Kufotokoza buluu wa methylene, Nrf2, ndi kupangidwa kwa mitokondriya yatsopano

Chiganizo chimodzi chimapezeka kawirikawiri m'malemba onena za buluu wa methylene: amayambitsa Nrf2 ndipo amapanga mitokondriya yatsopano. Chiganizochi chimamveka ngati mfundo imodzi, koma chili ndi malingaliro awiri osiyana, ofufuzidwa m'machitidwe osiyanasiyana ndiponso okhala ndi mitundu yosiyanasiyana ya umboni. Loyamba ndi njira yotumizira zizindikiro, yodziwira kusintha n'kuyambitsa majini oteteza. Lachiwiri ndi dongosolo lomanga, pamene selo likupanga zida zambiri za mitokondriya. Chizindikiro chingayambitse kumanga, koma kusonyeza kuti chizindikiro chinayamba si chimodzimodzi ndi kusonyeza kuti nyumba inamangidwa, ndipo kusonyeza kuti zipangizo zomangira zawonjezeka si chimodzimodzi ndi kusonyeza kuti mphamvu zikuperekedwa bwino. Nkhaniyi imasiyanitsa zinthu zitatuzi.

Lingaliro la Nrf2: chodziwira kusintha, osati chishango

Nrf2 (nuclear factor erythroid 2-related factor 2) ndi puloteni yolamulira kulembedwa kwa majini, yomwe ntchito yake ndi kuyambitsa majini. Pamene selo silikukumana ndi zinthu zolisokoneza, Nrf2 imasungidwa mu saitopulazimu ndi puloteni yodziwira kusintha yotchedwa Keap1, yomwe imaipereka ku zida za selo zotayira zinthu kuti iziwonongedwa mosalekeza. Zinthu zoyambitsa oxidation kapena zokopa maelekitironi zikasintha ma cysteine a pa Keap1 omwe amatha kuchita nawo ma reaction, kuwonongedwa kumeneko kumasiya. Nrf2 yopangidwa kumene imachuluka, imalowa mu nyukiliyasi, imagwirizana ndi mapuloteni ang'onoang'ono a Maf, ndipo imamangirira ku zigawo za DNA zotchedwa antioxidant response elements. Kumangirira kumeneko kumayambitsa gulu la majini oteteza.

Zizindikiro zomwe zimagwiritsidwa ntchito kwambiri poyezera njirayi ndi zenizeni. NQO1 (NAD(P)H quinone dehydrogenase 1) ndi TrxR1 (thioredoxin reductase 1) ndi ena mwa majini omwe Nrf2 imalunjika omwe amapereka umboni wodalirika kwambiri. HO-1 (heme oxygenase-1) imatha kulimbikitsidwa kwambiri, koma imalamulidwanso ndi zinthu zina. Ma enzyme monga SOD ndi catalase ndi zida zolimbana ndi oxidation, koma kuchuluka kwawo kumalamulidwa ndi mapuloteni ambiri olamulira kulembedwa kwa majini, choncho kuwonjezeka kwa SOD kokha sikutsimikizira kuti Nrf2 ndi yomwe inayambitsa zimenezo. Umboni woyandikira kwambiri ndi kuchuluka kwa Nrf2 mu nyukiliyasi, kuyambitsidwa kwa choyezera cha ARE, kapena kulimbikitsidwa kwa majini odziwika omwe Nrf2 imalunjika, komwe kumatha Nrf2 ikachotsedwa. Zina zonse, monga kuchepa kwa zinthu zoyambitsa oxidation, kupulumuka bwino pakakhala zovuta, kapena kuchuluka kwa glutathione, ndi zotsatira zapambuyo zomwe zingapangidwe ndi njira zambiri.

