{"id":49275,"date":"2025-03-13T07:38:41","date_gmt":"2025-03-13T07:38:41","guid":{"rendered":"https:\/\/www.elza-institute.com\/?p=45507"},"modified":"2025-03-13T07:38:41","modified_gmt":"2025-03-13T07:38:41","slug":"cxl-research-is-oxygen-really-necessary-for-corneal-cross-linking","status":"publish","type":"post","link":"https:\/\/www.elza-institute.com\/pt\/cxl-research-is-oxygen-really-necessary-for-corneal-cross-linking\/","title":{"rendered":"Investiga\u00e7\u00e3o sobre CXL: O oxig\u00e9nio \u00e9 realmente necess\u00e1rio para o Cross-Linking da c\u00f3rnea?"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"49275\" class=\"elementor elementor-49275\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d7787a8 e-flex e-con-boxed e-con e-parent\" data-id=\"d7787a8\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-7807fa2 e-con-full e-flex e-con e-child\" data-id=\"7807fa2\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-417ca1c elementor-widget elementor-widget-image\" data-id=\"417ca1c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"713\" src=\"https:\/\/www.elza-institute.com\/wp-content\/uploads\/2025\/03\/i2164-2591-14-3-1-f1_1740757809.66161-1024x912.png\" class=\"attachment-large size-large wp-image-45509\" alt=\"Aparelho TVST Aydemir et al.\" srcset=\"https:\/\/www.elza-institute.com\/wp-content\/uploads\/2025\/03\/i2164-2591-14-3-1-f1_1740757809.66161-1024x912.png 1024w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2025\/03\/i2164-2591-14-3-1-f1_1740757809.66161-300x267.png 300w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2025\/03\/i2164-2591-14-3-1-f1_1740757809.66161-768x684.png 768w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2025\/03\/i2164-2591-14-3-1-f1_1740757809.66161-13x12.png 13w, https:\/\/www.elza-institute.com\/wp-content\/uploads\/2025\/03\/i2164-2591-14-3-1-f1_1740757809.66161.png 1050w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-58fb2be e-con-full e-flex e-con e-child\" data-id=\"58fb2be\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-757c035 elementor-widget elementor-widget-text-editor\" data-id=\"757c035\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3 data-start=\"242\" data-end=\"317\" style=\"font-family: Gotham, Roboto; color: rgb(84, 89, 95);\"><span style=\"text-align: var(--text-align); background-color: initial; color: var( --e-global-color-secondary ); font-size: 17px;\">Durante anos, a reticula\u00e7\u00e3o da c\u00f3rnea (CXL) seguiu um gui\u00e3o bioqu\u00edmico bem definido: riboflavina, luz UV-A e, fundamentalmente, oxig\u00e9nio. Se retirarmos o oxig\u00e9nio da equa\u00e7\u00e3o, interrompemos a pr\u00f3pria rea\u00e7\u00e3o que endurece a c\u00f3rnea. Isso j\u00e1 foi comprovado. Mas o CXL faz mais do que apenas endurecer a c\u00f3rnea - tamb\u00e9m aumenta a resist\u00eancia \u00e0 digest\u00e3o enzim\u00e1tica, e \u00e9 a\u00ed que as coisas ficam interessantes.<\/span><\/h3>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-9fe743b e-flex e-con-boxed e-con e-parent\" data-id=\"9fe743b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0feaf82 elementor-widget elementor-widget-text-editor\" data-id=\"0feaf82\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3 data-start=\"242\" data-end=\"317\"><span style=\"color: var( --e-global-color-secondary ); font-family: inherit; letter-spacing: 0.3px; text-align: var(--text-align); background-color: initial;\">Porqu\u00ea\u00a0<\/span><span style=\"background-color: initial; color: var( --e-global-color-secondary ); font-family: inherit; letter-spacing: 0.3px; text-align: var(--text-align);\">Investiga\u00e7\u00e3o CXL em\u00a0<\/span><span style=\"background-color: initial; color: var( --e-global-color-secondary ); font-family: inherit; letter-spacing: 0.3px; text-align: var(--text-align);\">A resist\u00eancia enzim\u00e1tica \u00e9 importante<\/span><\/h3><p data-start=\"789\" data-end=\"1231\">A inflama\u00e7\u00e3o, um fator chave no ceratocone, pode elevar os n\u00edveis de enzimas proteol\u00edticas na c\u00f3rnea, acelerando potencialmente a sua degrada\u00e7\u00e3o. Na queratite infecciosa, o problema \u00e9 ainda mais direto - os agentes patog\u00e9nicos segregam proteases para decompor o tecido da c\u00f3rnea como fonte de alimento. Felizmente, a investiga\u00e7\u00e3o sobre o CXL demonstrou que a reticula\u00e7\u00e3o aumenta a resist\u00eancia da c\u00f3rnea \u00e0 degrada\u00e7\u00e3o enzim\u00e1tica. Mas ser\u00e1 que o oxig\u00e9nio \u00e9 necess\u00e1rio para este efeito?