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I-NMNH, inoveli kunye nesandulela se-NAD esinamandla

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I-NMNH, inoveli kunye nesandulela se-NAD esinamandla

2024-08-27 10:00:38


I-Nicotinamide adenine dinucleotide (NAD) i-homeostasis iqhubeka ibeka esichengeni ngenxa yokuthotywa kwee-enzymes ezixhomekeke kwi-NAD. Ukuncedisa i-NAD kunye ne-NAD precursors i-nicotinamide mononucleotide (NMN) kunye ne-nicotinamide riboside (NR) inokunciphisa oku kungalingani. Abanye abaphandi bachaza indlela yokudibanisa yendlela encitshisiweyo ye-NMN,NMNH, kwaye ichonge le molekyuli njenge-precursor entsha ye-NAD okokuqala, kwaye yaqinisekisa ukuba i-NMNH isebenze ngakumbi kune-NMN kunye ne-NR ekunyuseni amanqanaba e-NAD kwaye inokunciphisa ubukhulu be-tubule ye-renal. Iiseli ze-epithelial zonakele kwaye ukulungiswa kwazo kukhawuleza. Iziphumo zapapashwa kwi-"FASEB Journal".

I-Enzymatic synthesis ye-NMNH: Umsebenzi ophezulu we-NAD pyrophosphatase ukusuka kwi-Escherichia coli (EcNADD) isetyenziselwa ukucanda i-NADH ibe yi-NMNH kunye ne-AMP.

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NMNHkwandisa ngokufanelekileyo umxholo we-NAD:
Ukuze kuqinisekiswe ukuba i-NMNH inokunyusa ngokufanelekileyo umxholo we-NAD, i-concentrations eyahlukeneyo ye-NMN kunye ne-NMNH yafakwa kwiiseli zesibindi ze-AML12 iigundane. Iziphumo zibonise ukuba kwinqanaba ngalinye, i-NMNH inyuse izinga le-NAD ngaphezu kwe-NMN. Ngexesha elifanayo, amanqanaba e-NAD anyuke kakhulu ngaphakathi kwemizuzu ye-15 usebenzisa i-NMNH njenge-precursor, ebonisa ukuba i-NMNH i-precursor ekhawulezayo kune-NMN; kwaye xa kuthelekiswa ne-NMN, i-NMNH yandisa amanqanaba e-NAD ngamaxesha e-1.3-2.4. Ukukwazi ukunyusa amanqanaba e-NAD ukusuka kumaxesha e-5.2 ukuya kumaxesha e-37 kubonisa ukuba i-NMNH iyi-precursor esebenzayo kakhulu ye-NAD synthesis.
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Ukuze uqhathanise imiphumo ye-NMNH kunye ne-NMN, abaphandi bafaka i-PBS kunye ne-250 mg / kg ye-NMN kunyeNMNHkwiimpuku ze-C57BL/6N, ngokulandelelanayo, emva koko zenze iisampulu zegazi ezilandelelanayo. Iziphumo zibonise ukuba i-NMNH yandisa kakhulu amanqanaba e-NAD egazini, ukuya kumlinganiselo omkhulu kune-NMN. I-NAD yalinganiswa kwizicubu eziqokelelweyo ngokusebenzisa indlela yomjikelezo we-enzyme. Iziphumo zibonise ukuba i-NMNH yandise amanqanaba e-NAD kwii-tissue ezahlukeneyo, kwaye umphumo wawuphezulu kune-NMN. Yayinempembelelo ecacileyo kwisibindi kunye nezintso, kunye nesibindi sanda ngamaxesha angaphezu kwama-5 kunye nezintso zanda ngamaxesha angaphezu kwama-5. 2 amaxesha.

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NMNHikhusela iiseli ze-renal tubular epithelial kumonakalo:
Ngaphakathi kwezintso, i-proximal tubular epithelial cells isengozini yokulimala kwe-ischemic kuba ichaphazela ngokuthe ngqo imetabolism yamandla kwaye ibeka uxinzelelo olubalulekileyo kwi-NAD metabolism kwi-epithelium. Ukungalingani kwiindlela ze-metabolic kunye nokunciphisa amandla okulungisa iinkqubo ze-epithelial ezonakalisiweyo zikhokelela kwisifo sezintso. Ngaba ukonyusa amanqanaba e-NAD ngokutofa i-NMNH yangaphandle ngokufanelekileyo ukubuyisela iiseli ezonakalisiweyo ze-epithelial? Ulawulo lwe-NMNH phantsi kweemeko ze-normoxic zonyuse umxholo we-NAD kwi-5-fold, ngelixa kwi-concentration efanayo, umphumo we-NMN wawuphantsi kakhulu kune-NMNH. Zombini ii-precursors ze-NAD zonyuse kakhulu umxholo we-NAD kwiiseli ze-renal tubular epithelial phantsi kweemeko ze-hypoxic, nangaphezulu kweemeko ze-normoxic. Imeko efanayo yabonwa kwi-hepatocytes ekhulisiwe, apho ulawulo lwe-NMNH luphinde lwabangela ukwanda kweemetabolites ezinxulumene ne-NAD ukuya kumlinganiselo omkhulu kune-NMN.
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I-NMNH yongezwa ngexesha lesigaba se-reoxygenation, kwaye ukubonakaliswa kwe-renal tubular marker yokulimala kwe-KIM-1 kwafunyanwa. I-Reoxygenation kwi-TEC ibangele ukunyuka okubukhali kwi-KIM-1 intetho, eyehla ngokukhawuleza emva konyango lwe-NMNH, ebonisa ukuba ulawuloNMNHinokunciphisa ngokufanelekileyo kunye nokunciphisa umonakalo kwiiseli ze-renal tubular epithelial ngexesha le-hypoxia kunye ne-reoxygenation.

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