de bloquear essa barreira.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">J\u00e1 em&nbsp;<strong>transplantes<\/strong>, a multiplica\u00e7\u00e3o de c\u00e9lulas T reguladoras em laborat\u00f3rio e sua reinfus\u00e3o em pacientes \u00e9 estudada como forma de reduzir a rejei\u00e7\u00e3o de \u00f3rg\u00e3os.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Essas aplica\u00e7\u00f5es mostram como a ci\u00eancia b\u00e1sica pode se transformar em terapias concretas, com potencial para beneficiar milh\u00f5es de pessoas no futuro.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">(Essa mat\u00e9ria usou informa\u00e7\u00f5es do site oficinal do Pr\u00eamio Nobel \u2013&nbsp;<a href=\"https:\/\/www.nobelprize.org\/uploads\/2025\/10\/press-medicineprize2025.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">aqui<\/a>&nbsp;e&nbsp;<a href=\"https:\/\/www.nobelprize.org\/uploads\/2025\/10\/popular-medicineprize2025.pdf\" target=\"_blank\" rel=\"noreferrer noopener\">aqui<\/a>.)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Fonte: Olhar Digital <strong>\/ <\/strong> Foto: Niklas Elmehed\/Pr\u00eamio Nobel<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tempo de leitura: 4 minutos O\u00a0Nobel\u00a0de Fisiologia ou Medicina de 2025 foi concedido a\u00a0Mary E.<\/p>\n","protected":false},"author":3,"featured_media":3961,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[51],"tags":[],"class_list":["post-3960","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-health"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - 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