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Cell Immunol. 1990 Oct 15;130(2):401-15.

Growth factor-dependent regulation of transferrin receptor in proliferating and quiescent macrophages.

Author information

1
Division of Radiation Oncology, Mallinckrodt Institute of Radiology, St. Louis, Missouri.

Abstract

Transferrin receptor (TfR) expression in a population of murine macrophages was investigated during the colony-stimulating factor-1 (CSF-1)-induced proliferation and quiescence. Depletion of CSF-1 from the culture medium of bone marrow cell-derived macrophages (BMM) resulted in a simultaneous decrease in the total (cell surface + intracellular) amount of TfR and complete cessation of proliferating activity [( 3H]thymidine incorporation). The addition of CSF-1 to quiescent BMM resulted in a bimodal increase in surface TfR activity. A rapid but transient twofold increase only on the cell surface due to changes in the cycling of TfR was followed by a steady increase of total cellular TfR due to de novo synthesis. A similar transient increase in surface TfR was also induced by another hemopoietic colony-stimulating factor, GM-CSF, which is mitogenic for BMM. IL-3, which did not stimulate the clonal growth of these cells, failed to modulate surface TfR. In contrast to its effect on the cycling rate of TfR in quiescent cells, CSF-1 had little effect on the TfR distribution on proliferating BMM as well as on the J774 cells (a macrophage-like tumor cell line) despite the latter expressing high levels of CSF-1 receptor. This study showed that (i) cell surface modulation by growth factor is a function of state of cellular proliferation, and (ii) rapid changes in the cell surface distribution of TfR result from changes in its cycling rates.

PMID:
2145079
DOI:
10.1016/0008-8749(90)90282-v
[Indexed for MEDLINE]

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