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Human macrophage colony-stimulating factor (M-CSF) is a homodimeric cytokine that is a member of a structurally related family of hormones defined by an unusual up-up-down-down alpha-helical bundle. To identify regions on the surface of M-CSF that might interact with the M-CSF receptor, single and double amino acid substitutions were introduced into a truncated form of human M-CSF alpha by site...

Transcription of early growth response gene-1 (Egr-1) is required for macrophage differentiation. Since granulocyte-macrophage colony-stimulating factor (GM-CSF) induces macrophage proliferation as well as the transcription of Egr-1 mRNA, we characterized the induction of Egr-1 protein in murine peritoneal macrophages following treatment with GM-CSF. As determined by Western blot analysis, the ...