Phaeochromocytoma PC12 cells treated with nerve growth factor (NGF) differentiate into a neuronal phenotype. Here we compare the uptake of transferrin-bound and non-transferrin-bound iron in NGF-treated (neuronal phenotype) and control (proliferating) PC12 cells. The non-transferrin-bound iron uptake was greater in the NGF-treated cells than in the control, independently of the uptake time, the iron-chelating agents used, the oxidation state of iron (Fe2+ or Fe3+) and the iron concentration tested. The NGF-treated cells expressed L-type and N-type voltage-operated Ca2+ channels. Nitrendipine (an L-type inhibitor) and possibly ω-conotoxin (an N-type inhibitor) inhibited the iron uptake by 20%. Thapsigargin inhibits the endoplasmic reticulum Ca2+ pump and allowed Mn2+ entry into cells. Preincubating PC12 cells with thapsigargin increased the iron uptake. The rate of transferrin-bound iron uptake was less than 1% of the non-transferrin-bound iron uptake and the maximum transferrin-bound iron uptake was also very low. We conclude that an increase in the iron uptake by multiple pathways accompanies the transition of PC12 cells from the proliferating to the neuronal phenotype.
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August 2001
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Research Article|
July 25 2001
Treatment of PC12 cells with nerve growth factor increases iron uptake
James MWANJEWE;
James MWANJEWE
Department of Medicine, McMaster University, 1200 Main Street West, Hamilton, Ontario, Canada L8N 3Z5
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Betsy King HUI;
Betsy King HUI
Department of Medicine, McMaster University, 1200 Main Street West, Hamilton, Ontario, Canada L8N 3Z5
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Michael D. COUGHLIN;
Michael D. COUGHLIN
Department of Medicine, McMaster University, 1200 Main Street West, Hamilton, Ontario, Canada L8N 3Z5
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Ashok K. GROVER
Ashok K. GROVER
1
Department of Medicine, McMaster University, 1200 Main Street West, Hamilton, Ontario, Canada L8N 3Z5
1To whom correspondence should be addressed (e-mail groverak@mcmaster.ca).
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Publisher: Portland Press Ltd
Received:
November 24 2000
Revision Received:
April 17 2001
Accepted:
May 30 2001
Online ISSN: 1470-8728
Print ISSN: 0264-6021
The Biochemical Society, London ©2001
2001
Biochem J (2001) 357 (3): 881–886.
Article history
Received:
November 24 2000
Revision Received:
April 17 2001
Accepted:
May 30 2001
Citation
James MWANJEWE, Betsy King HUI, Michael D. COUGHLIN, Ashok K. GROVER; Treatment of PC12 cells with nerve growth factor increases iron uptake. Biochem J 1 August 2001; 357 (3): 881–886. doi: https://doi.org/10.1042/bj3570881
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