Human macrophage-colony stimulating factor: alternative RNA and protein processing from a single gene

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Updated: Aug 9, 2026

Using RNA-interference to Investigate the Innate Immune Response in Mouse Macrophages
12:47

Using RNA-interference to Investigate the Innate Immune Response in Mouse Macrophages

Published on: November 3, 2014

D P Cerretti1, J Wignall, D Anderson

  • 1Department of Molecular Biology, Immunex Corporation, Seattle, Washington 98101.

Molecular Immunology
|August 1, 1988
PubMed

Insights

This study identifies a third human Macrophage-colony stimulating factor (M-CSF) cDNA clone and demonstrates its biological activity. Surprisingly, M-CSF’s membrane-spanning region is not essential for activity but influences cell surface association.

Area of Science:

  • Molecular Biology
  • Hematopoiesis
  • Cell Signaling

Background:

  • Macrophage-colony stimulating factor (M-CSF) is crucial for macrophage development.
  • Previous research identified two human M-CSF cDNA clones.
  • The function of M-CSF variants and their domains requires further investigation.

Purpose of the Study:

  • To isolate and characterize a novel human M-CSF cDNA clone.
  • To investigate the biological activity and functional domains of M-CSF variants.
  • To explore the role of the M-CSF membrane-spanning region in protein activity and localization.

Main Methods:

  • Isolation and sequencing of a third human M-CSF cDNA clone and a genomic clone.
  • Transfection of COS-7 cells with M-CSF cDNA and genomic clones.
  • Assay of biological activity using murine and human bone marrow cell proliferation and colony formation.
  • Analysis of M-CSF protein subunits and the effect of the membrane-spanning region.

Main Results:

  • A third human M-CSF cDNA encoding a 438 amino acid protein was isolated.
  • Transfected cells expressed biologically active M-CSF, stimulating murine and human myeloid cell growth.
  • Recombinant human M-CSF did not induce proliferation of human bone marrow cells.
  • The membrane-spanning region was not essential for M-CSF activity but mediated cell surface association.

Conclusions:

  • Multiple human M-CSF isoforms can be generated from different cDNA clones.
  • The M-CSF membrane-spanning region plays a role in protein localization rather than essential biological activity.
  • Further research is needed to understand the differential effects of M-CSF on human versus murine cells.

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