{"id":15058,"date":"2026-08-12T03:09:36","date_gmt":"2026-08-12T10:09:36","guid":{"rendered":"https:\/\/cellpeptides.com\/?post_type=product&p=15058"},"modified":"2026-08-12T03:25:58","modified_gmt":"2026-08-12T10:25:58","slug":"buy-foxo4-dri-2mg","status":"publish","type":"product","link":"https:\/\/cellpeptides.com\/sk\/product\/buy-foxo4-dri-2mg\/","title":{"rendered":"FOXO4-DRI 2 mg"},"content":{"rendered":"

FOXO4-DRI je experiment\u00e1lny peptid, ktor\u00fd bol vyvinut\u00fd na \u0161t\u00fadium a potenci\u00e1lne spomalenie procesu starnutia. Je navrhnut\u00fd tak, aby interferoval s interakciou medzi prote\u00ednom FOXO4 a p53, \u010do pom\u00e1ha indukova\u0165 apopt\u00f3zu (programovan\u00fa bunkov\u00fa smr\u0165) v senescentn\u00fdch (starn\u00facich) bunk\u00e1ch, ktor\u00e9 sa prestali deli\u0165, ale neodumreli. Tieto bunky sa \u010dasto naz\u00fdvaj\u00fa \"zombie bunky\" a prispievaj\u00fa k starnutiu tkan\u00edv a r\u00f4znym vekom podmienen\u00fdm ochoreniam.<\/span><\/h2>\n

Toto je syntetick\u00fd peptid tvoren\u00fd 46 aminokyselinami, zlo\u017een\u00fd v\u00fdlu\u010dne z D-aminokysel\u00edn v opa\u010dnom porad\u00ed. Dod\u00e1va sa ako lyofilizovan\u00fd pr\u00e1\u0161ok na laborat\u00f3rne a v\u00fdskumn\u00e9 \u00fa\u010dely. <\/span>iba<\/span><\/i>. Predov\u0161etk\u00fdm sa tento peptid sk\u00fama kv\u00f4li selekt\u00edvnemu odstra\u0148ovaniu senescentn\u00fdch buniek, preto\u017ee dok\u00e1\u017ee preru\u0161i\u0165 v\u00e4zbu s p53 v starn\u00facich bunk\u00e1ch, \u010d\u00edm ich nech\u00e1 zomrie\u0165. Majte v\u0161ak na pam\u00e4ti, \u017ee FOXO4-DRI je zatia\u013e len v \u0161t\u00e1diu predklinick\u00fdch testov a neexistuj\u00fa o \u0148om \u017eiadne \u00fadaje u \u013eud\u00ed. V\u00e4\u010d\u0161ina prehnan\u00fdch tvrden\u00ed o starnut\u00ed a zab\u00edjan\u00ed \u201czombie buniek\u201d je trochu ved\u013ea. K\u013e\u00fa\u010dov\u00fdm zisten\u00edm z jeho aplik\u00e1cie u my\u0161\u00ed bolo, \u017ee obnovil kond\u00edciu, hustotu ssrsti a obli\u010dkov\u00e9 funkcie u r\u00fdchlo starn\u00facich my\u0161\u00ed XpdTTD\/TTD, ako aj u prirodzene starn\u00facich my\u0161\u00ed. \u017diadna \u0161t\u00fadia ho nespom\u00edna ako nie\u010do, \u010do \u201cvracia starnutie sp\u00e4\u0165\u201d.\u201d<\/span><\/p>\n

DRI znamen\u00e1 D-retro-inverso. V podstate to znamen\u00e1 obr\u00e1ten\u00fa sekvenciu alebo zrkadlov\u00fd obraz aminokysel\u00edn. Vedci takto ot\u00e1\u010daj\u00fa sekvencie preto, lebo hoci celkov\u00fd \u00fa\u010dinok zostane rovnak\u00fd, degrad\u00e1cia sa v\u00fdrazne spomal\u00ed. In\u00fdmi slovami, peptidy zlo\u017een\u00e9 z L-aminokysel\u00edn prote\u00e1zy r\u00fdchlo rozlo\u017eia, zatia\u013e \u010do t\u00e1to taktika so zrkadlov\u00fdm obrazom a obr\u00e1tenou sekvenciou zachov\u00e1 topol\u00f3giu postrann\u00fdch re\u0165azcov (tak\u017ee sa st\u00e1le m\u00f4\u017ee norm\u00e1lne viaza\u0165) a z\u00e1rove\u0148 odol\u00e1va degrad\u00e1cii.<\/span><\/p>\n

