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U etogo termina sushestvuyut i drugie znacheniya sm Priony znacheniya Ne sleduet putat s preonami gipoteticheskimi elementarnymi chasticami Prio ny angl prion ot protein belok infection infekciya slovo bylo predlozheno v 1982 godu Stenli Pruzinerom osobyj klass infekcionnyh patogenov ne soderzhashih nukleinovyh kislot Priony predstavlyayut soboj belki s anomalnoj tretichnoj strukturoj Eto polozhenie lezhit v osnove prionnoj gipotezy odnako naschyot sostava prionov sushestvuyut i drugie tochki zreniya PrionyGistologicheskij preparat tkan lobnoj doli golovnogo mozga bolnogo boleznyu Krejtcfeldta YakobaMKB 11 XN7AMMKB 10 A81MKB 9 046MeSH D011328 Mediafajly na Vikisklade Priony sposobny uvelichivat svoyu chislennost ispolzuya funkcii zhivyh kletok v etom otnoshenii priony shozhi s virusami Prion sposoben katalizirovat konformacionnoe prevrashenie gomologichnogo emu normalnogo kletochnogo belka v sebe podobnyj prion Kak pravilo pri perehode belka v prionnoe sostoyanie ego a spirali prevrashayutsya v b sloi Poyavivshiesya v rezultate takogo perehoda priony mogut v svoyu ochered perestraivat novye molekuly belka takim obrazom zapuskaetsya cepnaya reakciya v hode kotoroj obrazuetsya ogromnoe kolichestvo nepravilno svyornutyh molekul Priony edinstvennye izvestnye infekcionnye agenty razmnozhenie kotoryh proishodit bez uchastiya nukleinovyh kislot Vse izvestnye priony vyzyvayut formirovanie belkovyh agregatov vklyuchayushih plotno upakovannye b sloi Amiloidy predstavlyayut soboj fibrilly rastushie na koncah a razlom fibrilly privodit k poyavleniyu chetyryoh rastushih koncov Inkubacionnyj period prionnogo zabolevaniya opredelyaetsya skorostyu eksponencialnogo rosta kolichestva prionov a ona v svoyu ochered zavisit ot skorosti linejnogo rosta i fragmentacii agregatov fibrill Dlya razmnozheniya priona neobhodimo ishodnoe nalichie normalno ulozhennogo kletochnogo prionnogo belka organizmy u kotoryh otsutstvuet normalnaya forma prionnogo belka ne stradayut prionnymi zabolevaniyami Prionnaya forma belka chrezvychajno stabilna i nakaplivaetsya v porazhyonnoj tkani vyzyvaya eyo povrezhdenie i v konechnom schyote otmiranie Stabilnost prionnoj formy oznachaet chto priony ustojchivy k denaturacii pod dejstviem himicheskih i fizicheskih agentov poetomu unichtozhit eti chasticy ili sderzhat ih rost tyazhelo Priony sushestvuyut v neskolkih formah shtammah kazhdyj so slegka otlichnoj strukturoj Priony vyzyvayut zabolevaniya transmissivnye gubchatye encefalopatii TGE u razlichnyh mlekopitayushih v tom chisle gubchatuyu encefalopatiyu krupnogo rogatogo skota korove beshenstvo U cheloveka priony vyzyvayut bolezn Krejtcfeldta Yakoba variant bolezni Krejtcfeldta Yakoba vCJD sindrom Gerstmana Shtrausslera Shejnkera fatalnuyu semejnuyu bessonnicu i kuru Vse izvestnye prionnye zabolevaniya porazhayut golovnoj mozg i drugie nervnye tkani v nastoyashee vremya neizlechimy i v konechnom itoge smertelny Vse izvestnye prionnye zabolevaniya mlekopitayushih vyzyvayutsya belkom PrP Ego forma s normalnoj tretichnoj strukturoj nazyvaetsya PrPC ot angl common obychnyj ili cellular kletochnyj a infekcionnaya anomalnaya forma nazyvaetsya PrPd ot angl disease bolezn a takzhe vstrechayutsya varianty PrPSc ot angl scrapie skrepi pochesuha ovec odno iz pervyh zabolevanij s ustanovlennoj prionnoj prirodoj ili PrPTSE ot angl Transmissible Spongiform Encephalopathies V zarubezhnoj literature vstrechayutsya sokrasheniya s ukazaniem na priony poluchennye ot konkretnogo vida t e iz tkanej opredelyonnogo zhivotnogo ili cheloveka PrPSc PrPBSE PrPCJD PrPCWD PrPSSE ot ovec korov cheloveka olenej koshek Belki obrazuyushie priony obnaruzheny i u nekotoryh gribov Bolshinstvo prionov gribov ne imeyut zametnogo otricatelnogo vliyaniya na vyzhivaemost no do sih por idyot diskussiya o roli gribnyh prionov v fiziologii organizma hozyaina i roli v evolyucii Vyyasnenie mehanizmov razmnozheniya prionov gribov okazalos vazhnym dlya ponimaniya analogichnyh processov u mlekopitayushih V 2016 godu poyavilos soobshenie o nalichii u rasteniya Arabidopsis thaliana rezuhovidka