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NMNH, buku lakale komanso lotsogola lamphamvu la NAD

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NMNH, buku lakale komanso lotsogola lamphamvu la NAD

2024-08-27 10:00:38


Nicotinamide adenine dinucleotide (NAD) homeostasis imasokonezedwa mosalekeza chifukwa chakuwonongeka ndi ma enzyme omwe amadalira NAD. Kuonjezera NAD ndi NAD precursors nicotinamide mononucleotide (NMN) ndi nicotinamide riboside (NR) akhoza kuchepetsa kusamvana uku. Ofufuza ena adanenanso za kaphatikizidwe ka mtundu wocheperako wa NMN,NMNH, ndipo adazindikira kuti molekyuluyi ndi kalambulabwalo watsopano wa NAD kwa nthawi yoyamba, ndipo adatsimikizira kuti NMNH ndi yothandiza kwambiri kuposa NMN ndi NR pakuwonjezera milingo ya NAD ndipo imatha kuchepetsa kukula kwa aimpso. Maselo a epithelial amawonongeka ndipo kukonzanso kwawo kumapita patsogolo. Zotsatirazo zidasindikizidwa mu "The FASEB Journal".

Enzymatic synthesis ya NMNH: Kuchuluka kwa NAD pyrophosphatase kuchokera ku Escherichia coli (EcNADD) kumagwiritsidwa ntchito kuphatikizira NADH kukhala NMNH ndi AMP.

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NMNHkumawonjezera bwino za NAD:
Pofuna kutsimikizira ngati NMNH ingachulukitse bwino zinthu za NAD, machulukidwe osiyanasiyana a NMN ndi NMNH adabayidwa m'maselo a chiwindi a mbewa za AML12. Zotsatira zake zidawonetsa kuti pagulu lililonse, NMNH idakulitsa kuchuluka kwa NAD kuposa NMN. Panthawi imodzimodziyo, miyeso ya NAD inakula kwambiri mkati mwa mphindi za 15 pogwiritsa ntchito NMNH monga kalambulabwalo, kutsimikizira kuti NMNH ndi njira yofulumira kuposa NMN; ndipo poyerekeza ndi NMN, NMNH inawonjezera milingo ya NAD ndi nthawi za 1.3-2.4. Kutha kukulitsa milingo ya NAD kuchokera ku 5.2 nthawi mpaka nthawi za 37 kumatsimikizira kuti NMNH ndi kalambulabwalo kothandiza kwambiri kaphatikizidwe ka NAD.
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Pofuna kufananiza zotsatira za NMNH ndi NMN, ofufuzawo anabaya PBS ndi 250 mg/kg ya NMN ndiNMNHmu C57BL/6N mbewa, motsatana, kenako ndikuyesa magazi motsatizana. Zotsatirazo zinasonyeza kuti NMNH inachulukitsa kwambiri NAD m'magazi, mpaka kufika pamlingo waukulu kuposa NMN. NAD idayesedwa pamatenda osonkhanitsidwa kudzera munjira yozungulira ma enzyme. Zotsatira zinasonyeza kuti NMNH inawonjezera milingo ya NAD m'magulu osiyanasiyana, ndipo zotsatira zake zinali zapamwamba kuposa za NMN. Zinali ndi zotsatira zoonekeratu pa chiwindi ndi impso, ndi chiwindi chowonjezeka ndi maulendo oposa 5 ndipo impso zikuwonjezeka nthawi zoposa 5. 2 nthawi.

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NMNHimateteza ma cell a epithelial aimpso kuti asawonongeke:
Mkati mwa impso, ma proximal tubular epithelial cell amatha kuvulazidwa kwambiri ndi ischemic chifukwa amakhudza mwachindunji kagayidwe kazakudya ndipo amaika nkhawa kwambiri NAD metabolism mu epithelium. Kusalinganika kwa njira zama metabolic komanso kuchepa kwa kuthekera kokonzanso njira zowonongeka za epithelial kungayambitse matenda a impso. Kodi kukulitsa milingo ya NAD pobaya NMNH yakunja kungabwezeretse bwino maselo owonongeka a epithelial? Ulamuliro wa NMNH pansi pa zikhalidwe za normoxic unachulukitsa NAD zokhutira 5-fold, pamene panthawi yomweyi, zotsatira za NMN zinali zochepa kwambiri kuposa za NMNH. Ma precursors onse a NAD adachulukitsa kwambiri NAD m'maselo a epithelial aimpso pansi pamikhalidwe ya hypoxic, ngakhale pamwamba pa normoxic mikhalidwe. Zomwezo zinawoneka mu hepatocytes otukuka, kumene utsogoleri wa NMNH unachititsanso kuti ma metabolites okhudzana ndi NAD achuluke kwambiri kuposa NMN.
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NMNH idawonjezedwa panthawi ya reoxygenation, ndipo mawonekedwe a renal tubular injury marker KIM-1 adapezeka. Reoxygenation mu TEC inachititsa kuwonjezeka kwakukulu kwa mawu a KIM-1, omwe adatsika kwambiri pambuyo pa chithandizo cha NMNH, kusonyeza kuti kayendetsedwe ka mankhwalaNMNHamatha bwino komanso kuchepetsa kuwonongeka kwa maselo amtundu wa epithelial aimpso panthawi ya hypoxia ndi reoxygenation.

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