Zotsatira zoyambirira za buluu wa methylene m'nkhaniyi zili pafupi ndi mbali imeneyo ya umboni. Maselo a fibroblast omwe anaikidwa pa buluu wa methylene wa kuchuluka kwa nanomolar anasonyeza kuchedwa kwa kukalamba kwa maselo, limodzi ndi kuwonjezeka kwa complex IV, kugwiritsa ntchito mpweya wa oxygen kwambiri, ndi kulimbikitsidwa kwa ma enzyme a phase-2, TrxR1 ndi NQO1, monga mmene zinafotokozedwera mu kafukufuku woyamba kugwirizanitsa buluu wa methylene ndi kulimbikitsidwa kwa mitokondriya komanso kuchedwa kwa kukalamba kwa maselo. TrxR1 ndi NQO1 ndi majini enieni odziwika omwe Nrf2 imalunjika, omwe wowerenga mosamala amafuna kuona. Chimene kafukufukuyu sanasonyeze ndi kuyambitsidwa kwa chizindikirocho: panalibe kuyeza Nrf2 mu nyukiliyasi, choyezera cha ARE, kapena mayeso oyerekezera pogwiritsa ntchito maselo omwe Nrf2 inachotsedwamo. Choncho kumasulira moona mtima ndi kwakuti buluu wa methylene amalimbikitsa majini odziwika omwe Nrf2 imalunjika m'machitidwe amenewa. Izi zikugwirizana ndi kuyambitsidwa kwa Nrf2, koma sizikusiyanitsa Nrf2 kuti ioneke ngati ndiyo inayambitsa zotsatirazo. Kulimbikitsidwa kwa jini yomwe imalunjikidwa ndi sitepe imodzi pambuyo pa kuyatsa choyambitsacho.

Lingaliro la kupangidwa kwa mitokondriya: dongosolo lokhala ndi malo atatu oyendera

Kupangidwa kwa mitokondriya yatsopano ndi dongosolo limene selo limagwiritsa ntchito powonjezera mphamvu yogwirira ntchito ya mitokondriya. Motsatira mmene mabuku ophunzirira amafotokozera, dongosololi limadutsa m'malo atatu oyendera. Choyamba, puloteni yothandiza kuyambitsa majini, PGC-1alpha, imayambitsa dongosololi. Chachiwiri, mapuloteni a mu nyukiliyasi olamulira kulembedwa kwa majini amalimbikitsa kugwira ntchito kwa majini a mitokondriya, kuphatikizapo TFAM, yomwe imasamalira ndi kukopera DNA ya mitokondriya. Chosokoneza n'chakuti imodzi mwa mapuloteni olamulirawa imatchedwa NRF1, nuclear respiratory factor 1, yomwe ndi puloteni yosiyana ndi Nrf2. Chachitatu, selolo limakhala ndi ma genome ambiri a mitokondriya komanso zida zambiri zopangira mphamvu pogwiritsa ntchito mpweya wa oxygen. Zimenezi zingayesedwe mwa kuwerengera makope a mtDNA, kuyeza ntchito ya citrate synthase, kapena kuyeza kuchuluka ndi ntchito ya magulu a mapuloteni opangira mphamvu.

Malo aliwonse oyendera amapereka mfundo yamphamvu kapena yofooka kuposa yapitayo. Kuchuluka kwa RNA yotumiza uthenga ya PGC-1alpha kapena TFAM kumasonyeza kuti dongosololi lapemphedwa kuyamba, osati kuti lamalizidwa. Kuchuluka kwa mtDNA kapena puloteni ya complex IV kumasonyeza kuti zipangizo zawonjezeka, koma mitokondriya yokonzedwanso ingasonyezenso zimenezi. Kupanga mphamvu bwino, kugwiritsa ntchito mpweya wa oxygen kwambiri, kapena kuwonjezeka kwa ntchito ya magulu a mapuloteni kumasonyeza kuti ntchito yasintha, koma ntchito ingakhale bwino popanda mitokondriya yatsopano iliyonse. Mfundo yamphamvu yoti mitokondriya yatsopano yapangidwa imaphatikiza zinthu zonse zitatu: cholamulira, kuchuluka kwa zipangizo, ndi ntchito.