Talya belkov s prionnymi svojstvami IstoriyaOpisanie prionnyh zabolevanij Gans Gerhard Krejcfeldt 1885 1964 Pervaya otkrytaya transmissivnaya gubchataya encefalopatiya pochesuha ovec skrepi Pervye eyo sluchai byli otmecheny v Velikobritanii v 1700 h godah Pri etom zabolevanii ovcy stradali ot silnejshego zuda iz za chego zhivotnym prihodilos nepreryvno teretsya angl scrape o derevya otkuda i poshlo nazvanie bolezni Krome etogo ovcy ispytyvali bol pri dvizhenii nogami i stradali ot silnejshih pripadkov Vse eti simptomy yavlyayutsya klassicheskimi priznakami povrezhdeniya mozga i eta strannaya bolezn vvodila uchyonyh v zabluzhdenie Gorazdo pozzhe v 1967 godu Chandler angl Chandler ustanovil chto skrepi mogut bolet i myshi chto nesomnenno bylo progressom v izuchenii etogo zabolevaniya V XX om veke byli opisany i prionnye zabolevaniya cheloveka V 1920 h godah Gans Gerhard Krejcfeldt i Alfons Mariya Yakob issledovali novoe neizlechimoe zabolevanie nervnoj sistemy cheloveka glavnym priznakom kotorogo bylo obrazovanie polostej v tkani mozga Vposledstvii eta bolezn byla nazvana ih imenem V 1957 godu Karlton Gajduzek i Vinsent Zigas opisali nevrologicheskij sindrom rasprostranyonnyj u naroda fore zhivushego v vysokogoryah Papua Novoj Gvinei Eta bolezn harakterizovalas tremorom ataksiej na rannih stadiyah atetoidnymi dvizheniyami K etim simptomam vposledstvii pribavlyalas slabost demenciya bolezn neizbezhno zakanchivalas letalnym ishodom Na yazyke fore eta bolezn nazyvaetsya kuru chto v perevode oznachaet drozh ili porcha pod etim nazvaniem eta bolezn izvestna i segodnya Okazalos chto prichinoj rasprostraneniya kuru byl neredkij sredi fore ritualnyj kannibalizm V hode religioznyh ritualov oni poedali organy ubityh rodichej Mozg pri etom eli deti poskolku schitalos chto ot nego u detej pribavlyalos uma Inkubacionnyj period zabolevaniya mozhet sostavlyat do 50 let odnako u devushek osobenno podverzhennyh kuru on mozhet sostavlyat vsego lish 4 goda ili menee Za otkrytie infekcionnogo haraktera bolezni kuru Karlton Gajduzek byl udostoen Nobelevskoj premii po fiziologii ili medicine v 1976 godu Razvitie predstavlenij o prionah Stenli Pruziner r 1942 pervootkryvatel prionov V 1960 h godah v Londone dva issledovatelya radiobiolog angl i biofizik vydvinuli gipotezu chto nekotorye transmissivnye gubchatye encefalopatii vyzyvayutsya patogenami sostoyashimi isklyuchitelno iz belkov Alper i Griffit takim obrazom pytalis obyasnit tot fakt chto tainstvennyj infekcionnyj agent vyzyvayushij pochesuhu ovec i bolezn Krejtcfeldta Yakoba ochen ustojchiv k ioniziruyushemu izlucheniyu Doza radiacii neobhodimaya dlya unichtozheniya poloviny chastic infekcionnogo agenta zavisit ot ih razmera chem menshe takaya chastica tem menshe veroyatnost popadaniya v neyo zaryazhennoj chasticy Tak i bylo ustanovleno chto prion slishkom mal dlya virusa Frensis Krik priznal vazhnost belkovoj gipotezy Griffita dlya obyasneniya rasprostraneniya pochesuhi ovec vo vtorom izdanii Centralnoj dogmy molekulyarnoj biologii 1970 Hotya Krik otstaival tochku zreniya chto potok informacii ot belka k belku ili ot belka k DNK ili RNK nevozmozhen on zametil chto gipoteza Griffita soderzhala vozmozhnoe tomu protivorechie odnako sam Griffit svoyu gipotezu tak ne rassmatrival Pozzhe on sformuliroval svoyu utochnyonnuyu gipotezu s uchyotom sushestvovaniya obratnoj transkripcii otkrytoj v 1970 godu Dejvidom Baltimorom i Houardom Teminom V 1982 godu Stenli Pruziner iz Kalifornijskogo universiteta v San Francisko soobshil chto ego gruppa vydelila gipoteticheskij infekcionnyj agent prion i chto on sostoit v osnovnom iz odnogo belka hotya oni izolirovali etot belok tolko cherez 2 goda posle soobsheniya Stenli Pruzinera Za svoi issledovaniya v oblasti prionov Pruziner v 1997 godu byl udostoen Nobelevskoj premii po fiziologii ili medicine StrukturaIzoformy Struktura 23 230 aminokislot belka obrazuyushego prion privodyashij k gubchatoj encefalopatii krupnogo rogatogo skota Belok iz kotorogo sostoyat priony PrP mozhno najti vo vseh chastyah tela u zdorovyh lyudej i zhivotnyh Odnako v porazhyonnyh tkanyah prisutstvuet PrP imeyushij