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NMNH, igitabo gishya kandi gikomeye NAD ibanziriza

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NMNH, igitabo gishya kandi gikomeye NAD ibanziriza

2024-08-27 10:00:38


Nikotinamide adenine dinucleotide (NAD) homeostasis ikomeje guhungabana kubera kwangirika kwimisemburo iterwa na NAD. Kuzuza NAD hamwe na NAD ibanziriza nicotinamide mononucleotide (NMN) na nicotinamide riboside (NR) birashobora kugabanya ubwo busumbane. Abashakashatsi bamwe batangaje uburyo bwo guhuza uburyo bwagabanijwe bwa NMN,NMNH, kandi yerekanye iyi molekile nkibibanziriza NAD ku nshuro yambere, kandi yemeza ko NMNH ikora neza kurusha NMN na NR mu kongera urwego rwa NAD kandi ishobora kugabanya ubunini bwimpyiko. Epithelia selile yangiritse kandi gusana byihuse. Ibisubizo byatangajwe muri "Ikinyamakuru FASEB".

Enzymatic synthesis ya NMNH: Igikorwa kinini cya NAD pyrophosphatase kuva Escherichia coli (EcNADD) ikoreshwa muguhuza NADH muri NMNH na AMP.

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NMNHbyongera neza NAD ibirimo:
Kugirango hamenyekane niba NMNH ishobora kongera neza NAD, ubushakashatsi butandukanye bwa NMN na NMNH bwatewe mu ngirangingo z'umwijima z'imbeba za AML12. Ibisubizo byerekanaga ko kuri buri kwibandaho, NMNH yongereye urwego rwa NAD hejuru ya NMN. Muri icyo gihe, urwego rwa NAD rwiyongereye cyane mu minota 15 ukoresheje NMNH nkibibanziriza, byerekana ko NMNH ari intangiriro yihuta kuruta NMN; ugereranije na NMN, NMNH yongereye urwego rwa NAD inshuro 1.3-2.4. Kubasha kongera urwego rwa NAD kuva inshuro 5.2 kugeza inshuro 37 byerekana ko NMNH ari intangiriro nziza ya synthesis ya NAD.
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Mu rwego rwo kugereranya ingaruka za NMNH na NMN, abashakashatsi bateye PBS na 250 mg / kg ya NMN naNMNHmu mbeba za C57BL / 6N, hanyuma zigakurikirana amaraso akurikirana. Ibisubizo byerekanye ko NMNH yongereye cyane urugero rwa NAD mu maraso, ku rugero runini kuruta NMN. NAD yapimwe ku ngingo zegeranijwe hakoreshejwe uburyo bwa enzyme cycle. Ibisubizo byerekanaga ko NMNH yongereye urwego rwa NAD mubice bitandukanye, kandi ingaruka zabaye nyinshi kurenza NMN. Byagize ingaruka zigaragara cyane ku mwijima no ku mpyiko, umwijima wiyongereyeho inshuro zirenga 5 naho impyiko ziyongera inshuro zirenga 5. Inshuro 2.

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NMNHirinda impyiko tubular epithelial selile kwangirika:
Mu mpyiko, ingirabuzimafatizo ya epithelial selile ishobora kwibasirwa cyane no gukomeretsa ischemic kuko igira ingaruka ku buryo butaziguye kandi ikanashyira ingufu kuri metabolism ya NAD muri epitelium. Ubusumbane mu nzira ya metabolike hamwe nubushobozi buke bwo gusana ibyangiritse byangiza biterwa nimpyiko. Kongera urwego rwa NAD mugutera inshinge NMNH zishobora kugarura neza selile yangiritse? Ubuyobozi bwa NMNH mubihe bisanzwe byongerewe NAD inshuro 5, mugihe mugihe kimwe, ingaruka za NMN zari hasi cyane ugereranije na NMNH. Byombi bibanziriza NAD byongereye cyane NAD mubice byimpyiko epithelial selile yimiterere ya hypoxic, ndetse no hejuru yubuzima busanzwe. Ibintu nkibi byagaragaye no muri hepatocytes yumuco, aho ubuyobozi bwa NMNH nabwo bwatumye habaho kwiyongera kwa metabolite ijyanye na NAD ku buryo burenze NMN.
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NMNH yongerewe mugihe cya reoxygenation, kandi hagaragaye ibimenyetso byerekana imvune yimpyiko KIM-1. Reoxygenation muri TEC yatumye ubwiyongere bukabije mu mvugo ya KIM-1, bwagabanutse cyane nyuma yo kuvurwa kwa NMNH, byerekana ko ubuyobozi bwaNMNHirashobora kugabanya neza kandi cyane kwangirika kwimpyiko zifata impyiko mugihe cya hypoxia na reoxygenation.

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