Enhanced activity of the plasma membrane oxidoreductase in circulating lymphocytes from insulin-dependent diabetes mellitus patients Academic Article uri icon


MeSH Major

  • Diabetes Mellitus, Type 1
  • Lymphocytes
  • NADH, NADPH Oxidoreductases


  • Circulating human lymphocytes contain a transmembrane oxidoreductase (PMOR) capable of reducing dichlorophenol indophenol (DCIP) by endogenous reductants, presumably NADH. Membranes from lymphocytes obtained from buffy coats contain a NADH DCIP reductase having a K(m) of about 1 microM and almost insensible to dicoumarol. The PMOR of lymphocytes from insulin-dependent diabetic patients is higher than that from age-matched controls and, in addition, has a dicoumarol-sensitive component, lacking in most controls, presumably due to membrane association of DT-diaphorase. The increase of PMOR in diabetes is likely due to overexpression of the enzyme, in view of the very low K(m) for NADH indicating that, in intact cells, the enzyme is practically saturated with the reductant substrate.

publication date

  • July 6, 2002



  • Academic Article



  • eng

Digital Object Identifier (DOI)

  • 10.1006/bbrc.2002.6392

PubMed ID

  • 11820804

Additional Document Info

start page

  • 1589

end page

  • 92


  • 290


  • 5