A cell-surface receptor for lipocalin 24p3 selectively mediates apoptosis and iron uptake
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Document Type
Journal ArticlePublication Date
2005-12-27Keywords
Acute-Phase ProteinsAmino Acid Sequence
Animals
*Apoptosis
Cell Line
Hela Cells
Humans
Iron
Lipocalins
Mice
Molecular Sequence Data
Oncogene Proteins
Proto-Oncogene Proteins
Receptors, Cell Surface
Transfection
Genetics and Genomics
Metadata
Show full item recordAbstract
The lipocalin mouse 24p3 has been implicated in diverse physiological processes, including apoptosis due to interleukin-3 (IL-3) deprivation and iron transport. Here we report cloning of the 24p3 cell-surface receptor (24p3R). Ectopic 24p3R expression confers on cells the ability to undergo either iron uptake or apoptosis, dependent upon the iron content of the ligand: Iron-loaded 24p3 increases intracellular iron concentration without promoting apoptosis; iron-lacking 24p3 decreases intracellular iron levels, which induces expression of the proapoptotic protein Bim, resulting in apoptosis. Intracellular iron delivery blocks Bim induction and suppresses apoptosis due to 24p3 addition or IL-3 deprivation. We find, unexpectedly, that the BCR-ABL oncoprotein activates expression of 24p3 and represses 24p3R expression, rendering BCR-ABL(+) cells refractory to secreted 24p3. By inhibiting BCR-ABL, imatinib induces 24p3R expression and, consequently, apoptosis. Our results reveal an unanticipated role for intracellular iron regulation in an apoptotic pathway relevant to BCR-ABL-induced myeloproliferative disease and its treatment.Source
Cell. 2005 Dec 29;123(7):1293-305. Link to article on publisher's siteDOI
10.1016/j.cell.2005.10.027Permanent Link to this Item
http://hdl.handle.net/20.500.14038/43914PubMed ID
16377569Related Resources
Link to Article in PubMedae974a485f413a2113503eed53cd6c53
10.1016/j.cell.2005.10.027