<\/p><p data-start=\"1233\" data-end=\"1519\">Um novo estudo, conduzido por M. <a href=\"https:\/\/www.elza-institute.com\/pt\/enes-aydemir\/\">Enes Aydemir<\/a> e publicado em <em data-start=\"1297\" data-end=\"1340\"><a href=\"https:\/\/tvst.arvojournals.org\/article.aspx?articleid=2802650\">Ci\u00eancia e tecnologia translacional da vis\u00e3o<\/a><\/em>O estudo de CXL da C\u00f3rnea, de 2006, fornece uma resposta surpreendente - n\u00e3o, n\u00e3o fornece. Esta investiga\u00e7\u00e3o inovadora sobre CXL revela que a resist\u00eancia da c\u00f3rnea \u00e0 digest\u00e3o enzim\u00e1tica pode ser melhorada sem oxig\u00e9nio.<\/p><h3 data-start=\"1521\" data-end=\"1569\">Oxig\u00e9nio no CXL: Um pressuposto posto em causa<\/h3><p data-start=\"1571\" data-end=\"2073\">Este facto vai contra a sabedoria convencional. O protocolo padr\u00e3o de Dresden para o CXL sempre foi dependente do oxig\u00e9nio. O processo baseia-se numa rea\u00e7\u00e3o fotoqu\u00edmica em que os raios UV-A excitam a riboflavina, gerando esp\u00e9cies reactivas de oxig\u00e9nio (ROS) que conduzem o processo de reticula\u00e7\u00e3o. A investiga\u00e7\u00e3o anterior sobre CXL, como o estudo de 2013 de Richoz et al., estabeleceu firmemente que o oxig\u00e9nio \u00e9 essencial para o refor\u00e7o biomec\u00e2nico. O pressuposto era claro: sem oxig\u00e9nio, n\u00e3o h\u00e1 reticula\u00e7\u00e3o.<\/p><p data-start=\"2075\" data-end=\"2198\">Mas Aydemir et al. introduziram uma grande mudan\u00e7a neste modelo. O seu estudo testou tr\u00eas protocolos CXL diferentes:<\/p><ul data-start=\"2199\" data-end=\"2376\"><li data-start=\"2199\" data-end=\"2257\">CXL tradicional com riboflavina\/UV-A (protocolo de Dresden)<\/li><li data-start=\"2258\" data-end=\"2293\">Rosa bengala\/verde claro CXL<\/li><li data-start=\"2294\" data-end=\"2376\">Uma abordagem combinada utilizando riboflavina\/UV-A e rosa bengala\/luz verde<\/li><\/ul><p data-start=\"2378\" data-end=\"2478\">Os investigadores expuseram ent\u00e3o as c\u00f3rneas a uma digest\u00e3o enzim\u00e1tica e mediram o tempo de degrada\u00e7\u00e3o.<\/p><h3 data-start=\"2480\" data-end=\"2526\">Descobertas inovadoras na investiga\u00e7\u00e3o sobre CXL<\/h3><p data-start=\"2528\" data-end=\"2546\">Os principais resultados:<\/p><ul data-start=\"2547\" data-end=\"3078\"><li data-start=\"2547\" data-end=\"2676\">Os tr\u00eas protocolos de CXL aumentaram significativamente a resist\u00eancia da c\u00f3rnea \u00e0 digest\u00e3o enzim\u00e1tica em compara\u00e7\u00e3o com os controlos n\u00e3o tratados.<\/li><li data-start=\"2677\" data-end=\"2786\">O CXL de rosa bengala\/luz verde foi eficaz, por si s\u00f3, no aumento da resist\u00eancia - sem necessidade de oxig\u00e9nio.<\/li><li data-start=\"2787\" data-end=\"2953\">O protocolo combinado (riboflavina\/UV-A + rosa bengala\/luz verde) aumentou ainda mais a resist\u00eancia, sugerindo um efeito sin\u00e9rgico entre os dois m\u00e9todos.<\/li><li data-start=\"2954\" data-end=\"3078\">O m\u00e9todo tradicional riboflavina\/UV-A, como esperado, permaneceu dependente do oxig\u00e9nio para os seus efeitos de resist\u00eancia enzim\u00e1tica.<br \/><br \/><\/li><\/ul><p data-start=\"3080\" data-end=\"3396\">Esta investiga\u00e7\u00e3o sobre o CXL sugere que a resist\u00eancia enzim\u00e1tica e a rigidez biomec\u00e2nica podem ser impulsionadas por mecanismos diferentes. Enquanto o CXL tradicional de riboflavina\/UV-A necessita de oxig\u00e9nio para o refor\u00e7o estrutural, a reticula\u00e7\u00e3o \u00e0 base de rosa de bengala n\u00e3o necessita, abrindo novas possibilidades para abordagens de tratamento.