anomalnuyu strukturu i ustojchivyj k proteazam fermentam gidrolizuyushim belki Kak skazano vyshe normalnaya forma nazyvaetsya PrPC a infekcionnaya PrPSc Pri opredelyonnyh usloviyah mozhno dostich svorachivaniya bolee ili menee strukturirovannyh izoform PrP in vitro kotorye sposobny k zarazheniyu zdorovyh organizmov hotya i s menshej stepenyu effektivnosti chem vydelennyj iz bolnyh organizmov PrPC PrPC normalnyj membrannyj belok mlekopitayushih kotoryj u cheloveka kodiruetsya genom PRNP mRNK PRNP cheloveka kodiruet polipeptid dlinoj 253 aminokislotnyh ostatka a o kotoryj v processe sozrevaniya ukorachivaetsya kletochnymi fermentami Zrelaya forma PrP sostoit iz 208 aminokislotnyh ostatkov i imeet molekulyarnuyu massu 35 36 kDa Pomimo ogranichennogo proteoliza PrP podvergaetsya i drugim posttranslyacionnym modifikaciyam N glikozilirovaniyu po polozheniyam Asn 181 i Asn 197 prisoedineniyu glikozilfosfatidilinozitola k Ser 230 i obrazovaniyu disulfidnoj svyazi mezhdu Cys 179 i Cys 214 Aminokislotnye ostatki vovlechyonnye vo vse perechislennye posttranslyacionnye modifikacii vysoko konservativny u mlekopitayushih V prostranstvennoj strukture PrP vydelyayut nestrukturirovannyj N koncevoj uchastok a o 23 125 u cheloveka i globulyarnyj domen a o 126 231 sostoyashij iz tryoh a spiralej i dvuhcepochechnogo antiparallelnogo b lista Izvestno neskolko topologicheskih form PrP po otnosheniyu k membrane dve transmembrannye i odna zakreplyonnaya na membrane glikolipidnym yakorem Obrazovanie PrPC proishodit v EPR dalnejshee sozrevanie v komplekse Goldzhi otkuda on pri pomoshi membrannyh vezikul dostavlyaetsya k plazmaticheskoj membrane Posle etogo on libo zakreplyaetsya na membrane posle razrusheniya endosomy libo zhe podvergaetsya endocitozu i razrushaetsya v lizosomah V otlichie ot normalnoj rastvorimoj formy belka priony osazhdayutsya vysokoskorostnym centrifugirovaniem chto yavlyaetsya standartnym testom na nalichie prionov PrPC obladaet vysokim srodstvom k kationam dvuhvalentnoj medi Znachenie etogo fakta neyasno no vozmozhno eto imeet kakoe to otnoshenie k ego strukture ili funkciyam Est dannye chto PrP igraet vazhnuyu rol v prikreplenii kletok peredache vnutrikletochnyh signalov a potomu mozhet byt vovlechyon v kommunikaciyu kletok mozga Tem ne menee funkcii PrP issledovany nedostatochno PrPSc Infekcionnaya izoforma PrP PrPSc sposobna prevrashat normalnyj belok PrPC v infekcionnuyu izoformu izmenyaya ego konformaciyu to est tretichnuyu strukturu eto v svoyu ochered izmenyaet vzaimodejstviya PrP s drugimi belkami Hotya tochnaya prostranstvennaya struktura PrPSc neizvestna ustanovleno chto v nej vmesto a spiralej preobladayut b sloi Takie nenormalnye izoformy obedinyayutsya v vysokostrukturirovannye amiloidnye volokna kotorye skaplivayas formiruyut blyashki Neyasno yavlyayutsya li eti obrazovaniya prichinoj povrezhdeniya kletok ili vsego lish pobochnym produktom patologicheskogo processa Konec kazhdogo volokna sluzhit svoego roda zatravkoj k kotoroj mogut prikreplyatsya svobodnye belkovye molekuly v rezultate chego fibrilla rastyot V bolshinstve sluchaev prisoedinyatsya mogut tolko molekuly PrP identichnye po pervichnoj strukture PrPSc poetomu obychno peredacha prionov vidospecifichna Odnako vozmozhny i sluchai mezhvidovoj peredachi prionov Mehanizm razmnozheniya prionovGeterodimernaya model razmnozheniya prionovFibrillyarnaya model razmnozheniya prionov Pervoj gipotezoj obyasnyayushej razmnozhenie prionov bez uchastiya drugih molekul v chastnosti nukleinovyh kislot byla geterodimernaya model Soglasno etoj gipoteze odna molekula PrPSc prisoedinyaetsya k odnoj molekule PrPC i kataliziruet eyo perehod v prionnuyu formu Dve molekuly PrPSc posle etogo rashodyatsya i prodolzhayut prevrashat drugie PrPC v PrPSc Odnako model razmnozheniya replikacii prionov dolzhna obyasnyat ne tolko mehanizm razmnozheniya prionov no i to pochemu spontannoe poyavlenie prionov stol redko Manfred Ejgen lat Manfred Eigen pokazal chto geterodimernaya model trebuet chtoby PrPSc byl fantasticheski effektivnym katalizatorom on dolzhen povyshat chastotu obrasheniya normalnogo belka v prionnuyu