Interak\u010dn\u00e1 oblas\u0165 prote\u00ednu FOXO4 s p53 bola \u0161tudovan\u00e1 a variant DRI tohto peptidu odvodili Baar a kolegovia v laborat\u00f3riu de Keizer (Cell, 2017). Peptid m\u00e1 bunkovo-penetra\u010dn\u00fd chvost, ktor\u00fd mu umo\u017e\u0148uje prech\u00e1dza\u0165 cez bunkov\u00e9 membr\u00e1ny.<\/span><\/p>\n

Ako funguje FOXO4-DRI?<\/span><\/h2>\n

Ve\u013ea z toho, ako peptidom funguje, z\u00e1vis\u00ed od receptorov. A tak je to aj v tomto pr\u00edpade. Po\u010fme sa v\u0161ak najprv vr\u00e1ti\u0165 o krok sp\u00e4\u0165.<\/span><\/p>\n

Starn\u00face bunky sa naz\u00fdvaj\u00fa senescentn\u00e9 bunky. Tieto bunky sa prestali deli\u0165, s\u00fa ve\u013ek\u00e9 a \u010dasto m\u00f4\u017eu uvo\u013e\u0148ova\u0165 \u0161kodliv\u00e9 z\u00e1palov\u00e9 chemik\u00e1lie a dokonca po\u0161kodzova\u0165 okolit\u00e9 tkaniv\u00e1. V t\u00fdchto bunk\u00e1ch sa hromad\u00ed prote\u00edn naz\u00fdvan\u00fd FOXO4. Navy\u0161e, ke\u010f bunky podst\u00fapia senescenciu vyvolan\u00fa \u017eiaren\u00edm (napr\u00edklad po\u010das chemoterapie), hromad\u00ed sa v nich ve\u013ek\u00e9 mno\u017estvo FOXO4. \u00dalohou FOXO4 je zabr\u00e1ni\u0165 apopt\u00f3ze v t\u00fdchto senescentn\u00fdch bunk\u00e1ch. Ak by ste dok\u00e1zali potla\u010di\u0165 expresiu FOXO4, prirodzene by ste zaznamenali \u00fahyn v\u00e4\u010d\u0161ieho mno\u017estva t\u00fdchto senescentn\u00fdch buniek.<\/span><\/p>\n

To, \u010do FOXO4 rob\u00ed v starn\u00facej bunke, je, \u017ee dr\u017e\u00ed p53 \u2013 prote\u00edn, ktor\u00fd m\u00e1 mnoho \u00faloh, pri\u010dom jednou z nich je vysiela\u0165 sign\u00e1ly smeruj\u00face k smrti, aby bunka mohla zomrie\u0165. K\u00fdm mno\u017estvo FOXO4 dr\u017e\u00ed v\u0161etok tento p53 v senescentn\u00fdch bunk\u00e1ch, ty nezomr\u00fa.<\/span><\/p>\n

Syntetick\u00fd peptid FOXO4-DRI, o ktorom tu hovor\u00edme, s\u00fa\u0165a\u017e\u00ed o v\u00e4zbov\u00e9 miesto. Sna\u017e\u00ed sa naviaza\u0165 na p53 sk\u00f4r, ne\u017e tak urob\u00ed samotn\u00fd bunkov\u00fd prote\u00edn FOXO4. A je v tom celkom \u00faspe\u0161n\u00fd. Zistilo sa, \u017ee tento peptid m\u00e1 vy\u0161\u0161iu afinitu k p53. Ke\u010f\u017ee sme nahradili prirodzen\u00fa v\u00e4zbu FOXO4\/p53 v\u00e4zbou FOXO4-DRI\/p53, v podstate sme zabr\u00e1nili tomu, aby bol p53 viazan\u00fd v jadre. M\u00f4\u017ee sa presun\u00fa\u0165 von a vysiela\u0165 sign\u00e1ly ved\u00face k smrti bunky, preto\u017ee peptid FOXO4-DRI tomu nebr\u00e1ni.<\/span><\/p>\n

