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Polyamine modulation of iron uptake in CHO cells
François Gaboriau1, Anne Kreder, Nicolas Clavreul
1Groupe de Recherche en Thérapeutique Anticancéreuse, CNRS FRE 2261, Faculté de Médecine, 35043 Rennes Cedex, France. francois.gaboriau@univ-rennes1.fr
Biochemical Pharmacology
|April 15, 2004
Summary
Naturally occurring polyamines like spermine and spermidine can actively transport iron into cells via the polyamine transport system (PTS). This process, dependent on the PTS, highlights a novel pathway for cellular iron uptake.
Area of Science:
- Cell Biology
- Biochemistry
- Molecular Biology
Background:
- Polyamines are essential for cell growth, similar to iron.
- Eukaryotic cells possess a specific polyamine transport system (PTS).
- Polyamines can chelate metal cations like iron (Fe) and copper (Cu).
Purpose of the Study:
- To investigate the role of polyamines and their transport system in iron uptake.
- To determine if polyamines facilitate cellular iron entry.
Main Methods:
- Treatment of Chinese Hamster Ovary (CHO) cells with polyamines (spermine, spermidine) and iron (Fe(III)).
- Utilizing a mutant CHO cell line (CHO-MG) lacking polyamine transport activity.
- Employing radiolabeled compounds (14C-polyamines, 55Fe(III)) to track uptake.
Main Results:
- Polyamines (spermine, spermidine) induced cytotoxicity in the presence of Fe(III), which was preventable by an iron chelator.
- Cytotoxicity and iron uptake modulation were absent in CHO-MG cells, indicating PTS dependence.
- Active uptake of polyamine-iron complexes via the PTS was demonstrated.
- Spermine was more effective than spermidine in iron transport, correlating with the number of amino groups.
Conclusions:
- The cell polyamine transport system (PTS) serves as a potential pathway for cellular iron entry.
- Polyamines like spermine and spermidine can act as transferrin-independent iron chelating vectors.
- The number of amino groups in polyamines influences their efficiency in iron co-transport.