formu v 1015 raz Takoj problemy ne voznikaet esli dopustit chto PrPSc sushestvuet tolko v agregirovannoj naprimer amiloidnoj forme gde kooperativnost vystupaet kak barer dlya spontannogo perehoda v prionnuyu formu Vdobavok k etomu nesmotrya na prilozhennye usiliya vydelit monomernyj PrPSc tak i ne udalos Alternativnaya fibrillyarnaya model predpolagaet chto PrPSc sushestvuet tolko v vide fibrill pri etom koncy fibrill svyazyvayut PrPS gde on prevrashaetsya v PrPSc Esli by eto bylo tolko tak to chislennost prionov vozrastala by linejno Odnako po mere razvitiya prionnogo zabolevaniya nablyudaetsya eksponencialnyj rost kolichestva PrPSc i obshej koncentracii infekcionnyh chastic Eto mozhno obyasnit esli prinyat vo vnimanie razlom fibrill V organizme razlamyvanie fibrill osushestvlyaetsya belkami shaperonami kotorye obychno pomogayut ochistit kletku ot agregirovannyh belkov Skorost rosta chisla infekcionnyh chastic prionov v znachitelnoj mere opredelyaetsya velichinoj kvadratnogo kornya iz koncentracii PrPSc Prodolzhitelnost inkubacionnogo perioda opredelyaetsya skorostyu rosta i eto podtverzhdaetsya issledovaniyami in vivo na transgennyh myshah Takaya zhe korennaya zavisimost nablyudaetsya v eksperimentah s razlichnymi amiloidnymi belkami in vitro Mehanizm replikacii prionov imeet znachenie dlya razrabotki lekarstv Poskolku inkubacionnyj period prionnyh zabolevanij chrezvychajno dolog effektivnomu lekarstvu vovse neobyazatelno unichtozhit vse priony dostatochno lish snizit skorost eksponencialnogo rosta ih kolichestva Modelirovanie predskazyvaet chto samym effektivnym preparatom byl by takoj kotoryj svyazyvaetsya s koncami fibrill i blokiruet ih rost Funkcii PrPOdnim iz obyasnenij nejrodegeneracii vyzyvaemoj prionami mozhet byt narushenie funkcionirovaniya Odnako normalnaya funkciya etogo belka izuchena ploho Dannye in vitro ukazyvayut na mnozhestvo raznoobraznyh rolej a eksperimenty na myshah nokautnyh po etomu genu dali otnositelno nemnogo informacii poskolku u etih zhivotnyh nablyudalis lish malye otkloneniya ot normy Nedavnie issledovaniya provedyonnye na myshah pokazali chto rassheplenie PrP v perifericheskih nervah aktiviruet vosstanovlenie ih mielinovogo sloya shvannovskimi kletkami i chto otsutstvie PrP privodit k demielinizacii nervov V 2005 godu bylo vydvinuto predpolozhenie chto v norme PrP igraet rol v podderzhanii dolgovremennoj pamyati Krome togo u myshej lishyonnyh gena Prnp nablyudaetsya izmenyonnaya gippokampalnaya dolgovremennaya potenciaciya V 2006 godu uchyonye iz pokazali chto ekspressiya gena Prnp v gemopoeticheskih stvolovyh kletkah neobhodima dlya samopodderzhaniya kostnogo mozga V issledovanii bylo vyyavleno chto dolgozhivushie gemopoeticheskie stvolovye kletki nesut PrP na kletochnoj membrane a krovetvornye tkani so stvolovymi kletkami lishyonnymi PrP imeyut bolshuyu chuvstvitelnost k kletochnomu istosheniyu Gipotezy o sostave prionovSoglasno naibolee ustoyavshejsya tochke zreniya priony predstavlyayut soboj chisto belkovye infekcionnye agenty Odnako u etoj gipotezy chisto belkovoj gipotezy imeyutsya svoi nedostatki v svyazi s chem poyavilis i alternativnye mneniya o sushnosti prionov Vse perechislennye gipotezy rassmatrivayutsya nizhe Chisto belkovaya gipoteza Do otkrytiya prionov schitalos chto vse infekcionnye agenty ispolzuyut dlya razmnozheniya nukleinovye kisloty Chisto belkovaya gipoteza postuliruet chto belkovaya struktura mozhet razmnozhatsya bez uchastiya nukleinovyh kislot Pervonachalno schitalos chto eta gipoteza protivorechit centralnoj dogme molekulyarnoj biologii soglasno kotoroj nukleinovye kisloty sluzhat edinstvennym sposobom peredachi nasledstvennoj informacii odnako v nastoyashee vremya schitaetsya chto hotya priony sposobny k perenosu informacii bez uchastiya nukleinovyh kislot oni nesposobny peredavat informaciyu na nukleinovye kisloty Dokazatelstva govoryashie v polzu chisto belkovoj gipotezy prionnye zabolevaniya ne udalos dostoverno svyazat ni s virusnymi ni s bakterialnymi ni s gribkovymi vozbuditelyami hotya u drozhzhej Saccharomyces cerevisiae izvestny neletalnye priony naprimer sm priony gribov