{"id":29898,"date":"2026-01-18T11:00:13","date_gmt":"2026-01-18T14:00:13","guid":{"rendered":"https:\/\/oficialnoticias.com\/?p=29898"},"modified":"2026-01-18T11:00:14","modified_gmt":"2026-01-18T14:00:14","slug":"veneno-de-vespa-inspira-nova-estrategia-contra-o-alzheimer","status":"publish","type":"post","link":"https:\/\/oficialnoticias.com\/?p=29898","title":{"rendered":"Veneno de vespa inspira nova estrat\u00e9gia contra o Alzheimer"},"content":{"rendered":"<p><\/p>\n<div>\n<p>Um projeto interdisciplinar desenvolvido na Universidade de Bras\u00edlia (UnB) abre uma nova frente na busca por terapias capazes de retardar o avan\u00e7o da doen\u00e7a de Alzheimer. A iniciativa explora o potencial terap\u00eautico de mol\u00e9culas inspiradas no veneno do marimbondo-estrela (Polybia occidentalis), uma vespa nativa do Brasil, com resultados promissores na interfer\u00eancia de processos associados \u00e0 neurodegenera\u00e7\u00e3o.<\/p>\n<p>Em estudo publicado no in\u00edcio de 2025 na revista cient\u00edfica Proteins, os pesquisadores demonstraram que duas subst\u00e2ncias, octovespina e fraternina-10, s\u00e3o capazes de interferir na forma\u00e7\u00e3o das placas da prote\u00edna beta-amiloide no c\u00e9rebro. O ac\u00famulo dessas placas entre os neur\u00f4nios est\u00e1 associado \u00e0 inflama\u00e7\u00e3o, \u00e0 interrup\u00e7\u00e3o da comunica\u00e7\u00e3o neural e, ao longo do tempo, \u00e0 morte das c\u00e9lulas nervosas, processo central no desenvolvimento do Alzheimer.<\/p>\n<p>A tentativa de impedir ou desfazer essas forma\u00e7\u00f5es t\u00f3xicas est\u00e1 no foco das chamadas terapias antiamiloides, uma das frentes mais recentes no tratamento da doen\u00e7a. \u201cAs terapias antiamiloides s\u00e3o o que temos de mais novo atualmente\u201d, explica o neurologista Ivan Okamoto, do Hospital Israelita Albert Einstein. No Brasil, esse tipo de tratamento foi aprovado pela Ag\u00eancia Nacional de Vigil\u00e2ncia Sanit\u00e1ria (Anvisa) apenas em abril de 2025, com uso restrito ao medicamento donanemabe, comercializado como Kisunla.<\/p>\n<h2>D\u00e9cadas de pesquisa com venenos<\/h2>\n<p>A investiga\u00e7\u00e3o com pept\u00eddeos derivados do veneno de marimbondos come\u00e7ou h\u00e1 cerca de 25 anos, sob a lideran\u00e7a da neurocientista M\u00e1rcia Mortari, do Instituto de Biologia da UnB. A pesquisadora observou que a picada desses insetos era capaz de paralisar pequenas presas, sinal de que o veneno continha compostos ativos sobre o sistema nervoso.<\/p>\n<p>A partir da\u00ed, teve in\u00edcio um longo processo de isolamento e caracteriza\u00e7\u00e3o das subst\u00e2ncias presentes no veneno. O primeiro pept\u00eddeo identificado, a occidentalina-1202, demonstrou potencial anticonvulsivante. Um de seus derivados, a neurovespina, tamb\u00e9m apresentou efeitos promissores, inclusive com ind\u00edcios de a\u00e7\u00e3o preventiva em doen\u00e7as neurodegenerativas, como o Parkinson.<\/p>\n<p>Com base nesses achados, os cientistas desenvolveram vers\u00f5es modificadas da occidentalina-1202, entre elas a octovespina. Estudos experimentais conduzidos pela professora Luana Camargo, do Instituto de Psicologia da UnB, indicam que a mol\u00e9cula pode atuar nas fases iniciais do Alzheimer, prevenindo a forma\u00e7\u00e3o das placas beta-amiloides, altera\u00e7\u00f5es que come\u00e7am a surgir no c\u00e9rebro de 10 a 15 anos antes dos sintomas cl\u00ednicos, como falhas de mem\u00f3ria e confus\u00e3o mental.