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. 1988 Nov;85(21):8062–8066. doi: 10.1073/pnas.85.21.8062

Identification and subcellular localization of proteins that are rapidly phosphorylated in tyrosine in response to colony-stimulating factor 1.

A Sengupta 1, W K Liu 1, Y G Yeung 1, D C Yeung 1, A R Frackelton Jr 1, E R Stanley 1
PMCID: PMC282354  PMID: 2460861

Abstract

To investigate growth factor-mediated signal transduction, we have studied phosphorylation events that take place within seconds of the binding of colony-stimulating factor 1 (CSF-1) to its cell-surface receptor. CSF-1 stimulated rapid tyrosine phosphorylation of cellular proteins in murine BAC1.2F5 macrophages at 37 degrees C and 4 degrees C. The pattern of CSF-1-stimulated tyrosine phosphorylation of at least 15 different proteins at both temperatures was similar and unchanged by treatment of the lysate with reducing agent. With the exception of the 185-kDa CSF-1 receptor, a 260-kDa protein and a 133-kDa protein, the proteins were predominantly cytoplasmic. At 37 degrees C, all the proteins were phosphorylated within 30 sec of addition of growth factor. At 4 degrees C, CSF-1 receptor sites were saturated after 2 min of incubation in the presence of high concentrations of CSF-1 and differences in the order of appearance of phosphorylated proteins were observed: 185 kDa (CSF-1 receptor) (by 2 min); 99 kDa (by 4 min); 125 kDa (by 10 min); 61 kDa (by 30 min); and 260 kDa, 84 kDa, and 41 kDa (by 180 min). In addition to stimulating the phosphorylation of these proteins in tyrosine, CSF-1 caused dephosphorylation of phosphorylated serine residues on the receptor. As neither CSF-1 nor its receptor is internalized at 4 degrees C, analysis of these early reactions and the phosphotyrosine-containing proteins in intact cells under these conditions should lead to an understanding of the early events in growth factor receptor-mediated signal transduction.

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Selected References

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