Characterization of the cell surface receptor for granulocyte-macrophage colony-stimulating factor - PubMed (original) (raw)
. 1986 Mar 25;261(9):4177-83.
- PMID: 3005322
Free article
Characterization of the cell surface receptor for granulocyte-macrophage colony-stimulating factor
L S Park et al. J Biol Chem. 1986.
Free article
Abstract
125I-labeled recombinant murine granulocyte-macrophage colony-stimulating factor (GM-CSF) was used to characterize receptors specific for this lymphokine on the surface of cells of both myelomonocytic and T-cell origin. GM-CSF binding to these cells was specific and saturable. Equilibrium binding studies revealed that on all cell types examined, GM-CSF bound to a single class of high affinity receptor (1000-5000 receptors/cell) with a Ka of 10(8)-10(9) M-1. More extensive characterization with P388D1 cells showed that binding of GM-CSF was rapid at 37 degrees C with a slow subsequent dissociation rate. Among a panel of lymphokines and growth hormones, only unlabeled natural or recombinant GM-CSF were able to compete for the binding of 125I-GM-CSF to these cells. Affinity cross-linking experiments with the homobifunctional cross-linking reagents disuccinimidyl suberate, disuccinimidyl tartrate, and dithiobis(succinimidyl propionate) resulted in the identification of a receptor protein with a Mr of 130,000 on five out of the seven cell types examined. This protein was extremely sensitive to proteolysis and in the absence of protease inhibitors was degraded to a form with an approximate Mr of 70,000. A receptor protein of Mr 180,000, in addition to the Mr 70,000 protein, was found on bone marrow cells and on P815 cells. The potential tissue-specific molecular heterogeneity associated with the GM-CSF receptor may help to explain some of the diverse biological effects associated with this growth and differentiation factor.
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