<\/p>\n<p>Outra subst\u00e2ncia estudada \u00e9 a alzpeptidina, um pept\u00eddeo h\u00edbrido que combina caracter\u00edsticas da octovespina e da fraternina-10. O objetivo foi potencializar os efeitos terap\u00eauticos observados nos compostos naturais. Segundo os autores, a estrat\u00e9gia permitiu testar diferentes modifica\u00e7\u00f5es estruturais de forma r\u00e1pida e controlada, em busca de mol\u00e9culas mais est\u00e1veis, seletivas e eficazes.<\/p>\n<p>Simula\u00e7\u00f5es computacionais realizadas por pesquisadores do Instituto de F\u00edsica da UnB indicaram que esses pept\u00eddeos provocam altera\u00e7\u00f5es estruturais relevantes nas placas beta-amiloides, sugerindo forte potencial de desagrega\u00e7\u00e3o. Em testes com camundongos, a octovespina, administrada diretamente no c\u00e9rebro, reduziu tanto a aglomera\u00e7\u00e3o das prote\u00ednas quanto sintomas como o esquecimento. \u201cEssa \u00e9 uma diferen\u00e7a importante em rela\u00e7\u00e3o aos medicamentos dispon\u00edveis atualmente\u201d, destacam os cientistas.<\/p>\n<p><bsp-list-loadmore class=\"PageListStandardG\" data-module=\"\" data-show-loadmore=\"true\" data-list-title-size=\"3\" data-list-description-size=\"3\"><\/p>\n<p>    <a class=\"AnchorLink\" title=\"leia-tambem\" name=\"leia-tambem\"\/><\/p>\n<p><\/bsp-list-loadmore><\/p>\n<h2>Desafios e pr\u00f3ximos passos<\/h2>\n<p>Apesar dos avan\u00e7os, os resultados ainda apresentam limita\u00e7\u00f5es. Enquanto a octovespina mostrou efeitos mais consistentes em modelos animais, a fraternina-10 n\u00e3o conseguiu reverter d\u00e9ficits cognitivos em camundongos com altera\u00e7\u00f5es semelhantes \u00e0s observadas no Alzheimer humano. Segundo os pesquisadores, isso se deve, em parte, \u00e0s diferen\u00e7as entre simula\u00e7\u00f5es computacionais, testes em laborat\u00f3rio e a complexidade de um organismo vivo.<\/p>\n<p>Ainda assim, a concord\u00e2ncia entre simula\u00e7\u00f5es e experimentos fornece previsibilidade e orienta o desenvolvimento racional de novos f\u00e1rmacos. Antes de qualquer aplica\u00e7\u00e3o cl\u00ednica, por\u00e9m, ser\u00e1 necess\u00e1rio avan\u00e7ar em estudos pr\u00e9-cl\u00ednicos mais amplos, definir formas vi\u00e1veis de administra\u00e7\u00e3o &#8211; j\u00e1 que a aplica\u00e7\u00e3o direta no c\u00e9rebro n\u00e3o \u00e9 fact\u00edvel &#8211; e avaliar dose, toxicidade, seguran\u00e7a e farmacocin\u00e9tica.<\/p>\n<h2>Impacto do envelhecimento populacional<\/h2>\n<p>A busca por novos tratamentos ganha urg\u00eancia diante do envelhecimento acelerado da popula\u00e7\u00e3o brasileira. Com a invers\u00e3o da pir\u00e2mide demogr\u00e1fica, o Alzheimer desponta como um dos principais desafios de sa\u00fade p\u00fablica nas pr\u00f3ximas d\u00e9cadas.<\/p>\n<p>Em 2019, o Brasil registrava cerca de 1,8 milh\u00e3o de pessoas com doen\u00e7as neurodegenerativas, segundo o Relat\u00f3rio Nacional sobre a Dem\u00eancia, publicado pelo Minist\u00e9rio da Sa\u00fade em 2024. A estimativa \u00e9 que esse n\u00famero chegue a 5,7 milh\u00f5es em 2050.<\/p>\n<p>Embora lapsos de mem\u00f3ria ocasionais fa\u00e7am parte do envelhecimento normal, sinais frequentes que comprometem a seguran\u00e7a e a autonomia do indiv\u00edduo exigem investiga\u00e7\u00e3o m\u00e9dica. Exames de imagem, como o PET-CT amiloide, permitem identificar biomarcadores da doen\u00e7a ainda em fases iniciais.