T\u00fdm, \u017ee sa peptid navia\u017ee na p53 sk\u00f4r, ne\u017e to dok\u00e1\u017ee prirodzen\u00fd FOXO4, umo\u017e\u0148uje starn\u00facim bunk\u00e1m zomrie\u0165. Ke\u010f\u017ee p nie je naviazan\u00fd na prirodzen\u00fd FOXO4 (ktor\u00fd ho dr\u017e\u00ed v jadre), presunie sa do mitochondri\u00ed a spust\u00ed apopt\u00f3zu. To n\u00e1sledne \u00faplne eliminuje senescentn\u00fa bunku.<\/span><\/p>\n

Tento peptid je zo svojej podstaty selekt\u00edvny, preto\u017ee samotn\u00fd prote\u00edn FOXO4 sa v preva\u017enej v\u00e4\u010d\u0161ine zdrav\u00fdch dospel\u00fdch buniek vyskytuje v n\u00edzkom mno\u017estve. Zv\u00fd\u0161en\u00fd je len v senescentn\u00fdch bunk\u00e1ch.<\/span><\/p>\n

Interakcia FOXO4-p53<\/span><\/h3>\n

Pre\u010do po\u0161koden\u00e9 bunky odmietnu zomrie\u0165? Hromadiace sa po\u0161kodenie DNA za norm\u00e1lnych okolnost\u00ed tla\u010d\u00ed bunku bu\u010f k apopt\u00f3ze, alebo k senescencii. Senescentn\u00e9 bunky urobili t\u00fato druh\u00fa vo\u013ebu a musia toto rozhodnutie neust\u00e1le obhajova\u0165, tak\u017ee \u017eij\u00fa \u010falej. Inak povedan\u00e9, ide o rezistenciu vo\u010di apopt\u00f3ze. T\u00e1to rezistencia vznik\u00e1 prostredn\u00edctvom mnoh\u00fdch faktorov. S\u00fa pripraven\u00e9 zomrie\u0165, ale st\u00e1le sa dr\u017eia. Sekvestr\u00e1cia p53 prote\u00ednom FOXO4 je jedn\u00fdm z mechanizmov, ktor\u00e9 toto zotrv\u00e1vanie zabezpe\u010duj\u00fa.<\/span><\/p>\n

Prirodzene sa zistilo, \u017ee FOXO4 je zv\u00fd\u0161en\u00fd v senescentn\u00fdch bunk\u00e1ch a je k\u013e\u00fa\u010dovou zlo\u017ekou udr\u017eiavania \u017eivotaschopnosti buniek. Dr\u017e\u00ed p53 v jadre, ktor\u00fd by inak vyslal sign\u00e1l na apopt\u00f3zu.<\/span><\/p>\n

FOXO4-DRI a senescentn\u00e9 bunky: Na \u010do sa pou\u017e\u00edva?<\/span><\/h2>\n

Senescencia je stav, v ktorom sa bunka nach\u00e1dza v stave trval\u00e9ho zastavenia. Bunka je pripraven\u00e1 na smr\u0165, ale dr\u017e\u00ed sa \u2013 zost\u00e1va metabolicky akt\u00edvna a taktie\u017e sekretuje. Tieto bunky vytv\u00e1raj\u00fa sekretorick\u00fd fenotyp asociovan\u00fd so senescenciou, pretrv\u00e1vaj\u00faci proz\u00e1palov\u00fd fenotyp, ktor\u00fd m\u00f4\u017ee prispieva\u0165 k zr\u00fdchlen\u00e9mu starnutiu a chemotoxicite.<\/span><\/p>\n

Pr\u00e1ce od roku 2011 uk\u00e1zali, \u017ee odstr\u00e1nenie senescentn\u00fdch buniek m\u00f4\u017ee zabr\u00e1ni\u0165 dysfunkcii tkaniva alebo ju oddiali\u0165 a \u017ee senescentn\u00e9 bunky zaberaj\u00fa miesto zdrav\u00fdch buniek a zhor\u0161uj\u00fa lok\u00e1lnu funkciu, ak nie s\u00fa odstr\u00e1nen\u00e9. Pre\u010do k tomu vlastne doch\u00e1dza? Senescencia toti\u017e nie je jednotne zl\u00e1. Bunkov\u00e1 senescencia m\u00e1 dvojak\u00fa povahu \u2013 v skuto\u010dnosti je prospe\u0161n\u00e1 po\u010das embryon\u00e1lneho v\u00fdvoja, opravy tkan\u00edv a potl\u00e1\u010dania n\u00e1dorov. Je v\u0161ak \u0161kodliv\u00e1 pri chronickom strese, pretrv\u00e1vaj\u00facom poranen\u00ed tkaniva a zhor\u0161enom \u010disten\u00ed.<\/span><\/p>\n