Kafukufuku wotsatira wa maselo a fibroblast anatsatira mbali yaikulu ya mndandanda umenewo. M'maselo a anthu a IMR90 omwe anapatsidwa buluu wa methylene wa 100 nanomolar, chiŵerengero cha NAD poyerekeza ndi NADH chinakwera kwakanthawi mkati mwa 15 mphindi ndipo chinabwerera pamlingo woyambirira mkati mwa tsiku limodzi. Chizindikiro chanthawi yochepa cha mphamvu chimenecho chinatsatiridwa ndi kuikidwa kwa phosphate kwakanthawi pa AMPK, puloteni yodziwira mmene mphamvu zilili, kenako kulimbikitsidwa kwa PGC-1alpha ndi SURF1, puloteni yofunikira kuti complex IV yogwira ntchito ilumikizidwe. Ntchito ya complex IV inawonjezeka pafupifupi kuwirikiza kawiri, zinthu zoyambitsa oxidation m'maselo zinachepa pafupifupi 28 peresenti, ndipo ma telomere ankatha pang'onopang'ono. Mndandanda wonsewo wafotokozedwa mu pepala logwirizanitsa ntchito ya redox ya buluu wa methylene ndi AMPK komanso kupangidwa kwa mitokondriya yatsopano.

Mfundo ziwiri za m'pepalalo n'zofunika kuziganizira chifukwa ndi mtundu wa mfundo zomwe nthawi zambiri zimasiyidwa. Choyamba, mmene kuyambitsidwako kunachitikira kunali kofunika kwambiri kuposa kungokhalapo kwake: buluu wa methylene anayambitsa AMPK kwakanthawi, pamene mankhwala oyerekezera a AICAR anayambitsa AMPK mosalekeza. Choyambitsa cha kanthawi kochepacho chinachedwetsa kukalamba kwa maselo bwino pafupifupi kuwirikiza kasanu ndi katatu. Choncho mawu akuti "buluu wa methylene amayambitsa AMPK" sali okwanira; mfundo yeniyeni ndi yakuti amayambitsa AMPK kwakanthawi, ndipo kuyerekezera kumasonyeza kuti kuyambitsa mosalekeza sikuchita ntchito yomweyo. Chachiwiri, buluu wa methylene sanasinthe mkombero wa moyo wa selo, zomwe zimachotsa kufotokoza kwina kosavuta kwambiri: kuti maselo ankangogawikana pang'onopang'ono ndipo chifukwa cha zimenezo ankaoneka achichepere.

Mbali ya mbewa: khalidwe, ma genome, ndi choyambitsa chosiyana dala ndi zimene tingayembekezere

Ntchito ya maselo okulitsidwa m'malo a kafukufuku inapitirizidwa m'zinyama ndi gulu lofufuza mbewa za msinkhu wapakati. Pambuyo pa 60 masiku akupatsidwa buluu wa methylene kudzera pakamwa, mbewa zomwe zinapatsidwazo zinasunga bwino kupirira kwawo pochita zochita zathupi komanso khalidwe lofufuza malo, ndipo zinasonyeza khalidwe lochepa lofanana ndi nkhawa poyerekeza ndi mbewa zokalamba zomwe sizinapatsidwe. M'minofu ya ubongo, majini omwe kukalamba kunachepetsa kugwira ntchito kwawo, NRF1, TFAM, SOD2, ndi COX1, gawo la complex IV, anabwezeretsedwa kuti ayandikire milingo ya mbewa zazikulu zosakalamba, ndipo chiwerengero cha makope a mtDNA chinakwera. Zotsatira zimenezo, kuphatikiza khalidwe, cholamulira, ndi kuchuluka kwa ma genome, zafotokozedwa mu kafukufuku wa mbewa za msinkhu wapakati wokhudza buluu wa methylene ndi kupangidwa kwa mitokondriya yatsopano mu ubongo.

Choyambitsa chomwe ofufuzawo anaganiza ndicho mbali yosangalatsa, chifukwa chimasiyana ndi kufotokoza kosavuta kwakuti buluu wa methylene ndi chinthu cholimbana ndi oxidation. Mbewa zomwe zinapatsidwa zinasonyeza kupangidwa kochuluka kwa mitundu ya oxygen yomwe imachita ma reaction mosavuta mu mitokondriya ya ubongo, makamaka hydrogen peroxide. Lingaliro la olemba kafukufukuyo linali lakuti chizindikiro chochepa cha peroxide n'chimene chimayambitsa njira ya Nrf2, yomwe kenako imayendetsa dongosolo lopanga mitokondriya yatsopano. M'malingaliro amenewa, buluu wa methylene ndi chinthu cholimbikitsa oxidation pa sitepe yoyambitsa, ndipo ndi chinthu cholimbana ndi oxidation pa sitepe ya zotsatira. Akatswiri a mmene mankhwala amagwirira ntchito amatcha machitidwe amenewa hormesis, pamene vuto laling'ono limayambitsa chitetezo chachikulu kuposa vutolo. Sizinayesedwe mwachindunji ngati kuwonjezeka kwa peroxide kumeneko kumayambitsadi Nrf2; ndiko kulumikizana komwe akuganiza, osati kulumikizana koyezedwa.

