{"id":25619,"date":"2023-09-08T21:05:30","date_gmt":"2023-09-08T21:05:30","guid":{"rendered":"https:\/\/test.otpor.media\/index.php\/2023\/09\/08\/https-otpor-media-znanstvenici-po-prvi-put-uzgojili-model-ljudskog-embrija-bez-spermija-i-jajne-stanice\/"},"modified":"2023-09-08T21:05:30","modified_gmt":"2023-09-08T21:05:30","slug":"https-otpor-media-znanstvenici-po-prvi-put-uzgojili-model-ljudskog-embrija-bez-spermija-i-jajne-stanice","status":"publish","type":"post","link":"https:\/\/otpor.media\/?p=25619","title":{"rendered":"Znanstvenici po prvi put uzgojili model ljudskog embrija &#8211; bez spermija i jajne stanice!"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Ambicija modela embrija je pru\u017eiti eti\u010dki na\u010din razumijevanja najranijih trenutaka na\u0161ih \u017eivota.<br><br>Znanstvenici su uzgojili entitet koji vrlo nalikuje ranom ljudskom embriju, bez kori\u0161tenja sperme, jaja\u0161ca ili maternice.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tim Weizmann Instituta ka\u017ee da njihov &#8220;model embrija&#8221;, napravljen kori\u0161tenjem mati\u010dnih stanica, izgleda kao \u0161kolski primjer pravog 14-dnevnog embrija.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u010cak je osloba\u0111ao hormone koji su test na trudno\u0107u \u010dinili pozitivnim u laboratoriju.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ambicija modela embrija je pru\u017eiti eti\u010dki na\u010din razumijevanja najranijih trenutaka na\u0161ih \u017eivota.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Prvi tjedni nakon \u0161to spermij oplodi jajnu stanicu razdoblje je dramati\u010dne promjene &#8211; od skupa nejasnih stanica do ne\u010dega \u0161to na kraju postaje prepoznatljivo na snimci bebe.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ovo klju\u010dno vrijeme glavni je izvor poba\u010daja i uro\u0111enih mana, ali ga slabo razumijemo.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To je crna kutija i to nije kli\u0161e &#8211; na\u0161e je znanje vrlo ograni\u010deno, ka\u017ee prof. Jacob Hanna s Weizmann Instituta za znanost.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Istra\u017eivanje embrija je zakonski, eti\u010dki i tehni\u010dki bremenito. Ali sada postoji brzo razvijaju\u0107e polje koje opona\u0161a prirodni razvoj embrija.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ovo istra\u017eivanje, objavljeno u \u010dasopisu Nature, izraelski tim opisuje kao prvi &#8220;potpuni&#8221; model embrija za opona\u0161anje svih klju\u010dnih struktura koje se pojavljuju u ranom embriju.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ovo je stvarno ud\u017ebeni\u010dka slika ljudskog embrija, ka\u017ee profesorica Hanna, \u0161to \u2018jo\u0161 nije u\u010dinjeno\u2018.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Umjesto spermija i jaja\u0161ca, po\u010detni materijal bile su naivne mati\u010dne stanice \u2013 reprogramirane da dobiju potencijal da postanu bilo koja vrsta tkiva u tijelu.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Zatim su kori\u0161tene kemikalije kako bi se te mati\u010dne stanice nagovorile da postanu \u010detiri vrste stanica koje se nalaze u najranijim fazama ljudskog embrija:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8211; stanice epiblasta, koje postaju pravi embrij (ili fetus)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8211; stanice trofoblasta, koje postaju placenta<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8211; stanice hipoblasta, koje postaju potporna \u017eumanj\u010dana vre\u0107ica<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8211; ekstraembrionalne stanice mezoderma<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ukupno 120 ovih stanica pomije\u0161ano je u to\u010dno odre\u0111enom omjeru &#8211; a zatim se znanstvenici odmaknu i promatraju.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Otprilike 1% smjese zapo\u010delo je putovanje spontanog sastavljanja u strukturu koja nalikuje, ali nije identi\u010dna ljudskom embriju.