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Differences in iron requirements by concanavalin A-treated and anti-CD3-treated murine splenic lymphocytes

Published online by Cambridge University Press:  09 March 2007

Solo R. Kuvibidila ,
Maria Velez ,
Lolie Yu ,
Raj P. Warrier  and
B. Surendra Baliga
Solo R. Kuvibidila*
Affiliation:
Louisiana State University, Department of Pediatrics, Divisions of Hematology/Oncology, 1542 Tulane Avenue, New Orleans, LA 70112, USA
Maria Velez
Affiliation:
Louisiana State University, Department of Pediatrics, Divisions of Hematology/Oncology, 1542 Tulane Avenue, New Orleans, LA 70112, USA
Lolie Yu
Affiliation:
Louisiana State University, Department of Pediatrics, Divisions of Hematology/Oncology, 1542 Tulane Avenue, New Orleans, LA 70112, USA
Raj P. Warrier
Affiliation:
Louisiana State University, Department of Pediatrics, Divisions of Hematology/Oncology, 1542 Tulane Avenue, New Orleans, LA 70112, USA
B. Surendra Baliga
Affiliation:
University of South Alabama College of Medicine, Department of Pediatrics, 2451 Fillingim Street, Mobile AL 36617, USA
*
*Corresponding author: Dr Solo R. Kuvibidila, fax +1 504 568 3078, email [email protected]
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Abstract

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Fe availability is critical for optimal lymphocyte proliferation; however, the minimum required levels are unknown. Such information is valuable when assessing in vitro immune responses in Fe-deficient subjects, because serum (Fe) added to the culture medium may replete lymphocytes. To address this issue, splenic lymphocytes obtained from seventeen 3-month-old C57BL/6 mice were incubated without and with 1 mg/l concanavalin A or 50 μg/l anti-CD3 antibody in media that contained between 0·113 and 9·74 μmol Fe/l. Fe was provided by either fetal calf serum (FCS, 0–100 ml/l), newborn calf serum (NBCS, 0–100 ml/l), or NBCS (10 ml/l) plus ferric ammonium citrate. As expected, the rate of DNA synthesis increased with Fe levels (P<0·01). Maximum DNA synthesis was obtained with 2·26 μmol Fe/l (50 ml FCS/l) for concanavalin A and 0·895 μmol/l (20 ml FCS/l) for anti-CD3-treated cells. In serum-free media (0·113 μmol Fe/l), the proliferative responses to concanavalin A were below the background, while they rose 5·5-fold in anti-CD3-treated cells (P<0·05). In apotransferrin-supplemented media (0·13 μmol Fe/l), the proliferative responses to concanavalin A and anti-CD3 antibody were 18·6 and 71 %, respectively, of that obtained with 4·66 μmol Fe/l (100 ml FCS/l). Interleukin 2 secretion also followed the same trend as lymphocyte proliferation. Since differences between both mitogens persisted after FCS was substituted with NBCS, we can rule out an effect on ribonucleotide reductase activity, or by other serum growth factors. We speculate an Fe effect at an early step of T-cell activation. Data suggest that the minimum Fe concentration required for lymphocyte proliferation varies with the mitogen.

Keywords

IronLymphocyte proliferationConcanavalin AAnti-C antibodyInterleukin 2
Type
Research Article
Information
British Journal of Nutrition , Volume 88 , Issue 1 , July 2002 , pp. 67 - 72
Copyright
Copyright © The Nutrition Society 2002

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