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L773:1388 1981
 

Sökning: L773:1388 1981 > Metabolism of 25-hy...

  • Araya, ZufanUppsala universitet,Institutionen för farmaceutisk biovetenskap,Pharm Biochemistry (författare)

Metabolism of 25-hydroxyvitamin D3 by microsomal and mitochondrial vitamin D3 25-hydroxylases (CYP2D25 and CYP27A1) : a novel reaction by CYP27A1

  • Artikel/kapitelEngelska2003

Förlag, utgivningsår, omfång ...

  • 2003
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:uu-64405
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-64405URI
  • https://doi.org/10.1016/S1388-1981(03)00062-3DOI
  • http://kipublications.ki.se/Default.aspx?queryparsed=id:19315123URI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • The metabolism of 25-hydroxyvitamin D(3) was studied with a crude mitochondrial cytochrome P450 extract from pig kidney and with recombinant human CYP27A1 (mitochondrial vitamin D(3) 25-hydroxylase) and porcine CYP2D25 (microsomal vitamin D(3) 25-hydroxylase). The kidney mitochondrial cytochrome P450 catalyzed the formation of 1alpha,25-dihydroxyvitamin D(3), 24,25-dihydroxyvitamin D(3) and 25,27-dihydroxyvitamin D(3). An additional metabolite that was separated from the other hydroxylated products on HPLC was also formed. The formation of this 25-hydroxyvitamin D(3) metabolite was dependent on NADPH and the mitochondrial electron transferring protein components. A monoclonal antibody directed against purified pig liver CYP27A1 immunoprecipitated the 1alpha- and 27-hydroxylase activities towards 25-hydroxyvitamin D(3) as well as the formation of the unknown metabolite. These results together with substrate inhibition experiments indicate that CYP27A1 is responsible for the formation of the unknown 25-hydroxyvitamin D(3) metabolite in kidney. Recombinant human CYP27A1 was found to convert 25-hydroxyvitamin D(3) into 1alpha,25-dihydroxyvitamin D(3), 25,27-dihydroxyvitamin D(3) and a major metabolite with the same retention time on HPLC as that formed by kidney mitochondrial cytochrome P450. Gas chromatography-mass spectrometry (GC-MS) analysis of the unknown enzymatic product revealed it to be a triol different from other known hydroxylated 25-hydroxyvitamin D(3) metabolites such as 1alpha,25-, 23,25-, 24,25-, 25,26- or 25,27-dihydroxyvitamin D(3). The product had the mass spectrometic properties expected for 4beta,25-dihydroxyvitamin D(3). Recombinant porcine CYP2D25 converted 25-hydroxyvitamin D(3) into 1alpha,25-dihydroxyvitamin D(3) and 25,26-dihydroxyvitamin D(3). It can be concluded that both CYP27A1 and CYP2D25 are able to carry out multiple hydroxylations of 25-hydroxyvitamin D(3).

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Hosseinpour, FardinUppsala universitet,Institutionen för farmaceutisk biovetenskap,Pharm Biochemistry (författare)
  • Bodin, Karl (författare)
  • Wikvall, KjellUppsala universitet,Institutionen för farmaceutisk biovetenskap,Pharm Biochemistry(Swepub:uu)kwi24506 (författare)
  • Uppsala universitetInstitutionen för farmaceutisk biovetenskap (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Biochimica et Biophysica Acta - Molecular and Cell Biology of Lipids1632:1-21-3, s. 40-471388-19811879-2618
  • Ingår i:Biochimica et biophysica acta1632:1-21-3, s. 40-470006-3002

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