Kafukufuku wina wogwirizana nawo, wochitidwa ndi gulu lomwelo, anayesa mwamphamvu mbali ya chitetezo cha lingaliro limenelo. Mu mitokondriya ya ubongo yolekanitsidwa, buluu wa methylene anawonjezera kupangidwa kwa hydrogen peroxide pa kuchuluka kotsika mpaka 50 nanomolar, koma kuchuluka kogwiritsidwa ntchito pochiza sikunawononge DNA ya mitokondriya m'njira yomwe ingadziwike ndi mayeso. Pa 100 micromolar kokha, komwe kunali kokwera kwambiri kuposa milingo yogwiritsidwa ntchito pochiza, ndi pamene zidutswa zina za mtDNA zinasonyeza kuwonongeka. Kuphatikiza utoto wa 20 micromolar ndi kuwala kofiira kunapanga singlet oxygen yomwe inawononga mtDNA m'madera ambiri. Imeneyi ndi ntchito yodziwika ya utotowu yoyambitsa ma reaction ukawunikiridwa, osati mmene umagwirira ntchito popanda kuwala. Kuupereka pasadakhale kunatetezanso mitokondriya ya m'munsi mwa ubongo wapakati kuti isawonongeke mtDNA chifukwa cha rotenone. Mmene zotsatira zimasinthira ndi kuchuluka koperekedwa komanso mayeso oyerekezera a kuwonongeka kwa DNA zafotokozedwa mwatsatanetsatane mu kafukufuku wa kupangidwa kwa peroxide ndi buluu wa methylene popanda kuwononga DNA.

Zoyezedwa ndi zongoganiziridwa: kuwerenga chithunzicho

Chithunzi cha njira chili pansichi chinajambulidwa pa nkhaniyi kuti chitsimikizire kusiyanitsa kumene nkhaniyi yakhala ikuchita. Mabokosi okhala ndi malire a mizere yosadukiza akuimira masitepe okhala ndi umboni wachindunji wa mayesero m'mabuku a kafukufuku wa buluu wa methylene: kuzungulira kwa redox komwe kumasintha NAD/NADH, kuikidwa kwa phosphate kwakanthawi pa AMPK, kulimbikitsidwa kwa PGC-1alpha ndi SURF1, kuwonjezeka kwa ntchito ya complex IV, kulimbikitsidwa kwa NQO1 ndi TrxR1, kubwezeretsedwa kwa kugwira ntchito kwa majini opanga mitokondriya yatsopano ndi chiwerengero cha makope a mtDNA mu ubongo wa mbewa, komanso kuwonjezeka kwa peroxide popanda kuwononga mtDNA pa kuchuluka koperekedwa pochiza. Mabokosi okhala ndi malire a mizere yodukiza akuimira kulumikizana komwe kukungoganiziridwa: Keap1 kudziwa chizindikiro cha peroxide, kuchuluka kwa Nrf2 mu nyukiliyasi kuyendetsa majini oteteza, ndi muvi wosonyeza kuti kuyambitsidwa kwa Nrf2 kumayambitsa dongosolo lopanga mitokondriya yatsopano. Masitepe a mizere yodukizawa ndi omveka, akugwirizana ndi deta, ndipo ndi chidziwitso chodziwika cha sayansi ya zamoyo m'mabuku ophunzirira. Komabe, m'mapepalawa sanayesedwe pogwiritsa ntchito mayeso oyerekezera monga kuyeza Nrf2 mu nyukiliyasi, zoyezera za ARE, ndi kuchotsa Nrf2, zomwe zikanawasintha kukhala mabokosi a mizere yosadukiza.