infektivnost prionov naskolko izvestno ne svyazana s nukleinovymi kislotami priony ustojchivy k nukleazam i ultrafioletovomu izlucheniyu gubitelno skazyvayushihsya na nukleinovyh kislotah u organizma zarazhyonnogo prionom ot drugogo vida ne obnaruzhivaetsya PrPSc s aminokislotnoj posledovatelnostyu priona vida donora Sledovatelno replikacii priona donora ne proishodit v semyah s mutaciej gena PrP imeyut mesto nasledstvennye prionnye zabolevaniya U myshej s mutaciej etogo gena tozhe razvivaetsya prionnoe zabolevanie nesmotrya na zhyostkij kontrol uslovij soderzhaniya isklyuchayushij zarazhenie izvne zhivotnye ne imeyushie belka PrPC ne podverzheny prionnym zabolevaniyam v 2018 godu v iskusstvennyh usloviyah v otsutstvie NK byli polucheny rekombinantnye izoformy PrPd ot disease bolezn Multikomponentnaya gipoteza Nizkaya infekcionnost prionov poluchennyh iz chistogo belka in vitro privela k poyavleniyu tak nazyvaemoj multikomponentnoj gipotezy kotoraya postuliruet chto dlya obrazovaniya infekcionnogo priona trebuyutsya drugie molekuly kofaktory V 2007 godu biohimik Surachai Supattapone i ego kollegi iz Dartmutskogo kolledzha poluchili ochishennye infekcionnye priony iz PrPC soochishayushihsya lipidov s belkom i sinteticheskoj polianionnoj molekuly Oni takzhe pokazali chto polianionnaya molekula potrebovavshayasya dlya obrazovaniya priona obladala vysokim srodstvom k PrP i obrazovyvala s nim kompleksy Eto dalo im osnovaniya predpolozhit chto v sostav infekcionnogo priona vhodit ne tolko belok no i drugie molekuly organizma v tom chisle lipidy i polianionnye molekuly V 2010 godu Jiyan Ma s kollegami iz Universiteta shtata Ogajo poluchili infekcionnyj prion iz sintezirovannogo bakterialnymi kletkami rekombinantnogo PrP fosfolipida POPG i RNK chto tozhe podtverzhdaet multikomponentnuyu gipotezu Naprotiv v drugih eksperimentah iz odnogo tolko rekombinantnogo PrP udalos poluchit tolko slaboinfektivnye priony V 2012 godu Supattapone i kollegi vydelili membrannyj lipid kak endogennyj kofaktor kotoryj sposoben katalizirovat formirovanie bolshogo kolichestva rekombinantnyh prionov razlichnyh shtammov bez uchastiya drugih molekul Oni takzhe soobshili chto etot kofaktor neobhodim dlya podderzhaniya infekcionnoj konformacii PrPSc a takzhe opredelyaet shtammovye svojstva infekcionnyh prionov Virusnaya gipoteza Chisto belkovaya gipoteza vstretila kritiku so storony teh kto schitaet chto prostejshim obyasneniem prionnyh zabolevanij yavlyaetsya ih virusnaya priroda Bolee desyati let nevrolog Jelskogo universiteta Laura Manuelidis angl Laura Manuelidis pytaetsya dokazat chto prionnye zabolevaniya vyzyvayutsya neizvestnym medlennym virusom V yanvare 2007 goda ona i eyo kollegi soobshili chto obnaruzhili virus v 10 ili menee kletok zarazhyonnyh skrepi v kulture Virusnaya gipoteza utverzhdaet chto TGE vyzyvayutsya sposobnymi k replikacii informacionnymi molekulami skoree vsego nukleinovymi kislotami svyazyvayushimisya s Izvestny shtammy prionov pri TGE v tom chisle gubchatoj encefalopatii krupnogo rogatogo skota i skrepi kotorye harakterizuyutsya specificheskimi biologicheskimi svojstvami chto po mneniyu storonnikov virusnoj gipotezy ne obyasnyaetsya chisto belkovoj gipotezoj Argumenty govoryashie v polzu virusnoj gipotezy variacii mezhdu shtammami priony razlichayutsya po infektivnosti inkubacionnomu periodu simptomatike i skorosti razvitiya zabolevaniya chto napominaet razlichiya mezhdu virusami osobenno RNK soderzhashimi virusami virusy soderzhashie RNK v kachestve edinstvennogo nasledstvennogo materiala dolgij inkubacionnyj period i bystroe razvitie simptomov prionnyh boleznej napominaet lentivirusnuyu infekciyu Naprimer shozhim obrazom protekaet VICh inducirovannyj SPID v nekotoryh kletkah linij zarazhyonnyh skrepi ili boleznyu Krejtcfeldta Yakoba byli najdeny virusopodobnye chasticy ne sostoyashie iz PrP Nedavnie issledovaniya rasprostraneniya gubchatoj encefalopatii krupnogo rogatogo skota v beskletochnyh sistemah i v himicheskih reakciyah s ochishennymi komponentami chyotko svidetelstvuyut protiv virusnoj prirody etogo zabolevaniya Krome togo protiv virusnoj gipotezy