V\u00fdskum bunkov\u00e9ho starnutia<\/span><\/h3>\n

FOXO4-DRI sa sk\u00fama najm\u00e4 ako experiment\u00e1lny senolytick\u00fd peptid, ktor\u00fd sa odli\u0161uje od malomolekulov\u00fdch senolyt\u00edk. P\u00f4vodn\u00fd in-vitro model vyu\u017e\u00edval \u013eudsk\u00e9 fibroblasty IMR90 so senescenciou indukovanou ionizuj\u00facim \u017eiaren\u00edm. K\u013e\u00fa\u010dov\u00fd v\u00fdsledok? Vynikaj\u00faca selektivita. Mnoho neskor\u0161\u00edch v\u00fdskumn\u00fdch skup\u00edn navy\u0161e tento peptid pou\u017eilo ako sondu naprie\u010d r\u00f4znymi typmi buniek, od fibroblastov IMR90 a Leydigov\u00fdch buniek TM3 a\u017e po chondrocyty, endotelov\u00e9 bunky a p\u013e\u00facne fibroblasty.<\/span><\/p>\n

V\u00fdskum funkci\u00ed s\u00favisiacich s vekom<\/span><\/h3>\n

\u0160t\u00fadie na zvierat\u00e1ch uk\u00e1zali zlep\u0161enie fyzickej aktivity, stavu srsti, obli\u010dkov\u00fdch markerov a funkcie tkan\u00edv. V p\u00f4vodnej pr\u00e1ci sa nach\u00e1dzaj\u00fa dva k\u013e\u00fa\u010dov\u00e9 modely: r\u00fdchlo starn\u00faci kme\u0148 s deficienciou opravy DNA a prirodzene starn\u00face my\u0161i. V\u00fdsledky boli konzistentn\u00e9 u oboch. Aktivita na be\u017eeckom kolese a sk\u00f3re srsti sa hodnotili u 26-t\u00fd\u017ed\u0148ov\u00fdch my\u0161\u00ed divok\u00e9ho typu a XpdTTD\/TTD, pri\u010dom zabehnut\u00e1 vzdialenos\u0165 sa meria v km za de\u0148. \u0160t\u00fadia taktie\u017e informovala o zn\u00ed\u017eenom v\u00fdskyte spont\u00e1nne vznikaj\u00facej ren\u00e1lnej glomeruloskler\u00f3zy a zlep\u0161enej filtra\u010dnej schopnosti obli\u010diek u r\u00fdchlo starn\u00facich my\u0161\u00ed.<\/span><\/p>\n

V\u00fdskum reproduk\u010dn\u00e9ho starnutia<\/span><\/h3>\n

Uskuto\u010dnili sa dve samostatn\u00e9 \u010d\u00ednske \u0161t\u00fadie od tej istej skupiny. V prvej (Zhang et al. 2020) zlep\u0161en\u00e9 markery preuk\u00e1zali zv\u00fd\u0161en\u00fd s\u00e9rov\u00fd testoster\u00f3n, zv\u00fd\u0161en\u00e9 3\u03b2-HSD a CYP11A1, zn\u00ed\u017een\u00fa interstici\u00e1lnu aktivitu SA-\u03b2-gal, ni\u017e\u0161ie p53, p21 a p16 a zn\u00ed\u017een\u00e9 IL-1\u03b2, IL-6 a TGF-\u03b2. Druh\u00e1 \u0161t\u00fadia (Li et al. 2024) mala in\u00fd dizajn a dlh\u0161iu expoz\u00edciu. Uv\u00e1dzan\u00fdm v\u00fdsledkom bola zv\u00fd\u0161en\u00e1 kvalita spermi\u00ed a zlep\u0161en\u00e1 spermatogen\u00e9za u lie\u010den\u00fdch star\u00fdch my\u0161\u00ed, pri\u010dom navrhovan\u00fdm mechanizmom bola zn\u00ed\u017een\u00e1 sekr\u00e9cia SASP z Leydigov\u00fdch buniek.\u00a0<\/span><\/p>\n

V\u00fdskum fibr\u00f3zy a tkan\u00edv<\/span><\/h3>\n

V\u00fdskumn\u00edci tie\u017e sk\u00famali FOXO4-DRI v experiment\u00e1lnych modeloch p\u013e\u00facnej fibr\u00f3zy, chrupaviek a starnutia ciev.<\/span><\/p>\n