Zinthu zitatu zomwe zimasokonezedwa zimaonekera chithunzichi chikakhala patsogolo panu. Choyamba, NRF1 ndi Nrf2 ndi mapuloteni osiyana okhala ndi mayina pafupifupi ofanana; kafukufuku wa mbewa anayeza nuclear respiratory factor 1, cholamulira kupangidwa kwa mitokondriya yatsopano, osati puloteni yolamulira kulembedwa kwa majini olimbana ndi oxidation. Kuzisokoneza kumasandutsa chithunzi chonsecho kukhala mfundo imodzi. Chachiwiri, kugwira ntchito kwa majini ndi chiyambi cha nkhaniyi, osati mapeto ake; kubwezeretsedwa kwa mauthenga a TFAM kapena COX1 kumathandizira mfundo yakuti kupangidwa kwa mitokondriya yatsopano kwapemphedwa, pamene chiwerengero cha makope a mtDNA ndi ntchito ya complex IV ndi umboni wakuti pempholo lakwaniritsidwa. Chachitatu, zotsatira zolimbana ndi oxidation sizitsimikizira kuti njira ya Nrf2 ndiyo yagwiritsidwa ntchito; kuchepa kwa zinthu zoyambitsa oxidation ndi 28 peresenti m'maselo a fibroblast komanso kutetezedwa ku rotenone mu mbewa ndi zotsatira zenizeni zapambuyo, koma njira zingapo zimatha kubweretsa zotsatirazo.

Zimene zingasinthe bokosi la mizere yodukiza kukhala la mizere yosadukiza

Mayesero omwe akusowa ndi omwe amagwiritsidwa ntchito nthawi zonse. Kuyeza puloteni ya Nrf2 mu nyukiliyasi pambuyo popereka buluu wa methylene, pa nthawi zofanana ndi za chizindikiro cha AMPK cha kanthawi kochepa, kungayese ngati mbali ziwirizi zimayambadi pamodzi, monga mmene lingaliro la kuyambitsidwa pa nthawi imodzi limanenera. Choyezera choyendetsedwa ndi ARE chingatsimikizire ntchito ya kulembedwa kwa majini m'malo mongoiganizira kuchokera ku majini omwe akulunjikidwa. Kubwereza kuyeza zizindikiro za kupangidwa kwa mitokondriya yatsopano pamene Nrf2 yachepetsedwa kapena yachotsedwa kungayese mwachindunji muvi wosonyeza choyambitsa ndi zotsatira: ngati kulimbikitsidwa kwa complex IV ndi kuwonjezeka kwa mtDNA zikupitirirabe popanda Nrf2, kulumikizana komwe akuganizako n'kolakwika ndipo mbali ya AMPK yokha ndiyo ikubweretsa zotsatirazo. Pa mbali ya zinyama, kafukufuku wopereka mankhwalawo kwa nthawi yaitali pogwiritsa ntchito malo atatu omwewo oyendera, cholamulira, kuchuluka kwa zipangizo, ndi ntchito, ungayese ngati dongosololi limapitiriza kugwira ntchito kapena limasintha kuti lizolowere. Mpaka pamenepo, kuyambitsidwa pa nthawi imodzi kwa njira za mphamvu ndi chitetezo kumakhalabe monga mmene olemba ake anazitchulira: chinthu chomwe chingakhale chofunika kwambiri, osati njira yogwirira ntchito yotsimikiziridwa.

Owerenga omwe akuchokera ku nkhani zambiri za mmene mankhwalawa amagwirira ntchito angafune mfundo zina zowazungulira: mmene buluu wa methylene amasunthira maelekitironi mu mitokondriya, zinthu zina zomwe amachita pa mitokondriya ndi mphamvu za maselo, mmene zotsatira za kukalamba kwa maselo zikugwirizanirana ndi kafukufuku wa kukalamba, mmene mfundo za kupangidwa kwa mitokondriya yatsopano zikugwirizanirana ndi luso la kuganiza, komanso mbiri ya chitetezo yomwe imakhazikitsa malire a zokambirana zilizonse za kuchuluka koperekedwa. Chilichonse mwa zimenezi ndi lingaliro losiyana lokhala ndi umboni wake, ndipo chilichonse chiyenera kusiyanitsiridwa zoyezedwa ndi zongoganiziridwa mofanana ndi mmene nkhaniyi yachitira ndi Nrf2.