<\/p>\n<p>Para Okamoto, mesmo sem representar uma cura, os tratamentos antiamiloides podem ter impacto relevante. \u201cEles ajudam a frear o avan\u00e7o da doen\u00e7a, estabilizando o processo de degenera\u00e7\u00e3o cognitiva e preservando a autonomia do paciente\u201d, afirma. Em um cen\u00e1rio de crescimento dos casos e de sobrecarga para fam\u00edlias e sistemas de sa\u00fade, avan\u00e7os como os obtidos a partir do veneno de vespa refor\u00e7am a import\u00e2ncia do investimento cont\u00ednuo em pesquisa cient\u00edfica.<\/p>\n<p>*Com Ag\u00eancia Einstein<\/p>\n<\/p><\/div>\n<p><script>\n  window.fbAsyncInit = function() {\n      FB.init({\n              appId : '1447052969554341',\n          xfbml : true,\n          version : 'v2.9'\n      });\n  };\n  (function(d, s, id){\n     var js, fjs = d.getElementsByTagName(s)[0];\n     if (d.getElementById(id)) {return;}\n     js = d.createElement(s); js.id = id;\n     js.src = \"https:\/\/connect.facebook.net\/en_US\/sdk.js\";\n     fjs.parentNode.insertBefore(js, fjs);\n   }(document, 'script', 'facebook-jssdk'));\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Um projeto interdisciplinar desenvolvido na Universidade de Bras\u00edlia (UnB) abre uma nova frente na busca por terapias capazes de retardar o avan\u00e7o da doen\u00e7a de Alzheimer. A iniciativa explora o potencial terap\u00eautico de mol\u00e9culas inspiradas no veneno do marimbondo-estrela (Polybia occidentalis), uma vespa nativa do Brasil, com resultados promissores na interfer\u00eancia de processos associados \u00e0&#8230;<\/p>\n","protected":false},"author":2,"featured_media":29899,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-29898","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sem-categoria"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Veneno de vespa inspira nova estrat\u00e9gia contra o Alzheimer -<\/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:\/\/oficialnoticias.com\/?p=29898\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Veneno de vespa inspira nova estrat\u00e9gia contra o Alzheimer -\" \/>\n<meta property=\"og:description\" content=\"Um projeto interdisciplinar desenvolvido na Universidade de Bras\u00edlia (UnB) abre uma nova frente na busca por terapias capazes de retardar o avan\u00e7o da doen\u00e7a de Alzheimer. A iniciativa explora o potencial terap\u00eautico de mol\u00e9culas inspiradas no veneno do marimbondo-estrela (Polybia occidentalis), uma vespa nativa do Brasil, com resultados promissores na interfer\u00eancia de processos associados \u00e0...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/oficialnoticias.com\/?p=29898\" \/>\n<meta property=\"article:published_time\" content=\"2026-01-18T14:00:13+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-01-18T14:00:14+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/oficialnoticias.com\/wp-content\/uploads\/2026\/01\/urlhttps3A2F2Fk2-prod-radio-itatiaia.s3.us-east-1.amazonaws.com2Fbrightspot2Fc92Fb22F5bd068.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"630\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"Luana Gon\u00e7alves\" \/>\n<meta name=\"twitter:card\" 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