<\/p><h3 data-start=\"3398\" data-end=\"3459\">Como \u00e9 que esta investiga\u00e7\u00e3o sobre o CXL informa a pr\u00e1tica cl\u00ednica<\/h3><p data-start=\"3461\" data-end=\"3769\">As implica\u00e7\u00f5es desta investiga\u00e7\u00e3o sobre CXL podem ser profundas. A depend\u00eancia do oxig\u00e9nio tem sido, desde h\u00e1 muito, um fator limitativo do reticulado da c\u00f3rnea, exigindo um controlo ambiental rigoroso e restringindo a disponibilidade do tratamento em determinados locais, como regi\u00f5es de elevada altitude ou cl\u00ednicas com poucos recursos.<\/p><p data-start=\"3771\" data-end=\"4004\">Se o CXL \u00e0 base de rosa de bengala contornar este requisito e continuar a aumentar a resist\u00eancia enzim\u00e1tica, poder\u00e1 tornar o procedimento mais acess\u00edvel e robusto face a vari\u00e1veis externas. No entanto, \u00e9 necess\u00e1ria mais investiga\u00e7\u00e3o.<\/p><ul data-start=\"4006\" data-end=\"4275\"><li data-start=\"4006\" data-end=\"4093\">Ser\u00e1 que o CXL independente de oxig\u00e9nio confere o mesmo refor\u00e7o estrutural a longo prazo?<\/li><li data-start=\"4094\" data-end=\"4182\">Poder\u00e1 igualar ou exceder a durabilidade dos protocolos tradicionais baseados na riboflavina?<\/li><li data-start=\"4183\" data-end=\"4275\">Qual \u00e9 o mecanismo exato subjacente \u00e0 resist\u00eancia enzim\u00e1tica no CXL independente do oxig\u00e9nio?<\/li><\/ul><p data-start=\"4277\" data-end=\"4357\">Estas s\u00e3o as quest\u00f5es que ir\u00e3o definir o pr\u00f3ximo cap\u00edtulo da investiga\u00e7\u00e3o sobre o CXL.<\/p><h3 data-start=\"4359\" data-end=\"4394\">Investiga\u00e7\u00e3o CXL: O que se segue?<\/h3><p data-start=\"4396\" data-end=\"4666\">Uma coisa \u00e9 certa: este estudo n\u00e3o se limita a ajustar a f\u00f3rmula - obriga-nos a reexaminar a qu\u00edmica do CXL a partir do zero. Se o oxig\u00e9nio n\u00e3o \u00e9 essencial em algumas formas de reticula\u00e7\u00e3o, que outros pressupostos bioqu\u00edmicos est\u00e3o \u00e0 espera de serem reescritos?<\/p><p data-start=\"4668\" data-end=\"4913\">Esta investiga\u00e7\u00e3o sobre CXL abre a porta a novas estrat\u00e9gias de reticula\u00e7\u00e3o que poder\u00e3o remodelar o tratamento do ceratocone e a terapia da c\u00f3rnea. O pr\u00f3ximo desafio? Compreender como traduzir estas descobertas para a pr\u00e1tica cl\u00ednica do mundo real.<\/p><p data-start=\"4915\" data-end=\"5133\"><em data-start=\"4915\" data-end=\"5131\">Refer\u00eancia: Aydemir ME, Hafezi NL, Lu NJ, et al. A resist\u00eancia da c\u00f3rnea \u00e0 digest\u00e3o enzim\u00e1tica ap\u00f3s a reticula\u00e7\u00e3o de rosa bengala e rosa bengala\/riboflavina combinada \u00e9 independente do oxig\u00e9nio. Trans Vis Sci Tech. 2025;14(3):1. <a href=\"https:\/\/tvst.arvojournals.org\/article.aspx?articleid=2802650\">Liga\u00e7\u00e3o<\/a><\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>A nova investiga\u00e7\u00e3o sobre CXL desafia o papel do oxig\u00e9nio na reticula\u00e7\u00e3o da c\u00f3rnea. Poder\u00e1 o CXL independente do oxig\u00e9nio melhorar o tratamento do ceratocone? Descubra como este avan\u00e7o pode mudar a pr\u00e1tica cl\u00ednica.<\/p>","protected":false},"author":4,"featured_media":49208,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[770,95],"tags":[930,352,1139,100,957,1140,1141,1142,532,292,669,1143,689],"class_list":["post-49275","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enes-aydemir","category-scientific-article","tag-532-nm","tag-corneal-cross-linking","tag-corneale-crosslinking","tag-cxl","tag-digestion","tag-digestion-resistance","tag-enzymatic-digestion","tag-greem-light","tag-oxygen","tag-riboflavin","tag-rose-bengal","tag-sauerstoff","tag-ultraviolet"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>CXL Research: Is Oxygen Really Necessary for Corneal Cross-Linking? - The ELZA Institute<\/title>\n<meta name=\"description\" content=\"ELZA&#039;s M. 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