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dajem veliku zaslugu stanicama &#8211; morate imati pravu mje\u0161avinu i imati pravo okru\u017eenje i to \u0107e jednostavno krenuti, ka\u017ee prof. Hanna. &#8211; To je nevjerojatan fenomen.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Modeli embrija pu\u0161teni su da rastu i razvijaju se sve dok nisu bili usporedivi s embrijem 14 dana nakon oplodnje. U mnogim zemljama ovo je zakonska granica za normalno istra\u017eivanje embrija. Unato\u010d kasnono\u0107nom videopozivu, mogu \u010duti strast dok me profesorica Hanna vodi u 3D obilazak &#8220;izvanredno fine arhitekture&#8221; modela embrija.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mogu vidjeti trofoblast, koji bi ina\u010de postao posteljica, kako obavija embrij. A uklju\u010duje i \u0161upljine &#8211; koje se nazivaju praznine &#8211; koje se pune maj\u010dinom krvlju za prijenos hranjivih tvari do djeteta. Tu je \u017eumanj\u010dana vre\u0107ica, koja ima neke od uloga jetre i bubrega, i bilaminarni embrionalni disk &#8211; jedno od klju\u010dnih obilje\u017eja ove faze razvoja embrija.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nadamo se da modeli embrija mogu pomo\u0107i znanstvenicima da objasne kako nastaju razli\u010dite vrste stanica, da svjedo\u010de o najranijim koracima u izgradnji tjelesnih organa ili da razumiju nasljedne ili genetske bolesti.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ova studija ve\u0107 pokazuje da se drugi dijelovi embrija ne\u0107e formirati ako ga rane stanice placente ne mogu okru\u017eiti.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u010cak se govori o pobolj\u0161anju stope uspje\u0161nosti in vitro oplodnje (IVF) tako \u0161to \u0107e se razumjeti za\u0161to neki embriji ne uspijevaju ili kori\u0161tenjem modela za testiranje jesu li lijekovi sigurni tijekom trudno\u0107e.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Profesor Robin Lovell Badge, koji istra\u017euje razvoj embrija na Institutu Francis Crick, ka\u017ee da ovi modeli embrija &#8220;izgledaju prili\u010dno dobro&#8221; i &#8220;izgledaju prili\u010dno normalno&#8221;. &#8211; Mislim da je dobro, mislim da je jako dobro napravljeno, sve ima smisla i prili\u010dno sam impresioniran, ka\u017ee on. Ali sada\u0161nju stopu neuspjeha od 99% treba pobolj\u0161ati, dodaje. Bilo bi te\u0161ko razumjeti \u0161to je po\u0161lo po zlu kod poba\u010daja ili neplodnosti ako se model ve\u0107inu vremena nije uspio sastaviti.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Rad tako\u0111er postavlja pitanje mo\u017ee li se opona\u0161ati razvoj embrija nakon faze od 14 dana. To ne bi bilo protuzakonito, \u010dak ni u Ujedinjenom Kraljevstvu, budu\u0107i da se modeli embrija zakonski razlikuju od embrija.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Neki \u0107e ovo pozdraviti &#8211; ali drugima se ne\u0107e svidjeti, ka\u017ee profesor Lovell-Badge. Profesor Alfonso Martinez Arias, s odjela za eksperimentalne i zdravstvene znanosti na Sveu\u010dili\u0161tu Pompeu Fabra, rekao je da je to &#8220;najva\u017eniji dio istra\u017eivanja&#8221;. &#8211; Rad je, po prvi put, postigao vjernu konstrukciju kompletne strukture ljudskog embrija iz mati\u010dnih stanica u laboratoriju, rekao je, \u2018\u010dime su otvorena vrata za studije doga\u0111aja koji su doveli do formiranja plana ljudskog tijela\u2018.