Abstract
The ability of intestinal mucosa to absorb dietary ferric iron is attributed to the presence of a brush-border membrane reductase activity that displays adaptive responses to iron status. We have isolated a complementary DNA, Dcytb (for duodenal cytochrome b), which encoded a putative plasma membrane di-heme protein in mouse duodenal mucosa. Dcytb shared between 45 and 50% similarity to the cytochrome b561 family of plasma membrane reductases, was highly expressed in the brush-border membrane of duodenal enterocytes, and induced ferric reductase activity when expressed in Xenopus oocytes and cultured cells. Duodenal expression levels of Dcytb messenger RNA and protein were regulated by changes in physiological modulators of iron absorption. Thus, Dcytb provides an important element in the iron absorption pathway.
Publication types
- Research Support, Non-U.S. Gov't
MeSH terms
- Amino Acid Sequence
- Anemia / enzymology
- Animals
- Cell Line
- Cloning, Molecular
- Cytochrome b Group / chemistry
- Cytochrome b Group / genetics
- Cytochrome b Group / metabolism*
- DNA, Complementary
- Duodenum / enzymology
- Duodenum / metabolism*
- Enterocytes / enzymology
- Enterocytes / metabolism
- Enzyme Induction
- Ferric Compounds / metabolism*
- Hypoxia
- Intestinal Absorption*
- Intestinal Mucosa / enzymology
- Intestinal Mucosa / metabolism*
- Iron, Dietary / administration & dosage
- Iron, Dietary / metabolism*
- Male
- Mice
- Microvilli / enzymology
- Microvilli / metabolism
- Molecular Sequence Data
- Nitroblue Tetrazolium / metabolism
- Oocytes
- Oxidation-Reduction
- Oxidoreductases / chemistry
- Oxidoreductases / genetics
- Oxidoreductases / metabolism*
- RNA, Messenger / genetics
- RNA, Messenger / metabolism
- Tetrazolium Salts / metabolism
- Thiazoles / metabolism
- Transfection*
- Up-Regulation
- Xenopus
Substances
- Cytochrome b Group
- DNA, Complementary
- Ferric Compounds
- Iron, Dietary
- RNA, Messenger
- Tetrazolium Salts
- Thiazoles
- cytochrome b561
- Nitroblue Tetrazolium
- Oxidoreductases
- Cybrd1 protein, mouse
- thiazolyl blue