govorit i vysheupomyanutaya rabota Jiyan Ma Prionnye zabolevaniyaPreparat golovnogo mozga korovy porazhyonnoj korovim beshenstvom V serom veshestve obrazuyutsya mikroskopicheskie polosti kotorye pridayut tkani vid gubkiZabolevaniya vyzyvaemye prionami Porazhaemye zhivotnye Zabolevaniyaovcy kozy skrepikorovy gubchataya encefalopatiya krupnogo rogatogo skota GEKRS ili korove beshenstvonorki TME belohvostyj olen vapiti losi chernohvostyj olen CWD koshki FSE antilopa nyala oriks bolshoj kudu EUE straus Gubchataya encefalopatiya sluchai peredachi ne zafiksirovany chelovek bolezn Krejtcfeldta Yakoba CJD Yatrogennaya bolezn Krejtcfeldta Yakoba iCJD variant bolezni Krejtcfeldta Yakoba vCJD nasledstvennaya bolezn Krejtcfeldta Yakoba fCJD sporadicheskaya bolezn Krejtcfeldta Yakoba sCJD sindrom Gerstmana Shtrausslera Shejnkera GSS Fatalnaya semejnaya bessonnica FFI Kuru Priony vyzyvayut nejrodegenerativnye zabolevaniya tak kak obrazuyut vnekletochnye skopleniya v centralnoj nervnoj sisteme i formiruyut amiloidnye blyashki kotorye razrushayut normalnuyu strukturu tkani Razrushenie harakterizuetsya obrazovaniem dyr polostej v tkani i tkan prinimaet gubchatuyu strukturu iz za formirovaniya vakuolej v nejronah Drugie nablyudaemye pri etom gistologicheskie izmeneniya uvelichenie chislennosti astrocitov iz za razrusheniya blizlezhashih nejronov i otsutstvie vospalitelnyh reakcij Hotya inkubacionnyj period prionnyh zabolevanij kak pravilo ochen dolog posle poyavleniya simptomov bolezn progressiruet bystro privodya k razrusheniyu mozga i smerti Proyavlyayushimisya pri etom nejrodegenerativnymi simptomami mogut byt konvulsii demenciya ataksiya rasstrojstvo koordinacii dvizhenij povedencheskie i lichnostnye izmeneniya Vse izvestnye prionnye zabolevaniya obedinyaemye pod nazvaniem transmissivnye gubchatye encefalopatii TGE neizlechimy i fatalny Dlya myshej byla razrabotana specialnaya vakcina vozmozhno eto pomozhet razrabotat vakcinu protiv prionnyh zabolevanij i dlya cheloveka Krome togo v 2006 godu uchyonye zayavili chto metodami gennoj inzhenerii imi byla poluchena korova lishyonnaya neobhodimogo dlya obrazovaniya prionov gena to est teoreticheski ona obladaet immunitetom k TGE Etot vyvod osnovan na rezultatah issledovaniya chto myshi lishyonnye prionnogo belka v normalnoj forme proyavlyali ustojchivost k prionu skrepi Priony porazhayut mnozhestvo razlichnyh vidov mlekopitayushih i belok PrP ochen shozh u vseh mlekopitayushih Iz za nebolshih razlichij mezhdu PrP u razlichnyh vidov dlya prionnoj bolezni peredacha ot odnogo vida k drugomu neobychna istochnik ne ukazan 3958 dnej Odnako variant chelovecheskogo prionnogo zabolevaniya bolezni Krejtcfeldta Yakoba vyzyvaetsya prionom obychno porazhayushim korov i vyzyvayushim gubchatuyu encefalopatiyu krupnogo rogatogo skota kotoryj peredayotsya cherez zarazhyonnoe myaso Puti vozniknoveniya Schitaetsya chto prionnoe zabolevanie mozhet byt priobreteno 3 putyami v sluchae pryamogo zarazheniya nasledstvenno ili sporadicheski spontanno V nekotoryh sluchayah dlya razvitiya bolezni trebuetsya kombinaciya etih faktorov Naprimer dlya razvitiya skrepi neobhodimo kak zarazhenie tak i opredelyonnaya genotipom chuvstvitelnost V bolshinstve sluchaev prionnye zabolevaniya voznikayut spontanno po nevyyasnennym prichinam Na dolyu nasledstvennyh zabolevanij prihoditsya okolo 15 vseh sluchaev Nakonec menshinstvo yavlyayutsya rezultatom dejstviya okruzhayushej sredy to est imeyut yatrogennuyu prirodu ili poyavlyayutsya v rezultate prionnogo zarazheniya Spontannoe vozniknovenie Sporadicheskaya to est spontannaya prionnaya bolezn voznikaet v populyacii u sluchajnoj osobi Takov naprimer klassicheskij variant bolezni Krejtcfeldta Yakoba Sushestvuyut 2 osnovnye gipotezy otnositelno spontannogo poyavleniya prionnyh boleznej Soglasno pervoj iz nih spontannoe izmenenie proishodit v samom dosele normalnom belke v mozge to est imeet mesto posttranslyacionnaya modifikaciya Alternativnaya gipoteza glasit chto odna ili neskolko kletok organizma v kakoj to moment preterpevayut somaticheskuyu mutaciyu to est ne peredayushuyusya nasledstvenno i nachinayut proizvodit