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Istra\u017eiva\u010di nagla\u0161avaju da bi bilo neeti\u010dno, nezakonito i zapravo nemogu\u0107e posti\u0107i trudno\u0107u kori\u0161tenjem ovih modela embrija &#8211; sastavljanje 120 stanica zajedno ide dalje od to\u010dke u kojoj bi se embrij mogao uspje\u0161no implantirati u sluznicu maternice<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/www.bbc.com\/news\/health-66715669\">BBC.com<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ambicija modela embrija je pru\u017eiti eti\u010dki na\u010din razumijevanja najranijih trenutaka na\u0161ih \u017eivota. Znanstvenici su uzgojili entitet koji vrlo nalikuje ranom ljudskom embriju, bez kori\u0161tenja sperme, jaja\u0161ca ili maternice. Tim Weizmann Instituta ka\u017ee da njihov &#8220;model embrija&#8221;, napravljen kori\u0161tenjem mati\u010dnih stanica, izgleda kao \u0161kolski primjer pravog 14-dnevnog embrija. \u010cak je osloba\u0111ao hormone koji su test na [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":25620,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":0,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[163],"tags":[],"class_list":["post-25619","post","type-post","status-publish","format-standard","has-post-thumbnail","category-revolucijska-znanost"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.5 (Yoast SEO v28.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Znanstvenici po prvi put uzgojili model ljudskog embrija - bez spermija i jajne stanice! - OTPOR.Media<\/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:\/\/otpor.media\/?p=25619\" \/>\n<meta property=\"og:locale\" content=\"hr_HR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Znanstvenici po prvi put uzgojili model ljudskog embrija - bez spermija i jajne stanice!\" \/>\n<meta property=\"og:description\" content=\"Ambicija modela embrija je pru\u017eiti eti\u010dki na\u010din razumijevanja najranijih trenutaka na\u0161ih \u017eivota. 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Tim Weizmann Instituta ka\u017ee da njihov &#8220;model embrija&#8221;, napravljen kori\u0161tenjem mati\u010dnih stanica, izgleda kao \u0161kolski primjer pravog 14-dnevnog embrija. \u010cak je osloba\u0111ao hormone koji su test na [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/otpor.media\/?p=25619\" \/>\n<meta property=\"og:site_name\" content=\"OTPOR.Media\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/otpor.media\" \/>\n<meta property=\"article:published_time\" content=\"2023-09-08T21:05:30+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/i0.wp.com\/otpor.media\/wp-content\/uploads\/2024\/07\/embrij-080923.jpg?fit=976%2C549&ssl=1\" \/>\n\t<meta property=\"og:image:width\" content=\"976\" \/>\n\t<meta property=\"og:image:height\" content=\"549\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"otpormedia\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Napisao\/la\" \/>\n\t<meta name=\"twitter:data1\" content=\"otpormedia\" \/>\n\t<meta name=\"twitter:label2\" content=\"Procijenjeno vrijeme \u010ditanja\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/otpor.media\\\/?p=25619#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/otpor.media\\\/?p=25619\"},\"author\":{\"name\":\"otpormedia\",\"@id\":\"https:\\\/\\\/otpor.media\\\/#\\\/schema\\\/person\\\/a274232a44e6bceb3b5681f0fe2474ab\"},\"headline\":\"Znanstvenici po prvi put uzgojili model ljudskog embrija &#8211; bez spermija i jajne stanice!\",\"datePublished\":\"2023-09-08T21:05:30+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/otpor.media\\\/?p=25619\"},\"wordCount\":848,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/otpor.media\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/otpor.media\\\/?p=25619#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/otpor.media\\\/wp-content\\\/uploads\\\/2024\\\/07\\\/embrij-080923.jpg\",\"articleSection\":[\"(R)EVOLUCIJSKA ZNANOST\"],\"inLanguage\":\"hr\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/otpor.media\\\/?p=25619#respond\"]}],\"copyrightYear\":\"2023\",\"copyrightHolder\":{\"@id\":\"https:\\\/\\\/otpor.media\\\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/otpor.media\\\/?p=25619\",\"url\":\"https:\\\/\\\/otpor.media\\\/?p=25619\",\"name\":\"Znanstvenici po prvi put uzgojili model ljudskog embrija - bez spermija i jajne stanice! 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Znanstvenici su uzgojili entitet koji vrlo nalikuje ranom ljudskom embriju, bez kori\u0161tenja sperme, jaja\u0161ca ili maternice. 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