Clin Cancer Res 2005, 11:4571–4579.PubMedCrossRef Selleck BIX 1294 35. Shivakumar L, Minna J, Sakamaki T, Pestell

R, White MA: The RASSF1A tumor suppressor blocks cell cycle progression and inhibits cyclin D1 accumulation. Mol Cell Biol 2002, 22:4309–4318.PubMedCrossRef Competing interests The authors declare that they have no competing interests. Authors’ contributions J.M. carried out the molecular genetic studies, participated in the sequence alignment and drafted the manuscript. P.S., Y.L.and Z.L. participated in preparation of animal model. H. W. was responsible for cell culture. X.P. and L.W. particiated in the immunohistochemistry. Y.G., J.G., and Z.L. participated in the design of the study and performed the statistical analysis. Z.J. conceived of the study, and participated in its design. All authors read and approved the final manuscript.”
“Background Iron is an essential element required for many biological processes from electron transport to ATP production

to heme and DNA synthesis with the bulk of the iron being in the hemoglobin of circulating red blood cells [1, 2]. Too little iron leads to a variety of pleiotropic effects from iron deficiency anemia to abnormal neurologic development, while too much iron may result in organ damage including hepatic cirrhosis and myocardiopathies. The system for the maintenance of iron homeostasis is complex. Approximately 1 mg of the iron utilized daily for the synthesis of nascent red blood cells is newly absorbed in the intestine selleck chemicals llc to replace the amount lost by shed epithelial cells and normal

blood loss. The remainder of the iron incorporated into newly synthesized hemoglobin is derived from macrophages from catabolized senescent red Bay 11-7085 blood cells. Hence, the uptake of iron for its final incorporation into hemoglobin or other ferriproteins requires 3 different transport pathways: intestinal iron absorption, iron release from macrophages, and iron uptake into erythroid precursors and other iron-requiring cells. In vertebrates, iron entry into the body occurs primarily in the duodenum, where Fe3+ is reduced to the more soluble Fe2+ by a ferrireductase (DcytB), which transports electrons from cytosolic NADPH to extracellular acceptors such as Fe3+ [3]. The Fe2+ is transported across the brush border LGX818 solubility dmso membrane (BBM) of duodenal enterocytes via the transmembrane protein, DMT1 (divalent metal transporter, also known as SLC11a2, DCT1, or Nramp2) [4, 5]. Subsequently, the internalized Fe2+ is transported across the basolateral membrane (BLM) by the transmembrane permease ferroportin (FPN1, also known as SLC40a1) [3, 6] in cooperation with the multicopper oxidase Hephaestin (Heph) [7, 8]. The exit of iron from macrophages onto plasma transferrin (Tf) is also mediated by the interaction of FPN1 and Heph [9].