defektnyj belok PrPSc Kak by to ni bylo konkretnyj mehanizm spontannogo vozniknoveniya prionnyh boleznej neizvesten Nasledstvennost Lokalizaciya gena PRNPOsnovnaya statya PRNP Byl identificirovan gen kodiruyushij normalnyj belok PRNP lokalizovannyj na 20 j hromosome Pri vseh nasledstvennyh prionnyh zabolevaniyah imeet mesto mutaciya etogo gena Bylo vydeleno mnogo razlichnyh mutacij okolo 30 etogo gena i poluchayushiesya pri etom mutantnye belki bolee sklonny k ukladke v nenormalnuyu prionnuyu formu Vse takie mutacii nasleduyutsya autosomno dominantno Eto otkrytie pokazalo dyru v obshej teorii prionov glasyashej chto priony mogut perevodit v prionnuyu formu tolko belki identichnogo aminokislotnogo sostava Mutacii mogut imet mesto po vsemu genu Nekotorye mutacii privodyat k rastyazheniyu oktapeptidnyh povtorov na N konce belka Drugie mutacii privodyashie k poyavleniyu nasledstvennoj prionnoj bolezni mogut proishodit v poziciyah 102 117 i 198 sindrom Gerstmana Shtrausslera Shejnkera 178 200 210 i 232 bolezn Krejtcfeldta Yakoba i 178 fatalnaya semejnaya bessonnica Zarazhenie Po dannym sovremennyh issledovanij osnovnoj put priobreteniya prionnyh zabolevanij poedanie zarazhyonnoj pishi Schitaetsya chto priony mogut ostavatsya v okruzhayushej srede v ostankah myortvyh zhivotnyh a takzhe prisutstvuyut v moche slyune i drugih zhidkostyah i tkanyah tela Iz za etogo zarazhenie prionami mozhet proizojti i v hode polzovaniya nesterilnymi hirurgicheskimi instrumentami ob etom sm razdel Sterilizaciya Oni takzhe mogut dolgo sohranyatsya v pochve za schyot svyazyvaniya s glinoj i drugimi pochvennymi mineralami Gruppa issledovatelej iz Kalifornijskogo universiteta vo glave s nobelevskim laureatom Stenli Pruzinerom dokazala chto prionnaya infekciya mozhet razvitsya iz prionov soderzhashihsya v navoze A poskolku navoz prisutstvuet vokrug mnogih vodoyomov i na pastbishah eto dayot vozmozhnost dlya shirokogo rasprostraneniya prionnyh boleznej V 2011 godu bylo soobsheno ob otkrytii prionov peredayushihsya po vozduhu v chasticah aerozolya to est vozdushno kapelnym putyom Eto otkrytie bylo sdelano v hode eksperimenta na zarazhyonnyh skrepi myshah Takzhe v 2011 godu bylo opublikovano predvaritelnoe dokazatelstvo togo chto priony mogut peredavatsya s poluchaemym iz mochi chelovecheskim menopauzalnym gonadotropinom primenyaemym dlya lecheniya besplodiya Sterilizaciya Razmnozhenie infekcionnyh agentov soderzhashih nukleinovye kisloty zavisit ot nukleinovyh kislot Odnako priony uvelichivayut svoyu chislennost izmenyaya strukturu normalnoj formy belka na prionnuyu Poetomu sterilizaciya protiv prionov dolzhna vklyuchat ih denaturaciyu do sostoyaniya v kotorom by oni byli nesposobny izmenyat konfiguraciyu drugih belkov Priony v bolshinstve svoyom ustojchivy k proteazam vysokoj temperature radiacii i hraneniyu v formaline hotya eti mery i snizhayut ih infektivnost Effektivnaya dezinfekciya protiv prionov dolzhna vklyuchat gidroliz prionov ili povrezhdenie razrushenie ih tretichnoj struktury Eto mozhno dostich obrabotkoj hlornoj izvestyu gidroksidom natriya i silnokislymi moyushimi veshestvami Prebyvanie v techenie 18 minut pri temperature 134 C v germetichnom parovom avtoklave ne mozhet deaktivirovat priony Kak potencialnyj metod dlya deaktivacii i denaturacii prionov v nastoyashee vremya izuchaetsya ozonovaya sterilizaciya Renaturaciya polnostyu denaturirovannogo priona do infektivnogo sostoyaniya zafiksirovana ne byla odnako dlya chastichno denaturirovannyh prionov v nekotoryh iskusstvennyh usloviyah eto vozmozhno Priony i tyazhyolye metally Soglasno nedavnim issledovaniyam narushenie obmena tyazhyolyh metallov v mozge igraet vazhnuyu rol v nejrotoksichnosti svyazannoj s Sc hotya na osnove imeyushejsya poka informacii slozhno obyasnit mehanizm stoyashij za vsem etim Est gipotezy obyasnyayushie eto yavlenie tem chto PrPC igraet nekotoruyu rol v metabolizme metallov i ego narushenie iz za agregacii etogo belka v vide PrPSc v fibrilly vyzyvaet disbalans obmena tyazhyolyh metallov v mozge Soglasno drugoj tochke zreniya toksichnost PrPSc usilivaetsya iz za vklyucheniya v agregaty PrPC