Vitam\u00edn B podle experimentu mezin\u00e1rodn\u00edho v\u011bdeck\u00e9ho t\u00fdmu dok\u00e1\u017ee \u010d\u00e1ste\u010dn\u011b ochr\u00e1nit p\u0159ed onemocn\u011bn\u00edmi zp\u016fsoben\u00fdmi zne\u010di\u0161t\u011bn\u00fdm vzduchem. A\u010dkoli v\u00fdsledky studie jsou povzbudiv\u00e9, v\u011bdci upozor\u0148uj\u00ed, \u017ee experimentu se z\u00fa\u010dastnilo jen deset lid\u00ed. K doc\u00edlen\u00ed v\u011bt\u0161\u00ed v\u011brohodnosti bude proto zapot\u0159eb\u00ed ho opakovat ve v\u011bt\u0161\u00edm rozsahu, informoval zpravodajsk\u00fd web BBC.
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\u017de zne\u010di\u0161t\u011bn\u00ed m\u00e1 na lidsk\u00fd organismus \u0161patn\u00fd dopad, je zn\u00e1mo. Jak p\u0159esn\u011b prachov\u00e9 \u010d\u00e1stice ve vzduchu lidem \u0161kod\u00ed, ale v\u011bdci podle BBC zat\u00edm podrobn\u011b neprozkoumali. V\u00edce ne\u017e 90 procent sv\u011btov\u00e9 populace p\u0159itom podle Sv\u011btov\u00e9 zdravotnick\u00e9 organizace \u017eije v oblastech, kde zne\u010di\u0161t\u011bn\u00ed vzduchu p\u0159ekra\u010duje bezpe\u010dnou normu.<\/p>\n
Jedna z prachov\u00fdch \u010d\u00e1stic, kter\u00e1 je vn\u00edm\u00e1na jako nejrizikov\u011bj\u0161\u00ed, m\u00e1 pr\u016fm\u011br asi 2,5 mikrometru a naz\u00fdv\u00e1 se PM2,5. Vznik\u00e1 nap\u0159\u00edklad p\u00e1len\u00edm d\u0159eva \u010di v dieselov\u00fdch motorech, je asi t\u0159icetkr\u00e1t u\u017e\u0161\u00ed ne\u017e lidsk\u00fd vlas a m\u016f\u017ee zp\u016fsobit srde\u010dn\u00ed \u010di d\u00fdchac\u00ed probl\u00e9my.<\/p>\n
V\u011bdci se domn\u00edvaj\u00ed, \u017ee PM2,5 v bu\u0148k\u00e1ch vyvol\u00e1v\u00e1 takzvan\u00e9 epigenetick\u00e9 zm\u011bny, kter\u00e9 mohou \u0161kodit zdrav\u00ed. Geny v lidsk\u00e9m DNA jsou jak\u00fdmisi instrukcemi k \u017eivotu, ov\u0161em epigenetika, ozna\u010dovan\u00e1 za podobor genetiky, ur\u010duje, jak tyto instrukce budou pou\u017eity. Lze to p\u0159irovnat ke vztahu hudebn\u00edho p\u0159ehr\u00e1va\u010de a ovlada\u010de zvuku – hudebn\u00ed t\u00f3ny (geny) usly\u0161\u00edte a\u017e pot\u00e9, co zv\u00fd\u0161\u00edte hlasitost zvuku (epigenetick\u00e9 zm\u011bny).<\/p>\n
Experiment nazna\u010duje, \u017ee zne\u010di\u0161t\u011bn\u00fd vzduch na epigenetick\u00e9 \u00farovni ovliv\u0148uje geny odpov\u011bdn\u00e9 za imunitn\u00ed syst\u00e9m. Jin\u00fdmi slovy prachov\u00e9 \u010d\u00e1stice mohou ur\u010dit\u00e9 geny „vyp\u00ednat“ a sn\u00ed\u017eit tak lidskou obranyschopnost.<\/p>\n
Mezin\u00e1rodn\u00ed t\u00fdm v\u011bdc\u016f cht\u011bl zjistit, zda vysok\u00e1 koncentrace \u010d\u00e1stic PM2,5 bude m\u00edt m\u00e9n\u011b negativn\u00ed dopad, pokud testovac\u00ed subjekty budou u\u017e\u00edvat vitamin B. Deset dobrovoln\u00edk\u016f bylo zprvu vystaveno \u010dist\u00e9mu vzduchu a u\u017e\u00edvalo placebo tablety; stejn\u00ed dobrovoln\u00edci pak \u010dty\u0159i t\u00fddny brali tablety s vysokou koncentrac\u00ed vitaminu B a byli vystaveni vzduchu s vysokou koncentrac\u00ed poletuj\u00edc\u00edch \u010d\u00e1stic PM2,5. V\u011bdci zjistili, \u017ee vitamin sn\u00ed\u017eil n\u011bkter\u00e9 \u0161kodliv\u00e9 \u00fa\u010dinky \u010d\u00e1stic a\u017e o 78 procent.<\/p>\n","protected":false},"excerpt":{"rendered":"
Vitam\u00edn B podle experimentu mezin\u00e1rodn\u00edho v\u011bdeck\u00e9ho t\u00fdmu dok\u00e1\u017ee \u010d\u00e1ste\u010dn\u011b ochr\u00e1nit p\u0159ed onemocn\u011bn\u00edmi zp\u016fsoben\u00fdmi zne\u010di\u0161t\u011bn\u00fdm vzduchem. A\u010dkoli v\u00fdsledky studie jsou povzbudiv\u00e9, v\u011bdci upozor\u0148uj\u00ed, \u017ee experimentu se […]<\/a><\/p>\n<\/div>","protected":false},"author":1,"featured_media":27563,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-27562","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-zpravy"],"_links":{"self":[{"href":"https:\/\/www.invarena.cz\/index.php?rest_route=\/wp\/v2\/posts\/27562","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.invarena.cz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.invarena.cz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.invarena.cz\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.invarena.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=27562"}],"version-history":[{"count":0,"href":"https:\/\/www.invarena.cz\/index.php?rest_route=\/wp\/v2\/posts\/27562\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.invarena.cz\/index.php?rest_route=\/wp\/v2\/media\/27563"}],"wp:attachment":[{"href":"https:\/\/www.invarena.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=27562"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.invarena.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=27562"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.invarena.cz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=27562"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}