svyazannyh metallov chto privodit k obrazovaniyu kompleksov PrPSc s okislitelno vosstanovitelnoj aktivnostyu Fiziologicheskoe znachenie nekotoryh kompleksov C s metallami izvestno a znachenie drugih net Patologicheskoe dejstvie C svyazannyh metallov vklyuchaet inducirovannoe metallom okislitelnoe povrezhdenie i v nekotoryh sluchayah perehod PrPC v PrPSc podobnuyu formu Potencialnoe lechenie i diagnostika Blagodarya kompyuternomu modelirovaniyu uchyonym udalos najti soedineniya kotorye mogut byt lekarstvom protiv prionnyh zabolevanij Naprimer odno soedinenie mozhet svyazyvatsya s uglubleniem v C i stabilizirovat ego strukturu snizhaya kolichestvo vredonosnyh PrPSc Nedavno byli opisany antitela k prionam sposobnye prohodit cherez gematoencefalicheskij barer i dejstvuyushie na citozolnye priony V poslednee desyatiletie XX veka byl dostignut nekotoryj progress v inaktivacii infektivnosti prionov v myase pri pomoshi sverhvysokogo davleniya V 2011 godu bylo otkryto chto priony mogut razlagatsya lishajnikami Bolshoe prakticheskoe znachenie imeet problema diagnostiki prionnyh zabolevanij v chastnosti gubchatoj encefalopatii krupnogo rogatogo skota i bolezni Krejtcfeldta Yakoba Ih inkubacionnyj period sostavlyaet ot mesyaca do desyatiletij v techenie kotoryh chelovek ne ispytyvaet nikakih simptomov dazhe esli process prevrasheniya normalnyh mozgovyh belkov PrPC v priony PrPSc uzhe nachalsya V nastoyashee vremya fakticheski net sposoba obnaruzhit Sc krome kak pri pomoshi proverki tkani mozga nejropatologicheskimi i immunogistohimicheskimi metodami uzhe posle smerti Harakternoj chertoj prionnyh zabolevanij yavlyaetsya nakoplenie prionnoj formy Sc belka PrP odnako v legko poluchaemyh zhidkostyah i tkanyah tela kak krov i mocha on soderzhitsya v ochen nizkih koncentraciyah Issledovateli pytalis razrabotat metod izmereniya doli PrPSc no sejchas po prezhnemu net polnostyu priznannyh metodov po ispolzovaniyu dlya etih celej takih materialov kak krov V 2010 godu gruppa issledovatelej iz Nyu Jorka opisala sposob obnaruzhit PrPSc dazhe togda kogda ego dolya v tkani mozga ravna odnoj na sto milliardov 10 11 Etot metod sochetaet amplifikaciyu s novoj tehnologiej nazyvaemoj Surround Optical Fiber Immunoassay angl opticheskij immunologicheskij analiz prilezhashih volokon i nekotorymi specificheskimi antitelami protiv PrPSc Posle amplifikacii s koncentrirovaniem vseh PrPSc vozmozhno soderzhashihsya v obrazce obrazec pomechaetsya fluorescentnym krasitelem s antitelami dlya specifichnosti i v konce zagruzhaetsya v mikrokapillyarnuyu trubku Potom eta trubka pomeshaetsya v specialnyj apparat tak chto ona okazyvaetsya polnostyu okruzhyonnoj opticheskimi voloknami i ves svet ispuskaemyj na trubku pogloshaetsya krasitelem predvaritelno vozbuzhdyonnym lazerom Eta tehnika pozvolyaet obnaruzhit PrPSc dazhe posle nebolshogo kolichestva ciklov perehoda v prionnuyu formu chto vo pervyh snizhaet vozmozhnost iskazheniya rezultata artefaktami eksperimenta i vo vtoryh uskoryaet hod procedury Issledovateli proveryali po etoj tehnike krov kazhushihsya zdorovymi ovec v dejstvitelnosti zarazhyonnyh skrepi Kogda bolezn stala ochevidnoj byl issledovan i ih mozg Takim obrazom issledovateli poluchili vozmozhnost sravnit analizy krovi i mozgovoj tkani zhivotnyh s simptomami bolezni so skrytoj boleznyu i neinficirovannyh Rezultaty naglyadno pokazali chto vysheopisannaya tehnika pozvolyaet obnaruzhit Sc v organizme zadolgo do poyavleniya pervyh simptomov Antiprionnaya aktivnost byla obnaruzhena u astemizola Priony gribovOsnovnaya statya Formirovanie prionov PSI otmenyaet nakoplenie krasnogo pigmenta obrazuyushegosya v rezultate mutacii v gene snizu v rezultate chego kolonii drozhzhej stanovyatsya belymi sverhu Belki sposobnye k peredache ih konformacii po nasledstvu to est nemendelevskoj nasledstvennosti byli otkryty u drozhzhej Saccharomyces cerevisiae angl Reed Wickner v nachale 1990 h Iz za shodstva s prionami mlekopitayushih eti alternativnye nasleduemye konformacii belkov byli nazvany prionami drozhzhej Pozzhe priony byli otkryty i u griba Gruppa 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